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);    /* just in case you needed a useless field... */
1037         READ32(readdir->rd_maxcount);
1038         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1039                 goto out;
1040
1041         DECODE_TAIL;
1042 }
1043
1044 static __be32
1045 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1046 {
1047         DECODE_HEAD;
1048
1049         READ_BUF(4);
1050         READ32(remove->rm_namelen);
1051         READ_BUF(remove->rm_namelen);
1052         SAVEMEM(remove->rm_name, remove->rm_namelen);
1053         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1054                 return status;
1055
1056         DECODE_TAIL;
1057 }
1058
1059 static __be32
1060 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1061 {
1062         DECODE_HEAD;
1063
1064         READ_BUF(4);
1065         READ32(rename->rn_snamelen);
1066         READ_BUF(rename->rn_snamelen + 4);
1067         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1068         READ32(rename->rn_tnamelen);
1069         READ_BUF(rename->rn_tnamelen);
1070         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1071         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1072                 return status;
1073         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1074                 return status;
1075
1076         DECODE_TAIL;
1077 }
1078
1079 static __be32
1080 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1081 {
1082         DECODE_HEAD;
1083
1084         if (argp->minorversion >= 1)
1085                 return nfserr_notsupp;
1086
1087         READ_BUF(sizeof(clientid_t));
1088         COPYMEM(clientid, sizeof(clientid_t));
1089
1090         DECODE_TAIL;
1091 }
1092
1093 static __be32
1094 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1095                      struct nfsd4_secinfo *secinfo)
1096 {
1097         DECODE_HEAD;
1098
1099         READ_BUF(4);
1100         READ32(secinfo->si_namelen);
1101         READ_BUF(secinfo->si_namelen);
1102         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1103         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1104         if (status)
1105                 return status;
1106         DECODE_TAIL;
1107 }
1108
1109 static __be32
1110 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1111                      struct nfsd4_secinfo_no_name *sin)
1112 {
1113         DECODE_HEAD;
1114
1115         READ_BUF(4);
1116         READ32(sin->sin_style);
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1122 {
1123         __be32 status;
1124
1125         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1126         if (status)
1127                 return status;
1128         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1129                                   &setattr->sa_acl, &setattr->sa_label);
1130 }
1131
1132 static __be32
1133 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1134 {
1135         DECODE_HEAD;
1136
1137         if (argp->minorversion >= 1)
1138                 return nfserr_notsupp;
1139
1140         READ_BUF(NFS4_VERIFIER_SIZE);
1141         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1142
1143         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1144         if (status)
1145                 return nfserr_bad_xdr;
1146         READ_BUF(8);
1147         READ32(setclientid->se_callback_prog);
1148         READ32(setclientid->se_callback_netid_len);
1149
1150         READ_BUF(setclientid->se_callback_netid_len + 4);
1151         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1152         READ32(setclientid->se_callback_addr_len);
1153
1154         READ_BUF(setclientid->se_callback_addr_len + 4);
1155         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1156         READ32(setclientid->se_callback_ident);
1157
1158         DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1163 {
1164         DECODE_HEAD;
1165
1166         if (argp->minorversion >= 1)
1167                 return nfserr_notsupp;
1168
1169         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1170         COPYMEM(&scd_c->sc_clientid, 8);
1171         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1172
1173         DECODE_TAIL;
1174 }
1175
1176 /* Also used for NVERIFY */
1177 static __be32
1178 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1179 {
1180         DECODE_HEAD;
1181
1182         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1183                 goto out;
1184
1185         /* For convenience's sake, we compare raw xdr'd attributes in
1186          * nfsd4_proc_verify */
1187
1188         READ_BUF(4);
1189         READ32(verify->ve_attrlen);
1190         READ_BUF(verify->ve_attrlen);
1191         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1192
1193         DECODE_TAIL;
1194 }
1195
1196 static __be32
1197 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1198 {
1199         int avail;
1200         int len;
1201         DECODE_HEAD;
1202
1203         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1204         if (status)
1205                 return status;
1206         READ_BUF(16);
1207         READ64(write->wr_offset);
1208         READ32(write->wr_stable_how);
1209         if (write->wr_stable_how > 2)
1210                 goto xdr_error;
1211         READ32(write->wr_buflen);
1212
1213         /* Sorry .. no magic macros for this.. *
1214          * READ_BUF(write->wr_buflen);
1215          * SAVEMEM(write->wr_buf, write->wr_buflen);
1216          */
1217         avail = (char*)argp->end - (char*)argp->p;
1218         if (avail + argp->pagelen < write->wr_buflen) {
1219                 dprintk("NFSD: xdr error (%s:%d)\n",
1220                                 __FILE__, __LINE__);
1221                 goto xdr_error;
1222         }
1223         write->wr_head.iov_base = p;
1224         write->wr_head.iov_len = avail;
1225         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 i;
1616
1617         READ_BUF(4);
1618         READ32(argp->taglen);
1619         READ_BUF(argp->taglen + 8);
1620         SAVEMEM(argp->tag, argp->taglen);
1621         READ32(argp->minorversion);
1622         READ32(argp->opcnt);
1623         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1624
1625         if (argp->taglen > NFSD4_MAX_TAGLEN)
1626                 goto xdr_error;
1627         if (argp->opcnt > 100)
1628                 goto xdr_error;
1629
1630         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1631                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1632                 if (!argp->ops) {
1633                         argp->ops = argp->iops;
1634                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1635                         goto xdr_error;
1636                 }
1637         }
1638
1639         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1640                 argp->opcnt = 0;
1641
1642         for (i = 0; i < argp->opcnt; i++) {
1643                 op = &argp->ops[i];
1644                 op->replay = NULL;
1645
1646                 READ_BUF(4);
1647                 READ32(op->opnum);
1648
1649                 if (nfsd4_opnum_in_range(argp, op))
1650                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1651                 else {
1652                         op->opnum = OP_ILLEGAL;
1653                         op->status = nfserr_op_illegal;
1654                 }
1655                 /*
1656                  * We'll try to cache the result in the DRC if any one
1657                  * op in the compound wants to be cached:
1658                  */
1659                 cachethis |= nfsd4_cache_this_op(op);
1660
1661                 max_reply += nfsd4_max_reply(argp->rqstp, op);
1662
1663                 if (op->status) {
1664                         argp->opcnt = i+1;
1665                         break;
1666                 }
1667         }
1668         /* Sessions make the DRC unnecessary: */
1669         if (argp->minorversion)
1670                 cachethis = false;
1671         svc_reserve(argp->rqstp, max_reply);
1672         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1673
1674         DECODE_TAIL;
1675 }
1676
1677 #define WRITE32(n)               *p++ = htonl(n)
1678 #define WRITE64(n)               do {                           \
1679         *p++ = htonl((u32)((n) >> 32));                         \
1680         *p++ = htonl((u32)(n));                                 \
1681 } while (0)
1682 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1683         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1684         memcpy(p, ptr, nbytes);                                 \
1685         p += XDR_QUADLEN(nbytes);                               \
1686 }} while (0)
1687
1688 static void write32(__be32 **p, u32 n)
1689 {
1690         *(*p)++ = htonl(n);
1691 }
1692
1693 static void write64(__be32 **p, u64 n)
1694 {
1695         write32(p, (n >> 32));
1696         write32(p, (u32)n);
1697 }
1698
1699 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1700 {
1701         if (IS_I_VERSION(inode)) {
1702                 write64(p, inode->i_version);
1703         } else {
1704                 write32(p, stat->ctime.tv_sec);
1705                 write32(p, stat->ctime.tv_nsec);
1706         }
1707 }
1708
1709 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1710 {
1711         write32(p, c->atomic);
1712         if (c->change_supported) {
1713                 write64(p, c->before_change);
1714                 write64(p, c->after_change);
1715         } else {
1716                 write32(p, c->before_ctime_sec);
1717                 write32(p, c->before_ctime_nsec);
1718                 write32(p, c->after_ctime_sec);
1719                 write32(p, c->after_ctime_nsec);
1720         }
1721 }
1722
1723 /* Encode as an array of strings the string given with components
1724  * separated @sep, escaped with esc_enter and esc_exit.
1725  */
1726 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1727                                           char *components, char esc_enter,
1728                                           char esc_exit)
1729 {
1730         __be32 *p;
1731         __be32 pathlen;
1732         int pathlen_offset;
1733         int strlen, count=0;
1734         char *str, *end, *next;
1735
1736         dprintk("nfsd4_encode_components(%s)\n", components);
1737
1738         pathlen_offset = xdr->buf->len;
1739         p = xdr_reserve_space(xdr, 4);
1740         if (!p)
1741                 return nfserr_resource;
1742         p++; /* We will fill this in with @count later */
1743
1744         end = str = components;
1745         while (*end) {
1746                 bool found_esc = false;
1747
1748                 /* try to parse as esc_start, ..., esc_end, sep */
1749                 if (*str == esc_enter) {
1750                         for (; *end && (*end != esc_exit); end++)
1751                                 /* find esc_exit or end of string */;
1752                         next = end + 1;
1753                         if (*end && (!*next || *next == sep)) {
1754                                 str++;
1755                                 found_esc = true;
1756                         }
1757                 }
1758
1759                 if (!found_esc)
1760                         for (; *end && (*end != sep); end++)
1761                                 /* find sep or end of string */;
1762
1763                 strlen = end - str;
1764                 if (strlen) {
1765                         p = xdr_reserve_space(xdr, strlen + 4);
1766                         if (!p)
1767                                 return nfserr_resource;
1768                         WRITE32(strlen);
1769                         WRITEMEM(str, strlen);
1770                         count++;
1771                 }
1772                 else
1773                         end++;
1774                 str = end;
1775         }
1776         pathlen = htonl(xdr->buf->len - pathlen_offset);
1777         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1778         return 0;
1779 }
1780
1781 /* Encode as an array of strings the string given with components
1782  * separated @sep.
1783  */
1784 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1785                                       char *components)
1786 {
1787         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1788 }
1789
1790 /*
1791  * encode a location element of a fs_locations structure
1792  */
1793 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1794                                         struct nfsd4_fs_location *location)
1795 {
1796         __be32 status;
1797
1798         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1799                                                 '[', ']');
1800         if (status)
1801                 return status;
1802         status = nfsd4_encode_components(xdr, '/', location->path);
1803         if (status)
1804                 return status;
1805         return 0;
1806 }
1807
1808 /*
1809  * Encode a path in RFC3530 'pathname4' format
1810  */
1811 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1812                                 const struct path *root,
1813                                 const struct path *path)
1814 {
1815         struct path cur = *path;
1816         __be32 *p;
1817         struct dentry **components = NULL;
1818         unsigned int ncomponents = 0;
1819         __be32 err = nfserr_jukebox;
1820
1821         dprintk("nfsd4_encode_components(");
1822
1823         path_get(&cur);
1824         /* First walk the path up to the nfsd root, and store the
1825          * dentries/path components in an array.
1826          */
1827         for (;;) {
1828                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1829                         break;
1830                 if (cur.dentry == cur.mnt->mnt_root) {
1831                         if (follow_up(&cur))
1832                                 continue;
1833                         goto out_free;
1834                 }
1835                 if ((ncomponents & 15) == 0) {
1836                         struct dentry **new;
1837                         new = krealloc(components,
1838                                         sizeof(*new) * (ncomponents + 16),
1839                                         GFP_KERNEL);
1840                         if (!new)
1841                                 goto out_free;
1842                         components = new;
1843                 }
1844                 components[ncomponents++] = cur.dentry;
1845                 cur.dentry = dget_parent(cur.dentry);
1846         }
1847         err = nfserr_resource;
1848         p = xdr_reserve_space(xdr, 4);
1849         if (!p)
1850                 goto out_free;
1851         WRITE32(ncomponents);
1852
1853         while (ncomponents) {
1854                 struct dentry *dentry = components[ncomponents - 1];
1855                 unsigned int len;
1856
1857                 spin_lock(&dentry->d_lock);
1858                 len = dentry->d_name.len;
1859                 p = xdr_reserve_space(xdr, len + 4);
1860                 if (!p) {
1861                         spin_unlock(&dentry->d_lock);
1862                         goto out_free;
1863                 }
1864                 WRITE32(len);
1865                 WRITEMEM(dentry->d_name.name, len);
1866                 dprintk("/%s", dentry->d_name.name);
1867                 spin_unlock(&dentry->d_lock);
1868                 dput(dentry);
1869                 ncomponents--;
1870         }
1871
1872         err = 0;
1873 out_free:
1874         dprintk(")\n");
1875         while (ncomponents)
1876                 dput(components[--ncomponents]);
1877         kfree(components);
1878         path_put(&cur);
1879         return err;
1880 }
1881
1882 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1883                         struct svc_rqst *rqstp, const struct path *path)
1884 {
1885         struct svc_export *exp_ps;
1886         __be32 res;
1887
1888         exp_ps = rqst_find_fsidzero_export(rqstp);
1889         if (IS_ERR(exp_ps))
1890                 return nfserrno(PTR_ERR(exp_ps));
1891         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1892         exp_put(exp_ps);
1893         return res;
1894 }
1895
1896 /*
1897  *  encode a fs_locations structure
1898  */
1899 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1900                         struct svc_rqst *rqstp, struct svc_export *exp)
1901 {
1902         __be32 status;
1903         int i;
1904         __be32 *p;
1905         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1906
1907         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1908         if (status)
1909                 return status;
1910         p = xdr_reserve_space(xdr, 4);
1911         if (!p)
1912                 return nfserr_resource;
1913         WRITE32(fslocs->locations_count);
1914         for (i=0; i<fslocs->locations_count; i++) {
1915                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1916                 if (status)
1917                         return status;
1918         }
1919         return 0;
1920 }
1921
1922 static u32 nfs4_file_type(umode_t mode)
1923 {
1924         switch (mode & S_IFMT) {
1925         case S_IFIFO:   return NF4FIFO;
1926         case S_IFCHR:   return NF4CHR;
1927         case S_IFDIR:   return NF4DIR;
1928         case S_IFBLK:   return NF4BLK;
1929         case S_IFLNK:   return NF4LNK;
1930         case S_IFREG:   return NF4REG;
1931         case S_IFSOCK:  return NF4SOCK;
1932         default:        return NF4BAD;
1933         };
1934 }
1935
1936 static inline __be32
1937 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1938                      struct nfs4_ace *ace)
1939 {
1940         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1941                 return nfs4_acl_write_who(xdr, ace->whotype);
1942         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1943                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1944         else
1945                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1946 }
1947
1948 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1949                               FATTR4_WORD0_RDATTR_ERROR)
1950 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1951
1952 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1953 static inline __be32
1954 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1955                             void *context, int len)
1956 {
1957         __be32 *p;
1958
1959         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1960         if (!p)
1961                 return nfserr_resource;
1962
1963         /*
1964          * For now we use a 0 here to indicate the null translation; in
1965          * the future we may place a call to translation code here.
1966          */
1967         WRITE32(0); /* lfs */
1968         WRITE32(0); /* pi */
1969         p = xdr_encode_opaque(p, context, len);
1970         return 0;
1971 }
1972 #else
1973 static inline __be32
1974 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1975                             void *context, int len)
1976 { return 0; }
1977 #endif
1978
1979 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1980 {
1981         /* As per referral draft:  */
1982         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1983             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1984                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1985                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1986                         *rdattr_err = NFSERR_MOVED;
1987                 else
1988                         return nfserr_moved;
1989         }
1990         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1991         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1992         return 0;
1993 }
1994
1995
1996 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1997 {
1998         struct path path = exp->ex_path;
1999         int err;
2000
2001         path_get(&path);
2002         while (follow_up(&path)) {
2003                 if (path.dentry != path.mnt->mnt_root)
2004                         break;
2005         }
2006         err = vfs_getattr(&path, stat);
2007         path_put(&path);
2008         return err;
2009 }
2010
2011 /*
2012  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2013  * ourselves.
2014  */
2015 __be32
2016 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2017                 struct svc_export *exp,
2018                 struct dentry *dentry, u32 *bmval,
2019                 struct svc_rqst *rqstp, int ignore_crossmnt)
2020 {
2021         u32 bmval0 = bmval[0];
2022         u32 bmval1 = bmval[1];
2023         u32 bmval2 = bmval[2];
2024         struct kstat stat;
2025         struct svc_fh *tempfh = NULL;
2026         struct kstatfs statfs;
2027         __be32 *p;
2028         int starting_len = xdr->buf->len;
2029         int attrlen_offset;
2030         __be32 attrlen;
2031         u32 dummy;
2032         u64 dummy64;
2033         u32 rdattr_err = 0;
2034         __be32 status;
2035         int err;
2036         int aclsupport = 0;
2037         struct nfs4_acl *acl = NULL;
2038         void *context = NULL;
2039         int contextlen;
2040         bool contextsupport = false;
2041         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2042         u32 minorversion = resp->cstate.minorversion;
2043         struct path path = {
2044                 .mnt    = exp->ex_path.mnt,
2045                 .dentry = dentry,
2046         };
2047         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2048
2049         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2050         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2051         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2052         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2053
2054         if (exp->ex_fslocs.migrated) {
2055                 BUG_ON(bmval[2]);
2056                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2057                 if (status)
2058                         goto out;
2059         }
2060
2061         err = vfs_getattr(&path, &stat);
2062         if (err)
2063                 goto out_nfserr;
2064         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2065                         FATTR4_WORD0_MAXNAME)) ||
2066             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2067                        FATTR4_WORD1_SPACE_TOTAL))) {
2068                 err = vfs_statfs(&path, &statfs);
2069                 if (err)
2070                         goto out_nfserr;
2071         }
2072         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2073                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2074                 status = nfserr_jukebox;
2075                 if (!tempfh)
2076                         goto out;
2077                 fh_init(tempfh, NFS4_FHSIZE);
2078                 status = fh_compose(tempfh, exp, dentry, NULL);
2079                 if (status)
2080                         goto out;
2081                 fhp = tempfh;
2082         }
2083         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2084                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2085                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2086                 aclsupport = (err == 0);
2087                 if (bmval0 & FATTR4_WORD0_ACL) {
2088                         if (err == -EOPNOTSUPP)
2089                                 bmval0 &= ~FATTR4_WORD0_ACL;
2090                         else if (err == -EINVAL) {
2091                                 status = nfserr_attrnotsupp;
2092                                 goto out;
2093                         } else if (err != 0)
2094                                 goto out_nfserr;
2095                 }
2096         }
2097
2098 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2099         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2100                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2101                 err = security_inode_getsecctx(dentry->d_inode,
2102                                                 &context, &contextlen);
2103                 contextsupport = (err == 0);
2104                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2105                         if (err == -EOPNOTSUPP)
2106                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2107                         else if (err)
2108                                 goto out_nfserr;
2109                 }
2110         }
2111 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2112
2113         if (bmval2) {
2114                 p = xdr_reserve_space(xdr, 16);
2115                 if (!p)
2116                         goto out_resource;
2117                 WRITE32(3);
2118                 WRITE32(bmval0);
2119                 WRITE32(bmval1);
2120                 WRITE32(bmval2);
2121         } else if (bmval1) {
2122                 p = xdr_reserve_space(xdr, 12);
2123                 if (!p)
2124                         goto out_resource;
2125                 WRITE32(2);
2126                 WRITE32(bmval0);
2127                 WRITE32(bmval1);
2128         } else {
2129                 p = xdr_reserve_space(xdr, 8);
2130                 if (!p)
2131                         goto out_resource;
2132                 WRITE32(1);
2133                 WRITE32(bmval0);
2134         }
2135
2136         attrlen_offset = xdr->buf->len;
2137         p = xdr_reserve_space(xdr, 4);
2138         if (!p)
2139                 goto out_resource;
2140         p++;                /* to be backfilled later */
2141
2142         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2143                 u32 word0 = nfsd_suppattrs0(minorversion);
2144                 u32 word1 = nfsd_suppattrs1(minorversion);
2145                 u32 word2 = nfsd_suppattrs2(minorversion);
2146
2147                 if (!aclsupport)
2148                         word0 &= ~FATTR4_WORD0_ACL;
2149                 if (!contextsupport)
2150                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2151                 if (!word2) {
2152                         p = xdr_reserve_space(xdr, 12);
2153                         if (!p)
2154                                 goto out_resource;
2155                         WRITE32(2);
2156                         WRITE32(word0);
2157                         WRITE32(word1);
2158                 } else {
2159                         p = xdr_reserve_space(xdr, 16);
2160                         if (!p)
2161                                 goto out_resource;
2162                         WRITE32(3);
2163                         WRITE32(word0);
2164                         WRITE32(word1);
2165                         WRITE32(word2);
2166                 }
2167         }
2168         if (bmval0 & FATTR4_WORD0_TYPE) {
2169                 p = xdr_reserve_space(xdr, 4);
2170                 if (!p)
2171                         goto out_resource;
2172                 dummy = nfs4_file_type(stat.mode);
2173                 if (dummy == NF4BAD) {
2174                         status = nfserr_serverfault;
2175                         goto out;
2176                 }
2177                 WRITE32(dummy);
2178         }
2179         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2180                 p = xdr_reserve_space(xdr, 4);
2181                 if (!p)
2182                         goto out_resource;
2183                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2184                         WRITE32(NFS4_FH_PERSISTENT);
2185                 else
2186                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2187         }
2188         if (bmval0 & FATTR4_WORD0_CHANGE) {
2189                 p = xdr_reserve_space(xdr, 8);
2190                 if (!p)
2191                         goto out_resource;
2192                 write_change(&p, &stat, dentry->d_inode);
2193         }
2194         if (bmval0 & FATTR4_WORD0_SIZE) {
2195                 p = xdr_reserve_space(xdr, 8);
2196                 if (!p)
2197                         goto out_resource;
2198                 WRITE64(stat.size);
2199         }
2200         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2201                 p = xdr_reserve_space(xdr, 4);
2202                 if (!p)
2203                         goto out_resource;
2204                 WRITE32(1);
2205         }
2206         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2207                 p = xdr_reserve_space(xdr, 4);
2208                 if (!p)
2209                         goto out_resource;
2210                 WRITE32(1);
2211         }
2212         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2213                 p = xdr_reserve_space(xdr, 4);
2214                 if (!p)
2215                         goto out_resource;
2216                 WRITE32(0);
2217         }
2218         if (bmval0 & FATTR4_WORD0_FSID) {
2219                 p = xdr_reserve_space(xdr, 16);
2220                 if (!p)
2221                         goto out_resource;
2222                 if (exp->ex_fslocs.migrated) {
2223                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2224                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2225                 } else switch(fsid_source(fhp)) {
2226                 case FSIDSOURCE_FSID:
2227                         WRITE64((u64)exp->ex_fsid);
2228                         WRITE64((u64)0);
2229                         break;
2230                 case FSIDSOURCE_DEV:
2231                         WRITE32(0);
2232                         WRITE32(MAJOR(stat.dev));
2233                         WRITE32(0);
2234                         WRITE32(MINOR(stat.dev));
2235                         break;
2236                 case FSIDSOURCE_UUID:
2237                         WRITEMEM(exp->ex_uuid, 16);
2238                         break;
2239                 }
2240         }
2241         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2242                 p = xdr_reserve_space(xdr, 4);
2243                 if (!p)
2244                         goto out_resource;
2245                 WRITE32(0);
2246         }
2247         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2248                 p = xdr_reserve_space(xdr, 4);
2249                 if (!p)
2250                         goto out_resource;
2251                 WRITE32(nn->nfsd4_lease);
2252         }
2253         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2254                 p = xdr_reserve_space(xdr, 4);
2255                 if (!p)
2256                         goto out_resource;
2257                 WRITE32(rdattr_err);
2258         }
2259         if (bmval0 & FATTR4_WORD0_ACL) {
2260                 struct nfs4_ace *ace;
2261
2262                 if (acl == NULL) {
2263                         p = xdr_reserve_space(xdr, 4);
2264                         if (!p)
2265                                 goto out_resource;
2266
2267                         WRITE32(0);
2268                         goto out_acl;
2269                 }
2270                 p = xdr_reserve_space(xdr, 4);
2271                 if (!p)
2272                         goto out_resource;
2273                 WRITE32(acl->naces);
2274
2275                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2276                         p = xdr_reserve_space(xdr, 4*3);
2277                         if (!p)
2278                                 goto out_resource;
2279                         WRITE32(ace->type);
2280                         WRITE32(ace->flag);
2281                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2282                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2283                         if (status)
2284                                 goto out;
2285                 }
2286         }
2287 out_acl:
2288         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2289                 p = xdr_reserve_space(xdr, 4);
2290                 if (!p)
2291                         goto out_resource;
2292                 WRITE32(aclsupport ?
2293                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2294         }
2295         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2296                 p = xdr_reserve_space(xdr, 4);
2297                 if (!p)
2298                         goto out_resource;
2299                 WRITE32(1);
2300         }
2301         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2302                 p = xdr_reserve_space(xdr, 4);
2303                 if (!p)
2304                         goto out_resource;
2305                 WRITE32(0);
2306         }
2307         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2308                 p = xdr_reserve_space(xdr, 4);
2309                 if (!p)
2310                         goto out_resource;
2311                 WRITE32(1);
2312         }
2313         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2314                 p = xdr_reserve_space(xdr, 4);
2315                 if (!p)
2316                         goto out_resource;
2317                 WRITE32(1);
2318         }
2319         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2320                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2321                 if (!p)
2322                         goto out_resource;
2323                 WRITE32(fhp->fh_handle.fh_size);
2324                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2325         }
2326         if (bmval0 & FATTR4_WORD0_FILEID) {
2327                 p = xdr_reserve_space(xdr, 8);
2328                 if (!p)
2329                         goto out_resource;
2330                 WRITE64(stat.ino);
2331         }
2332         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2333                 p = xdr_reserve_space(xdr, 8);
2334                 if (!p)
2335                         goto out_resource;
2336                 WRITE64((u64) statfs.f_ffree);
2337         }
2338         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2339                 p = xdr_reserve_space(xdr, 8);
2340                 if (!p)
2341                         goto out_resource;
2342                 WRITE64((u64) statfs.f_ffree);
2343         }
2344         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2345                 p = xdr_reserve_space(xdr, 8);
2346                 if (!p)
2347                         goto out_resource;
2348                 WRITE64((u64) statfs.f_files);
2349         }
2350         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2351                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2352                 if (status)
2353                         goto out;
2354         }
2355         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2356                 p = xdr_reserve_space(xdr, 4);
2357                 if (!p)
2358                         goto out_resource;
2359                 WRITE32(1);
2360         }
2361         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2362                 p = xdr_reserve_space(xdr, 8);
2363                 if (!p)
2364                         goto out_resource;
2365                 WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
2366         }
2367         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2368                 p = xdr_reserve_space(xdr, 4);
2369                 if (!p)
2370                         goto out_resource;
2371                 WRITE32(255);
2372         }
2373         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2374                 p = xdr_reserve_space(xdr, 4);
2375                 if (!p)
2376                         goto out_resource;
2377                 WRITE32(statfs.f_namelen);
2378         }
2379         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2380                 p = xdr_reserve_space(xdr, 8);
2381                 if (!p)
2382                         goto out_resource;
2383                 WRITE64((u64) svc_max_payload(rqstp));
2384         }
2385         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2386                 p = xdr_reserve_space(xdr, 8);
2387                 if (!p)
2388                         goto out_resource;
2389                 WRITE64((u64) svc_max_payload(rqstp));
2390         }
2391         if (bmval1 & FATTR4_WORD1_MODE) {
2392                 p = xdr_reserve_space(xdr, 4);
2393                 if (!p)
2394                         goto out_resource;
2395                 WRITE32(stat.mode & S_IALLUGO);
2396         }
2397         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2398                 p = xdr_reserve_space(xdr, 4);
2399                 if (!p)
2400                         goto out_resource;
2401                 WRITE32(1);
2402         }
2403         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2404                 p = xdr_reserve_space(xdr, 4);
2405                 if (!p)
2406                         goto out_resource;
2407                 WRITE32(stat.nlink);
2408         }
2409         if (bmval1 & FATTR4_WORD1_OWNER) {
2410                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2411                 if (status)
2412                         goto out;
2413         }
2414         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2415                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2416                 if (status)
2417                         goto out;
2418         }
2419         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2420                 p = xdr_reserve_space(xdr, 8);
2421                 if (!p)
2422                         goto out_resource;
2423                 WRITE32((u32) MAJOR(stat.rdev));
2424                 WRITE32((u32) MINOR(stat.rdev));
2425         }
2426         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2427                 p = xdr_reserve_space(xdr, 8);
2428                 if (!p)
2429                         goto out_resource;
2430                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2431                 WRITE64(dummy64);
2432         }
2433         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2434                 p = xdr_reserve_space(xdr, 8);
2435                 if (!p)
2436                         goto out_resource;
2437                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2438                 WRITE64(dummy64);
2439         }
2440         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2441                 p = xdr_reserve_space(xdr, 8);
2442                 if (!p)
2443                         goto out_resource;
2444                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2445                 WRITE64(dummy64);
2446         }
2447         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2448                 p = xdr_reserve_space(xdr, 8);
2449                 if (!p)
2450                         goto out_resource;
2451                 dummy64 = (u64)stat.blocks << 9;
2452                 WRITE64(dummy64);
2453         }
2454         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2455                 p = xdr_reserve_space(xdr, 12);
2456                 if (!p)
2457                         goto out_resource;
2458                 WRITE64((s64)stat.atime.tv_sec);
2459                 WRITE32(stat.atime.tv_nsec);
2460         }
2461         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2462                 p = xdr_reserve_space(xdr, 12);
2463                 if (!p)
2464                         goto out_resource;
2465                 WRITE32(0);
2466                 WRITE32(1);
2467                 WRITE32(0);
2468         }
2469         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2470                 p = xdr_reserve_space(xdr, 12);
2471                 if (!p)
2472                         goto out_resource;
2473                 WRITE64((s64)stat.ctime.tv_sec);
2474                 WRITE32(stat.ctime.tv_nsec);
2475         }
2476         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2477                 p = xdr_reserve_space(xdr, 12);
2478                 if (!p)
2479                         goto out_resource;
2480                 WRITE64((s64)stat.mtime.tv_sec);
2481                 WRITE32(stat.mtime.tv_nsec);
2482         }
2483         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2484                 p = xdr_reserve_space(xdr, 8);
2485                 if (!p)
2486                         goto out_resource;
2487                 /*
2488                  * Get parent's attributes if not ignoring crossmount
2489                  * and this is the root of a cross-mounted filesystem.
2490                  */
2491                 if (ignore_crossmnt == 0 &&
2492                     dentry == exp->ex_path.mnt->mnt_root)
2493                         get_parent_attributes(exp, &stat);
2494                 WRITE64(stat.ino);
2495         }
2496         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2497                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2498                                                                 contextlen);
2499                 if (status)
2500                         goto out;
2501         }
2502         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2503                 p = xdr_reserve_space(xdr, 16);
2504                 if (!p)
2505                         goto out_resource;
2506                 WRITE32(3);
2507                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2508                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2509                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2510         }
2511
2512         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2513         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2514         status = nfs_ok;
2515
2516 out:
2517 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2518         if (context)
2519                 security_release_secctx(context, contextlen);
2520 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2521         kfree(acl);
2522         if (tempfh) {
2523                 fh_put(tempfh);
2524                 kfree(tempfh);
2525         }
2526         if (status)
2527                 xdr_truncate_encode(xdr, starting_len);
2528         return status;
2529 out_nfserr:
2530         status = nfserrno(err);
2531         goto out;
2532 out_resource:
2533         status = nfserr_resource;
2534         goto out;
2535 }
2536
2537 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2538                                 struct xdr_buf *buf, __be32 *p, int bytes)
2539 {
2540         xdr->scratch.iov_len = 0;
2541         memset(buf, 0, sizeof(struct xdr_buf));
2542         buf->head[0].iov_base = p;
2543         buf->head[0].iov_len = 0;
2544         buf->len = 0;
2545         xdr->buf = buf;
2546         xdr->iov = buf->head;
2547         xdr->p = p;
2548         xdr->end = (void *)p + bytes;
2549         buf->buflen = bytes;
2550 }
2551
2552 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2553                         struct svc_fh *fhp, struct svc_export *exp,
2554                         struct dentry *dentry, u32 *bmval,
2555                         struct svc_rqst *rqstp, int ignore_crossmnt)
2556 {
2557         struct xdr_buf dummy;
2558         struct xdr_stream xdr;
2559         __be32 ret;
2560
2561         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2562         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2563                                                         ignore_crossmnt);
2564         *p = xdr.p;
2565         return ret;
2566 }
2567
2568 static inline int attributes_need_mount(u32 *bmval)
2569 {
2570         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2571                 return 1;
2572         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2573                 return 1;
2574         return 0;
2575 }
2576
2577 static __be32
2578 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2579                 const char *name, int namlen, __be32 **p, int buflen)
2580 {
2581         struct svc_export *exp = cd->rd_fhp->fh_export;
2582         struct dentry *dentry;
2583         __be32 nfserr;
2584         int ignore_crossmnt = 0;
2585
2586         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2587         if (IS_ERR(dentry))
2588                 return nfserrno(PTR_ERR(dentry));
2589         if (!dentry->d_inode) {
2590                 /*
2591                  * nfsd_buffered_readdir drops the i_mutex between
2592                  * readdir and calling this callback, leaving a window
2593                  * where this directory entry could have gone away.
2594                  */
2595                 dput(dentry);
2596                 return nfserr_noent;
2597         }
2598
2599         exp_get(exp);
2600         /*
2601          * In the case of a mountpoint, the client may be asking for
2602          * attributes that are only properties of the underlying filesystem
2603          * as opposed to the cross-mounted file system. In such a case,
2604          * we will not follow the cross mount and will fill the attribtutes
2605          * directly from the mountpoint dentry.
2606          */
2607         if (nfsd_mountpoint(dentry, exp)) {
2608                 int err;
2609
2610                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2611                                 && !attributes_need_mount(cd->rd_bmval)) {
2612                         ignore_crossmnt = 1;
2613                         goto out_encode;
2614                 }
2615                 /*
2616                  * Why the heck aren't we just using nfsd_lookup??
2617                  * Different "."/".." handling?  Something else?
2618                  * At least, add a comment here to explain....
2619                  */
2620                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2621                 if (err) {
2622                         nfserr = nfserrno(err);
2623                         goto out_put;
2624                 }
2625                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2626                 if (nfserr)
2627                         goto out_put;
2628
2629         }
2630 out_encode:
2631         nfserr = nfsd4_encode_fattr_to_buf(p, buflen, NULL, exp, dentry,
2632                                         cd->rd_bmval,
2633                                         cd->rd_rqstp, ignore_crossmnt);
2634 out_put:
2635         dput(dentry);
2636         exp_put(exp);
2637         return nfserr;
2638 }
2639
2640 static __be32 *
2641 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2642 {
2643         if (buflen < 6)
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         int buflen;
2661         __be32 *p = cd->buffer;
2662         __be32 *cookiep;
2663         __be32 nfserr = nfserr_toosmall;
2664
2665         /* In nfsv4, "." and ".." never make it onto the wire.. */
2666         if (name && isdotent(name, namlen)) {
2667                 cd->common.err = nfs_ok;
2668                 return 0;
2669         }
2670
2671         if (cd->offset)
2672                 xdr_encode_hyper(cd->offset, (u64) offset);
2673
2674         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2675         if (buflen < 0)
2676                 goto fail;
2677
2678         *p++ = xdr_one;                             /* mark entry present */
2679         cookiep = p;
2680         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2681         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2682
2683         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2684         switch (nfserr) {
2685         case nfs_ok:
2686                 break;
2687         case nfserr_resource:
2688                 nfserr = nfserr_toosmall;
2689                 goto fail;
2690         case nfserr_noent:
2691                 goto skip_entry;
2692         default:
2693                 /*
2694                  * If the client requested the RDATTR_ERROR attribute,
2695                  * we stuff the error code into this attribute
2696                  * and continue.  If this attribute was not requested,
2697                  * then in accordance with the spec, we fail the
2698                  * entire READDIR operation(!)
2699                  */
2700                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2701                         goto fail;
2702                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2703                 if (p == NULL) {
2704                         nfserr = nfserr_toosmall;
2705                         goto fail;
2706                 }
2707         }
2708         cd->buflen -= (p - cd->buffer);
2709         cd->buffer = p;
2710         cd->offset = cookiep;
2711 skip_entry:
2712         cd->common.err = nfs_ok;
2713         return 0;
2714 fail:
2715         cd->common.err = nfserr;
2716         return -EINVAL;
2717 }
2718
2719 static __be32
2720 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2721 {
2722         __be32 *p;
2723
2724         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2725         if (!p)
2726                 return nfserr_resource;
2727         WRITE32(sid->si_generation);
2728         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2729         return 0;
2730 }
2731
2732 static __be32
2733 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2734 {
2735         struct xdr_stream *xdr = &resp->xdr;
2736         __be32 *p;
2737
2738         if (!nfserr) {
2739                 p = xdr_reserve_space(xdr, 8);
2740                 if (!p)
2741                         return nfserr_resource;
2742                 WRITE32(access->ac_supported);
2743                 WRITE32(access->ac_resp_access);
2744         }
2745         return nfserr;
2746 }
2747
2748 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2749 {
2750         struct xdr_stream *xdr = &resp->xdr;
2751         __be32 *p;
2752
2753         if (!nfserr) {
2754                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2755                 if (!p)
2756                         return nfserr_resource;
2757                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2758                 WRITE32(bcts->dir);
2759                 /* Sorry, we do not yet support RDMA over 4.1: */
2760                 WRITE32(0);
2761         }
2762         return nfserr;
2763 }
2764
2765 static __be32
2766 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2767 {
2768         struct xdr_stream *xdr = &resp->xdr;
2769
2770         if (!nfserr)
2771                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2772
2773         return nfserr;
2774 }
2775
2776
2777 static __be32
2778 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2779 {
2780         struct xdr_stream *xdr = &resp->xdr;
2781         __be32 *p;
2782
2783         if (!nfserr) {
2784                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2785                 if (!p)
2786                         return nfserr_resource;
2787                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2788         }
2789         return nfserr;
2790 }
2791
2792 static __be32
2793 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2794 {
2795         struct xdr_stream *xdr = &resp->xdr;
2796         __be32 *p;
2797
2798         if (!nfserr) {
2799                 p = xdr_reserve_space(xdr, 32);
2800                 if (!p)
2801                         return nfserr_resource;
2802                 write_cinfo(&p, &create->cr_cinfo);
2803                 WRITE32(2);
2804                 WRITE32(create->cr_bmval[0]);
2805                 WRITE32(create->cr_bmval[1]);
2806         }
2807         return nfserr;
2808 }
2809
2810 static __be32
2811 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2812 {
2813         struct svc_fh *fhp = getattr->ga_fhp;
2814         struct xdr_stream *xdr = &resp->xdr;
2815
2816         if (nfserr)
2817                 return nfserr;
2818
2819         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2820                                     getattr->ga_bmval,
2821                                     resp->rqstp, 0);
2822         return nfserr;
2823 }
2824
2825 static __be32
2826 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2827 {
2828         struct xdr_stream *xdr = &resp->xdr;
2829         struct svc_fh *fhp = *fhpp;
2830         unsigned int len;
2831         __be32 *p;
2832
2833         if (!nfserr) {
2834                 len = fhp->fh_handle.fh_size;
2835                 p = xdr_reserve_space(xdr, len + 4);
2836                 if (!p)
2837                         return nfserr_resource;
2838                 WRITE32(len);
2839                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2840         }
2841         return nfserr;
2842 }
2843
2844 /*
2845 * Including all fields other than the name, a LOCK4denied structure requires
2846 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2847 */
2848 static __be32
2849 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2850 {
2851         struct xdr_netobj *conf = &ld->ld_owner;
2852         __be32 *p;
2853
2854 again:
2855         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2856         if (!p) {
2857                 /*
2858                  * Don't fail to return the result just because we can't
2859                  * return the conflicting open:
2860                  */
2861                 if (conf->len) {
2862                         conf->len = 0;
2863                         conf->data = NULL;
2864                         goto again;
2865                 }
2866                 return nfserr_resource;
2867         }
2868         WRITE64(ld->ld_start);
2869         WRITE64(ld->ld_length);
2870         WRITE32(ld->ld_type);
2871         if (conf->len) {
2872                 WRITEMEM(&ld->ld_clientid, 8);
2873                 WRITE32(conf->len);
2874                 WRITEMEM(conf->data, conf->len);
2875         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2876                 WRITE64((u64)0); /* clientid */
2877                 WRITE32(0); /* length of owner name */
2878         }
2879         return nfserr_denied;
2880 }
2881
2882 static __be32
2883 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2884 {
2885         struct xdr_stream *xdr = &resp->xdr;
2886
2887         if (!nfserr)
2888                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2889         else if (nfserr == nfserr_denied)
2890                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2891         kfree(lock->lk_denied.ld_owner.data);
2892         return nfserr;
2893 }
2894
2895 static __be32
2896 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2897 {
2898         struct xdr_stream *xdr = &resp->xdr;
2899
2900         if (nfserr == nfserr_denied)
2901                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2902         return nfserr;
2903 }
2904
2905 static __be32
2906 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2907 {
2908         struct xdr_stream *xdr = &resp->xdr;
2909
2910         if (!nfserr)
2911                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2912
2913         return nfserr;
2914 }
2915
2916
2917 static __be32
2918 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2919 {
2920         struct xdr_stream *xdr = &resp->xdr;
2921         __be32 *p;
2922
2923         if (!nfserr) {
2924                 p = xdr_reserve_space(xdr, 20);
2925                 if (!p)
2926                         return nfserr_resource;
2927                 write_cinfo(&p, &link->li_cinfo);
2928         }
2929         return nfserr;
2930 }
2931
2932
2933 static __be32
2934 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2935 {
2936         struct xdr_stream *xdr = &resp->xdr;
2937         __be32 *p;
2938
2939         if (nfserr)
2940                 goto out;
2941
2942         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2943         if (nfserr)
2944                 goto out;
2945         p = xdr_reserve_space(xdr, 40);
2946         if (!p)
2947                 return nfserr_resource;
2948         write_cinfo(&p, &open->op_cinfo);
2949         WRITE32(open->op_rflags);
2950         WRITE32(2);
2951         WRITE32(open->op_bmval[0]);
2952         WRITE32(open->op_bmval[1]);
2953         WRITE32(open->op_delegate_type);
2954
2955         switch (open->op_delegate_type) {
2956         case NFS4_OPEN_DELEGATE_NONE:
2957                 break;
2958         case NFS4_OPEN_DELEGATE_READ:
2959                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2960                 if (nfserr)
2961                         return nfserr;
2962                 p = xdr_reserve_space(xdr, 20);
2963                 if (!p)
2964                         return nfserr_resource;
2965                 WRITE32(open->op_recall);
2966
2967                 /*
2968                  * TODO: ACE's in delegations
2969                  */
2970                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2971                 WRITE32(0);
2972                 WRITE32(0);
2973                 WRITE32(0);   /* XXX: is NULL principal ok? */
2974                 break;
2975         case NFS4_OPEN_DELEGATE_WRITE:
2976                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2977                 if (nfserr)
2978                         return nfserr;
2979                 p = xdr_reserve_space(xdr, 32);
2980                 if (!p)
2981                         return nfserr_resource;
2982                 WRITE32(0);
2983
2984                 /*
2985                  * TODO: space_limit's in delegations
2986                  */
2987                 WRITE32(NFS4_LIMIT_SIZE);
2988                 WRITE32(~(u32)0);
2989                 WRITE32(~(u32)0);
2990
2991                 /*
2992                  * TODO: ACE's in delegations
2993                  */
2994                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2995                 WRITE32(0);
2996                 WRITE32(0);
2997                 WRITE32(0);   /* XXX: is NULL principal ok? */
2998                 break;
2999         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3000                 switch (open->op_why_no_deleg) {
3001                 case WND4_CONTENTION:
3002                 case WND4_RESOURCE:
3003                         p = xdr_reserve_space(xdr, 8);
3004                         if (!p)
3005                                 return nfserr_resource;
3006                         WRITE32(open->op_why_no_deleg);
3007                         WRITE32(0);     /* deleg signaling not supported yet */
3008                         break;
3009                 default:
3010                         p = xdr_reserve_space(xdr, 4);
3011                         if (!p)
3012                                 return nfserr_resource;
3013                         WRITE32(open->op_why_no_deleg);
3014                 }
3015                 break;
3016         default:
3017                 BUG();
3018         }
3019         /* XXX save filehandle here */
3020 out:
3021         return nfserr;
3022 }
3023
3024 static __be32
3025 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3026 {
3027         struct xdr_stream *xdr = &resp->xdr;
3028
3029         if (!nfserr)
3030                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3031
3032         return nfserr;
3033 }
3034
3035 static __be32
3036 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3037 {
3038         struct xdr_stream *xdr = &resp->xdr;
3039
3040         if (!nfserr)
3041                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3042
3043         return nfserr;
3044 }
3045
3046 static __be32
3047 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3048                   struct nfsd4_read *read)
3049 {
3050         u32 eof;
3051         int v;
3052         struct page *page;
3053         unsigned long maxcount;
3054         struct xdr_stream *xdr = &resp->xdr;
3055         int starting_len = xdr->buf->len;
3056         long len;
3057         __be32 *p;
3058
3059         if (nfserr)
3060                 return nfserr;
3061
3062         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3063         if (!p)
3064                 return nfserr_resource;
3065
3066         /* Make sure there will be room for padding if needed: */
3067         if (xdr->end - xdr->p < 1)
3068                 return nfserr_resource;
3069
3070         if (resp->xdr.buf->page_len)
3071                 return nfserr_resource;
3072
3073         maxcount = svc_max_payload(resp->rqstp);
3074         if (maxcount > read->rd_length)
3075                 maxcount = read->rd_length;
3076
3077         len = maxcount;
3078         v = 0;
3079         while (len) {
3080                 int thislen;
3081
3082                 page = *(resp->rqstp->rq_next_page);
3083                 if (!page) { /* ran out of pages */
3084                         maxcount -= len;
3085                         break;
3086                 }
3087                 thislen = min_t(long, len, PAGE_SIZE);
3088                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
3089                 resp->rqstp->rq_vec[v].iov_len = thislen;
3090                 resp->rqstp->rq_next_page++;
3091                 v++;
3092                 len -= thislen;
3093         }
3094         read->rd_vlen = v;
3095
3096         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3097                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
3098                         &maxcount);
3099
3100         if (nfserr) {
3101                 /*
3102                  * nfsd_splice_actor may have already messed with the
3103                  * page length; reset it so as not to confuse
3104                  * xdr_truncate_encode:
3105                  */
3106                 xdr->buf->page_len = 0;
3107                 xdr_truncate_encode(xdr, starting_len);
3108                 return nfserr;
3109         }
3110         eof = (read->rd_offset + maxcount >=
3111                read->rd_fhp->fh_dentry->d_inode->i_size);
3112
3113         WRITE32(eof);
3114         WRITE32(maxcount);
3115         WARN_ON_ONCE(resp->xdr.buf->head[0].iov_len != (char *)p
3116                                 - (char *)resp->xdr.buf->head[0].iov_base);
3117         resp->xdr.buf->page_len = maxcount;
3118         xdr->buf->len += maxcount;
3119         xdr->page_ptr += v;
3120         xdr->buf->buflen = maxcount + PAGE_SIZE - 2 * RPC_MAX_AUTH_SIZE;
3121         xdr->iov = xdr->buf->tail;
3122
3123         /* Use rest of head for padding and remaining ops: */
3124         resp->xdr.buf->tail[0].iov_base = p;
3125         resp->xdr.buf->tail[0].iov_len = 0;
3126         if (maxcount&3) {
3127                 p = xdr_reserve_space(xdr, 4);
3128                 WRITE32(0);
3129                 resp->xdr.buf->tail[0].iov_base += maxcount&3;
3130                 resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3131                 xdr->buf->len -= (maxcount&3);
3132         }
3133         return 0;
3134 }
3135
3136 static __be32
3137 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3138 {
3139         int maxcount;
3140         struct xdr_stream *xdr = &resp->xdr;
3141         char *page;
3142         int length_offset = xdr->buf->len;
3143         __be32 *p;
3144
3145         if (nfserr)
3146                 return nfserr;
3147
3148         p = xdr_reserve_space(xdr, 4);
3149         if (!p)
3150                 return nfserr_resource;
3151
3152         if (resp->xdr.buf->page_len)
3153                 return nfserr_resource;
3154         if (!*resp->rqstp->rq_next_page)
3155                 return nfserr_resource;
3156
3157         page = page_address(*(resp->rqstp->rq_next_page++));
3158
3159         maxcount = PAGE_SIZE;
3160
3161         if (xdr->end - xdr->p < 1)
3162                 return nfserr_resource;
3163
3164         /*
3165          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3166          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3167          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3168          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3169          */
3170         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3171         if (nfserr == nfserr_isdir)
3172                 nfserr = nfserr_inval;
3173         if (nfserr) {
3174                 xdr_truncate_encode(xdr, length_offset);
3175                 return nfserr;
3176         }
3177
3178         WRITE32(maxcount);
3179         resp->xdr.buf->head[0].iov_len = (char *)p
3180                                 - (char *)resp->xdr.buf->head[0].iov_base;
3181         resp->xdr.buf->page_len = maxcount;
3182         xdr->buf->len += maxcount;
3183         xdr->page_ptr += 1;
3184         xdr->buf->buflen -= PAGE_SIZE;
3185         xdr->iov = xdr->buf->tail;
3186
3187         /* Use rest of head for padding and remaining ops: */
3188         resp->xdr.buf->tail[0].iov_base = p;
3189         resp->xdr.buf->tail[0].iov_len = 0;
3190         if (maxcount&3) {
3191                 p = xdr_reserve_space(xdr, 4);
3192                 WRITE32(0);
3193                 resp->xdr.buf->tail[0].iov_base += maxcount&3;
3194                 resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3195         }
3196         return 0;
3197 }
3198
3199 static __be32
3200 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3201 {
3202         int maxcount;
3203         loff_t offset;
3204         struct xdr_stream *xdr = &resp->xdr;
3205         int starting_len = xdr->buf->len;
3206         __be32 *page, *tailbase;
3207         __be32 *p;
3208
3209         if (nfserr)
3210                 return nfserr;
3211
3212         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3213         if (!p)
3214                 return nfserr_resource;
3215
3216         if (resp->xdr.buf->page_len)
3217                 return nfserr_resource;
3218         if (!*resp->rqstp->rq_next_page)
3219                 return nfserr_resource;
3220
3221         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3222         WRITE32(0);
3223         WRITE32(0);
3224         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3225                                 - (char *)resp->xdr.buf->head[0].iov_base;
3226         tailbase = p;
3227
3228         maxcount = PAGE_SIZE;
3229         if (maxcount > readdir->rd_maxcount)
3230                 maxcount = readdir->rd_maxcount;
3231
3232         /*
3233          * Convert from bytes to words, account for the two words already
3234          * written, make sure to leave two words at the end for the next
3235          * pointer and eof field.
3236          */
3237         maxcount = (maxcount >> 2) - 4;
3238         if (maxcount < 0) {
3239                 nfserr =  nfserr_toosmall;
3240                 goto err_no_verf;
3241         }
3242
3243         page = page_address(*(resp->rqstp->rq_next_page++));
3244         readdir->common.err = 0;
3245         readdir->buflen = maxcount;
3246         readdir->buffer = page;
3247         readdir->offset = NULL;
3248
3249         offset = readdir->rd_cookie;
3250         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3251                               &offset,
3252                               &readdir->common, nfsd4_encode_dirent);
3253         if (nfserr == nfs_ok &&
3254             readdir->common.err == nfserr_toosmall &&
3255             readdir->buffer == page)
3256                 nfserr = nfserr_toosmall;
3257         if (nfserr)
3258                 goto err_no_verf;
3259
3260         if (readdir->offset)
3261                 xdr_encode_hyper(readdir->offset, offset);
3262
3263         p = readdir->buffer;
3264         *p++ = 0;       /* no more entries */
3265         *p++ = htonl(readdir->common.err == nfserr_eof);
3266         resp->xdr.buf->page_len = ((char *)p) -
3267                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3268         xdr->buf->len += xdr->buf->page_len;
3269
3270         xdr->iov = xdr->buf->tail;
3271
3272         xdr->page_ptr++;
3273         xdr->buf->buflen -= PAGE_SIZE;
3274         xdr->iov = xdr->buf->tail;
3275
3276         /* Use rest of head for padding and remaining ops: */
3277         resp->xdr.buf->tail[0].iov_base = tailbase;
3278         resp->xdr.buf->tail[0].iov_len = 0;
3279         resp->xdr.p = resp->xdr.buf->tail[0].iov_base;
3280         resp->xdr.end = resp->xdr.p +
3281                         (PAGE_SIZE - resp->xdr.buf->head[0].iov_len)/4;
3282
3283         return 0;
3284 err_no_verf:
3285         xdr_truncate_encode(xdr, starting_len);
3286         return nfserr;
3287 }
3288
3289 static __be32
3290 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3291 {
3292         struct xdr_stream *xdr = &resp->xdr;
3293         __be32 *p;
3294
3295         if (!nfserr) {
3296                 p = xdr_reserve_space(xdr, 20);
3297                 if (!p)
3298                         return nfserr_resource;
3299                 write_cinfo(&p, &remove->rm_cinfo);
3300         }
3301         return nfserr;
3302 }
3303
3304 static __be32
3305 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3306 {
3307         struct xdr_stream *xdr = &resp->xdr;
3308         __be32 *p;
3309
3310         if (!nfserr) {
3311                 p = xdr_reserve_space(xdr, 40);
3312                 if (!p)
3313                         return nfserr_resource;
3314                 write_cinfo(&p, &rename->rn_sinfo);
3315                 write_cinfo(&p, &rename->rn_tinfo);
3316         }
3317         return nfserr;
3318 }
3319
3320 static __be32
3321 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3322                          __be32 nfserr, struct svc_export *exp)
3323 {
3324         u32 i, nflavs, supported;
3325         struct exp_flavor_info *flavs;
3326         struct exp_flavor_info def_flavs[2];
3327         __be32 *p, *flavorsp;
3328         static bool report = true;
3329
3330         if (nfserr)
3331                 goto out;
3332         nfserr = nfserr_resource;
3333         if (exp->ex_nflavors) {
3334                 flavs = exp->ex_flavors;
3335                 nflavs = exp->ex_nflavors;
3336         } else { /* Handling of some defaults in absence of real secinfo: */
3337                 flavs = def_flavs;
3338                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3339                         nflavs = 2;
3340                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3341                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3342                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3343                         nflavs = 1;
3344                         flavs[0].pseudoflavor
3345                                         = svcauth_gss_flavor(exp->ex_client);
3346                 } else {
3347                         nflavs = 1;
3348                         flavs[0].pseudoflavor
3349                                         = exp->ex_client->flavour->flavour;
3350                 }
3351         }
3352
3353         supported = 0;
3354         p = xdr_reserve_space(xdr, 4);
3355         if (!p)
3356                 goto out;
3357         flavorsp = p++;         /* to be backfilled later */
3358
3359         for (i = 0; i < nflavs; i++) {
3360                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3361                 struct rpcsec_gss_info info;
3362
3363                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3364                         supported++;
3365                         p = xdr_reserve_space(xdr, 4 + 4 +
3366                                               XDR_LEN(info.oid.len) + 4 + 4);
3367                         if (!p)
3368                                 goto out;
3369                         WRITE32(RPC_AUTH_GSS);
3370                         WRITE32(info.oid.len);
3371                         WRITEMEM(info.oid.data, info.oid.len);
3372                         WRITE32(info.qop);
3373                         WRITE32(info.service);
3374                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3375                         supported++;
3376                         p = xdr_reserve_space(xdr, 4);
3377                         if (!p)
3378                                 goto out;
3379                         WRITE32(pf);
3380                 } else {
3381                         if (report)
3382                                 pr_warn("NFS: SECINFO: security flavor %u "
3383                                         "is not supported\n", pf);
3384                 }
3385         }
3386
3387         if (nflavs != supported)
3388                 report = false;
3389         *flavorsp = htonl(supported);
3390         nfserr = 0;
3391 out:
3392         if (exp)
3393                 exp_put(exp);
3394         return nfserr;
3395 }
3396
3397 static __be32
3398 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3399                      struct nfsd4_secinfo *secinfo)
3400 {
3401         struct xdr_stream *xdr = &resp->xdr;
3402
3403         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3404 }
3405
3406 static __be32
3407 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3408                      struct nfsd4_secinfo_no_name *secinfo)
3409 {
3410         struct xdr_stream *xdr = &resp->xdr;
3411
3412         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3413 }
3414
3415 /*
3416  * The SETATTR encode routine is special -- it always encodes a bitmap,
3417  * regardless of the error status.
3418  */
3419 static __be32
3420 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3421 {
3422         struct xdr_stream *xdr = &resp->xdr;
3423         __be32 *p;
3424
3425         p = xdr_reserve_space(xdr, 16);
3426         if (!p)
3427                 return nfserr_resource;
3428         if (nfserr) {
3429                 WRITE32(3);
3430                 WRITE32(0);
3431                 WRITE32(0);
3432                 WRITE32(0);
3433         }
3434         else {
3435                 WRITE32(3);
3436                 WRITE32(setattr->sa_bmval[0]);
3437                 WRITE32(setattr->sa_bmval[1]);
3438                 WRITE32(setattr->sa_bmval[2]);
3439         }
3440         return nfserr;
3441 }
3442
3443 static __be32
3444 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3445 {
3446         struct xdr_stream *xdr = &resp->xdr;
3447         __be32 *p;
3448
3449         if (!nfserr) {
3450                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3451                 if (!p)
3452                         return nfserr_resource;
3453                 WRITEMEM(&scd->se_clientid, 8);
3454                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3455         }
3456         else if (nfserr == nfserr_clid_inuse) {
3457                 p = xdr_reserve_space(xdr, 8);
3458                 if (!p)
3459                         return nfserr_resource;
3460                 WRITE32(0);
3461                 WRITE32(0);
3462         }
3463         return nfserr;
3464 }
3465
3466 static __be32
3467 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3468 {
3469         struct xdr_stream *xdr = &resp->xdr;
3470         __be32 *p;
3471
3472         if (!nfserr) {
3473                 p = xdr_reserve_space(xdr, 16);
3474                 if (!p)
3475                         return nfserr_resource;
3476                 WRITE32(write->wr_bytes_written);
3477                 WRITE32(write->wr_how_written);
3478                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3479         }
3480         return nfserr;
3481 }
3482
3483 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3484         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3485               1 << (OP_EXCHANGE_ID - 32) |
3486               1 << (OP_CREATE_SESSION - 32) |
3487               1 << (OP_DESTROY_SESSION - 32) |
3488               1 << (OP_DESTROY_CLIENTID - 32)
3489 };
3490
3491 static __be32
3492 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3493                          struct nfsd4_exchange_id *exid)
3494 {
3495         struct xdr_stream *xdr = &resp->xdr;
3496         __be32 *p;
3497         char *major_id;
3498         char *server_scope;
3499         int major_id_sz;
3500         int server_scope_sz;
3501         uint64_t minor_id = 0;
3502
3503         if (nfserr)
3504                 return nfserr;
3505
3506         major_id = utsname()->nodename;
3507         major_id_sz = strlen(major_id);
3508         server_scope = utsname()->nodename;
3509         server_scope_sz = strlen(server_scope);
3510
3511         p = xdr_reserve_space(xdr,
3512                 8 /* eir_clientid */ +
3513                 4 /* eir_sequenceid */ +
3514                 4 /* eir_flags */ +
3515                 4 /* spr_how */);
3516         if (!p)
3517                 return nfserr_resource;
3518
3519         WRITEMEM(&exid->clientid, 8);
3520         WRITE32(exid->seqid);
3521         WRITE32(exid->flags);
3522
3523         WRITE32(exid->spa_how);
3524
3525         switch (exid->spa_how) {
3526         case SP4_NONE:
3527                 break;
3528         case SP4_MACH_CRED:
3529                 /* spo_must_enforce, spo_must_allow */
3530                 p = xdr_reserve_space(xdr, 16);
3531                 if (!p)
3532                         return nfserr_resource;
3533
3534                 /* spo_must_enforce bitmap: */
3535                 WRITE32(2);
3536                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3537                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3538                 /* empty spo_must_allow bitmap: */
3539                 WRITE32(0);
3540
3541                 break;
3542         default:
3543                 WARN_ON_ONCE(1);
3544         }
3545
3546         p = xdr_reserve_space(xdr,
3547                 8 /* so_minor_id */ +
3548                 4 /* so_major_id.len */ +
3549                 (XDR_QUADLEN(major_id_sz) * 4) +
3550                 4 /* eir_server_scope.len */ +
3551                 (XDR_QUADLEN(server_scope_sz) * 4) +
3552                 4 /* eir_server_impl_id.count (0) */);
3553         if (!p)
3554                 return nfserr_resource;
3555
3556         /* The server_owner struct */
3557         WRITE64(minor_id);      /* Minor id */
3558         /* major id */
3559         WRITE32(major_id_sz);
3560         WRITEMEM(major_id, major_id_sz);
3561
3562         /* Server scope */
3563         WRITE32(server_scope_sz);
3564         WRITEMEM(server_scope, server_scope_sz);
3565
3566         /* Implementation id */
3567         WRITE32(0);     /* zero length nfs_impl_id4 array */
3568         return 0;
3569 }
3570
3571 static __be32
3572 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3573                             struct nfsd4_create_session *sess)
3574 {
3575         struct xdr_stream *xdr = &resp->xdr;
3576         __be32 *p;
3577
3578         if (nfserr)
3579                 return nfserr;
3580
3581         p = xdr_reserve_space(xdr, 24);
3582         if (!p)
3583                 return nfserr_resource;
3584         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3585         WRITE32(sess->seqid);
3586         WRITE32(sess->flags);
3587
3588         p = xdr_reserve_space(xdr, 28);
3589         if (!p)
3590                 return nfserr_resource;
3591         WRITE32(0); /* headerpadsz */
3592         WRITE32(sess->fore_channel.maxreq_sz);
3593         WRITE32(sess->fore_channel.maxresp_sz);
3594         WRITE32(sess->fore_channel.maxresp_cached);
3595         WRITE32(sess->fore_channel.maxops);
3596         WRITE32(sess->fore_channel.maxreqs);
3597         WRITE32(sess->fore_channel.nr_rdma_attrs);
3598
3599         if (sess->fore_channel.nr_rdma_attrs) {
3600                 p = xdr_reserve_space(xdr, 4);
3601                 if (!p)
3602                         return nfserr_resource;
3603                 WRITE32(sess->fore_channel.rdma_attrs);
3604         }
3605
3606         p = xdr_reserve_space(xdr, 28);
3607         if (!p)
3608                 return nfserr_resource;
3609         WRITE32(0); /* headerpadsz */
3610         WRITE32(sess->back_channel.maxreq_sz);
3611         WRITE32(sess->back_channel.maxresp_sz);
3612         WRITE32(sess->back_channel.maxresp_cached);
3613         WRITE32(sess->back_channel.maxops);
3614         WRITE32(sess->back_channel.maxreqs);
3615         WRITE32(sess->back_channel.nr_rdma_attrs);
3616
3617         if (sess->back_channel.nr_rdma_attrs) {
3618                 p = xdr_reserve_space(xdr, 4);
3619                 if (!p)
3620                         return nfserr_resource;
3621                 WRITE32(sess->back_channel.rdma_attrs);
3622         }
3623         return 0;
3624 }
3625
3626 static __be32
3627 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3628                       struct nfsd4_sequence *seq)
3629 {
3630         struct xdr_stream *xdr = &resp->xdr;
3631         __be32 *p;
3632
3633         if (nfserr)
3634                 return nfserr;
3635
3636         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3637         if (!p)
3638                 return nfserr_resource;
3639         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3640         WRITE32(seq->seqid);
3641         WRITE32(seq->slotid);
3642         /* Note slotid's are numbered from zero: */
3643         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3644         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3645         WRITE32(seq->status_flags);
3646
3647         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3648         return 0;
3649 }
3650
3651 static __be32
3652 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3653                           struct nfsd4_test_stateid *test_stateid)
3654 {
3655         struct xdr_stream *xdr = &resp->xdr;
3656         struct nfsd4_test_stateid_id *stateid, *next;
3657         __be32 *p;
3658
3659         if (nfserr)
3660                 return nfserr;
3661
3662         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3663         if (!p)
3664                 return nfserr_resource;
3665         *p++ = htonl(test_stateid->ts_num_ids);
3666
3667         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3668                 *p++ = stateid->ts_id_status;
3669         }
3670
3671         return nfserr;
3672 }
3673
3674 static __be32
3675 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3676 {
3677         return nfserr;
3678 }
3679
3680 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3681
3682 /*
3683  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3684  * since we don't need to filter out obsolete ops as this is
3685  * done in the decoding phase.
3686  */
3687 static nfsd4_enc nfsd4_enc_ops[] = {
3688         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3689         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3690         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3691         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3692         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3693         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3694         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3695         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3696         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3697         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3698         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3699         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3700         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3701         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3702         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3703         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3704         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3705         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3706         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3707         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3708         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3709         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3710         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3711         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3712         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3713         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3714         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3715         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3716         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3717         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3718         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3719         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3720         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3721         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3722         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3723         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3724         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3725
3726         /* NFSv4.1 operations */
3727         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3728         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3729         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3730         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3731         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3732         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3733         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3734         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3735         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3736         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3737         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3738         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3739         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3740         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3741         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3742         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3743         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3744         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3745         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3746 };
3747
3748 /*
3749  * Calculate whether we still have space to encode repsize bytes.
3750  * There are two considerations:
3751  *     - For NFS versions >=4.1, the size of the reply must stay within
3752  *       session limits
3753  *     - For all NFS versions, we must stay within limited preallocated
3754  *       buffer space.
3755  *
3756  * This is called before the operation is processed, so can only provide
3757  * an upper estimate.  For some nonidempotent operations (such as
3758  * getattr), it's not necessarily a problem if that estimate is wrong,
3759  * as we can fail it after processing without significant side effects.
3760  */
3761 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3762 {
3763         struct xdr_buf *buf = &resp->rqstp->rq_res;
3764         struct nfsd4_session *session = resp->cstate.session;
3765
3766         if (nfsd4_has_session(&resp->cstate)) {
3767                 struct nfsd4_slot *slot = resp->cstate.slot;
3768
3769                 if (buf->len + respsize > session->se_fchannel.maxresp_sz)
3770                         return nfserr_rep_too_big;
3771
3772                 if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3773                     buf->len + respsize > session->se_fchannel.maxresp_cached)
3774                         return nfserr_rep_too_big_to_cache;
3775         }
3776
3777         if (buf->len + respsize > buf->buflen) {
3778                 WARN_ON_ONCE(nfsd4_has_session(&resp->cstate));
3779                 return nfserr_resource;
3780         }
3781
3782         return 0;
3783 }
3784
3785 void
3786 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3787 {
3788         struct xdr_stream *xdr = &resp->xdr;
3789         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3790         struct svc_rqst *rqstp = resp->rqstp;
3791         int post_err_offset;
3792         nfsd4_enc encoder;
3793         __be32 *p;
3794
3795         p = xdr_reserve_space(xdr, 8);
3796         if (!p) {
3797                 WARN_ON_ONCE(1);
3798                 return;
3799         }
3800         WRITE32(op->opnum);
3801         post_err_offset = xdr->buf->len;
3802
3803         if (op->opnum == OP_ILLEGAL)
3804                 goto status;
3805         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3806                !nfsd4_enc_ops[op->opnum]);
3807         encoder = nfsd4_enc_ops[op->opnum];
3808         op->status = encoder(resp, op->status, &op->u);
3809         xdr_commit_encode(xdr);
3810
3811         /* nfsd4_check_resp_size guarantees enough room for error status */
3812         if (!op->status) {
3813                 int space_needed = 0;
3814                 if (!nfsd4_last_compound_op(rqstp))
3815                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3816                 op->status = nfsd4_check_resp_size(resp, space_needed);
3817         }
3818         if (op->status == nfserr_resource ||
3819             op->status == nfserr_rep_too_big ||
3820             op->status == nfserr_rep_too_big_to_cache) {
3821                 /*
3822                  * The operation may have already been encoded or
3823                  * partially encoded.  No op returns anything additional
3824                  * in the case of one of these three errors, so we can
3825                  * just truncate back to after the status.  But it's a
3826                  * bug if we had to do this on a non-idempotent op:
3827                  */
3828                 warn_on_nonidempotent_op(op);
3829                 xdr_truncate_encode(xdr, post_err_offset);
3830         }
3831         if (so) {
3832                 int len = xdr->buf->len - post_err_offset;
3833
3834                 so->so_replay.rp_status = op->status;
3835                 so->so_replay.rp_buflen = len;
3836                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3837                                                 so->so_replay.rp_buf, len);
3838         }
3839 status:
3840         /* Note that op->status is already in network byte order: */
3841         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3842 }
3843
3844 /*
3845  * Encode the reply stored in the stateowner reply cache
3846  *
3847  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3848  * previously sent already encoded operation.
3849  *
3850  * called with nfs4_lock_state() held
3851  */
3852 void
3853 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
3854 {
3855         __be32 *p;
3856         struct nfs4_replay *rp = op->replay;
3857
3858         BUG_ON(!rp);
3859
3860         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
3861         if (!p) {
3862                 WARN_ON_ONCE(1);
3863                 return;
3864         }
3865         WRITE32(op->opnum);
3866         *p++ = rp->rp_status;  /* already xdr'ed */
3867
3868         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3869 }
3870
3871 int
3872 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3873 {
3874         return xdr_ressize_check(rqstp, p);
3875 }
3876
3877 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3878 {
3879         struct svc_rqst *rqstp = rq;
3880         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3881
3882         if (args->ops != args->iops) {
3883                 kfree(args->ops);
3884                 args->ops = args->iops;
3885         }
3886         kfree(args->tmpp);
3887         args->tmpp = NULL;
3888         while (args->to_free) {
3889                 struct tmpbuf *tb = args->to_free;
3890                 args->to_free = tb->next;
3891                 tb->release(tb->buf);
3892                 kfree(tb);
3893         }
3894         return 1;
3895 }
3896
3897 int
3898 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3899 {
3900         if (rqstp->rq_arg.head[0].iov_len % 4) {
3901                 /* client is nuts */
3902                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3903                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3904                 return 0;
3905         }
3906         args->p = p;
3907         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3908         args->pagelist = rqstp->rq_arg.pages;
3909         args->pagelen = rqstp->rq_arg.page_len;
3910         args->tmpp = NULL;
3911         args->to_free = NULL;
3912         args->ops = args->iops;
3913         args->rqstp = rqstp;
3914
3915         return !nfsd4_decode_compound(args);
3916 }
3917
3918 int
3919 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3920 {
3921         /*
3922          * All that remains is to write the tag and operation count...
3923          */
3924         struct nfsd4_compound_state *cs = &resp->cstate;
3925         struct xdr_buf *buf = resp->xdr.buf;
3926
3927         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
3928                                  buf->tail[0].iov_len);
3929
3930         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
3931
3932         p = resp->tagp;
3933         *p++ = htonl(resp->taglen);
3934         memcpy(p, resp->tag, resp->taglen);
3935         p += XDR_QUADLEN(resp->taglen);
3936         *p++ = htonl(resp->opcnt);
3937
3938         if (nfsd4_has_session(cs)) {
3939                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3940                 struct nfs4_client *clp = cs->session->se_client;
3941                 if (cs->status != nfserr_replay_cache) {
3942                         nfsd4_store_cache_entry(resp);
3943                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3944                 }
3945                 /* Renew the clientid on success and on replay */
3946                 spin_lock(&nn->client_lock);
3947                 nfsd4_put_session(cs->session);
3948                 spin_unlock(&nn->client_lock);
3949                 put_client_renew(clp);
3950         }
3951         return 1;
3952 }
3953
3954 /*
3955  * Local variables:
3956  *  c-basic-offset: 8
3957  * End:
3958  */