fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/sunrpc/svcauth_gss.h>
  49
  50 #include "idmap.h"
  51 #include "acl.h"
  52 #include "xdr4.h"
  53 #include "vfs.h"
  54 #include "state.h"
  55 #include "cache.h"
  56 #include "netns.h"
  57
  58 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  59 #include <linux/security.h>
  60 #endif
  61
  62
  63 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  64
  65 /*
  66  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  67  * directory in order to indicate to the client that a filesystem boundary is present
  68  * We use a fixed fsid for a referral
  69  */
  70 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  71 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  72
  73 static __be32
  74 check_filename(char *str, int len)
  75 {
  76         int i;
  77
  78         if (len == 0)
  79                 return nfserr_inval;
  80         if (isdotent(str, len))
  81                 return nfserr_badname;
  82         for (i = 0; i < len; i++)
  83                 if (str[i] == '/')
  84                         return nfserr_badname;
  85         return 0;
  86 }
  87
  88 #define DECODE_HEAD                             \
  89         __be32 *p;                              \
  90         __be32 status
  91 #define DECODE_TAIL                             \
  92         status = 0;                             \
  93 out:                                            \
  94         return status;                          \
  95 xdr_error:                                      \
  96         dprintk("NFSD: xdr error (%s:%d)\n",    \
  97                         __FILE__, __LINE__);    \
  98         status = nfserr_bad_xdr;                \
  99         goto out
 100
 101 #define READ32(x)         (x) = ntohl(*p++)
 102 #define READ64(x)         do {                  \
 103         (x) = (u64)ntohl(*p++) << 32;           \
 104         (x) |= ntohl(*p++);                     \
 105 } while (0)
 106 #define READMEM(x,nbytes) do {                  \
 107         x = (char *)p;                          \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define SAVEMEM(x,nbytes) do {                  \
 111         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 112                 savemem(argp, p, nbytes) :      \
 113                 (char *)p)) {                   \
 114                 dprintk("NFSD: xdr error (%s:%d)\n", \
 115                                 __FILE__, __LINE__); \
 116                 goto xdr_error;                 \
 117                 }                               \
 118         p += XDR_QUADLEN(nbytes);               \
 119 } while (0)
 120 #define COPYMEM(x,nbytes) do {                  \
 121         memcpy((x), p, nbytes);                 \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124
 125 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 126 #define READ_BUF(nbytes)  do {                  \
 127         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 128                 p = argp->p;                    \
 129                 argp->p += XDR_QUADLEN(nbytes); \
 130         } else if (!(p = read_buf(argp, nbytes))) { \
 131                 dprintk("NFSD: xdr error (%s:%d)\n", \
 132                                 __FILE__, __LINE__); \
 133                 goto xdr_error;                 \
 134         }                                       \
 135 } while (0)
 136
 137 static void next_decode_page(struct nfsd4_compoundargs *argp)
 138 {
 139         argp->p = page_address(argp->pagelist[0]);
 140         argp->pagelist++;
 141         if (argp->pagelen < PAGE_SIZE) {
 142                 argp->end = argp->p + (argp->pagelen>>2);
 143                 argp->pagelen = 0;
 144         } else {
 145                 argp->end = argp->p + (PAGE_SIZE>>2);
 146                 argp->pagelen -= PAGE_SIZE;
 147         }
 148 }
 149
 150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 151 {
 152         /* We want more bytes than seem to be available.
 153          * Maybe we need a new page, maybe we have just run out
 154          */
 155         unsigned int avail = (char *)argp->end - (char *)argp->p;
 156         __be32 *p;
 157         if (avail + argp->pagelen < nbytes)
 158                 return NULL;
 159         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 160                 return NULL;
 161         /* ok, we can do it with the current plus the next page */
 162         if (nbytes <= sizeof(argp->tmp))
 163                 p = argp->tmp;
 164         else {
 165                 kfree(argp->tmpp);
 166                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 167                 if (!p)
 168                         return NULL;
 169
 170         }
 171         /*
 172          * The following memcpy is safe because read_buf is always
 173          * called with nbytes > avail, and the two cases above both
 174          * guarantee p points to at least nbytes bytes.
 175          */
 176         memcpy(p, argp->p, avail);
 177         next_decode_page(argp);
 178         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 179         argp->p += XDR_QUADLEN(nbytes - avail);
 180         return p;
 181 }
 182
 183 static int zero_clientid(clientid_t *clid)
 184 {
 185         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 186 }
 187
 188 /**
 189  * defer_free - mark an allocation as deferred freed
 190  * @argp: NFSv4 compound argument structure to be freed with
 191  * @release: release callback to free @p, typically kfree()
 192  * @p: pointer to be freed
 193  *
 194  * Marks @p to be freed when processing the compound operation
 195  * described in @argp finishes.
 196  */
 197 static int
 198 defer_free(struct nfsd4_compoundargs *argp,
 199                 void (*release)(const void *), void *p)
 200 {
 201         struct tmpbuf *tb;
 202
 203         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 204         if (!tb)
 205                 return -ENOMEM;
 206         tb->buf = p;
 207         tb->release = release;
 208         tb->next = argp->to_free;
 209         argp->to_free = tb;
 210         return 0;
 211 }
 212
 213 /**
 214  * savemem - duplicate a chunk of memory for later processing
 215  * @argp: NFSv4 compound argument structure to be freed with
 216  * @p: pointer to be duplicated
 217  * @nbytes: length to be duplicated
 218  *
 219  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 220  * that are preserved until processing of the NFSv4 compound
 221  * operation described by @argp finishes.
 222  */
 223 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 224 {
 225         if (p == argp->tmp) {
 226                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 227                 if (!p)
 228                         return NULL;
 229         } else {
 230                 BUG_ON(p != argp->tmpp);
 231                 argp->tmpp = NULL;
 232         }
 233         if (defer_free(argp, kfree, p)) {
 234                 kfree(p);
 235                 return NULL;
 236         } else
 237                 return (char *)p;
 238 }
 239
 240 static __be32
 241 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 242 {
 243         u32 bmlen;
 244         DECODE_HEAD;
 245
 246         bmval[0] = 0;
 247         bmval[1] = 0;
 248         bmval[2] = 0;
 249
 250         READ_BUF(4);
 251         READ32(bmlen);
 252         if (bmlen > 1000)
 253                 goto xdr_error;
 254
 255         READ_BUF(bmlen << 2);
 256         if (bmlen > 0)
 257                 READ32(bmval[0]);
 258         if (bmlen > 1)
 259                 READ32(bmval[1]);
 260         if (bmlen > 2)
 261                 READ32(bmval[2]);
 262
 263         DECODE_TAIL;
 264 }
 265
 266 static __be32
 267 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 268                    struct iattr *iattr, struct nfs4_acl **acl,
 269                    struct xdr_netobj *label)
 270 {
 271         int expected_len, len = 0;
 272         u32 dummy32;
 273         char *buf;
 274
 275         DECODE_HEAD;
 276         iattr->ia_valid = 0;
 277         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 278                 return status;
 279
 280         READ_BUF(4);
 281         READ32(expected_len);
 282
 283         if (bmval[0] & FATTR4_WORD0_SIZE) {
 284                 READ_BUF(8);
 285                 len += 8;
 286                 READ64(iattr->ia_size);
 287                 iattr->ia_valid |= ATTR_SIZE;
 288         }
 289         if (bmval[0] & FATTR4_WORD0_ACL) {
 290                 u32 nace;
 291                 struct nfs4_ace *ace;
 292
 293                 READ_BUF(4); len += 4;
 294                 READ32(nace);
 295
 296                 if (nace > NFS4_ACL_MAX)
 297                         return nfserr_fbig;
 298
 299                 *acl = nfs4_acl_new(nace);
 300                 if (*acl == NULL)
 301                         return nfserr_jukebox;
 302
 303                 defer_free(argp, kfree, *acl);
 304
 305                 (*acl)->naces = nace;
 306                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 307                         READ_BUF(16); len += 16;
 308                         READ32(ace->type);
 309                         READ32(ace->flag);
 310                         READ32(ace->access_mask);
 311                         READ32(dummy32);
 312                         READ_BUF(dummy32);
 313                         len += XDR_QUADLEN(dummy32) << 2;
 314                         READMEM(buf, dummy32);
 315                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 316                         status = nfs_ok;
 317                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 318                                 ;
 319                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 320                                 status = nfsd_map_name_to_gid(argp->rqstp,
 321                                                 buf, dummy32, &ace->who_gid);
 322                         else
 323                                 status = nfsd_map_name_to_uid(argp->rqstp,
 324                                                 buf, dummy32, &ace->who_uid);
 325                         if (status)
 326                                 return status;
 327                 }
 328         } else
 329                 *acl = NULL;
 330         if (bmval[1] & FATTR4_WORD1_MODE) {
 331                 READ_BUF(4);
 332                 len += 4;
 333                 READ32(iattr->ia_mode);
 334                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 335                 iattr->ia_valid |= ATTR_MODE;
 336         }
 337         if (bmval[1] & FATTR4_WORD1_OWNER) {
 338                 READ_BUF(4);
 339                 len += 4;
 340                 READ32(dummy32);
 341                 READ_BUF(dummy32);
 342                 len += (XDR_QUADLEN(dummy32) << 2);
 343                 READMEM(buf, dummy32);
 344                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 345                         return status;
 346                 iattr->ia_valid |= ATTR_UID;
 347         }
 348         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 349                 READ_BUF(4);
 350                 len += 4;
 351                 READ32(dummy32);
 352                 READ_BUF(dummy32);
 353                 len += (XDR_QUADLEN(dummy32) << 2);
 354                 READMEM(buf, dummy32);
 355                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 356                         return status;
 357                 iattr->ia_valid |= ATTR_GID;
 358         }
 359         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 360                 READ_BUF(4);
 361                 len += 4;
 362                 READ32(dummy32);
 363                 switch (dummy32) {
 364                 case NFS4_SET_TO_CLIENT_TIME:
 365                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 366                            all 32 bits of 'nseconds'. */
 367                         READ_BUF(12);
 368                         len += 12;
 369                         READ64(iattr->ia_atime.tv_sec);
 370                         READ32(iattr->ia_atime.tv_nsec);
 371                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 372                                 return nfserr_inval;
 373                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 374                         break;
 375                 case NFS4_SET_TO_SERVER_TIME:
 376                         iattr->ia_valid |= ATTR_ATIME;
 377                         break;
 378                 default:
 379                         goto xdr_error;
 380                 }
 381         }
 382         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 383                 READ_BUF(4);
 384                 len += 4;
 385                 READ32(dummy32);
 386                 switch (dummy32) {
 387                 case NFS4_SET_TO_CLIENT_TIME:
 388                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 389                            all 32 bits of 'nseconds'. */
 390                         READ_BUF(12);
 391                         len += 12;
 392                         READ64(iattr->ia_mtime.tv_sec);
 393                         READ32(iattr->ia_mtime.tv_nsec);
 394                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 395                                 return nfserr_inval;
 396                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 397                         break;
 398                 case NFS4_SET_TO_SERVER_TIME:
 399                         iattr->ia_valid |= ATTR_MTIME;
 400                         break;
 401                 default:
 402                         goto xdr_error;
 403                 }
 404         }
 405
 406         label->len = 0;
 407 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 408         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 409                 READ_BUF(4);
 410                 len += 4;
 411                 READ32(dummy32); /* lfs: we don't use it */
 412                 READ_BUF(4);
 413                 len += 4;
 414                 READ32(dummy32); /* pi: we don't use it either */
 415                 READ_BUF(4);
 416                 len += 4;
 417                 READ32(dummy32);
 418                 READ_BUF(dummy32);
 419                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 420                         return nfserr_badlabel;
 421                 len += (XDR_QUADLEN(dummy32) << 2);
 422                 READMEM(buf, dummy32);
 423                 label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
 424                 if (!label->data)
 425                         return nfserr_jukebox;
 426                 label->len = dummy32;
 427                 defer_free(argp, kfree, label->data);
 428                 memcpy(label->data, buf, dummy32);
 429         }
 430 #endif
 431
 432         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 433             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 434             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 435                 READ_BUF(expected_len - len);
 436         else if (len != expected_len)
 437                 goto xdr_error;
 438
 439         DECODE_TAIL;
 440 }
 441
 442 static __be32
 443 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 444 {
 445         DECODE_HEAD;
 446
 447         READ_BUF(sizeof(stateid_t));
 448         READ32(sid->si_generation);
 449         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 450
 451         DECODE_TAIL;
 452 }
 453
 454 static __be32
 455 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 456 {
 457         DECODE_HEAD;
 458
 459         READ_BUF(4);
 460         READ32(access->ac_req_access);
 461
 462         DECODE_TAIL;
 463 }
 464
 465 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 466 {
 467         DECODE_HEAD;
 468         u32 dummy, uid, gid;
 469         char *machine_name;
 470         int i;
 471         int nr_secflavs;
 472
 473         /* callback_sec_params4 */
 474         READ_BUF(4);
 475         READ32(nr_secflavs);
 476         if (nr_secflavs)
 477                 cbs->flavor = (u32)(-1);
 478         else
 479                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 480                 cbs->flavor = 0;
 481         for (i = 0; i < nr_secflavs; ++i) {
 482                 READ_BUF(4);
 483                 READ32(dummy);
 484                 switch (dummy) {
 485                 case RPC_AUTH_NULL:
 486                         /* Nothing to read */
 487                         if (cbs->flavor == (u32)(-1))
 488                                 cbs->flavor = RPC_AUTH_NULL;
 489                         break;
 490                 case RPC_AUTH_UNIX:
 491                         READ_BUF(8);
 492                         /* stamp */
 493                         READ32(dummy);
 494
 495                         /* machine name */
 496                         READ32(dummy);
 497                         READ_BUF(dummy);
 498                         SAVEMEM(machine_name, dummy);
 499
 500                         /* uid, gid */
 501                         READ_BUF(8);
 502                         READ32(uid);
 503                         READ32(gid);
 504
 505                         /* more gids */
 506                         READ_BUF(4);
 507                         READ32(dummy);
 508                         READ_BUF(dummy * 4);
 509                         if (cbs->flavor == (u32)(-1)) {
 510                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 511                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 512                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 513                                         cbs->uid = kuid;
 514                                         cbs->gid = kgid;
 515                                         cbs->flavor = RPC_AUTH_UNIX;
 516                                 } else {
 517                                         dprintk("RPC_AUTH_UNIX with invalid"
 518                                                 "uid or gid ignoring!\n");
 519                                 }
 520                         }
 521                         break;
 522                 case RPC_AUTH_GSS:
 523                         dprintk("RPC_AUTH_GSS callback secflavor "
 524                                 "not supported!\n");
 525                         READ_BUF(8);
 526                         /* gcbp_service */
 527                         READ32(dummy);
 528                         /* gcbp_handle_from_server */
 529                         READ32(dummy);
 530                         READ_BUF(dummy);
 531                         p += XDR_QUADLEN(dummy);
 532                         /* gcbp_handle_from_client */
 533                         READ_BUF(4);
 534                         READ32(dummy);
 535                         READ_BUF(dummy);
 536                         break;
 537                 default:
 538                         dprintk("Illegal callback secflavor\n");
 539                         return nfserr_inval;
 540                 }
 541         }
 542         DECODE_TAIL;
 543 }
 544
 545 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 546 {
 547         DECODE_HEAD;
 548
 549         READ_BUF(4);
 550         READ32(bc->bc_cb_program);
 551         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 552
 553         DECODE_TAIL;
 554 }
 555
 556 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 557 {
 558         DECODE_HEAD;
 559
 560         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 561         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 562         READ32(bcts->dir);
 563         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 564          * could help us figure out we should be using it. */
 565         DECODE_TAIL;
 566 }
 567
 568 static __be32
 569 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 570 {
 571         DECODE_HEAD;
 572
 573         READ_BUF(4);
 574         READ32(close->cl_seqid);
 575         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 576
 577         DECODE_TAIL;
 578 }
 579
 580
 581 static __be32
 582 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 583 {
 584         DECODE_HEAD;
 585
 586         READ_BUF(12);
 587         READ64(commit->co_offset);
 588         READ32(commit->co_count);
 589
 590         DECODE_TAIL;
 591 }
 592
 593 static __be32
 594 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 595 {
 596         DECODE_HEAD;
 597
 598         READ_BUF(4);
 599         READ32(create->cr_type);
 600         switch (create->cr_type) {
 601         case NF4LNK:
 602                 READ_BUF(4);
 603                 READ32(create->cr_linklen);
 604                 READ_BUF(create->cr_linklen);
 605                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 606                 break;
 607         case NF4BLK:
 608         case NF4CHR:
 609                 READ_BUF(8);
 610                 READ32(create->cr_specdata1);
 611                 READ32(create->cr_specdata2);
 612                 break;
 613         case NF4SOCK:
 614         case NF4FIFO:
 615         case NF4DIR:
 616         default:
 617                 break;
 618         }
 619
 620         READ_BUF(4);
 621         READ32(create->cr_namelen);
 622         READ_BUF(create->cr_namelen);
 623         SAVEMEM(create->cr_name, create->cr_namelen);
 624         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 625                 return status;
 626
 627         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 628                                     &create->cr_acl, &create->cr_label);
 629         if (status)
 630                 goto out;
 631
 632         DECODE_TAIL;
 633 }
 634
 635 static inline __be32
 636 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 637 {
 638         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 639 }
 640
 641 static inline __be32
 642 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 643 {
 644         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 645 }
 646
 647 static __be32
 648 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 649 {
 650         DECODE_HEAD;
 651
 652         READ_BUF(4);
 653         READ32(link->li_namelen);
 654         READ_BUF(link->li_namelen);
 655         SAVEMEM(link->li_name, link->li_namelen);
 656         if ((status = check_filename(link->li_name, link->li_namelen)))
 657                 return status;
 658
 659         DECODE_TAIL;
 660 }
 661
 662 static __be32
 663 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 664 {
 665         DECODE_HEAD;
 666
 667         /*
 668         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 669         */
 670         READ_BUF(28);
 671         READ32(lock->lk_type);
 672         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 673                 goto xdr_error;
 674         READ32(lock->lk_reclaim);
 675         READ64(lock->lk_offset);
 676         READ64(lock->lk_length);
 677         READ32(lock->lk_is_new);
 678
 679         if (lock->lk_is_new) {
 680                 READ_BUF(4);
 681                 READ32(lock->lk_new_open_seqid);
 682                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 683                 if (status)
 684                         return status;
 685                 READ_BUF(8 + sizeof(clientid_t));
 686                 READ32(lock->lk_new_lock_seqid);
 687                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 688                 READ32(lock->lk_new_owner.len);
 689                 READ_BUF(lock->lk_new_owner.len);
 690                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 691         } else {
 692                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 693                 if (status)
 694                         return status;
 695                 READ_BUF(4);
 696                 READ32(lock->lk_old_lock_seqid);
 697         }
 698
 699         DECODE_TAIL;
 700 }
 701
 702 static __be32
 703 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 704 {
 705         DECODE_HEAD;
 706
 707         READ_BUF(32);
 708         READ32(lockt->lt_type);
 709         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 710                 goto xdr_error;
 711         READ64(lockt->lt_offset);
 712         READ64(lockt->lt_length);
 713         COPYMEM(&lockt->lt_clientid, 8);
 714         READ32(lockt->lt_owner.len);
 715         READ_BUF(lockt->lt_owner.len);
 716         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 717
 718         DECODE_TAIL;
 719 }
 720
 721 static __be32
 722 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 723 {
 724         DECODE_HEAD;
 725
 726         READ_BUF(8);
 727         READ32(locku->lu_type);
 728         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 729                 goto xdr_error;
 730         READ32(locku->lu_seqid);
 731         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 732         if (status)
 733                 return status;
 734         READ_BUF(16);
 735         READ64(locku->lu_offset);
 736         READ64(locku->lu_length);
 737
 738         DECODE_TAIL;
 739 }
 740
 741 static __be32
 742 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 743 {
 744         DECODE_HEAD;
 745
 746         READ_BUF(4);
 747         READ32(lookup->lo_len);
 748         READ_BUF(lookup->lo_len);
 749         SAVEMEM(lookup->lo_name, lookup->lo_len);
 750         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 751                 return status;
 752
 753         DECODE_TAIL;
 754 }
 755
 756 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 757 {
 758         __be32 *p;
 759         u32 w;
 760
 761         READ_BUF(4);
 762         READ32(w);
 763         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 764         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 765         if (deleg_when)
 766                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 767
 768         switch (w & NFS4_SHARE_ACCESS_MASK) {
 769         case NFS4_SHARE_ACCESS_READ:
 770         case NFS4_SHARE_ACCESS_WRITE:
 771         case NFS4_SHARE_ACCESS_BOTH:
 772                 break;
 773         default:
 774                 return nfserr_bad_xdr;
 775         }
 776         w &= ~NFS4_SHARE_ACCESS_MASK;
 777         if (!w)
 778                 return nfs_ok;
 779         if (!argp->minorversion)
 780                 return nfserr_bad_xdr;
 781         switch (w & NFS4_SHARE_WANT_MASK) {
 782         case NFS4_SHARE_WANT_NO_PREFERENCE:
 783         case NFS4_SHARE_WANT_READ_DELEG:
 784         case NFS4_SHARE_WANT_WRITE_DELEG:
 785         case NFS4_SHARE_WANT_ANY_DELEG:
 786         case NFS4_SHARE_WANT_NO_DELEG:
 787         case NFS4_SHARE_WANT_CANCEL:
 788                 break;
 789         default:
 790                 return nfserr_bad_xdr;
 791         }
 792         w &= ~NFS4_SHARE_WANT_MASK;
 793         if (!w)
 794                 return nfs_ok;
 795
 796         if (!deleg_when)        /* open_downgrade */
 797                 return nfserr_inval;
 798         switch (w) {
 799         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 800         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 801         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 802               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 803                 return nfs_ok;
 804         }
 805 xdr_error:
 806         return nfserr_bad_xdr;
 807 }
 808
 809 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 810 {
 811         __be32 *p;
 812
 813         READ_BUF(4);
 814         READ32(*x);
 815         /* Note: unlinke access bits, deny bits may be zero. */
 816         if (*x & ~NFS4_SHARE_DENY_BOTH)
 817                 return nfserr_bad_xdr;
 818         return nfs_ok;
 819 xdr_error:
 820         return nfserr_bad_xdr;
 821 }
 822
 823 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 824 {
 825         __be32 *p;
 826
 827         READ_BUF(4);
 828         READ32(o->len);
 829
 830         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 831                 return nfserr_bad_xdr;
 832
 833         READ_BUF(o->len);
 834         SAVEMEM(o->data, o->len);
 835         return nfs_ok;
 836 xdr_error:
 837         return nfserr_bad_xdr;
 838 }
 839
 840 static __be32
 841 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 842 {
 843         DECODE_HEAD;
 844         u32 dummy;
 845
 846         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 847         open->op_iattr.ia_valid = 0;
 848         open->op_openowner = NULL;
 849
 850         open->op_xdr_error = 0;
 851         /* seqid, share_access, share_deny, clientid, ownerlen */
 852         READ_BUF(4);
 853         READ32(open->op_seqid);
 854         /* decode, yet ignore deleg_when until supported */
 855         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 856                                            &open->op_deleg_want, &dummy);
 857         if (status)
 858                 goto xdr_error;
 859         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 860         if (status)
 861                 goto xdr_error;
 862         READ_BUF(sizeof(clientid_t));
 863         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 864         status = nfsd4_decode_opaque(argp, &open->op_owner);
 865         if (status)
 866                 goto xdr_error;
 867         READ_BUF(4);
 868         READ32(open->op_create);
 869         switch (open->op_create) {
 870         case NFS4_OPEN_NOCREATE:
 871                 break;
 872         case NFS4_OPEN_CREATE:
 873                 READ_BUF(4);
 874                 READ32(open->op_createmode);
 875                 switch (open->op_createmode) {
 876                 case NFS4_CREATE_UNCHECKED:
 877                 case NFS4_CREATE_GUARDED:
 878                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 879                                 &open->op_iattr, &open->op_acl, &open->op_label);
 880                         if (status)
 881                                 goto out;
 882                         break;
 883                 case NFS4_CREATE_EXCLUSIVE:
 884                         READ_BUF(NFS4_VERIFIER_SIZE);
 885                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 886                         break;
 887                 case NFS4_CREATE_EXCLUSIVE4_1:
 888                         if (argp->minorversion < 1)
 889                                 goto xdr_error;
 890                         READ_BUF(NFS4_VERIFIER_SIZE);
 891                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 892                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 893                                 &open->op_iattr, &open->op_acl, &open->op_label);
 894                         if (status)
 895                                 goto out;
 896                         break;
 897                 default:
 898                         goto xdr_error;
 899                 }
 900                 break;
 901         default:
 902                 goto xdr_error;
 903         }
 904
 905         /* open_claim */
 906         READ_BUF(4);
 907         READ32(open->op_claim_type);
 908         switch (open->op_claim_type) {
 909         case NFS4_OPEN_CLAIM_NULL:
 910         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 911                 READ_BUF(4);
 912                 READ32(open->op_fname.len);
 913                 READ_BUF(open->op_fname.len);
 914                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 915                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 916                         return status;
 917                 break;
 918         case NFS4_OPEN_CLAIM_PREVIOUS:
 919                 READ_BUF(4);
 920                 READ32(open->op_delegate_type);
 921                 break;
 922         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 923                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 924                 if (status)
 925                         return status;
 926                 READ_BUF(4);
 927                 READ32(open->op_fname.len);
 928                 READ_BUF(open->op_fname.len);
 929                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 930                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 931                         return status;
 932                 break;
 933         case NFS4_OPEN_CLAIM_FH:
 934         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 935                 if (argp->minorversion < 1)
 936                         goto xdr_error;
 937                 /* void */
 938                 break;
 939         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 940                 if (argp->minorversion < 1)
 941                         goto xdr_error;
 942                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 943                 if (status)
 944                         return status;
 945                 break;
 946         default:
 947                 goto xdr_error;
 948         }
 949
 950         DECODE_TAIL;
 951 }
 952
 953 static __be32
 954 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 955 {
 956         DECODE_HEAD;
 957
 958         if (argp->minorversion >= 1)
 959                 return nfserr_notsupp;
 960
 961         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 962         if (status)
 963                 return status;
 964         READ_BUF(4);
 965         READ32(open_conf->oc_seqid);
 966
 967         DECODE_TAIL;
 968 }
 969
 970 static __be32
 971 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 972 {
 973         DECODE_HEAD;
 974
 975         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 976         if (status)
 977                 return status;
 978         READ_BUF(4);
 979         READ32(open_down->od_seqid);
 980         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 981                                            &open_down->od_deleg_want, NULL);
 982         if (status)
 983                 return status;
 984         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 985         if (status)
 986                 return status;
 987         DECODE_TAIL;
 988 }
 989
 990 static __be32
 991 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 992 {
 993         DECODE_HEAD;
 994
 995         READ_BUF(4);
 996         READ32(putfh->pf_fhlen);
 997         if (putfh->pf_fhlen > NFS4_FHSIZE)
 998                 goto xdr_error;
 999         READ_BUF(putfh->pf_fhlen);
1000         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1001
1002         DECODE_TAIL;
1003 }
1004
1005 static __be32
1006 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1007 {
1008         if (argp->minorversion == 0)
1009                 return nfs_ok;
1010         return nfserr_notsupp;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1015 {
1016         DECODE_HEAD;
1017
1018         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1019         if (status)
1020                 return status;
1021         READ_BUF(12);
1022         READ64(read->rd_offset);
1023         READ32(read->rd_length);
1024
1025         DECODE_TAIL;
1026 }
1027
1028 static __be32
1029 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1030 {
1031         DECODE_HEAD;
1032
1033         READ_BUF(24);
1034         READ64(readdir->rd_cookie);
1035         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1036         READ32(readdir->rd_dircount);
1037         READ32(readdir->rd_maxcount);
1038         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1039                 goto out;
1040
1041         DECODE_TAIL;
1042 }
1043
1044 static __be32
1045 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1046 {
1047         DECODE_HEAD;
1048
1049         READ_BUF(4);
1050         READ32(remove->rm_namelen);
1051         READ_BUF(remove->rm_namelen);
1052         SAVEMEM(remove->rm_name, remove->rm_namelen);
1053         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1054                 return status;
1055
1056         DECODE_TAIL;
1057 }
1058
1059 static __be32
1060 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1061 {
1062         DECODE_HEAD;
1063
1064         READ_BUF(4);
1065         READ32(rename->rn_snamelen);
1066         READ_BUF(rename->rn_snamelen + 4);
1067         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1068         READ32(rename->rn_tnamelen);
1069         READ_BUF(rename->rn_tnamelen);
1070         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1071         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1072                 return status;
1073         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1074                 return status;
1075
1076         DECODE_TAIL;
1077 }
1078
1079 static __be32
1080 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1081 {
1082         DECODE_HEAD;
1083
1084         if (argp->minorversion >= 1)
1085                 return nfserr_notsupp;
1086
1087         READ_BUF(sizeof(clientid_t));
1088         COPYMEM(clientid, sizeof(clientid_t));
1089
1090         DECODE_TAIL;
1091 }
1092
1093 static __be32
1094 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1095                      struct nfsd4_secinfo *secinfo)
1096 {
1097         DECODE_HEAD;
1098
1099         READ_BUF(4);
1100         READ32(secinfo->si_namelen);
1101         READ_BUF(secinfo->si_namelen);
1102         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1103         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1104         if (status)
1105                 return status;
1106         DECODE_TAIL;
1107 }
1108
1109 static __be32
1110 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1111                      struct nfsd4_secinfo_no_name *sin)
1112 {
1113         DECODE_HEAD;
1114
1115         READ_BUF(4);
1116         READ32(sin->sin_style);
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1122 {
1123         __be32 status;
1124
1125         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1126         if (status)
1127                 return status;
1128         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1129                                   &setattr->sa_acl, &setattr->sa_label);
1130 }
1131
1132 static __be32
1133 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1134 {
1135         DECODE_HEAD;
1136
1137         if (argp->minorversion >= 1)
1138                 return nfserr_notsupp;
1139
1140         READ_BUF(NFS4_VERIFIER_SIZE);
1141         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1142
1143         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1144         if (status)
1145                 return nfserr_bad_xdr;
1146         READ_BUF(8);
1147         READ32(setclientid->se_callback_prog);
1148         READ32(setclientid->se_callback_netid_len);
1149
1150         READ_BUF(setclientid->se_callback_netid_len + 4);
1151         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1152         READ32(setclientid->se_callback_addr_len);
1153
1154         READ_BUF(setclientid->se_callback_addr_len + 4);
1155         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1156         READ32(setclientid->se_callback_ident);
1157
1158         DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1163 {
1164         DECODE_HEAD;
1165
1166         if (argp->minorversion >= 1)
1167                 return nfserr_notsupp;
1168
1169         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1170         COPYMEM(&scd_c->sc_clientid, 8);
1171         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1172
1173         DECODE_TAIL;
1174 }
1175
1176 /* Also used for NVERIFY */
1177 static __be32
1178 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1179 {
1180         DECODE_HEAD;
1181
1182         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1183                 goto out;
1184
1185         /* For convenience's sake, we compare raw xdr'd attributes in
1186          * nfsd4_proc_verify */
1187
1188         READ_BUF(4);
1189         READ32(verify->ve_attrlen);
1190         READ_BUF(verify->ve_attrlen);
1191         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1192
1193         DECODE_TAIL;
1194 }
1195
1196 static __be32
1197 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1198 {
1199         int avail;
1200         int len;
1201         DECODE_HEAD;
1202
1203         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1204         if (status)
1205                 return status;
1206         READ_BUF(16);
1207         READ64(write->wr_offset);
1208         READ32(write->wr_stable_how);
1209         if (write->wr_stable_how > 2)
1210                 goto xdr_error;
1211         READ32(write->wr_buflen);
1212
1213         /* Sorry .. no magic macros for this.. *
1214          * READ_BUF(write->wr_buflen);
1215          * SAVEMEM(write->wr_buf, write->wr_buflen);
1216          */
1217         avail = (char*)argp->end - (char*)argp->p;
1218         if (avail + argp->pagelen < write->wr_buflen) {
1219                 dprintk("NFSD: xdr error (%s:%d)\n",
1220                                 __FILE__, __LINE__);
1221                 goto xdr_error;
1222         }
1223         write->wr_head.iov_base = p;
1224         write->wr_head.iov_len = avail;
1225         write->wr_pagelist = argp->pagelist;
1226
1227         len = XDR_QUADLEN(write->wr_buflen) << 2;
1228         if (len >= avail) {
1229                 int pages;
1230
1231                 len -= avail;
1232
1233                 pages = len >> PAGE_SHIFT;
1234                 argp->pagelist += pages;
1235                 argp->pagelen -= pages * PAGE_SIZE;
1236                 len -= pages * PAGE_SIZE;
1237
1238                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1239                 argp->pagelist++;
1240                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1241         }
1242         argp->p += XDR_QUADLEN(len);
1243
1244         DECODE_TAIL;
1245 }
1246
1247 static __be32
1248 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1249 {
1250         DECODE_HEAD;
1251
1252         if (argp->minorversion >= 1)
1253                 return nfserr_notsupp;
1254
1255         READ_BUF(12);
1256         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1257         READ32(rlockowner->rl_owner.len);
1258         READ_BUF(rlockowner->rl_owner.len);
1259         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1260
1261         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1262                 return nfserr_inval;
1263         DECODE_TAIL;
1264 }
1265
1266 static __be32
1267 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1268                          struct nfsd4_exchange_id *exid)
1269 {
1270         int dummy, tmp;
1271         DECODE_HEAD;
1272
1273         READ_BUF(NFS4_VERIFIER_SIZE);
1274         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1275
1276         status = nfsd4_decode_opaque(argp, &exid->clname);
1277         if (status)
1278                 return nfserr_bad_xdr;
1279
1280         READ_BUF(4);
1281         READ32(exid->flags);
1282
1283         /* Ignore state_protect4_a */
1284         READ_BUF(4);
1285         READ32(exid->spa_how);
1286         switch (exid->spa_how) {
1287         case SP4_NONE:
1288                 break;
1289         case SP4_MACH_CRED:
1290                 /* spo_must_enforce */
1291                 READ_BUF(4);
1292                 READ32(dummy);
1293                 READ_BUF(dummy * 4);
1294                 p += dummy;
1295
1296                 /* spo_must_allow */
1297                 READ_BUF(4);
1298                 READ32(dummy);
1299                 READ_BUF(dummy * 4);
1300                 p += dummy;
1301                 break;
1302         case SP4_SSV:
1303                 /* ssp_ops */
1304                 READ_BUF(4);
1305                 READ32(dummy);
1306                 READ_BUF(dummy * 4);
1307                 p += dummy;
1308
1309                 READ_BUF(4);
1310                 READ32(dummy);
1311                 READ_BUF(dummy * 4);
1312                 p += dummy;
1313
1314                 /* ssp_hash_algs<> */
1315                 READ_BUF(4);
1316                 READ32(tmp);
1317                 while (tmp--) {
1318                         READ_BUF(4);
1319                         READ32(dummy);
1320                         READ_BUF(dummy);
1321                         p += XDR_QUADLEN(dummy);
1322                 }
1323
1324                 /* ssp_encr_algs<> */
1325                 READ_BUF(4);
1326                 READ32(tmp);
1327                 while (tmp--) {
1328                         READ_BUF(4);
1329                         READ32(dummy);
1330                         READ_BUF(dummy);
1331                         p += XDR_QUADLEN(dummy);
1332                 }
1333
1334                 /* ssp_window and ssp_num_gss_handles */
1335                 READ_BUF(8);
1336                 READ32(dummy);
1337                 READ32(dummy);
1338                 break;
1339         default:
1340                 goto xdr_error;
1341         }
1342
1343         /* Ignore Implementation ID */
1344         READ_BUF(4);    /* nfs_impl_id4 array length */
1345         READ32(dummy);
1346
1347         if (dummy > 1)
1348                 goto xdr_error;
1349
1350         if (dummy == 1) {
1351                 /* nii_domain */
1352                 READ_BUF(4);
1353                 READ32(dummy);
1354                 READ_BUF(dummy);
1355                 p += XDR_QUADLEN(dummy);
1356
1357                 /* nii_name */
1358                 READ_BUF(4);
1359                 READ32(dummy);
1360                 READ_BUF(dummy);
1361                 p += XDR_QUADLEN(dummy);
1362
1363                 /* nii_date */
1364                 READ_BUF(12);
1365                 p += 3;
1366         }
1367         DECODE_TAIL;
1368 }
1369
1370 static __be32
1371 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1372                             struct nfsd4_create_session *sess)
1373 {
1374         DECODE_HEAD;
1375         u32 dummy;
1376
1377         READ_BUF(16);
1378         COPYMEM(&sess->clientid, 8);
1379         READ32(sess->seqid);
1380         READ32(sess->flags);
1381
1382         /* Fore channel attrs */
1383         READ_BUF(28);
1384         READ32(dummy); /* headerpadsz is always 0 */
1385         READ32(sess->fore_channel.maxreq_sz);
1386         READ32(sess->fore_channel.maxresp_sz);
1387         READ32(sess->fore_channel.maxresp_cached);
1388         READ32(sess->fore_channel.maxops);
1389         READ32(sess->fore_channel.maxreqs);
1390         READ32(sess->fore_channel.nr_rdma_attrs);
1391         if (sess->fore_channel.nr_rdma_attrs == 1) {
1392                 READ_BUF(4);
1393                 READ32(sess->fore_channel.rdma_attrs);
1394         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1395                 dprintk("Too many fore channel attr bitmaps!\n");
1396                 goto xdr_error;
1397         }
1398
1399         /* Back channel attrs */
1400         READ_BUF(28);
1401         READ32(dummy); /* headerpadsz is always 0 */
1402         READ32(sess->back_channel.maxreq_sz);
1403         READ32(sess->back_channel.maxresp_sz);
1404         READ32(sess->back_channel.maxresp_cached);
1405         READ32(sess->back_channel.maxops);
1406         READ32(sess->back_channel.maxreqs);
1407         READ32(sess->back_channel.nr_rdma_attrs);
1408         if (sess->back_channel.nr_rdma_attrs == 1) {
1409                 READ_BUF(4);
1410                 READ32(sess->back_channel.rdma_attrs);
1411         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1412                 dprintk("Too many back channel attr bitmaps!\n");
1413                 goto xdr_error;
1414         }
1415
1416         READ_BUF(4);
1417         READ32(sess->callback_prog);
1418         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1419         DECODE_TAIL;
1420 }
1421
1422 static __be32
1423 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1424                              struct nfsd4_destroy_session *destroy_session)
1425 {
1426         DECODE_HEAD;
1427         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1428         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1429
1430         DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1435                           struct nfsd4_free_stateid *free_stateid)
1436 {
1437         DECODE_HEAD;
1438
1439         READ_BUF(sizeof(stateid_t));
1440         READ32(free_stateid->fr_stateid.si_generation);
1441         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1442
1443         DECODE_TAIL;
1444 }
1445
1446 static __be32
1447 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1448                       struct nfsd4_sequence *seq)
1449 {
1450         DECODE_HEAD;
1451
1452         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1453         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1454         READ32(seq->seqid);
1455         READ32(seq->slotid);
1456         READ32(seq->maxslots);
1457         READ32(seq->cachethis);
1458
1459         DECODE_TAIL;
1460 }
1461
1462 static __be32
1463 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1464 {
1465         int i;
1466         __be32 *p, status;
1467         struct nfsd4_test_stateid_id *stateid;
1468
1469         READ_BUF(4);
1470         test_stateid->ts_num_ids = ntohl(*p++);
1471
1472         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1473
1474         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1475                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1476                 if (!stateid) {
1477                         status = nfserrno(-ENOMEM);
1478                         goto out;
1479                 }
1480
1481                 defer_free(argp, kfree, stateid);
1482                 INIT_LIST_HEAD(&stateid->ts_id_list);
1483                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1484
1485                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1486                 if (status)
1487                         goto out;
1488         }
1489
1490         status = 0;
1491 out:
1492         return status;
1493 xdr_error:
1494         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1495         status = nfserr_bad_xdr;
1496         goto out;
1497 }
1498
1499 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1500 {
1501         DECODE_HEAD;
1502
1503         READ_BUF(8);
1504         COPYMEM(&dc->clientid, 8);
1505
1506         DECODE_TAIL;
1507 }
1508
1509 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1510 {
1511         DECODE_HEAD;
1512
1513         READ_BUF(4);
1514         READ32(rc->rca_one_fs);
1515
1516         DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1521 {
1522         return nfs_ok;
1523 }
1524
1525 static __be32
1526 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1527 {
1528         return nfserr_notsupp;
1529 }
1530
1531 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1532
1533 static nfsd4_dec nfsd4_dec_ops[] = {
1534         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1535         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1536         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1537         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1538         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1539         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1540         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1541         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1542         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1543         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1544         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1545         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1546         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1547         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1548         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1549         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1550         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1551         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1552         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1553         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1554         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1555         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1556         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1557         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1558         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1559         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1560         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1561         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1562         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1563         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1564         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1565         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1566         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1567         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1568         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1569         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1570         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1571
1572         /* new operations for NFSv4.1 */
1573         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1574         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1575         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1576         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1577         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1578         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1579         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1580         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1582         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1583         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1584         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1585         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1586         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1587         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1588         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1589         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1590         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1591         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1592 };
1593
1594 static inline bool
1595 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1596 {
1597         if (op->opnum < FIRST_NFS4_OP)
1598                 return false;
1599         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1600                 return false;
1601         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1602                 return false;
1603         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1604                 return false;
1605         return true;
1606 }
1607
1608 static __be32
1609 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1610 {
1611         DECODE_HEAD;
1612         struct nfsd4_op *op;
1613         bool cachethis = false;
1614         int max_reply = 2 * RPC_MAX_AUTH_SIZE + 8; /* opcnt, status */
1615         int readcount = 0;
1616         int readbytes = 0;
1617         int i;
1618
1619         READ_BUF(4);
1620         READ32(argp->taglen);
1621         READ_BUF(argp->taglen + 8);
1622         SAVEMEM(argp->tag, argp->taglen);
1623         READ32(argp->minorversion);
1624         READ32(argp->opcnt);
1625         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1626
1627         if (argp->taglen > NFSD4_MAX_TAGLEN)
1628                 goto xdr_error;
1629         if (argp->opcnt > 100)
1630                 goto xdr_error;
1631
1632         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1633                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1634                 if (!argp->ops) {
1635                         argp->ops = argp->iops;
1636                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1637                         goto xdr_error;
1638                 }
1639         }
1640
1641         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1642                 argp->opcnt = 0;
1643
1644         for (i = 0; i < argp->opcnt; i++) {
1645                 op = &argp->ops[i];
1646                 op->replay = NULL;
1647
1648                 READ_BUF(4);
1649                 READ32(op->opnum);
1650
1651                 if (nfsd4_opnum_in_range(argp, op))
1652                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1653                 else {
1654                         op->opnum = OP_ILLEGAL;
1655                         op->status = nfserr_op_illegal;
1656                 }
1657                 /*
1658                  * We'll try to cache the result in the DRC if any one
1659                  * op in the compound wants to be cached:
1660                  */
1661                 cachethis |= nfsd4_cache_this_op(op);
1662
1663                 if (op->opnum == OP_READ) {
1664                         readcount++;
1665                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1666                 } else
1667                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1668
1669                 if (op->status) {
1670                         argp->opcnt = i+1;
1671                         break;
1672                 }
1673         }
1674         /* Sessions make the DRC unnecessary: */
1675         if (argp->minorversion)
1676                 cachethis = false;
1677         svc_reserve(argp->rqstp, max_reply + readbytes);
1678         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1679
1680         if (readcount > 1 || max_reply > PAGE_SIZE - 2*RPC_MAX_AUTH_SIZE)
1681                 argp->rqstp->rq_splice_ok = false;
1682
1683         DECODE_TAIL;
1684 }
1685
1686 #define WRITE32(n)               *p++ = htonl(n)
1687 #define WRITE64(n)               do {                           \
1688         *p++ = htonl((u32)((n) >> 32));                         \
1689         *p++ = htonl((u32)(n));                                 \
1690 } while (0)
1691 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1692         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1693         memcpy(p, ptr, nbytes);                                 \
1694         p += XDR_QUADLEN(nbytes);                               \
1695 }} while (0)
1696
1697 static void write32(__be32 **p, u32 n)
1698 {
1699         *(*p)++ = htonl(n);
1700 }
1701
1702 static void write64(__be32 **p, u64 n)
1703 {
1704         write32(p, (n >> 32));
1705         write32(p, (u32)n);
1706 }
1707
1708 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1709 {
1710         if (IS_I_VERSION(inode)) {
1711                 write64(p, inode->i_version);
1712         } else {
1713                 write32(p, stat->ctime.tv_sec);
1714                 write32(p, stat->ctime.tv_nsec);
1715         }
1716 }
1717
1718 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1719 {
1720         write32(p, c->atomic);
1721         if (c->change_supported) {
1722                 write64(p, c->before_change);
1723                 write64(p, c->after_change);
1724         } else {
1725                 write32(p, c->before_ctime_sec);
1726                 write32(p, c->before_ctime_nsec);
1727                 write32(p, c->after_ctime_sec);
1728                 write32(p, c->after_ctime_nsec);
1729         }
1730 }
1731
1732 /* Encode as an array of strings the string given with components
1733  * separated @sep, escaped with esc_enter and esc_exit.
1734  */
1735 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1736                                           char *components, char esc_enter,
1737                                           char esc_exit)
1738 {
1739         __be32 *p;
1740         __be32 pathlen;
1741         int pathlen_offset;
1742         int strlen, count=0;
1743         char *str, *end, *next;
1744
1745         dprintk("nfsd4_encode_components(%s)\n", components);
1746
1747         pathlen_offset = xdr->buf->len;
1748         p = xdr_reserve_space(xdr, 4);
1749         if (!p)
1750                 return nfserr_resource;
1751         p++; /* We will fill this in with @count later */
1752
1753         end = str = components;
1754         while (*end) {
1755                 bool found_esc = false;
1756
1757                 /* try to parse as esc_start, ..., esc_end, sep */
1758                 if (*str == esc_enter) {
1759                         for (; *end && (*end != esc_exit); end++)
1760                                 /* find esc_exit or end of string */;
1761                         next = end + 1;
1762                         if (*end && (!*next || *next == sep)) {
1763                                 str++;
1764                                 found_esc = true;
1765                         }
1766                 }
1767
1768                 if (!found_esc)
1769                         for (; *end && (*end != sep); end++)
1770                                 /* find sep or end of string */;
1771
1772                 strlen = end - str;
1773                 if (strlen) {
1774                         p = xdr_reserve_space(xdr, strlen + 4);
1775                         if (!p)
1776                                 return nfserr_resource;
1777                         WRITE32(strlen);
1778                         WRITEMEM(str, strlen);
1779                         count++;
1780                 }
1781                 else
1782                         end++;
1783                 str = end;
1784         }
1785         pathlen = htonl(xdr->buf->len - pathlen_offset);
1786         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1787         return 0;
1788 }
1789
1790 /* Encode as an array of strings the string given with components
1791  * separated @sep.
1792  */
1793 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1794                                       char *components)
1795 {
1796         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1797 }
1798
1799 /*
1800  * encode a location element of a fs_locations structure
1801  */
1802 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1803                                         struct nfsd4_fs_location *location)
1804 {
1805         __be32 status;
1806
1807         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1808                                                 '[', ']');
1809         if (status)
1810                 return status;
1811         status = nfsd4_encode_components(xdr, '/', location->path);
1812         if (status)
1813                 return status;
1814         return 0;
1815 }
1816
1817 /*
1818  * Encode a path in RFC3530 'pathname4' format
1819  */
1820 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1821                                 const struct path *root,
1822                                 const struct path *path)
1823 {
1824         struct path cur = *path;
1825         __be32 *p;
1826         struct dentry **components = NULL;
1827         unsigned int ncomponents = 0;
1828         __be32 err = nfserr_jukebox;
1829
1830         dprintk("nfsd4_encode_components(");
1831
1832         path_get(&cur);
1833         /* First walk the path up to the nfsd root, and store the
1834          * dentries/path components in an array.
1835          */
1836         for (;;) {
1837                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1838                         break;
1839                 if (cur.dentry == cur.mnt->mnt_root) {
1840                         if (follow_up(&cur))
1841                                 continue;
1842                         goto out_free;
1843                 }
1844                 if ((ncomponents & 15) == 0) {
1845                         struct dentry **new;
1846                         new = krealloc(components,
1847                                         sizeof(*new) * (ncomponents + 16),
1848                                         GFP_KERNEL);
1849                         if (!new)
1850                                 goto out_free;
1851                         components = new;
1852                 }
1853                 components[ncomponents++] = cur.dentry;
1854                 cur.dentry = dget_parent(cur.dentry);
1855         }
1856         err = nfserr_resource;
1857         p = xdr_reserve_space(xdr, 4);
1858         if (!p)
1859                 goto out_free;
1860         WRITE32(ncomponents);
1861
1862         while (ncomponents) {
1863                 struct dentry *dentry = components[ncomponents - 1];
1864                 unsigned int len;
1865
1866                 spin_lock(&dentry->d_lock);
1867                 len = dentry->d_name.len;
1868                 p = xdr_reserve_space(xdr, len + 4);
1869                 if (!p) {
1870                         spin_unlock(&dentry->d_lock);
1871                         goto out_free;
1872                 }
1873                 WRITE32(len);
1874                 WRITEMEM(dentry->d_name.name, len);
1875                 dprintk("/%s", dentry->d_name.name);
1876                 spin_unlock(&dentry->d_lock);
1877                 dput(dentry);
1878                 ncomponents--;
1879         }
1880
1881         err = 0;
1882 out_free:
1883         dprintk(")\n");
1884         while (ncomponents)
1885                 dput(components[--ncomponents]);
1886         kfree(components);
1887         path_put(&cur);
1888         return err;
1889 }
1890
1891 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1892                         struct svc_rqst *rqstp, const struct path *path)
1893 {
1894         struct svc_export *exp_ps;
1895         __be32 res;
1896
1897         exp_ps = rqst_find_fsidzero_export(rqstp);
1898         if (IS_ERR(exp_ps))
1899                 return nfserrno(PTR_ERR(exp_ps));
1900         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1901         exp_put(exp_ps);
1902         return res;
1903 }
1904
1905 /*
1906  *  encode a fs_locations structure
1907  */
1908 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1909                         struct svc_rqst *rqstp, struct svc_export *exp)
1910 {
1911         __be32 status;
1912         int i;
1913         __be32 *p;
1914         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1915
1916         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1917         if (status)
1918                 return status;
1919         p = xdr_reserve_space(xdr, 4);
1920         if (!p)
1921                 return nfserr_resource;
1922         WRITE32(fslocs->locations_count);
1923         for (i=0; i<fslocs->locations_count; i++) {
1924                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1925                 if (status)
1926                         return status;
1927         }
1928         return 0;
1929 }
1930
1931 static u32 nfs4_file_type(umode_t mode)
1932 {
1933         switch (mode & S_IFMT) {
1934         case S_IFIFO:   return NF4FIFO;
1935         case S_IFCHR:   return NF4CHR;
1936         case S_IFDIR:   return NF4DIR;
1937         case S_IFBLK:   return NF4BLK;
1938         case S_IFLNK:   return NF4LNK;
1939         case S_IFREG:   return NF4REG;
1940         case S_IFSOCK:  return NF4SOCK;
1941         default:        return NF4BAD;
1942         };
1943 }
1944
1945 static inline __be32
1946 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1947                      struct nfs4_ace *ace)
1948 {
1949         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1950                 return nfs4_acl_write_who(xdr, ace->whotype);
1951         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1952                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1953         else
1954                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1955 }
1956
1957 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1958                               FATTR4_WORD0_RDATTR_ERROR)
1959 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1960
1961 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1962 static inline __be32
1963 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1964                             void *context, int len)
1965 {
1966         __be32 *p;
1967
1968         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1969         if (!p)
1970                 return nfserr_resource;
1971
1972         /*
1973          * For now we use a 0 here to indicate the null translation; in
1974          * the future we may place a call to translation code here.
1975          */
1976         WRITE32(0); /* lfs */
1977         WRITE32(0); /* pi */
1978         p = xdr_encode_opaque(p, context, len);
1979         return 0;
1980 }
1981 #else
1982 static inline __be32
1983 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1984                             void *context, int len)
1985 { return 0; }
1986 #endif
1987
1988 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1989 {
1990         /* As per referral draft:  */
1991         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1992             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1993                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1994                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1995                         *rdattr_err = NFSERR_MOVED;
1996                 else
1997                         return nfserr_moved;
1998         }
1999         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2000         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2001         return 0;
2002 }
2003
2004
2005 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2006 {
2007         struct path path = exp->ex_path;
2008         int err;
2009
2010         path_get(&path);
2011         while (follow_up(&path)) {
2012                 if (path.dentry != path.mnt->mnt_root)
2013                         break;
2014         }
2015         err = vfs_getattr(&path, stat);
2016         path_put(&path);
2017         return err;
2018 }
2019
2020 /*
2021  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2022  * ourselves.
2023  */
2024 __be32
2025 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2026                 struct svc_export *exp,
2027                 struct dentry *dentry, u32 *bmval,
2028                 struct svc_rqst *rqstp, int ignore_crossmnt)
2029 {
2030         u32 bmval0 = bmval[0];
2031         u32 bmval1 = bmval[1];
2032         u32 bmval2 = bmval[2];
2033         struct kstat stat;
2034         struct svc_fh *tempfh = NULL;
2035         struct kstatfs statfs;
2036         __be32 *p;
2037         int starting_len = xdr->buf->len;
2038         int attrlen_offset;
2039         __be32 attrlen;
2040         u32 dummy;
2041         u64 dummy64;
2042         u32 rdattr_err = 0;
2043         __be32 status;
2044         int err;
2045         int aclsupport = 0;
2046         struct nfs4_acl *acl = NULL;
2047         void *context = NULL;
2048         int contextlen;
2049         bool contextsupport = false;
2050         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2051         u32 minorversion = resp->cstate.minorversion;
2052         struct path path = {
2053                 .mnt    = exp->ex_path.mnt,
2054                 .dentry = dentry,
2055         };
2056         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2057
2058         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2059         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2060         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2061         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2062
2063         if (exp->ex_fslocs.migrated) {
2064                 BUG_ON(bmval[2]);
2065                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2066                 if (status)
2067                         goto out;
2068         }
2069
2070         err = vfs_getattr(&path, &stat);
2071         if (err)
2072                 goto out_nfserr;
2073         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2074                         FATTR4_WORD0_MAXNAME)) ||
2075             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2076                        FATTR4_WORD1_SPACE_TOTAL))) {
2077                 err = vfs_statfs(&path, &statfs);
2078                 if (err)
2079                         goto out_nfserr;
2080         }
2081         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2082                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2083                 status = nfserr_jukebox;
2084                 if (!tempfh)
2085                         goto out;
2086                 fh_init(tempfh, NFS4_FHSIZE);
2087                 status = fh_compose(tempfh, exp, dentry, NULL);
2088                 if (status)
2089                         goto out;
2090                 fhp = tempfh;
2091         }
2092         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2093                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2094                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2095                 aclsupport = (err == 0);
2096                 if (bmval0 & FATTR4_WORD0_ACL) {
2097                         if (err == -EOPNOTSUPP)
2098                                 bmval0 &= ~FATTR4_WORD0_ACL;
2099                         else if (err == -EINVAL) {
2100                                 status = nfserr_attrnotsupp;
2101                                 goto out;
2102                         } else if (err != 0)
2103                                 goto out_nfserr;
2104                 }
2105         }
2106
2107 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2108         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2109                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2110                 err = security_inode_getsecctx(dentry->d_inode,
2111                                                 &context, &contextlen);
2112                 contextsupport = (err == 0);
2113                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2114                         if (err == -EOPNOTSUPP)
2115                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2116                         else if (err)
2117                                 goto out_nfserr;
2118                 }
2119         }
2120 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2121
2122         if (bmval2) {
2123                 p = xdr_reserve_space(xdr, 16);
2124                 if (!p)
2125                         goto out_resource;
2126                 WRITE32(3);
2127                 WRITE32(bmval0);
2128                 WRITE32(bmval1);
2129                 WRITE32(bmval2);
2130         } else if (bmval1) {
2131                 p = xdr_reserve_space(xdr, 12);
2132                 if (!p)
2133                         goto out_resource;
2134                 WRITE32(2);
2135                 WRITE32(bmval0);
2136                 WRITE32(bmval1);
2137         } else {
2138                 p = xdr_reserve_space(xdr, 8);
2139                 if (!p)
2140                         goto out_resource;
2141                 WRITE32(1);
2142                 WRITE32(bmval0);
2143         }
2144
2145         attrlen_offset = xdr->buf->len;
2146         p = xdr_reserve_space(xdr, 4);
2147         if (!p)
2148                 goto out_resource;
2149         p++;                /* to be backfilled later */
2150
2151         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2152                 u32 word0 = nfsd_suppattrs0(minorversion);
2153                 u32 word1 = nfsd_suppattrs1(minorversion);
2154                 u32 word2 = nfsd_suppattrs2(minorversion);
2155
2156                 if (!aclsupport)
2157                         word0 &= ~FATTR4_WORD0_ACL;
2158                 if (!contextsupport)
2159                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2160                 if (!word2) {
2161                         p = xdr_reserve_space(xdr, 12);
2162                         if (!p)
2163                                 goto out_resource;
2164                         WRITE32(2);
2165                         WRITE32(word0);
2166                         WRITE32(word1);
2167                 } else {
2168                         p = xdr_reserve_space(xdr, 16);
2169                         if (!p)
2170                                 goto out_resource;
2171                         WRITE32(3);
2172                         WRITE32(word0);
2173                         WRITE32(word1);
2174                         WRITE32(word2);
2175                 }
2176         }
2177         if (bmval0 & FATTR4_WORD0_TYPE) {
2178                 p = xdr_reserve_space(xdr, 4);
2179                 if (!p)
2180                         goto out_resource;
2181                 dummy = nfs4_file_type(stat.mode);
2182                 if (dummy == NF4BAD) {
2183                         status = nfserr_serverfault;
2184                         goto out;
2185                 }
2186                 WRITE32(dummy);
2187         }
2188         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2189                 p = xdr_reserve_space(xdr, 4);
2190                 if (!p)
2191                         goto out_resource;
2192                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2193                         WRITE32(NFS4_FH_PERSISTENT);
2194                 else
2195                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2196         }
2197         if (bmval0 & FATTR4_WORD0_CHANGE) {
2198                 p = xdr_reserve_space(xdr, 8);
2199                 if (!p)
2200                         goto out_resource;
2201                 write_change(&p, &stat, dentry->d_inode);
2202         }
2203         if (bmval0 & FATTR4_WORD0_SIZE) {
2204                 p = xdr_reserve_space(xdr, 8);
2205                 if (!p)
2206                         goto out_resource;
2207                 WRITE64(stat.size);
2208         }
2209         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2210                 p = xdr_reserve_space(xdr, 4);
2211                 if (!p)
2212                         goto out_resource;
2213                 WRITE32(1);
2214         }
2215         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2216                 p = xdr_reserve_space(xdr, 4);
2217                 if (!p)
2218                         goto out_resource;
2219                 WRITE32(1);
2220         }
2221         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2222                 p = xdr_reserve_space(xdr, 4);
2223                 if (!p)
2224                         goto out_resource;
2225                 WRITE32(0);
2226         }
2227         if (bmval0 & FATTR4_WORD0_FSID) {
2228                 p = xdr_reserve_space(xdr, 16);
2229                 if (!p)
2230                         goto out_resource;
2231                 if (exp->ex_fslocs.migrated) {
2232                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2233                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2234                 } else switch(fsid_source(fhp)) {
2235                 case FSIDSOURCE_FSID:
2236                         WRITE64((u64)exp->ex_fsid);
2237                         WRITE64((u64)0);
2238                         break;
2239                 case FSIDSOURCE_DEV:
2240                         WRITE32(0);
2241                         WRITE32(MAJOR(stat.dev));
2242                         WRITE32(0);
2243                         WRITE32(MINOR(stat.dev));
2244                         break;
2245                 case FSIDSOURCE_UUID:
2246                         WRITEMEM(exp->ex_uuid, 16);
2247                         break;
2248                 }
2249         }
2250         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2251                 p = xdr_reserve_space(xdr, 4);
2252                 if (!p)
2253                         goto out_resource;
2254                 WRITE32(0);
2255         }
2256         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2257                 p = xdr_reserve_space(xdr, 4);
2258                 if (!p)
2259                         goto out_resource;
2260                 WRITE32(nn->nfsd4_lease);
2261         }
2262         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2263                 p = xdr_reserve_space(xdr, 4);
2264                 if (!p)
2265                         goto out_resource;
2266                 WRITE32(rdattr_err);
2267         }
2268         if (bmval0 & FATTR4_WORD0_ACL) {
2269                 struct nfs4_ace *ace;
2270
2271                 if (acl == NULL) {
2272                         p = xdr_reserve_space(xdr, 4);
2273                         if (!p)
2274                                 goto out_resource;
2275
2276                         WRITE32(0);
2277                         goto out_acl;
2278                 }
2279                 p = xdr_reserve_space(xdr, 4);
2280                 if (!p)
2281                         goto out_resource;
2282                 WRITE32(acl->naces);
2283
2284                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2285                         p = xdr_reserve_space(xdr, 4*3);
2286                         if (!p)
2287                                 goto out_resource;
2288                         WRITE32(ace->type);
2289                         WRITE32(ace->flag);
2290                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2291                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2292                         if (status)
2293                                 goto out;
2294                 }
2295         }
2296 out_acl:
2297         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2298                 p = xdr_reserve_space(xdr, 4);
2299                 if (!p)
2300                         goto out_resource;
2301                 WRITE32(aclsupport ?
2302                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2303         }
2304         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2305                 p = xdr_reserve_space(xdr, 4);
2306                 if (!p)
2307                         goto out_resource;
2308                 WRITE32(1);
2309         }
2310         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2311                 p = xdr_reserve_space(xdr, 4);
2312                 if (!p)
2313                         goto out_resource;
2314                 WRITE32(0);
2315         }
2316         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2317                 p = xdr_reserve_space(xdr, 4);
2318                 if (!p)
2319                         goto out_resource;
2320                 WRITE32(1);
2321         }
2322         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2323                 p = xdr_reserve_space(xdr, 4);
2324                 if (!p)
2325                         goto out_resource;
2326                 WRITE32(1);
2327         }
2328         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2329                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2330                 if (!p)
2331                         goto out_resource;
2332                 WRITE32(fhp->fh_handle.fh_size);
2333                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2334         }
2335         if (bmval0 & FATTR4_WORD0_FILEID) {
2336                 p = xdr_reserve_space(xdr, 8);
2337                 if (!p)
2338                         goto out_resource;
2339                 WRITE64(stat.ino);
2340         }
2341         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2342                 p = xdr_reserve_space(xdr, 8);
2343                 if (!p)
2344                         goto out_resource;
2345                 WRITE64((u64) statfs.f_ffree);
2346         }
2347         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2348                 p = xdr_reserve_space(xdr, 8);
2349                 if (!p)
2350                         goto out_resource;
2351                 WRITE64((u64) statfs.f_ffree);
2352         }
2353         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2354                 p = xdr_reserve_space(xdr, 8);
2355                 if (!p)
2356                         goto out_resource;
2357                 WRITE64((u64) statfs.f_files);
2358         }
2359         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2360                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2361                 if (status)
2362                         goto out;
2363         }
2364         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2365                 p = xdr_reserve_space(xdr, 4);
2366                 if (!p)
2367                         goto out_resource;
2368                 WRITE32(1);
2369         }
2370         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2371                 p = xdr_reserve_space(xdr, 8);
2372                 if (!p)
2373                         goto out_resource;
2374                 WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
2375         }
2376         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2377                 p = xdr_reserve_space(xdr, 4);
2378                 if (!p)
2379                         goto out_resource;
2380                 WRITE32(255);
2381         }
2382         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2383                 p = xdr_reserve_space(xdr, 4);
2384                 if (!p)
2385                         goto out_resource;
2386                 WRITE32(statfs.f_namelen);
2387         }
2388         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2389                 p = xdr_reserve_space(xdr, 8);
2390                 if (!p)
2391                         goto out_resource;
2392                 WRITE64((u64) svc_max_payload(rqstp));
2393         }
2394         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2395                 p = xdr_reserve_space(xdr, 8);
2396                 if (!p)
2397                         goto out_resource;
2398                 WRITE64((u64) svc_max_payload(rqstp));
2399         }
2400         if (bmval1 & FATTR4_WORD1_MODE) {
2401                 p = xdr_reserve_space(xdr, 4);
2402                 if (!p)
2403                         goto out_resource;
2404                 WRITE32(stat.mode & S_IALLUGO);
2405         }
2406         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2407                 p = xdr_reserve_space(xdr, 4);
2408                 if (!p)
2409                         goto out_resource;
2410                 WRITE32(1);
2411         }
2412         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2413                 p = xdr_reserve_space(xdr, 4);
2414                 if (!p)
2415                         goto out_resource;
2416                 WRITE32(stat.nlink);
2417         }
2418         if (bmval1 & FATTR4_WORD1_OWNER) {
2419                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2420                 if (status)
2421                         goto out;
2422         }
2423         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2424                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2425                 if (status)
2426                         goto out;
2427         }
2428         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2429                 p = xdr_reserve_space(xdr, 8);
2430                 if (!p)
2431                         goto out_resource;
2432                 WRITE32((u32) MAJOR(stat.rdev));
2433                 WRITE32((u32) MINOR(stat.rdev));
2434         }
2435         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2436                 p = xdr_reserve_space(xdr, 8);
2437                 if (!p)
2438                         goto out_resource;
2439                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2440                 WRITE64(dummy64);
2441         }
2442         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2443                 p = xdr_reserve_space(xdr, 8);
2444                 if (!p)
2445                         goto out_resource;
2446                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2447                 WRITE64(dummy64);
2448         }
2449         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2450                 p = xdr_reserve_space(xdr, 8);
2451                 if (!p)
2452                         goto out_resource;
2453                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2454                 WRITE64(dummy64);
2455         }
2456         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2457                 p = xdr_reserve_space(xdr, 8);
2458                 if (!p)
2459                         goto out_resource;
2460                 dummy64 = (u64)stat.blocks << 9;
2461                 WRITE64(dummy64);
2462         }
2463         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2464                 p = xdr_reserve_space(xdr, 12);
2465                 if (!p)
2466                         goto out_resource;
2467                 WRITE64((s64)stat.atime.tv_sec);
2468                 WRITE32(stat.atime.tv_nsec);
2469         }
2470         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2471                 p = xdr_reserve_space(xdr, 12);
2472                 if (!p)
2473                         goto out_resource;
2474                 WRITE32(0);
2475                 WRITE32(1);
2476                 WRITE32(0);
2477         }
2478         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2479                 p = xdr_reserve_space(xdr, 12);
2480                 if (!p)
2481                         goto out_resource;
2482                 WRITE64((s64)stat.ctime.tv_sec);
2483                 WRITE32(stat.ctime.tv_nsec);
2484         }
2485         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2486                 p = xdr_reserve_space(xdr, 12);
2487                 if (!p)
2488                         goto out_resource;
2489                 WRITE64((s64)stat.mtime.tv_sec);
2490                 WRITE32(stat.mtime.tv_nsec);
2491         }
2492         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2493                 p = xdr_reserve_space(xdr, 8);
2494                 if (!p)
2495                         goto out_resource;
2496                 /*
2497                  * Get parent's attributes if not ignoring crossmount
2498                  * and this is the root of a cross-mounted filesystem.
2499                  */
2500                 if (ignore_crossmnt == 0 &&
2501                     dentry == exp->ex_path.mnt->mnt_root)
2502                         get_parent_attributes(exp, &stat);
2503                 WRITE64(stat.ino);
2504         }
2505         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2506                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2507                                                                 contextlen);
2508                 if (status)
2509                         goto out;
2510         }
2511         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2512                 p = xdr_reserve_space(xdr, 16);
2513                 if (!p)
2514                         goto out_resource;
2515                 WRITE32(3);
2516                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2517                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2518                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2519         }
2520
2521         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2522         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2523         status = nfs_ok;
2524
2525 out:
2526 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2527         if (context)
2528                 security_release_secctx(context, contextlen);
2529 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2530         kfree(acl);
2531         if (tempfh) {
2532                 fh_put(tempfh);
2533                 kfree(tempfh);
2534         }
2535         if (status)
2536                 xdr_truncate_encode(xdr, starting_len);
2537         return status;
2538 out_nfserr:
2539         status = nfserrno(err);
2540         goto out;
2541 out_resource:
2542         status = nfserr_resource;
2543         goto out;
2544 }
2545
2546 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2547                                 struct xdr_buf *buf, __be32 *p, int bytes)
2548 {
2549         xdr->scratch.iov_len = 0;
2550         memset(buf, 0, sizeof(struct xdr_buf));
2551         buf->head[0].iov_base = p;
2552         buf->head[0].iov_len = 0;
2553         buf->len = 0;
2554         xdr->buf = buf;
2555         xdr->iov = buf->head;
2556         xdr->p = p;
2557         xdr->end = (void *)p + bytes;
2558         buf->buflen = bytes;
2559 }
2560
2561 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2562                         struct svc_fh *fhp, struct svc_export *exp,
2563                         struct dentry *dentry, u32 *bmval,
2564                         struct svc_rqst *rqstp, int ignore_crossmnt)
2565 {
2566         struct xdr_buf dummy;
2567         struct xdr_stream xdr;
2568         __be32 ret;
2569
2570         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2571         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2572                                                         ignore_crossmnt);
2573         *p = xdr.p;
2574         return ret;
2575 }
2576
2577 static inline int attributes_need_mount(u32 *bmval)
2578 {
2579         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2580                 return 1;
2581         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2582                 return 1;
2583         return 0;
2584 }
2585
2586 static __be32
2587 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2588                         const char *name, int namlen)
2589 {
2590         struct svc_export *exp = cd->rd_fhp->fh_export;
2591         struct dentry *dentry;
2592         __be32 nfserr;
2593         int ignore_crossmnt = 0;
2594
2595         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2596         if (IS_ERR(dentry))
2597                 return nfserrno(PTR_ERR(dentry));
2598         if (!dentry->d_inode) {
2599                 /*
2600                  * nfsd_buffered_readdir drops the i_mutex between
2601                  * readdir and calling this callback, leaving a window
2602                  * where this directory entry could have gone away.
2603                  */
2604                 dput(dentry);
2605                 return nfserr_noent;
2606         }
2607
2608         exp_get(exp);
2609         /*
2610          * In the case of a mountpoint, the client may be asking for
2611          * attributes that are only properties of the underlying filesystem
2612          * as opposed to the cross-mounted file system. In such a case,
2613          * we will not follow the cross mount and will fill the attribtutes
2614          * directly from the mountpoint dentry.
2615          */
2616         if (nfsd_mountpoint(dentry, exp)) {
2617                 int err;
2618
2619                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2620                                 && !attributes_need_mount(cd->rd_bmval)) {
2621                         ignore_crossmnt = 1;
2622                         goto out_encode;
2623                 }
2624                 /*
2625                  * Why the heck aren't we just using nfsd_lookup??
2626                  * Different "."/".." handling?  Something else?
2627                  * At least, add a comment here to explain....
2628                  */
2629                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2630                 if (err) {
2631                         nfserr = nfserrno(err);
2632                         goto out_put;
2633                 }
2634                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2635                 if (nfserr)
2636                         goto out_put;
2637
2638         }
2639 out_encode:
2640         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2641                                         cd->rd_rqstp, ignore_crossmnt);
2642 out_put:
2643         dput(dentry);
2644         exp_put(exp);
2645         return nfserr;
2646 }
2647
2648 static __be32 *
2649 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2650 {
2651         __be32 *p;
2652
2653         p = xdr_reserve_space(xdr, 6);
2654         if (!p)
2655                 return NULL;
2656         *p++ = htonl(2);
2657         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2658         *p++ = htonl(0);                         /* bmval1 */
2659
2660         *p++ = htonl(4);     /* attribute length */
2661         *p++ = nfserr;       /* no htonl */
2662         return p;
2663 }
2664
2665 static int
2666 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2667                     loff_t offset, u64 ino, unsigned int d_type)
2668 {
2669         struct readdir_cd *ccd = ccdv;
2670         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2671         struct xdr_stream *xdr = cd->xdr;
2672         int start_offset = xdr->buf->len;
2673         int cookie_offset;
2674         int entry_bytes;
2675         __be32 nfserr = nfserr_toosmall;
2676         __be64 wire_offset;
2677         __be32 *p;
2678
2679         /* In nfsv4, "." and ".." never make it onto the wire.. */
2680         if (name && isdotent(name, namlen)) {
2681                 cd->common.err = nfs_ok;
2682                 return 0;
2683         }
2684
2685         if (cd->cookie_offset) {
2686                 wire_offset = cpu_to_be64(offset);
2687                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2688                                                         &wire_offset, 8);
2689         }
2690
2691         p = xdr_reserve_space(xdr, 4);
2692         if (!p)
2693                 goto fail;
2694         *p++ = xdr_one;                             /* mark entry present */
2695         cookie_offset = xdr->buf->len;
2696         p = xdr_reserve_space(xdr, 3*4 + namlen);
2697         if (!p)
2698                 goto fail;
2699         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2700         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2701
2702         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2703         switch (nfserr) {
2704         case nfs_ok:
2705                 break;
2706         case nfserr_resource:
2707                 nfserr = nfserr_toosmall;
2708                 goto fail;
2709         case nfserr_noent:
2710                 goto skip_entry;
2711         default:
2712                 /*
2713                  * If the client requested the RDATTR_ERROR attribute,
2714                  * we stuff the error code into this attribute
2715                  * and continue.  If this attribute was not requested,
2716                  * then in accordance with the spec, we fail the
2717                  * entire READDIR operation(!)
2718                  */
2719                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2720                         goto fail;
2721                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2722                 if (p == NULL) {
2723                         nfserr = nfserr_toosmall;
2724                         goto fail;
2725                 }
2726         }
2727         nfserr = nfserr_toosmall;
2728         entry_bytes = xdr->buf->len - start_offset;
2729         if (entry_bytes > cd->rd_maxcount)
2730                 goto fail;
2731         cd->rd_maxcount -= entry_bytes;
2732         if (!cd->rd_dircount)
2733                 goto fail;
2734         cd->rd_dircount--;
2735         cd->cookie_offset = cookie_offset;
2736 skip_entry:
2737         cd->common.err = nfs_ok;
2738         return 0;
2739 fail:
2740         xdr_truncate_encode(xdr, start_offset);
2741         cd->common.err = nfserr;
2742         return -EINVAL;
2743 }
2744
2745 static __be32
2746 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2747 {
2748         __be32 *p;
2749
2750         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2751         if (!p)
2752                 return nfserr_resource;
2753         WRITE32(sid->si_generation);
2754         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2755         return 0;
2756 }
2757
2758 static __be32
2759 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2760 {
2761         struct xdr_stream *xdr = &resp->xdr;
2762         __be32 *p;
2763
2764         if (!nfserr) {
2765                 p = xdr_reserve_space(xdr, 8);
2766                 if (!p)
2767                         return nfserr_resource;
2768                 WRITE32(access->ac_supported);
2769                 WRITE32(access->ac_resp_access);
2770         }
2771         return nfserr;
2772 }
2773
2774 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2775 {
2776         struct xdr_stream *xdr = &resp->xdr;
2777         __be32 *p;
2778
2779         if (!nfserr) {
2780                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2781                 if (!p)
2782                         return nfserr_resource;
2783                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2784                 WRITE32(bcts->dir);
2785                 /* Sorry, we do not yet support RDMA over 4.1: */
2786                 WRITE32(0);
2787         }
2788         return nfserr;
2789 }
2790
2791 static __be32
2792 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2793 {
2794         struct xdr_stream *xdr = &resp->xdr;
2795
2796         if (!nfserr)
2797                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2798
2799         return nfserr;
2800 }
2801
2802
2803 static __be32
2804 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2805 {
2806         struct xdr_stream *xdr = &resp->xdr;
2807         __be32 *p;
2808
2809         if (!nfserr) {
2810                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2811                 if (!p)
2812                         return nfserr_resource;
2813                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2814         }
2815         return nfserr;
2816 }
2817
2818 static __be32
2819 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2820 {
2821         struct xdr_stream *xdr = &resp->xdr;
2822         __be32 *p;
2823
2824         if (!nfserr) {
2825                 p = xdr_reserve_space(xdr, 32);
2826                 if (!p)
2827                         return nfserr_resource;
2828                 write_cinfo(&p, &create->cr_cinfo);
2829                 WRITE32(2);
2830                 WRITE32(create->cr_bmval[0]);
2831                 WRITE32(create->cr_bmval[1]);
2832         }
2833         return nfserr;
2834 }
2835
2836 static __be32
2837 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2838 {
2839         struct svc_fh *fhp = getattr->ga_fhp;
2840         struct xdr_stream *xdr = &resp->xdr;
2841
2842         if (nfserr)
2843                 return nfserr;
2844
2845         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2846                                     getattr->ga_bmval,
2847                                     resp->rqstp, 0);
2848         return nfserr;
2849 }
2850
2851 static __be32
2852 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2853 {
2854         struct xdr_stream *xdr = &resp->xdr;
2855         struct svc_fh *fhp = *fhpp;
2856         unsigned int len;
2857         __be32 *p;
2858
2859         if (!nfserr) {
2860                 len = fhp->fh_handle.fh_size;
2861                 p = xdr_reserve_space(xdr, len + 4);
2862                 if (!p)
2863                         return nfserr_resource;
2864                 WRITE32(len);
2865                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2866         }
2867         return nfserr;
2868 }
2869
2870 /*
2871 * Including all fields other than the name, a LOCK4denied structure requires
2872 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2873 */
2874 static __be32
2875 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2876 {
2877         struct xdr_netobj *conf = &ld->ld_owner;
2878         __be32 *p;
2879
2880 again:
2881         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2882         if (!p) {
2883                 /*
2884                  * Don't fail to return the result just because we can't
2885                  * return the conflicting open:
2886                  */
2887                 if (conf->len) {
2888                         conf->len = 0;
2889                         conf->data = NULL;
2890                         goto again;
2891                 }
2892                 return nfserr_resource;
2893         }
2894         WRITE64(ld->ld_start);
2895         WRITE64(ld->ld_length);
2896         WRITE32(ld->ld_type);
2897         if (conf->len) {
2898                 WRITEMEM(&ld->ld_clientid, 8);
2899                 WRITE32(conf->len);
2900                 WRITEMEM(conf->data, conf->len);
2901         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2902                 WRITE64((u64)0); /* clientid */
2903                 WRITE32(0); /* length of owner name */
2904         }
2905         return nfserr_denied;
2906 }
2907
2908 static __be32
2909 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2910 {
2911         struct xdr_stream *xdr = &resp->xdr;
2912
2913         if (!nfserr)
2914                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2915         else if (nfserr == nfserr_denied)
2916                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2917         kfree(lock->lk_denied.ld_owner.data);
2918         return nfserr;
2919 }
2920
2921 static __be32
2922 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2923 {
2924         struct xdr_stream *xdr = &resp->xdr;
2925
2926         if (nfserr == nfserr_denied)
2927                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2928         return nfserr;
2929 }
2930
2931 static __be32
2932 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2933 {
2934         struct xdr_stream *xdr = &resp->xdr;
2935
2936         if (!nfserr)
2937                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2938
2939         return nfserr;
2940 }
2941
2942
2943 static __be32
2944 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2945 {
2946         struct xdr_stream *xdr = &resp->xdr;
2947         __be32 *p;
2948
2949         if (!nfserr) {
2950                 p = xdr_reserve_space(xdr, 20);
2951                 if (!p)
2952                         return nfserr_resource;
2953                 write_cinfo(&p, &link->li_cinfo);
2954         }
2955         return nfserr;
2956 }
2957
2958
2959 static __be32
2960 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2961 {
2962         struct xdr_stream *xdr = &resp->xdr;
2963         __be32 *p;
2964
2965         if (nfserr)
2966                 goto out;
2967
2968         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2969         if (nfserr)
2970                 goto out;
2971         p = xdr_reserve_space(xdr, 40);
2972         if (!p)
2973                 return nfserr_resource;
2974         write_cinfo(&p, &open->op_cinfo);
2975         WRITE32(open->op_rflags);
2976         WRITE32(2);
2977         WRITE32(open->op_bmval[0]);
2978         WRITE32(open->op_bmval[1]);
2979         WRITE32(open->op_delegate_type);
2980
2981         switch (open->op_delegate_type) {
2982         case NFS4_OPEN_DELEGATE_NONE:
2983                 break;
2984         case NFS4_OPEN_DELEGATE_READ:
2985                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2986                 if (nfserr)
2987                         return nfserr;
2988                 p = xdr_reserve_space(xdr, 20);
2989                 if (!p)
2990                         return nfserr_resource;
2991                 WRITE32(open->op_recall);
2992
2993                 /*
2994                  * TODO: ACE's in delegations
2995                  */
2996                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2997                 WRITE32(0);
2998                 WRITE32(0);
2999                 WRITE32(0);   /* XXX: is NULL principal ok? */
3000                 break;
3001         case NFS4_OPEN_DELEGATE_WRITE:
3002                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3003                 if (nfserr)
3004                         return nfserr;
3005                 p = xdr_reserve_space(xdr, 32);
3006                 if (!p)
3007                         return nfserr_resource;
3008                 WRITE32(0);
3009
3010                 /*
3011                  * TODO: space_limit's in delegations
3012                  */
3013                 WRITE32(NFS4_LIMIT_SIZE);
3014                 WRITE32(~(u32)0);
3015                 WRITE32(~(u32)0);
3016
3017                 /*
3018                  * TODO: ACE's in delegations
3019                  */
3020                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3021                 WRITE32(0);
3022                 WRITE32(0);
3023                 WRITE32(0);   /* XXX: is NULL principal ok? */
3024                 break;
3025         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3026                 switch (open->op_why_no_deleg) {
3027                 case WND4_CONTENTION:
3028                 case WND4_RESOURCE:
3029                         p = xdr_reserve_space(xdr, 8);
3030                         if (!p)
3031                                 return nfserr_resource;
3032                         WRITE32(open->op_why_no_deleg);
3033                         WRITE32(0);     /* deleg signaling not supported yet */
3034                         break;
3035                 default:
3036                         p = xdr_reserve_space(xdr, 4);
3037                         if (!p)
3038                                 return nfserr_resource;
3039                         WRITE32(open->op_why_no_deleg);
3040                 }
3041                 break;
3042         default:
3043                 BUG();
3044         }
3045         /* XXX save filehandle here */
3046 out:
3047         return nfserr;
3048 }
3049
3050 static __be32
3051 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3052 {
3053         struct xdr_stream *xdr = &resp->xdr;
3054
3055         if (!nfserr)
3056                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3057
3058         return nfserr;
3059 }
3060
3061 static __be32
3062 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3063 {
3064         struct xdr_stream *xdr = &resp->xdr;
3065
3066         if (!nfserr)
3067                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3068
3069         return nfserr;
3070 }
3071
3072 static __be32 nfsd4_encode_splice_read(
3073                                 struct nfsd4_compoundres *resp,
3074                                 struct nfsd4_read *read,
3075                                 struct file *file, unsigned long maxcount)
3076 {
3077         struct xdr_stream *xdr = &resp->xdr;
3078         struct xdr_buf *buf = xdr->buf;
3079         u32 eof;
3080         int space_left;
3081         __be32 nfserr;
3082         __be32 *p = xdr->p - 2;
3083
3084         /*
3085          * Don't inline pages unless we know there's room for eof,
3086          * count, and possible padding:
3087          */
3088         if (xdr->end - xdr->p < 3)
3089                 return nfserr_resource;
3090
3091         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3092                                   read->rd_offset, &maxcount);
3093         if (nfserr) {
3094                 /*
3095                  * nfsd_splice_actor may have already messed with the
3096                  * page length; reset it so as not to confuse
3097                  * xdr_truncate_encode:
3098                  */
3099                 buf->page_len = 0;
3100                 return nfserr;
3101         }
3102
3103         eof = (read->rd_offset + maxcount >=
3104                read->rd_fhp->fh_dentry->d_inode->i_size);
3105
3106         *(p++) = htonl(eof);
3107         *(p++) = htonl(maxcount);
3108
3109         buf->page_len = maxcount;
3110         buf->len += maxcount;
3111         xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE;
3112
3113         /* Use rest of head for padding and remaining ops: */
3114         buf->tail[0].iov_base = xdr->p;
3115         buf->tail[0].iov_len = 0;
3116         xdr->iov = buf->tail;
3117         if (maxcount&3) {
3118                 int pad = 4 - (maxcount&3);
3119
3120                 *(xdr->p++) = 0;
3121
3122                 buf->tail[0].iov_base += maxcount&3;
3123                 buf->tail[0].iov_len = pad;
3124                 buf->len += pad;
3125         }
3126
3127         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3128                                 buf->buflen - buf->len);
3129         buf->buflen = buf->len + space_left;
3130         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3131
3132         return 0;
3133 }
3134
3135 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3136                                  struct nfsd4_read *read,
3137                                  struct file *file, unsigned long maxcount)
3138 {
3139         struct xdr_stream *xdr = &resp->xdr;
3140         u32 eof;
3141         int v;
3142         int starting_len = xdr->buf->len - 8;
3143         long len;
3144         int thislen;
3145         __be32 nfserr;
3146         __be32 tmp;
3147         __be32 *p;
3148         u32 zzz = 0;
3149         int pad;
3150
3151         len = maxcount;
3152         v = 0;
3153
3154         thislen = (void *)xdr->end - (void *)xdr->p;
3155         if (len < thislen)
3156                 thislen = len;
3157         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3158         WARN_ON_ONCE(!p);
3159         resp->rqstp->rq_vec[v].iov_base = p;
3160         resp->rqstp->rq_vec[v].iov_len = thislen;
3161         v++;
3162         len -= thislen;
3163
3164         while (len) {
3165                 thislen = min_t(long, len, PAGE_SIZE);
3166                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3167                 WARN_ON_ONCE(!p);
3168                 resp->rqstp->rq_vec[v].iov_base = p;
3169                 resp->rqstp->rq_vec[v].iov_len = thislen;
3170                 v++;
3171                 len -= thislen;
3172         }
3173         read->rd_vlen = v;
3174
3175         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3176                         read->rd_vlen, &maxcount);
3177         if (nfserr)
3178                 return nfserr;
3179         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3180
3181         eof = (read->rd_offset + maxcount >=
3182                read->rd_fhp->fh_dentry->d_inode->i_size);
3183
3184         tmp = htonl(eof);
3185         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3186         tmp = htonl(maxcount);
3187         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3188
3189         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3190         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3191                                                                 &zzz, pad);
3192         return 0;
3193
3194 }
3195
3196 static __be32
3197 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3198                   struct nfsd4_read *read)
3199 {
3200         unsigned long maxcount;
3201         struct xdr_stream *xdr = &resp->xdr;
3202         struct file *file = read->rd_filp;
3203         int starting_len = xdr->buf->len;
3204         struct raparms *ra;
3205         __be32 *p;
3206         __be32 err;
3207
3208         if (nfserr)
3209                 return nfserr;
3210
3211         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3212         if (!p) {
3213                 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3214                 return nfserr_resource;
3215         }
3216         if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3217                 WARN_ON_ONCE(1);
3218                 return nfserr_resource;
3219         }
3220         xdr_commit_encode(xdr);
3221
3222         maxcount = svc_max_payload(resp->rqstp);
3223         if (maxcount > xdr->buf->buflen - xdr->buf->len)
3224                 maxcount = xdr->buf->buflen - xdr->buf->len;
3225         if (maxcount > read->rd_length)
3226                 maxcount = read->rd_length;
3227
3228         if (!read->rd_filp) {
3229                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3230                                                 &file, &ra);
3231                 if (err)
3232                         goto err_truncate;
3233         }
3234
3235         if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3236                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3237         else
3238                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3239
3240         if (!read->rd_filp)
3241                 nfsd_put_tmp_read_open(file, ra);
3242
3243 err_truncate:
3244         if (err)
3245                 xdr_truncate_encode(xdr, starting_len);
3246         return err;
3247 }
3248
3249 static __be32
3250 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3251 {
3252         int maxcount;
3253         __be32 wire_count;
3254         int zero = 0;
3255         struct xdr_stream *xdr = &resp->xdr;
3256         int length_offset = xdr->buf->len;
3257         __be32 *p;
3258
3259         if (nfserr)
3260                 return nfserr;
3261
3262         p = xdr_reserve_space(xdr, 4);
3263         if (!p)
3264                 return nfserr_resource;
3265         maxcount = PAGE_SIZE;
3266
3267         p = xdr_reserve_space(xdr, maxcount);
3268         if (!p)
3269                 return nfserr_resource;
3270         /*
3271          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3272          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3273          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3274          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3275          */
3276         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3277                                                 (char *)p, &maxcount);
3278         if (nfserr == nfserr_isdir)
3279                 nfserr = nfserr_inval;
3280         if (nfserr) {
3281                 xdr_truncate_encode(xdr, length_offset);
3282                 return nfserr;
3283         }
3284
3285         wire_count = htonl(maxcount);
3286         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3287         xdr_truncate_encode(xdr, length_offset + 4 + maxcount);
3288         if (maxcount & 3)
3289                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3290                                                 &zero, 4 - (maxcount&3));
3291         return 0;
3292 }
3293
3294 static __be32
3295 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3296 {
3297         int maxcount;
3298         int bytes_left;
3299         loff_t offset;
3300         __be64 wire_offset;
3301         struct xdr_stream *xdr = &resp->xdr;
3302         int starting_len = xdr->buf->len;
3303         __be32 *p;
3304
3305         if (nfserr)
3306                 return nfserr;
3307
3308         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3309         if (!p)
3310                 return nfserr_resource;
3311
3312         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3313         WRITE32(0);
3314         WRITE32(0);
3315         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3316                                 - (char *)resp->xdr.buf->head[0].iov_base;
3317
3318         /*
3319          * Number of bytes left for directory entries allowing for the
3320          * final 8 bytes of the readdir and a following failed op:
3321          */
3322         bytes_left = xdr->buf->buflen - xdr->buf->len
3323                         - COMPOUND_ERR_SLACK_SPACE - 8;
3324         if (bytes_left < 0) {
3325                 nfserr = nfserr_resource;
3326                 goto err_no_verf;
3327         }
3328         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3329         /*
3330          * Note the rfc defines rd_maxcount as the size of the
3331          * READDIR4resok structure, which includes the verifier above
3332          * and the 8 bytes encoded at the end of this function:
3333          */
3334         if (maxcount < 16) {
3335                 nfserr = nfserr_toosmall;
3336                 goto err_no_verf;
3337         }
3338         maxcount = min_t(int, maxcount-16, bytes_left);
3339
3340         readdir->xdr = xdr;
3341         readdir->rd_maxcount = maxcount;
3342         readdir->common.err = 0;
3343         readdir->cookie_offset = 0;
3344
3345         offset = readdir->rd_cookie;
3346         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3347                               &offset,
3348                               &readdir->common, nfsd4_encode_dirent);
3349         if (nfserr == nfs_ok &&
3350             readdir->common.err == nfserr_toosmall &&
3351             xdr->buf->len == starting_len + 8) {
3352                 /* nothing encoded; which limit did we hit?: */
3353                 if (maxcount - 16 < bytes_left)
3354                         /* It was the fault of rd_maxcount: */
3355                         nfserr = nfserr_toosmall;
3356                 else
3357                         /* We ran out of buffer space: */
3358                         nfserr = nfserr_resource;
3359         }
3360         if (nfserr)
3361                 goto err_no_verf;
3362
3363         if (readdir->cookie_offset) {
3364                 wire_offset = cpu_to_be64(offset);
3365                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3366                                                         &wire_offset, 8);
3367         }
3368
3369         p = xdr_reserve_space(xdr, 8);
3370         if (!p) {
3371                 WARN_ON_ONCE(1);
3372                 goto err_no_verf;
3373         }
3374         *p++ = 0;       /* no more entries */
3375         *p++ = htonl(readdir->common.err == nfserr_eof);
3376
3377         return 0;
3378 err_no_verf:
3379         xdr_truncate_encode(xdr, starting_len);
3380         return nfserr;
3381 }
3382
3383 static __be32
3384 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3385 {
3386         struct xdr_stream *xdr = &resp->xdr;
3387         __be32 *p;
3388
3389         if (!nfserr) {
3390                 p = xdr_reserve_space(xdr, 20);
3391                 if (!p)
3392                         return nfserr_resource;
3393                 write_cinfo(&p, &remove->rm_cinfo);
3394         }
3395         return nfserr;
3396 }
3397
3398 static __be32
3399 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3400 {
3401         struct xdr_stream *xdr = &resp->xdr;
3402         __be32 *p;
3403
3404         if (!nfserr) {
3405                 p = xdr_reserve_space(xdr, 40);
3406                 if (!p)
3407                         return nfserr_resource;
3408                 write_cinfo(&p, &rename->rn_sinfo);
3409                 write_cinfo(&p, &rename->rn_tinfo);
3410         }
3411         return nfserr;
3412 }
3413
3414 static __be32
3415 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3416                          __be32 nfserr, struct svc_export *exp)
3417 {
3418         u32 i, nflavs, supported;
3419         struct exp_flavor_info *flavs;
3420         struct exp_flavor_info def_flavs[2];
3421         __be32 *p, *flavorsp;
3422         static bool report = true;
3423
3424         if (nfserr)
3425                 goto out;
3426         nfserr = nfserr_resource;
3427         if (exp->ex_nflavors) {
3428                 flavs = exp->ex_flavors;
3429                 nflavs = exp->ex_nflavors;
3430         } else { /* Handling of some defaults in absence of real secinfo: */
3431                 flavs = def_flavs;
3432                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3433                         nflavs = 2;
3434                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3435                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3436                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3437                         nflavs = 1;
3438                         flavs[0].pseudoflavor
3439                                         = svcauth_gss_flavor(exp->ex_client);
3440                 } else {
3441                         nflavs = 1;
3442                         flavs[0].pseudoflavor
3443                                         = exp->ex_client->flavour->flavour;
3444                 }
3445         }
3446
3447         supported = 0;
3448         p = xdr_reserve_space(xdr, 4);
3449         if (!p)
3450                 goto out;
3451         flavorsp = p++;         /* to be backfilled later */
3452
3453         for (i = 0; i < nflavs; i++) {
3454                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3455                 struct rpcsec_gss_info info;
3456
3457                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3458                         supported++;
3459                         p = xdr_reserve_space(xdr, 4 + 4 +
3460                                               XDR_LEN(info.oid.len) + 4 + 4);
3461                         if (!p)
3462                                 goto out;
3463                         WRITE32(RPC_AUTH_GSS);
3464                         WRITE32(info.oid.len);
3465                         WRITEMEM(info.oid.data, info.oid.len);
3466                         WRITE32(info.qop);
3467                         WRITE32(info.service);
3468                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3469                         supported++;
3470                         p = xdr_reserve_space(xdr, 4);
3471                         if (!p)
3472                                 goto out;
3473                         WRITE32(pf);
3474                 } else {
3475                         if (report)
3476                                 pr_warn("NFS: SECINFO: security flavor %u "
3477                                         "is not supported\n", pf);
3478                 }
3479         }
3480
3481         if (nflavs != supported)
3482                 report = false;
3483         *flavorsp = htonl(supported);
3484         nfserr = 0;
3485 out:
3486         if (exp)
3487                 exp_put(exp);
3488         return nfserr;
3489 }
3490
3491 static __be32
3492 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3493                      struct nfsd4_secinfo *secinfo)
3494 {
3495         struct xdr_stream *xdr = &resp->xdr;
3496
3497         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3498 }
3499
3500 static __be32
3501 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3502                      struct nfsd4_secinfo_no_name *secinfo)
3503 {
3504         struct xdr_stream *xdr = &resp->xdr;
3505
3506         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3507 }
3508
3509 /*
3510  * The SETATTR encode routine is special -- it always encodes a bitmap,
3511  * regardless of the error status.
3512  */
3513 static __be32
3514 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3515 {
3516         struct xdr_stream *xdr = &resp->xdr;
3517         __be32 *p;
3518
3519         p = xdr_reserve_space(xdr, 16);
3520         if (!p)
3521                 return nfserr_resource;
3522         if (nfserr) {
3523                 WRITE32(3);
3524                 WRITE32(0);
3525                 WRITE32(0);
3526                 WRITE32(0);
3527         }
3528         else {
3529                 WRITE32(3);
3530                 WRITE32(setattr->sa_bmval[0]);
3531                 WRITE32(setattr->sa_bmval[1]);
3532                 WRITE32(setattr->sa_bmval[2]);
3533         }
3534         return nfserr;
3535 }
3536
3537 static __be32
3538 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3539 {
3540         struct xdr_stream *xdr = &resp->xdr;
3541         __be32 *p;
3542
3543         if (!nfserr) {
3544                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3545                 if (!p)
3546                         return nfserr_resource;
3547                 WRITEMEM(&scd->se_clientid, 8);
3548                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3549         }
3550         else if (nfserr == nfserr_clid_inuse) {
3551                 p = xdr_reserve_space(xdr, 8);
3552                 if (!p)
3553                         return nfserr_resource;
3554                 WRITE32(0);
3555                 WRITE32(0);
3556         }
3557         return nfserr;
3558 }
3559
3560 static __be32
3561 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3562 {
3563         struct xdr_stream *xdr = &resp->xdr;
3564         __be32 *p;
3565
3566         if (!nfserr) {
3567                 p = xdr_reserve_space(xdr, 16);
3568                 if (!p)
3569                         return nfserr_resource;
3570                 WRITE32(write->wr_bytes_written);
3571                 WRITE32(write->wr_how_written);
3572                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3573         }
3574         return nfserr;
3575 }
3576
3577 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3578         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3579               1 << (OP_EXCHANGE_ID - 32) |
3580               1 << (OP_CREATE_SESSION - 32) |
3581               1 << (OP_DESTROY_SESSION - 32) |
3582               1 << (OP_DESTROY_CLIENTID - 32)
3583 };
3584
3585 static __be32
3586 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3587                          struct nfsd4_exchange_id *exid)
3588 {
3589         struct xdr_stream *xdr = &resp->xdr;
3590         __be32 *p;
3591         char *major_id;
3592         char *server_scope;
3593         int major_id_sz;
3594         int server_scope_sz;
3595         uint64_t minor_id = 0;
3596
3597         if (nfserr)
3598                 return nfserr;
3599
3600         major_id = utsname()->nodename;
3601         major_id_sz = strlen(major_id);
3602         server_scope = utsname()->nodename;
3603         server_scope_sz = strlen(server_scope);
3604
3605         p = xdr_reserve_space(xdr,
3606                 8 /* eir_clientid */ +
3607                 4 /* eir_sequenceid */ +
3608                 4 /* eir_flags */ +
3609                 4 /* spr_how */);
3610         if (!p)
3611                 return nfserr_resource;
3612
3613         WRITEMEM(&exid->clientid, 8);
3614         WRITE32(exid->seqid);
3615         WRITE32(exid->flags);
3616
3617         WRITE32(exid->spa_how);
3618
3619         switch (exid->spa_how) {
3620         case SP4_NONE:
3621                 break;
3622         case SP4_MACH_CRED:
3623                 /* spo_must_enforce, spo_must_allow */
3624                 p = xdr_reserve_space(xdr, 16);
3625                 if (!p)
3626                         return nfserr_resource;
3627
3628                 /* spo_must_enforce bitmap: */
3629                 WRITE32(2);
3630                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3631                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3632                 /* empty spo_must_allow bitmap: */
3633                 WRITE32(0);
3634
3635                 break;
3636         default:
3637                 WARN_ON_ONCE(1);
3638         }
3639
3640         p = xdr_reserve_space(xdr,
3641                 8 /* so_minor_id */ +
3642                 4 /* so_major_id.len */ +
3643                 (XDR_QUADLEN(major_id_sz) * 4) +
3644                 4 /* eir_server_scope.len */ +
3645                 (XDR_QUADLEN(server_scope_sz) * 4) +
3646                 4 /* eir_server_impl_id.count (0) */);
3647         if (!p)
3648                 return nfserr_resource;
3649
3650         /* The server_owner struct */
3651         WRITE64(minor_id);      /* Minor id */
3652         /* major id */
3653         WRITE32(major_id_sz);
3654         WRITEMEM(major_id, major_id_sz);
3655
3656         /* Server scope */
3657         WRITE32(server_scope_sz);
3658         WRITEMEM(server_scope, server_scope_sz);
3659
3660         /* Implementation id */
3661         WRITE32(0);     /* zero length nfs_impl_id4 array */
3662         return 0;
3663 }
3664
3665 static __be32
3666 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3667                             struct nfsd4_create_session *sess)
3668 {
3669         struct xdr_stream *xdr = &resp->xdr;
3670         __be32 *p;
3671
3672         if (nfserr)
3673                 return nfserr;
3674
3675         p = xdr_reserve_space(xdr, 24);
3676         if (!p)
3677                 return nfserr_resource;
3678         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3679         WRITE32(sess->seqid);
3680         WRITE32(sess->flags);
3681
3682         p = xdr_reserve_space(xdr, 28);
3683         if (!p)
3684                 return nfserr_resource;
3685         WRITE32(0); /* headerpadsz */
3686         WRITE32(sess->fore_channel.maxreq_sz);
3687         WRITE32(sess->fore_channel.maxresp_sz);
3688         WRITE32(sess->fore_channel.maxresp_cached);
3689         WRITE32(sess->fore_channel.maxops);
3690         WRITE32(sess->fore_channel.maxreqs);
3691         WRITE32(sess->fore_channel.nr_rdma_attrs);
3692
3693         if (sess->fore_channel.nr_rdma_attrs) {
3694                 p = xdr_reserve_space(xdr, 4);
3695                 if (!p)
3696                         return nfserr_resource;
3697                 WRITE32(sess->fore_channel.rdma_attrs);
3698         }
3699
3700         p = xdr_reserve_space(xdr, 28);
3701         if (!p)
3702                 return nfserr_resource;
3703         WRITE32(0); /* headerpadsz */
3704         WRITE32(sess->back_channel.maxreq_sz);
3705         WRITE32(sess->back_channel.maxresp_sz);
3706         WRITE32(sess->back_channel.maxresp_cached);
3707         WRITE32(sess->back_channel.maxops);
3708         WRITE32(sess->back_channel.maxreqs);
3709         WRITE32(sess->back_channel.nr_rdma_attrs);
3710
3711         if (sess->back_channel.nr_rdma_attrs) {
3712                 p = xdr_reserve_space(xdr, 4);
3713                 if (!p)
3714                         return nfserr_resource;
3715                 WRITE32(sess->back_channel.rdma_attrs);
3716         }
3717         return 0;
3718 }
3719
3720 static __be32
3721 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3722                       struct nfsd4_sequence *seq)
3723 {
3724         struct xdr_stream *xdr = &resp->xdr;
3725         __be32 *p;
3726
3727         if (nfserr)
3728                 return nfserr;
3729
3730         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3731         if (!p)
3732                 return nfserr_resource;
3733         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3734         WRITE32(seq->seqid);
3735         WRITE32(seq->slotid);
3736         /* Note slotid's are numbered from zero: */
3737         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3738         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3739         WRITE32(seq->status_flags);
3740
3741         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3742         return 0;
3743 }
3744
3745 static __be32
3746 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3747                           struct nfsd4_test_stateid *test_stateid)
3748 {
3749         struct xdr_stream *xdr = &resp->xdr;
3750         struct nfsd4_test_stateid_id *stateid, *next;
3751         __be32 *p;
3752
3753         if (nfserr)
3754                 return nfserr;
3755
3756         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3757         if (!p)
3758                 return nfserr_resource;
3759         *p++ = htonl(test_stateid->ts_num_ids);
3760
3761         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3762                 *p++ = stateid->ts_id_status;
3763         }
3764
3765         return nfserr;
3766 }
3767
3768 static __be32
3769 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3770 {
3771         return nfserr;
3772 }
3773
3774 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3775
3776 /*
3777  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3778  * since we don't need to filter out obsolete ops as this is
3779  * done in the decoding phase.
3780  */
3781 static nfsd4_enc nfsd4_enc_ops[] = {
3782         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3783         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3784         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3785         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3786         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3787         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3788         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3789         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3790         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3791         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3792         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3793         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3794         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3795         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3796         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3797         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3798         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3799         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3800         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3801         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3802         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3803         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3804         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3805         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3806         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3807         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3808         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3809         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3810         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3811         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3812         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3813         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3814         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3815         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3816         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3817         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3818         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3819
3820         /* NFSv4.1 operations */
3821         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3822         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3823         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3824         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3825         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3826         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3827         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3828         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3829         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3830         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3831         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3832         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3833         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3834         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3835         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3836         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3837         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3838         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3839         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3840 };
3841
3842 /*
3843  * Calculate whether we still have space to encode repsize bytes.
3844  * There are two considerations:
3845  *     - For NFS versions >=4.1, the size of the reply must stay within
3846  *       session limits
3847  *     - For all NFS versions, we must stay within limited preallocated
3848  *       buffer space.
3849  *
3850  * This is called before the operation is processed, so can only provide
3851  * an upper estimate.  For some nonidempotent operations (such as
3852  * getattr), it's not necessarily a problem if that estimate is wrong,
3853  * as we can fail it after processing without significant side effects.
3854  */
3855 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3856 {
3857         struct xdr_buf *buf = &resp->rqstp->rq_res;
3858         struct nfsd4_slot *slot = resp->cstate.slot;
3859
3860         if (buf->len + respsize <= buf->buflen)
3861                 return nfs_ok;
3862         if (!nfsd4_has_session(&resp->cstate))
3863                 return nfserr_resource;
3864         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3865                 WARN_ON_ONCE(1);
3866                 return nfserr_rep_too_big_to_cache;
3867         }
3868         return nfserr_rep_too_big;
3869 }
3870
3871 void
3872 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3873 {
3874         struct xdr_stream *xdr = &resp->xdr;
3875         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3876         struct svc_rqst *rqstp = resp->rqstp;
3877         int post_err_offset;
3878         nfsd4_enc encoder;
3879         __be32 *p;
3880
3881         p = xdr_reserve_space(xdr, 8);
3882         if (!p) {
3883                 WARN_ON_ONCE(1);
3884                 return;
3885         }
3886         WRITE32(op->opnum);
3887         post_err_offset = xdr->buf->len;
3888
3889         if (op->opnum == OP_ILLEGAL)
3890                 goto status;
3891         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3892                !nfsd4_enc_ops[op->opnum]);
3893         encoder = nfsd4_enc_ops[op->opnum];
3894         op->status = encoder(resp, op->status, &op->u);
3895         xdr_commit_encode(xdr);
3896
3897         /* nfsd4_check_resp_size guarantees enough room for error status */
3898         if (!op->status) {
3899                 int space_needed = 0;
3900                 if (!nfsd4_last_compound_op(rqstp))
3901                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3902                 op->status = nfsd4_check_resp_size(resp, space_needed);
3903         }
3904         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3905                 struct nfsd4_slot *slot = resp->cstate.slot;
3906
3907                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3908                         op->status = nfserr_rep_too_big_to_cache;
3909                 else
3910                         op->status = nfserr_rep_too_big;
3911         }
3912         if (op->status == nfserr_resource ||
3913             op->status == nfserr_rep_too_big ||
3914             op->status == nfserr_rep_too_big_to_cache) {
3915                 /*
3916                  * The operation may have already been encoded or
3917                  * partially encoded.  No op returns anything additional
3918                  * in the case of one of these three errors, so we can
3919                  * just truncate back to after the status.  But it's a
3920                  * bug if we had to do this on a non-idempotent op:
3921                  */
3922                 warn_on_nonidempotent_op(op);
3923                 xdr_truncate_encode(xdr, post_err_offset);
3924         }
3925         if (so) {
3926                 int len = xdr->buf->len - post_err_offset;
3927
3928                 so->so_replay.rp_status = op->status;
3929                 so->so_replay.rp_buflen = len;
3930                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3931                                                 so->so_replay.rp_buf, len);
3932         }
3933 status:
3934         /* Note that op->status is already in network byte order: */
3935         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3936 }
3937
3938 /*
3939  * Encode the reply stored in the stateowner reply cache
3940  *
3941  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3942  * previously sent already encoded operation.
3943  *
3944  * called with nfs4_lock_state() held
3945  */
3946 void
3947 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
3948 {
3949         __be32 *p;
3950         struct nfs4_replay *rp = op->replay;
3951
3952         BUG_ON(!rp);
3953
3954         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
3955         if (!p) {
3956                 WARN_ON_ONCE(1);
3957                 return;
3958         }
3959         WRITE32(op->opnum);
3960         *p++ = rp->rp_status;  /* already xdr'ed */
3961
3962         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3963 }
3964
3965 int
3966 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3967 {
3968         return xdr_ressize_check(rqstp, p);
3969 }
3970
3971 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3972 {
3973         struct svc_rqst *rqstp = rq;
3974         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3975
3976         if (args->ops != args->iops) {
3977                 kfree(args->ops);
3978                 args->ops = args->iops;
3979         }
3980         kfree(args->tmpp);
3981         args->tmpp = NULL;
3982         while (args->to_free) {
3983                 struct tmpbuf *tb = args->to_free;
3984                 args->to_free = tb->next;
3985                 tb->release(tb->buf);
3986                 kfree(tb);
3987         }
3988         return 1;
3989 }
3990
3991 int
3992 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3993 {
3994         if (rqstp->rq_arg.head[0].iov_len % 4) {
3995                 /* client is nuts */
3996                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3997                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3998                 return 0;
3999         }
4000         args->p = p;
4001         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4002         args->pagelist = rqstp->rq_arg.pages;
4003         args->pagelen = rqstp->rq_arg.page_len;
4004         args->tmpp = NULL;
4005         args->to_free = NULL;
4006         args->ops = args->iops;
4007         args->rqstp = rqstp;
4008
4009         return !nfsd4_decode_compound(args);
4010 }
4011
4012 int
4013 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4014 {
4015         /*
4016          * All that remains is to write the tag and operation count...
4017          */
4018         struct nfsd4_compound_state *cs = &resp->cstate;
4019         struct xdr_buf *buf = resp->xdr.buf;
4020
4021         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4022                                  buf->tail[0].iov_len);
4023
4024         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4025
4026         p = resp->tagp;
4027         *p++ = htonl(resp->taglen);
4028         memcpy(p, resp->tag, resp->taglen);
4029         p += XDR_QUADLEN(resp->taglen);
4030         *p++ = htonl(resp->opcnt);
4031
4032         if (nfsd4_has_session(cs)) {
4033                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4034                 struct nfs4_client *clp = cs->session->se_client;
4035                 if (cs->status != nfserr_replay_cache) {
4036                         nfsd4_store_cache_entry(resp);
4037                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4038                 }
4039                 /* Renew the clientid on success and on replay */
4040                 spin_lock(&nn->client_lock);
4041                 nfsd4_put_session(cs->session);
4042                 spin_unlock(&nn->client_lock);
4043                 put_client_renew(clp);
4044         }
4045         return 1;
4046 }
4047
4048 /*
4049  * Local variables:
4050  *  c-basic-offset: 8
4051  * End:
4052  */