fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/sunrpc/svcauth_gss.h>
  49
  50 #include "idmap.h"
  51 #include "acl.h"
  52 #include "xdr4.h"
  53 #include "vfs.h"
  54 #include "state.h"
  55 #include "cache.h"
  56 #include "netns.h"
  57
  58 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  59 #include <linux/security.h>
  60 #endif
  61
  62
  63 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  64
  65 /*
  66  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  67  * directory in order to indicate to the client that a filesystem boundary is present
  68  * We use a fixed fsid for a referral
  69  */
  70 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  71 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  72
  73 static __be32
  74 check_filename(char *str, int len)
  75 {
  76         int i;
  77
  78         if (len == 0)
  79                 return nfserr_inval;
  80         if (isdotent(str, len))
  81                 return nfserr_badname;
  82         for (i = 0; i < len; i++)
  83                 if (str[i] == '/')
  84                         return nfserr_badname;
  85         return 0;
  86 }
  87
  88 #define DECODE_HEAD                             \
  89         __be32 *p;                              \
  90         __be32 status
  91 #define DECODE_TAIL                             \
  92         status = 0;                             \
  93 out:                                            \
  94         return status;                          \
  95 xdr_error:                                      \
  96         dprintk("NFSD: xdr error (%s:%d)\n",    \
  97                         __FILE__, __LINE__);    \
  98         status = nfserr_bad_xdr;                \
  99         goto out
 100
 101 #define READ32(x)         (x) = ntohl(*p++)
 102 #define READ64(x)         do {                  \
 103         (x) = (u64)ntohl(*p++) << 32;           \
 104         (x) |= ntohl(*p++);                     \
 105 } while (0)
 106 #define READMEM(x,nbytes) do {                  \
 107         x = (char *)p;                          \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define SAVEMEM(x,nbytes) do {                  \
 111         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 112                 savemem(argp, p, nbytes) :      \
 113                 (char *)p)) {                   \
 114                 dprintk("NFSD: xdr error (%s:%d)\n", \
 115                                 __FILE__, __LINE__); \
 116                 goto xdr_error;                 \
 117                 }                               \
 118         p += XDR_QUADLEN(nbytes);               \
 119 } while (0)
 120 #define COPYMEM(x,nbytes) do {                  \
 121         memcpy((x), p, nbytes);                 \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124
 125 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 126 #define READ_BUF(nbytes)  do {                  \
 127         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 128                 p = argp->p;                    \
 129                 argp->p += XDR_QUADLEN(nbytes); \
 130         } else if (!(p = read_buf(argp, nbytes))) { \
 131                 dprintk("NFSD: xdr error (%s:%d)\n", \
 132                                 __FILE__, __LINE__); \
 133                 goto xdr_error;                 \
 134         }                                       \
 135 } while (0)
 136
 137 static void next_decode_page(struct nfsd4_compoundargs *argp)
 138 {
 139         argp->p = page_address(argp->pagelist[0]);
 140         argp->pagelist++;
 141         if (argp->pagelen < PAGE_SIZE) {
 142                 argp->end = argp->p + (argp->pagelen>>2);
 143                 argp->pagelen = 0;
 144         } else {
 145                 argp->end = argp->p + (PAGE_SIZE>>2);
 146                 argp->pagelen -= PAGE_SIZE;
 147         }
 148 }
 149
 150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 151 {
 152         /* We want more bytes than seem to be available.
 153          * Maybe we need a new page, maybe we have just run out
 154          */
 155         unsigned int avail = (char *)argp->end - (char *)argp->p;
 156         __be32 *p;
 157         if (avail + argp->pagelen < nbytes)
 158                 return NULL;
 159         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 160                 return NULL;
 161         /* ok, we can do it with the current plus the next page */
 162         if (nbytes <= sizeof(argp->tmp))
 163                 p = argp->tmp;
 164         else {
 165                 kfree(argp->tmpp);
 166                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 167                 if (!p)
 168                         return NULL;
 169
 170         }
 171         /*
 172          * The following memcpy is safe because read_buf is always
 173          * called with nbytes > avail, and the two cases above both
 174          * guarantee p points to at least nbytes bytes.
 175          */
 176         memcpy(p, argp->p, avail);
 177         next_decode_page(argp);
 178         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 179         argp->p += XDR_QUADLEN(nbytes - avail);
 180         return p;
 181 }
 182
 183 static int zero_clientid(clientid_t *clid)
 184 {
 185         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 186 }
 187
 188 /**
 189  * defer_free - mark an allocation as deferred freed
 190  * @argp: NFSv4 compound argument structure to be freed with
 191  * @release: release callback to free @p, typically kfree()
 192  * @p: pointer to be freed
 193  *
 194  * Marks @p to be freed when processing the compound operation
 195  * described in @argp finishes.
 196  */
 197 static int
 198 defer_free(struct nfsd4_compoundargs *argp,
 199                 void (*release)(const void *), void *p)
 200 {
 201         struct tmpbuf *tb;
 202
 203         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 204         if (!tb)
 205                 return -ENOMEM;
 206         tb->buf = p;
 207         tb->release = release;
 208         tb->next = argp->to_free;
 209         argp->to_free = tb;
 210         return 0;
 211 }
 212
 213 /**
 214  * savemem - duplicate a chunk of memory for later processing
 215  * @argp: NFSv4 compound argument structure to be freed with
 216  * @p: pointer to be duplicated
 217  * @nbytes: length to be duplicated
 218  *
 219  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 220  * that are preserved until processing of the NFSv4 compound
 221  * operation described by @argp finishes.
 222  */
 223 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 224 {
 225         if (p == argp->tmp) {
 226                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 227                 if (!p)
 228                         return NULL;
 229         } else {
 230                 BUG_ON(p != argp->tmpp);
 231                 argp->tmpp = NULL;
 232         }
 233         if (defer_free(argp, kfree, p)) {
 234                 kfree(p);
 235                 return NULL;
 236         } else
 237                 return (char *)p;
 238 }
 239
 240 static __be32
 241 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 242 {
 243         u32 bmlen;
 244         DECODE_HEAD;
 245
 246         bmval[0] = 0;
 247         bmval[1] = 0;
 248         bmval[2] = 0;
 249
 250         READ_BUF(4);
 251         READ32(bmlen);
 252         if (bmlen > 1000)
 253                 goto xdr_error;
 254
 255         READ_BUF(bmlen << 2);
 256         if (bmlen > 0)
 257                 READ32(bmval[0]);
 258         if (bmlen > 1)
 259                 READ32(bmval[1]);
 260         if (bmlen > 2)
 261                 READ32(bmval[2]);
 262
 263         DECODE_TAIL;
 264 }
 265
 266 static __be32
 267 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 268                    struct iattr *iattr, struct nfs4_acl **acl,
 269                    struct xdr_netobj *label)
 270 {
 271         int expected_len, len = 0;
 272         u32 dummy32;
 273         char *buf;
 274
 275         DECODE_HEAD;
 276         iattr->ia_valid = 0;
 277         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 278                 return status;
 279
 280         READ_BUF(4);
 281         READ32(expected_len);
 282
 283         if (bmval[0] & FATTR4_WORD0_SIZE) {
 284                 READ_BUF(8);
 285                 len += 8;
 286                 READ64(iattr->ia_size);
 287                 iattr->ia_valid |= ATTR_SIZE;
 288         }
 289         if (bmval[0] & FATTR4_WORD0_ACL) {
 290                 u32 nace;
 291                 struct nfs4_ace *ace;
 292
 293                 READ_BUF(4); len += 4;
 294                 READ32(nace);
 295
 296                 if (nace > NFS4_ACL_MAX)
 297                         return nfserr_fbig;
 298
 299                 *acl = nfs4_acl_new(nace);
 300                 if (*acl == NULL)
 301                         return nfserr_jukebox;
 302
 303                 defer_free(argp, kfree, *acl);
 304
 305                 (*acl)->naces = nace;
 306                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 307                         READ_BUF(16); len += 16;
 308                         READ32(ace->type);
 309                         READ32(ace->flag);
 310                         READ32(ace->access_mask);
 311                         READ32(dummy32);
 312                         READ_BUF(dummy32);
 313                         len += XDR_QUADLEN(dummy32) << 2;
 314                         READMEM(buf, dummy32);
 315                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 316                         status = nfs_ok;
 317                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 318                                 ;
 319                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 320                                 status = nfsd_map_name_to_gid(argp->rqstp,
 321                                                 buf, dummy32, &ace->who_gid);
 322                         else
 323                                 status = nfsd_map_name_to_uid(argp->rqstp,
 324                                                 buf, dummy32, &ace->who_uid);
 325                         if (status)
 326                                 return status;
 327                 }
 328         } else
 329                 *acl = NULL;
 330         if (bmval[1] & FATTR4_WORD1_MODE) {
 331                 READ_BUF(4);
 332                 len += 4;
 333                 READ32(iattr->ia_mode);
 334                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 335                 iattr->ia_valid |= ATTR_MODE;
 336         }
 337         if (bmval[1] & FATTR4_WORD1_OWNER) {
 338                 READ_BUF(4);
 339                 len += 4;
 340                 READ32(dummy32);
 341                 READ_BUF(dummy32);
 342                 len += (XDR_QUADLEN(dummy32) << 2);
 343                 READMEM(buf, dummy32);
 344                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 345                         return status;
 346                 iattr->ia_valid |= ATTR_UID;
 347         }
 348         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 349                 READ_BUF(4);
 350                 len += 4;
 351                 READ32(dummy32);
 352                 READ_BUF(dummy32);
 353                 len += (XDR_QUADLEN(dummy32) << 2);
 354                 READMEM(buf, dummy32);
 355                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 356                         return status;
 357                 iattr->ia_valid |= ATTR_GID;
 358         }
 359         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 360                 READ_BUF(4);
 361                 len += 4;
 362                 READ32(dummy32);
 363                 switch (dummy32) {
 364                 case NFS4_SET_TO_CLIENT_TIME:
 365                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 366                            all 32 bits of 'nseconds'. */
 367                         READ_BUF(12);
 368                         len += 12;
 369                         READ64(iattr->ia_atime.tv_sec);
 370                         READ32(iattr->ia_atime.tv_nsec);
 371                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 372                                 return nfserr_inval;
 373                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 374                         break;
 375                 case NFS4_SET_TO_SERVER_TIME:
 376                         iattr->ia_valid |= ATTR_ATIME;
 377                         break;
 378                 default:
 379                         goto xdr_error;
 380                 }
 381         }
 382         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 383                 READ_BUF(4);
 384                 len += 4;
 385                 READ32(dummy32);
 386                 switch (dummy32) {
 387                 case NFS4_SET_TO_CLIENT_TIME:
 388                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 389                            all 32 bits of 'nseconds'. */
 390                         READ_BUF(12);
 391                         len += 12;
 392                         READ64(iattr->ia_mtime.tv_sec);
 393                         READ32(iattr->ia_mtime.tv_nsec);
 394                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 395                                 return nfserr_inval;
 396                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 397                         break;
 398                 case NFS4_SET_TO_SERVER_TIME:
 399                         iattr->ia_valid |= ATTR_MTIME;
 400                         break;
 401                 default:
 402                         goto xdr_error;
 403                 }
 404         }
 405
 406         label->len = 0;
 407 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 408         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 409                 READ_BUF(4);
 410                 len += 4;
 411                 READ32(dummy32); /* lfs: we don't use it */
 412                 READ_BUF(4);
 413                 len += 4;
 414                 READ32(dummy32); /* pi: we don't use it either */
 415                 READ_BUF(4);
 416                 len += 4;
 417                 READ32(dummy32);
 418                 READ_BUF(dummy32);
 419                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 420                         return nfserr_badlabel;
 421                 len += (XDR_QUADLEN(dummy32) << 2);
 422                 READMEM(buf, dummy32);
 423                 label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
 424                 if (!label->data)
 425                         return nfserr_jukebox;
 426                 label->len = dummy32;
 427                 defer_free(argp, kfree, label->data);
 428                 memcpy(label->data, buf, dummy32);
 429         }
 430 #endif
 431
 432         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 433             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 434             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 435                 READ_BUF(expected_len - len);
 436         else if (len != expected_len)
 437                 goto xdr_error;
 438
 439         DECODE_TAIL;
 440 }
 441
 442 static __be32
 443 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 444 {
 445         DECODE_HEAD;
 446
 447         READ_BUF(sizeof(stateid_t));
 448         READ32(sid->si_generation);
 449         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 450
 451         DECODE_TAIL;
 452 }
 453
 454 static __be32
 455 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 456 {
 457         DECODE_HEAD;
 458
 459         READ_BUF(4);
 460         READ32(access->ac_req_access);
 461
 462         DECODE_TAIL;
 463 }
 464
 465 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 466 {
 467         DECODE_HEAD;
 468         u32 dummy, uid, gid;
 469         char *machine_name;
 470         int i;
 471         int nr_secflavs;
 472
 473         /* callback_sec_params4 */
 474         READ_BUF(4);
 475         READ32(nr_secflavs);
 476         if (nr_secflavs)
 477                 cbs->flavor = (u32)(-1);
 478         else
 479                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 480                 cbs->flavor = 0;
 481         for (i = 0; i < nr_secflavs; ++i) {
 482                 READ_BUF(4);
 483                 READ32(dummy);
 484                 switch (dummy) {
 485                 case RPC_AUTH_NULL:
 486                         /* Nothing to read */
 487                         if (cbs->flavor == (u32)(-1))
 488                                 cbs->flavor = RPC_AUTH_NULL;
 489                         break;
 490                 case RPC_AUTH_UNIX:
 491                         READ_BUF(8);
 492                         /* stamp */
 493                         READ32(dummy);
 494
 495                         /* machine name */
 496                         READ32(dummy);
 497                         READ_BUF(dummy);
 498                         SAVEMEM(machine_name, dummy);
 499
 500                         /* uid, gid */
 501                         READ_BUF(8);
 502                         READ32(uid);
 503                         READ32(gid);
 504
 505                         /* more gids */
 506                         READ_BUF(4);
 507                         READ32(dummy);
 508                         READ_BUF(dummy * 4);
 509                         if (cbs->flavor == (u32)(-1)) {
 510                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 511                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 512                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 513                                         cbs->uid = kuid;
 514                                         cbs->gid = kgid;
 515                                         cbs->flavor = RPC_AUTH_UNIX;
 516                                 } else {
 517                                         dprintk("RPC_AUTH_UNIX with invalid"
 518                                                 "uid or gid ignoring!\n");
 519                                 }
 520                         }
 521                         break;
 522                 case RPC_AUTH_GSS:
 523                         dprintk("RPC_AUTH_GSS callback secflavor "
 524                                 "not supported!\n");
 525                         READ_BUF(8);
 526                         /* gcbp_service */
 527                         READ32(dummy);
 528                         /* gcbp_handle_from_server */
 529                         READ32(dummy);
 530                         READ_BUF(dummy);
 531                         p += XDR_QUADLEN(dummy);
 532                         /* gcbp_handle_from_client */
 533                         READ_BUF(4);
 534                         READ32(dummy);
 535                         READ_BUF(dummy);
 536                         break;
 537                 default:
 538                         dprintk("Illegal callback secflavor\n");
 539                         return nfserr_inval;
 540                 }
 541         }
 542         DECODE_TAIL;
 543 }
 544
 545 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 546 {
 547         DECODE_HEAD;
 548
 549         READ_BUF(4);
 550         READ32(bc->bc_cb_program);
 551         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 552
 553         DECODE_TAIL;
 554 }
 555
 556 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 557 {
 558         DECODE_HEAD;
 559
 560         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 561         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 562         READ32(bcts->dir);
 563         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 564          * could help us figure out we should be using it. */
 565         DECODE_TAIL;
 566 }
 567
 568 static __be32
 569 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 570 {
 571         DECODE_HEAD;
 572
 573         READ_BUF(4);
 574         READ32(close->cl_seqid);
 575         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 576
 577         DECODE_TAIL;
 578 }
 579
 580
 581 static __be32
 582 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 583 {
 584         DECODE_HEAD;
 585
 586         READ_BUF(12);
 587         READ64(commit->co_offset);
 588         READ32(commit->co_count);
 589
 590         DECODE_TAIL;
 591 }
 592
 593 static __be32
 594 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 595 {
 596         DECODE_HEAD;
 597
 598         READ_BUF(4);
 599         READ32(create->cr_type);
 600         switch (create->cr_type) {
 601         case NF4LNK:
 602                 READ_BUF(4);
 603                 READ32(create->cr_linklen);
 604                 READ_BUF(create->cr_linklen);
 605                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 606                 break;
 607         case NF4BLK:
 608         case NF4CHR:
 609                 READ_BUF(8);
 610                 READ32(create->cr_specdata1);
 611                 READ32(create->cr_specdata2);
 612                 break;
 613         case NF4SOCK:
 614         case NF4FIFO:
 615         case NF4DIR:
 616         default:
 617                 break;
 618         }
 619
 620         READ_BUF(4);
 621         READ32(create->cr_namelen);
 622         READ_BUF(create->cr_namelen);
 623         SAVEMEM(create->cr_name, create->cr_namelen);
 624         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 625                 return status;
 626
 627         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 628                                     &create->cr_acl, &create->cr_label);
 629         if (status)
 630                 goto out;
 631
 632         DECODE_TAIL;
 633 }
 634
 635 static inline __be32
 636 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 637 {
 638         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 639 }
 640
 641 static inline __be32
 642 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 643 {
 644         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 645 }
 646
 647 static __be32
 648 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 649 {
 650         DECODE_HEAD;
 651
 652         READ_BUF(4);
 653         READ32(link->li_namelen);
 654         READ_BUF(link->li_namelen);
 655         SAVEMEM(link->li_name, link->li_namelen);
 656         if ((status = check_filename(link->li_name, link->li_namelen)))
 657                 return status;
 658
 659         DECODE_TAIL;
 660 }
 661
 662 static __be32
 663 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 664 {
 665         DECODE_HEAD;
 666
 667         /*
 668         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 669         */
 670         READ_BUF(28);
 671         READ32(lock->lk_type);
 672         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 673                 goto xdr_error;
 674         READ32(lock->lk_reclaim);
 675         READ64(lock->lk_offset);
 676         READ64(lock->lk_length);
 677         READ32(lock->lk_is_new);
 678
 679         if (lock->lk_is_new) {
 680                 READ_BUF(4);
 681                 READ32(lock->lk_new_open_seqid);
 682                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 683                 if (status)
 684                         return status;
 685                 READ_BUF(8 + sizeof(clientid_t));
 686                 READ32(lock->lk_new_lock_seqid);
 687                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 688                 READ32(lock->lk_new_owner.len);
 689                 READ_BUF(lock->lk_new_owner.len);
 690                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 691         } else {
 692                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 693                 if (status)
 694                         return status;
 695                 READ_BUF(4);
 696                 READ32(lock->lk_old_lock_seqid);
 697         }
 698
 699         DECODE_TAIL;
 700 }
 701
 702 static __be32
 703 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 704 {
 705         DECODE_HEAD;
 706
 707         READ_BUF(32);
 708         READ32(lockt->lt_type);
 709         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 710                 goto xdr_error;
 711         READ64(lockt->lt_offset);
 712         READ64(lockt->lt_length);
 713         COPYMEM(&lockt->lt_clientid, 8);
 714         READ32(lockt->lt_owner.len);
 715         READ_BUF(lockt->lt_owner.len);
 716         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 717
 718         DECODE_TAIL;
 719 }
 720
 721 static __be32
 722 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 723 {
 724         DECODE_HEAD;
 725
 726         READ_BUF(8);
 727         READ32(locku->lu_type);
 728         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 729                 goto xdr_error;
 730         READ32(locku->lu_seqid);
 731         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 732         if (status)
 733                 return status;
 734         READ_BUF(16);
 735         READ64(locku->lu_offset);
 736         READ64(locku->lu_length);
 737
 738         DECODE_TAIL;
 739 }
 740
 741 static __be32
 742 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 743 {
 744         DECODE_HEAD;
 745
 746         READ_BUF(4);
 747         READ32(lookup->lo_len);
 748         READ_BUF(lookup->lo_len);
 749         SAVEMEM(lookup->lo_name, lookup->lo_len);
 750         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 751                 return status;
 752
 753         DECODE_TAIL;
 754 }
 755
 756 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 757 {
 758         __be32 *p;
 759         u32 w;
 760
 761         READ_BUF(4);
 762         READ32(w);
 763         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 764         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 765         if (deleg_when)
 766                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 767
 768         switch (w & NFS4_SHARE_ACCESS_MASK) {
 769         case NFS4_SHARE_ACCESS_READ:
 770         case NFS4_SHARE_ACCESS_WRITE:
 771         case NFS4_SHARE_ACCESS_BOTH:
 772                 break;
 773         default:
 774                 return nfserr_bad_xdr;
 775         }
 776         w &= ~NFS4_SHARE_ACCESS_MASK;
 777         if (!w)
 778                 return nfs_ok;
 779         if (!argp->minorversion)
 780                 return nfserr_bad_xdr;
 781         switch (w & NFS4_SHARE_WANT_MASK) {
 782         case NFS4_SHARE_WANT_NO_PREFERENCE:
 783         case NFS4_SHARE_WANT_READ_DELEG:
 784         case NFS4_SHARE_WANT_WRITE_DELEG:
 785         case NFS4_SHARE_WANT_ANY_DELEG:
 786         case NFS4_SHARE_WANT_NO_DELEG:
 787         case NFS4_SHARE_WANT_CANCEL:
 788                 break;
 789         default:
 790                 return nfserr_bad_xdr;
 791         }
 792         w &= ~NFS4_SHARE_WANT_MASK;
 793         if (!w)
 794                 return nfs_ok;
 795
 796         if (!deleg_when)        /* open_downgrade */
 797                 return nfserr_inval;
 798         switch (w) {
 799         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 800         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 801         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 802               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 803                 return nfs_ok;
 804         }
 805 xdr_error:
 806         return nfserr_bad_xdr;
 807 }
 808
 809 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 810 {
 811         __be32 *p;
 812
 813         READ_BUF(4);
 814         READ32(*x);
 815         /* Note: unlinke access bits, deny bits may be zero. */
 816         if (*x & ~NFS4_SHARE_DENY_BOTH)
 817                 return nfserr_bad_xdr;
 818         return nfs_ok;
 819 xdr_error:
 820         return nfserr_bad_xdr;
 821 }
 822
 823 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 824 {
 825         __be32 *p;
 826
 827         READ_BUF(4);
 828         READ32(o->len);
 829
 830         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 831                 return nfserr_bad_xdr;
 832
 833         READ_BUF(o->len);
 834         SAVEMEM(o->data, o->len);
 835         return nfs_ok;
 836 xdr_error:
 837         return nfserr_bad_xdr;
 838 }
 839
 840 static __be32
 841 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 842 {
 843         DECODE_HEAD;
 844         u32 dummy;
 845
 846         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 847         open->op_iattr.ia_valid = 0;
 848         open->op_openowner = NULL;
 849
 850         open->op_xdr_error = 0;
 851         /* seqid, share_access, share_deny, clientid, ownerlen */
 852         READ_BUF(4);
 853         READ32(open->op_seqid);
 854         /* decode, yet ignore deleg_when until supported */
 855         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 856                                            &open->op_deleg_want, &dummy);
 857         if (status)
 858                 goto xdr_error;
 859         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 860         if (status)
 861                 goto xdr_error;
 862         READ_BUF(sizeof(clientid_t));
 863         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 864         status = nfsd4_decode_opaque(argp, &open->op_owner);
 865         if (status)
 866                 goto xdr_error;
 867         READ_BUF(4);
 868         READ32(open->op_create);
 869         switch (open->op_create) {
 870         case NFS4_OPEN_NOCREATE:
 871                 break;
 872         case NFS4_OPEN_CREATE:
 873                 READ_BUF(4);
 874                 READ32(open->op_createmode);
 875                 switch (open->op_createmode) {
 876                 case NFS4_CREATE_UNCHECKED:
 877                 case NFS4_CREATE_GUARDED:
 878                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 879                                 &open->op_iattr, &open->op_acl, &open->op_label);
 880                         if (status)
 881                                 goto out;
 882                         break;
 883                 case NFS4_CREATE_EXCLUSIVE:
 884                         READ_BUF(NFS4_VERIFIER_SIZE);
 885                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 886                         break;
 887                 case NFS4_CREATE_EXCLUSIVE4_1:
 888                         if (argp->minorversion < 1)
 889                                 goto xdr_error;
 890                         READ_BUF(NFS4_VERIFIER_SIZE);
 891                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 892                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 893                                 &open->op_iattr, &open->op_acl, &open->op_label);
 894                         if (status)
 895                                 goto out;
 896                         break;
 897                 default:
 898                         goto xdr_error;
 899                 }
 900                 break;
 901         default:
 902                 goto xdr_error;
 903         }
 904
 905         /* open_claim */
 906         READ_BUF(4);
 907         READ32(open->op_claim_type);
 908         switch (open->op_claim_type) {
 909         case NFS4_OPEN_CLAIM_NULL:
 910         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 911                 READ_BUF(4);
 912                 READ32(open->op_fname.len);
 913                 READ_BUF(open->op_fname.len);
 914                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 915                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 916                         return status;
 917                 break;
 918         case NFS4_OPEN_CLAIM_PREVIOUS:
 919                 READ_BUF(4);
 920                 READ32(open->op_delegate_type);
 921                 break;
 922         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 923                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 924                 if (status)
 925                         return status;
 926                 READ_BUF(4);
 927                 READ32(open->op_fname.len);
 928                 READ_BUF(open->op_fname.len);
 929                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 930                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 931                         return status;
 932                 break;
 933         case NFS4_OPEN_CLAIM_FH:
 934         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 935                 if (argp->minorversion < 1)
 936                         goto xdr_error;
 937                 /* void */
 938                 break;
 939         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 940                 if (argp->minorversion < 1)
 941                         goto xdr_error;
 942                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 943                 if (status)
 944                         return status;
 945                 break;
 946         default:
 947                 goto xdr_error;
 948         }
 949
 950         DECODE_TAIL;
 951 }
 952
 953 static __be32
 954 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 955 {
 956         DECODE_HEAD;
 957
 958         if (argp->minorversion >= 1)
 959                 return nfserr_notsupp;
 960
 961         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 962         if (status)
 963                 return status;
 964         READ_BUF(4);
 965         READ32(open_conf->oc_seqid);
 966
 967         DECODE_TAIL;
 968 }
 969
 970 static __be32
 971 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 972 {
 973         DECODE_HEAD;
 974
 975         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 976         if (status)
 977                 return status;
 978         READ_BUF(4);
 979         READ32(open_down->od_seqid);
 980         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 981                                            &open_down->od_deleg_want, NULL);
 982         if (status)
 983                 return status;
 984         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 985         if (status)
 986                 return status;
 987         DECODE_TAIL;
 988 }
 989
 990 static __be32
 991 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 992 {
 993         DECODE_HEAD;
 994
 995         READ_BUF(4);
 996         READ32(putfh->pf_fhlen);
 997         if (putfh->pf_fhlen > NFS4_FHSIZE)
 998                 goto xdr_error;
 999         READ_BUF(putfh->pf_fhlen);
1000         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1001
1002         DECODE_TAIL;
1003 }
1004
1005 static __be32
1006 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1007 {
1008         if (argp->minorversion == 0)
1009                 return nfs_ok;
1010         return nfserr_notsupp;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1015 {
1016         DECODE_HEAD;
1017
1018         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1019         if (status)
1020                 return status;
1021         READ_BUF(12);
1022         READ64(read->rd_offset);
1023         READ32(read->rd_length);
1024
1025         DECODE_TAIL;
1026 }
1027
1028 static __be32
1029 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1030 {
1031         DECODE_HEAD;
1032
1033         READ_BUF(24);
1034         READ64(readdir->rd_cookie);
1035         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1036         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
1037         READ32(readdir->rd_maxcount);
1038         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1039                 goto out;
1040
1041         DECODE_TAIL;
1042 }
1043
1044 static __be32
1045 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1046 {
1047         DECODE_HEAD;
1048
1049         READ_BUF(4);
1050         READ32(remove->rm_namelen);
1051         READ_BUF(remove->rm_namelen);
1052         SAVEMEM(remove->rm_name, remove->rm_namelen);
1053         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1054                 return status;
1055
1056         DECODE_TAIL;
1057 }
1058
1059 static __be32
1060 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1061 {
1062         DECODE_HEAD;
1063
1064         READ_BUF(4);
1065         READ32(rename->rn_snamelen);
1066         READ_BUF(rename->rn_snamelen + 4);
1067         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1068         READ32(rename->rn_tnamelen);
1069         READ_BUF(rename->rn_tnamelen);
1070         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1071         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1072                 return status;
1073         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1074                 return status;
1075
1076         DECODE_TAIL;
1077 }
1078
1079 static __be32
1080 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1081 {
1082         DECODE_HEAD;
1083
1084         if (argp->minorversion >= 1)
1085                 return nfserr_notsupp;
1086
1087         READ_BUF(sizeof(clientid_t));
1088         COPYMEM(clientid, sizeof(clientid_t));
1089
1090         DECODE_TAIL;
1091 }
1092
1093 static __be32
1094 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1095                      struct nfsd4_secinfo *secinfo)
1096 {
1097         DECODE_HEAD;
1098
1099         READ_BUF(4);
1100         READ32(secinfo->si_namelen);
1101         READ_BUF(secinfo->si_namelen);
1102         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1103         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1104         if (status)
1105                 return status;
1106         DECODE_TAIL;
1107 }
1108
1109 static __be32
1110 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1111                      struct nfsd4_secinfo_no_name *sin)
1112 {
1113         DECODE_HEAD;
1114
1115         READ_BUF(4);
1116         READ32(sin->sin_style);
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1122 {
1123         __be32 status;
1124
1125         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1126         if (status)
1127                 return status;
1128         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1129                                   &setattr->sa_acl, &setattr->sa_label);
1130 }
1131
1132 static __be32
1133 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1134 {
1135         DECODE_HEAD;
1136
1137         if (argp->minorversion >= 1)
1138                 return nfserr_notsupp;
1139
1140         READ_BUF(NFS4_VERIFIER_SIZE);
1141         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1142
1143         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1144         if (status)
1145                 return nfserr_bad_xdr;
1146         READ_BUF(8);
1147         READ32(setclientid->se_callback_prog);
1148         READ32(setclientid->se_callback_netid_len);
1149
1150         READ_BUF(setclientid->se_callback_netid_len + 4);
1151         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1152         READ32(setclientid->se_callback_addr_len);
1153
1154         READ_BUF(setclientid->se_callback_addr_len + 4);
1155         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1156         READ32(setclientid->se_callback_ident);
1157
1158         DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1163 {
1164         DECODE_HEAD;
1165
1166         if (argp->minorversion >= 1)
1167                 return nfserr_notsupp;
1168
1169         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1170         COPYMEM(&scd_c->sc_clientid, 8);
1171         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1172
1173         DECODE_TAIL;
1174 }
1175
1176 /* Also used for NVERIFY */
1177 static __be32
1178 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1179 {
1180         DECODE_HEAD;
1181
1182         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1183                 goto out;
1184
1185         /* For convenience's sake, we compare raw xdr'd attributes in
1186          * nfsd4_proc_verify */
1187
1188         READ_BUF(4);
1189         READ32(verify->ve_attrlen);
1190         READ_BUF(verify->ve_attrlen);
1191         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1192
1193         DECODE_TAIL;
1194 }
1195
1196 static __be32
1197 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1198 {
1199         int avail;
1200         int len;
1201         DECODE_HEAD;
1202
1203         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1204         if (status)
1205                 return status;
1206         READ_BUF(16);
1207         READ64(write->wr_offset);
1208         READ32(write->wr_stable_how);
1209         if (write->wr_stable_how > 2)
1210                 goto xdr_error;
1211         READ32(write->wr_buflen);
1212
1213         /* Sorry .. no magic macros for this.. *
1214          * READ_BUF(write->wr_buflen);
1215          * SAVEMEM(write->wr_buf, write->wr_buflen);
1216          */
1217         avail = (char*)argp->end - (char*)argp->p;
1218         if (avail + argp->pagelen < write->wr_buflen) {
1219                 dprintk("NFSD: xdr error (%s:%d)\n",
1220                                 __FILE__, __LINE__);
1221                 goto xdr_error;
1222         }
1223         write->wr_head.iov_base = p;
1224         write->wr_head.iov_len = avail;
1225         write->wr_pagelist = argp->pagelist;
1226
1227         len = XDR_QUADLEN(write->wr_buflen) << 2;
1228         if (len >= avail) {
1229                 int pages;
1230
1231                 len -= avail;
1232
1233                 pages = len >> PAGE_SHIFT;
1234                 argp->pagelist += pages;
1235                 argp->pagelen -= pages * PAGE_SIZE;
1236                 len -= pages * PAGE_SIZE;
1237
1238                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1239                 argp->pagelist++;
1240                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1241         }
1242         argp->p += XDR_QUADLEN(len);
1243
1244         DECODE_TAIL;
1245 }
1246
1247 static __be32
1248 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1249 {
1250         DECODE_HEAD;
1251
1252         if (argp->minorversion >= 1)
1253                 return nfserr_notsupp;
1254
1255         READ_BUF(12);
1256         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1257         READ32(rlockowner->rl_owner.len);
1258         READ_BUF(rlockowner->rl_owner.len);
1259         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1260
1261         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1262                 return nfserr_inval;
1263         DECODE_TAIL;
1264 }
1265
1266 static __be32
1267 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1268                          struct nfsd4_exchange_id *exid)
1269 {
1270         int dummy, tmp;
1271         DECODE_HEAD;
1272
1273         READ_BUF(NFS4_VERIFIER_SIZE);
1274         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1275
1276         status = nfsd4_decode_opaque(argp, &exid->clname);
1277         if (status)
1278                 return nfserr_bad_xdr;
1279
1280         READ_BUF(4);
1281         READ32(exid->flags);
1282
1283         /* Ignore state_protect4_a */
1284         READ_BUF(4);
1285         READ32(exid->spa_how);
1286         switch (exid->spa_how) {
1287         case SP4_NONE:
1288                 break;
1289         case SP4_MACH_CRED:
1290                 /* spo_must_enforce */
1291                 READ_BUF(4);
1292                 READ32(dummy);
1293                 READ_BUF(dummy * 4);
1294                 p += dummy;
1295
1296                 /* spo_must_allow */
1297                 READ_BUF(4);
1298                 READ32(dummy);
1299                 READ_BUF(dummy * 4);
1300                 p += dummy;
1301                 break;
1302         case SP4_SSV:
1303                 /* ssp_ops */
1304                 READ_BUF(4);
1305                 READ32(dummy);
1306                 READ_BUF(dummy * 4);
1307                 p += dummy;
1308
1309                 READ_BUF(4);
1310                 READ32(dummy);
1311                 READ_BUF(dummy * 4);
1312                 p += dummy;
1313
1314                 /* ssp_hash_algs<> */
1315                 READ_BUF(4);
1316                 READ32(tmp);
1317                 while (tmp--) {
1318                         READ_BUF(4);
1319                         READ32(dummy);
1320                         READ_BUF(dummy);
1321                         p += XDR_QUADLEN(dummy);
1322                 }
1323
1324                 /* ssp_encr_algs<> */
1325                 READ_BUF(4);
1326                 READ32(tmp);
1327                 while (tmp--) {
1328                         READ_BUF(4);
1329                         READ32(dummy);
1330                         READ_BUF(dummy);
1331                         p += XDR_QUADLEN(dummy);
1332                 }
1333
1334                 /* ssp_window and ssp_num_gss_handles */
1335                 READ_BUF(8);
1336                 READ32(dummy);
1337                 READ32(dummy);
1338                 break;
1339         default:
1340                 goto xdr_error;
1341         }
1342
1343         /* Ignore Implementation ID */
1344         READ_BUF(4);    /* nfs_impl_id4 array length */
1345         READ32(dummy);
1346
1347         if (dummy > 1)
1348                 goto xdr_error;
1349
1350         if (dummy == 1) {
1351                 /* nii_domain */
1352                 READ_BUF(4);
1353                 READ32(dummy);
1354                 READ_BUF(dummy);
1355                 p += XDR_QUADLEN(dummy);
1356
1357                 /* nii_name */
1358                 READ_BUF(4);
1359                 READ32(dummy);
1360                 READ_BUF(dummy);
1361                 p += XDR_QUADLEN(dummy);
1362
1363                 /* nii_date */
1364                 READ_BUF(12);
1365                 p += 3;
1366         }
1367         DECODE_TAIL;
1368 }
1369
1370 static __be32
1371 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1372                             struct nfsd4_create_session *sess)
1373 {
1374         DECODE_HEAD;
1375         u32 dummy;
1376
1377         READ_BUF(16);
1378         COPYMEM(&sess->clientid, 8);
1379         READ32(sess->seqid);
1380         READ32(sess->flags);
1381
1382         /* Fore channel attrs */
1383         READ_BUF(28);
1384         READ32(dummy); /* headerpadsz is always 0 */
1385         READ32(sess->fore_channel.maxreq_sz);
1386         READ32(sess->fore_channel.maxresp_sz);
1387         READ32(sess->fore_channel.maxresp_cached);
1388         READ32(sess->fore_channel.maxops);
1389         READ32(sess->fore_channel.maxreqs);
1390         READ32(sess->fore_channel.nr_rdma_attrs);
1391         if (sess->fore_channel.nr_rdma_attrs == 1) {
1392                 READ_BUF(4);
1393                 READ32(sess->fore_channel.rdma_attrs);
1394         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1395                 dprintk("Too many fore channel attr bitmaps!\n");
1396                 goto xdr_error;
1397         }
1398
1399         /* Back channel attrs */
1400         READ_BUF(28);
1401         READ32(dummy); /* headerpadsz is always 0 */
1402         READ32(sess->back_channel.maxreq_sz);
1403         READ32(sess->back_channel.maxresp_sz);
1404         READ32(sess->back_channel.maxresp_cached);
1405         READ32(sess->back_channel.maxops);
1406         READ32(sess->back_channel.maxreqs);
1407         READ32(sess->back_channel.nr_rdma_attrs);
1408         if (sess->back_channel.nr_rdma_attrs == 1) {
1409                 READ_BUF(4);
1410                 READ32(sess->back_channel.rdma_attrs);
1411         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1412                 dprintk("Too many back channel attr bitmaps!\n");
1413                 goto xdr_error;
1414         }
1415
1416         READ_BUF(4);
1417         READ32(sess->callback_prog);
1418         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1419         DECODE_TAIL;
1420 }
1421
1422 static __be32
1423 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1424                              struct nfsd4_destroy_session *destroy_session)
1425 {
1426         DECODE_HEAD;
1427         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1428         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1429
1430         DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1435                           struct nfsd4_free_stateid *free_stateid)
1436 {
1437         DECODE_HEAD;
1438
1439         READ_BUF(sizeof(stateid_t));
1440         READ32(free_stateid->fr_stateid.si_generation);
1441         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1442
1443         DECODE_TAIL;
1444 }
1445
1446 static __be32
1447 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1448                       struct nfsd4_sequence *seq)
1449 {
1450         DECODE_HEAD;
1451
1452         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1453         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1454         READ32(seq->seqid);
1455         READ32(seq->slotid);
1456         READ32(seq->maxslots);
1457         READ32(seq->cachethis);
1458
1459         DECODE_TAIL;
1460 }
1461
1462 static __be32
1463 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1464 {
1465         int i;
1466         __be32 *p, status;
1467         struct nfsd4_test_stateid_id *stateid;
1468
1469         READ_BUF(4);
1470         test_stateid->ts_num_ids = ntohl(*p++);
1471
1472         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1473
1474         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1475                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1476                 if (!stateid) {
1477                         status = nfserrno(-ENOMEM);
1478                         goto out;
1479                 }
1480
1481                 defer_free(argp, kfree, stateid);
1482                 INIT_LIST_HEAD(&stateid->ts_id_list);
1483                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1484
1485                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1486                 if (status)
1487                         goto out;
1488         }
1489
1490         status = 0;
1491 out:
1492         return status;
1493 xdr_error:
1494         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1495         status = nfserr_bad_xdr;
1496         goto out;
1497 }
1498
1499 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1500 {
1501         DECODE_HEAD;
1502
1503         READ_BUF(8);
1504         COPYMEM(&dc->clientid, 8);
1505
1506         DECODE_TAIL;
1507 }
1508
1509 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1510 {
1511         DECODE_HEAD;
1512
1513         READ_BUF(4);
1514         READ32(rc->rca_one_fs);
1515
1516         DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1521 {
1522         return nfs_ok;
1523 }
1524
1525 static __be32
1526 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1527 {
1528         return nfserr_notsupp;
1529 }
1530
1531 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1532
1533 static nfsd4_dec nfsd4_dec_ops[] = {
1534         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1535         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1536         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1537         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1538         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1539         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1540         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1541         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1542         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1543         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1544         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1545         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1546         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1547         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1548         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1549         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1550         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1551         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1552         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1553         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1554         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1555         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1556         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1557         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1558         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1559         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1560         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1561         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1562         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1563         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1564         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1565         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1566         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1567         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1568         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1569         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1570         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1571
1572         /* new operations for NFSv4.1 */
1573         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1574         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1575         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1576         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1577         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1578         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1579         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1580         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1582         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1583         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1584         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1585         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1586         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1587         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1588         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1589         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1590         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1591         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1592 };
1593
1594 static inline bool
1595 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1596 {
1597         if (op->opnum < FIRST_NFS4_OP)
1598                 return false;
1599         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1600                 return false;
1601         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1602                 return false;
1603         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1604                 return false;
1605         return true;
1606 }
1607
1608 /*
1609  * Return a rough estimate of the maximum possible reply size.  Note the
1610  * estimate includes rpc headers so is meant to be passed to
1611  * svc_reserve, not svc_reserve_auth.
1612  *
1613  * Also note the current compound encoding permits only one operation to
1614  * use pages beyond the first one, so the maximum possible length is the
1615  * maximum over these values, not the sum.
1616  */
1617 static int nfsd4_max_reply(u32 opnum)
1618 {
1619         switch (opnum) {
1620         case OP_READLINK:
1621         case OP_READDIR:
1622                 /*
1623                  * Both of these ops take a single page for data and put
1624                  * the head and tail in another page:
1625                  */
1626                 return 2 * PAGE_SIZE;
1627         case OP_READ:
1628                 return INT_MAX;
1629         default:
1630                 return PAGE_SIZE;
1631         }
1632 }
1633
1634 static __be32
1635 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1636 {
1637         DECODE_HEAD;
1638         struct nfsd4_op *op;
1639         bool cachethis = false;
1640         int max_reply = PAGE_SIZE;
1641         int i;
1642
1643         READ_BUF(4);
1644         READ32(argp->taglen);
1645         READ_BUF(argp->taglen + 8);
1646         SAVEMEM(argp->tag, argp->taglen);
1647         READ32(argp->minorversion);
1648         READ32(argp->opcnt);
1649
1650         if (argp->taglen > NFSD4_MAX_TAGLEN)
1651                 goto xdr_error;
1652         if (argp->opcnt > 100)
1653                 goto xdr_error;
1654
1655         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1656                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1657                 if (!argp->ops) {
1658                         argp->ops = argp->iops;
1659                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1660                         goto xdr_error;
1661                 }
1662         }
1663
1664         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1665                 argp->opcnt = 0;
1666
1667         for (i = 0; i < argp->opcnt; i++) {
1668                 op = &argp->ops[i];
1669                 op->replay = NULL;
1670
1671                 READ_BUF(4);
1672                 READ32(op->opnum);
1673
1674                 if (nfsd4_opnum_in_range(argp, op))
1675                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1676                 else {
1677                         op->opnum = OP_ILLEGAL;
1678                         op->status = nfserr_op_illegal;
1679                 }
1680                 /*
1681                  * We'll try to cache the result in the DRC if any one
1682                  * op in the compound wants to be cached:
1683                  */
1684                 cachethis |= nfsd4_cache_this_op(op);
1685
1686                 max_reply = max(max_reply, nfsd4_max_reply(op->opnum));
1687
1688                 if (op->status) {
1689                         argp->opcnt = i+1;
1690                         break;
1691                 }
1692         }
1693         /* Sessions make the DRC unnecessary: */
1694         if (argp->minorversion)
1695                 cachethis = false;
1696         if (max_reply != INT_MAX)
1697                 svc_reserve(argp->rqstp, max_reply);
1698         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1699
1700         DECODE_TAIL;
1701 }
1702
1703 #define WRITE32(n)               *p++ = htonl(n)
1704 #define WRITE64(n)               do {                           \
1705         *p++ = htonl((u32)((n) >> 32));                         \
1706         *p++ = htonl((u32)(n));                                 \
1707 } while (0)
1708 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1709         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1710         memcpy(p, ptr, nbytes);                                 \
1711         p += XDR_QUADLEN(nbytes);                               \
1712 }} while (0)
1713
1714 static void write32(__be32 **p, u32 n)
1715 {
1716         *(*p)++ = htonl(n);
1717 }
1718
1719 static void write64(__be32 **p, u64 n)
1720 {
1721         write32(p, (n >> 32));
1722         write32(p, (u32)n);
1723 }
1724
1725 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1726 {
1727         if (IS_I_VERSION(inode)) {
1728                 write64(p, inode->i_version);
1729         } else {
1730                 write32(p, stat->ctime.tv_sec);
1731                 write32(p, stat->ctime.tv_nsec);
1732         }
1733 }
1734
1735 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1736 {
1737         write32(p, c->atomic);
1738         if (c->change_supported) {
1739                 write64(p, c->before_change);
1740                 write64(p, c->after_change);
1741         } else {
1742                 write32(p, c->before_ctime_sec);
1743                 write32(p, c->before_ctime_nsec);
1744                 write32(p, c->after_ctime_sec);
1745                 write32(p, c->after_ctime_nsec);
1746         }
1747 }
1748
1749 #define RESERVE_SPACE(nbytes)   do {                            \
1750         p = resp->xdr.p;                                                \
1751         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->xdr.end);                \
1752 } while (0)
1753 #define ADJUST_ARGS()           resp->xdr.p = p
1754
1755 /* Encode as an array of strings the string given with components
1756  * separated @sep, escaped with esc_enter and esc_exit.
1757  */
1758 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1759                                    __be32 **pp, int *buflen,
1760                                    char esc_enter, char esc_exit)
1761 {
1762         __be32 *p = *pp;
1763         __be32 *countp = p;
1764         int strlen, count=0;
1765         char *str, *end, *next;
1766
1767         dprintk("nfsd4_encode_components(%s)\n", components);
1768         if ((*buflen -= 4) < 0)
1769                 return nfserr_resource;
1770         WRITE32(0); /* We will fill this in with @count later */
1771         end = str = components;
1772         while (*end) {
1773                 bool found_esc = false;
1774
1775                 /* try to parse as esc_start, ..., esc_end, sep */
1776                 if (*str == esc_enter) {
1777                         for (; *end && (*end != esc_exit); end++)
1778                                 /* find esc_exit or end of string */;
1779                         next = end + 1;
1780                         if (*end && (!*next || *next == sep)) {
1781                                 str++;
1782                                 found_esc = true;
1783                         }
1784                 }
1785
1786                 if (!found_esc)
1787                         for (; *end && (*end != sep); end++)
1788                                 /* find sep or end of string */;
1789
1790                 strlen = end - str;
1791                 if (strlen) {
1792                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1793                                 return nfserr_resource;
1794                         WRITE32(strlen);
1795                         WRITEMEM(str, strlen);
1796                         count++;
1797                 }
1798                 else
1799                         end++;
1800                 str = end;
1801         }
1802         *pp = p;
1803         p = countp;
1804         WRITE32(count);
1805         return 0;
1806 }
1807
1808 /* Encode as an array of strings the string given with components
1809  * separated @sep.
1810  */
1811 static __be32 nfsd4_encode_components(char sep, char *components,
1812                                    __be32 **pp, int *buflen)
1813 {
1814         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1815 }
1816
1817 /*
1818  * encode a location element of a fs_locations structure
1819  */
1820 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1821                                     __be32 **pp, int *buflen)
1822 {
1823         __be32 status;
1824         __be32 *p = *pp;
1825
1826         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1827                                                 '[', ']');
1828         if (status)
1829                 return status;
1830         status = nfsd4_encode_components('/', location->path, &p, buflen);
1831         if (status)
1832                 return status;
1833         *pp = p;
1834         return 0;
1835 }
1836
1837 /*
1838  * Encode a path in RFC3530 'pathname4' format
1839  */
1840 static __be32 nfsd4_encode_path(const struct path *root,
1841                 const struct path *path, __be32 **pp, int *buflen)
1842 {
1843         struct path cur = *path;
1844         __be32 *p = *pp;
1845         struct dentry **components = NULL;
1846         unsigned int ncomponents = 0;
1847         __be32 err = nfserr_jukebox;
1848
1849         dprintk("nfsd4_encode_components(");
1850
1851         path_get(&cur);
1852         /* First walk the path up to the nfsd root, and store the
1853          * dentries/path components in an array.
1854          */
1855         for (;;) {
1856                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1857                         break;
1858                 if (cur.dentry == cur.mnt->mnt_root) {
1859                         if (follow_up(&cur))
1860                                 continue;
1861                         goto out_free;
1862                 }
1863                 if ((ncomponents & 15) == 0) {
1864                         struct dentry **new;
1865                         new = krealloc(components,
1866                                         sizeof(*new) * (ncomponents + 16),
1867                                         GFP_KERNEL);
1868                         if (!new)
1869                                 goto out_free;
1870                         components = new;
1871                 }
1872                 components[ncomponents++] = cur.dentry;
1873                 cur.dentry = dget_parent(cur.dentry);
1874         }
1875
1876         *buflen -= 4;
1877         if (*buflen < 0)
1878                 goto out_free;
1879         WRITE32(ncomponents);
1880
1881         while (ncomponents) {
1882                 struct dentry *dentry = components[ncomponents - 1];
1883                 unsigned int len;
1884
1885                 spin_lock(&dentry->d_lock);
1886                 len = dentry->d_name.len;
1887                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1888                 if (*buflen < 0) {
1889                         spin_unlock(&dentry->d_lock);
1890                         goto out_free;
1891                 }
1892                 WRITE32(len);
1893                 WRITEMEM(dentry->d_name.name, len);
1894                 dprintk("/%s", dentry->d_name.name);
1895                 spin_unlock(&dentry->d_lock);
1896                 dput(dentry);
1897                 ncomponents--;
1898         }
1899
1900         *pp = p;
1901         err = 0;
1902 out_free:
1903         dprintk(")\n");
1904         while (ncomponents)
1905                 dput(components[--ncomponents]);
1906         kfree(components);
1907         path_put(&cur);
1908         return err;
1909 }
1910
1911 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1912                 const struct path *path, __be32 **pp, int *buflen)
1913 {
1914         struct svc_export *exp_ps;
1915         __be32 res;
1916
1917         exp_ps = rqst_find_fsidzero_export(rqstp);
1918         if (IS_ERR(exp_ps))
1919                 return nfserrno(PTR_ERR(exp_ps));
1920         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1921         exp_put(exp_ps);
1922         return res;
1923 }
1924
1925 /*
1926  *  encode a fs_locations structure
1927  */
1928 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1929                                      struct svc_export *exp,
1930                                      __be32 **pp, int *buflen)
1931 {
1932         __be32 status;
1933         int i;
1934         __be32 *p = *pp;
1935         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1936
1937         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1938         if (status)
1939                 return status;
1940         if ((*buflen -= 4) < 0)
1941                 return nfserr_resource;
1942         WRITE32(fslocs->locations_count);
1943         for (i=0; i<fslocs->locations_count; i++) {
1944                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1945                                                    &p, buflen);
1946                 if (status)
1947                         return status;
1948         }
1949         *pp = p;
1950         return 0;
1951 }
1952
1953 static u32 nfs4_file_type(umode_t mode)
1954 {
1955         switch (mode & S_IFMT) {
1956         case S_IFIFO:   return NF4FIFO;
1957         case S_IFCHR:   return NF4CHR;
1958         case S_IFDIR:   return NF4DIR;
1959         case S_IFBLK:   return NF4BLK;
1960         case S_IFLNK:   return NF4LNK;
1961         case S_IFREG:   return NF4REG;
1962         case S_IFSOCK:  return NF4SOCK;
1963         default:        return NF4BAD;
1964         };
1965 }
1966
1967 static inline __be32
1968 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1969                 __be32 **p, int *buflen)
1970 {
1971         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1972                 return nfs4_acl_write_who(ace->whotype, p, buflen);
1973         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1974                 return nfsd4_encode_group(rqstp, ace->who_gid, p, buflen);
1975         else
1976                 return nfsd4_encode_user(rqstp, ace->who_uid, p, buflen);
1977 }
1978
1979 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1980                               FATTR4_WORD0_RDATTR_ERROR)
1981 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1982
1983 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1984 static inline __be32
1985 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
1986 {
1987         __be32 *p = *pp;
1988
1989         if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4))
1990                 return nfserr_resource;
1991
1992         /*
1993          * For now we use a 0 here to indicate the null translation; in
1994          * the future we may place a call to translation code here.
1995          */
1996         if ((*buflen -= 8) < 0)
1997                 return nfserr_resource;
1998
1999         WRITE32(0); /* lfs */
2000         WRITE32(0); /* pi */
2001         p = xdr_encode_opaque(p, context, len);
2002         *buflen -= (XDR_QUADLEN(len) << 2) + 4;
2003
2004         *pp = p;
2005         return 0;
2006 }
2007 #else
2008 static inline __be32
2009 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2010 { return 0; }
2011 #endif
2012
2013 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2014 {
2015         /* As per referral draft:  */
2016         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2017             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2018                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2019                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2020                         *rdattr_err = NFSERR_MOVED;
2021                 else
2022                         return nfserr_moved;
2023         }
2024         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2025         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2026         return 0;
2027 }
2028
2029
2030 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2031 {
2032         struct path path = exp->ex_path;
2033         int err;
2034
2035         path_get(&path);
2036         while (follow_up(&path)) {
2037                 if (path.dentry != path.mnt->mnt_root)
2038                         break;
2039         }
2040         err = vfs_getattr(&path, stat);
2041         path_put(&path);
2042         return err;
2043 }
2044
2045 /*
2046  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2047  * ourselves.
2048  */
2049 __be32
2050 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2051                 struct svc_export *exp,
2052                 struct dentry *dentry, u32 *bmval,
2053                 struct svc_rqst *rqstp, int ignore_crossmnt)
2054 {
2055         u32 bmval0 = bmval[0];
2056         u32 bmval1 = bmval[1];
2057         u32 bmval2 = bmval[2];
2058         struct kstat stat;
2059         struct svc_fh *tempfh = NULL;
2060         struct kstatfs statfs;
2061         __be32 *p = xdr->p;
2062         int buflen = xdr->buf->buflen;
2063         __be32 *attrlenp;
2064         u32 dummy;
2065         u64 dummy64;
2066         u32 rdattr_err = 0;
2067         __be32 status;
2068         int err;
2069         int aclsupport = 0;
2070         struct nfs4_acl *acl = NULL;
2071         void *context = NULL;
2072         int contextlen;
2073         bool contextsupport = false;
2074         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2075         u32 minorversion = resp->cstate.minorversion;
2076         struct path path = {
2077                 .mnt    = exp->ex_path.mnt,
2078                 .dentry = dentry,
2079         };
2080         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2081
2082         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2083         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2084         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2085         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2086
2087         if (exp->ex_fslocs.migrated) {
2088                 BUG_ON(bmval[2]);
2089                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2090                 if (status)
2091                         goto out;
2092         }
2093
2094         err = vfs_getattr(&path, &stat);
2095         if (err)
2096                 goto out_nfserr;
2097         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2098                         FATTR4_WORD0_MAXNAME)) ||
2099             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2100                        FATTR4_WORD1_SPACE_TOTAL))) {
2101                 err = vfs_statfs(&path, &statfs);
2102                 if (err)
2103                         goto out_nfserr;
2104         }
2105         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2106                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2107                 status = nfserr_jukebox;
2108                 if (!tempfh)
2109                         goto out;
2110                 fh_init(tempfh, NFS4_FHSIZE);
2111                 status = fh_compose(tempfh, exp, dentry, NULL);
2112                 if (status)
2113                         goto out;
2114                 fhp = tempfh;
2115         }
2116         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2117                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2118                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2119                 aclsupport = (err == 0);
2120                 if (bmval0 & FATTR4_WORD0_ACL) {
2121                         if (err == -EOPNOTSUPP)
2122                                 bmval0 &= ~FATTR4_WORD0_ACL;
2123                         else if (err == -EINVAL) {
2124                                 status = nfserr_attrnotsupp;
2125                                 goto out;
2126                         } else if (err != 0)
2127                                 goto out_nfserr;
2128                 }
2129         }
2130
2131 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2132         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2133                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2134                 err = security_inode_getsecctx(dentry->d_inode,
2135                                                 &context, &contextlen);
2136                 contextsupport = (err == 0);
2137                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2138                         if (err == -EOPNOTSUPP)
2139                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2140                         else if (err)
2141                                 goto out_nfserr;
2142                 }
2143         }
2144 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2145
2146         if (bmval2) {
2147                 if ((buflen -= 16) < 0)
2148                         goto out_resource;
2149                 WRITE32(3);
2150                 WRITE32(bmval0);
2151                 WRITE32(bmval1);
2152                 WRITE32(bmval2);
2153         } else if (bmval1) {
2154                 if ((buflen -= 12) < 0)
2155                         goto out_resource;
2156                 WRITE32(2);
2157                 WRITE32(bmval0);
2158                 WRITE32(bmval1);
2159         } else {
2160                 if ((buflen -= 8) < 0)
2161                         goto out_resource;
2162                 WRITE32(1);
2163                 WRITE32(bmval0);
2164         }
2165         attrlenp = p++;                /* to be backfilled later */
2166
2167         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2168                 u32 word0 = nfsd_suppattrs0(minorversion);
2169                 u32 word1 = nfsd_suppattrs1(minorversion);
2170                 u32 word2 = nfsd_suppattrs2(minorversion);
2171
2172                 if (!aclsupport)
2173                         word0 &= ~FATTR4_WORD0_ACL;
2174                 if (!contextsupport)
2175                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2176                 if (!word2) {
2177                         if ((buflen -= 12) < 0)
2178                                 goto out_resource;
2179                         WRITE32(2);
2180                         WRITE32(word0);
2181                         WRITE32(word1);
2182                 } else {
2183                         if ((buflen -= 16) < 0)
2184                                 goto out_resource;
2185                         WRITE32(3);
2186                         WRITE32(word0);
2187                         WRITE32(word1);
2188                         WRITE32(word2);
2189                 }
2190         }
2191         if (bmval0 & FATTR4_WORD0_TYPE) {
2192                 if ((buflen -= 4) < 0)
2193                         goto out_resource;
2194                 dummy = nfs4_file_type(stat.mode);
2195                 if (dummy == NF4BAD) {
2196                         status = nfserr_serverfault;
2197                         goto out;
2198                 }
2199                 WRITE32(dummy);
2200         }
2201         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2202                 if ((buflen -= 4) < 0)
2203                         goto out_resource;
2204                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2205                         WRITE32(NFS4_FH_PERSISTENT);
2206                 else
2207                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2208         }
2209         if (bmval0 & FATTR4_WORD0_CHANGE) {
2210                 if ((buflen -= 8) < 0)
2211                         goto out_resource;
2212                 write_change(&p, &stat, dentry->d_inode);
2213         }
2214         if (bmval0 & FATTR4_WORD0_SIZE) {
2215                 if ((buflen -= 8) < 0)
2216                         goto out_resource;
2217                 WRITE64(stat.size);
2218         }
2219         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2220                 if ((buflen -= 4) < 0)
2221                         goto out_resource;
2222                 WRITE32(1);
2223         }
2224         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2225                 if ((buflen -= 4) < 0)
2226                         goto out_resource;
2227                 WRITE32(1);
2228         }
2229         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2230                 if ((buflen -= 4) < 0)
2231                         goto out_resource;
2232                 WRITE32(0);
2233         }
2234         if (bmval0 & FATTR4_WORD0_FSID) {
2235                 if ((buflen -= 16) < 0)
2236                         goto out_resource;
2237                 if (exp->ex_fslocs.migrated) {
2238                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2239                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2240                 } else switch(fsid_source(fhp)) {
2241                 case FSIDSOURCE_FSID:
2242                         WRITE64((u64)exp->ex_fsid);
2243                         WRITE64((u64)0);
2244                         break;
2245                 case FSIDSOURCE_DEV:
2246                         WRITE32(0);
2247                         WRITE32(MAJOR(stat.dev));
2248                         WRITE32(0);
2249                         WRITE32(MINOR(stat.dev));
2250                         break;
2251                 case FSIDSOURCE_UUID:
2252                         WRITEMEM(exp->ex_uuid, 16);
2253                         break;
2254                 }
2255         }
2256         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2257                 if ((buflen -= 4) < 0)
2258                         goto out_resource;
2259                 WRITE32(0);
2260         }
2261         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2262                 if ((buflen -= 4) < 0)
2263                         goto out_resource;
2264                 WRITE32(nn->nfsd4_lease);
2265         }
2266         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2267                 if ((buflen -= 4) < 0)
2268                         goto out_resource;
2269                 WRITE32(rdattr_err);
2270         }
2271         if (bmval0 & FATTR4_WORD0_ACL) {
2272                 struct nfs4_ace *ace;
2273
2274                 if (acl == NULL) {
2275                         if ((buflen -= 4) < 0)
2276                                 goto out_resource;
2277
2278                         WRITE32(0);
2279                         goto out_acl;
2280                 }
2281                 if ((buflen -= 4) < 0)
2282                         goto out_resource;
2283                 WRITE32(acl->naces);
2284
2285                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2286                         if ((buflen -= 4*3) < 0)
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(rqstp, ace, &p, &buflen);
2292                         if (status)
2293                                 goto out;
2294                 }
2295         }
2296 out_acl:
2297         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2298                 if ((buflen -= 4) < 0)
2299                         goto out_resource;
2300                 WRITE32(aclsupport ?
2301                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2302         }
2303         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2304                 if ((buflen -= 4) < 0)
2305                         goto out_resource;
2306                 WRITE32(1);
2307         }
2308         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2309                 if ((buflen -= 4) < 0)
2310                         goto out_resource;
2311                 WRITE32(0);
2312         }
2313         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2314                 if ((buflen -= 4) < 0)
2315                         goto out_resource;
2316                 WRITE32(1);
2317         }
2318         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2319                 if ((buflen -= 4) < 0)
2320                         goto out_resource;
2321                 WRITE32(1);
2322         }
2323         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2324                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2325                 if (buflen < 0)
2326                         goto out_resource;
2327                 WRITE32(fhp->fh_handle.fh_size);
2328                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2329         }
2330         if (bmval0 & FATTR4_WORD0_FILEID) {
2331                 if ((buflen -= 8) < 0)
2332                         goto out_resource;
2333                 WRITE64(stat.ino);
2334         }
2335         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2336                 if ((buflen -= 8) < 0)
2337                         goto out_resource;
2338                 WRITE64((u64) statfs.f_ffree);
2339         }
2340         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2341                 if ((buflen -= 8) < 0)
2342                         goto out_resource;
2343                 WRITE64((u64) statfs.f_ffree);
2344         }
2345         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2346                 if ((buflen -= 8) < 0)
2347                         goto out_resource;
2348                 WRITE64((u64) statfs.f_files);
2349         }
2350         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2351                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2352                 if (status)
2353                         goto out;
2354         }
2355         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2356                 if ((buflen -= 4) < 0)
2357                         goto out_resource;
2358                 WRITE32(1);
2359         }
2360         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2361                 if ((buflen -= 8) < 0)
2362                         goto out_resource;
2363                 WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
2364         }
2365         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2366                 if ((buflen -= 4) < 0)
2367                         goto out_resource;
2368                 WRITE32(255);
2369         }
2370         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2371                 if ((buflen -= 4) < 0)
2372                         goto out_resource;
2373                 WRITE32(statfs.f_namelen);
2374         }
2375         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2376                 if ((buflen -= 8) < 0)
2377                         goto out_resource;
2378                 WRITE64((u64) svc_max_payload(rqstp));
2379         }
2380         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2381                 if ((buflen -= 8) < 0)
2382                         goto out_resource;
2383                 WRITE64((u64) svc_max_payload(rqstp));
2384         }
2385         if (bmval1 & FATTR4_WORD1_MODE) {
2386                 if ((buflen -= 4) < 0)
2387                         goto out_resource;
2388                 WRITE32(stat.mode & S_IALLUGO);
2389         }
2390         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2391                 if ((buflen -= 4) < 0)
2392                         goto out_resource;
2393                 WRITE32(1);
2394         }
2395         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2396                 if ((buflen -= 4) < 0)
2397                         goto out_resource;
2398                 WRITE32(stat.nlink);
2399         }
2400         if (bmval1 & FATTR4_WORD1_OWNER) {
2401                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2402                 if (status)
2403                         goto out;
2404         }
2405         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2406                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2407                 if (status)
2408                         goto out;
2409         }
2410         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2411                 if ((buflen -= 8) < 0)
2412                         goto out_resource;
2413                 WRITE32((u32) MAJOR(stat.rdev));
2414                 WRITE32((u32) MINOR(stat.rdev));
2415         }
2416         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2417                 if ((buflen -= 8) < 0)
2418                         goto out_resource;
2419                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2420                 WRITE64(dummy64);
2421         }
2422         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2423                 if ((buflen -= 8) < 0)
2424                         goto out_resource;
2425                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2426                 WRITE64(dummy64);
2427         }
2428         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2429                 if ((buflen -= 8) < 0)
2430                         goto out_resource;
2431                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2432                 WRITE64(dummy64);
2433         }
2434         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2435                 if ((buflen -= 8) < 0)
2436                         goto out_resource;
2437                 dummy64 = (u64)stat.blocks << 9;
2438                 WRITE64(dummy64);
2439         }
2440         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2441                 if ((buflen -= 12) < 0)
2442                         goto out_resource;
2443                 WRITE64((s64)stat.atime.tv_sec);
2444                 WRITE32(stat.atime.tv_nsec);
2445         }
2446         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2447                 if ((buflen -= 12) < 0)
2448                         goto out_resource;
2449                 WRITE32(0);
2450                 WRITE32(1);
2451                 WRITE32(0);
2452         }
2453         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2454                 if ((buflen -= 12) < 0)
2455                         goto out_resource;
2456                 WRITE64((s64)stat.ctime.tv_sec);
2457                 WRITE32(stat.ctime.tv_nsec);
2458         }
2459         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2460                 if ((buflen -= 12) < 0)
2461                         goto out_resource;
2462                 WRITE64((s64)stat.mtime.tv_sec);
2463                 WRITE32(stat.mtime.tv_nsec);
2464         }
2465         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2466                 if ((buflen -= 8) < 0)
2467                         goto out_resource;
2468                 /*
2469                  * Get parent's attributes if not ignoring crossmount
2470                  * and this is the root of a cross-mounted filesystem.
2471                  */
2472                 if (ignore_crossmnt == 0 &&
2473                     dentry == exp->ex_path.mnt->mnt_root)
2474                         get_parent_attributes(exp, &stat);
2475                 WRITE64(stat.ino);
2476         }
2477         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2478                 status = nfsd4_encode_security_label(rqstp, context,
2479                                 contextlen, &p, &buflen);
2480                 if (status)
2481                         goto out;
2482         }
2483         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2484                 if ((buflen -= 16) < 0)
2485                         goto out_resource;
2486                 WRITE32(3);
2487                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2488                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2489                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2490         }
2491
2492         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2493         xdr->p = p;
2494         status = nfs_ok;
2495
2496 out:
2497 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2498         if (context)
2499                 security_release_secctx(context, contextlen);
2500 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2501         kfree(acl);
2502         if (tempfh) {
2503                 fh_put(tempfh);
2504                 kfree(tempfh);
2505         }
2506         return status;
2507 out_nfserr:
2508         status = nfserrno(err);
2509         goto out;
2510 out_resource:
2511         status = nfserr_resource;
2512         goto out;
2513 }
2514
2515 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2516                         struct svc_fh *fhp, struct svc_export *exp,
2517                         struct dentry *dentry, u32 *bmval,
2518                         struct svc_rqst *rqstp, int ignore_crossmnt)
2519 {
2520         struct xdr_buf dummy = {
2521                         .head[0] = {
2522                                 .iov_base = *p,
2523                         },
2524                         .buflen = words << 2,
2525                 };
2526         struct xdr_stream xdr;
2527         __be32 ret;
2528
2529         xdr_init_encode(&xdr, &dummy, NULL);
2530         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2531                                                         ignore_crossmnt);
2532         *p = xdr.p;
2533         return ret;
2534 }
2535
2536 static inline int attributes_need_mount(u32 *bmval)
2537 {
2538         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2539                 return 1;
2540         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2541                 return 1;
2542         return 0;
2543 }
2544
2545 static __be32
2546 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2547                 const char *name, int namlen, __be32 **p, int buflen)
2548 {
2549         struct svc_export *exp = cd->rd_fhp->fh_export;
2550         struct dentry *dentry;
2551         __be32 nfserr;
2552         int ignore_crossmnt = 0;
2553
2554         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2555         if (IS_ERR(dentry))
2556                 return nfserrno(PTR_ERR(dentry));
2557         if (!dentry->d_inode) {
2558                 /*
2559                  * nfsd_buffered_readdir drops the i_mutex between
2560                  * readdir and calling this callback, leaving a window
2561                  * where this directory entry could have gone away.
2562                  */
2563                 dput(dentry);
2564                 return nfserr_noent;
2565         }
2566
2567         exp_get(exp);
2568         /*
2569          * In the case of a mountpoint, the client may be asking for
2570          * attributes that are only properties of the underlying filesystem
2571          * as opposed to the cross-mounted file system. In such a case,
2572          * we will not follow the cross mount and will fill the attribtutes
2573          * directly from the mountpoint dentry.
2574          */
2575         if (nfsd_mountpoint(dentry, exp)) {
2576                 int err;
2577
2578                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2579                                 && !attributes_need_mount(cd->rd_bmval)) {
2580                         ignore_crossmnt = 1;
2581                         goto out_encode;
2582                 }
2583                 /*
2584                  * Why the heck aren't we just using nfsd_lookup??
2585                  * Different "."/".." handling?  Something else?
2586                  * At least, add a comment here to explain....
2587                  */
2588                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2589                 if (err) {
2590                         nfserr = nfserrno(err);
2591                         goto out_put;
2592                 }
2593                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2594                 if (nfserr)
2595                         goto out_put;
2596
2597         }
2598 out_encode:
2599         nfserr = nfsd4_encode_fattr_to_buf(p, buflen, NULL, exp, dentry,
2600                                         cd->rd_bmval,
2601                                         cd->rd_rqstp, ignore_crossmnt);
2602 out_put:
2603         dput(dentry);
2604         exp_put(exp);
2605         return nfserr;
2606 }
2607
2608 static __be32 *
2609 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2610 {
2611         if (buflen < 6)
2612                 return NULL;
2613         *p++ = htonl(2);
2614         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2615         *p++ = htonl(0);                         /* bmval1 */
2616
2617         *p++ = htonl(4);     /* attribute length */
2618         *p++ = nfserr;       /* no htonl */
2619         return p;
2620 }
2621
2622 static int
2623 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2624                     loff_t offset, u64 ino, unsigned int d_type)
2625 {
2626         struct readdir_cd *ccd = ccdv;
2627         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2628         int buflen;
2629         __be32 *p = cd->buffer;
2630         __be32 *cookiep;
2631         __be32 nfserr = nfserr_toosmall;
2632
2633         /* In nfsv4, "." and ".." never make it onto the wire.. */
2634         if (name && isdotent(name, namlen)) {
2635                 cd->common.err = nfs_ok;
2636                 return 0;
2637         }
2638
2639         if (cd->offset)
2640                 xdr_encode_hyper(cd->offset, (u64) offset);
2641
2642         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2643         if (buflen < 0)
2644                 goto fail;
2645
2646         *p++ = xdr_one;                             /* mark entry present */
2647         cookiep = p;
2648         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2649         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2650
2651         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2652         switch (nfserr) {
2653         case nfs_ok:
2654                 break;
2655         case nfserr_resource:
2656                 nfserr = nfserr_toosmall;
2657                 goto fail;
2658         case nfserr_noent:
2659                 goto skip_entry;
2660         default:
2661                 /*
2662                  * If the client requested the RDATTR_ERROR attribute,
2663                  * we stuff the error code into this attribute
2664                  * and continue.  If this attribute was not requested,
2665                  * then in accordance with the spec, we fail the
2666                  * entire READDIR operation(!)
2667                  */
2668                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2669                         goto fail;
2670                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2671                 if (p == NULL) {
2672                         nfserr = nfserr_toosmall;
2673                         goto fail;
2674                 }
2675         }
2676         cd->buflen -= (p - cd->buffer);
2677         cd->buffer = p;
2678         cd->offset = cookiep;
2679 skip_entry:
2680         cd->common.err = nfs_ok;
2681         return 0;
2682 fail:
2683         cd->common.err = nfserr;
2684         return -EINVAL;
2685 }
2686
2687 static void
2688 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2689 {
2690         __be32 *p;
2691
2692         RESERVE_SPACE(sizeof(stateid_t));
2693         WRITE32(sid->si_generation);
2694         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2695         ADJUST_ARGS();
2696 }
2697
2698 static __be32
2699 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2700 {
2701         __be32 *p;
2702
2703         if (!nfserr) {
2704                 RESERVE_SPACE(8);
2705                 WRITE32(access->ac_supported);
2706                 WRITE32(access->ac_resp_access);
2707                 ADJUST_ARGS();
2708         }
2709         return nfserr;
2710 }
2711
2712 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2713 {
2714         __be32 *p;
2715
2716         if (!nfserr) {
2717                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2718                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2719                 WRITE32(bcts->dir);
2720                 /* Sorry, we do not yet support RDMA over 4.1: */
2721                 WRITE32(0);
2722                 ADJUST_ARGS();
2723         }
2724         return nfserr;
2725 }
2726
2727 static __be32
2728 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2729 {
2730         if (!nfserr)
2731                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2732
2733         return nfserr;
2734 }
2735
2736
2737 static __be32
2738 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2739 {
2740         __be32 *p;
2741
2742         if (!nfserr) {
2743                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2744                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2745                 ADJUST_ARGS();
2746         }
2747         return nfserr;
2748 }
2749
2750 static __be32
2751 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2752 {
2753         __be32 *p;
2754
2755         if (!nfserr) {
2756                 RESERVE_SPACE(32);
2757                 write_cinfo(&p, &create->cr_cinfo);
2758                 WRITE32(2);
2759                 WRITE32(create->cr_bmval[0]);
2760                 WRITE32(create->cr_bmval[1]);
2761                 ADJUST_ARGS();
2762         }
2763         return nfserr;
2764 }
2765
2766 static __be32
2767 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2768 {
2769         struct svc_fh *fhp = getattr->ga_fhp;
2770         struct xdr_stream *xdr = &resp->xdr;
2771         struct xdr_buf *buf = resp->xdr.buf;
2772
2773         if (nfserr)
2774                 return nfserr;
2775
2776         buf->buflen = (void *)resp->xdr.end - (void *)resp->xdr.p
2777                         - COMPOUND_ERR_SLACK_SPACE;
2778         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2779                                     getattr->ga_bmval,
2780                                     resp->rqstp, 0);
2781         return nfserr;
2782 }
2783
2784 static __be32
2785 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2786 {
2787         struct svc_fh *fhp = *fhpp;
2788         unsigned int len;
2789         __be32 *p;
2790
2791         if (!nfserr) {
2792                 len = fhp->fh_handle.fh_size;
2793                 RESERVE_SPACE(len + 4);
2794                 WRITE32(len);
2795                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2796                 ADJUST_ARGS();
2797         }
2798         return nfserr;
2799 }
2800
2801 /*
2802 * Including all fields other than the name, a LOCK4denied structure requires
2803 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2804 */
2805 static void
2806 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2807 {
2808         struct xdr_netobj *conf = &ld->ld_owner;
2809         __be32 *p;
2810
2811         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2812         WRITE64(ld->ld_start);
2813         WRITE64(ld->ld_length);
2814         WRITE32(ld->ld_type);
2815         if (conf->len) {
2816                 WRITEMEM(&ld->ld_clientid, 8);
2817                 WRITE32(conf->len);
2818                 WRITEMEM(conf->data, conf->len);
2819                 kfree(conf->data);
2820         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2821                 WRITE64((u64)0); /* clientid */
2822                 WRITE32(0); /* length of owner name */
2823         }
2824         ADJUST_ARGS();
2825 }
2826
2827 static __be32
2828 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2829 {
2830         if (!nfserr)
2831                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2832         else if (nfserr == nfserr_denied)
2833                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2834
2835         return nfserr;
2836 }
2837
2838 static __be32
2839 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2840 {
2841         if (nfserr == nfserr_denied)
2842                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2843         return nfserr;
2844 }
2845
2846 static __be32
2847 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2848 {
2849         if (!nfserr)
2850                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2851
2852         return nfserr;
2853 }
2854
2855
2856 static __be32
2857 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2858 {
2859         __be32 *p;
2860
2861         if (!nfserr) {
2862                 RESERVE_SPACE(20);
2863                 write_cinfo(&p, &link->li_cinfo);
2864                 ADJUST_ARGS();
2865         }
2866         return nfserr;
2867 }
2868
2869
2870 static __be32
2871 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2872 {
2873         __be32 *p;
2874
2875         if (nfserr)
2876                 goto out;
2877
2878         nfsd4_encode_stateid(resp, &open->op_stateid);
2879         RESERVE_SPACE(40);
2880         write_cinfo(&p, &open->op_cinfo);
2881         WRITE32(open->op_rflags);
2882         WRITE32(2);
2883         WRITE32(open->op_bmval[0]);
2884         WRITE32(open->op_bmval[1]);
2885         WRITE32(open->op_delegate_type);
2886         ADJUST_ARGS();
2887
2888         switch (open->op_delegate_type) {
2889         case NFS4_OPEN_DELEGATE_NONE:
2890                 break;
2891         case NFS4_OPEN_DELEGATE_READ:
2892                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2893                 RESERVE_SPACE(20);
2894                 WRITE32(open->op_recall);
2895
2896                 /*
2897                  * TODO: ACE's in delegations
2898                  */
2899                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2900                 WRITE32(0);
2901                 WRITE32(0);
2902                 WRITE32(0);   /* XXX: is NULL principal ok? */
2903                 ADJUST_ARGS();
2904                 break;
2905         case NFS4_OPEN_DELEGATE_WRITE:
2906                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2907                 RESERVE_SPACE(32);
2908                 WRITE32(0);
2909
2910                 /*
2911                  * TODO: space_limit's in delegations
2912                  */
2913                 WRITE32(NFS4_LIMIT_SIZE);
2914                 WRITE32(~(u32)0);
2915                 WRITE32(~(u32)0);
2916
2917                 /*
2918                  * TODO: ACE's in delegations
2919                  */
2920                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2921                 WRITE32(0);
2922                 WRITE32(0);
2923                 WRITE32(0);   /* XXX: is NULL principal ok? */
2924                 ADJUST_ARGS();
2925                 break;
2926         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2927                 switch (open->op_why_no_deleg) {
2928                 case WND4_CONTENTION:
2929                 case WND4_RESOURCE:
2930                         RESERVE_SPACE(8);
2931                         WRITE32(open->op_why_no_deleg);
2932                         WRITE32(0);     /* deleg signaling not supported yet */
2933                         break;
2934                 default:
2935                         RESERVE_SPACE(4);
2936                         WRITE32(open->op_why_no_deleg);
2937                 }
2938                 ADJUST_ARGS();
2939                 break;
2940         default:
2941                 BUG();
2942         }
2943         /* XXX save filehandle here */
2944 out:
2945         return nfserr;
2946 }
2947
2948 static __be32
2949 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2950 {
2951         if (!nfserr)
2952                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2953
2954         return nfserr;
2955 }
2956
2957 static __be32
2958 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2959 {
2960         if (!nfserr)
2961                 nfsd4_encode_stateid(resp, &od->od_stateid);
2962
2963         return nfserr;
2964 }
2965
2966 static __be32
2967 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2968                   struct nfsd4_read *read)
2969 {
2970         u32 eof;
2971         int v;
2972         struct page *page;
2973         unsigned long maxcount;
2974         long len;
2975         __be32 *p;
2976
2977         if (nfserr)
2978                 return nfserr;
2979         if (resp->xdr.buf->page_len)
2980                 return nfserr_resource;
2981
2982         RESERVE_SPACE(8); /* eof flag and byte count */
2983
2984         maxcount = svc_max_payload(resp->rqstp);
2985         if (maxcount > read->rd_length)
2986                 maxcount = read->rd_length;
2987
2988         len = maxcount;
2989         v = 0;
2990         while (len > 0) {
2991                 page = *(resp->rqstp->rq_next_page);
2992                 if (!page) { /* ran out of pages */
2993                         maxcount -= len;
2994                         break;
2995                 }
2996                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2997                 resp->rqstp->rq_vec[v].iov_len =
2998                         len < PAGE_SIZE ? len : PAGE_SIZE;
2999                 resp->rqstp->rq_next_page++;
3000                 v++;
3001                 len -= PAGE_SIZE;
3002         }
3003         read->rd_vlen = v;
3004
3005         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3006                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
3007                         &maxcount);
3008
3009         if (nfserr)
3010                 return nfserr;
3011         eof = (read->rd_offset + maxcount >=
3012                read->rd_fhp->fh_dentry->d_inode->i_size);
3013
3014         WRITE32(eof);
3015         WRITE32(maxcount);
3016         ADJUST_ARGS();
3017         resp->xdr.buf->head[0].iov_len = (char *)p
3018                                 - (char *)resp->xdr.buf->head[0].iov_base;
3019         resp->xdr.buf->page_len = maxcount;
3020
3021         /* Use rest of head for padding and remaining ops: */
3022         resp->xdr.buf->tail[0].iov_base = p;
3023         resp->xdr.buf->tail[0].iov_len = 0;
3024         if (maxcount&3) {
3025                 RESERVE_SPACE(4);
3026                 WRITE32(0);
3027                 resp->xdr.buf->tail[0].iov_base += maxcount&3;
3028                 resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3029                 ADJUST_ARGS();
3030         }
3031         return 0;
3032 }
3033
3034 static __be32
3035 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3036 {
3037         int maxcount;
3038         char *page;
3039         __be32 *p;
3040
3041         if (nfserr)
3042                 return nfserr;
3043         if (resp->xdr.buf->page_len)
3044                 return nfserr_resource;
3045         if (!*resp->rqstp->rq_next_page)
3046                 return nfserr_resource;
3047
3048         page = page_address(*(resp->rqstp->rq_next_page++));
3049
3050         maxcount = PAGE_SIZE;
3051         RESERVE_SPACE(4);
3052
3053         /*
3054          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3055          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3056          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3057          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3058          */
3059         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3060         if (nfserr == nfserr_isdir)
3061                 return nfserr_inval;
3062         if (nfserr)
3063                 return nfserr;
3064
3065         WRITE32(maxcount);
3066         ADJUST_ARGS();
3067         resp->xdr.buf->head[0].iov_len = (char *)p
3068                                 - (char *)resp->xdr.buf->head[0].iov_base;
3069         resp->xdr.buf->page_len = maxcount;
3070
3071         /* Use rest of head for padding and remaining ops: */
3072         resp->xdr.buf->tail[0].iov_base = p;
3073         resp->xdr.buf->tail[0].iov_len = 0;
3074         if (maxcount&3) {
3075                 RESERVE_SPACE(4);
3076                 WRITE32(0);
3077                 resp->xdr.buf->tail[0].iov_base += maxcount&3;
3078                 resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3079                 ADJUST_ARGS();
3080         }
3081         return 0;
3082 }
3083
3084 static __be32
3085 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3086 {
3087         int maxcount;
3088         loff_t offset;
3089         __be32 *page, *savep, *tailbase;
3090         __be32 *p;
3091
3092         if (nfserr)
3093                 return nfserr;
3094         if (resp->xdr.buf->page_len)
3095                 return nfserr_resource;
3096         if (!*resp->rqstp->rq_next_page)
3097                 return nfserr_resource;
3098
3099         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3100         savep = p;
3101
3102         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3103         WRITE32(0);
3104         WRITE32(0);
3105         ADJUST_ARGS();
3106         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3107                                 - (char *)resp->xdr.buf->head[0].iov_base;
3108         tailbase = p;
3109
3110         maxcount = PAGE_SIZE;
3111         if (maxcount > readdir->rd_maxcount)
3112                 maxcount = readdir->rd_maxcount;
3113
3114         /*
3115          * Convert from bytes to words, account for the two words already
3116          * written, make sure to leave two words at the end for the next
3117          * pointer and eof field.
3118          */
3119         maxcount = (maxcount >> 2) - 4;
3120         if (maxcount < 0) {
3121                 nfserr =  nfserr_toosmall;
3122                 goto err_no_verf;
3123         }
3124
3125         page = page_address(*(resp->rqstp->rq_next_page++));
3126         readdir->common.err = 0;
3127         readdir->buflen = maxcount;
3128         readdir->buffer = page;
3129         readdir->offset = NULL;
3130
3131         offset = readdir->rd_cookie;
3132         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3133                               &offset,
3134                               &readdir->common, nfsd4_encode_dirent);
3135         if (nfserr == nfs_ok &&
3136             readdir->common.err == nfserr_toosmall &&
3137             readdir->buffer == page)
3138                 nfserr = nfserr_toosmall;
3139         if (nfserr)
3140                 goto err_no_verf;
3141
3142         if (readdir->offset)
3143                 xdr_encode_hyper(readdir->offset, offset);
3144
3145         p = readdir->buffer;
3146         *p++ = 0;       /* no more entries */
3147         *p++ = htonl(readdir->common.err == nfserr_eof);
3148         resp->xdr.buf->page_len = ((char *)p) -
3149                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3150
3151         /* Use rest of head for padding and remaining ops: */
3152         resp->xdr.buf->tail[0].iov_base = tailbase;
3153         resp->xdr.buf->tail[0].iov_len = 0;
3154         resp->xdr.p = resp->xdr.buf->tail[0].iov_base;
3155         resp->xdr.end = resp->xdr.p +
3156                         (PAGE_SIZE - resp->xdr.buf->head[0].iov_len)/4;
3157
3158         return 0;
3159 err_no_verf:
3160         p = savep;
3161         ADJUST_ARGS();
3162         return nfserr;
3163 }
3164
3165 static __be32
3166 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3167 {
3168         __be32 *p;
3169
3170         if (!nfserr) {
3171                 RESERVE_SPACE(20);
3172                 write_cinfo(&p, &remove->rm_cinfo);
3173                 ADJUST_ARGS();
3174         }
3175         return nfserr;
3176 }
3177
3178 static __be32
3179 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3180 {
3181         __be32 *p;
3182
3183         if (!nfserr) {
3184                 RESERVE_SPACE(40);
3185                 write_cinfo(&p, &rename->rn_sinfo);
3186                 write_cinfo(&p, &rename->rn_tinfo);
3187                 ADJUST_ARGS();
3188         }
3189         return nfserr;
3190 }
3191
3192 static __be32
3193 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3194                          __be32 nfserr, struct svc_export *exp)
3195 {
3196         u32 i, nflavs, supported;
3197         struct exp_flavor_info *flavs;
3198         struct exp_flavor_info def_flavs[2];
3199         __be32 *p, *flavorsp;
3200         static bool report = true;
3201
3202         if (nfserr)
3203                 goto out;
3204         if (exp->ex_nflavors) {
3205                 flavs = exp->ex_flavors;
3206                 nflavs = exp->ex_nflavors;
3207         } else { /* Handling of some defaults in absence of real secinfo: */
3208                 flavs = def_flavs;
3209                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3210                         nflavs = 2;
3211                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3212                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3213                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3214                         nflavs = 1;
3215                         flavs[0].pseudoflavor
3216                                         = svcauth_gss_flavor(exp->ex_client);
3217                 } else {
3218                         nflavs = 1;
3219                         flavs[0].pseudoflavor
3220                                         = exp->ex_client->flavour->flavour;
3221                 }
3222         }
3223
3224         supported = 0;
3225         RESERVE_SPACE(4);
3226         flavorsp = p++;         /* to be backfilled later */
3227         ADJUST_ARGS();
3228
3229         for (i = 0; i < nflavs; i++) {
3230                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3231                 struct rpcsec_gss_info info;
3232
3233                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3234                         supported++;
3235                         RESERVE_SPACE(4 + 4 + XDR_LEN(info.oid.len) + 4 + 4);
3236                         WRITE32(RPC_AUTH_GSS);
3237                         WRITE32(info.oid.len);
3238                         WRITEMEM(info.oid.data, info.oid.len);
3239                         WRITE32(info.qop);
3240                         WRITE32(info.service);
3241                         ADJUST_ARGS();
3242                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3243                         supported++;
3244                         RESERVE_SPACE(4);
3245                         WRITE32(pf);
3246                         ADJUST_ARGS();
3247                 } else {
3248                         if (report)
3249                                 pr_warn("NFS: SECINFO: security flavor %u "
3250                                         "is not supported\n", pf);
3251                 }
3252         }
3253
3254         if (nflavs != supported)
3255                 report = false;
3256         *flavorsp = htonl(supported);
3257
3258 out:
3259         if (exp)
3260                 exp_put(exp);
3261         return nfserr;
3262 }
3263
3264 static __be32
3265 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3266                      struct nfsd4_secinfo *secinfo)
3267 {
3268         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3269 }
3270
3271 static __be32
3272 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3273                      struct nfsd4_secinfo_no_name *secinfo)
3274 {
3275         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3276 }
3277
3278 /*
3279  * The SETATTR encode routine is special -- it always encodes a bitmap,
3280  * regardless of the error status.
3281  */
3282 static __be32
3283 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3284 {
3285         __be32 *p;
3286
3287         RESERVE_SPACE(16);
3288         if (nfserr) {
3289                 WRITE32(3);
3290                 WRITE32(0);
3291                 WRITE32(0);
3292                 WRITE32(0);
3293         }
3294         else {
3295                 WRITE32(3);
3296                 WRITE32(setattr->sa_bmval[0]);
3297                 WRITE32(setattr->sa_bmval[1]);
3298                 WRITE32(setattr->sa_bmval[2]);
3299         }
3300         ADJUST_ARGS();
3301         return nfserr;
3302 }
3303
3304 static __be32
3305 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3306 {
3307         __be32 *p;
3308
3309         if (!nfserr) {
3310                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3311                 WRITEMEM(&scd->se_clientid, 8);
3312                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3313                 ADJUST_ARGS();
3314         }
3315         else if (nfserr == nfserr_clid_inuse) {
3316                 RESERVE_SPACE(8);
3317                 WRITE32(0);
3318                 WRITE32(0);
3319                 ADJUST_ARGS();
3320         }
3321         return nfserr;
3322 }
3323
3324 static __be32
3325 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3326 {
3327         __be32 *p;
3328
3329         if (!nfserr) {
3330                 RESERVE_SPACE(16);
3331                 WRITE32(write->wr_bytes_written);
3332                 WRITE32(write->wr_how_written);
3333                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3334                 ADJUST_ARGS();
3335         }
3336         return nfserr;
3337 }
3338
3339 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3340         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3341               1 << (OP_EXCHANGE_ID - 32) |
3342               1 << (OP_CREATE_SESSION - 32) |
3343               1 << (OP_DESTROY_SESSION - 32) |
3344               1 << (OP_DESTROY_CLIENTID - 32)
3345 };
3346
3347 static __be32
3348 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3349                          struct nfsd4_exchange_id *exid)
3350 {
3351         __be32 *p;
3352         char *major_id;
3353         char *server_scope;
3354         int major_id_sz;
3355         int server_scope_sz;
3356         uint64_t minor_id = 0;
3357
3358         if (nfserr)
3359                 return nfserr;
3360
3361         major_id = utsname()->nodename;
3362         major_id_sz = strlen(major_id);
3363         server_scope = utsname()->nodename;
3364         server_scope_sz = strlen(server_scope);
3365
3366         RESERVE_SPACE(
3367                 8 /* eir_clientid */ +
3368                 4 /* eir_sequenceid */ +
3369                 4 /* eir_flags */ +
3370                 4 /* spr_how */);
3371
3372         WRITEMEM(&exid->clientid, 8);
3373         WRITE32(exid->seqid);
3374         WRITE32(exid->flags);
3375
3376         WRITE32(exid->spa_how);
3377         ADJUST_ARGS();
3378
3379         switch (exid->spa_how) {
3380         case SP4_NONE:
3381                 break;
3382         case SP4_MACH_CRED:
3383                 /* spo_must_enforce, spo_must_allow */
3384                 RESERVE_SPACE(16);
3385
3386                 /* spo_must_enforce bitmap: */
3387                 WRITE32(2);
3388                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3389                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3390                 /* empty spo_must_allow bitmap: */
3391                 WRITE32(0);
3392
3393                 ADJUST_ARGS();
3394                 break;
3395         default:
3396                 WARN_ON_ONCE(1);
3397         }
3398
3399         RESERVE_SPACE(
3400                 8 /* so_minor_id */ +
3401                 4 /* so_major_id.len */ +
3402                 (XDR_QUADLEN(major_id_sz) * 4) +
3403                 4 /* eir_server_scope.len */ +
3404                 (XDR_QUADLEN(server_scope_sz) * 4) +
3405                 4 /* eir_server_impl_id.count (0) */);
3406
3407         /* The server_owner struct */
3408         WRITE64(minor_id);      /* Minor id */
3409         /* major id */
3410         WRITE32(major_id_sz);
3411         WRITEMEM(major_id, major_id_sz);
3412
3413         /* Server scope */
3414         WRITE32(server_scope_sz);
3415         WRITEMEM(server_scope, server_scope_sz);
3416
3417         /* Implementation id */
3418         WRITE32(0);     /* zero length nfs_impl_id4 array */
3419         ADJUST_ARGS();
3420         return 0;
3421 }
3422
3423 static __be32
3424 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3425                             struct nfsd4_create_session *sess)
3426 {
3427         __be32 *p;
3428
3429         if (nfserr)
3430                 return nfserr;
3431
3432         RESERVE_SPACE(24);
3433         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3434         WRITE32(sess->seqid);
3435         WRITE32(sess->flags);
3436         ADJUST_ARGS();
3437
3438         RESERVE_SPACE(28);
3439         WRITE32(0); /* headerpadsz */
3440         WRITE32(sess->fore_channel.maxreq_sz);
3441         WRITE32(sess->fore_channel.maxresp_sz);
3442         WRITE32(sess->fore_channel.maxresp_cached);
3443         WRITE32(sess->fore_channel.maxops);
3444         WRITE32(sess->fore_channel.maxreqs);
3445         WRITE32(sess->fore_channel.nr_rdma_attrs);
3446         ADJUST_ARGS();
3447
3448         if (sess->fore_channel.nr_rdma_attrs) {
3449                 RESERVE_SPACE(4);
3450                 WRITE32(sess->fore_channel.rdma_attrs);
3451                 ADJUST_ARGS();
3452         }
3453
3454         RESERVE_SPACE(28);
3455         WRITE32(0); /* headerpadsz */
3456         WRITE32(sess->back_channel.maxreq_sz);
3457         WRITE32(sess->back_channel.maxresp_sz);
3458         WRITE32(sess->back_channel.maxresp_cached);
3459         WRITE32(sess->back_channel.maxops);
3460         WRITE32(sess->back_channel.maxreqs);
3461         WRITE32(sess->back_channel.nr_rdma_attrs);
3462         ADJUST_ARGS();
3463
3464         if (sess->back_channel.nr_rdma_attrs) {
3465                 RESERVE_SPACE(4);
3466                 WRITE32(sess->back_channel.rdma_attrs);
3467                 ADJUST_ARGS();
3468         }
3469         return 0;
3470 }
3471
3472 static __be32
3473 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3474                       struct nfsd4_sequence *seq)
3475 {
3476         __be32 *p;
3477
3478         if (nfserr)
3479                 return nfserr;
3480
3481         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3482         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3483         WRITE32(seq->seqid);
3484         WRITE32(seq->slotid);
3485         /* Note slotid's are numbered from zero: */
3486         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3487         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3488         WRITE32(seq->status_flags);
3489
3490         ADJUST_ARGS();
3491         resp->cstate.datap = p; /* DRC cache data pointer */
3492         return 0;
3493 }
3494
3495 static __be32
3496 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3497                           struct nfsd4_test_stateid *test_stateid)
3498 {
3499         struct nfsd4_test_stateid_id *stateid, *next;
3500         __be32 *p;
3501
3502         if (nfserr)
3503                 return nfserr;
3504
3505         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3506         *p++ = htonl(test_stateid->ts_num_ids);
3507
3508         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3509                 *p++ = stateid->ts_id_status;
3510         }
3511
3512         ADJUST_ARGS();
3513         return nfserr;
3514 }
3515
3516 static __be32
3517 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3518 {
3519         return nfserr;
3520 }
3521
3522 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3523
3524 /*
3525  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3526  * since we don't need to filter out obsolete ops as this is
3527  * done in the decoding phase.
3528  */
3529 static nfsd4_enc nfsd4_enc_ops[] = {
3530         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3531         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3532         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3533         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3534         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3535         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3536         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3537         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3538         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3539         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3540         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3541         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3542         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3543         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3544         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3545         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3546         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3547         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3548         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3549         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3550         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3551         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3552         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3553         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3554         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3555         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3556         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3557         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3558         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3559         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3560         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3561         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3562         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3563         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3564         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3565         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3566         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3567
3568         /* NFSv4.1 operations */
3569         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3570         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3571         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3572         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3573         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3574         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3575         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3576         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3577         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3578         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3579         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3580         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3581         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3582         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3583         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3584         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3585         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3586         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3587         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3588 };
3589
3590 /*
3591  * Calculate the total amount of memory that the compound response has taken
3592  * after encoding the current operation with pad.
3593  *
3594  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3595  *      which was specified at nfsd4_operation, else pad is zero.
3596  *
3597  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3598  *
3599  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3600  * will be at least a page and will therefore hold the xdr_buf head.
3601  */
3602 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3603 {
3604         struct xdr_buf *xb = &resp->rqstp->rq_res;
3605         struct nfsd4_session *session = NULL;
3606         struct nfsd4_slot *slot = resp->cstate.slot;
3607         u32 length, tlen = 0;
3608
3609         if (!nfsd4_has_session(&resp->cstate))
3610                 return 0;
3611
3612         session = resp->cstate.session;
3613
3614         if (xb->page_len == 0) {
3615                 length = (char *)resp->xdr.p - (char *)xb->head[0].iov_base + pad;
3616         } else {
3617                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3618                         tlen = (char *)resp->xdr.p - (char *)xb->tail[0].iov_base;
3619
3620                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3621         }
3622         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3623                 length, xb->page_len, tlen, pad);
3624
3625         if (length > session->se_fchannel.maxresp_sz)
3626                 return nfserr_rep_too_big;
3627
3628         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3629             length > session->se_fchannel.maxresp_cached)
3630                 return nfserr_rep_too_big_to_cache;
3631
3632         return 0;
3633 }
3634
3635 void
3636 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3637 {
3638         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3639         struct svc_rqst *rqstp = resp->rqstp;
3640         __be32 *statp;
3641         nfsd4_enc encoder;
3642         __be32 *p;
3643
3644         RESERVE_SPACE(8);
3645         WRITE32(op->opnum);
3646         statp = p++;    /* to be backfilled at the end */
3647         ADJUST_ARGS();
3648
3649         if (op->opnum == OP_ILLEGAL)
3650                 goto status;
3651         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3652                !nfsd4_enc_ops[op->opnum]);
3653         encoder = nfsd4_enc_ops[op->opnum];
3654         op->status = encoder(resp, op->status, &op->u);
3655         /* nfsd4_check_resp_size guarantees enough room for error status */
3656         if (!op->status) {
3657                 int space_needed = 0;
3658                 if (!nfsd4_last_compound_op(rqstp))
3659                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3660                 op->status = nfsd4_check_resp_size(resp, space_needed);
3661         }
3662         if (op->status == nfserr_resource ||
3663             op->status == nfserr_rep_too_big ||
3664             op->status == nfserr_rep_too_big_to_cache) {
3665                 /*
3666                  * The operation may have already been encoded or
3667                  * partially encoded.  No op returns anything additional
3668                  * in the case of one of these three errors, so we can
3669                  * just truncate back to after the status.  But it's a
3670                  * bug if we had to do this on a non-idempotent op:
3671                  */
3672                 warn_on_nonidempotent_op(op);
3673                 resp->xdr.p = statp + 1;
3674         }
3675         if (so) {
3676                 so->so_replay.rp_status = op->status;
3677                 so->so_replay.rp_buflen = (char *)resp->xdr.p
3678                                                 - (char *)(statp+1);
3679                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3680         }
3681 status:
3682         /*
3683          * Note: We write the status directly, instead of using WRITE32(),
3684          * since it is already in network byte order.
3685          */
3686         *statp = op->status;
3687 }
3688
3689 /*
3690  * Encode the reply stored in the stateowner reply cache
3691  *
3692  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3693  * previously sent already encoded operation.
3694  *
3695  * called with nfs4_lock_state() held
3696  */
3697 void
3698 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3699 {
3700         __be32 *p;
3701         struct nfs4_replay *rp = op->replay;
3702
3703         BUG_ON(!rp);
3704
3705         RESERVE_SPACE(8);
3706         WRITE32(op->opnum);
3707         *p++ = rp->rp_status;  /* already xdr'ed */
3708         ADJUST_ARGS();
3709
3710         RESERVE_SPACE(rp->rp_buflen);
3711         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3712         ADJUST_ARGS();
3713 }
3714
3715 int
3716 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3717 {
3718         return xdr_ressize_check(rqstp, p);
3719 }
3720
3721 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3722 {
3723         struct svc_rqst *rqstp = rq;
3724         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3725
3726         if (args->ops != args->iops) {
3727                 kfree(args->ops);
3728                 args->ops = args->iops;
3729         }
3730         kfree(args->tmpp);
3731         args->tmpp = NULL;
3732         while (args->to_free) {
3733                 struct tmpbuf *tb = args->to_free;
3734                 args->to_free = tb->next;
3735                 tb->release(tb->buf);
3736                 kfree(tb);
3737         }
3738         return 1;
3739 }
3740
3741 int
3742 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3743 {
3744         if (rqstp->rq_arg.head[0].iov_len % 4) {
3745                 /* client is nuts */
3746                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3747                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3748                 return 0;
3749         }
3750         args->p = p;
3751         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3752         args->pagelist = rqstp->rq_arg.pages;
3753         args->pagelen = rqstp->rq_arg.page_len;
3754         args->tmpp = NULL;
3755         args->to_free = NULL;
3756         args->ops = args->iops;
3757         args->rqstp = rqstp;
3758
3759         return !nfsd4_decode_compound(args);
3760 }
3761
3762 int
3763 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3764 {
3765         /*
3766          * All that remains is to write the tag and operation count...
3767          */
3768         struct nfsd4_compound_state *cs = &resp->cstate;
3769         struct kvec *iov;
3770         p = resp->tagp;
3771         *p++ = htonl(resp->taglen);
3772         memcpy(p, resp->tag, resp->taglen);
3773         p += XDR_QUADLEN(resp->taglen);
3774         *p++ = htonl(resp->opcnt);
3775
3776         if (rqstp->rq_res.page_len)
3777                 iov = &rqstp->rq_res.tail[0];
3778         else
3779                 iov = &rqstp->rq_res.head[0];
3780         iov->iov_len = ((char *)resp->xdr.p) - (char *)iov->iov_base;
3781         BUG_ON(iov->iov_len > PAGE_SIZE);
3782         if (nfsd4_has_session(cs)) {
3783                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3784                 struct nfs4_client *clp = cs->session->se_client;
3785                 if (cs->status != nfserr_replay_cache) {
3786                         nfsd4_store_cache_entry(resp);
3787                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3788                 }
3789                 /* Renew the clientid on success and on replay */
3790                 spin_lock(&nn->client_lock);
3791                 nfsd4_put_session(cs->session);
3792                 spin_unlock(&nn->client_lock);
3793                 put_client_renew(clp);
3794         }
3795         return 1;
3796 }
3797
3798 /*
3799  * Local variables:
3800  *  c-basic-offset: 8
3801  * End:
3802  */