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 READTIME(x)       do {                  \
 107         p++;                                    \
 108         (x) = ntohl(*p++);                      \
 109         p++;                                    \
 110 } while (0)
 111 #define READMEM(x,nbytes) do {                  \
 112         x = (char *)p;                          \
 113         p += XDR_QUADLEN(nbytes);               \
 114 } while (0)
 115 #define SAVEMEM(x,nbytes) do {                  \
 116         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 117                 savemem(argp, p, nbytes) :      \
 118                 (char *)p)) {                   \
 119                 dprintk("NFSD: xdr error (%s:%d)\n", \
 120                                 __FILE__, __LINE__); \
 121                 goto xdr_error;                 \
 122                 }                               \
 123         p += XDR_QUADLEN(nbytes);               \
 124 } while (0)
 125 #define COPYMEM(x,nbytes) do {                  \
 126         memcpy((x), p, nbytes);                 \
 127         p += XDR_QUADLEN(nbytes);               \
 128 } while (0)
 129
 130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 131 #define READ_BUF(nbytes)  do {                  \
 132         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 133                 p = argp->p;                    \
 134                 argp->p += XDR_QUADLEN(nbytes); \
 135         } else if (!(p = read_buf(argp, nbytes))) { \
 136                 dprintk("NFSD: xdr error (%s:%d)\n", \
 137                                 __FILE__, __LINE__); \
 138                 goto xdr_error;                 \
 139         }                                       \
 140 } while (0)
 141
 142 static void next_decode_page(struct nfsd4_compoundargs *argp)
 143 {
 144         argp->pagelist++;
 145         argp->p = page_address(argp->pagelist[0]);
 146         if (argp->pagelen < PAGE_SIZE) {
 147                 argp->end = argp->p + (argp->pagelen>>2);
 148                 argp->pagelen = 0;
 149         } else {
 150                 argp->end = argp->p + (PAGE_SIZE>>2);
 151                 argp->pagelen -= PAGE_SIZE;
 152         }
 153 }
 154
 155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 156 {
 157         /* We want more bytes than seem to be available.
 158          * Maybe we need a new page, maybe we have just run out
 159          */
 160         unsigned int avail = (char *)argp->end - (char *)argp->p;
 161         __be32 *p;
 162         if (avail + argp->pagelen < nbytes)
 163                 return NULL;
 164         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 165                 return NULL;
 166         /* ok, we can do it with the current plus the next page */
 167         if (nbytes <= sizeof(argp->tmp))
 168                 p = argp->tmp;
 169         else {
 170                 kfree(argp->tmpp);
 171                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 172                 if (!p)
 173                         return NULL;
 174
 175         }
 176         /*
 177          * The following memcpy is safe because read_buf is always
 178          * called with nbytes > avail, and the two cases above both
 179          * guarantee p points to at least nbytes bytes.
 180          */
 181         memcpy(p, argp->p, avail);
 182         next_decode_page(argp);
 183         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 184         argp->p += XDR_QUADLEN(nbytes - avail);
 185         return p;
 186 }
 187
 188 static int zero_clientid(clientid_t *clid)
 189 {
 190         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 191 }
 192
 193 static int
 194 defer_free(struct nfsd4_compoundargs *argp,
 195                 void (*release)(const void *), void *p)
 196 {
 197         struct tmpbuf *tb;
 198
 199         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 200         if (!tb)
 201                 return -ENOMEM;
 202         tb->buf = p;
 203         tb->release = release;
 204         tb->next = argp->to_free;
 205         argp->to_free = tb;
 206         return 0;
 207 }
 208
 209 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 210 {
 211         if (p == argp->tmp) {
 212                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 213                 if (!p)
 214                         return NULL;
 215         } else {
 216                 BUG_ON(p != argp->tmpp);
 217                 argp->tmpp = NULL;
 218         }
 219         if (defer_free(argp, kfree, p)) {
 220                 kfree(p);
 221                 return NULL;
 222         } else
 223                 return (char *)p;
 224 }
 225
 226 static __be32
 227 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 228 {
 229         u32 bmlen;
 230         DECODE_HEAD;
 231
 232         bmval[0] = 0;
 233         bmval[1] = 0;
 234         bmval[2] = 0;
 235
 236         READ_BUF(4);
 237         READ32(bmlen);
 238         if (bmlen > 1000)
 239                 goto xdr_error;
 240
 241         READ_BUF(bmlen << 2);
 242         if (bmlen > 0)
 243                 READ32(bmval[0]);
 244         if (bmlen > 1)
 245                 READ32(bmval[1]);
 246         if (bmlen > 2)
 247                 READ32(bmval[2]);
 248
 249         DECODE_TAIL;
 250 }
 251
 252 static __be32
 253 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 254                    struct iattr *iattr, struct nfs4_acl **acl,
 255                    struct xdr_netobj *label)
 256 {
 257         int expected_len, len = 0;
 258         u32 dummy32;
 259         char *buf;
 260         int host_err;
 261
 262         DECODE_HEAD;
 263         iattr->ia_valid = 0;
 264         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 265                 return status;
 266
 267         READ_BUF(4);
 268         READ32(expected_len);
 269
 270         if (bmval[0] & FATTR4_WORD0_SIZE) {
 271                 READ_BUF(8);
 272                 len += 8;
 273                 READ64(iattr->ia_size);
 274                 iattr->ia_valid |= ATTR_SIZE;
 275         }
 276         if (bmval[0] & FATTR4_WORD0_ACL) {
 277                 u32 nace;
 278                 struct nfs4_ace *ace;
 279
 280                 READ_BUF(4); len += 4;
 281                 READ32(nace);
 282
 283                 if (nace > NFS4_ACL_MAX)
 284                         return nfserr_resource;
 285
 286                 *acl = nfs4_acl_new(nace);
 287                 if (*acl == NULL) {
 288                         host_err = -ENOMEM;
 289                         goto out_nfserr;
 290                 }
 291                 defer_free(argp, kfree, *acl);
 292
 293                 (*acl)->naces = nace;
 294                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 295                         READ_BUF(16); len += 16;
 296                         READ32(ace->type);
 297                         READ32(ace->flag);
 298                         READ32(ace->access_mask);
 299                         READ32(dummy32);
 300                         READ_BUF(dummy32);
 301                         len += XDR_QUADLEN(dummy32) << 2;
 302                         READMEM(buf, dummy32);
 303                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 304                         status = nfs_ok;
 305                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 306                                 ;
 307                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 308                                 status = nfsd_map_name_to_gid(argp->rqstp,
 309                                                 buf, dummy32, &ace->who_gid);
 310                         else
 311                                 status = nfsd_map_name_to_uid(argp->rqstp,
 312                                                 buf, dummy32, &ace->who_uid);
 313                         if (status)
 314                                 return status;
 315                 }
 316         } else
 317                 *acl = NULL;
 318         if (bmval[1] & FATTR4_WORD1_MODE) {
 319                 READ_BUF(4);
 320                 len += 4;
 321                 READ32(iattr->ia_mode);
 322                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 323                 iattr->ia_valid |= ATTR_MODE;
 324         }
 325         if (bmval[1] & FATTR4_WORD1_OWNER) {
 326                 READ_BUF(4);
 327                 len += 4;
 328                 READ32(dummy32);
 329                 READ_BUF(dummy32);
 330                 len += (XDR_QUADLEN(dummy32) << 2);
 331                 READMEM(buf, dummy32);
 332                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 333                         return status;
 334                 iattr->ia_valid |= ATTR_UID;
 335         }
 336         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 337                 READ_BUF(4);
 338                 len += 4;
 339                 READ32(dummy32);
 340                 READ_BUF(dummy32);
 341                 len += (XDR_QUADLEN(dummy32) << 2);
 342                 READMEM(buf, dummy32);
 343                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 344                         return status;
 345                 iattr->ia_valid |= ATTR_GID;
 346         }
 347         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 348                 READ_BUF(4);
 349                 len += 4;
 350                 READ32(dummy32);
 351                 switch (dummy32) {
 352                 case NFS4_SET_TO_CLIENT_TIME:
 353                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 354                            all 32 bits of 'nseconds'. */
 355                         READ_BUF(12);
 356                         len += 12;
 357                         READ64(iattr->ia_atime.tv_sec);
 358                         READ32(iattr->ia_atime.tv_nsec);
 359                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 360                                 return nfserr_inval;
 361                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 362                         break;
 363                 case NFS4_SET_TO_SERVER_TIME:
 364                         iattr->ia_valid |= ATTR_ATIME;
 365                         break;
 366                 default:
 367                         goto xdr_error;
 368                 }
 369         }
 370         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 371                 READ_BUF(4);
 372                 len += 4;
 373                 READ32(dummy32);
 374                 switch (dummy32) {
 375                 case NFS4_SET_TO_CLIENT_TIME:
 376                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 377                            all 32 bits of 'nseconds'. */
 378                         READ_BUF(12);
 379                         len += 12;
 380                         READ64(iattr->ia_mtime.tv_sec);
 381                         READ32(iattr->ia_mtime.tv_nsec);
 382                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 383                                 return nfserr_inval;
 384                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 385                         break;
 386                 case NFS4_SET_TO_SERVER_TIME:
 387                         iattr->ia_valid |= ATTR_MTIME;
 388                         break;
 389                 default:
 390                         goto xdr_error;
 391                 }
 392         }
 393
 394         label->len = 0;
 395 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 396         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 397                 READ_BUF(4);
 398                 len += 4;
 399                 READ32(dummy32); /* lfs: we don't use it */
 400                 READ_BUF(4);
 401                 len += 4;
 402                 READ32(dummy32); /* pi: we don't use it either */
 403                 READ_BUF(4);
 404                 len += 4;
 405                 READ32(dummy32);
 406                 READ_BUF(dummy32);
 407                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 408                         return nfserr_badlabel;
 409                 len += (XDR_QUADLEN(dummy32) << 2);
 410                 READMEM(buf, dummy32);
 411                 label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
 412                 if (!label->data)
 413                         return nfserr_jukebox;
 414                 defer_free(argp, kfree, label->data);
 415                 memcpy(label->data, buf, dummy32);
 416         }
 417 #endif
 418
 419         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 420             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 421             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 422                 READ_BUF(expected_len - len);
 423         else if (len != expected_len)
 424                 goto xdr_error;
 425
 426         DECODE_TAIL;
 427
 428 out_nfserr:
 429         status = nfserrno(host_err);
 430         goto out;
 431 }
 432
 433 static __be32
 434 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 435 {
 436         DECODE_HEAD;
 437
 438         READ_BUF(sizeof(stateid_t));
 439         READ32(sid->si_generation);
 440         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 441
 442         DECODE_TAIL;
 443 }
 444
 445 static __be32
 446 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 447 {
 448         DECODE_HEAD;
 449
 450         READ_BUF(4);
 451         READ32(access->ac_req_access);
 452
 453         DECODE_TAIL;
 454 }
 455
 456 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 457 {
 458         DECODE_HEAD;
 459         u32 dummy, uid, gid;
 460         char *machine_name;
 461         int i;
 462         int nr_secflavs;
 463
 464         /* callback_sec_params4 */
 465         READ_BUF(4);
 466         READ32(nr_secflavs);
 467         if (nr_secflavs)
 468                 cbs->flavor = (u32)(-1);
 469         else
 470                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 471                 cbs->flavor = 0;
 472         for (i = 0; i < nr_secflavs; ++i) {
 473                 READ_BUF(4);
 474                 READ32(dummy);
 475                 switch (dummy) {
 476                 case RPC_AUTH_NULL:
 477                         /* Nothing to read */
 478                         if (cbs->flavor == (u32)(-1))
 479                                 cbs->flavor = RPC_AUTH_NULL;
 480                         break;
 481                 case RPC_AUTH_UNIX:
 482                         READ_BUF(8);
 483                         /* stamp */
 484                         READ32(dummy);
 485
 486                         /* machine name */
 487                         READ32(dummy);
 488                         READ_BUF(dummy);
 489                         SAVEMEM(machine_name, dummy);
 490
 491                         /* uid, gid */
 492                         READ_BUF(8);
 493                         READ32(uid);
 494                         READ32(gid);
 495
 496                         /* more gids */
 497                         READ_BUF(4);
 498                         READ32(dummy);
 499                         READ_BUF(dummy * 4);
 500                         if (cbs->flavor == (u32)(-1)) {
 501                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 502                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 503                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 504                                         cbs->uid = kuid;
 505                                         cbs->gid = kgid;
 506                                         cbs->flavor = RPC_AUTH_UNIX;
 507                                 } else {
 508                                         dprintk("RPC_AUTH_UNIX with invalid"
 509                                                 "uid or gid ignoring!\n");
 510                                 }
 511                         }
 512                         break;
 513                 case RPC_AUTH_GSS:
 514                         dprintk("RPC_AUTH_GSS callback secflavor "
 515                                 "not supported!\n");
 516                         READ_BUF(8);
 517                         /* gcbp_service */
 518                         READ32(dummy);
 519                         /* gcbp_handle_from_server */
 520                         READ32(dummy);
 521                         READ_BUF(dummy);
 522                         p += XDR_QUADLEN(dummy);
 523                         /* gcbp_handle_from_client */
 524                         READ_BUF(4);
 525                         READ32(dummy);
 526                         READ_BUF(dummy);
 527                         break;
 528                 default:
 529                         dprintk("Illegal callback secflavor\n");
 530                         return nfserr_inval;
 531                 }
 532         }
 533         DECODE_TAIL;
 534 }
 535
 536 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 537 {
 538         DECODE_HEAD;
 539
 540         READ_BUF(4);
 541         READ32(bc->bc_cb_program);
 542         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 543
 544         DECODE_TAIL;
 545 }
 546
 547 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 548 {
 549         DECODE_HEAD;
 550
 551         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 552         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 553         READ32(bcts->dir);
 554         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 555          * could help us figure out we should be using it. */
 556         DECODE_TAIL;
 557 }
 558
 559 static __be32
 560 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 561 {
 562         DECODE_HEAD;
 563
 564         READ_BUF(4);
 565         READ32(close->cl_seqid);
 566         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 567
 568         DECODE_TAIL;
 569 }
 570
 571
 572 static __be32
 573 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 574 {
 575         DECODE_HEAD;
 576
 577         READ_BUF(12);
 578         READ64(commit->co_offset);
 579         READ32(commit->co_count);
 580
 581         DECODE_TAIL;
 582 }
 583
 584 static __be32
 585 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 586 {
 587         DECODE_HEAD;
 588
 589         READ_BUF(4);
 590         READ32(create->cr_type);
 591         switch (create->cr_type) {
 592         case NF4LNK:
 593                 READ_BUF(4);
 594                 READ32(create->cr_linklen);
 595                 READ_BUF(create->cr_linklen);
 596                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 597                 break;
 598         case NF4BLK:
 599         case NF4CHR:
 600                 READ_BUF(8);
 601                 READ32(create->cr_specdata1);
 602                 READ32(create->cr_specdata2);
 603                 break;
 604         case NF4SOCK:
 605         case NF4FIFO:
 606         case NF4DIR:
 607         default:
 608                 break;
 609         }
 610
 611         READ_BUF(4);
 612         READ32(create->cr_namelen);
 613         READ_BUF(create->cr_namelen);
 614         SAVEMEM(create->cr_name, create->cr_namelen);
 615         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 616                 return status;
 617
 618         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 619                                     &create->cr_acl, &create->cr_label);
 620         if (status)
 621                 goto out;
 622
 623         DECODE_TAIL;
 624 }
 625
 626 static inline __be32
 627 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 628 {
 629         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 630 }
 631
 632 static inline __be32
 633 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 634 {
 635         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 636 }
 637
 638 static __be32
 639 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 640 {
 641         DECODE_HEAD;
 642
 643         READ_BUF(4);
 644         READ32(link->li_namelen);
 645         READ_BUF(link->li_namelen);
 646         SAVEMEM(link->li_name, link->li_namelen);
 647         if ((status = check_filename(link->li_name, link->li_namelen)))
 648                 return status;
 649
 650         DECODE_TAIL;
 651 }
 652
 653 static __be32
 654 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 655 {
 656         DECODE_HEAD;
 657
 658         /*
 659         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 660         */
 661         READ_BUF(28);
 662         READ32(lock->lk_type);
 663         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 664                 goto xdr_error;
 665         READ32(lock->lk_reclaim);
 666         READ64(lock->lk_offset);
 667         READ64(lock->lk_length);
 668         READ32(lock->lk_is_new);
 669
 670         if (lock->lk_is_new) {
 671                 READ_BUF(4);
 672                 READ32(lock->lk_new_open_seqid);
 673                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 674                 if (status)
 675                         return status;
 676                 READ_BUF(8 + sizeof(clientid_t));
 677                 READ32(lock->lk_new_lock_seqid);
 678                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 679                 READ32(lock->lk_new_owner.len);
 680                 READ_BUF(lock->lk_new_owner.len);
 681                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 682         } else {
 683                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 684                 if (status)
 685                         return status;
 686                 READ_BUF(4);
 687                 READ32(lock->lk_old_lock_seqid);
 688         }
 689
 690         DECODE_TAIL;
 691 }
 692
 693 static __be32
 694 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 695 {
 696         DECODE_HEAD;
 697
 698         READ_BUF(32);
 699         READ32(lockt->lt_type);
 700         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 701                 goto xdr_error;
 702         READ64(lockt->lt_offset);
 703         READ64(lockt->lt_length);
 704         COPYMEM(&lockt->lt_clientid, 8);
 705         READ32(lockt->lt_owner.len);
 706         READ_BUF(lockt->lt_owner.len);
 707         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 708
 709         DECODE_TAIL;
 710 }
 711
 712 static __be32
 713 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 714 {
 715         DECODE_HEAD;
 716
 717         READ_BUF(8);
 718         READ32(locku->lu_type);
 719         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 720                 goto xdr_error;
 721         READ32(locku->lu_seqid);
 722         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 723         if (status)
 724                 return status;
 725         READ_BUF(16);
 726         READ64(locku->lu_offset);
 727         READ64(locku->lu_length);
 728
 729         DECODE_TAIL;
 730 }
 731
 732 static __be32
 733 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 734 {
 735         DECODE_HEAD;
 736
 737         READ_BUF(4);
 738         READ32(lookup->lo_len);
 739         READ_BUF(lookup->lo_len);
 740         SAVEMEM(lookup->lo_name, lookup->lo_len);
 741         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 742                 return status;
 743
 744         DECODE_TAIL;
 745 }
 746
 747 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 748 {
 749         __be32 *p;
 750         u32 w;
 751
 752         READ_BUF(4);
 753         READ32(w);
 754         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 755         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 756         if (deleg_when)
 757                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 758
 759         switch (w & NFS4_SHARE_ACCESS_MASK) {
 760         case NFS4_SHARE_ACCESS_READ:
 761         case NFS4_SHARE_ACCESS_WRITE:
 762         case NFS4_SHARE_ACCESS_BOTH:
 763                 break;
 764         default:
 765                 return nfserr_bad_xdr;
 766         }
 767         w &= ~NFS4_SHARE_ACCESS_MASK;
 768         if (!w)
 769                 return nfs_ok;
 770         if (!argp->minorversion)
 771                 return nfserr_bad_xdr;
 772         switch (w & NFS4_SHARE_WANT_MASK) {
 773         case NFS4_SHARE_WANT_NO_PREFERENCE:
 774         case NFS4_SHARE_WANT_READ_DELEG:
 775         case NFS4_SHARE_WANT_WRITE_DELEG:
 776         case NFS4_SHARE_WANT_ANY_DELEG:
 777         case NFS4_SHARE_WANT_NO_DELEG:
 778         case NFS4_SHARE_WANT_CANCEL:
 779                 break;
 780         default:
 781                 return nfserr_bad_xdr;
 782         }
 783         w &= ~NFS4_SHARE_WANT_MASK;
 784         if (!w)
 785                 return nfs_ok;
 786
 787         if (!deleg_when)        /* open_downgrade */
 788                 return nfserr_inval;
 789         switch (w) {
 790         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 791         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 792         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 793               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 794                 return nfs_ok;
 795         }
 796 xdr_error:
 797         return nfserr_bad_xdr;
 798 }
 799
 800 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 801 {
 802         __be32 *p;
 803
 804         READ_BUF(4);
 805         READ32(*x);
 806         /* Note: unlinke access bits, deny bits may be zero. */
 807         if (*x & ~NFS4_SHARE_DENY_BOTH)
 808                 return nfserr_bad_xdr;
 809         return nfs_ok;
 810 xdr_error:
 811         return nfserr_bad_xdr;
 812 }
 813
 814 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 815 {
 816         __be32 *p;
 817
 818         READ_BUF(4);
 819         READ32(o->len);
 820
 821         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 822                 return nfserr_bad_xdr;
 823
 824         READ_BUF(o->len);
 825         SAVEMEM(o->data, o->len);
 826         return nfs_ok;
 827 xdr_error:
 828         return nfserr_bad_xdr;
 829 }
 830
 831 static __be32
 832 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 833 {
 834         DECODE_HEAD;
 835         u32 dummy;
 836
 837         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 838         open->op_iattr.ia_valid = 0;
 839         open->op_openowner = NULL;
 840
 841         open->op_xdr_error = 0;
 842         /* seqid, share_access, share_deny, clientid, ownerlen */
 843         READ_BUF(4);
 844         READ32(open->op_seqid);
 845         /* decode, yet ignore deleg_when until supported */
 846         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 847                                            &open->op_deleg_want, &dummy);
 848         if (status)
 849                 goto xdr_error;
 850         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 851         if (status)
 852                 goto xdr_error;
 853         READ_BUF(sizeof(clientid_t));
 854         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 855         status = nfsd4_decode_opaque(argp, &open->op_owner);
 856         if (status)
 857                 goto xdr_error;
 858         READ_BUF(4);
 859         READ32(open->op_create);
 860         switch (open->op_create) {
 861         case NFS4_OPEN_NOCREATE:
 862                 break;
 863         case NFS4_OPEN_CREATE:
 864                 READ_BUF(4);
 865                 READ32(open->op_createmode);
 866                 switch (open->op_createmode) {
 867                 case NFS4_CREATE_UNCHECKED:
 868                 case NFS4_CREATE_GUARDED:
 869                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 870                                 &open->op_iattr, &open->op_acl, &open->op_label);
 871                         if (status)
 872                                 goto out;
 873                         break;
 874                 case NFS4_CREATE_EXCLUSIVE:
 875                         READ_BUF(NFS4_VERIFIER_SIZE);
 876                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 877                         break;
 878                 case NFS4_CREATE_EXCLUSIVE4_1:
 879                         if (argp->minorversion < 1)
 880                                 goto xdr_error;
 881                         READ_BUF(NFS4_VERIFIER_SIZE);
 882                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 883                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 884                                 &open->op_iattr, &open->op_acl, &open->op_label);
 885                         if (status)
 886                                 goto out;
 887                         break;
 888                 default:
 889                         goto xdr_error;
 890                 }
 891                 break;
 892         default:
 893                 goto xdr_error;
 894         }
 895
 896         /* open_claim */
 897         READ_BUF(4);
 898         READ32(open->op_claim_type);
 899         switch (open->op_claim_type) {
 900         case NFS4_OPEN_CLAIM_NULL:
 901         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 902                 READ_BUF(4);
 903                 READ32(open->op_fname.len);
 904                 READ_BUF(open->op_fname.len);
 905                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 906                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 907                         return status;
 908                 break;
 909         case NFS4_OPEN_CLAIM_PREVIOUS:
 910                 READ_BUF(4);
 911                 READ32(open->op_delegate_type);
 912                 break;
 913         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 914                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 915                 if (status)
 916                         return status;
 917                 READ_BUF(4);
 918                 READ32(open->op_fname.len);
 919                 READ_BUF(open->op_fname.len);
 920                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 921                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 922                         return status;
 923                 break;
 924         case NFS4_OPEN_CLAIM_FH:
 925         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 926                 if (argp->minorversion < 1)
 927                         goto xdr_error;
 928                 /* void */
 929                 break;
 930         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 931                 if (argp->minorversion < 1)
 932                         goto xdr_error;
 933                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 934                 if (status)
 935                         return status;
 936                 break;
 937         default:
 938                 goto xdr_error;
 939         }
 940
 941         DECODE_TAIL;
 942 }
 943
 944 static __be32
 945 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 946 {
 947         DECODE_HEAD;
 948
 949         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 950         if (status)
 951                 return status;
 952         READ_BUF(4);
 953         READ32(open_conf->oc_seqid);
 954
 955         DECODE_TAIL;
 956 }
 957
 958 static __be32
 959 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 960 {
 961         DECODE_HEAD;
 962
 963         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 964         if (status)
 965                 return status;
 966         READ_BUF(4);
 967         READ32(open_down->od_seqid);
 968         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 969                                            &open_down->od_deleg_want, NULL);
 970         if (status)
 971                 return status;
 972         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 973         if (status)
 974                 return status;
 975         DECODE_TAIL;
 976 }
 977
 978 static __be32
 979 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 980 {
 981         DECODE_HEAD;
 982
 983         READ_BUF(4);
 984         READ32(putfh->pf_fhlen);
 985         if (putfh->pf_fhlen > NFS4_FHSIZE)
 986                 goto xdr_error;
 987         READ_BUF(putfh->pf_fhlen);
 988         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 989
 990         DECODE_TAIL;
 991 }
 992
 993 static __be32
 994 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 995 {
 996         DECODE_HEAD;
 997
 998         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 999         if (status)
1000                 return status;
1001         READ_BUF(12);
1002         READ64(read->rd_offset);
1003         READ32(read->rd_length);
1004
1005         DECODE_TAIL;
1006 }
1007
1008 static __be32
1009 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1010 {
1011         DECODE_HEAD;
1012
1013         READ_BUF(24);
1014         READ64(readdir->rd_cookie);
1015         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1016         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
1017         READ32(readdir->rd_maxcount);
1018         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1019                 goto out;
1020
1021         DECODE_TAIL;
1022 }
1023
1024 static __be32
1025 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1026 {
1027         DECODE_HEAD;
1028
1029         READ_BUF(4);
1030         READ32(remove->rm_namelen);
1031         READ_BUF(remove->rm_namelen);
1032         SAVEMEM(remove->rm_name, remove->rm_namelen);
1033         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1034                 return status;
1035
1036         DECODE_TAIL;
1037 }
1038
1039 static __be32
1040 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1041 {
1042         DECODE_HEAD;
1043
1044         READ_BUF(4);
1045         READ32(rename->rn_snamelen);
1046         READ_BUF(rename->rn_snamelen + 4);
1047         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1048         READ32(rename->rn_tnamelen);
1049         READ_BUF(rename->rn_tnamelen);
1050         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1051         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1052                 return status;
1053         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1054                 return status;
1055
1056         DECODE_TAIL;
1057 }
1058
1059 static __be32
1060 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1061 {
1062         DECODE_HEAD;
1063
1064         READ_BUF(sizeof(clientid_t));
1065         COPYMEM(clientid, sizeof(clientid_t));
1066
1067         DECODE_TAIL;
1068 }
1069
1070 static __be32
1071 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1072                      struct nfsd4_secinfo *secinfo)
1073 {
1074         DECODE_HEAD;
1075
1076         READ_BUF(4);
1077         READ32(secinfo->si_namelen);
1078         READ_BUF(secinfo->si_namelen);
1079         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1080         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1081         if (status)
1082                 return status;
1083         DECODE_TAIL;
1084 }
1085
1086 static __be32
1087 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1088                      struct nfsd4_secinfo_no_name *sin)
1089 {
1090         DECODE_HEAD;
1091
1092         READ_BUF(4);
1093         READ32(sin->sin_style);
1094         DECODE_TAIL;
1095 }
1096
1097 static __be32
1098 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1099 {
1100         __be32 status;
1101
1102         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1103         if (status)
1104                 return status;
1105         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1106                                   &setattr->sa_acl, &setattr->sa_label);
1107 }
1108
1109 static __be32
1110 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1111 {
1112         DECODE_HEAD;
1113
1114         READ_BUF(NFS4_VERIFIER_SIZE);
1115         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1116
1117         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1118         if (status)
1119                 return nfserr_bad_xdr;
1120         READ_BUF(8);
1121         READ32(setclientid->se_callback_prog);
1122         READ32(setclientid->se_callback_netid_len);
1123
1124         READ_BUF(setclientid->se_callback_netid_len + 4);
1125         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1126         READ32(setclientid->se_callback_addr_len);
1127
1128         READ_BUF(setclientid->se_callback_addr_len + 4);
1129         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1130         READ32(setclientid->se_callback_ident);
1131
1132         DECODE_TAIL;
1133 }
1134
1135 static __be32
1136 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1137 {
1138         DECODE_HEAD;
1139
1140         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1141         COPYMEM(&scd_c->sc_clientid, 8);
1142         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1143
1144         DECODE_TAIL;
1145 }
1146
1147 /* Also used for NVERIFY */
1148 static __be32
1149 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1150 {
1151         DECODE_HEAD;
1152
1153         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1154                 goto out;
1155
1156         /* For convenience's sake, we compare raw xdr'd attributes in
1157          * nfsd4_proc_verify */
1158
1159         READ_BUF(4);
1160         READ32(verify->ve_attrlen);
1161         READ_BUF(verify->ve_attrlen);
1162         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1163
1164         DECODE_TAIL;
1165 }
1166
1167 static __be32
1168 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1169 {
1170         int avail;
1171         int len;
1172         DECODE_HEAD;
1173
1174         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1175         if (status)
1176                 return status;
1177         READ_BUF(16);
1178         READ64(write->wr_offset);
1179         READ32(write->wr_stable_how);
1180         if (write->wr_stable_how > 2)
1181                 goto xdr_error;
1182         READ32(write->wr_buflen);
1183
1184         /* Sorry .. no magic macros for this.. *
1185          * READ_BUF(write->wr_buflen);
1186          * SAVEMEM(write->wr_buf, write->wr_buflen);
1187          */
1188         avail = (char*)argp->end - (char*)argp->p;
1189         if (avail + argp->pagelen < write->wr_buflen) {
1190                 dprintk("NFSD: xdr error (%s:%d)\n",
1191                                 __FILE__, __LINE__);
1192                 goto xdr_error;
1193         }
1194         write->wr_head.iov_base = p;
1195         write->wr_head.iov_len = avail;
1196         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1197         write->wr_pagelist = argp->pagelist;
1198
1199         len = XDR_QUADLEN(write->wr_buflen) << 2;
1200         if (len >= avail) {
1201                 int pages;
1202
1203                 len -= avail;
1204
1205                 pages = len >> PAGE_SHIFT;
1206                 argp->pagelist += pages;
1207                 argp->pagelen -= pages * PAGE_SIZE;
1208                 len -= pages * PAGE_SIZE;
1209
1210                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1211                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1212         }
1213         argp->p += XDR_QUADLEN(len);
1214
1215         DECODE_TAIL;
1216 }
1217
1218 static __be32
1219 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1220 {
1221         DECODE_HEAD;
1222
1223         READ_BUF(12);
1224         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1225         READ32(rlockowner->rl_owner.len);
1226         READ_BUF(rlockowner->rl_owner.len);
1227         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1228
1229         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1230                 return nfserr_inval;
1231         DECODE_TAIL;
1232 }
1233
1234 static __be32
1235 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1236                          struct nfsd4_exchange_id *exid)
1237 {
1238         int dummy, tmp;
1239         DECODE_HEAD;
1240
1241         READ_BUF(NFS4_VERIFIER_SIZE);
1242         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1243
1244         status = nfsd4_decode_opaque(argp, &exid->clname);
1245         if (status)
1246                 return nfserr_bad_xdr;
1247
1248         READ_BUF(4);
1249         READ32(exid->flags);
1250
1251         /* Ignore state_protect4_a */
1252         READ_BUF(4);
1253         READ32(exid->spa_how);
1254         switch (exid->spa_how) {
1255         case SP4_NONE:
1256                 break;
1257         case SP4_MACH_CRED:
1258                 /* spo_must_enforce */
1259                 READ_BUF(4);
1260                 READ32(dummy);
1261                 READ_BUF(dummy * 4);
1262                 p += dummy;
1263
1264                 /* spo_must_allow */
1265                 READ_BUF(4);
1266                 READ32(dummy);
1267                 READ_BUF(dummy * 4);
1268                 p += dummy;
1269                 break;
1270         case SP4_SSV:
1271                 /* ssp_ops */
1272                 READ_BUF(4);
1273                 READ32(dummy);
1274                 READ_BUF(dummy * 4);
1275                 p += dummy;
1276
1277                 READ_BUF(4);
1278                 READ32(dummy);
1279                 READ_BUF(dummy * 4);
1280                 p += dummy;
1281
1282                 /* ssp_hash_algs<> */
1283                 READ_BUF(4);
1284                 READ32(tmp);
1285                 while (tmp--) {
1286                         READ_BUF(4);
1287                         READ32(dummy);
1288                         READ_BUF(dummy);
1289                         p += XDR_QUADLEN(dummy);
1290                 }
1291
1292                 /* ssp_encr_algs<> */
1293                 READ_BUF(4);
1294                 READ32(tmp);
1295                 while (tmp--) {
1296                         READ_BUF(4);
1297                         READ32(dummy);
1298                         READ_BUF(dummy);
1299                         p += XDR_QUADLEN(dummy);
1300                 }
1301
1302                 /* ssp_window and ssp_num_gss_handles */
1303                 READ_BUF(8);
1304                 READ32(dummy);
1305                 READ32(dummy);
1306                 break;
1307         default:
1308                 goto xdr_error;
1309         }
1310
1311         /* Ignore Implementation ID */
1312         READ_BUF(4);    /* nfs_impl_id4 array length */
1313         READ32(dummy);
1314
1315         if (dummy > 1)
1316                 goto xdr_error;
1317
1318         if (dummy == 1) {
1319                 /* nii_domain */
1320                 READ_BUF(4);
1321                 READ32(dummy);
1322                 READ_BUF(dummy);
1323                 p += XDR_QUADLEN(dummy);
1324
1325                 /* nii_name */
1326                 READ_BUF(4);
1327                 READ32(dummy);
1328                 READ_BUF(dummy);
1329                 p += XDR_QUADLEN(dummy);
1330
1331                 /* nii_date */
1332                 READ_BUF(12);
1333                 p += 3;
1334         }
1335         DECODE_TAIL;
1336 }
1337
1338 static __be32
1339 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1340                             struct nfsd4_create_session *sess)
1341 {
1342         DECODE_HEAD;
1343         u32 dummy;
1344
1345         READ_BUF(16);
1346         COPYMEM(&sess->clientid, 8);
1347         READ32(sess->seqid);
1348         READ32(sess->flags);
1349
1350         /* Fore channel attrs */
1351         READ_BUF(28);
1352         READ32(dummy); /* headerpadsz is always 0 */
1353         READ32(sess->fore_channel.maxreq_sz);
1354         READ32(sess->fore_channel.maxresp_sz);
1355         READ32(sess->fore_channel.maxresp_cached);
1356         READ32(sess->fore_channel.maxops);
1357         READ32(sess->fore_channel.maxreqs);
1358         READ32(sess->fore_channel.nr_rdma_attrs);
1359         if (sess->fore_channel.nr_rdma_attrs == 1) {
1360                 READ_BUF(4);
1361                 READ32(sess->fore_channel.rdma_attrs);
1362         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1363                 dprintk("Too many fore channel attr bitmaps!\n");
1364                 goto xdr_error;
1365         }
1366
1367         /* Back channel attrs */
1368         READ_BUF(28);
1369         READ32(dummy); /* headerpadsz is always 0 */
1370         READ32(sess->back_channel.maxreq_sz);
1371         READ32(sess->back_channel.maxresp_sz);
1372         READ32(sess->back_channel.maxresp_cached);
1373         READ32(sess->back_channel.maxops);
1374         READ32(sess->back_channel.maxreqs);
1375         READ32(sess->back_channel.nr_rdma_attrs);
1376         if (sess->back_channel.nr_rdma_attrs == 1) {
1377                 READ_BUF(4);
1378                 READ32(sess->back_channel.rdma_attrs);
1379         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1380                 dprintk("Too many back channel attr bitmaps!\n");
1381                 goto xdr_error;
1382         }
1383
1384         READ_BUF(4);
1385         READ32(sess->callback_prog);
1386         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1387         DECODE_TAIL;
1388 }
1389
1390 static __be32
1391 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1392                              struct nfsd4_destroy_session *destroy_session)
1393 {
1394         DECODE_HEAD;
1395         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1396         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1397
1398         DECODE_TAIL;
1399 }
1400
1401 static __be32
1402 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1403                           struct nfsd4_free_stateid *free_stateid)
1404 {
1405         DECODE_HEAD;
1406
1407         READ_BUF(sizeof(stateid_t));
1408         READ32(free_stateid->fr_stateid.si_generation);
1409         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1410
1411         DECODE_TAIL;
1412 }
1413
1414 static __be32
1415 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1416                       struct nfsd4_sequence *seq)
1417 {
1418         DECODE_HEAD;
1419
1420         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1421         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1422         READ32(seq->seqid);
1423         READ32(seq->slotid);
1424         READ32(seq->maxslots);
1425         READ32(seq->cachethis);
1426
1427         DECODE_TAIL;
1428 }
1429
1430 static __be32
1431 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1432 {
1433         int i;
1434         __be32 *p, status;
1435         struct nfsd4_test_stateid_id *stateid;
1436
1437         READ_BUF(4);
1438         test_stateid->ts_num_ids = ntohl(*p++);
1439
1440         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1441
1442         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1443                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1444                 if (!stateid) {
1445                         status = nfserrno(-ENOMEM);
1446                         goto out;
1447                 }
1448
1449                 defer_free(argp, kfree, stateid);
1450                 INIT_LIST_HEAD(&stateid->ts_id_list);
1451                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1452
1453                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1454                 if (status)
1455                         goto out;
1456         }
1457
1458         status = 0;
1459 out:
1460         return status;
1461 xdr_error:
1462         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1463         status = nfserr_bad_xdr;
1464         goto out;
1465 }
1466
1467 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1468 {
1469         DECODE_HEAD;
1470
1471         READ_BUF(8);
1472         COPYMEM(&dc->clientid, 8);
1473
1474         DECODE_TAIL;
1475 }
1476
1477 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1478 {
1479         DECODE_HEAD;
1480
1481         READ_BUF(4);
1482         READ32(rc->rca_one_fs);
1483
1484         DECODE_TAIL;
1485 }
1486
1487 static __be32
1488 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1489 {
1490         return nfs_ok;
1491 }
1492
1493 static __be32
1494 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1495 {
1496         return nfserr_notsupp;
1497 }
1498
1499 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1500
1501 static nfsd4_dec nfsd4_dec_ops[] = {
1502         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1503         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1504         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1505         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1506         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1507         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1508         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1509         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1510         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1511         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1512         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1513         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1514         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1515         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1516         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1517         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1518         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1519         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1520         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1521         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1522         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1523         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1524         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1525         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1526         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1527         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1528         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1529         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1530         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1531         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1532         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1533         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1534         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1535         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1536         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1537         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1538         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1539 };
1540
1541 static nfsd4_dec nfsd41_dec_ops[] = {
1542         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1543         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1544         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1545         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1546         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1547         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1548         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1549         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1550         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1551         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1552         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1553         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1554         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1555         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1556         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1557         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1558         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1559         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1560         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1561         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1562         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1563         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1564         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1565         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1566         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1567         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1568         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1569         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1570         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1571         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1572         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1573         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1574         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1575         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1576         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1577         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1578         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1579
1580         /* new operations for NFSv4.1 */
1581         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1582         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1583         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1584         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1585         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1586         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1587         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1588         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1589         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1590         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1591         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1592         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1593         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1594         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1595         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1596         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1597         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1598         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1599         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1600 };
1601
1602 struct nfsd4_minorversion_ops {
1603         nfsd4_dec *decoders;
1604         int nops;
1605 };
1606
1607 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1608         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1609         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1610         [2] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1611 };
1612
1613 static __be32
1614 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1615 {
1616         DECODE_HEAD;
1617         struct nfsd4_op *op;
1618         struct nfsd4_minorversion_ops *ops;
1619         bool cachethis = false;
1620         int i;
1621
1622         READ_BUF(4);
1623         READ32(argp->taglen);
1624         READ_BUF(argp->taglen + 8);
1625         SAVEMEM(argp->tag, argp->taglen);
1626         READ32(argp->minorversion);
1627         READ32(argp->opcnt);
1628
1629         if (argp->taglen > NFSD4_MAX_TAGLEN)
1630                 goto xdr_error;
1631         if (argp->opcnt > 100)
1632                 goto xdr_error;
1633
1634         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1635                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1636                 if (!argp->ops) {
1637                         argp->ops = argp->iops;
1638                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1639                         goto xdr_error;
1640                 }
1641         }
1642
1643         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1644                 argp->opcnt = 0;
1645
1646         ops = &nfsd4_minorversion[argp->minorversion];
1647         for (i = 0; i < argp->opcnt; i++) {
1648                 op = &argp->ops[i];
1649                 op->replay = NULL;
1650
1651                 READ_BUF(4);
1652                 READ32(op->opnum);
1653
1654                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1655                         op->status = ops->decoders[op->opnum](argp, &op->u);
1656                 else {
1657                         op->opnum = OP_ILLEGAL;
1658                         op->status = nfserr_op_illegal;
1659                 }
1660
1661                 if (op->status) {
1662                         argp->opcnt = i+1;
1663                         break;
1664                 }
1665                 /*
1666                  * We'll try to cache the result in the DRC if any one
1667                  * op in the compound wants to be cached:
1668                  */
1669                 cachethis |= nfsd4_cache_this_op(op);
1670         }
1671         /* Sessions make the DRC unnecessary: */
1672         if (argp->minorversion)
1673                 cachethis = false;
1674         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1675
1676         DECODE_TAIL;
1677 }
1678
1679 #define WRITE32(n)               *p++ = htonl(n)
1680 #define WRITE64(n)               do {                           \
1681         *p++ = htonl((u32)((n) >> 32));                         \
1682         *p++ = htonl((u32)(n));                                 \
1683 } while (0)
1684 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1685         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1686         memcpy(p, ptr, nbytes);                                 \
1687         p += XDR_QUADLEN(nbytes);                               \
1688 }} while (0)
1689
1690 static void write32(__be32 **p, u32 n)
1691 {
1692         *(*p)++ = htonl(n);
1693 }
1694
1695 static void write64(__be32 **p, u64 n)
1696 {
1697         write32(p, (n >> 32));
1698         write32(p, (u32)n);
1699 }
1700
1701 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1702 {
1703         if (IS_I_VERSION(inode)) {
1704                 write64(p, inode->i_version);
1705         } else {
1706                 write32(p, stat->ctime.tv_sec);
1707                 write32(p, stat->ctime.tv_nsec);
1708         }
1709 }
1710
1711 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1712 {
1713         write32(p, c->atomic);
1714         if (c->change_supported) {
1715                 write64(p, c->before_change);
1716                 write64(p, c->after_change);
1717         } else {
1718                 write32(p, c->before_ctime_sec);
1719                 write32(p, c->before_ctime_nsec);
1720                 write32(p, c->after_ctime_sec);
1721                 write32(p, c->after_ctime_nsec);
1722         }
1723 }
1724
1725 #define RESERVE_SPACE(nbytes)   do {                            \
1726         p = resp->p;                                            \
1727         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1728 } while (0)
1729 #define ADJUST_ARGS()           resp->p = p
1730
1731 /* Encode as an array of strings the string given with components
1732  * separated @sep, escaped with esc_enter and esc_exit.
1733  */
1734 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1735                                    __be32 **pp, int *buflen,
1736                                    char esc_enter, char esc_exit)
1737 {
1738         __be32 *p = *pp;
1739         __be32 *countp = p;
1740         int strlen, count=0;
1741         char *str, *end, *next;
1742
1743         dprintk("nfsd4_encode_components(%s)\n", components);
1744         if ((*buflen -= 4) < 0)
1745                 return nfserr_resource;
1746         WRITE32(0); /* We will fill this in with @count later */
1747         end = str = components;
1748         while (*end) {
1749                 bool found_esc = false;
1750
1751                 /* try to parse as esc_start, ..., esc_end, sep */
1752                 if (*str == esc_enter) {
1753                         for (; *end && (*end != esc_exit); end++)
1754                                 /* find esc_exit or end of string */;
1755                         next = end + 1;
1756                         if (*end && (!*next || *next == sep)) {
1757                                 str++;
1758                                 found_esc = true;
1759                         }
1760                 }
1761
1762                 if (!found_esc)
1763                         for (; *end && (*end != sep); end++)
1764                                 /* find sep or end of string */;
1765
1766                 strlen = end - str;
1767                 if (strlen) {
1768                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1769                                 return nfserr_resource;
1770                         WRITE32(strlen);
1771                         WRITEMEM(str, strlen);
1772                         count++;
1773                 }
1774                 else
1775                         end++;
1776                 str = end;
1777         }
1778         *pp = p;
1779         p = countp;
1780         WRITE32(count);
1781         return 0;
1782 }
1783
1784 /* Encode as an array of strings the string given with components
1785  * separated @sep.
1786  */
1787 static __be32 nfsd4_encode_components(char sep, char *components,
1788                                    __be32 **pp, int *buflen)
1789 {
1790         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1791 }
1792
1793 /*
1794  * encode a location element of a fs_locations structure
1795  */
1796 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1797                                     __be32 **pp, int *buflen)
1798 {
1799         __be32 status;
1800         __be32 *p = *pp;
1801
1802         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1803                                                 '[', ']');
1804         if (status)
1805                 return status;
1806         status = nfsd4_encode_components('/', location->path, &p, buflen);
1807         if (status)
1808                 return status;
1809         *pp = p;
1810         return 0;
1811 }
1812
1813 /*
1814  * Encode a path in RFC3530 'pathname4' format
1815  */
1816 static __be32 nfsd4_encode_path(const struct path *root,
1817                 const struct path *path, __be32 **pp, int *buflen)
1818 {
1819         struct path cur = *path;
1820         __be32 *p = *pp;
1821         struct dentry **components = NULL;
1822         unsigned int ncomponents = 0;
1823         __be32 err = nfserr_jukebox;
1824
1825         dprintk("nfsd4_encode_components(");
1826
1827         path_get(&cur);
1828         /* First walk the path up to the nfsd root, and store the
1829          * dentries/path components in an array.
1830          */
1831         for (;;) {
1832                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1833                         break;
1834                 if (cur.dentry == cur.mnt->mnt_root) {
1835                         if (follow_up(&cur))
1836                                 continue;
1837                         goto out_free;
1838                 }
1839                 if ((ncomponents & 15) == 0) {
1840                         struct dentry **new;
1841                         new = krealloc(components,
1842                                         sizeof(*new) * (ncomponents + 16),
1843                                         GFP_KERNEL);
1844                         if (!new)
1845                                 goto out_free;
1846                         components = new;
1847                 }
1848                 components[ncomponents++] = cur.dentry;
1849                 cur.dentry = dget_parent(cur.dentry);
1850         }
1851
1852         *buflen -= 4;
1853         if (*buflen < 0)
1854                 goto out_free;
1855         WRITE32(ncomponents);
1856
1857         while (ncomponents) {
1858                 struct dentry *dentry = components[ncomponents - 1];
1859                 unsigned int len;
1860
1861                 spin_lock(&dentry->d_lock);
1862                 len = dentry->d_name.len;
1863                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1864                 if (*buflen < 0) {
1865                         spin_unlock(&dentry->d_lock);
1866                         goto out_free;
1867                 }
1868                 WRITE32(len);
1869                 WRITEMEM(dentry->d_name.name, len);
1870                 dprintk("/%s", dentry->d_name.name);
1871                 spin_unlock(&dentry->d_lock);
1872                 dput(dentry);
1873                 ncomponents--;
1874         }
1875
1876         *pp = p;
1877         err = 0;
1878 out_free:
1879         dprintk(")\n");
1880         while (ncomponents)
1881                 dput(components[--ncomponents]);
1882         kfree(components);
1883         path_put(&cur);
1884         return err;
1885 }
1886
1887 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1888                 const struct path *path, __be32 **pp, int *buflen)
1889 {
1890         struct svc_export *exp_ps;
1891         __be32 res;
1892
1893         exp_ps = rqst_find_fsidzero_export(rqstp);
1894         if (IS_ERR(exp_ps))
1895                 return nfserrno(PTR_ERR(exp_ps));
1896         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1897         exp_put(exp_ps);
1898         return res;
1899 }
1900
1901 /*
1902  *  encode a fs_locations structure
1903  */
1904 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1905                                      struct svc_export *exp,
1906                                      __be32 **pp, int *buflen)
1907 {
1908         __be32 status;
1909         int i;
1910         __be32 *p = *pp;
1911         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1912
1913         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1914         if (status)
1915                 return status;
1916         if ((*buflen -= 4) < 0)
1917                 return nfserr_resource;
1918         WRITE32(fslocs->locations_count);
1919         for (i=0; i<fslocs->locations_count; i++) {
1920                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1921                                                    &p, buflen);
1922                 if (status)
1923                         return status;
1924         }
1925         *pp = p;
1926         return 0;
1927 }
1928
1929 static u32 nfs4_file_type(umode_t mode)
1930 {
1931         switch (mode & S_IFMT) {
1932         case S_IFIFO:   return NF4FIFO;
1933         case S_IFCHR:   return NF4CHR;
1934         case S_IFDIR:   return NF4DIR;
1935         case S_IFBLK:   return NF4BLK;
1936         case S_IFLNK:   return NF4LNK;
1937         case S_IFREG:   return NF4REG;
1938         case S_IFSOCK:  return NF4SOCK;
1939         default:        return NF4BAD;
1940         };
1941 }
1942
1943 static __be32
1944 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1945                         __be32 **p, int *buflen)
1946 {
1947         int status;
1948
1949         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1950                 return nfserr_resource;
1951         if (whotype != NFS4_ACL_WHO_NAMED)
1952                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1953         else if (gid_valid(gid))
1954                 status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1955         else
1956                 status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1957         if (status < 0)
1958                 return nfserrno(status);
1959         *p = xdr_encode_opaque(*p, NULL, status);
1960         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1961         BUG_ON(*buflen < 0);
1962         return 0;
1963 }
1964
1965 static inline __be32
1966 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1967 {
1968         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1969                                  p, buflen);
1970 }
1971
1972 static inline __be32
1973 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1974 {
1975         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
1976                                  p, buflen);
1977 }
1978
1979 static inline __be32
1980 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1981                 __be32 **p, int *buflen)
1982 {
1983         kuid_t uid = INVALID_UID;
1984         kgid_t gid = INVALID_GID;
1985
1986         if (ace->whotype == NFS4_ACL_WHO_NAMED) {
1987                 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1988                         gid = ace->who_gid;
1989                 else
1990                         uid = ace->who_uid;
1991         }
1992         return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
1993 }
1994
1995 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1996                               FATTR4_WORD0_RDATTR_ERROR)
1997 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1998
1999 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2000 static inline __be32
2001 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2002 {
2003         __be32 *p = *pp;
2004
2005         if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4))
2006                 return nfserr_resource;
2007
2008         /*
2009          * For now we use a 0 here to indicate the null translation; in
2010          * the future we may place a call to translation code here.
2011          */
2012         if ((*buflen -= 8) < 0)
2013                 return nfserr_resource;
2014
2015         WRITE32(0); /* lfs */
2016         WRITE32(0); /* pi */
2017         p = xdr_encode_opaque(p, context, len);
2018         *buflen -= (XDR_QUADLEN(len) << 2) + 4;
2019
2020         *pp = p;
2021         return 0;
2022 }
2023 #else
2024 static inline __be32
2025 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2026 { return 0; }
2027 #endif
2028
2029 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2030 {
2031         /* As per referral draft:  */
2032         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2033             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2034                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2035                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2036                         *rdattr_err = NFSERR_MOVED;
2037                 else
2038                         return nfserr_moved;
2039         }
2040         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2041         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2042         return 0;
2043 }
2044
2045
2046 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2047 {
2048         struct path path = exp->ex_path;
2049         int err;
2050
2051         path_get(&path);
2052         while (follow_up(&path)) {
2053                 if (path.dentry != path.mnt->mnt_root)
2054                         break;
2055         }
2056         err = vfs_getattr(&path, stat);
2057         path_put(&path);
2058         return err;
2059 }
2060
2061 /*
2062  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2063  * ourselves.
2064  *
2065  * countp is the buffer size in _words_
2066  */
2067 __be32
2068 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2069                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
2070                 struct svc_rqst *rqstp, int ignore_crossmnt)
2071 {
2072         u32 bmval0 = bmval[0];
2073         u32 bmval1 = bmval[1];
2074         u32 bmval2 = bmval[2];
2075         struct kstat stat;
2076         struct svc_fh tempfh;
2077         struct kstatfs statfs;
2078         int buflen = count << 2;
2079         __be32 *attrlenp;
2080         u32 dummy;
2081         u64 dummy64;
2082         u32 rdattr_err = 0;
2083         __be32 *p = *buffer;
2084         __be32 status;
2085         int err;
2086         int aclsupport = 0;
2087         struct nfs4_acl *acl = NULL;
2088         void *context = NULL;
2089         int contextlen;
2090         bool contextsupport = false;
2091         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2092         u32 minorversion = resp->cstate.minorversion;
2093         struct path path = {
2094                 .mnt    = exp->ex_path.mnt,
2095                 .dentry = dentry,
2096         };
2097         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2098
2099         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2100         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2101         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2102         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2103
2104         if (exp->ex_fslocs.migrated) {
2105                 BUG_ON(bmval[2]);
2106                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2107                 if (status)
2108                         goto out;
2109         }
2110
2111         err = vfs_getattr(&path, &stat);
2112         if (err)
2113                 goto out_nfserr;
2114         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2115                         FATTR4_WORD0_MAXNAME)) ||
2116             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2117                        FATTR4_WORD1_SPACE_TOTAL))) {
2118                 err = vfs_statfs(&path, &statfs);
2119                 if (err)
2120                         goto out_nfserr;
2121         }
2122         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2123                 fh_init(&tempfh, NFS4_FHSIZE);
2124                 status = fh_compose(&tempfh, exp, dentry, NULL);
2125                 if (status)
2126                         goto out;
2127                 fhp = &tempfh;
2128         }
2129         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2130                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2131                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2132                 aclsupport = (err == 0);
2133                 if (bmval0 & FATTR4_WORD0_ACL) {
2134                         if (err == -EOPNOTSUPP)
2135                                 bmval0 &= ~FATTR4_WORD0_ACL;
2136                         else if (err == -EINVAL) {
2137                                 status = nfserr_attrnotsupp;
2138                                 goto out;
2139                         } else if (err != 0)
2140                                 goto out_nfserr;
2141                 }
2142         }
2143
2144 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2145         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2146                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2147                 err = security_inode_getsecctx(dentry->d_inode,
2148                                                 &context, &contextlen);
2149                 contextsupport = (err == 0);
2150                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2151                         if (err == -EOPNOTSUPP)
2152                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2153                         else if (err)
2154                                 goto out_nfserr;
2155                 }
2156         }
2157 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2158
2159         if (bmval2) {
2160                 if ((buflen -= 16) < 0)
2161                         goto out_resource;
2162                 WRITE32(3);
2163                 WRITE32(bmval0);
2164                 WRITE32(bmval1);
2165                 WRITE32(bmval2);
2166         } else if (bmval1) {
2167                 if ((buflen -= 12) < 0)
2168                         goto out_resource;
2169                 WRITE32(2);
2170                 WRITE32(bmval0);
2171                 WRITE32(bmval1);
2172         } else {
2173                 if ((buflen -= 8) < 0)
2174                         goto out_resource;
2175                 WRITE32(1);
2176                 WRITE32(bmval0);
2177         }
2178         attrlenp = p++;                /* to be backfilled later */
2179
2180         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2181                 u32 word0 = nfsd_suppattrs0(minorversion);
2182                 u32 word1 = nfsd_suppattrs1(minorversion);
2183                 u32 word2 = nfsd_suppattrs2(minorversion);
2184
2185                 if (!aclsupport)
2186                         word0 &= ~FATTR4_WORD0_ACL;
2187                 if (!contextsupport)
2188                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2189                 if (!word2) {
2190                         if ((buflen -= 12) < 0)
2191                                 goto out_resource;
2192                         WRITE32(2);
2193                         WRITE32(word0);
2194                         WRITE32(word1);
2195                 } else {
2196                         if ((buflen -= 16) < 0)
2197                                 goto out_resource;
2198                         WRITE32(3);
2199                         WRITE32(word0);
2200                         WRITE32(word1);
2201                         WRITE32(word2);
2202                 }
2203         }
2204         if (bmval0 & FATTR4_WORD0_TYPE) {
2205                 if ((buflen -= 4) < 0)
2206                         goto out_resource;
2207                 dummy = nfs4_file_type(stat.mode);
2208                 if (dummy == NF4BAD)
2209                         goto out_serverfault;
2210                 WRITE32(dummy);
2211         }
2212         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2213                 if ((buflen -= 4) < 0)
2214                         goto out_resource;
2215                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2216                         WRITE32(NFS4_FH_PERSISTENT);
2217                 else
2218                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2219         }
2220         if (bmval0 & FATTR4_WORD0_CHANGE) {
2221                 if ((buflen -= 8) < 0)
2222                         goto out_resource;
2223                 write_change(&p, &stat, dentry->d_inode);
2224         }
2225         if (bmval0 & FATTR4_WORD0_SIZE) {
2226                 if ((buflen -= 8) < 0)
2227                         goto out_resource;
2228                 WRITE64(stat.size);
2229         }
2230         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2231                 if ((buflen -= 4) < 0)
2232                         goto out_resource;
2233                 WRITE32(1);
2234         }
2235         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2236                 if ((buflen -= 4) < 0)
2237                         goto out_resource;
2238                 WRITE32(1);
2239         }
2240         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2241                 if ((buflen -= 4) < 0)
2242                         goto out_resource;
2243                 WRITE32(0);
2244         }
2245         if (bmval0 & FATTR4_WORD0_FSID) {
2246                 if ((buflen -= 16) < 0)
2247                         goto out_resource;
2248                 if (exp->ex_fslocs.migrated) {
2249                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2250                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2251                 } else switch(fsid_source(fhp)) {
2252                 case FSIDSOURCE_FSID:
2253                         WRITE64((u64)exp->ex_fsid);
2254                         WRITE64((u64)0);
2255                         break;
2256                 case FSIDSOURCE_DEV:
2257                         WRITE32(0);
2258                         WRITE32(MAJOR(stat.dev));
2259                         WRITE32(0);
2260                         WRITE32(MINOR(stat.dev));
2261                         break;
2262                 case FSIDSOURCE_UUID:
2263                         WRITEMEM(exp->ex_uuid, 16);
2264                         break;
2265                 }
2266         }
2267         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2268                 if ((buflen -= 4) < 0)
2269                         goto out_resource;
2270                 WRITE32(0);
2271         }
2272         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2273                 if ((buflen -= 4) < 0)
2274                         goto out_resource;
2275                 WRITE32(nn->nfsd4_lease);
2276         }
2277         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2278                 if ((buflen -= 4) < 0)
2279                         goto out_resource;
2280                 WRITE32(rdattr_err);
2281         }
2282         if (bmval0 & FATTR4_WORD0_ACL) {
2283                 struct nfs4_ace *ace;
2284
2285                 if (acl == NULL) {
2286                         if ((buflen -= 4) < 0)
2287                                 goto out_resource;
2288
2289                         WRITE32(0);
2290                         goto out_acl;
2291                 }
2292                 if ((buflen -= 4) < 0)
2293                         goto out_resource;
2294                 WRITE32(acl->naces);
2295
2296                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2297                         if ((buflen -= 4*3) < 0)
2298                                 goto out_resource;
2299                         WRITE32(ace->type);
2300                         WRITE32(ace->flag);
2301                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2302                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2303                         if (status == nfserr_resource)
2304                                 goto out_resource;
2305                         if (status)
2306                                 goto out;
2307                 }
2308         }
2309 out_acl:
2310         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2311                 if ((buflen -= 4) < 0)
2312                         goto out_resource;
2313                 WRITE32(aclsupport ?
2314                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2315         }
2316         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2317                 if ((buflen -= 4) < 0)
2318                         goto out_resource;
2319                 WRITE32(1);
2320         }
2321         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2322                 if ((buflen -= 4) < 0)
2323                         goto out_resource;
2324                 WRITE32(0);
2325         }
2326         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2327                 if ((buflen -= 4) < 0)
2328                         goto out_resource;
2329                 WRITE32(1);
2330         }
2331         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2332                 if ((buflen -= 4) < 0)
2333                         goto out_resource;
2334                 WRITE32(1);
2335         }
2336         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2337                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2338                 if (buflen < 0)
2339                         goto out_resource;
2340                 WRITE32(fhp->fh_handle.fh_size);
2341                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2342         }
2343         if (bmval0 & FATTR4_WORD0_FILEID) {
2344                 if ((buflen -= 8) < 0)
2345                         goto out_resource;
2346                 WRITE64(stat.ino);
2347         }
2348         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2349                 if ((buflen -= 8) < 0)
2350                         goto out_resource;
2351                 WRITE64((u64) statfs.f_ffree);
2352         }
2353         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2354                 if ((buflen -= 8) < 0)
2355                         goto out_resource;
2356                 WRITE64((u64) statfs.f_ffree);
2357         }
2358         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2359                 if ((buflen -= 8) < 0)
2360                         goto out_resource;
2361                 WRITE64((u64) statfs.f_files);
2362         }
2363         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2364                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2365                 if (status == nfserr_resource)
2366                         goto out_resource;
2367                 if (status)
2368                         goto out;
2369         }
2370         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2371                 if ((buflen -= 4) < 0)
2372                         goto out_resource;
2373                 WRITE32(1);
2374         }
2375         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2376                 if ((buflen -= 8) < 0)
2377                         goto out_resource;
2378                 WRITE64(~(u64)0);
2379         }
2380         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2381                 if ((buflen -= 4) < 0)
2382                         goto out_resource;
2383                 WRITE32(255);
2384         }
2385         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2386                 if ((buflen -= 4) < 0)
2387                         goto out_resource;
2388                 WRITE32(statfs.f_namelen);
2389         }
2390         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2391                 if ((buflen -= 8) < 0)
2392                         goto out_resource;
2393                 WRITE64((u64) svc_max_payload(rqstp));
2394         }
2395         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2396                 if ((buflen -= 8) < 0)
2397                         goto out_resource;
2398                 WRITE64((u64) svc_max_payload(rqstp));
2399         }
2400         if (bmval1 & FATTR4_WORD1_MODE) {
2401                 if ((buflen -= 4) < 0)
2402                         goto out_resource;
2403                 WRITE32(stat.mode & S_IALLUGO);
2404         }
2405         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2406                 if ((buflen -= 4) < 0)
2407                         goto out_resource;
2408                 WRITE32(1);
2409         }
2410         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2411                 if ((buflen -= 4) < 0)
2412                         goto out_resource;
2413                 WRITE32(stat.nlink);
2414         }
2415         if (bmval1 & FATTR4_WORD1_OWNER) {
2416                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2417                 if (status == nfserr_resource)
2418                         goto out_resource;
2419                 if (status)
2420                         goto out;
2421         }
2422         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2423                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2424                 if (status == nfserr_resource)
2425                         goto out_resource;
2426                 if (status)
2427                         goto out;
2428         }
2429         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2430                 if ((buflen -= 8) < 0)
2431                         goto out_resource;
2432                 WRITE32((u32) MAJOR(stat.rdev));
2433                 WRITE32((u32) MINOR(stat.rdev));
2434         }
2435         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2436                 if ((buflen -= 8) < 0)
2437                         goto out_resource;
2438                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2439                 WRITE64(dummy64);
2440         }
2441         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2442                 if ((buflen -= 8) < 0)
2443                         goto out_resource;
2444                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2445                 WRITE64(dummy64);
2446         }
2447         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2448                 if ((buflen -= 8) < 0)
2449                         goto out_resource;
2450                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2451                 WRITE64(dummy64);
2452         }
2453         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2454                 if ((buflen -= 8) < 0)
2455                         goto out_resource;
2456                 dummy64 = (u64)stat.blocks << 9;
2457                 WRITE64(dummy64);
2458         }
2459         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2460                 if ((buflen -= 12) < 0)
2461                         goto out_resource;
2462                 WRITE64((s64)stat.atime.tv_sec);
2463                 WRITE32(stat.atime.tv_nsec);
2464         }
2465         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2466                 if ((buflen -= 12) < 0)
2467                         goto out_resource;
2468                 WRITE32(0);
2469                 WRITE32(1);
2470                 WRITE32(0);
2471         }
2472         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2473                 if ((buflen -= 12) < 0)
2474                         goto out_resource;
2475                 WRITE64((s64)stat.ctime.tv_sec);
2476                 WRITE32(stat.ctime.tv_nsec);
2477         }
2478         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2479                 if ((buflen -= 12) < 0)
2480                         goto out_resource;
2481                 WRITE64((s64)stat.mtime.tv_sec);
2482                 WRITE32(stat.mtime.tv_nsec);
2483         }
2484         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2485                 if ((buflen -= 8) < 0)
2486                         goto out_resource;
2487                 /*
2488                  * Get parent's attributes if not ignoring crossmount
2489                  * and this is the root of a cross-mounted filesystem.
2490                  */
2491                 if (ignore_crossmnt == 0 &&
2492                     dentry == exp->ex_path.mnt->mnt_root)
2493                         get_parent_attributes(exp, &stat);
2494                 WRITE64(stat.ino);
2495         }
2496         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2497                 status = nfsd4_encode_security_label(rqstp, context,
2498                                 contextlen, &p, &buflen);
2499                 if (status)
2500                         goto out;
2501         }
2502         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2503                 WRITE32(3);
2504                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2505                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2506                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2507         }
2508
2509         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2510         *buffer = p;
2511         status = nfs_ok;
2512
2513 out:
2514 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2515         if (context)
2516                 security_release_secctx(context, contextlen);
2517 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2518         kfree(acl);
2519         if (fhp == &tempfh)
2520                 fh_put(&tempfh);
2521         return status;
2522 out_nfserr:
2523         status = nfserrno(err);
2524         goto out;
2525 out_resource:
2526         status = nfserr_resource;
2527         goto out;
2528 out_serverfault:
2529         status = nfserr_serverfault;
2530         goto out;
2531 }
2532
2533 static inline int attributes_need_mount(u32 *bmval)
2534 {
2535         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2536                 return 1;
2537         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2538                 return 1;
2539         return 0;
2540 }
2541
2542 static __be32
2543 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2544                 const char *name, int namlen, __be32 **p, int buflen)
2545 {
2546         struct svc_export *exp = cd->rd_fhp->fh_export;
2547         struct dentry *dentry;
2548         __be32 nfserr;
2549         int ignore_crossmnt = 0;
2550
2551         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2552         if (IS_ERR(dentry))
2553                 return nfserrno(PTR_ERR(dentry));
2554         if (!dentry->d_inode) {
2555                 /*
2556                  * nfsd_buffered_readdir drops the i_mutex between
2557                  * readdir and calling this callback, leaving a window
2558                  * where this directory entry could have gone away.
2559                  */
2560                 dput(dentry);
2561                 return nfserr_noent;
2562         }
2563
2564         exp_get(exp);
2565         /*
2566          * In the case of a mountpoint, the client may be asking for
2567          * attributes that are only properties of the underlying filesystem
2568          * as opposed to the cross-mounted file system. In such a case,
2569          * we will not follow the cross mount and will fill the attribtutes
2570          * directly from the mountpoint dentry.
2571          */
2572         if (nfsd_mountpoint(dentry, exp)) {
2573                 int err;
2574
2575                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2576                                 && !attributes_need_mount(cd->rd_bmval)) {
2577                         ignore_crossmnt = 1;
2578                         goto out_encode;
2579                 }
2580                 /*
2581                  * Why the heck aren't we just using nfsd_lookup??
2582                  * Different "."/".." handling?  Something else?
2583                  * At least, add a comment here to explain....
2584                  */
2585                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2586                 if (err) {
2587                         nfserr = nfserrno(err);
2588                         goto out_put;
2589                 }
2590                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2591                 if (nfserr)
2592                         goto out_put;
2593
2594         }
2595 out_encode:
2596         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2597                                         cd->rd_rqstp, ignore_crossmnt);
2598 out_put:
2599         dput(dentry);
2600         exp_put(exp);
2601         return nfserr;
2602 }
2603
2604 static __be32 *
2605 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2606 {
2607         __be32 *attrlenp;
2608
2609         if (buflen < 6)
2610                 return NULL;
2611         *p++ = htonl(2);
2612         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2613         *p++ = htonl(0);                         /* bmval1 */
2614
2615         attrlenp = p++;
2616         *p++ = nfserr;       /* no htonl */
2617         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2618         return p;
2619 }
2620
2621 static int
2622 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2623                     loff_t offset, u64 ino, unsigned int d_type)
2624 {
2625         struct readdir_cd *ccd = ccdv;
2626         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2627         int buflen;
2628         __be32 *p = cd->buffer;
2629         __be32 *cookiep;
2630         __be32 nfserr = nfserr_toosmall;
2631
2632         /* In nfsv4, "." and ".." never make it onto the wire.. */
2633         if (name && isdotent(name, namlen)) {
2634                 cd->common.err = nfs_ok;
2635                 return 0;
2636         }
2637
2638         if (cd->offset)
2639                 xdr_encode_hyper(cd->offset, (u64) offset);
2640
2641         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2642         if (buflen < 0)
2643                 goto fail;
2644
2645         *p++ = xdr_one;                             /* mark entry present */
2646         cookiep = p;
2647         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2648         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2649
2650         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2651         switch (nfserr) {
2652         case nfs_ok:
2653                 break;
2654         case nfserr_resource:
2655                 nfserr = nfserr_toosmall;
2656                 goto fail;
2657         case nfserr_noent:
2658                 goto skip_entry;
2659         default:
2660                 /*
2661                  * If the client requested the RDATTR_ERROR attribute,
2662                  * we stuff the error code into this attribute
2663                  * and continue.  If this attribute was not requested,
2664                  * then in accordance with the spec, we fail the
2665                  * entire READDIR operation(!)
2666                  */
2667                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2668                         goto fail;
2669                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2670                 if (p == NULL) {
2671                         nfserr = nfserr_toosmall;
2672                         goto fail;
2673                 }
2674         }
2675         cd->buflen -= (p - cd->buffer);
2676         cd->buffer = p;
2677         cd->offset = cookiep;
2678 skip_entry:
2679         cd->common.err = nfs_ok;
2680         return 0;
2681 fail:
2682         cd->common.err = nfserr;
2683         return -EINVAL;
2684 }
2685
2686 static void
2687 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2688 {
2689         __be32 *p;
2690
2691         RESERVE_SPACE(sizeof(stateid_t));
2692         WRITE32(sid->si_generation);
2693         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2694         ADJUST_ARGS();
2695 }
2696
2697 static __be32
2698 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2699 {
2700         __be32 *p;
2701
2702         if (!nfserr) {
2703                 RESERVE_SPACE(8);
2704                 WRITE32(access->ac_supported);
2705                 WRITE32(access->ac_resp_access);
2706                 ADJUST_ARGS();
2707         }
2708         return nfserr;
2709 }
2710
2711 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2712 {
2713         __be32 *p;
2714
2715         if (!nfserr) {
2716                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2717                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2718                 WRITE32(bcts->dir);
2719                 /* Sorry, we do not yet support RDMA over 4.1: */
2720                 WRITE32(0);
2721                 ADJUST_ARGS();
2722         }
2723         return nfserr;
2724 }
2725
2726 static __be32
2727 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2728 {
2729         if (!nfserr)
2730                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2731
2732         return nfserr;
2733 }
2734
2735
2736 static __be32
2737 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2738 {
2739         __be32 *p;
2740
2741         if (!nfserr) {
2742                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2743                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2744                 ADJUST_ARGS();
2745         }
2746         return nfserr;
2747 }
2748
2749 static __be32
2750 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2751 {
2752         __be32 *p;
2753
2754         if (!nfserr) {
2755                 RESERVE_SPACE(32);
2756                 write_cinfo(&p, &create->cr_cinfo);
2757                 WRITE32(2);
2758                 WRITE32(create->cr_bmval[0]);
2759                 WRITE32(create->cr_bmval[1]);
2760                 ADJUST_ARGS();
2761         }
2762         return nfserr;
2763 }
2764
2765 static __be32
2766 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2767 {
2768         struct svc_fh *fhp = getattr->ga_fhp;
2769         int buflen;
2770
2771         if (nfserr)
2772                 return nfserr;
2773
2774         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2775         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2776                                     &resp->p, buflen, getattr->ga_bmval,
2777                                     resp->rqstp, 0);
2778         return nfserr;
2779 }
2780
2781 static __be32
2782 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2783 {
2784         struct svc_fh *fhp = *fhpp;
2785         unsigned int len;
2786         __be32 *p;
2787
2788         if (!nfserr) {
2789                 len = fhp->fh_handle.fh_size;
2790                 RESERVE_SPACE(len + 4);
2791                 WRITE32(len);
2792                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2793                 ADJUST_ARGS();
2794         }
2795         return nfserr;
2796 }
2797
2798 /*
2799 * Including all fields other than the name, a LOCK4denied structure requires
2800 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2801 */
2802 static void
2803 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2804 {
2805         struct xdr_netobj *conf = &ld->ld_owner;
2806         __be32 *p;
2807
2808         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2809         WRITE64(ld->ld_start);
2810         WRITE64(ld->ld_length);
2811         WRITE32(ld->ld_type);
2812         if (conf->len) {
2813                 WRITEMEM(&ld->ld_clientid, 8);
2814                 WRITE32(conf->len);
2815                 WRITEMEM(conf->data, conf->len);
2816                 kfree(conf->data);
2817         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2818                 WRITE64((u64)0); /* clientid */
2819                 WRITE32(0); /* length of owner name */
2820         }
2821         ADJUST_ARGS();
2822 }
2823
2824 static __be32
2825 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2826 {
2827         if (!nfserr)
2828                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2829         else if (nfserr == nfserr_denied)
2830                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2831
2832         return nfserr;
2833 }
2834
2835 static __be32
2836 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2837 {
2838         if (nfserr == nfserr_denied)
2839                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2840         return nfserr;
2841 }
2842
2843 static __be32
2844 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2845 {
2846         if (!nfserr)
2847                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2848
2849         return nfserr;
2850 }
2851
2852
2853 static __be32
2854 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2855 {
2856         __be32 *p;
2857
2858         if (!nfserr) {
2859                 RESERVE_SPACE(20);
2860                 write_cinfo(&p, &link->li_cinfo);
2861                 ADJUST_ARGS();
2862         }
2863         return nfserr;
2864 }
2865
2866
2867 static __be32
2868 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2869 {
2870         __be32 *p;
2871
2872         if (nfserr)
2873                 goto out;
2874
2875         nfsd4_encode_stateid(resp, &open->op_stateid);
2876         RESERVE_SPACE(40);
2877         write_cinfo(&p, &open->op_cinfo);
2878         WRITE32(open->op_rflags);
2879         WRITE32(2);
2880         WRITE32(open->op_bmval[0]);
2881         WRITE32(open->op_bmval[1]);
2882         WRITE32(open->op_delegate_type);
2883         ADJUST_ARGS();
2884
2885         switch (open->op_delegate_type) {
2886         case NFS4_OPEN_DELEGATE_NONE:
2887                 break;
2888         case NFS4_OPEN_DELEGATE_READ:
2889                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2890                 RESERVE_SPACE(20);
2891                 WRITE32(open->op_recall);
2892
2893                 /*
2894                  * TODO: ACE's in delegations
2895                  */
2896                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2897                 WRITE32(0);
2898                 WRITE32(0);
2899                 WRITE32(0);   /* XXX: is NULL principal ok? */
2900                 ADJUST_ARGS();
2901                 break;
2902         case NFS4_OPEN_DELEGATE_WRITE:
2903                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2904                 RESERVE_SPACE(32);
2905                 WRITE32(0);
2906
2907                 /*
2908                  * TODO: space_limit's in delegations
2909                  */
2910                 WRITE32(NFS4_LIMIT_SIZE);
2911                 WRITE32(~(u32)0);
2912                 WRITE32(~(u32)0);
2913
2914                 /*
2915                  * TODO: ACE's in delegations
2916                  */
2917                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2918                 WRITE32(0);
2919                 WRITE32(0);
2920                 WRITE32(0);   /* XXX: is NULL principal ok? */
2921                 ADJUST_ARGS();
2922                 break;
2923         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2924                 switch (open->op_why_no_deleg) {
2925                 case WND4_CONTENTION:
2926                 case WND4_RESOURCE:
2927                         RESERVE_SPACE(8);
2928                         WRITE32(open->op_why_no_deleg);
2929                         WRITE32(0);     /* deleg signaling not supported yet */
2930                         break;
2931                 default:
2932                         RESERVE_SPACE(4);
2933                         WRITE32(open->op_why_no_deleg);
2934                 }
2935                 ADJUST_ARGS();
2936                 break;
2937         default:
2938                 BUG();
2939         }
2940         /* XXX save filehandle here */
2941 out:
2942         return nfserr;
2943 }
2944
2945 static __be32
2946 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2947 {
2948         if (!nfserr)
2949                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2950
2951         return nfserr;
2952 }
2953
2954 static __be32
2955 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2956 {
2957         if (!nfserr)
2958                 nfsd4_encode_stateid(resp, &od->od_stateid);
2959
2960         return nfserr;
2961 }
2962
2963 static __be32
2964 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2965                   struct nfsd4_read *read)
2966 {
2967         u32 eof;
2968         int v;
2969         struct page *page;
2970         unsigned long maxcount;
2971         long len;
2972         __be32 *p;
2973
2974         if (nfserr)
2975                 return nfserr;
2976         if (resp->xbuf->page_len)
2977                 return nfserr_resource;
2978
2979         RESERVE_SPACE(8); /* eof flag and byte count */
2980
2981         maxcount = svc_max_payload(resp->rqstp);
2982         if (maxcount > read->rd_length)
2983                 maxcount = read->rd_length;
2984
2985         len = maxcount;
2986         v = 0;
2987         while (len > 0) {
2988                 page = *(resp->rqstp->rq_next_page);
2989                 if (!page) { /* ran out of pages */
2990                         maxcount -= len;
2991                         break;
2992                 }
2993                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2994                 resp->rqstp->rq_vec[v].iov_len =
2995                         len < PAGE_SIZE ? len : PAGE_SIZE;
2996                 resp->rqstp->rq_next_page++;
2997                 v++;
2998                 len -= PAGE_SIZE;
2999         }
3000         read->rd_vlen = v;
3001
3002         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3003                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
3004                         &maxcount);
3005
3006         if (nfserr)
3007                 return nfserr;
3008         eof = (read->rd_offset + maxcount >=
3009                read->rd_fhp->fh_dentry->d_inode->i_size);
3010
3011         WRITE32(eof);
3012         WRITE32(maxcount);
3013         ADJUST_ARGS();
3014         resp->xbuf->head[0].iov_len = (char*)p
3015                                         - (char*)resp->xbuf->head[0].iov_base;
3016         resp->xbuf->page_len = maxcount;
3017
3018         /* Use rest of head for padding and remaining ops: */
3019         resp->xbuf->tail[0].iov_base = p;
3020         resp->xbuf->tail[0].iov_len = 0;
3021         if (maxcount&3) {
3022                 RESERVE_SPACE(4);
3023                 WRITE32(0);
3024                 resp->xbuf->tail[0].iov_base += maxcount&3;
3025                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3026                 ADJUST_ARGS();
3027         }
3028         return 0;
3029 }
3030
3031 static __be32
3032 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3033 {
3034         int maxcount;
3035         char *page;
3036         __be32 *p;
3037
3038         if (nfserr)
3039                 return nfserr;
3040         if (resp->xbuf->page_len)
3041                 return nfserr_resource;
3042         if (!*resp->rqstp->rq_next_page)
3043                 return nfserr_resource;
3044
3045         page = page_address(*(resp->rqstp->rq_next_page++));
3046
3047         maxcount = PAGE_SIZE;
3048         RESERVE_SPACE(4);
3049
3050         /*
3051          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3052          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3053          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3054          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3055          */
3056         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3057         if (nfserr == nfserr_isdir)
3058                 return nfserr_inval;
3059         if (nfserr)
3060                 return nfserr;
3061
3062         WRITE32(maxcount);
3063         ADJUST_ARGS();
3064         resp->xbuf->head[0].iov_len = (char*)p
3065                                 - (char*)resp->xbuf->head[0].iov_base;
3066         resp->xbuf->page_len = maxcount;
3067
3068         /* Use rest of head for padding and remaining ops: */
3069         resp->xbuf->tail[0].iov_base = p;
3070         resp->xbuf->tail[0].iov_len = 0;
3071         if (maxcount&3) {
3072                 RESERVE_SPACE(4);
3073                 WRITE32(0);
3074                 resp->xbuf->tail[0].iov_base += maxcount&3;
3075                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3076                 ADJUST_ARGS();
3077         }
3078         return 0;
3079 }
3080
3081 static __be32
3082 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3083 {
3084         int maxcount;
3085         loff_t offset;
3086         __be32 *page, *savep, *tailbase;
3087         __be32 *p;
3088
3089         if (nfserr)
3090                 return nfserr;
3091         if (resp->xbuf->page_len)
3092                 return nfserr_resource;
3093         if (!*resp->rqstp->rq_next_page)
3094                 return nfserr_resource;
3095
3096         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3097         savep = p;
3098
3099         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3100         WRITE32(0);
3101         WRITE32(0);
3102         ADJUST_ARGS();
3103         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3104         tailbase = p;
3105
3106         maxcount = PAGE_SIZE;
3107         if (maxcount > readdir->rd_maxcount)
3108                 maxcount = readdir->rd_maxcount;
3109
3110         /*
3111          * Convert from bytes to words, account for the two words already
3112          * written, make sure to leave two words at the end for the next
3113          * pointer and eof field.
3114          */
3115         maxcount = (maxcount >> 2) - 4;
3116         if (maxcount < 0) {
3117                 nfserr =  nfserr_toosmall;
3118                 goto err_no_verf;
3119         }
3120
3121         page = page_address(*(resp->rqstp->rq_next_page++));
3122         readdir->common.err = 0;
3123         readdir->buflen = maxcount;
3124         readdir->buffer = page;
3125         readdir->offset = NULL;
3126
3127         offset = readdir->rd_cookie;
3128         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3129                               &offset,
3130                               &readdir->common, nfsd4_encode_dirent);
3131         if (nfserr == nfs_ok &&
3132             readdir->common.err == nfserr_toosmall &&
3133             readdir->buffer == page)
3134                 nfserr = nfserr_toosmall;
3135         if (nfserr)
3136                 goto err_no_verf;
3137
3138         if (readdir->offset)
3139                 xdr_encode_hyper(readdir->offset, offset);
3140
3141         p = readdir->buffer;
3142         *p++ = 0;       /* no more entries */
3143         *p++ = htonl(readdir->common.err == nfserr_eof);
3144         resp->xbuf->page_len = ((char*)p) -
3145                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3146
3147         /* Use rest of head for padding and remaining ops: */
3148         resp->xbuf->tail[0].iov_base = tailbase;
3149         resp->xbuf->tail[0].iov_len = 0;
3150         resp->p = resp->xbuf->tail[0].iov_base;
3151         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3152
3153         return 0;
3154 err_no_verf:
3155         p = savep;
3156         ADJUST_ARGS();
3157         return nfserr;
3158 }
3159
3160 static __be32
3161 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3162 {
3163         __be32 *p;
3164
3165         if (!nfserr) {
3166                 RESERVE_SPACE(20);
3167                 write_cinfo(&p, &remove->rm_cinfo);
3168                 ADJUST_ARGS();
3169         }
3170         return nfserr;
3171 }
3172
3173 static __be32
3174 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3175 {
3176         __be32 *p;
3177
3178         if (!nfserr) {
3179                 RESERVE_SPACE(40);
3180                 write_cinfo(&p, &rename->rn_sinfo);
3181                 write_cinfo(&p, &rename->rn_tinfo);
3182                 ADJUST_ARGS();
3183         }
3184         return nfserr;
3185 }
3186
3187 static __be32
3188 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3189                          __be32 nfserr, struct svc_export *exp)
3190 {
3191         u32 i, nflavs, supported;
3192         struct exp_flavor_info *flavs;
3193         struct exp_flavor_info def_flavs[2];
3194         __be32 *p, *flavorsp;
3195         static bool report = true;
3196
3197         if (nfserr)
3198                 goto out;
3199         if (exp->ex_nflavors) {
3200                 flavs = exp->ex_flavors;
3201                 nflavs = exp->ex_nflavors;
3202         } else { /* Handling of some defaults in absence of real secinfo: */
3203                 flavs = def_flavs;
3204                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3205                         nflavs = 2;
3206                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3207                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3208                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3209                         nflavs = 1;
3210                         flavs[0].pseudoflavor
3211                                         = svcauth_gss_flavor(exp->ex_client);
3212                 } else {
3213                         nflavs = 1;
3214                         flavs[0].pseudoflavor
3215                                         = exp->ex_client->flavour->flavour;
3216                 }
3217         }
3218
3219         supported = 0;
3220         RESERVE_SPACE(4);
3221         flavorsp = p++;         /* to be backfilled later */
3222         ADJUST_ARGS();
3223
3224         for (i = 0; i < nflavs; i++) {
3225                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3226                 struct rpcsec_gss_info info;
3227
3228                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3229                         supported++;
3230                         RESERVE_SPACE(4 + 4 + info.oid.len + 4 + 4);
3231                         WRITE32(RPC_AUTH_GSS);
3232                         WRITE32(info.oid.len);
3233                         WRITEMEM(info.oid.data, info.oid.len);
3234                         WRITE32(info.qop);
3235                         WRITE32(info.service);
3236                         ADJUST_ARGS();
3237                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3238                         supported++;
3239                         RESERVE_SPACE(4);
3240                         WRITE32(pf);
3241                         ADJUST_ARGS();
3242                 } else {
3243                         if (report)
3244                                 pr_warn("NFS: SECINFO: security flavor %u "
3245                                         "is not supported\n", pf);
3246                 }
3247         }
3248
3249         if (nflavs != supported)
3250                 report = false;
3251         *flavorsp = htonl(supported);
3252
3253 out:
3254         if (exp)
3255                 exp_put(exp);
3256         return nfserr;
3257 }
3258
3259 static __be32
3260 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3261                      struct nfsd4_secinfo *secinfo)
3262 {
3263         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3264 }
3265
3266 static __be32
3267 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3268                      struct nfsd4_secinfo_no_name *secinfo)
3269 {
3270         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3271 }
3272
3273 /*
3274  * The SETATTR encode routine is special -- it always encodes a bitmap,
3275  * regardless of the error status.
3276  */
3277 static __be32
3278 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3279 {
3280         __be32 *p;
3281
3282         RESERVE_SPACE(16);
3283         if (nfserr) {
3284                 WRITE32(3);
3285                 WRITE32(0);
3286                 WRITE32(0);
3287                 WRITE32(0);
3288         }
3289         else {
3290                 WRITE32(3);
3291                 WRITE32(setattr->sa_bmval[0]);
3292                 WRITE32(setattr->sa_bmval[1]);
3293                 WRITE32(setattr->sa_bmval[2]);
3294         }
3295         ADJUST_ARGS();
3296         return nfserr;
3297 }
3298
3299 static __be32
3300 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3301 {
3302         __be32 *p;
3303
3304         if (!nfserr) {
3305                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3306                 WRITEMEM(&scd->se_clientid, 8);
3307                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3308                 ADJUST_ARGS();
3309         }
3310         else if (nfserr == nfserr_clid_inuse) {
3311                 RESERVE_SPACE(8);
3312                 WRITE32(0);
3313                 WRITE32(0);
3314                 ADJUST_ARGS();
3315         }
3316         return nfserr;
3317 }
3318
3319 static __be32
3320 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3321 {
3322         __be32 *p;
3323
3324         if (!nfserr) {
3325                 RESERVE_SPACE(16);
3326                 WRITE32(write->wr_bytes_written);
3327                 WRITE32(write->wr_how_written);
3328                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3329                 ADJUST_ARGS();
3330         }
3331         return nfserr;
3332 }
3333
3334 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3335         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3336               1 << (OP_EXCHANGE_ID - 32) |
3337               1 << (OP_CREATE_SESSION - 32) |
3338               1 << (OP_DESTROY_SESSION - 32) |
3339               1 << (OP_DESTROY_CLIENTID - 32)
3340 };
3341
3342 static __be32
3343 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3344                          struct nfsd4_exchange_id *exid)
3345 {
3346         __be32 *p;
3347         char *major_id;
3348         char *server_scope;
3349         int major_id_sz;
3350         int server_scope_sz;
3351         uint64_t minor_id = 0;
3352
3353         if (nfserr)
3354                 return nfserr;
3355
3356         major_id = utsname()->nodename;
3357         major_id_sz = strlen(major_id);
3358         server_scope = utsname()->nodename;
3359         server_scope_sz = strlen(server_scope);
3360
3361         RESERVE_SPACE(
3362                 8 /* eir_clientid */ +
3363                 4 /* eir_sequenceid */ +
3364                 4 /* eir_flags */ +
3365                 4 /* spr_how */ +
3366                 8 /* spo_must_enforce, spo_must_allow */ +
3367                 8 /* so_minor_id */ +
3368                 4 /* so_major_id.len */ +
3369                 (XDR_QUADLEN(major_id_sz) * 4) +
3370                 4 /* eir_server_scope.len */ +
3371                 (XDR_QUADLEN(server_scope_sz) * 4) +
3372                 4 /* eir_server_impl_id.count (0) */);
3373
3374         WRITEMEM(&exid->clientid, 8);
3375         WRITE32(exid->seqid);
3376         WRITE32(exid->flags);
3377
3378         WRITE32(exid->spa_how);
3379         switch (exid->spa_how) {
3380         case SP4_NONE:
3381                 break;
3382         case SP4_MACH_CRED:
3383                 /* spo_must_enforce bitmap: */
3384                 WRITE32(2);
3385                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3386                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3387                 /* empty spo_must_allow bitmap: */
3388                 WRITE32(0);
3389                 break;
3390         default:
3391                 WARN_ON_ONCE(1);
3392         }
3393
3394         /* The server_owner struct */
3395         WRITE64(minor_id);      /* Minor id */
3396         /* major id */
3397         WRITE32(major_id_sz);
3398         WRITEMEM(major_id, major_id_sz);
3399
3400         /* Server scope */
3401         WRITE32(server_scope_sz);
3402         WRITEMEM(server_scope, server_scope_sz);
3403
3404         /* Implementation id */
3405         WRITE32(0);     /* zero length nfs_impl_id4 array */
3406         ADJUST_ARGS();
3407         return 0;
3408 }
3409
3410 static __be32
3411 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3412                             struct nfsd4_create_session *sess)
3413 {
3414         __be32 *p;
3415
3416         if (nfserr)
3417                 return nfserr;
3418
3419         RESERVE_SPACE(24);
3420         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3421         WRITE32(sess->seqid);
3422         WRITE32(sess->flags);
3423         ADJUST_ARGS();
3424
3425         RESERVE_SPACE(28);
3426         WRITE32(0); /* headerpadsz */
3427         WRITE32(sess->fore_channel.maxreq_sz);
3428         WRITE32(sess->fore_channel.maxresp_sz);
3429         WRITE32(sess->fore_channel.maxresp_cached);
3430         WRITE32(sess->fore_channel.maxops);
3431         WRITE32(sess->fore_channel.maxreqs);
3432         WRITE32(sess->fore_channel.nr_rdma_attrs);
3433         ADJUST_ARGS();
3434
3435         if (sess->fore_channel.nr_rdma_attrs) {
3436                 RESERVE_SPACE(4);
3437                 WRITE32(sess->fore_channel.rdma_attrs);
3438                 ADJUST_ARGS();
3439         }
3440
3441         RESERVE_SPACE(28);
3442         WRITE32(0); /* headerpadsz */
3443         WRITE32(sess->back_channel.maxreq_sz);
3444         WRITE32(sess->back_channel.maxresp_sz);
3445         WRITE32(sess->back_channel.maxresp_cached);
3446         WRITE32(sess->back_channel.maxops);
3447         WRITE32(sess->back_channel.maxreqs);
3448         WRITE32(sess->back_channel.nr_rdma_attrs);
3449         ADJUST_ARGS();
3450
3451         if (sess->back_channel.nr_rdma_attrs) {
3452                 RESERVE_SPACE(4);
3453                 WRITE32(sess->back_channel.rdma_attrs);
3454                 ADJUST_ARGS();
3455         }
3456         return 0;
3457 }
3458
3459 static __be32
3460 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3461                              struct nfsd4_destroy_session *destroy_session)
3462 {
3463         return nfserr;
3464 }
3465
3466 static __be32
3467 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3468                           struct nfsd4_free_stateid *free_stateid)
3469 {
3470         __be32 *p;
3471
3472         if (nfserr)
3473                 return nfserr;
3474
3475         RESERVE_SPACE(4);
3476         *p++ = nfserr;
3477         ADJUST_ARGS();
3478         return nfserr;
3479 }
3480
3481 static __be32
3482 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3483                       struct nfsd4_sequence *seq)
3484 {
3485         __be32 *p;
3486
3487         if (nfserr)
3488                 return nfserr;
3489
3490         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3491         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3492         WRITE32(seq->seqid);
3493         WRITE32(seq->slotid);
3494         /* Note slotid's are numbered from zero: */
3495         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3496         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3497         WRITE32(seq->status_flags);
3498
3499         ADJUST_ARGS();
3500         resp->cstate.datap = p; /* DRC cache data pointer */
3501         return 0;
3502 }
3503
3504 static __be32
3505 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3506                           struct nfsd4_test_stateid *test_stateid)
3507 {
3508         struct nfsd4_test_stateid_id *stateid, *next;
3509         __be32 *p;
3510
3511         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3512         *p++ = htonl(test_stateid->ts_num_ids);
3513
3514         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3515                 *p++ = stateid->ts_id_status;
3516         }
3517
3518         ADJUST_ARGS();
3519         return nfserr;
3520 }
3521
3522 static __be32
3523 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3524 {
3525         return nfserr;
3526 }
3527
3528 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3529
3530 /*
3531  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3532  * since we don't need to filter out obsolete ops as this is
3533  * done in the decoding phase.
3534  */
3535 static nfsd4_enc nfsd4_enc_ops[] = {
3536         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3537         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3538         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3539         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3540         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3541         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3542         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3543         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3544         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3545         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3546         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3547         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3548         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3549         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3550         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3551         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3552         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3553         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3554         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3555         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3556         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3557         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3558         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3559         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3560         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3561         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3562         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3563         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3564         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3565         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3566         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3567         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3568         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3569         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3570         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3571         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3572         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3573
3574         /* NFSv4.1 operations */
3575         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3576         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3577         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3578         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3579         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3580         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3581         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3582         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3583         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3584         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3585         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3586         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3587         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3588         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3589         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3590         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3591         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3592         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3593         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3594 };
3595
3596 /*
3597  * Calculate the total amount of memory that the compound response has taken
3598  * after encoding the current operation with pad.
3599  *
3600  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3601  *      which was specified at nfsd4_operation, else pad is zero.
3602  *
3603  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3604  *
3605  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3606  * will be at least a page and will therefore hold the xdr_buf head.
3607  */
3608 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3609 {
3610         struct xdr_buf *xb = &resp->rqstp->rq_res;
3611         struct nfsd4_session *session = NULL;
3612         struct nfsd4_slot *slot = resp->cstate.slot;
3613         u32 length, tlen = 0;
3614
3615         if (!nfsd4_has_session(&resp->cstate))
3616                 return 0;
3617
3618         session = resp->cstate.session;
3619         if (session == NULL)
3620                 return 0;
3621
3622         if (xb->page_len == 0) {
3623                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3624         } else {
3625                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3626                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3627
3628                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3629         }
3630         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3631                 length, xb->page_len, tlen, pad);
3632
3633         if (length > session->se_fchannel.maxresp_sz)
3634                 return nfserr_rep_too_big;
3635
3636         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3637             length > session->se_fchannel.maxresp_cached)
3638                 return nfserr_rep_too_big_to_cache;
3639
3640         return 0;
3641 }
3642
3643 void
3644 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3645 {
3646         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3647         __be32 *statp;
3648         __be32 *p;
3649
3650         RESERVE_SPACE(8);
3651         WRITE32(op->opnum);
3652         statp = p++;    /* to be backfilled at the end */
3653         ADJUST_ARGS();
3654
3655         if (op->opnum == OP_ILLEGAL)
3656                 goto status;
3657         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3658                !nfsd4_enc_ops[op->opnum]);
3659         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3660         /* nfsd4_check_drc_limit guarantees enough room for error status */
3661         if (!op->status)
3662                 op->status = nfsd4_check_resp_size(resp, 0);
3663         if (so) {
3664                 so->so_replay.rp_status = op->status;
3665                 so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3666                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3667         }
3668 status:
3669         /*
3670          * Note: We write the status directly, instead of using WRITE32(),
3671          * since it is already in network byte order.
3672          */
3673         *statp = op->status;
3674 }
3675
3676 /*
3677  * Encode the reply stored in the stateowner reply cache
3678  *
3679  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3680  * previously sent already encoded operation.
3681  *
3682  * called with nfs4_lock_state() held
3683  */
3684 void
3685 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3686 {
3687         __be32 *p;
3688         struct nfs4_replay *rp = op->replay;
3689
3690         BUG_ON(!rp);
3691
3692         RESERVE_SPACE(8);
3693         WRITE32(op->opnum);
3694         *p++ = rp->rp_status;  /* already xdr'ed */
3695         ADJUST_ARGS();
3696
3697         RESERVE_SPACE(rp->rp_buflen);
3698         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3699         ADJUST_ARGS();
3700 }
3701
3702 int
3703 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3704 {
3705         return xdr_ressize_check(rqstp, p);
3706 }
3707
3708 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3709 {
3710         struct svc_rqst *rqstp = rq;
3711         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3712
3713         if (args->ops != args->iops) {
3714                 kfree(args->ops);
3715                 args->ops = args->iops;
3716         }
3717         kfree(args->tmpp);
3718         args->tmpp = NULL;
3719         while (args->to_free) {
3720                 struct tmpbuf *tb = args->to_free;
3721                 args->to_free = tb->next;
3722                 tb->release(tb->buf);
3723                 kfree(tb);
3724         }
3725         return 1;
3726 }
3727
3728 int
3729 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3730 {
3731         args->p = p;
3732         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3733         args->pagelist = rqstp->rq_arg.pages;
3734         args->pagelen = rqstp->rq_arg.page_len;
3735         args->tmpp = NULL;
3736         args->to_free = NULL;
3737         args->ops = args->iops;
3738         args->rqstp = rqstp;
3739
3740         return !nfsd4_decode_compound(args);
3741 }
3742
3743 int
3744 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3745 {
3746         /*
3747          * All that remains is to write the tag and operation count...
3748          */
3749         struct nfsd4_compound_state *cs = &resp->cstate;
3750         struct kvec *iov;
3751         p = resp->tagp;
3752         *p++ = htonl(resp->taglen);
3753         memcpy(p, resp->tag, resp->taglen);
3754         p += XDR_QUADLEN(resp->taglen);
3755         *p++ = htonl(resp->opcnt);
3756
3757         if (rqstp->rq_res.page_len)
3758                 iov = &rqstp->rq_res.tail[0];
3759         else
3760                 iov = &rqstp->rq_res.head[0];
3761         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3762         BUG_ON(iov->iov_len > PAGE_SIZE);
3763         if (nfsd4_has_session(cs)) {
3764                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3765                 struct nfs4_client *clp = cs->session->se_client;
3766                 if (cs->status != nfserr_replay_cache) {
3767                         nfsd4_store_cache_entry(resp);
3768                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3769                 }
3770                 /* Renew the clientid on success and on replay */
3771                 spin_lock(&nn->client_lock);
3772                 nfsd4_put_session(cs->session);
3773                 spin_unlock(&nn->client_lock);
3774                 put_client_renew(clp);
3775         }
3776         return 1;
3777 }
3778
3779 /*
3780  * Local variables:
3781  *  c-basic-offset: 8
3782  * End:
3783  */