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         if (argp->minorversion >= 1)
 950                 return nfserr_notsupp;
 951
 952         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 953         if (status)
 954                 return status;
 955         READ_BUF(4);
 956         READ32(open_conf->oc_seqid);
 957
 958         DECODE_TAIL;
 959 }
 960
 961 static __be32
 962 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 963 {
 964         DECODE_HEAD;
 965
 966         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 967         if (status)
 968                 return status;
 969         READ_BUF(4);
 970         READ32(open_down->od_seqid);
 971         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 972                                            &open_down->od_deleg_want, NULL);
 973         if (status)
 974                 return status;
 975         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 976         if (status)
 977                 return status;
 978         DECODE_TAIL;
 979 }
 980
 981 static __be32
 982 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 983 {
 984         DECODE_HEAD;
 985
 986         READ_BUF(4);
 987         READ32(putfh->pf_fhlen);
 988         if (putfh->pf_fhlen > NFS4_FHSIZE)
 989                 goto xdr_error;
 990         READ_BUF(putfh->pf_fhlen);
 991         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 992
 993         DECODE_TAIL;
 994 }
 995
 996 static __be32
 997 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
 998 {
 999         if (argp->minorversion == 0)
1000                 return nfs_ok;
1001         return nfserr_notsupp;
1002 }
1003
1004 static __be32
1005 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1006 {
1007         DECODE_HEAD;
1008
1009         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1010         if (status)
1011                 return status;
1012         READ_BUF(12);
1013         READ64(read->rd_offset);
1014         READ32(read->rd_length);
1015
1016         DECODE_TAIL;
1017 }
1018
1019 static __be32
1020 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1021 {
1022         DECODE_HEAD;
1023
1024         READ_BUF(24);
1025         READ64(readdir->rd_cookie);
1026         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1027         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
1028         READ32(readdir->rd_maxcount);
1029         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1030                 goto out;
1031
1032         DECODE_TAIL;
1033 }
1034
1035 static __be32
1036 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1037 {
1038         DECODE_HEAD;
1039
1040         READ_BUF(4);
1041         READ32(remove->rm_namelen);
1042         READ_BUF(remove->rm_namelen);
1043         SAVEMEM(remove->rm_name, remove->rm_namelen);
1044         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1045                 return status;
1046
1047         DECODE_TAIL;
1048 }
1049
1050 static __be32
1051 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1052 {
1053         DECODE_HEAD;
1054
1055         READ_BUF(4);
1056         READ32(rename->rn_snamelen);
1057         READ_BUF(rename->rn_snamelen + 4);
1058         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1059         READ32(rename->rn_tnamelen);
1060         READ_BUF(rename->rn_tnamelen);
1061         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1062         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1063                 return status;
1064         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1065                 return status;
1066
1067         DECODE_TAIL;
1068 }
1069
1070 static __be32
1071 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1072 {
1073         DECODE_HEAD;
1074
1075         if (argp->minorversion >= 1)
1076                 return nfserr_notsupp;
1077
1078         READ_BUF(sizeof(clientid_t));
1079         COPYMEM(clientid, sizeof(clientid_t));
1080
1081         DECODE_TAIL;
1082 }
1083
1084 static __be32
1085 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1086                      struct nfsd4_secinfo *secinfo)
1087 {
1088         DECODE_HEAD;
1089
1090         READ_BUF(4);
1091         READ32(secinfo->si_namelen);
1092         READ_BUF(secinfo->si_namelen);
1093         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1094         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1095         if (status)
1096                 return status;
1097         DECODE_TAIL;
1098 }
1099
1100 static __be32
1101 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1102                      struct nfsd4_secinfo_no_name *sin)
1103 {
1104         DECODE_HEAD;
1105
1106         READ_BUF(4);
1107         READ32(sin->sin_style);
1108         DECODE_TAIL;
1109 }
1110
1111 static __be32
1112 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1113 {
1114         __be32 status;
1115
1116         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1117         if (status)
1118                 return status;
1119         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1120                                   &setattr->sa_acl, &setattr->sa_label);
1121 }
1122
1123 static __be32
1124 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1125 {
1126         DECODE_HEAD;
1127
1128         if (argp->minorversion >= 1)
1129                 return nfserr_notsupp;
1130
1131         READ_BUF(NFS4_VERIFIER_SIZE);
1132         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1133
1134         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1135         if (status)
1136                 return nfserr_bad_xdr;
1137         READ_BUF(8);
1138         READ32(setclientid->se_callback_prog);
1139         READ32(setclientid->se_callback_netid_len);
1140
1141         READ_BUF(setclientid->se_callback_netid_len + 4);
1142         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1143         READ32(setclientid->se_callback_addr_len);
1144
1145         READ_BUF(setclientid->se_callback_addr_len + 4);
1146         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1147         READ32(setclientid->se_callback_ident);
1148
1149         DECODE_TAIL;
1150 }
1151
1152 static __be32
1153 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1154 {
1155         DECODE_HEAD;
1156
1157         if (argp->minorversion >= 1)
1158                 return nfserr_notsupp;
1159
1160         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1161         COPYMEM(&scd_c->sc_clientid, 8);
1162         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1163
1164         DECODE_TAIL;
1165 }
1166
1167 /* Also used for NVERIFY */
1168 static __be32
1169 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1170 {
1171         DECODE_HEAD;
1172
1173         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1174                 goto out;
1175
1176         /* For convenience's sake, we compare raw xdr'd attributes in
1177          * nfsd4_proc_verify */
1178
1179         READ_BUF(4);
1180         READ32(verify->ve_attrlen);
1181         READ_BUF(verify->ve_attrlen);
1182         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1183
1184         DECODE_TAIL;
1185 }
1186
1187 static __be32
1188 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1189 {
1190         int avail;
1191         int len;
1192         DECODE_HEAD;
1193
1194         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1195         if (status)
1196                 return status;
1197         READ_BUF(16);
1198         READ64(write->wr_offset);
1199         READ32(write->wr_stable_how);
1200         if (write->wr_stable_how > 2)
1201                 goto xdr_error;
1202         READ32(write->wr_buflen);
1203
1204         /* Sorry .. no magic macros for this.. *
1205          * READ_BUF(write->wr_buflen);
1206          * SAVEMEM(write->wr_buf, write->wr_buflen);
1207          */
1208         avail = (char*)argp->end - (char*)argp->p;
1209         if (avail + argp->pagelen < write->wr_buflen) {
1210                 dprintk("NFSD: xdr error (%s:%d)\n",
1211                                 __FILE__, __LINE__);
1212                 goto xdr_error;
1213         }
1214         write->wr_head.iov_base = p;
1215         write->wr_head.iov_len = avail;
1216         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1217         write->wr_pagelist = argp->pagelist;
1218
1219         len = XDR_QUADLEN(write->wr_buflen) << 2;
1220         if (len >= avail) {
1221                 int pages;
1222
1223                 len -= avail;
1224
1225                 pages = len >> PAGE_SHIFT;
1226                 argp->pagelist += pages;
1227                 argp->pagelen -= pages * PAGE_SIZE;
1228                 len -= pages * PAGE_SIZE;
1229
1230                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1231                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1232         }
1233         argp->p += XDR_QUADLEN(len);
1234
1235         DECODE_TAIL;
1236 }
1237
1238 static __be32
1239 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1240 {
1241         DECODE_HEAD;
1242
1243         if (argp->minorversion >= 1)
1244                 return nfserr_notsupp;
1245
1246         READ_BUF(12);
1247         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1248         READ32(rlockowner->rl_owner.len);
1249         READ_BUF(rlockowner->rl_owner.len);
1250         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1251
1252         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1253                 return nfserr_inval;
1254         DECODE_TAIL;
1255 }
1256
1257 static __be32
1258 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1259                          struct nfsd4_exchange_id *exid)
1260 {
1261         int dummy, tmp;
1262         DECODE_HEAD;
1263
1264         READ_BUF(NFS4_VERIFIER_SIZE);
1265         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1266
1267         status = nfsd4_decode_opaque(argp, &exid->clname);
1268         if (status)
1269                 return nfserr_bad_xdr;
1270
1271         READ_BUF(4);
1272         READ32(exid->flags);
1273
1274         /* Ignore state_protect4_a */
1275         READ_BUF(4);
1276         READ32(exid->spa_how);
1277         switch (exid->spa_how) {
1278         case SP4_NONE:
1279                 break;
1280         case SP4_MACH_CRED:
1281                 /* spo_must_enforce */
1282                 READ_BUF(4);
1283                 READ32(dummy);
1284                 READ_BUF(dummy * 4);
1285                 p += dummy;
1286
1287                 /* spo_must_allow */
1288                 READ_BUF(4);
1289                 READ32(dummy);
1290                 READ_BUF(dummy * 4);
1291                 p += dummy;
1292                 break;
1293         case SP4_SSV:
1294                 /* ssp_ops */
1295                 READ_BUF(4);
1296                 READ32(dummy);
1297                 READ_BUF(dummy * 4);
1298                 p += dummy;
1299
1300                 READ_BUF(4);
1301                 READ32(dummy);
1302                 READ_BUF(dummy * 4);
1303                 p += dummy;
1304
1305                 /* ssp_hash_algs<> */
1306                 READ_BUF(4);
1307                 READ32(tmp);
1308                 while (tmp--) {
1309                         READ_BUF(4);
1310                         READ32(dummy);
1311                         READ_BUF(dummy);
1312                         p += XDR_QUADLEN(dummy);
1313                 }
1314
1315                 /* ssp_encr_algs<> */
1316                 READ_BUF(4);
1317                 READ32(tmp);
1318                 while (tmp--) {
1319                         READ_BUF(4);
1320                         READ32(dummy);
1321                         READ_BUF(dummy);
1322                         p += XDR_QUADLEN(dummy);
1323                 }
1324
1325                 /* ssp_window and ssp_num_gss_handles */
1326                 READ_BUF(8);
1327                 READ32(dummy);
1328                 READ32(dummy);
1329                 break;
1330         default:
1331                 goto xdr_error;
1332         }
1333
1334         /* Ignore Implementation ID */
1335         READ_BUF(4);    /* nfs_impl_id4 array length */
1336         READ32(dummy);
1337
1338         if (dummy > 1)
1339                 goto xdr_error;
1340
1341         if (dummy == 1) {
1342                 /* nii_domain */
1343                 READ_BUF(4);
1344                 READ32(dummy);
1345                 READ_BUF(dummy);
1346                 p += XDR_QUADLEN(dummy);
1347
1348                 /* nii_name */
1349                 READ_BUF(4);
1350                 READ32(dummy);
1351                 READ_BUF(dummy);
1352                 p += XDR_QUADLEN(dummy);
1353
1354                 /* nii_date */
1355                 READ_BUF(12);
1356                 p += 3;
1357         }
1358         DECODE_TAIL;
1359 }
1360
1361 static __be32
1362 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1363                             struct nfsd4_create_session *sess)
1364 {
1365         DECODE_HEAD;
1366         u32 dummy;
1367
1368         READ_BUF(16);
1369         COPYMEM(&sess->clientid, 8);
1370         READ32(sess->seqid);
1371         READ32(sess->flags);
1372
1373         /* Fore channel attrs */
1374         READ_BUF(28);
1375         READ32(dummy); /* headerpadsz is always 0 */
1376         READ32(sess->fore_channel.maxreq_sz);
1377         READ32(sess->fore_channel.maxresp_sz);
1378         READ32(sess->fore_channel.maxresp_cached);
1379         READ32(sess->fore_channel.maxops);
1380         READ32(sess->fore_channel.maxreqs);
1381         READ32(sess->fore_channel.nr_rdma_attrs);
1382         if (sess->fore_channel.nr_rdma_attrs == 1) {
1383                 READ_BUF(4);
1384                 READ32(sess->fore_channel.rdma_attrs);
1385         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1386                 dprintk("Too many fore channel attr bitmaps!\n");
1387                 goto xdr_error;
1388         }
1389
1390         /* Back channel attrs */
1391         READ_BUF(28);
1392         READ32(dummy); /* headerpadsz is always 0 */
1393         READ32(sess->back_channel.maxreq_sz);
1394         READ32(sess->back_channel.maxresp_sz);
1395         READ32(sess->back_channel.maxresp_cached);
1396         READ32(sess->back_channel.maxops);
1397         READ32(sess->back_channel.maxreqs);
1398         READ32(sess->back_channel.nr_rdma_attrs);
1399         if (sess->back_channel.nr_rdma_attrs == 1) {
1400                 READ_BUF(4);
1401                 READ32(sess->back_channel.rdma_attrs);
1402         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1403                 dprintk("Too many back channel attr bitmaps!\n");
1404                 goto xdr_error;
1405         }
1406
1407         READ_BUF(4);
1408         READ32(sess->callback_prog);
1409         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1410         DECODE_TAIL;
1411 }
1412
1413 static __be32
1414 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1415                              struct nfsd4_destroy_session *destroy_session)
1416 {
1417         DECODE_HEAD;
1418         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1419         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1420
1421         DECODE_TAIL;
1422 }
1423
1424 static __be32
1425 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1426                           struct nfsd4_free_stateid *free_stateid)
1427 {
1428         DECODE_HEAD;
1429
1430         READ_BUF(sizeof(stateid_t));
1431         READ32(free_stateid->fr_stateid.si_generation);
1432         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1433
1434         DECODE_TAIL;
1435 }
1436
1437 static __be32
1438 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1439                       struct nfsd4_sequence *seq)
1440 {
1441         DECODE_HEAD;
1442
1443         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1444         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1445         READ32(seq->seqid);
1446         READ32(seq->slotid);
1447         READ32(seq->maxslots);
1448         READ32(seq->cachethis);
1449
1450         DECODE_TAIL;
1451 }
1452
1453 static __be32
1454 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1455 {
1456         int i;
1457         __be32 *p, status;
1458         struct nfsd4_test_stateid_id *stateid;
1459
1460         READ_BUF(4);
1461         test_stateid->ts_num_ids = ntohl(*p++);
1462
1463         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1464
1465         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1466                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1467                 if (!stateid) {
1468                         status = nfserrno(-ENOMEM);
1469                         goto out;
1470                 }
1471
1472                 defer_free(argp, kfree, stateid);
1473                 INIT_LIST_HEAD(&stateid->ts_id_list);
1474                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1475
1476                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1477                 if (status)
1478                         goto out;
1479         }
1480
1481         status = 0;
1482 out:
1483         return status;
1484 xdr_error:
1485         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1486         status = nfserr_bad_xdr;
1487         goto out;
1488 }
1489
1490 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1491 {
1492         DECODE_HEAD;
1493
1494         READ_BUF(8);
1495         COPYMEM(&dc->clientid, 8);
1496
1497         DECODE_TAIL;
1498 }
1499
1500 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1501 {
1502         DECODE_HEAD;
1503
1504         READ_BUF(4);
1505         READ32(rc->rca_one_fs);
1506
1507         DECODE_TAIL;
1508 }
1509
1510 static __be32
1511 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1512 {
1513         return nfs_ok;
1514 }
1515
1516 static __be32
1517 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1518 {
1519         return nfserr_notsupp;
1520 }
1521
1522 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1523
1524 static nfsd4_dec nfsd4_dec_ops[] = {
1525         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1526         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1527         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1528         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1529         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1530         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1531         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1532         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1533         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1534         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1535         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1536         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1537         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1538         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1539         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1540         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1541         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1542         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1543         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1544         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1545         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1546         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1547         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1548         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1549         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1550         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1551         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1552         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1553         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1554         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1555         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1556         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1557         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1558         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1559         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1560         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1561         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1562
1563         /* new operations for NFSv4.1 */
1564         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1565         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1566         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1567         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1568         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1569         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1570         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1571         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1572         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1573         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1574         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1575         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1576         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1577         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1578         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1579         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1580         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1582         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1583 };
1584
1585 static inline bool
1586 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1587 {
1588         if (op->opnum < FIRST_NFS4_OP || op->opnum > LAST_NFS4_OP)
1589                 return false;
1590         else if (argp->minorversion == 0 && op->opnum > OP_RELEASE_LOCKOWNER)
1591                 return false;
1592         else if (argp->minorversion == 1 && op->opnum > OP_RECLAIM_COMPLETE)
1593                 return false;
1594         return true;
1595 }
1596
1597 static __be32
1598 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1599 {
1600         DECODE_HEAD;
1601         struct nfsd4_op *op;
1602         bool cachethis = false;
1603         int i;
1604
1605         READ_BUF(4);
1606         READ32(argp->taglen);
1607         READ_BUF(argp->taglen + 8);
1608         SAVEMEM(argp->tag, argp->taglen);
1609         READ32(argp->minorversion);
1610         READ32(argp->opcnt);
1611
1612         if (argp->taglen > NFSD4_MAX_TAGLEN)
1613                 goto xdr_error;
1614         if (argp->opcnt > 100)
1615                 goto xdr_error;
1616
1617         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1618                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1619                 if (!argp->ops) {
1620                         argp->ops = argp->iops;
1621                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1622                         goto xdr_error;
1623                 }
1624         }
1625
1626         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1627                 argp->opcnt = 0;
1628
1629         for (i = 0; i < argp->opcnt; i++) {
1630                 op = &argp->ops[i];
1631                 op->replay = NULL;
1632
1633                 READ_BUF(4);
1634                 READ32(op->opnum);
1635
1636                 if (nfsd4_opnum_in_range(argp, op))
1637                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1638                 else {
1639                         op->opnum = OP_ILLEGAL;
1640                         op->status = nfserr_op_illegal;
1641                 }
1642
1643                 if (op->status) {
1644                         argp->opcnt = i+1;
1645                         break;
1646                 }
1647                 /*
1648                  * We'll try to cache the result in the DRC if any one
1649                  * op in the compound wants to be cached:
1650                  */
1651                 cachethis |= nfsd4_cache_this_op(op);
1652         }
1653         /* Sessions make the DRC unnecessary: */
1654         if (argp->minorversion)
1655                 cachethis = false;
1656         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1657
1658         DECODE_TAIL;
1659 }
1660
1661 #define WRITE32(n)               *p++ = htonl(n)
1662 #define WRITE64(n)               do {                           \
1663         *p++ = htonl((u32)((n) >> 32));                         \
1664         *p++ = htonl((u32)(n));                                 \
1665 } while (0)
1666 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1667         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1668         memcpy(p, ptr, nbytes);                                 \
1669         p += XDR_QUADLEN(nbytes);                               \
1670 }} while (0)
1671
1672 static void write32(__be32 **p, u32 n)
1673 {
1674         *(*p)++ = htonl(n);
1675 }
1676
1677 static void write64(__be32 **p, u64 n)
1678 {
1679         write32(p, (n >> 32));
1680         write32(p, (u32)n);
1681 }
1682
1683 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1684 {
1685         if (IS_I_VERSION(inode)) {
1686                 write64(p, inode->i_version);
1687         } else {
1688                 write32(p, stat->ctime.tv_sec);
1689                 write32(p, stat->ctime.tv_nsec);
1690         }
1691 }
1692
1693 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1694 {
1695         write32(p, c->atomic);
1696         if (c->change_supported) {
1697                 write64(p, c->before_change);
1698                 write64(p, c->after_change);
1699         } else {
1700                 write32(p, c->before_ctime_sec);
1701                 write32(p, c->before_ctime_nsec);
1702                 write32(p, c->after_ctime_sec);
1703                 write32(p, c->after_ctime_nsec);
1704         }
1705 }
1706
1707 #define RESERVE_SPACE(nbytes)   do {                            \
1708         p = resp->p;                                            \
1709         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1710 } while (0)
1711 #define ADJUST_ARGS()           resp->p = p
1712
1713 /* Encode as an array of strings the string given with components
1714  * separated @sep, escaped with esc_enter and esc_exit.
1715  */
1716 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1717                                    __be32 **pp, int *buflen,
1718                                    char esc_enter, char esc_exit)
1719 {
1720         __be32 *p = *pp;
1721         __be32 *countp = p;
1722         int strlen, count=0;
1723         char *str, *end, *next;
1724
1725         dprintk("nfsd4_encode_components(%s)\n", components);
1726         if ((*buflen -= 4) < 0)
1727                 return nfserr_resource;
1728         WRITE32(0); /* We will fill this in with @count later */
1729         end = str = components;
1730         while (*end) {
1731                 bool found_esc = false;
1732
1733                 /* try to parse as esc_start, ..., esc_end, sep */
1734                 if (*str == esc_enter) {
1735                         for (; *end && (*end != esc_exit); end++)
1736                                 /* find esc_exit or end of string */;
1737                         next = end + 1;
1738                         if (*end && (!*next || *next == sep)) {
1739                                 str++;
1740                                 found_esc = true;
1741                         }
1742                 }
1743
1744                 if (!found_esc)
1745                         for (; *end && (*end != sep); end++)
1746                                 /* find sep or end of string */;
1747
1748                 strlen = end - str;
1749                 if (strlen) {
1750                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1751                                 return nfserr_resource;
1752                         WRITE32(strlen);
1753                         WRITEMEM(str, strlen);
1754                         count++;
1755                 }
1756                 else
1757                         end++;
1758                 str = end;
1759         }
1760         *pp = p;
1761         p = countp;
1762         WRITE32(count);
1763         return 0;
1764 }
1765
1766 /* Encode as an array of strings the string given with components
1767  * separated @sep.
1768  */
1769 static __be32 nfsd4_encode_components(char sep, char *components,
1770                                    __be32 **pp, int *buflen)
1771 {
1772         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1773 }
1774
1775 /*
1776  * encode a location element of a fs_locations structure
1777  */
1778 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1779                                     __be32 **pp, int *buflen)
1780 {
1781         __be32 status;
1782         __be32 *p = *pp;
1783
1784         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1785                                                 '[', ']');
1786         if (status)
1787                 return status;
1788         status = nfsd4_encode_components('/', location->path, &p, buflen);
1789         if (status)
1790                 return status;
1791         *pp = p;
1792         return 0;
1793 }
1794
1795 /*
1796  * Encode a path in RFC3530 'pathname4' format
1797  */
1798 static __be32 nfsd4_encode_path(const struct path *root,
1799                 const struct path *path, __be32 **pp, int *buflen)
1800 {
1801         struct path cur = *path;
1802         __be32 *p = *pp;
1803         struct dentry **components = NULL;
1804         unsigned int ncomponents = 0;
1805         __be32 err = nfserr_jukebox;
1806
1807         dprintk("nfsd4_encode_components(");
1808
1809         path_get(&cur);
1810         /* First walk the path up to the nfsd root, and store the
1811          * dentries/path components in an array.
1812          */
1813         for (;;) {
1814                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1815                         break;
1816                 if (cur.dentry == cur.mnt->mnt_root) {
1817                         if (follow_up(&cur))
1818                                 continue;
1819                         goto out_free;
1820                 }
1821                 if ((ncomponents & 15) == 0) {
1822                         struct dentry **new;
1823                         new = krealloc(components,
1824                                         sizeof(*new) * (ncomponents + 16),
1825                                         GFP_KERNEL);
1826                         if (!new)
1827                                 goto out_free;
1828                         components = new;
1829                 }
1830                 components[ncomponents++] = cur.dentry;
1831                 cur.dentry = dget_parent(cur.dentry);
1832         }
1833
1834         *buflen -= 4;
1835         if (*buflen < 0)
1836                 goto out_free;
1837         WRITE32(ncomponents);
1838
1839         while (ncomponents) {
1840                 struct dentry *dentry = components[ncomponents - 1];
1841                 unsigned int len;
1842
1843                 spin_lock(&dentry->d_lock);
1844                 len = dentry->d_name.len;
1845                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1846                 if (*buflen < 0) {
1847                         spin_unlock(&dentry->d_lock);
1848                         goto out_free;
1849                 }
1850                 WRITE32(len);
1851                 WRITEMEM(dentry->d_name.name, len);
1852                 dprintk("/%s", dentry->d_name.name);
1853                 spin_unlock(&dentry->d_lock);
1854                 dput(dentry);
1855                 ncomponents--;
1856         }
1857
1858         *pp = p;
1859         err = 0;
1860 out_free:
1861         dprintk(")\n");
1862         while (ncomponents)
1863                 dput(components[--ncomponents]);
1864         kfree(components);
1865         path_put(&cur);
1866         return err;
1867 }
1868
1869 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1870                 const struct path *path, __be32 **pp, int *buflen)
1871 {
1872         struct svc_export *exp_ps;
1873         __be32 res;
1874
1875         exp_ps = rqst_find_fsidzero_export(rqstp);
1876         if (IS_ERR(exp_ps))
1877                 return nfserrno(PTR_ERR(exp_ps));
1878         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1879         exp_put(exp_ps);
1880         return res;
1881 }
1882
1883 /*
1884  *  encode a fs_locations structure
1885  */
1886 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1887                                      struct svc_export *exp,
1888                                      __be32 **pp, int *buflen)
1889 {
1890         __be32 status;
1891         int i;
1892         __be32 *p = *pp;
1893         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1894
1895         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1896         if (status)
1897                 return status;
1898         if ((*buflen -= 4) < 0)
1899                 return nfserr_resource;
1900         WRITE32(fslocs->locations_count);
1901         for (i=0; i<fslocs->locations_count; i++) {
1902                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1903                                                    &p, buflen);
1904                 if (status)
1905                         return status;
1906         }
1907         *pp = p;
1908         return 0;
1909 }
1910
1911 static u32 nfs4_file_type(umode_t mode)
1912 {
1913         switch (mode & S_IFMT) {
1914         case S_IFIFO:   return NF4FIFO;
1915         case S_IFCHR:   return NF4CHR;
1916         case S_IFDIR:   return NF4DIR;
1917         case S_IFBLK:   return NF4BLK;
1918         case S_IFLNK:   return NF4LNK;
1919         case S_IFREG:   return NF4REG;
1920         case S_IFSOCK:  return NF4SOCK;
1921         default:        return NF4BAD;
1922         };
1923 }
1924
1925 static __be32
1926 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1927                         __be32 **p, int *buflen)
1928 {
1929         int status;
1930
1931         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1932                 return nfserr_resource;
1933         if (whotype != NFS4_ACL_WHO_NAMED)
1934                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1935         else if (gid_valid(gid))
1936                 status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1937         else
1938                 status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1939         if (status < 0)
1940                 return nfserrno(status);
1941         *p = xdr_encode_opaque(*p, NULL, status);
1942         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1943         BUG_ON(*buflen < 0);
1944         return 0;
1945 }
1946
1947 static inline __be32
1948 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1949 {
1950         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1951                                  p, buflen);
1952 }
1953
1954 static inline __be32
1955 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1956 {
1957         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
1958                                  p, buflen);
1959 }
1960
1961 static inline __be32
1962 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1963                 __be32 **p, int *buflen)
1964 {
1965         kuid_t uid = INVALID_UID;
1966         kgid_t gid = INVALID_GID;
1967
1968         if (ace->whotype == NFS4_ACL_WHO_NAMED) {
1969                 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1970                         gid = ace->who_gid;
1971                 else
1972                         uid = ace->who_uid;
1973         }
1974         return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
1975 }
1976
1977 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1978                               FATTR4_WORD0_RDATTR_ERROR)
1979 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1980
1981 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1982 static inline __be32
1983 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
1984 {
1985         __be32 *p = *pp;
1986
1987         if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4))
1988                 return nfserr_resource;
1989
1990         /*
1991          * For now we use a 0 here to indicate the null translation; in
1992          * the future we may place a call to translation code here.
1993          */
1994         if ((*buflen -= 8) < 0)
1995                 return nfserr_resource;
1996
1997         WRITE32(0); /* lfs */
1998         WRITE32(0); /* pi */
1999         p = xdr_encode_opaque(p, context, len);
2000         *buflen -= (XDR_QUADLEN(len) << 2) + 4;
2001
2002         *pp = p;
2003         return 0;
2004 }
2005 #else
2006 static inline __be32
2007 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2008 { return 0; }
2009 #endif
2010
2011 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2012 {
2013         /* As per referral draft:  */
2014         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2015             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2016                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2017                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2018                         *rdattr_err = NFSERR_MOVED;
2019                 else
2020                         return nfserr_moved;
2021         }
2022         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2023         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2024         return 0;
2025 }
2026
2027
2028 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2029 {
2030         struct path path = exp->ex_path;
2031         int err;
2032
2033         path_get(&path);
2034         while (follow_up(&path)) {
2035                 if (path.dentry != path.mnt->mnt_root)
2036                         break;
2037         }
2038         err = vfs_getattr(&path, stat);
2039         path_put(&path);
2040         return err;
2041 }
2042
2043 /*
2044  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2045  * ourselves.
2046  *
2047  * countp is the buffer size in _words_
2048  */
2049 __be32
2050 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2051                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
2052                 struct svc_rqst *rqstp, int ignore_crossmnt)
2053 {
2054         u32 bmval0 = bmval[0];
2055         u32 bmval1 = bmval[1];
2056         u32 bmval2 = bmval[2];
2057         struct kstat stat;
2058         struct svc_fh tempfh;
2059         struct kstatfs statfs;
2060         int buflen = count << 2;
2061         __be32 *attrlenp;
2062         u32 dummy;
2063         u64 dummy64;
2064         u32 rdattr_err = 0;
2065         __be32 *p = *buffer;
2066         __be32 status;
2067         int err;
2068         int aclsupport = 0;
2069         struct nfs4_acl *acl = NULL;
2070         void *context = NULL;
2071         int contextlen;
2072         bool contextsupport = false;
2073         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2074         u32 minorversion = resp->cstate.minorversion;
2075         struct path path = {
2076                 .mnt    = exp->ex_path.mnt,
2077                 .dentry = dentry,
2078         };
2079         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2080
2081         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2082         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2083         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2084         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2085
2086         if (exp->ex_fslocs.migrated) {
2087                 BUG_ON(bmval[2]);
2088                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2089                 if (status)
2090                         goto out;
2091         }
2092
2093         err = vfs_getattr(&path, &stat);
2094         if (err)
2095                 goto out_nfserr;
2096         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2097                         FATTR4_WORD0_MAXNAME)) ||
2098             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2099                        FATTR4_WORD1_SPACE_TOTAL))) {
2100                 err = vfs_statfs(&path, &statfs);
2101                 if (err)
2102                         goto out_nfserr;
2103         }
2104         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2105                 fh_init(&tempfh, NFS4_FHSIZE);
2106                 status = fh_compose(&tempfh, exp, dentry, NULL);
2107                 if (status)
2108                         goto out;
2109                 fhp = &tempfh;
2110         }
2111         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2112                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2113                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2114                 aclsupport = (err == 0);
2115                 if (bmval0 & FATTR4_WORD0_ACL) {
2116                         if (err == -EOPNOTSUPP)
2117                                 bmval0 &= ~FATTR4_WORD0_ACL;
2118                         else if (err == -EINVAL) {
2119                                 status = nfserr_attrnotsupp;
2120                                 goto out;
2121                         } else if (err != 0)
2122                                 goto out_nfserr;
2123                 }
2124         }
2125
2126 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2127         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2128                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2129                 err = security_inode_getsecctx(dentry->d_inode,
2130                                                 &context, &contextlen);
2131                 contextsupport = (err == 0);
2132                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2133                         if (err == -EOPNOTSUPP)
2134                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2135                         else if (err)
2136                                 goto out_nfserr;
2137                 }
2138         }
2139 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2140
2141         if (bmval2) {
2142                 if ((buflen -= 16) < 0)
2143                         goto out_resource;
2144                 WRITE32(3);
2145                 WRITE32(bmval0);
2146                 WRITE32(bmval1);
2147                 WRITE32(bmval2);
2148         } else if (bmval1) {
2149                 if ((buflen -= 12) < 0)
2150                         goto out_resource;
2151                 WRITE32(2);
2152                 WRITE32(bmval0);
2153                 WRITE32(bmval1);
2154         } else {
2155                 if ((buflen -= 8) < 0)
2156                         goto out_resource;
2157                 WRITE32(1);
2158                 WRITE32(bmval0);
2159         }
2160         attrlenp = p++;                /* to be backfilled later */
2161
2162         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2163                 u32 word0 = nfsd_suppattrs0(minorversion);
2164                 u32 word1 = nfsd_suppattrs1(minorversion);
2165                 u32 word2 = nfsd_suppattrs2(minorversion);
2166
2167                 if (!aclsupport)
2168                         word0 &= ~FATTR4_WORD0_ACL;
2169                 if (!contextsupport)
2170                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2171                 if (!word2) {
2172                         if ((buflen -= 12) < 0)
2173                                 goto out_resource;
2174                         WRITE32(2);
2175                         WRITE32(word0);
2176                         WRITE32(word1);
2177                 } else {
2178                         if ((buflen -= 16) < 0)
2179                                 goto out_resource;
2180                         WRITE32(3);
2181                         WRITE32(word0);
2182                         WRITE32(word1);
2183                         WRITE32(word2);
2184                 }
2185         }
2186         if (bmval0 & FATTR4_WORD0_TYPE) {
2187                 if ((buflen -= 4) < 0)
2188                         goto out_resource;
2189                 dummy = nfs4_file_type(stat.mode);
2190                 if (dummy == NF4BAD)
2191                         goto out_serverfault;
2192                 WRITE32(dummy);
2193         }
2194         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2195                 if ((buflen -= 4) < 0)
2196                         goto out_resource;
2197                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2198                         WRITE32(NFS4_FH_PERSISTENT);
2199                 else
2200                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2201         }
2202         if (bmval0 & FATTR4_WORD0_CHANGE) {
2203                 if ((buflen -= 8) < 0)
2204                         goto out_resource;
2205                 write_change(&p, &stat, dentry->d_inode);
2206         }
2207         if (bmval0 & FATTR4_WORD0_SIZE) {
2208                 if ((buflen -= 8) < 0)
2209                         goto out_resource;
2210                 WRITE64(stat.size);
2211         }
2212         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2213                 if ((buflen -= 4) < 0)
2214                         goto out_resource;
2215                 WRITE32(1);
2216         }
2217         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2218                 if ((buflen -= 4) < 0)
2219                         goto out_resource;
2220                 WRITE32(1);
2221         }
2222         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2223                 if ((buflen -= 4) < 0)
2224                         goto out_resource;
2225                 WRITE32(0);
2226         }
2227         if (bmval0 & FATTR4_WORD0_FSID) {
2228                 if ((buflen -= 16) < 0)
2229                         goto out_resource;
2230                 if (exp->ex_fslocs.migrated) {
2231                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2232                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2233                 } else switch(fsid_source(fhp)) {
2234                 case FSIDSOURCE_FSID:
2235                         WRITE64((u64)exp->ex_fsid);
2236                         WRITE64((u64)0);
2237                         break;
2238                 case FSIDSOURCE_DEV:
2239                         WRITE32(0);
2240                         WRITE32(MAJOR(stat.dev));
2241                         WRITE32(0);
2242                         WRITE32(MINOR(stat.dev));
2243                         break;
2244                 case FSIDSOURCE_UUID:
2245                         WRITEMEM(exp->ex_uuid, 16);
2246                         break;
2247                 }
2248         }
2249         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2250                 if ((buflen -= 4) < 0)
2251                         goto out_resource;
2252                 WRITE32(0);
2253         }
2254         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2255                 if ((buflen -= 4) < 0)
2256                         goto out_resource;
2257                 WRITE32(nn->nfsd4_lease);
2258         }
2259         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2260                 if ((buflen -= 4) < 0)
2261                         goto out_resource;
2262                 WRITE32(rdattr_err);
2263         }
2264         if (bmval0 & FATTR4_WORD0_ACL) {
2265                 struct nfs4_ace *ace;
2266
2267                 if (acl == NULL) {
2268                         if ((buflen -= 4) < 0)
2269                                 goto out_resource;
2270
2271                         WRITE32(0);
2272                         goto out_acl;
2273                 }
2274                 if ((buflen -= 4) < 0)
2275                         goto out_resource;
2276                 WRITE32(acl->naces);
2277
2278                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2279                         if ((buflen -= 4*3) < 0)
2280                                 goto out_resource;
2281                         WRITE32(ace->type);
2282                         WRITE32(ace->flag);
2283                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2284                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2285                         if (status == nfserr_resource)
2286                                 goto out_resource;
2287                         if (status)
2288                                 goto out;
2289                 }
2290         }
2291 out_acl:
2292         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2293                 if ((buflen -= 4) < 0)
2294                         goto out_resource;
2295                 WRITE32(aclsupport ?
2296                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2297         }
2298         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2299                 if ((buflen -= 4) < 0)
2300                         goto out_resource;
2301                 WRITE32(1);
2302         }
2303         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2304                 if ((buflen -= 4) < 0)
2305                         goto out_resource;
2306                 WRITE32(0);
2307         }
2308         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2309                 if ((buflen -= 4) < 0)
2310                         goto out_resource;
2311                 WRITE32(1);
2312         }
2313         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2314                 if ((buflen -= 4) < 0)
2315                         goto out_resource;
2316                 WRITE32(1);
2317         }
2318         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2319                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2320                 if (buflen < 0)
2321                         goto out_resource;
2322                 WRITE32(fhp->fh_handle.fh_size);
2323                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2324         }
2325         if (bmval0 & FATTR4_WORD0_FILEID) {
2326                 if ((buflen -= 8) < 0)
2327                         goto out_resource;
2328                 WRITE64(stat.ino);
2329         }
2330         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2331                 if ((buflen -= 8) < 0)
2332                         goto out_resource;
2333                 WRITE64((u64) statfs.f_ffree);
2334         }
2335         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2336                 if ((buflen -= 8) < 0)
2337                         goto out_resource;
2338                 WRITE64((u64) statfs.f_ffree);
2339         }
2340         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2341                 if ((buflen -= 8) < 0)
2342                         goto out_resource;
2343                 WRITE64((u64) statfs.f_files);
2344         }
2345         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2346                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2347                 if (status == nfserr_resource)
2348                         goto out_resource;
2349                 if (status)
2350                         goto out;
2351         }
2352         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2353                 if ((buflen -= 4) < 0)
2354                         goto out_resource;
2355                 WRITE32(1);
2356         }
2357         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2358                 if ((buflen -= 8) < 0)
2359                         goto out_resource;
2360                 WRITE64(~(u64)0);
2361         }
2362         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2363                 if ((buflen -= 4) < 0)
2364                         goto out_resource;
2365                 WRITE32(255);
2366         }
2367         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2368                 if ((buflen -= 4) < 0)
2369                         goto out_resource;
2370                 WRITE32(statfs.f_namelen);
2371         }
2372         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2373                 if ((buflen -= 8) < 0)
2374                         goto out_resource;
2375                 WRITE64((u64) svc_max_payload(rqstp));
2376         }
2377         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2378                 if ((buflen -= 8) < 0)
2379                         goto out_resource;
2380                 WRITE64((u64) svc_max_payload(rqstp));
2381         }
2382         if (bmval1 & FATTR4_WORD1_MODE) {
2383                 if ((buflen -= 4) < 0)
2384                         goto out_resource;
2385                 WRITE32(stat.mode & S_IALLUGO);
2386         }
2387         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2388                 if ((buflen -= 4) < 0)
2389                         goto out_resource;
2390                 WRITE32(1);
2391         }
2392         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2393                 if ((buflen -= 4) < 0)
2394                         goto out_resource;
2395                 WRITE32(stat.nlink);
2396         }
2397         if (bmval1 & FATTR4_WORD1_OWNER) {
2398                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2399                 if (status == nfserr_resource)
2400                         goto out_resource;
2401                 if (status)
2402                         goto out;
2403         }
2404         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2405                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2406                 if (status == nfserr_resource)
2407                         goto out_resource;
2408                 if (status)
2409                         goto out;
2410         }
2411         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2412                 if ((buflen -= 8) < 0)
2413                         goto out_resource;
2414                 WRITE32((u32) MAJOR(stat.rdev));
2415                 WRITE32((u32) MINOR(stat.rdev));
2416         }
2417         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2418                 if ((buflen -= 8) < 0)
2419                         goto out_resource;
2420                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2421                 WRITE64(dummy64);
2422         }
2423         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2424                 if ((buflen -= 8) < 0)
2425                         goto out_resource;
2426                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2427                 WRITE64(dummy64);
2428         }
2429         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2430                 if ((buflen -= 8) < 0)
2431                         goto out_resource;
2432                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2433                 WRITE64(dummy64);
2434         }
2435         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2436                 if ((buflen -= 8) < 0)
2437                         goto out_resource;
2438                 dummy64 = (u64)stat.blocks << 9;
2439                 WRITE64(dummy64);
2440         }
2441         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2442                 if ((buflen -= 12) < 0)
2443                         goto out_resource;
2444                 WRITE64((s64)stat.atime.tv_sec);
2445                 WRITE32(stat.atime.tv_nsec);
2446         }
2447         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2448                 if ((buflen -= 12) < 0)
2449                         goto out_resource;
2450                 WRITE32(0);
2451                 WRITE32(1);
2452                 WRITE32(0);
2453         }
2454         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2455                 if ((buflen -= 12) < 0)
2456                         goto out_resource;
2457                 WRITE64((s64)stat.ctime.tv_sec);
2458                 WRITE32(stat.ctime.tv_nsec);
2459         }
2460         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2461                 if ((buflen -= 12) < 0)
2462                         goto out_resource;
2463                 WRITE64((s64)stat.mtime.tv_sec);
2464                 WRITE32(stat.mtime.tv_nsec);
2465         }
2466         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2467                 if ((buflen -= 8) < 0)
2468                         goto out_resource;
2469                 /*
2470                  * Get parent's attributes if not ignoring crossmount
2471                  * and this is the root of a cross-mounted filesystem.
2472                  */
2473                 if (ignore_crossmnt == 0 &&
2474                     dentry == exp->ex_path.mnt->mnt_root)
2475                         get_parent_attributes(exp, &stat);
2476                 WRITE64(stat.ino);
2477         }
2478         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2479                 status = nfsd4_encode_security_label(rqstp, context,
2480                                 contextlen, &p, &buflen);
2481                 if (status)
2482                         goto out;
2483         }
2484         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2485                 WRITE32(3);
2486                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2487                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2488                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2489         }
2490
2491         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2492         *buffer = p;
2493         status = nfs_ok;
2494
2495 out:
2496 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2497         if (context)
2498                 security_release_secctx(context, contextlen);
2499 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2500         kfree(acl);
2501         if (fhp == &tempfh)
2502                 fh_put(&tempfh);
2503         return status;
2504 out_nfserr:
2505         status = nfserrno(err);
2506         goto out;
2507 out_resource:
2508         status = nfserr_resource;
2509         goto out;
2510 out_serverfault:
2511         status = nfserr_serverfault;
2512         goto out;
2513 }
2514
2515 static inline int attributes_need_mount(u32 *bmval)
2516 {
2517         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2518                 return 1;
2519         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2520                 return 1;
2521         return 0;
2522 }
2523
2524 static __be32
2525 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2526                 const char *name, int namlen, __be32 **p, int buflen)
2527 {
2528         struct svc_export *exp = cd->rd_fhp->fh_export;
2529         struct dentry *dentry;
2530         __be32 nfserr;
2531         int ignore_crossmnt = 0;
2532
2533         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2534         if (IS_ERR(dentry))
2535                 return nfserrno(PTR_ERR(dentry));
2536         if (!dentry->d_inode) {
2537                 /*
2538                  * nfsd_buffered_readdir drops the i_mutex between
2539                  * readdir and calling this callback, leaving a window
2540                  * where this directory entry could have gone away.
2541                  */
2542                 dput(dentry);
2543                 return nfserr_noent;
2544         }
2545
2546         exp_get(exp);
2547         /*
2548          * In the case of a mountpoint, the client may be asking for
2549          * attributes that are only properties of the underlying filesystem
2550          * as opposed to the cross-mounted file system. In such a case,
2551          * we will not follow the cross mount and will fill the attribtutes
2552          * directly from the mountpoint dentry.
2553          */
2554         if (nfsd_mountpoint(dentry, exp)) {
2555                 int err;
2556
2557                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2558                                 && !attributes_need_mount(cd->rd_bmval)) {
2559                         ignore_crossmnt = 1;
2560                         goto out_encode;
2561                 }
2562                 /*
2563                  * Why the heck aren't we just using nfsd_lookup??
2564                  * Different "."/".." handling?  Something else?
2565                  * At least, add a comment here to explain....
2566                  */
2567                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2568                 if (err) {
2569                         nfserr = nfserrno(err);
2570                         goto out_put;
2571                 }
2572                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2573                 if (nfserr)
2574                         goto out_put;
2575
2576         }
2577 out_encode:
2578         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2579                                         cd->rd_rqstp, ignore_crossmnt);
2580 out_put:
2581         dput(dentry);
2582         exp_put(exp);
2583         return nfserr;
2584 }
2585
2586 static __be32 *
2587 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2588 {
2589         __be32 *attrlenp;
2590
2591         if (buflen < 6)
2592                 return NULL;
2593         *p++ = htonl(2);
2594         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2595         *p++ = htonl(0);                         /* bmval1 */
2596
2597         attrlenp = p++;
2598         *p++ = nfserr;       /* no htonl */
2599         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2600         return p;
2601 }
2602
2603 static int
2604 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2605                     loff_t offset, u64 ino, unsigned int d_type)
2606 {
2607         struct readdir_cd *ccd = ccdv;
2608         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2609         int buflen;
2610         __be32 *p = cd->buffer;
2611         __be32 *cookiep;
2612         __be32 nfserr = nfserr_toosmall;
2613
2614         /* In nfsv4, "." and ".." never make it onto the wire.. */
2615         if (name && isdotent(name, namlen)) {
2616                 cd->common.err = nfs_ok;
2617                 return 0;
2618         }
2619
2620         if (cd->offset)
2621                 xdr_encode_hyper(cd->offset, (u64) offset);
2622
2623         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2624         if (buflen < 0)
2625                 goto fail;
2626
2627         *p++ = xdr_one;                             /* mark entry present */
2628         cookiep = p;
2629         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2630         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2631
2632         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2633         switch (nfserr) {
2634         case nfs_ok:
2635                 break;
2636         case nfserr_resource:
2637                 nfserr = nfserr_toosmall;
2638                 goto fail;
2639         case nfserr_noent:
2640                 goto skip_entry;
2641         default:
2642                 /*
2643                  * If the client requested the RDATTR_ERROR attribute,
2644                  * we stuff the error code into this attribute
2645                  * and continue.  If this attribute was not requested,
2646                  * then in accordance with the spec, we fail the
2647                  * entire READDIR operation(!)
2648                  */
2649                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2650                         goto fail;
2651                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2652                 if (p == NULL) {
2653                         nfserr = nfserr_toosmall;
2654                         goto fail;
2655                 }
2656         }
2657         cd->buflen -= (p - cd->buffer);
2658         cd->buffer = p;
2659         cd->offset = cookiep;
2660 skip_entry:
2661         cd->common.err = nfs_ok;
2662         return 0;
2663 fail:
2664         cd->common.err = nfserr;
2665         return -EINVAL;
2666 }
2667
2668 static void
2669 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2670 {
2671         __be32 *p;
2672
2673         RESERVE_SPACE(sizeof(stateid_t));
2674         WRITE32(sid->si_generation);
2675         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2676         ADJUST_ARGS();
2677 }
2678
2679 static __be32
2680 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2681 {
2682         __be32 *p;
2683
2684         if (!nfserr) {
2685                 RESERVE_SPACE(8);
2686                 WRITE32(access->ac_supported);
2687                 WRITE32(access->ac_resp_access);
2688                 ADJUST_ARGS();
2689         }
2690         return nfserr;
2691 }
2692
2693 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2694 {
2695         __be32 *p;
2696
2697         if (!nfserr) {
2698                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2699                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2700                 WRITE32(bcts->dir);
2701                 /* Sorry, we do not yet support RDMA over 4.1: */
2702                 WRITE32(0);
2703                 ADJUST_ARGS();
2704         }
2705         return nfserr;
2706 }
2707
2708 static __be32
2709 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2710 {
2711         if (!nfserr)
2712                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2713
2714         return nfserr;
2715 }
2716
2717
2718 static __be32
2719 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2720 {
2721         __be32 *p;
2722
2723         if (!nfserr) {
2724                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2725                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2726                 ADJUST_ARGS();
2727         }
2728         return nfserr;
2729 }
2730
2731 static __be32
2732 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2733 {
2734         __be32 *p;
2735
2736         if (!nfserr) {
2737                 RESERVE_SPACE(32);
2738                 write_cinfo(&p, &create->cr_cinfo);
2739                 WRITE32(2);
2740                 WRITE32(create->cr_bmval[0]);
2741                 WRITE32(create->cr_bmval[1]);
2742                 ADJUST_ARGS();
2743         }
2744         return nfserr;
2745 }
2746
2747 static __be32
2748 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2749 {
2750         struct svc_fh *fhp = getattr->ga_fhp;
2751         int buflen;
2752
2753         if (nfserr)
2754                 return nfserr;
2755
2756         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2757         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2758                                     &resp->p, buflen, getattr->ga_bmval,
2759                                     resp->rqstp, 0);
2760         return nfserr;
2761 }
2762
2763 static __be32
2764 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2765 {
2766         struct svc_fh *fhp = *fhpp;
2767         unsigned int len;
2768         __be32 *p;
2769
2770         if (!nfserr) {
2771                 len = fhp->fh_handle.fh_size;
2772                 RESERVE_SPACE(len + 4);
2773                 WRITE32(len);
2774                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2775                 ADJUST_ARGS();
2776         }
2777         return nfserr;
2778 }
2779
2780 /*
2781 * Including all fields other than the name, a LOCK4denied structure requires
2782 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2783 */
2784 static void
2785 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2786 {
2787         struct xdr_netobj *conf = &ld->ld_owner;
2788         __be32 *p;
2789
2790         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2791         WRITE64(ld->ld_start);
2792         WRITE64(ld->ld_length);
2793         WRITE32(ld->ld_type);
2794         if (conf->len) {
2795                 WRITEMEM(&ld->ld_clientid, 8);
2796                 WRITE32(conf->len);
2797                 WRITEMEM(conf->data, conf->len);
2798                 kfree(conf->data);
2799         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2800                 WRITE64((u64)0); /* clientid */
2801                 WRITE32(0); /* length of owner name */
2802         }
2803         ADJUST_ARGS();
2804 }
2805
2806 static __be32
2807 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2808 {
2809         if (!nfserr)
2810                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2811         else if (nfserr == nfserr_denied)
2812                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2813
2814         return nfserr;
2815 }
2816
2817 static __be32
2818 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2819 {
2820         if (nfserr == nfserr_denied)
2821                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2822         return nfserr;
2823 }
2824
2825 static __be32
2826 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2827 {
2828         if (!nfserr)
2829                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2830
2831         return nfserr;
2832 }
2833
2834
2835 static __be32
2836 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2837 {
2838         __be32 *p;
2839
2840         if (!nfserr) {
2841                 RESERVE_SPACE(20);
2842                 write_cinfo(&p, &link->li_cinfo);
2843                 ADJUST_ARGS();
2844         }
2845         return nfserr;
2846 }
2847
2848
2849 static __be32
2850 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2851 {
2852         __be32 *p;
2853
2854         if (nfserr)
2855                 goto out;
2856
2857         nfsd4_encode_stateid(resp, &open->op_stateid);
2858         RESERVE_SPACE(40);
2859         write_cinfo(&p, &open->op_cinfo);
2860         WRITE32(open->op_rflags);
2861         WRITE32(2);
2862         WRITE32(open->op_bmval[0]);
2863         WRITE32(open->op_bmval[1]);
2864         WRITE32(open->op_delegate_type);
2865         ADJUST_ARGS();
2866
2867         switch (open->op_delegate_type) {
2868         case NFS4_OPEN_DELEGATE_NONE:
2869                 break;
2870         case NFS4_OPEN_DELEGATE_READ:
2871                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2872                 RESERVE_SPACE(20);
2873                 WRITE32(open->op_recall);
2874
2875                 /*
2876                  * TODO: ACE's in delegations
2877                  */
2878                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2879                 WRITE32(0);
2880                 WRITE32(0);
2881                 WRITE32(0);   /* XXX: is NULL principal ok? */
2882                 ADJUST_ARGS();
2883                 break;
2884         case NFS4_OPEN_DELEGATE_WRITE:
2885                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2886                 RESERVE_SPACE(32);
2887                 WRITE32(0);
2888
2889                 /*
2890                  * TODO: space_limit's in delegations
2891                  */
2892                 WRITE32(NFS4_LIMIT_SIZE);
2893                 WRITE32(~(u32)0);
2894                 WRITE32(~(u32)0);
2895
2896                 /*
2897                  * TODO: ACE's in delegations
2898                  */
2899                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2900                 WRITE32(0);
2901                 WRITE32(0);
2902                 WRITE32(0);   /* XXX: is NULL principal ok? */
2903                 ADJUST_ARGS();
2904                 break;
2905         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2906                 switch (open->op_why_no_deleg) {
2907                 case WND4_CONTENTION:
2908                 case WND4_RESOURCE:
2909                         RESERVE_SPACE(8);
2910                         WRITE32(open->op_why_no_deleg);
2911                         WRITE32(0);     /* deleg signaling not supported yet */
2912                         break;
2913                 default:
2914                         RESERVE_SPACE(4);
2915                         WRITE32(open->op_why_no_deleg);
2916                 }
2917                 ADJUST_ARGS();
2918                 break;
2919         default:
2920                 BUG();
2921         }
2922         /* XXX save filehandle here */
2923 out:
2924         return nfserr;
2925 }
2926
2927 static __be32
2928 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2929 {
2930         if (!nfserr)
2931                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2932
2933         return nfserr;
2934 }
2935
2936 static __be32
2937 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2938 {
2939         if (!nfserr)
2940                 nfsd4_encode_stateid(resp, &od->od_stateid);
2941
2942         return nfserr;
2943 }
2944
2945 static __be32
2946 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2947                   struct nfsd4_read *read)
2948 {
2949         u32 eof;
2950         int v;
2951         struct page *page;
2952         unsigned long maxcount;
2953         long len;
2954         __be32 *p;
2955
2956         if (nfserr)
2957                 return nfserr;
2958         if (resp->xbuf->page_len)
2959                 return nfserr_resource;
2960
2961         RESERVE_SPACE(8); /* eof flag and byte count */
2962
2963         maxcount = svc_max_payload(resp->rqstp);
2964         if (maxcount > read->rd_length)
2965                 maxcount = read->rd_length;
2966
2967         len = maxcount;
2968         v = 0;
2969         while (len > 0) {
2970                 page = *(resp->rqstp->rq_next_page);
2971                 if (!page) { /* ran out of pages */
2972                         maxcount -= len;
2973                         break;
2974                 }
2975                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2976                 resp->rqstp->rq_vec[v].iov_len =
2977                         len < PAGE_SIZE ? len : PAGE_SIZE;
2978                 resp->rqstp->rq_next_page++;
2979                 v++;
2980                 len -= PAGE_SIZE;
2981         }
2982         read->rd_vlen = v;
2983
2984         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2985                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2986                         &maxcount);
2987
2988         if (nfserr)
2989                 return nfserr;
2990         eof = (read->rd_offset + maxcount >=
2991                read->rd_fhp->fh_dentry->d_inode->i_size);
2992
2993         WRITE32(eof);
2994         WRITE32(maxcount);
2995         ADJUST_ARGS();
2996         resp->xbuf->head[0].iov_len = (char*)p
2997                                         - (char*)resp->xbuf->head[0].iov_base;
2998         resp->xbuf->page_len = maxcount;
2999
3000         /* Use rest of head for padding and remaining ops: */
3001         resp->xbuf->tail[0].iov_base = p;
3002         resp->xbuf->tail[0].iov_len = 0;
3003         if (maxcount&3) {
3004                 RESERVE_SPACE(4);
3005                 WRITE32(0);
3006                 resp->xbuf->tail[0].iov_base += maxcount&3;
3007                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3008                 ADJUST_ARGS();
3009         }
3010         return 0;
3011 }
3012
3013 static __be32
3014 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3015 {
3016         int maxcount;
3017         char *page;
3018         __be32 *p;
3019
3020         if (nfserr)
3021                 return nfserr;
3022         if (resp->xbuf->page_len)
3023                 return nfserr_resource;
3024         if (!*resp->rqstp->rq_next_page)
3025                 return nfserr_resource;
3026
3027         page = page_address(*(resp->rqstp->rq_next_page++));
3028
3029         maxcount = PAGE_SIZE;
3030         RESERVE_SPACE(4);
3031
3032         /*
3033          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3034          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3035          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3036          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3037          */
3038         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3039         if (nfserr == nfserr_isdir)
3040                 return nfserr_inval;
3041         if (nfserr)
3042                 return nfserr;
3043
3044         WRITE32(maxcount);
3045         ADJUST_ARGS();
3046         resp->xbuf->head[0].iov_len = (char*)p
3047                                 - (char*)resp->xbuf->head[0].iov_base;
3048         resp->xbuf->page_len = maxcount;
3049
3050         /* Use rest of head for padding and remaining ops: */
3051         resp->xbuf->tail[0].iov_base = p;
3052         resp->xbuf->tail[0].iov_len = 0;
3053         if (maxcount&3) {
3054                 RESERVE_SPACE(4);
3055                 WRITE32(0);
3056                 resp->xbuf->tail[0].iov_base += maxcount&3;
3057                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3058                 ADJUST_ARGS();
3059         }
3060         return 0;
3061 }
3062
3063 static __be32
3064 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3065 {
3066         int maxcount;
3067         loff_t offset;
3068         __be32 *page, *savep, *tailbase;
3069         __be32 *p;
3070
3071         if (nfserr)
3072                 return nfserr;
3073         if (resp->xbuf->page_len)
3074                 return nfserr_resource;
3075         if (!*resp->rqstp->rq_next_page)
3076                 return nfserr_resource;
3077
3078         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3079         savep = p;
3080
3081         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3082         WRITE32(0);
3083         WRITE32(0);
3084         ADJUST_ARGS();
3085         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3086         tailbase = p;
3087
3088         maxcount = PAGE_SIZE;
3089         if (maxcount > readdir->rd_maxcount)
3090                 maxcount = readdir->rd_maxcount;
3091
3092         /*
3093          * Convert from bytes to words, account for the two words already
3094          * written, make sure to leave two words at the end for the next
3095          * pointer and eof field.
3096          */
3097         maxcount = (maxcount >> 2) - 4;
3098         if (maxcount < 0) {
3099                 nfserr =  nfserr_toosmall;
3100                 goto err_no_verf;
3101         }
3102
3103         page = page_address(*(resp->rqstp->rq_next_page++));
3104         readdir->common.err = 0;
3105         readdir->buflen = maxcount;
3106         readdir->buffer = page;
3107         readdir->offset = NULL;
3108
3109         offset = readdir->rd_cookie;
3110         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3111                               &offset,
3112                               &readdir->common, nfsd4_encode_dirent);
3113         if (nfserr == nfs_ok &&
3114             readdir->common.err == nfserr_toosmall &&
3115             readdir->buffer == page)
3116                 nfserr = nfserr_toosmall;
3117         if (nfserr)
3118                 goto err_no_verf;
3119
3120         if (readdir->offset)
3121                 xdr_encode_hyper(readdir->offset, offset);
3122
3123         p = readdir->buffer;
3124         *p++ = 0;       /* no more entries */
3125         *p++ = htonl(readdir->common.err == nfserr_eof);
3126         resp->xbuf->page_len = ((char*)p) -
3127                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3128
3129         /* Use rest of head for padding and remaining ops: */
3130         resp->xbuf->tail[0].iov_base = tailbase;
3131         resp->xbuf->tail[0].iov_len = 0;
3132         resp->p = resp->xbuf->tail[0].iov_base;
3133         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3134
3135         return 0;
3136 err_no_verf:
3137         p = savep;
3138         ADJUST_ARGS();
3139         return nfserr;
3140 }
3141
3142 static __be32
3143 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3144 {
3145         __be32 *p;
3146
3147         if (!nfserr) {
3148                 RESERVE_SPACE(20);
3149                 write_cinfo(&p, &remove->rm_cinfo);
3150                 ADJUST_ARGS();
3151         }
3152         return nfserr;
3153 }
3154
3155 static __be32
3156 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3157 {
3158         __be32 *p;
3159
3160         if (!nfserr) {
3161                 RESERVE_SPACE(40);
3162                 write_cinfo(&p, &rename->rn_sinfo);
3163                 write_cinfo(&p, &rename->rn_tinfo);
3164                 ADJUST_ARGS();
3165         }
3166         return nfserr;
3167 }
3168
3169 static __be32
3170 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3171                          __be32 nfserr, struct svc_export *exp)
3172 {
3173         u32 i, nflavs, supported;
3174         struct exp_flavor_info *flavs;
3175         struct exp_flavor_info def_flavs[2];
3176         __be32 *p, *flavorsp;
3177         static bool report = true;
3178
3179         if (nfserr)
3180                 goto out;
3181         if (exp->ex_nflavors) {
3182                 flavs = exp->ex_flavors;
3183                 nflavs = exp->ex_nflavors;
3184         } else { /* Handling of some defaults in absence of real secinfo: */
3185                 flavs = def_flavs;
3186                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3187                         nflavs = 2;
3188                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3189                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3190                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3191                         nflavs = 1;
3192                         flavs[0].pseudoflavor
3193                                         = svcauth_gss_flavor(exp->ex_client);
3194                 } else {
3195                         nflavs = 1;
3196                         flavs[0].pseudoflavor
3197                                         = exp->ex_client->flavour->flavour;
3198                 }
3199         }
3200
3201         supported = 0;
3202         RESERVE_SPACE(4);
3203         flavorsp = p++;         /* to be backfilled later */
3204         ADJUST_ARGS();
3205
3206         for (i = 0; i < nflavs; i++) {
3207                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3208                 struct rpcsec_gss_info info;
3209
3210                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3211                         supported++;
3212                         RESERVE_SPACE(4 + 4 + info.oid.len + 4 + 4);
3213                         WRITE32(RPC_AUTH_GSS);
3214                         WRITE32(info.oid.len);
3215                         WRITEMEM(info.oid.data, info.oid.len);
3216                         WRITE32(info.qop);
3217                         WRITE32(info.service);
3218                         ADJUST_ARGS();
3219                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3220                         supported++;
3221                         RESERVE_SPACE(4);
3222                         WRITE32(pf);
3223                         ADJUST_ARGS();
3224                 } else {
3225                         if (report)
3226                                 pr_warn("NFS: SECINFO: security flavor %u "
3227                                         "is not supported\n", pf);
3228                 }
3229         }
3230
3231         if (nflavs != supported)
3232                 report = false;
3233         *flavorsp = htonl(supported);
3234
3235 out:
3236         if (exp)
3237                 exp_put(exp);
3238         return nfserr;
3239 }
3240
3241 static __be32
3242 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3243                      struct nfsd4_secinfo *secinfo)
3244 {
3245         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3246 }
3247
3248 static __be32
3249 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3250                      struct nfsd4_secinfo_no_name *secinfo)
3251 {
3252         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3253 }
3254
3255 /*
3256  * The SETATTR encode routine is special -- it always encodes a bitmap,
3257  * regardless of the error status.
3258  */
3259 static __be32
3260 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3261 {
3262         __be32 *p;
3263
3264         RESERVE_SPACE(16);
3265         if (nfserr) {
3266                 WRITE32(3);
3267                 WRITE32(0);
3268                 WRITE32(0);
3269                 WRITE32(0);
3270         }
3271         else {
3272                 WRITE32(3);
3273                 WRITE32(setattr->sa_bmval[0]);
3274                 WRITE32(setattr->sa_bmval[1]);
3275                 WRITE32(setattr->sa_bmval[2]);
3276         }
3277         ADJUST_ARGS();
3278         return nfserr;
3279 }
3280
3281 static __be32
3282 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3283 {
3284         __be32 *p;
3285
3286         if (!nfserr) {
3287                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3288                 WRITEMEM(&scd->se_clientid, 8);
3289                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3290                 ADJUST_ARGS();
3291         }
3292         else if (nfserr == nfserr_clid_inuse) {
3293                 RESERVE_SPACE(8);
3294                 WRITE32(0);
3295                 WRITE32(0);
3296                 ADJUST_ARGS();
3297         }
3298         return nfserr;
3299 }
3300
3301 static __be32
3302 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3303 {
3304         __be32 *p;
3305
3306         if (!nfserr) {
3307                 RESERVE_SPACE(16);
3308                 WRITE32(write->wr_bytes_written);
3309                 WRITE32(write->wr_how_written);
3310                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3311                 ADJUST_ARGS();
3312         }
3313         return nfserr;
3314 }
3315
3316 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3317         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3318               1 << (OP_EXCHANGE_ID - 32) |
3319               1 << (OP_CREATE_SESSION - 32) |
3320               1 << (OP_DESTROY_SESSION - 32) |
3321               1 << (OP_DESTROY_CLIENTID - 32)
3322 };
3323
3324 static __be32
3325 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3326                          struct nfsd4_exchange_id *exid)
3327 {
3328         __be32 *p;
3329         char *major_id;
3330         char *server_scope;
3331         int major_id_sz;
3332         int server_scope_sz;
3333         uint64_t minor_id = 0;
3334
3335         if (nfserr)
3336                 return nfserr;
3337
3338         major_id = utsname()->nodename;
3339         major_id_sz = strlen(major_id);
3340         server_scope = utsname()->nodename;
3341         server_scope_sz = strlen(server_scope);
3342
3343         RESERVE_SPACE(
3344                 8 /* eir_clientid */ +
3345                 4 /* eir_sequenceid */ +
3346                 4 /* eir_flags */ +
3347                 4 /* spr_how */ +
3348                 8 /* spo_must_enforce, spo_must_allow */ +
3349                 8 /* so_minor_id */ +
3350                 4 /* so_major_id.len */ +
3351                 (XDR_QUADLEN(major_id_sz) * 4) +
3352                 4 /* eir_server_scope.len */ +
3353                 (XDR_QUADLEN(server_scope_sz) * 4) +
3354                 4 /* eir_server_impl_id.count (0) */);
3355
3356         WRITEMEM(&exid->clientid, 8);
3357         WRITE32(exid->seqid);
3358         WRITE32(exid->flags);
3359
3360         WRITE32(exid->spa_how);
3361         switch (exid->spa_how) {
3362         case SP4_NONE:
3363                 break;
3364         case SP4_MACH_CRED:
3365                 /* spo_must_enforce bitmap: */
3366                 WRITE32(2);
3367                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3368                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3369                 /* empty spo_must_allow bitmap: */
3370                 WRITE32(0);
3371                 break;
3372         default:
3373                 WARN_ON_ONCE(1);
3374         }
3375
3376         /* The server_owner struct */
3377         WRITE64(minor_id);      /* Minor id */
3378         /* major id */
3379         WRITE32(major_id_sz);
3380         WRITEMEM(major_id, major_id_sz);
3381
3382         /* Server scope */
3383         WRITE32(server_scope_sz);
3384         WRITEMEM(server_scope, server_scope_sz);
3385
3386         /* Implementation id */
3387         WRITE32(0);     /* zero length nfs_impl_id4 array */
3388         ADJUST_ARGS();
3389         return 0;
3390 }
3391
3392 static __be32
3393 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3394                             struct nfsd4_create_session *sess)
3395 {
3396         __be32 *p;
3397
3398         if (nfserr)
3399                 return nfserr;
3400
3401         RESERVE_SPACE(24);
3402         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3403         WRITE32(sess->seqid);
3404         WRITE32(sess->flags);
3405         ADJUST_ARGS();
3406
3407         RESERVE_SPACE(28);
3408         WRITE32(0); /* headerpadsz */
3409         WRITE32(sess->fore_channel.maxreq_sz);
3410         WRITE32(sess->fore_channel.maxresp_sz);
3411         WRITE32(sess->fore_channel.maxresp_cached);
3412         WRITE32(sess->fore_channel.maxops);
3413         WRITE32(sess->fore_channel.maxreqs);
3414         WRITE32(sess->fore_channel.nr_rdma_attrs);
3415         ADJUST_ARGS();
3416
3417         if (sess->fore_channel.nr_rdma_attrs) {
3418                 RESERVE_SPACE(4);
3419                 WRITE32(sess->fore_channel.rdma_attrs);
3420                 ADJUST_ARGS();
3421         }
3422
3423         RESERVE_SPACE(28);
3424         WRITE32(0); /* headerpadsz */
3425         WRITE32(sess->back_channel.maxreq_sz);
3426         WRITE32(sess->back_channel.maxresp_sz);
3427         WRITE32(sess->back_channel.maxresp_cached);
3428         WRITE32(sess->back_channel.maxops);
3429         WRITE32(sess->back_channel.maxreqs);
3430         WRITE32(sess->back_channel.nr_rdma_attrs);
3431         ADJUST_ARGS();
3432
3433         if (sess->back_channel.nr_rdma_attrs) {
3434                 RESERVE_SPACE(4);
3435                 WRITE32(sess->back_channel.rdma_attrs);
3436                 ADJUST_ARGS();
3437         }
3438         return 0;
3439 }
3440
3441 static __be32
3442 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3443                              struct nfsd4_destroy_session *destroy_session)
3444 {
3445         return nfserr;
3446 }
3447
3448 static __be32
3449 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3450                           struct nfsd4_free_stateid *free_stateid)
3451 {
3452         __be32 *p;
3453
3454         if (nfserr)
3455                 return nfserr;
3456
3457         RESERVE_SPACE(4);
3458         *p++ = nfserr;
3459         ADJUST_ARGS();
3460         return nfserr;
3461 }
3462
3463 static __be32
3464 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3465                       struct nfsd4_sequence *seq)
3466 {
3467         __be32 *p;
3468
3469         if (nfserr)
3470                 return nfserr;
3471
3472         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3473         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3474         WRITE32(seq->seqid);
3475         WRITE32(seq->slotid);
3476         /* Note slotid's are numbered from zero: */
3477         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3478         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3479         WRITE32(seq->status_flags);
3480
3481         ADJUST_ARGS();
3482         resp->cstate.datap = p; /* DRC cache data pointer */
3483         return 0;
3484 }
3485
3486 static __be32
3487 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3488                           struct nfsd4_test_stateid *test_stateid)
3489 {
3490         struct nfsd4_test_stateid_id *stateid, *next;
3491         __be32 *p;
3492
3493         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3494         *p++ = htonl(test_stateid->ts_num_ids);
3495
3496         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3497                 *p++ = stateid->ts_id_status;
3498         }
3499
3500         ADJUST_ARGS();
3501         return nfserr;
3502 }
3503
3504 static __be32
3505 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3506 {
3507         return nfserr;
3508 }
3509
3510 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3511
3512 /*
3513  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3514  * since we don't need to filter out obsolete ops as this is
3515  * done in the decoding phase.
3516  */
3517 static nfsd4_enc nfsd4_enc_ops[] = {
3518         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3519         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3520         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3521         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3522         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3523         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3524         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3525         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3526         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3527         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3528         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3529         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3530         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3531         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3532         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3533         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3534         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3535         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3536         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3537         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3538         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3539         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3540         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3541         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3542         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3543         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3544         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3545         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3546         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3547         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3548         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3549         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3550         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3551         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3552         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3553         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3554         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3555
3556         /* NFSv4.1 operations */
3557         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3558         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3559         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3560         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3561         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3562         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3563         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3564         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3565         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3566         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3567         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3568         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3569         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3570         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3571         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3572         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3573         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3574         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3575         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3576 };
3577
3578 /*
3579  * Calculate the total amount of memory that the compound response has taken
3580  * after encoding the current operation with pad.
3581  *
3582  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3583  *      which was specified at nfsd4_operation, else pad is zero.
3584  *
3585  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3586  *
3587  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3588  * will be at least a page and will therefore hold the xdr_buf head.
3589  */
3590 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3591 {
3592         struct xdr_buf *xb = &resp->rqstp->rq_res;
3593         struct nfsd4_session *session = NULL;
3594         struct nfsd4_slot *slot = resp->cstate.slot;
3595         u32 length, tlen = 0;
3596
3597         if (!nfsd4_has_session(&resp->cstate))
3598                 return 0;
3599
3600         session = resp->cstate.session;
3601         if (session == NULL)
3602                 return 0;
3603
3604         if (xb->page_len == 0) {
3605                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3606         } else {
3607                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3608                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3609
3610                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3611         }
3612         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3613                 length, xb->page_len, tlen, pad);
3614
3615         if (length > session->se_fchannel.maxresp_sz)
3616                 return nfserr_rep_too_big;
3617
3618         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3619             length > session->se_fchannel.maxresp_cached)
3620                 return nfserr_rep_too_big_to_cache;
3621
3622         return 0;
3623 }
3624
3625 void
3626 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3627 {
3628         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3629         __be32 *statp;
3630         __be32 *p;
3631
3632         RESERVE_SPACE(8);
3633         WRITE32(op->opnum);
3634         statp = p++;    /* to be backfilled at the end */
3635         ADJUST_ARGS();
3636
3637         if (op->opnum == OP_ILLEGAL)
3638                 goto status;
3639         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3640                !nfsd4_enc_ops[op->opnum]);
3641         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3642         /* nfsd4_check_drc_limit guarantees enough room for error status */
3643         if (!op->status)
3644                 op->status = nfsd4_check_resp_size(resp, 0);
3645         if (so) {
3646                 so->so_replay.rp_status = op->status;
3647                 so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3648                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3649         }
3650 status:
3651         /*
3652          * Note: We write the status directly, instead of using WRITE32(),
3653          * since it is already in network byte order.
3654          */
3655         *statp = op->status;
3656 }
3657
3658 /*
3659  * Encode the reply stored in the stateowner reply cache
3660  *
3661  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3662  * previously sent already encoded operation.
3663  *
3664  * called with nfs4_lock_state() held
3665  */
3666 void
3667 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3668 {
3669         __be32 *p;
3670         struct nfs4_replay *rp = op->replay;
3671
3672         BUG_ON(!rp);
3673
3674         RESERVE_SPACE(8);
3675         WRITE32(op->opnum);
3676         *p++ = rp->rp_status;  /* already xdr'ed */
3677         ADJUST_ARGS();
3678
3679         RESERVE_SPACE(rp->rp_buflen);
3680         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3681         ADJUST_ARGS();
3682 }
3683
3684 int
3685 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3686 {
3687         return xdr_ressize_check(rqstp, p);
3688 }
3689
3690 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3691 {
3692         struct svc_rqst *rqstp = rq;
3693         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3694
3695         if (args->ops != args->iops) {
3696                 kfree(args->ops);
3697                 args->ops = args->iops;
3698         }
3699         kfree(args->tmpp);
3700         args->tmpp = NULL;
3701         while (args->to_free) {
3702                 struct tmpbuf *tb = args->to_free;
3703                 args->to_free = tb->next;
3704                 tb->release(tb->buf);
3705                 kfree(tb);
3706         }
3707         return 1;
3708 }
3709
3710 int
3711 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3712 {
3713         args->p = p;
3714         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3715         args->pagelist = rqstp->rq_arg.pages;
3716         args->pagelen = rqstp->rq_arg.page_len;
3717         args->tmpp = NULL;
3718         args->to_free = NULL;
3719         args->ops = args->iops;
3720         args->rqstp = rqstp;
3721
3722         return !nfsd4_decode_compound(args);
3723 }
3724
3725 int
3726 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3727 {
3728         /*
3729          * All that remains is to write the tag and operation count...
3730          */
3731         struct nfsd4_compound_state *cs = &resp->cstate;
3732         struct kvec *iov;
3733         p = resp->tagp;
3734         *p++ = htonl(resp->taglen);
3735         memcpy(p, resp->tag, resp->taglen);
3736         p += XDR_QUADLEN(resp->taglen);
3737         *p++ = htonl(resp->opcnt);
3738
3739         if (rqstp->rq_res.page_len)
3740                 iov = &rqstp->rq_res.tail[0];
3741         else
3742                 iov = &rqstp->rq_res.head[0];
3743         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3744         BUG_ON(iov->iov_len > PAGE_SIZE);
3745         if (nfsd4_has_session(cs)) {
3746                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3747                 struct nfs4_client *clp = cs->session->se_client;
3748                 if (cs->status != nfserr_replay_cache) {
3749                         nfsd4_store_cache_entry(resp);
3750                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3751                 }
3752                 /* Renew the clientid on success and on replay */
3753                 spin_lock(&nn->client_lock);
3754                 nfsd4_put_session(cs->session);
3755                 spin_unlock(&nn->client_lock);
3756                 put_client_renew(clp);
3757         }
3758         return 1;
3759 }
3760
3761 /*
3762  * Local variables:
3763  *  c-basic-offset: 8
3764  * End:
3765  */