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                 label->len = dummy32;
 415                 defer_free(argp, kfree, label->data);
 416                 memcpy(label->data, buf, dummy32);
 417         }
 418 #endif
 419
 420         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 421             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 422             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 423                 READ_BUF(expected_len - len);
 424         else if (len != expected_len)
 425                 goto xdr_error;
 426
 427         DECODE_TAIL;
 428
 429 out_nfserr:
 430         status = nfserrno(host_err);
 431         goto out;
 432 }
 433
 434 static __be32
 435 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 436 {
 437         DECODE_HEAD;
 438
 439         READ_BUF(sizeof(stateid_t));
 440         READ32(sid->si_generation);
 441         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 442
 443         DECODE_TAIL;
 444 }
 445
 446 static __be32
 447 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 448 {
 449         DECODE_HEAD;
 450
 451         READ_BUF(4);
 452         READ32(access->ac_req_access);
 453
 454         DECODE_TAIL;
 455 }
 456
 457 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 458 {
 459         DECODE_HEAD;
 460         u32 dummy, uid, gid;
 461         char *machine_name;
 462         int i;
 463         int nr_secflavs;
 464
 465         /* callback_sec_params4 */
 466         READ_BUF(4);
 467         READ32(nr_secflavs);
 468         if (nr_secflavs)
 469                 cbs->flavor = (u32)(-1);
 470         else
 471                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 472                 cbs->flavor = 0;
 473         for (i = 0; i < nr_secflavs; ++i) {
 474                 READ_BUF(4);
 475                 READ32(dummy);
 476                 switch (dummy) {
 477                 case RPC_AUTH_NULL:
 478                         /* Nothing to read */
 479                         if (cbs->flavor == (u32)(-1))
 480                                 cbs->flavor = RPC_AUTH_NULL;
 481                         break;
 482                 case RPC_AUTH_UNIX:
 483                         READ_BUF(8);
 484                         /* stamp */
 485                         READ32(dummy);
 486
 487                         /* machine name */
 488                         READ32(dummy);
 489                         READ_BUF(dummy);
 490                         SAVEMEM(machine_name, dummy);
 491
 492                         /* uid, gid */
 493                         READ_BUF(8);
 494                         READ32(uid);
 495                         READ32(gid);
 496
 497                         /* more gids */
 498                         READ_BUF(4);
 499                         READ32(dummy);
 500                         READ_BUF(dummy * 4);
 501                         if (cbs->flavor == (u32)(-1)) {
 502                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 503                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 504                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 505                                         cbs->uid = kuid;
 506                                         cbs->gid = kgid;
 507                                         cbs->flavor = RPC_AUTH_UNIX;
 508                                 } else {
 509                                         dprintk("RPC_AUTH_UNIX with invalid"
 510                                                 "uid or gid ignoring!\n");
 511                                 }
 512                         }
 513                         break;
 514                 case RPC_AUTH_GSS:
 515                         dprintk("RPC_AUTH_GSS callback secflavor "
 516                                 "not supported!\n");
 517                         READ_BUF(8);
 518                         /* gcbp_service */
 519                         READ32(dummy);
 520                         /* gcbp_handle_from_server */
 521                         READ32(dummy);
 522                         READ_BUF(dummy);
 523                         p += XDR_QUADLEN(dummy);
 524                         /* gcbp_handle_from_client */
 525                         READ_BUF(4);
 526                         READ32(dummy);
 527                         READ_BUF(dummy);
 528                         break;
 529                 default:
 530                         dprintk("Illegal callback secflavor\n");
 531                         return nfserr_inval;
 532                 }
 533         }
 534         DECODE_TAIL;
 535 }
 536
 537 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 538 {
 539         DECODE_HEAD;
 540
 541         READ_BUF(4);
 542         READ32(bc->bc_cb_program);
 543         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 544
 545         DECODE_TAIL;
 546 }
 547
 548 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 549 {
 550         DECODE_HEAD;
 551
 552         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 553         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 554         READ32(bcts->dir);
 555         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 556          * could help us figure out we should be using it. */
 557         DECODE_TAIL;
 558 }
 559
 560 static __be32
 561 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 562 {
 563         DECODE_HEAD;
 564
 565         READ_BUF(4);
 566         READ32(close->cl_seqid);
 567         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 568
 569         DECODE_TAIL;
 570 }
 571
 572
 573 static __be32
 574 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 575 {
 576         DECODE_HEAD;
 577
 578         READ_BUF(12);
 579         READ64(commit->co_offset);
 580         READ32(commit->co_count);
 581
 582         DECODE_TAIL;
 583 }
 584
 585 static __be32
 586 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 587 {
 588         DECODE_HEAD;
 589
 590         READ_BUF(4);
 591         READ32(create->cr_type);
 592         switch (create->cr_type) {
 593         case NF4LNK:
 594                 READ_BUF(4);
 595                 READ32(create->cr_linklen);
 596                 READ_BUF(create->cr_linklen);
 597                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 598                 break;
 599         case NF4BLK:
 600         case NF4CHR:
 601                 READ_BUF(8);
 602                 READ32(create->cr_specdata1);
 603                 READ32(create->cr_specdata2);
 604                 break;
 605         case NF4SOCK:
 606         case NF4FIFO:
 607         case NF4DIR:
 608         default:
 609                 break;
 610         }
 611
 612         READ_BUF(4);
 613         READ32(create->cr_namelen);
 614         READ_BUF(create->cr_namelen);
 615         SAVEMEM(create->cr_name, create->cr_namelen);
 616         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 617                 return status;
 618
 619         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 620                                     &create->cr_acl, &create->cr_label);
 621         if (status)
 622                 goto out;
 623
 624         DECODE_TAIL;
 625 }
 626
 627 static inline __be32
 628 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 629 {
 630         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 631 }
 632
 633 static inline __be32
 634 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 635 {
 636         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 637 }
 638
 639 static __be32
 640 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 641 {
 642         DECODE_HEAD;
 643
 644         READ_BUF(4);
 645         READ32(link->li_namelen);
 646         READ_BUF(link->li_namelen);
 647         SAVEMEM(link->li_name, link->li_namelen);
 648         if ((status = check_filename(link->li_name, link->li_namelen)))
 649                 return status;
 650
 651         DECODE_TAIL;
 652 }
 653
 654 static __be32
 655 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 656 {
 657         DECODE_HEAD;
 658
 659         /*
 660         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 661         */
 662         READ_BUF(28);
 663         READ32(lock->lk_type);
 664         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 665                 goto xdr_error;
 666         READ32(lock->lk_reclaim);
 667         READ64(lock->lk_offset);
 668         READ64(lock->lk_length);
 669         READ32(lock->lk_is_new);
 670
 671         if (lock->lk_is_new) {
 672                 READ_BUF(4);
 673                 READ32(lock->lk_new_open_seqid);
 674                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 675                 if (status)
 676                         return status;
 677                 READ_BUF(8 + sizeof(clientid_t));
 678                 READ32(lock->lk_new_lock_seqid);
 679                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 680                 READ32(lock->lk_new_owner.len);
 681                 READ_BUF(lock->lk_new_owner.len);
 682                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 683         } else {
 684                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 685                 if (status)
 686                         return status;
 687                 READ_BUF(4);
 688                 READ32(lock->lk_old_lock_seqid);
 689         }
 690
 691         DECODE_TAIL;
 692 }
 693
 694 static __be32
 695 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 696 {
 697         DECODE_HEAD;
 698
 699         READ_BUF(32);
 700         READ32(lockt->lt_type);
 701         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 702                 goto xdr_error;
 703         READ64(lockt->lt_offset);
 704         READ64(lockt->lt_length);
 705         COPYMEM(&lockt->lt_clientid, 8);
 706         READ32(lockt->lt_owner.len);
 707         READ_BUF(lockt->lt_owner.len);
 708         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 709
 710         DECODE_TAIL;
 711 }
 712
 713 static __be32
 714 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 715 {
 716         DECODE_HEAD;
 717
 718         READ_BUF(8);
 719         READ32(locku->lu_type);
 720         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 721                 goto xdr_error;
 722         READ32(locku->lu_seqid);
 723         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 724         if (status)
 725                 return status;
 726         READ_BUF(16);
 727         READ64(locku->lu_offset);
 728         READ64(locku->lu_length);
 729
 730         DECODE_TAIL;
 731 }
 732
 733 static __be32
 734 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 735 {
 736         DECODE_HEAD;
 737
 738         READ_BUF(4);
 739         READ32(lookup->lo_len);
 740         READ_BUF(lookup->lo_len);
 741         SAVEMEM(lookup->lo_name, lookup->lo_len);
 742         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 743                 return status;
 744
 745         DECODE_TAIL;
 746 }
 747
 748 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 749 {
 750         __be32 *p;
 751         u32 w;
 752
 753         READ_BUF(4);
 754         READ32(w);
 755         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 756         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 757         if (deleg_when)
 758                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 759
 760         switch (w & NFS4_SHARE_ACCESS_MASK) {
 761         case NFS4_SHARE_ACCESS_READ:
 762         case NFS4_SHARE_ACCESS_WRITE:
 763         case NFS4_SHARE_ACCESS_BOTH:
 764                 break;
 765         default:
 766                 return nfserr_bad_xdr;
 767         }
 768         w &= ~NFS4_SHARE_ACCESS_MASK;
 769         if (!w)
 770                 return nfs_ok;
 771         if (!argp->minorversion)
 772                 return nfserr_bad_xdr;
 773         switch (w & NFS4_SHARE_WANT_MASK) {
 774         case NFS4_SHARE_WANT_NO_PREFERENCE:
 775         case NFS4_SHARE_WANT_READ_DELEG:
 776         case NFS4_SHARE_WANT_WRITE_DELEG:
 777         case NFS4_SHARE_WANT_ANY_DELEG:
 778         case NFS4_SHARE_WANT_NO_DELEG:
 779         case NFS4_SHARE_WANT_CANCEL:
 780                 break;
 781         default:
 782                 return nfserr_bad_xdr;
 783         }
 784         w &= ~NFS4_SHARE_WANT_MASK;
 785         if (!w)
 786                 return nfs_ok;
 787
 788         if (!deleg_when)        /* open_downgrade */
 789                 return nfserr_inval;
 790         switch (w) {
 791         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 792         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 793         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 794               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 795                 return nfs_ok;
 796         }
 797 xdr_error:
 798         return nfserr_bad_xdr;
 799 }
 800
 801 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 802 {
 803         __be32 *p;
 804
 805         READ_BUF(4);
 806         READ32(*x);
 807         /* Note: unlinke access bits, deny bits may be zero. */
 808         if (*x & ~NFS4_SHARE_DENY_BOTH)
 809                 return nfserr_bad_xdr;
 810         return nfs_ok;
 811 xdr_error:
 812         return nfserr_bad_xdr;
 813 }
 814
 815 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 816 {
 817         __be32 *p;
 818
 819         READ_BUF(4);
 820         READ32(o->len);
 821
 822         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 823                 return nfserr_bad_xdr;
 824
 825         READ_BUF(o->len);
 826         SAVEMEM(o->data, o->len);
 827         return nfs_ok;
 828 xdr_error:
 829         return nfserr_bad_xdr;
 830 }
 831
 832 static __be32
 833 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 834 {
 835         DECODE_HEAD;
 836         u32 dummy;
 837
 838         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 839         open->op_iattr.ia_valid = 0;
 840         open->op_openowner = NULL;
 841
 842         open->op_xdr_error = 0;
 843         /* seqid, share_access, share_deny, clientid, ownerlen */
 844         READ_BUF(4);
 845         READ32(open->op_seqid);
 846         /* decode, yet ignore deleg_when until supported */
 847         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 848                                            &open->op_deleg_want, &dummy);
 849         if (status)
 850                 goto xdr_error;
 851         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 852         if (status)
 853                 goto xdr_error;
 854         READ_BUF(sizeof(clientid_t));
 855         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 856         status = nfsd4_decode_opaque(argp, &open->op_owner);
 857         if (status)
 858                 goto xdr_error;
 859         READ_BUF(4);
 860         READ32(open->op_create);
 861         switch (open->op_create) {
 862         case NFS4_OPEN_NOCREATE:
 863                 break;
 864         case NFS4_OPEN_CREATE:
 865                 READ_BUF(4);
 866                 READ32(open->op_createmode);
 867                 switch (open->op_createmode) {
 868                 case NFS4_CREATE_UNCHECKED:
 869                 case NFS4_CREATE_GUARDED:
 870                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 871                                 &open->op_iattr, &open->op_acl, &open->op_label);
 872                         if (status)
 873                                 goto out;
 874                         break;
 875                 case NFS4_CREATE_EXCLUSIVE:
 876                         READ_BUF(NFS4_VERIFIER_SIZE);
 877                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 878                         break;
 879                 case NFS4_CREATE_EXCLUSIVE4_1:
 880                         if (argp->minorversion < 1)
 881                                 goto xdr_error;
 882                         READ_BUF(NFS4_VERIFIER_SIZE);
 883                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 884                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 885                                 &open->op_iattr, &open->op_acl, &open->op_label);
 886                         if (status)
 887                                 goto out;
 888                         break;
 889                 default:
 890                         goto xdr_error;
 891                 }
 892                 break;
 893         default:
 894                 goto xdr_error;
 895         }
 896
 897         /* open_claim */
 898         READ_BUF(4);
 899         READ32(open->op_claim_type);
 900         switch (open->op_claim_type) {
 901         case NFS4_OPEN_CLAIM_NULL:
 902         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 903                 READ_BUF(4);
 904                 READ32(open->op_fname.len);
 905                 READ_BUF(open->op_fname.len);
 906                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 907                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 908                         return status;
 909                 break;
 910         case NFS4_OPEN_CLAIM_PREVIOUS:
 911                 READ_BUF(4);
 912                 READ32(open->op_delegate_type);
 913                 break;
 914         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 915                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 916                 if (status)
 917                         return status;
 918                 READ_BUF(4);
 919                 READ32(open->op_fname.len);
 920                 READ_BUF(open->op_fname.len);
 921                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 922                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 923                         return status;
 924                 break;
 925         case NFS4_OPEN_CLAIM_FH:
 926         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 927                 if (argp->minorversion < 1)
 928                         goto xdr_error;
 929                 /* void */
 930                 break;
 931         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 932                 if (argp->minorversion < 1)
 933                         goto xdr_error;
 934                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 935                 if (status)
 936                         return status;
 937                 break;
 938         default:
 939                 goto xdr_error;
 940         }
 941
 942         DECODE_TAIL;
 943 }
 944
 945 static __be32
 946 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 947 {
 948         DECODE_HEAD;
 949
 950         if (argp->minorversion >= 1)
 951                 return nfserr_notsupp;
 952
 953         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 954         if (status)
 955                 return status;
 956         READ_BUF(4);
 957         READ32(open_conf->oc_seqid);
 958
 959         DECODE_TAIL;
 960 }
 961
 962 static __be32
 963 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 964 {
 965         DECODE_HEAD;
 966
 967         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 968         if (status)
 969                 return status;
 970         READ_BUF(4);
 971         READ32(open_down->od_seqid);
 972         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 973                                            &open_down->od_deleg_want, NULL);
 974         if (status)
 975                 return status;
 976         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 977         if (status)
 978                 return status;
 979         DECODE_TAIL;
 980 }
 981
 982 static __be32
 983 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 984 {
 985         DECODE_HEAD;
 986
 987         READ_BUF(4);
 988         READ32(putfh->pf_fhlen);
 989         if (putfh->pf_fhlen > NFS4_FHSIZE)
 990                 goto xdr_error;
 991         READ_BUF(putfh->pf_fhlen);
 992         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 993
 994         DECODE_TAIL;
 995 }
 996
 997 static __be32
 998 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
 999 {
1000         if (argp->minorversion == 0)
1001                 return nfs_ok;
1002         return nfserr_notsupp;
1003 }
1004
1005 static __be32
1006 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1007 {
1008         DECODE_HEAD;
1009
1010         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1011         if (status)
1012                 return status;
1013         READ_BUF(12);
1014         READ64(read->rd_offset);
1015         READ32(read->rd_length);
1016
1017         DECODE_TAIL;
1018 }
1019
1020 static __be32
1021 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1022 {
1023         DECODE_HEAD;
1024
1025         READ_BUF(24);
1026         READ64(readdir->rd_cookie);
1027         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1028         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
1029         READ32(readdir->rd_maxcount);
1030         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1031                 goto out;
1032
1033         DECODE_TAIL;
1034 }
1035
1036 static __be32
1037 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1038 {
1039         DECODE_HEAD;
1040
1041         READ_BUF(4);
1042         READ32(remove->rm_namelen);
1043         READ_BUF(remove->rm_namelen);
1044         SAVEMEM(remove->rm_name, remove->rm_namelen);
1045         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1046                 return status;
1047
1048         DECODE_TAIL;
1049 }
1050
1051 static __be32
1052 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1053 {
1054         DECODE_HEAD;
1055
1056         READ_BUF(4);
1057         READ32(rename->rn_snamelen);
1058         READ_BUF(rename->rn_snamelen + 4);
1059         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1060         READ32(rename->rn_tnamelen);
1061         READ_BUF(rename->rn_tnamelen);
1062         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1063         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1064                 return status;
1065         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1066                 return status;
1067
1068         DECODE_TAIL;
1069 }
1070
1071 static __be32
1072 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1073 {
1074         DECODE_HEAD;
1075
1076         if (argp->minorversion >= 1)
1077                 return nfserr_notsupp;
1078
1079         READ_BUF(sizeof(clientid_t));
1080         COPYMEM(clientid, sizeof(clientid_t));
1081
1082         DECODE_TAIL;
1083 }
1084
1085 static __be32
1086 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1087                      struct nfsd4_secinfo *secinfo)
1088 {
1089         DECODE_HEAD;
1090
1091         READ_BUF(4);
1092         READ32(secinfo->si_namelen);
1093         READ_BUF(secinfo->si_namelen);
1094         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1095         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1096         if (status)
1097                 return status;
1098         DECODE_TAIL;
1099 }
1100
1101 static __be32
1102 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1103                      struct nfsd4_secinfo_no_name *sin)
1104 {
1105         DECODE_HEAD;
1106
1107         READ_BUF(4);
1108         READ32(sin->sin_style);
1109         DECODE_TAIL;
1110 }
1111
1112 static __be32
1113 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1114 {
1115         __be32 status;
1116
1117         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1118         if (status)
1119                 return status;
1120         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1121                                   &setattr->sa_acl, &setattr->sa_label);
1122 }
1123
1124 static __be32
1125 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1126 {
1127         DECODE_HEAD;
1128
1129         if (argp->minorversion >= 1)
1130                 return nfserr_notsupp;
1131
1132         READ_BUF(NFS4_VERIFIER_SIZE);
1133         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1134
1135         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1136         if (status)
1137                 return nfserr_bad_xdr;
1138         READ_BUF(8);
1139         READ32(setclientid->se_callback_prog);
1140         READ32(setclientid->se_callback_netid_len);
1141
1142         READ_BUF(setclientid->se_callback_netid_len + 4);
1143         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1144         READ32(setclientid->se_callback_addr_len);
1145
1146         READ_BUF(setclientid->se_callback_addr_len + 4);
1147         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1148         READ32(setclientid->se_callback_ident);
1149
1150         DECODE_TAIL;
1151 }
1152
1153 static __be32
1154 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1155 {
1156         DECODE_HEAD;
1157
1158         if (argp->minorversion >= 1)
1159                 return nfserr_notsupp;
1160
1161         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1162         COPYMEM(&scd_c->sc_clientid, 8);
1163         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1164
1165         DECODE_TAIL;
1166 }
1167
1168 /* Also used for NVERIFY */
1169 static __be32
1170 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1171 {
1172         DECODE_HEAD;
1173
1174         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1175                 goto out;
1176
1177         /* For convenience's sake, we compare raw xdr'd attributes in
1178          * nfsd4_proc_verify */
1179
1180         READ_BUF(4);
1181         READ32(verify->ve_attrlen);
1182         READ_BUF(verify->ve_attrlen);
1183         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1184
1185         DECODE_TAIL;
1186 }
1187
1188 static __be32
1189 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1190 {
1191         int avail;
1192         int len;
1193         DECODE_HEAD;
1194
1195         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1196         if (status)
1197                 return status;
1198         READ_BUF(16);
1199         READ64(write->wr_offset);
1200         READ32(write->wr_stable_how);
1201         if (write->wr_stable_how > 2)
1202                 goto xdr_error;
1203         READ32(write->wr_buflen);
1204
1205         /* Sorry .. no magic macros for this.. *
1206          * READ_BUF(write->wr_buflen);
1207          * SAVEMEM(write->wr_buf, write->wr_buflen);
1208          */
1209         avail = (char*)argp->end - (char*)argp->p;
1210         if (avail + argp->pagelen < write->wr_buflen) {
1211                 dprintk("NFSD: xdr error (%s:%d)\n",
1212                                 __FILE__, __LINE__);
1213                 goto xdr_error;
1214         }
1215         write->wr_head.iov_base = p;
1216         write->wr_head.iov_len = avail;
1217         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1218         write->wr_pagelist = argp->pagelist;
1219
1220         len = XDR_QUADLEN(write->wr_buflen) << 2;
1221         if (len >= avail) {
1222                 int pages;
1223
1224                 len -= avail;
1225
1226                 pages = len >> PAGE_SHIFT;
1227                 argp->pagelist += pages;
1228                 argp->pagelen -= pages * PAGE_SIZE;
1229                 len -= pages * PAGE_SIZE;
1230
1231                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1232                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1233         }
1234         argp->p += XDR_QUADLEN(len);
1235
1236         DECODE_TAIL;
1237 }
1238
1239 static __be32
1240 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1241 {
1242         DECODE_HEAD;
1243
1244         if (argp->minorversion >= 1)
1245                 return nfserr_notsupp;
1246
1247         READ_BUF(12);
1248         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1249         READ32(rlockowner->rl_owner.len);
1250         READ_BUF(rlockowner->rl_owner.len);
1251         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1252
1253         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1254                 return nfserr_inval;
1255         DECODE_TAIL;
1256 }
1257
1258 static __be32
1259 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1260                          struct nfsd4_exchange_id *exid)
1261 {
1262         int dummy, tmp;
1263         DECODE_HEAD;
1264
1265         READ_BUF(NFS4_VERIFIER_SIZE);
1266         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1267
1268         status = nfsd4_decode_opaque(argp, &exid->clname);
1269         if (status)
1270                 return nfserr_bad_xdr;
1271
1272         READ_BUF(4);
1273         READ32(exid->flags);
1274
1275         /* Ignore state_protect4_a */
1276         READ_BUF(4);
1277         READ32(exid->spa_how);
1278         switch (exid->spa_how) {
1279         case SP4_NONE:
1280                 break;
1281         case SP4_MACH_CRED:
1282                 /* spo_must_enforce */
1283                 READ_BUF(4);
1284                 READ32(dummy);
1285                 READ_BUF(dummy * 4);
1286                 p += dummy;
1287
1288                 /* spo_must_allow */
1289                 READ_BUF(4);
1290                 READ32(dummy);
1291                 READ_BUF(dummy * 4);
1292                 p += dummy;
1293                 break;
1294         case SP4_SSV:
1295                 /* ssp_ops */
1296                 READ_BUF(4);
1297                 READ32(dummy);
1298                 READ_BUF(dummy * 4);
1299                 p += dummy;
1300
1301                 READ_BUF(4);
1302                 READ32(dummy);
1303                 READ_BUF(dummy * 4);
1304                 p += dummy;
1305
1306                 /* ssp_hash_algs<> */
1307                 READ_BUF(4);
1308                 READ32(tmp);
1309                 while (tmp--) {
1310                         READ_BUF(4);
1311                         READ32(dummy);
1312                         READ_BUF(dummy);
1313                         p += XDR_QUADLEN(dummy);
1314                 }
1315
1316                 /* ssp_encr_algs<> */
1317                 READ_BUF(4);
1318                 READ32(tmp);
1319                 while (tmp--) {
1320                         READ_BUF(4);
1321                         READ32(dummy);
1322                         READ_BUF(dummy);
1323                         p += XDR_QUADLEN(dummy);
1324                 }
1325
1326                 /* ssp_window and ssp_num_gss_handles */
1327                 READ_BUF(8);
1328                 READ32(dummy);
1329                 READ32(dummy);
1330                 break;
1331         default:
1332                 goto xdr_error;
1333         }
1334
1335         /* Ignore Implementation ID */
1336         READ_BUF(4);    /* nfs_impl_id4 array length */
1337         READ32(dummy);
1338
1339         if (dummy > 1)
1340                 goto xdr_error;
1341
1342         if (dummy == 1) {
1343                 /* nii_domain */
1344                 READ_BUF(4);
1345                 READ32(dummy);
1346                 READ_BUF(dummy);
1347                 p += XDR_QUADLEN(dummy);
1348
1349                 /* nii_name */
1350                 READ_BUF(4);
1351                 READ32(dummy);
1352                 READ_BUF(dummy);
1353                 p += XDR_QUADLEN(dummy);
1354
1355                 /* nii_date */
1356                 READ_BUF(12);
1357                 p += 3;
1358         }
1359         DECODE_TAIL;
1360 }
1361
1362 static __be32
1363 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1364                             struct nfsd4_create_session *sess)
1365 {
1366         DECODE_HEAD;
1367         u32 dummy;
1368
1369         READ_BUF(16);
1370         COPYMEM(&sess->clientid, 8);
1371         READ32(sess->seqid);
1372         READ32(sess->flags);
1373
1374         /* Fore channel attrs */
1375         READ_BUF(28);
1376         READ32(dummy); /* headerpadsz is always 0 */
1377         READ32(sess->fore_channel.maxreq_sz);
1378         READ32(sess->fore_channel.maxresp_sz);
1379         READ32(sess->fore_channel.maxresp_cached);
1380         READ32(sess->fore_channel.maxops);
1381         READ32(sess->fore_channel.maxreqs);
1382         READ32(sess->fore_channel.nr_rdma_attrs);
1383         if (sess->fore_channel.nr_rdma_attrs == 1) {
1384                 READ_BUF(4);
1385                 READ32(sess->fore_channel.rdma_attrs);
1386         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1387                 dprintk("Too many fore channel attr bitmaps!\n");
1388                 goto xdr_error;
1389         }
1390
1391         /* Back channel attrs */
1392         READ_BUF(28);
1393         READ32(dummy); /* headerpadsz is always 0 */
1394         READ32(sess->back_channel.maxreq_sz);
1395         READ32(sess->back_channel.maxresp_sz);
1396         READ32(sess->back_channel.maxresp_cached);
1397         READ32(sess->back_channel.maxops);
1398         READ32(sess->back_channel.maxreqs);
1399         READ32(sess->back_channel.nr_rdma_attrs);
1400         if (sess->back_channel.nr_rdma_attrs == 1) {
1401                 READ_BUF(4);
1402                 READ32(sess->back_channel.rdma_attrs);
1403         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1404                 dprintk("Too many back channel attr bitmaps!\n");
1405                 goto xdr_error;
1406         }
1407
1408         READ_BUF(4);
1409         READ32(sess->callback_prog);
1410         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1411         DECODE_TAIL;
1412 }
1413
1414 static __be32
1415 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1416                              struct nfsd4_destroy_session *destroy_session)
1417 {
1418         DECODE_HEAD;
1419         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1420         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1421
1422         DECODE_TAIL;
1423 }
1424
1425 static __be32
1426 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1427                           struct nfsd4_free_stateid *free_stateid)
1428 {
1429         DECODE_HEAD;
1430
1431         READ_BUF(sizeof(stateid_t));
1432         READ32(free_stateid->fr_stateid.si_generation);
1433         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1434
1435         DECODE_TAIL;
1436 }
1437
1438 static __be32
1439 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1440                       struct nfsd4_sequence *seq)
1441 {
1442         DECODE_HEAD;
1443
1444         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1445         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1446         READ32(seq->seqid);
1447         READ32(seq->slotid);
1448         READ32(seq->maxslots);
1449         READ32(seq->cachethis);
1450
1451         DECODE_TAIL;
1452 }
1453
1454 static __be32
1455 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1456 {
1457         int i;
1458         __be32 *p, status;
1459         struct nfsd4_test_stateid_id *stateid;
1460
1461         READ_BUF(4);
1462         test_stateid->ts_num_ids = ntohl(*p++);
1463
1464         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1465
1466         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1467                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1468                 if (!stateid) {
1469                         status = nfserrno(-ENOMEM);
1470                         goto out;
1471                 }
1472
1473                 defer_free(argp, kfree, stateid);
1474                 INIT_LIST_HEAD(&stateid->ts_id_list);
1475                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1476
1477                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1478                 if (status)
1479                         goto out;
1480         }
1481
1482         status = 0;
1483 out:
1484         return status;
1485 xdr_error:
1486         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1487         status = nfserr_bad_xdr;
1488         goto out;
1489 }
1490
1491 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1492 {
1493         DECODE_HEAD;
1494
1495         READ_BUF(8);
1496         COPYMEM(&dc->clientid, 8);
1497
1498         DECODE_TAIL;
1499 }
1500
1501 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1502 {
1503         DECODE_HEAD;
1504
1505         READ_BUF(4);
1506         READ32(rc->rca_one_fs);
1507
1508         DECODE_TAIL;
1509 }
1510
1511 static __be32
1512 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1513 {
1514         return nfs_ok;
1515 }
1516
1517 static __be32
1518 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1519 {
1520         return nfserr_notsupp;
1521 }
1522
1523 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1524
1525 static nfsd4_dec nfsd4_dec_ops[] = {
1526         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1527         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1528         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1529         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1530         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1531         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1532         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1533         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1534         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1535         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1536         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1537         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1538         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1539         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1540         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1541         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1542         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1543         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1544         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1545         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1546         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1547         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1548         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1549         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1550         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1551         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1552         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1553         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1554         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1555         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1556         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1557         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1558         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1559         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1560         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1561         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1562         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1563
1564         /* new operations for NFSv4.1 */
1565         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1566         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1567         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1568         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1569         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1570         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1571         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1572         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1573         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1574         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1575         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1576         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1577         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1578         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1579         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1580         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1581         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1582         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1583         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1584 };
1585
1586 static inline bool
1587 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1588 {
1589         if (op->opnum < FIRST_NFS4_OP)
1590                 return false;
1591         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1592                 return false;
1593         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1594                 return false;
1595         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1596                 return false;
1597         return true;
1598 }
1599
1600 static __be32
1601 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1602 {
1603         DECODE_HEAD;
1604         struct nfsd4_op *op;
1605         bool cachethis = false;
1606         int i;
1607
1608         READ_BUF(4);
1609         READ32(argp->taglen);
1610         READ_BUF(argp->taglen + 8);
1611         SAVEMEM(argp->tag, argp->taglen);
1612         READ32(argp->minorversion);
1613         READ32(argp->opcnt);
1614
1615         if (argp->taglen > NFSD4_MAX_TAGLEN)
1616                 goto xdr_error;
1617         if (argp->opcnt > 100)
1618                 goto xdr_error;
1619
1620         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1621                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1622                 if (!argp->ops) {
1623                         argp->ops = argp->iops;
1624                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1625                         goto xdr_error;
1626                 }
1627         }
1628
1629         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1630                 argp->opcnt = 0;
1631
1632         for (i = 0; i < argp->opcnt; i++) {
1633                 op = &argp->ops[i];
1634                 op->replay = NULL;
1635
1636                 READ_BUF(4);
1637                 READ32(op->opnum);
1638
1639                 if (nfsd4_opnum_in_range(argp, op))
1640                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1641                 else {
1642                         op->opnum = OP_ILLEGAL;
1643                         op->status = nfserr_op_illegal;
1644                 }
1645
1646                 if (op->status) {
1647                         argp->opcnt = i+1;
1648                         break;
1649                 }
1650                 /*
1651                  * We'll try to cache the result in the DRC if any one
1652                  * op in the compound wants to be cached:
1653                  */
1654                 cachethis |= nfsd4_cache_this_op(op);
1655         }
1656         /* Sessions make the DRC unnecessary: */
1657         if (argp->minorversion)
1658                 cachethis = false;
1659         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1660
1661         DECODE_TAIL;
1662 }
1663
1664 #define WRITE32(n)               *p++ = htonl(n)
1665 #define WRITE64(n)               do {                           \
1666         *p++ = htonl((u32)((n) >> 32));                         \
1667         *p++ = htonl((u32)(n));                                 \
1668 } while (0)
1669 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1670         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1671         memcpy(p, ptr, nbytes);                                 \
1672         p += XDR_QUADLEN(nbytes);                               \
1673 }} while (0)
1674
1675 static void write32(__be32 **p, u32 n)
1676 {
1677         *(*p)++ = htonl(n);
1678 }
1679
1680 static void write64(__be32 **p, u64 n)
1681 {
1682         write32(p, (n >> 32));
1683         write32(p, (u32)n);
1684 }
1685
1686 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1687 {
1688         if (IS_I_VERSION(inode)) {
1689                 write64(p, inode->i_version);
1690         } else {
1691                 write32(p, stat->ctime.tv_sec);
1692                 write32(p, stat->ctime.tv_nsec);
1693         }
1694 }
1695
1696 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1697 {
1698         write32(p, c->atomic);
1699         if (c->change_supported) {
1700                 write64(p, c->before_change);
1701                 write64(p, c->after_change);
1702         } else {
1703                 write32(p, c->before_ctime_sec);
1704                 write32(p, c->before_ctime_nsec);
1705                 write32(p, c->after_ctime_sec);
1706                 write32(p, c->after_ctime_nsec);
1707         }
1708 }
1709
1710 #define RESERVE_SPACE(nbytes)   do {                            \
1711         p = resp->p;                                            \
1712         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1713 } while (0)
1714 #define ADJUST_ARGS()           resp->p = p
1715
1716 /* Encode as an array of strings the string given with components
1717  * separated @sep, escaped with esc_enter and esc_exit.
1718  */
1719 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1720                                    __be32 **pp, int *buflen,
1721                                    char esc_enter, char esc_exit)
1722 {
1723         __be32 *p = *pp;
1724         __be32 *countp = p;
1725         int strlen, count=0;
1726         char *str, *end, *next;
1727
1728         dprintk("nfsd4_encode_components(%s)\n", components);
1729         if ((*buflen -= 4) < 0)
1730                 return nfserr_resource;
1731         WRITE32(0); /* We will fill this in with @count later */
1732         end = str = components;
1733         while (*end) {
1734                 bool found_esc = false;
1735
1736                 /* try to parse as esc_start, ..., esc_end, sep */
1737                 if (*str == esc_enter) {
1738                         for (; *end && (*end != esc_exit); end++)
1739                                 /* find esc_exit or end of string */;
1740                         next = end + 1;
1741                         if (*end && (!*next || *next == sep)) {
1742                                 str++;
1743                                 found_esc = true;
1744                         }
1745                 }
1746
1747                 if (!found_esc)
1748                         for (; *end && (*end != sep); end++)
1749                                 /* find sep or end of string */;
1750
1751                 strlen = end - str;
1752                 if (strlen) {
1753                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1754                                 return nfserr_resource;
1755                         WRITE32(strlen);
1756                         WRITEMEM(str, strlen);
1757                         count++;
1758                 }
1759                 else
1760                         end++;
1761                 str = end;
1762         }
1763         *pp = p;
1764         p = countp;
1765         WRITE32(count);
1766         return 0;
1767 }
1768
1769 /* Encode as an array of strings the string given with components
1770  * separated @sep.
1771  */
1772 static __be32 nfsd4_encode_components(char sep, char *components,
1773                                    __be32 **pp, int *buflen)
1774 {
1775         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1776 }
1777
1778 /*
1779  * encode a location element of a fs_locations structure
1780  */
1781 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1782                                     __be32 **pp, int *buflen)
1783 {
1784         __be32 status;
1785         __be32 *p = *pp;
1786
1787         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1788                                                 '[', ']');
1789         if (status)
1790                 return status;
1791         status = nfsd4_encode_components('/', location->path, &p, buflen);
1792         if (status)
1793                 return status;
1794         *pp = p;
1795         return 0;
1796 }
1797
1798 /*
1799  * Encode a path in RFC3530 'pathname4' format
1800  */
1801 static __be32 nfsd4_encode_path(const struct path *root,
1802                 const struct path *path, __be32 **pp, int *buflen)
1803 {
1804         struct path cur = *path;
1805         __be32 *p = *pp;
1806         struct dentry **components = NULL;
1807         unsigned int ncomponents = 0;
1808         __be32 err = nfserr_jukebox;
1809
1810         dprintk("nfsd4_encode_components(");
1811
1812         path_get(&cur);
1813         /* First walk the path up to the nfsd root, and store the
1814          * dentries/path components in an array.
1815          */
1816         for (;;) {
1817                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1818                         break;
1819                 if (cur.dentry == cur.mnt->mnt_root) {
1820                         if (follow_up(&cur))
1821                                 continue;
1822                         goto out_free;
1823                 }
1824                 if ((ncomponents & 15) == 0) {
1825                         struct dentry **new;
1826                         new = krealloc(components,
1827                                         sizeof(*new) * (ncomponents + 16),
1828                                         GFP_KERNEL);
1829                         if (!new)
1830                                 goto out_free;
1831                         components = new;
1832                 }
1833                 components[ncomponents++] = cur.dentry;
1834                 cur.dentry = dget_parent(cur.dentry);
1835         }
1836
1837         *buflen -= 4;
1838         if (*buflen < 0)
1839                 goto out_free;
1840         WRITE32(ncomponents);
1841
1842         while (ncomponents) {
1843                 struct dentry *dentry = components[ncomponents - 1];
1844                 unsigned int len;
1845
1846                 spin_lock(&dentry->d_lock);
1847                 len = dentry->d_name.len;
1848                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1849                 if (*buflen < 0) {
1850                         spin_unlock(&dentry->d_lock);
1851                         goto out_free;
1852                 }
1853                 WRITE32(len);
1854                 WRITEMEM(dentry->d_name.name, len);
1855                 dprintk("/%s", dentry->d_name.name);
1856                 spin_unlock(&dentry->d_lock);
1857                 dput(dentry);
1858                 ncomponents--;
1859         }
1860
1861         *pp = p;
1862         err = 0;
1863 out_free:
1864         dprintk(")\n");
1865         while (ncomponents)
1866                 dput(components[--ncomponents]);
1867         kfree(components);
1868         path_put(&cur);
1869         return err;
1870 }
1871
1872 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1873                 const struct path *path, __be32 **pp, int *buflen)
1874 {
1875         struct svc_export *exp_ps;
1876         __be32 res;
1877
1878         exp_ps = rqst_find_fsidzero_export(rqstp);
1879         if (IS_ERR(exp_ps))
1880                 return nfserrno(PTR_ERR(exp_ps));
1881         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1882         exp_put(exp_ps);
1883         return res;
1884 }
1885
1886 /*
1887  *  encode a fs_locations structure
1888  */
1889 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1890                                      struct svc_export *exp,
1891                                      __be32 **pp, int *buflen)
1892 {
1893         __be32 status;
1894         int i;
1895         __be32 *p = *pp;
1896         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1897
1898         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1899         if (status)
1900                 return status;
1901         if ((*buflen -= 4) < 0)
1902                 return nfserr_resource;
1903         WRITE32(fslocs->locations_count);
1904         for (i=0; i<fslocs->locations_count; i++) {
1905                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1906                                                    &p, buflen);
1907                 if (status)
1908                         return status;
1909         }
1910         *pp = p;
1911         return 0;
1912 }
1913
1914 static u32 nfs4_file_type(umode_t mode)
1915 {
1916         switch (mode & S_IFMT) {
1917         case S_IFIFO:   return NF4FIFO;
1918         case S_IFCHR:   return NF4CHR;
1919         case S_IFDIR:   return NF4DIR;
1920         case S_IFBLK:   return NF4BLK;
1921         case S_IFLNK:   return NF4LNK;
1922         case S_IFREG:   return NF4REG;
1923         case S_IFSOCK:  return NF4SOCK;
1924         default:        return NF4BAD;
1925         };
1926 }
1927
1928 static __be32
1929 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1930                         __be32 **p, int *buflen)
1931 {
1932         int status;
1933
1934         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1935                 return nfserr_resource;
1936         if (whotype != NFS4_ACL_WHO_NAMED)
1937                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1938         else if (gid_valid(gid))
1939                 status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1940         else
1941                 status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1942         if (status < 0)
1943                 return nfserrno(status);
1944         *p = xdr_encode_opaque(*p, NULL, status);
1945         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1946         BUG_ON(*buflen < 0);
1947         return 0;
1948 }
1949
1950 static inline __be32
1951 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1952 {
1953         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1954                                  p, buflen);
1955 }
1956
1957 static inline __be32
1958 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1959 {
1960         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
1961                                  p, buflen);
1962 }
1963
1964 static inline __be32
1965 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1966                 __be32 **p, int *buflen)
1967 {
1968         kuid_t uid = INVALID_UID;
1969         kgid_t gid = INVALID_GID;
1970
1971         if (ace->whotype == NFS4_ACL_WHO_NAMED) {
1972                 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1973                         gid = ace->who_gid;
1974                 else
1975                         uid = ace->who_uid;
1976         }
1977         return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
1978 }
1979
1980 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1981                               FATTR4_WORD0_RDATTR_ERROR)
1982 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1983
1984 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1985 static inline __be32
1986 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
1987 {
1988         __be32 *p = *pp;
1989
1990         if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4))
1991                 return nfserr_resource;
1992
1993         /*
1994          * For now we use a 0 here to indicate the null translation; in
1995          * the future we may place a call to translation code here.
1996          */
1997         if ((*buflen -= 8) < 0)
1998                 return nfserr_resource;
1999
2000         WRITE32(0); /* lfs */
2001         WRITE32(0); /* pi */
2002         p = xdr_encode_opaque(p, context, len);
2003         *buflen -= (XDR_QUADLEN(len) << 2) + 4;
2004
2005         *pp = p;
2006         return 0;
2007 }
2008 #else
2009 static inline __be32
2010 nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2011 { return 0; }
2012 #endif
2013
2014 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2015 {
2016         /* As per referral draft:  */
2017         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2018             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2019                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2020                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2021                         *rdattr_err = NFSERR_MOVED;
2022                 else
2023                         return nfserr_moved;
2024         }
2025         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2026         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2027         return 0;
2028 }
2029
2030
2031 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2032 {
2033         struct path path = exp->ex_path;
2034         int err;
2035
2036         path_get(&path);
2037         while (follow_up(&path)) {
2038                 if (path.dentry != path.mnt->mnt_root)
2039                         break;
2040         }
2041         err = vfs_getattr(&path, stat);
2042         path_put(&path);
2043         return err;
2044 }
2045
2046 /*
2047  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2048  * ourselves.
2049  *
2050  * countp is the buffer size in _words_
2051  */
2052 __be32
2053 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2054                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
2055                 struct svc_rqst *rqstp, int ignore_crossmnt)
2056 {
2057         u32 bmval0 = bmval[0];
2058         u32 bmval1 = bmval[1];
2059         u32 bmval2 = bmval[2];
2060         struct kstat stat;
2061         struct svc_fh tempfh;
2062         struct kstatfs statfs;
2063         int buflen = count << 2;
2064         __be32 *attrlenp;
2065         u32 dummy;
2066         u64 dummy64;
2067         u32 rdattr_err = 0;
2068         __be32 *p = *buffer;
2069         __be32 status;
2070         int err;
2071         int aclsupport = 0;
2072         struct nfs4_acl *acl = NULL;
2073         void *context = NULL;
2074         int contextlen;
2075         bool contextsupport = false;
2076         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2077         u32 minorversion = resp->cstate.minorversion;
2078         struct path path = {
2079                 .mnt    = exp->ex_path.mnt,
2080                 .dentry = dentry,
2081         };
2082         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2083
2084         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2085         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2086         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2087         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2088
2089         if (exp->ex_fslocs.migrated) {
2090                 BUG_ON(bmval[2]);
2091                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2092                 if (status)
2093                         goto out;
2094         }
2095
2096         err = vfs_getattr(&path, &stat);
2097         if (err)
2098                 goto out_nfserr;
2099         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2100                         FATTR4_WORD0_MAXNAME)) ||
2101             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2102                        FATTR4_WORD1_SPACE_TOTAL))) {
2103                 err = vfs_statfs(&path, &statfs);
2104                 if (err)
2105                         goto out_nfserr;
2106         }
2107         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2108                 fh_init(&tempfh, NFS4_FHSIZE);
2109                 status = fh_compose(&tempfh, exp, dentry, NULL);
2110                 if (status)
2111                         goto out;
2112                 fhp = &tempfh;
2113         }
2114         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2115                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2116                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2117                 aclsupport = (err == 0);
2118                 if (bmval0 & FATTR4_WORD0_ACL) {
2119                         if (err == -EOPNOTSUPP)
2120                                 bmval0 &= ~FATTR4_WORD0_ACL;
2121                         else if (err == -EINVAL) {
2122                                 status = nfserr_attrnotsupp;
2123                                 goto out;
2124                         } else if (err != 0)
2125                                 goto out_nfserr;
2126                 }
2127         }
2128
2129 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2130         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2131                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2132                 err = security_inode_getsecctx(dentry->d_inode,
2133                                                 &context, &contextlen);
2134                 contextsupport = (err == 0);
2135                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2136                         if (err == -EOPNOTSUPP)
2137                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2138                         else if (err)
2139                                 goto out_nfserr;
2140                 }
2141         }
2142 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2143
2144         if (bmval2) {
2145                 if ((buflen -= 16) < 0)
2146                         goto out_resource;
2147                 WRITE32(3);
2148                 WRITE32(bmval0);
2149                 WRITE32(bmval1);
2150                 WRITE32(bmval2);
2151         } else if (bmval1) {
2152                 if ((buflen -= 12) < 0)
2153                         goto out_resource;
2154                 WRITE32(2);
2155                 WRITE32(bmval0);
2156                 WRITE32(bmval1);
2157         } else {
2158                 if ((buflen -= 8) < 0)
2159                         goto out_resource;
2160                 WRITE32(1);
2161                 WRITE32(bmval0);
2162         }
2163         attrlenp = p++;                /* to be backfilled later */
2164
2165         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2166                 u32 word0 = nfsd_suppattrs0(minorversion);
2167                 u32 word1 = nfsd_suppattrs1(minorversion);
2168                 u32 word2 = nfsd_suppattrs2(minorversion);
2169
2170                 if (!aclsupport)
2171                         word0 &= ~FATTR4_WORD0_ACL;
2172                 if (!contextsupport)
2173                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2174                 if (!word2) {
2175                         if ((buflen -= 12) < 0)
2176                                 goto out_resource;
2177                         WRITE32(2);
2178                         WRITE32(word0);
2179                         WRITE32(word1);
2180                 } else {
2181                         if ((buflen -= 16) < 0)
2182                                 goto out_resource;
2183                         WRITE32(3);
2184                         WRITE32(word0);
2185                         WRITE32(word1);
2186                         WRITE32(word2);
2187                 }
2188         }
2189         if (bmval0 & FATTR4_WORD0_TYPE) {
2190                 if ((buflen -= 4) < 0)
2191                         goto out_resource;
2192                 dummy = nfs4_file_type(stat.mode);
2193                 if (dummy == NF4BAD)
2194                         goto out_serverfault;
2195                 WRITE32(dummy);
2196         }
2197         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2198                 if ((buflen -= 4) < 0)
2199                         goto out_resource;
2200                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2201                         WRITE32(NFS4_FH_PERSISTENT);
2202                 else
2203                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2204         }
2205         if (bmval0 & FATTR4_WORD0_CHANGE) {
2206                 if ((buflen -= 8) < 0)
2207                         goto out_resource;
2208                 write_change(&p, &stat, dentry->d_inode);
2209         }
2210         if (bmval0 & FATTR4_WORD0_SIZE) {
2211                 if ((buflen -= 8) < 0)
2212                         goto out_resource;
2213                 WRITE64(stat.size);
2214         }
2215         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2216                 if ((buflen -= 4) < 0)
2217                         goto out_resource;
2218                 WRITE32(1);
2219         }
2220         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2221                 if ((buflen -= 4) < 0)
2222                         goto out_resource;
2223                 WRITE32(1);
2224         }
2225         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2226                 if ((buflen -= 4) < 0)
2227                         goto out_resource;
2228                 WRITE32(0);
2229         }
2230         if (bmval0 & FATTR4_WORD0_FSID) {
2231                 if ((buflen -= 16) < 0)
2232                         goto out_resource;
2233                 if (exp->ex_fslocs.migrated) {
2234                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2235                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2236                 } else switch(fsid_source(fhp)) {
2237                 case FSIDSOURCE_FSID:
2238                         WRITE64((u64)exp->ex_fsid);
2239                         WRITE64((u64)0);
2240                         break;
2241                 case FSIDSOURCE_DEV:
2242                         WRITE32(0);
2243                         WRITE32(MAJOR(stat.dev));
2244                         WRITE32(0);
2245                         WRITE32(MINOR(stat.dev));
2246                         break;
2247                 case FSIDSOURCE_UUID:
2248                         WRITEMEM(exp->ex_uuid, 16);
2249                         break;
2250                 }
2251         }
2252         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2253                 if ((buflen -= 4) < 0)
2254                         goto out_resource;
2255                 WRITE32(0);
2256         }
2257         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2258                 if ((buflen -= 4) < 0)
2259                         goto out_resource;
2260                 WRITE32(nn->nfsd4_lease);
2261         }
2262         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2263                 if ((buflen -= 4) < 0)
2264                         goto out_resource;
2265                 WRITE32(rdattr_err);
2266         }
2267         if (bmval0 & FATTR4_WORD0_ACL) {
2268                 struct nfs4_ace *ace;
2269
2270                 if (acl == NULL) {
2271                         if ((buflen -= 4) < 0)
2272                                 goto out_resource;
2273
2274                         WRITE32(0);
2275                         goto out_acl;
2276                 }
2277                 if ((buflen -= 4) < 0)
2278                         goto out_resource;
2279                 WRITE32(acl->naces);
2280
2281                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2282                         if ((buflen -= 4*3) < 0)
2283                                 goto out_resource;
2284                         WRITE32(ace->type);
2285                         WRITE32(ace->flag);
2286                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2287                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2288                         if (status == nfserr_resource)
2289                                 goto out_resource;
2290                         if (status)
2291                                 goto out;
2292                 }
2293         }
2294 out_acl:
2295         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2296                 if ((buflen -= 4) < 0)
2297                         goto out_resource;
2298                 WRITE32(aclsupport ?
2299                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2300         }
2301         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2302                 if ((buflen -= 4) < 0)
2303                         goto out_resource;
2304                 WRITE32(1);
2305         }
2306         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2307                 if ((buflen -= 4) < 0)
2308                         goto out_resource;
2309                 WRITE32(0);
2310         }
2311         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2312                 if ((buflen -= 4) < 0)
2313                         goto out_resource;
2314                 WRITE32(1);
2315         }
2316         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2317                 if ((buflen -= 4) < 0)
2318                         goto out_resource;
2319                 WRITE32(1);
2320         }
2321         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2322                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2323                 if (buflen < 0)
2324                         goto out_resource;
2325                 WRITE32(fhp->fh_handle.fh_size);
2326                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2327         }
2328         if (bmval0 & FATTR4_WORD0_FILEID) {
2329                 if ((buflen -= 8) < 0)
2330                         goto out_resource;
2331                 WRITE64(stat.ino);
2332         }
2333         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2334                 if ((buflen -= 8) < 0)
2335                         goto out_resource;
2336                 WRITE64((u64) statfs.f_ffree);
2337         }
2338         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2339                 if ((buflen -= 8) < 0)
2340                         goto out_resource;
2341                 WRITE64((u64) statfs.f_ffree);
2342         }
2343         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2344                 if ((buflen -= 8) < 0)
2345                         goto out_resource;
2346                 WRITE64((u64) statfs.f_files);
2347         }
2348         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2349                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2350                 if (status == nfserr_resource)
2351                         goto out_resource;
2352                 if (status)
2353                         goto out;
2354         }
2355         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2356                 if ((buflen -= 4) < 0)
2357                         goto out_resource;
2358                 WRITE32(1);
2359         }
2360         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2361                 if ((buflen -= 8) < 0)
2362                         goto out_resource;
2363                 WRITE64(~(u64)0);
2364         }
2365         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2366                 if ((buflen -= 4) < 0)
2367                         goto out_resource;
2368                 WRITE32(255);
2369         }
2370         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2371                 if ((buflen -= 4) < 0)
2372                         goto out_resource;
2373                 WRITE32(statfs.f_namelen);
2374         }
2375         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2376                 if ((buflen -= 8) < 0)
2377                         goto out_resource;
2378                 WRITE64((u64) svc_max_payload(rqstp));
2379         }
2380         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2381                 if ((buflen -= 8) < 0)
2382                         goto out_resource;
2383                 WRITE64((u64) svc_max_payload(rqstp));
2384         }
2385         if (bmval1 & FATTR4_WORD1_MODE) {
2386                 if ((buflen -= 4) < 0)
2387                         goto out_resource;
2388                 WRITE32(stat.mode & S_IALLUGO);
2389         }
2390         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2391                 if ((buflen -= 4) < 0)
2392                         goto out_resource;
2393                 WRITE32(1);
2394         }
2395         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2396                 if ((buflen -= 4) < 0)
2397                         goto out_resource;
2398                 WRITE32(stat.nlink);
2399         }
2400         if (bmval1 & FATTR4_WORD1_OWNER) {
2401                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2402                 if (status == nfserr_resource)
2403                         goto out_resource;
2404                 if (status)
2405                         goto out;
2406         }
2407         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2408                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2409                 if (status == nfserr_resource)
2410                         goto out_resource;
2411                 if (status)
2412                         goto out;
2413         }
2414         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2415                 if ((buflen -= 8) < 0)
2416                         goto out_resource;
2417                 WRITE32((u32) MAJOR(stat.rdev));
2418                 WRITE32((u32) MINOR(stat.rdev));
2419         }
2420         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2421                 if ((buflen -= 8) < 0)
2422                         goto out_resource;
2423                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2424                 WRITE64(dummy64);
2425         }
2426         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2427                 if ((buflen -= 8) < 0)
2428                         goto out_resource;
2429                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2430                 WRITE64(dummy64);
2431         }
2432         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2433                 if ((buflen -= 8) < 0)
2434                         goto out_resource;
2435                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2436                 WRITE64(dummy64);
2437         }
2438         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2439                 if ((buflen -= 8) < 0)
2440                         goto out_resource;
2441                 dummy64 = (u64)stat.blocks << 9;
2442                 WRITE64(dummy64);
2443         }
2444         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2445                 if ((buflen -= 12) < 0)
2446                         goto out_resource;
2447                 WRITE64((s64)stat.atime.tv_sec);
2448                 WRITE32(stat.atime.tv_nsec);
2449         }
2450         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2451                 if ((buflen -= 12) < 0)
2452                         goto out_resource;
2453                 WRITE32(0);
2454                 WRITE32(1);
2455                 WRITE32(0);
2456         }
2457         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2458                 if ((buflen -= 12) < 0)
2459                         goto out_resource;
2460                 WRITE64((s64)stat.ctime.tv_sec);
2461                 WRITE32(stat.ctime.tv_nsec);
2462         }
2463         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2464                 if ((buflen -= 12) < 0)
2465                         goto out_resource;
2466                 WRITE64((s64)stat.mtime.tv_sec);
2467                 WRITE32(stat.mtime.tv_nsec);
2468         }
2469         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2470                 if ((buflen -= 8) < 0)
2471                         goto out_resource;
2472                 /*
2473                  * Get parent's attributes if not ignoring crossmount
2474                  * and this is the root of a cross-mounted filesystem.
2475                  */
2476                 if (ignore_crossmnt == 0 &&
2477                     dentry == exp->ex_path.mnt->mnt_root)
2478                         get_parent_attributes(exp, &stat);
2479                 WRITE64(stat.ino);
2480         }
2481         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2482                 status = nfsd4_encode_security_label(rqstp, context,
2483                                 contextlen, &p, &buflen);
2484                 if (status)
2485                         goto out;
2486         }
2487         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2488                 WRITE32(3);
2489                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2490                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2491                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2492         }
2493
2494         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2495         *buffer = p;
2496         status = nfs_ok;
2497
2498 out:
2499 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2500         if (context)
2501                 security_release_secctx(context, contextlen);
2502 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2503         kfree(acl);
2504         if (fhp == &tempfh)
2505                 fh_put(&tempfh);
2506         return status;
2507 out_nfserr:
2508         status = nfserrno(err);
2509         goto out;
2510 out_resource:
2511         status = nfserr_resource;
2512         goto out;
2513 out_serverfault:
2514         status = nfserr_serverfault;
2515         goto out;
2516 }
2517
2518 static inline int attributes_need_mount(u32 *bmval)
2519 {
2520         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2521                 return 1;
2522         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2523                 return 1;
2524         return 0;
2525 }
2526
2527 static __be32
2528 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2529                 const char *name, int namlen, __be32 **p, int buflen)
2530 {
2531         struct svc_export *exp = cd->rd_fhp->fh_export;
2532         struct dentry *dentry;
2533         __be32 nfserr;
2534         int ignore_crossmnt = 0;
2535
2536         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2537         if (IS_ERR(dentry))
2538                 return nfserrno(PTR_ERR(dentry));
2539         if (!dentry->d_inode) {
2540                 /*
2541                  * nfsd_buffered_readdir drops the i_mutex between
2542                  * readdir and calling this callback, leaving a window
2543                  * where this directory entry could have gone away.
2544                  */
2545                 dput(dentry);
2546                 return nfserr_noent;
2547         }
2548
2549         exp_get(exp);
2550         /*
2551          * In the case of a mountpoint, the client may be asking for
2552          * attributes that are only properties of the underlying filesystem
2553          * as opposed to the cross-mounted file system. In such a case,
2554          * we will not follow the cross mount and will fill the attribtutes
2555          * directly from the mountpoint dentry.
2556          */
2557         if (nfsd_mountpoint(dentry, exp)) {
2558                 int err;
2559
2560                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2561                                 && !attributes_need_mount(cd->rd_bmval)) {
2562                         ignore_crossmnt = 1;
2563                         goto out_encode;
2564                 }
2565                 /*
2566                  * Why the heck aren't we just using nfsd_lookup??
2567                  * Different "."/".." handling?  Something else?
2568                  * At least, add a comment here to explain....
2569                  */
2570                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2571                 if (err) {
2572                         nfserr = nfserrno(err);
2573                         goto out_put;
2574                 }
2575                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2576                 if (nfserr)
2577                         goto out_put;
2578
2579         }
2580 out_encode:
2581         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2582                                         cd->rd_rqstp, ignore_crossmnt);
2583 out_put:
2584         dput(dentry);
2585         exp_put(exp);
2586         return nfserr;
2587 }
2588
2589 static __be32 *
2590 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2591 {
2592         __be32 *attrlenp;
2593
2594         if (buflen < 6)
2595                 return NULL;
2596         *p++ = htonl(2);
2597         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2598         *p++ = htonl(0);                         /* bmval1 */
2599
2600         attrlenp = p++;
2601         *p++ = nfserr;       /* no htonl */
2602         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2603         return p;
2604 }
2605
2606 static int
2607 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2608                     loff_t offset, u64 ino, unsigned int d_type)
2609 {
2610         struct readdir_cd *ccd = ccdv;
2611         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2612         int buflen;
2613         __be32 *p = cd->buffer;
2614         __be32 *cookiep;
2615         __be32 nfserr = nfserr_toosmall;
2616
2617         /* In nfsv4, "." and ".." never make it onto the wire.. */
2618         if (name && isdotent(name, namlen)) {
2619                 cd->common.err = nfs_ok;
2620                 return 0;
2621         }
2622
2623         if (cd->offset)
2624                 xdr_encode_hyper(cd->offset, (u64) offset);
2625
2626         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2627         if (buflen < 0)
2628                 goto fail;
2629
2630         *p++ = xdr_one;                             /* mark entry present */
2631         cookiep = p;
2632         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2633         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2634
2635         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2636         switch (nfserr) {
2637         case nfs_ok:
2638                 break;
2639         case nfserr_resource:
2640                 nfserr = nfserr_toosmall;
2641                 goto fail;
2642         case nfserr_noent:
2643                 goto skip_entry;
2644         default:
2645                 /*
2646                  * If the client requested the RDATTR_ERROR attribute,
2647                  * we stuff the error code into this attribute
2648                  * and continue.  If this attribute was not requested,
2649                  * then in accordance with the spec, we fail the
2650                  * entire READDIR operation(!)
2651                  */
2652                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2653                         goto fail;
2654                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2655                 if (p == NULL) {
2656                         nfserr = nfserr_toosmall;
2657                         goto fail;
2658                 }
2659         }
2660         cd->buflen -= (p - cd->buffer);
2661         cd->buffer = p;
2662         cd->offset = cookiep;
2663 skip_entry:
2664         cd->common.err = nfs_ok;
2665         return 0;
2666 fail:
2667         cd->common.err = nfserr;
2668         return -EINVAL;
2669 }
2670
2671 static void
2672 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2673 {
2674         __be32 *p;
2675
2676         RESERVE_SPACE(sizeof(stateid_t));
2677         WRITE32(sid->si_generation);
2678         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2679         ADJUST_ARGS();
2680 }
2681
2682 static __be32
2683 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2684 {
2685         __be32 *p;
2686
2687         if (!nfserr) {
2688                 RESERVE_SPACE(8);
2689                 WRITE32(access->ac_supported);
2690                 WRITE32(access->ac_resp_access);
2691                 ADJUST_ARGS();
2692         }
2693         return nfserr;
2694 }
2695
2696 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2697 {
2698         __be32 *p;
2699
2700         if (!nfserr) {
2701                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2702                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2703                 WRITE32(bcts->dir);
2704                 /* Sorry, we do not yet support RDMA over 4.1: */
2705                 WRITE32(0);
2706                 ADJUST_ARGS();
2707         }
2708         return nfserr;
2709 }
2710
2711 static __be32
2712 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2713 {
2714         if (!nfserr)
2715                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2716
2717         return nfserr;
2718 }
2719
2720
2721 static __be32
2722 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2723 {
2724         __be32 *p;
2725
2726         if (!nfserr) {
2727                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2728                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2729                 ADJUST_ARGS();
2730         }
2731         return nfserr;
2732 }
2733
2734 static __be32
2735 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2736 {
2737         __be32 *p;
2738
2739         if (!nfserr) {
2740                 RESERVE_SPACE(32);
2741                 write_cinfo(&p, &create->cr_cinfo);
2742                 WRITE32(2);
2743                 WRITE32(create->cr_bmval[0]);
2744                 WRITE32(create->cr_bmval[1]);
2745                 ADJUST_ARGS();
2746         }
2747         return nfserr;
2748 }
2749
2750 static __be32
2751 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2752 {
2753         struct svc_fh *fhp = getattr->ga_fhp;
2754         int buflen;
2755
2756         if (nfserr)
2757                 return nfserr;
2758
2759         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2760         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2761                                     &resp->p, buflen, getattr->ga_bmval,
2762                                     resp->rqstp, 0);
2763         return nfserr;
2764 }
2765
2766 static __be32
2767 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2768 {
2769         struct svc_fh *fhp = *fhpp;
2770         unsigned int len;
2771         __be32 *p;
2772
2773         if (!nfserr) {
2774                 len = fhp->fh_handle.fh_size;
2775                 RESERVE_SPACE(len + 4);
2776                 WRITE32(len);
2777                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2778                 ADJUST_ARGS();
2779         }
2780         return nfserr;
2781 }
2782
2783 /*
2784 * Including all fields other than the name, a LOCK4denied structure requires
2785 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2786 */
2787 static void
2788 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2789 {
2790         struct xdr_netobj *conf = &ld->ld_owner;
2791         __be32 *p;
2792
2793         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2794         WRITE64(ld->ld_start);
2795         WRITE64(ld->ld_length);
2796         WRITE32(ld->ld_type);
2797         if (conf->len) {
2798                 WRITEMEM(&ld->ld_clientid, 8);
2799                 WRITE32(conf->len);
2800                 WRITEMEM(conf->data, conf->len);
2801                 kfree(conf->data);
2802         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2803                 WRITE64((u64)0); /* clientid */
2804                 WRITE32(0); /* length of owner name */
2805         }
2806         ADJUST_ARGS();
2807 }
2808
2809 static __be32
2810 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2811 {
2812         if (!nfserr)
2813                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2814         else if (nfserr == nfserr_denied)
2815                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2816
2817         return nfserr;
2818 }
2819
2820 static __be32
2821 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2822 {
2823         if (nfserr == nfserr_denied)
2824                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2825         return nfserr;
2826 }
2827
2828 static __be32
2829 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2830 {
2831         if (!nfserr)
2832                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2833
2834         return nfserr;
2835 }
2836
2837
2838 static __be32
2839 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2840 {
2841         __be32 *p;
2842
2843         if (!nfserr) {
2844                 RESERVE_SPACE(20);
2845                 write_cinfo(&p, &link->li_cinfo);
2846                 ADJUST_ARGS();
2847         }
2848         return nfserr;
2849 }
2850
2851
2852 static __be32
2853 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2854 {
2855         __be32 *p;
2856
2857         if (nfserr)
2858                 goto out;
2859
2860         nfsd4_encode_stateid(resp, &open->op_stateid);
2861         RESERVE_SPACE(40);
2862         write_cinfo(&p, &open->op_cinfo);
2863         WRITE32(open->op_rflags);
2864         WRITE32(2);
2865         WRITE32(open->op_bmval[0]);
2866         WRITE32(open->op_bmval[1]);
2867         WRITE32(open->op_delegate_type);
2868         ADJUST_ARGS();
2869
2870         switch (open->op_delegate_type) {
2871         case NFS4_OPEN_DELEGATE_NONE:
2872                 break;
2873         case NFS4_OPEN_DELEGATE_READ:
2874                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2875                 RESERVE_SPACE(20);
2876                 WRITE32(open->op_recall);
2877
2878                 /*
2879                  * TODO: ACE's in delegations
2880                  */
2881                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2882                 WRITE32(0);
2883                 WRITE32(0);
2884                 WRITE32(0);   /* XXX: is NULL principal ok? */
2885                 ADJUST_ARGS();
2886                 break;
2887         case NFS4_OPEN_DELEGATE_WRITE:
2888                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2889                 RESERVE_SPACE(32);
2890                 WRITE32(0);
2891
2892                 /*
2893                  * TODO: space_limit's in delegations
2894                  */
2895                 WRITE32(NFS4_LIMIT_SIZE);
2896                 WRITE32(~(u32)0);
2897                 WRITE32(~(u32)0);
2898
2899                 /*
2900                  * TODO: ACE's in delegations
2901                  */
2902                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2903                 WRITE32(0);
2904                 WRITE32(0);
2905                 WRITE32(0);   /* XXX: is NULL principal ok? */
2906                 ADJUST_ARGS();
2907                 break;
2908         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2909                 switch (open->op_why_no_deleg) {
2910                 case WND4_CONTENTION:
2911                 case WND4_RESOURCE:
2912                         RESERVE_SPACE(8);
2913                         WRITE32(open->op_why_no_deleg);
2914                         WRITE32(0);     /* deleg signaling not supported yet */
2915                         break;
2916                 default:
2917                         RESERVE_SPACE(4);
2918                         WRITE32(open->op_why_no_deleg);
2919                 }
2920                 ADJUST_ARGS();
2921                 break;
2922         default:
2923                 BUG();
2924         }
2925         /* XXX save filehandle here */
2926 out:
2927         return nfserr;
2928 }
2929
2930 static __be32
2931 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2932 {
2933         if (!nfserr)
2934                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2935
2936         return nfserr;
2937 }
2938
2939 static __be32
2940 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2941 {
2942         if (!nfserr)
2943                 nfsd4_encode_stateid(resp, &od->od_stateid);
2944
2945         return nfserr;
2946 }
2947
2948 static __be32
2949 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2950                   struct nfsd4_read *read)
2951 {
2952         u32 eof;
2953         int v;
2954         struct page *page;
2955         unsigned long maxcount;
2956         long len;
2957         __be32 *p;
2958
2959         if (nfserr)
2960                 return nfserr;
2961         if (resp->xbuf->page_len)
2962                 return nfserr_resource;
2963
2964         RESERVE_SPACE(8); /* eof flag and byte count */
2965
2966         maxcount = svc_max_payload(resp->rqstp);
2967         if (maxcount > read->rd_length)
2968                 maxcount = read->rd_length;
2969
2970         len = maxcount;
2971         v = 0;
2972         while (len > 0) {
2973                 page = *(resp->rqstp->rq_next_page);
2974                 if (!page) { /* ran out of pages */
2975                         maxcount -= len;
2976                         break;
2977                 }
2978                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2979                 resp->rqstp->rq_vec[v].iov_len =
2980                         len < PAGE_SIZE ? len : PAGE_SIZE;
2981                 resp->rqstp->rq_next_page++;
2982                 v++;
2983                 len -= PAGE_SIZE;
2984         }
2985         read->rd_vlen = v;
2986
2987         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2988                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2989                         &maxcount);
2990
2991         if (nfserr)
2992                 return nfserr;
2993         eof = (read->rd_offset + maxcount >=
2994                read->rd_fhp->fh_dentry->d_inode->i_size);
2995
2996         WRITE32(eof);
2997         WRITE32(maxcount);
2998         ADJUST_ARGS();
2999         resp->xbuf->head[0].iov_len = (char*)p
3000                                         - (char*)resp->xbuf->head[0].iov_base;
3001         resp->xbuf->page_len = maxcount;
3002
3003         /* Use rest of head for padding and remaining ops: */
3004         resp->xbuf->tail[0].iov_base = p;
3005         resp->xbuf->tail[0].iov_len = 0;
3006         if (maxcount&3) {
3007                 RESERVE_SPACE(4);
3008                 WRITE32(0);
3009                 resp->xbuf->tail[0].iov_base += maxcount&3;
3010                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3011                 ADJUST_ARGS();
3012         }
3013         return 0;
3014 }
3015
3016 static __be32
3017 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3018 {
3019         int maxcount;
3020         char *page;
3021         __be32 *p;
3022
3023         if (nfserr)
3024                 return nfserr;
3025         if (resp->xbuf->page_len)
3026                 return nfserr_resource;
3027         if (!*resp->rqstp->rq_next_page)
3028                 return nfserr_resource;
3029
3030         page = page_address(*(resp->rqstp->rq_next_page++));
3031
3032         maxcount = PAGE_SIZE;
3033         RESERVE_SPACE(4);
3034
3035         /*
3036          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3037          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3038          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3039          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3040          */
3041         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3042         if (nfserr == nfserr_isdir)
3043                 return nfserr_inval;
3044         if (nfserr)
3045                 return nfserr;
3046
3047         WRITE32(maxcount);
3048         ADJUST_ARGS();
3049         resp->xbuf->head[0].iov_len = (char*)p
3050                                 - (char*)resp->xbuf->head[0].iov_base;
3051         resp->xbuf->page_len = maxcount;
3052
3053         /* Use rest of head for padding and remaining ops: */
3054         resp->xbuf->tail[0].iov_base = p;
3055         resp->xbuf->tail[0].iov_len = 0;
3056         if (maxcount&3) {
3057                 RESERVE_SPACE(4);
3058                 WRITE32(0);
3059                 resp->xbuf->tail[0].iov_base += maxcount&3;
3060                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3061                 ADJUST_ARGS();
3062         }
3063         return 0;
3064 }
3065
3066 static __be32
3067 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3068 {
3069         int maxcount;
3070         loff_t offset;
3071         __be32 *page, *savep, *tailbase;
3072         __be32 *p;
3073
3074         if (nfserr)
3075                 return nfserr;
3076         if (resp->xbuf->page_len)
3077                 return nfserr_resource;
3078         if (!*resp->rqstp->rq_next_page)
3079                 return nfserr_resource;
3080
3081         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3082         savep = p;
3083
3084         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3085         WRITE32(0);
3086         WRITE32(0);
3087         ADJUST_ARGS();
3088         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3089         tailbase = p;
3090
3091         maxcount = PAGE_SIZE;
3092         if (maxcount > readdir->rd_maxcount)
3093                 maxcount = readdir->rd_maxcount;
3094
3095         /*
3096          * Convert from bytes to words, account for the two words already
3097          * written, make sure to leave two words at the end for the next
3098          * pointer and eof field.
3099          */
3100         maxcount = (maxcount >> 2) - 4;
3101         if (maxcount < 0) {
3102                 nfserr =  nfserr_toosmall;
3103                 goto err_no_verf;
3104         }
3105
3106         page = page_address(*(resp->rqstp->rq_next_page++));
3107         readdir->common.err = 0;
3108         readdir->buflen = maxcount;
3109         readdir->buffer = page;
3110         readdir->offset = NULL;
3111
3112         offset = readdir->rd_cookie;
3113         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3114                               &offset,
3115                               &readdir->common, nfsd4_encode_dirent);
3116         if (nfserr == nfs_ok &&
3117             readdir->common.err == nfserr_toosmall &&
3118             readdir->buffer == page)
3119                 nfserr = nfserr_toosmall;
3120         if (nfserr)
3121                 goto err_no_verf;
3122
3123         if (readdir->offset)
3124                 xdr_encode_hyper(readdir->offset, offset);
3125
3126         p = readdir->buffer;
3127         *p++ = 0;       /* no more entries */
3128         *p++ = htonl(readdir->common.err == nfserr_eof);
3129         resp->xbuf->page_len = ((char*)p) -
3130                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3131
3132         /* Use rest of head for padding and remaining ops: */
3133         resp->xbuf->tail[0].iov_base = tailbase;
3134         resp->xbuf->tail[0].iov_len = 0;
3135         resp->p = resp->xbuf->tail[0].iov_base;
3136         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3137
3138         return 0;
3139 err_no_verf:
3140         p = savep;
3141         ADJUST_ARGS();
3142         return nfserr;
3143 }
3144
3145 static __be32
3146 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3147 {
3148         __be32 *p;
3149
3150         if (!nfserr) {
3151                 RESERVE_SPACE(20);
3152                 write_cinfo(&p, &remove->rm_cinfo);
3153                 ADJUST_ARGS();
3154         }
3155         return nfserr;
3156 }
3157
3158 static __be32
3159 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3160 {
3161         __be32 *p;
3162
3163         if (!nfserr) {
3164                 RESERVE_SPACE(40);
3165                 write_cinfo(&p, &rename->rn_sinfo);
3166                 write_cinfo(&p, &rename->rn_tinfo);
3167                 ADJUST_ARGS();
3168         }
3169         return nfserr;
3170 }
3171
3172 static __be32
3173 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3174                          __be32 nfserr, struct svc_export *exp)
3175 {
3176         u32 i, nflavs, supported;
3177         struct exp_flavor_info *flavs;
3178         struct exp_flavor_info def_flavs[2];
3179         __be32 *p, *flavorsp;
3180         static bool report = true;
3181
3182         if (nfserr)
3183                 goto out;
3184         if (exp->ex_nflavors) {
3185                 flavs = exp->ex_flavors;
3186                 nflavs = exp->ex_nflavors;
3187         } else { /* Handling of some defaults in absence of real secinfo: */
3188                 flavs = def_flavs;
3189                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3190                         nflavs = 2;
3191                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3192                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3193                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3194                         nflavs = 1;
3195                         flavs[0].pseudoflavor
3196                                         = svcauth_gss_flavor(exp->ex_client);
3197                 } else {
3198                         nflavs = 1;
3199                         flavs[0].pseudoflavor
3200                                         = exp->ex_client->flavour->flavour;
3201                 }
3202         }
3203
3204         supported = 0;
3205         RESERVE_SPACE(4);
3206         flavorsp = p++;         /* to be backfilled later */
3207         ADJUST_ARGS();
3208
3209         for (i = 0; i < nflavs; i++) {
3210                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3211                 struct rpcsec_gss_info info;
3212
3213                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3214                         supported++;
3215                         RESERVE_SPACE(4 + 4 + info.oid.len + 4 + 4);
3216                         WRITE32(RPC_AUTH_GSS);
3217                         WRITE32(info.oid.len);
3218                         WRITEMEM(info.oid.data, info.oid.len);
3219                         WRITE32(info.qop);
3220                         WRITE32(info.service);
3221                         ADJUST_ARGS();
3222                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3223                         supported++;
3224                         RESERVE_SPACE(4);
3225                         WRITE32(pf);
3226                         ADJUST_ARGS();
3227                 } else {
3228                         if (report)
3229                                 pr_warn("NFS: SECINFO: security flavor %u "
3230                                         "is not supported\n", pf);
3231                 }
3232         }
3233
3234         if (nflavs != supported)
3235                 report = false;
3236         *flavorsp = htonl(supported);
3237
3238 out:
3239         if (exp)
3240                 exp_put(exp);
3241         return nfserr;
3242 }
3243
3244 static __be32
3245 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3246                      struct nfsd4_secinfo *secinfo)
3247 {
3248         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3249 }
3250
3251 static __be32
3252 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3253                      struct nfsd4_secinfo_no_name *secinfo)
3254 {
3255         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3256 }
3257
3258 /*
3259  * The SETATTR encode routine is special -- it always encodes a bitmap,
3260  * regardless of the error status.
3261  */
3262 static __be32
3263 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3264 {
3265         __be32 *p;
3266
3267         RESERVE_SPACE(16);
3268         if (nfserr) {
3269                 WRITE32(3);
3270                 WRITE32(0);
3271                 WRITE32(0);
3272                 WRITE32(0);
3273         }
3274         else {
3275                 WRITE32(3);
3276                 WRITE32(setattr->sa_bmval[0]);
3277                 WRITE32(setattr->sa_bmval[1]);
3278                 WRITE32(setattr->sa_bmval[2]);
3279         }
3280         ADJUST_ARGS();
3281         return nfserr;
3282 }
3283
3284 static __be32
3285 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3286 {
3287         __be32 *p;
3288
3289         if (!nfserr) {
3290                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3291                 WRITEMEM(&scd->se_clientid, 8);
3292                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3293                 ADJUST_ARGS();
3294         }
3295         else if (nfserr == nfserr_clid_inuse) {
3296                 RESERVE_SPACE(8);
3297                 WRITE32(0);
3298                 WRITE32(0);
3299                 ADJUST_ARGS();
3300         }
3301         return nfserr;
3302 }
3303
3304 static __be32
3305 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3306 {
3307         __be32 *p;
3308
3309         if (!nfserr) {
3310                 RESERVE_SPACE(16);
3311                 WRITE32(write->wr_bytes_written);
3312                 WRITE32(write->wr_how_written);
3313                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3314                 ADJUST_ARGS();
3315         }
3316         return nfserr;
3317 }
3318
3319 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3320         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3321               1 << (OP_EXCHANGE_ID - 32) |
3322               1 << (OP_CREATE_SESSION - 32) |
3323               1 << (OP_DESTROY_SESSION - 32) |
3324               1 << (OP_DESTROY_CLIENTID - 32)
3325 };
3326
3327 static __be32
3328 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3329                          struct nfsd4_exchange_id *exid)
3330 {
3331         __be32 *p;
3332         char *major_id;
3333         char *server_scope;
3334         int major_id_sz;
3335         int server_scope_sz;
3336         uint64_t minor_id = 0;
3337
3338         if (nfserr)
3339                 return nfserr;
3340
3341         major_id = utsname()->nodename;
3342         major_id_sz = strlen(major_id);
3343         server_scope = utsname()->nodename;
3344         server_scope_sz = strlen(server_scope);
3345
3346         RESERVE_SPACE(
3347                 8 /* eir_clientid */ +
3348                 4 /* eir_sequenceid */ +
3349                 4 /* eir_flags */ +
3350                 4 /* spr_how */ +
3351                 8 /* spo_must_enforce, spo_must_allow */ +
3352                 8 /* so_minor_id */ +
3353                 4 /* so_major_id.len */ +
3354                 (XDR_QUADLEN(major_id_sz) * 4) +
3355                 4 /* eir_server_scope.len */ +
3356                 (XDR_QUADLEN(server_scope_sz) * 4) +
3357                 4 /* eir_server_impl_id.count (0) */);
3358
3359         WRITEMEM(&exid->clientid, 8);
3360         WRITE32(exid->seqid);
3361         WRITE32(exid->flags);
3362
3363         WRITE32(exid->spa_how);
3364         switch (exid->spa_how) {
3365         case SP4_NONE:
3366                 break;
3367         case SP4_MACH_CRED:
3368                 /* spo_must_enforce bitmap: */
3369                 WRITE32(2);
3370                 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3371                 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3372                 /* empty spo_must_allow bitmap: */
3373                 WRITE32(0);
3374                 break;
3375         default:
3376                 WARN_ON_ONCE(1);
3377         }
3378
3379         /* The server_owner struct */
3380         WRITE64(minor_id);      /* Minor id */
3381         /* major id */
3382         WRITE32(major_id_sz);
3383         WRITEMEM(major_id, major_id_sz);
3384
3385         /* Server scope */
3386         WRITE32(server_scope_sz);
3387         WRITEMEM(server_scope, server_scope_sz);
3388
3389         /* Implementation id */
3390         WRITE32(0);     /* zero length nfs_impl_id4 array */
3391         ADJUST_ARGS();
3392         return 0;
3393 }
3394
3395 static __be32
3396 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3397                             struct nfsd4_create_session *sess)
3398 {
3399         __be32 *p;
3400
3401         if (nfserr)
3402                 return nfserr;
3403
3404         RESERVE_SPACE(24);
3405         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3406         WRITE32(sess->seqid);
3407         WRITE32(sess->flags);
3408         ADJUST_ARGS();
3409
3410         RESERVE_SPACE(28);
3411         WRITE32(0); /* headerpadsz */
3412         WRITE32(sess->fore_channel.maxreq_sz);
3413         WRITE32(sess->fore_channel.maxresp_sz);
3414         WRITE32(sess->fore_channel.maxresp_cached);
3415         WRITE32(sess->fore_channel.maxops);
3416         WRITE32(sess->fore_channel.maxreqs);
3417         WRITE32(sess->fore_channel.nr_rdma_attrs);
3418         ADJUST_ARGS();
3419
3420         if (sess->fore_channel.nr_rdma_attrs) {
3421                 RESERVE_SPACE(4);
3422                 WRITE32(sess->fore_channel.rdma_attrs);
3423                 ADJUST_ARGS();
3424         }
3425
3426         RESERVE_SPACE(28);
3427         WRITE32(0); /* headerpadsz */
3428         WRITE32(sess->back_channel.maxreq_sz);
3429         WRITE32(sess->back_channel.maxresp_sz);
3430         WRITE32(sess->back_channel.maxresp_cached);
3431         WRITE32(sess->back_channel.maxops);
3432         WRITE32(sess->back_channel.maxreqs);
3433         WRITE32(sess->back_channel.nr_rdma_attrs);
3434         ADJUST_ARGS();
3435
3436         if (sess->back_channel.nr_rdma_attrs) {
3437                 RESERVE_SPACE(4);
3438                 WRITE32(sess->back_channel.rdma_attrs);
3439                 ADJUST_ARGS();
3440         }
3441         return 0;
3442 }
3443
3444 static __be32
3445 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3446                              struct nfsd4_destroy_session *destroy_session)
3447 {
3448         return nfserr;
3449 }
3450
3451 static __be32
3452 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3453                           struct nfsd4_free_stateid *free_stateid)
3454 {
3455         __be32 *p;
3456
3457         if (nfserr)
3458                 return nfserr;
3459
3460         RESERVE_SPACE(4);
3461         *p++ = nfserr;
3462         ADJUST_ARGS();
3463         return nfserr;
3464 }
3465
3466 static __be32
3467 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3468                       struct nfsd4_sequence *seq)
3469 {
3470         __be32 *p;
3471
3472         if (nfserr)
3473                 return nfserr;
3474
3475         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3476         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3477         WRITE32(seq->seqid);
3478         WRITE32(seq->slotid);
3479         /* Note slotid's are numbered from zero: */
3480         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3481         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3482         WRITE32(seq->status_flags);
3483
3484         ADJUST_ARGS();
3485         resp->cstate.datap = p; /* DRC cache data pointer */
3486         return 0;
3487 }
3488
3489 static __be32
3490 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3491                           struct nfsd4_test_stateid *test_stateid)
3492 {
3493         struct nfsd4_test_stateid_id *stateid, *next;
3494         __be32 *p;
3495
3496         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3497         *p++ = htonl(test_stateid->ts_num_ids);
3498
3499         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3500                 *p++ = stateid->ts_id_status;
3501         }
3502
3503         ADJUST_ARGS();
3504         return nfserr;
3505 }
3506
3507 static __be32
3508 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3509 {
3510         return nfserr;
3511 }
3512
3513 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3514
3515 /*
3516  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3517  * since we don't need to filter out obsolete ops as this is
3518  * done in the decoding phase.
3519  */
3520 static nfsd4_enc nfsd4_enc_ops[] = {
3521         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3522         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3523         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3524         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3525         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3526         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3527         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3528         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3529         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3530         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3531         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3532         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3533         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3534         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3535         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3536         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3537         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3538         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3539         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3540         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3541         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3542         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3543         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3544         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3545         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3546         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3547         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3548         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3549         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3550         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3551         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3552         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3553         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3554         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3555         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3556         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3557         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3558
3559         /* NFSv4.1 operations */
3560         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3561         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3562         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3563         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3564         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3565         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3566         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3567         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3568         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3569         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3570         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3571         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3572         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3573         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3574         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3575         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3576         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3577         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3578         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3579 };
3580
3581 /*
3582  * Calculate the total amount of memory that the compound response has taken
3583  * after encoding the current operation with pad.
3584  *
3585  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3586  *      which was specified at nfsd4_operation, else pad is zero.
3587  *
3588  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3589  *
3590  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3591  * will be at least a page and will therefore hold the xdr_buf head.
3592  */
3593 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3594 {
3595         struct xdr_buf *xb = &resp->rqstp->rq_res;
3596         struct nfsd4_session *session = NULL;
3597         struct nfsd4_slot *slot = resp->cstate.slot;
3598         u32 length, tlen = 0;
3599
3600         if (!nfsd4_has_session(&resp->cstate))
3601                 return 0;
3602
3603         session = resp->cstate.session;
3604         if (session == NULL)
3605                 return 0;
3606
3607         if (xb->page_len == 0) {
3608                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3609         } else {
3610                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3611                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3612
3613                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3614         }
3615         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3616                 length, xb->page_len, tlen, pad);
3617
3618         if (length > session->se_fchannel.maxresp_sz)
3619                 return nfserr_rep_too_big;
3620
3621         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3622             length > session->se_fchannel.maxresp_cached)
3623                 return nfserr_rep_too_big_to_cache;
3624
3625         return 0;
3626 }
3627
3628 void
3629 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3630 {
3631         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3632         __be32 *statp;
3633         __be32 *p;
3634
3635         RESERVE_SPACE(8);
3636         WRITE32(op->opnum);
3637         statp = p++;    /* to be backfilled at the end */
3638         ADJUST_ARGS();
3639
3640         if (op->opnum == OP_ILLEGAL)
3641                 goto status;
3642         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3643                !nfsd4_enc_ops[op->opnum]);
3644         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3645         /* nfsd4_check_drc_limit guarantees enough room for error status */
3646         if (!op->status)
3647                 op->status = nfsd4_check_resp_size(resp, 0);
3648         if (so) {
3649                 so->so_replay.rp_status = op->status;
3650                 so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3651                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3652         }
3653 status:
3654         /*
3655          * Note: We write the status directly, instead of using WRITE32(),
3656          * since it is already in network byte order.
3657          */
3658         *statp = op->status;
3659 }
3660
3661 /*
3662  * Encode the reply stored in the stateowner reply cache
3663  *
3664  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3665  * previously sent already encoded operation.
3666  *
3667  * called with nfs4_lock_state() held
3668  */
3669 void
3670 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3671 {
3672         __be32 *p;
3673         struct nfs4_replay *rp = op->replay;
3674
3675         BUG_ON(!rp);
3676
3677         RESERVE_SPACE(8);
3678         WRITE32(op->opnum);
3679         *p++ = rp->rp_status;  /* already xdr'ed */
3680         ADJUST_ARGS();
3681
3682         RESERVE_SPACE(rp->rp_buflen);
3683         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3684         ADJUST_ARGS();
3685 }
3686
3687 int
3688 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3689 {
3690         return xdr_ressize_check(rqstp, p);
3691 }
3692
3693 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3694 {
3695         struct svc_rqst *rqstp = rq;
3696         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3697
3698         if (args->ops != args->iops) {
3699                 kfree(args->ops);
3700                 args->ops = args->iops;
3701         }
3702         kfree(args->tmpp);
3703         args->tmpp = NULL;
3704         while (args->to_free) {
3705                 struct tmpbuf *tb = args->to_free;
3706                 args->to_free = tb->next;
3707                 tb->release(tb->buf);
3708                 kfree(tb);
3709         }
3710         return 1;
3711 }
3712
3713 int
3714 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3715 {
3716         args->p = p;
3717         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3718         args->pagelist = rqstp->rq_arg.pages;
3719         args->pagelen = rqstp->rq_arg.page_len;
3720         args->tmpp = NULL;
3721         args->to_free = NULL;
3722         args->ops = args->iops;
3723         args->rqstp = rqstp;
3724
3725         return !nfsd4_decode_compound(args);
3726 }
3727
3728 int
3729 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3730 {
3731         /*
3732          * All that remains is to write the tag and operation count...
3733          */
3734         struct nfsd4_compound_state *cs = &resp->cstate;
3735         struct kvec *iov;
3736         p = resp->tagp;
3737         *p++ = htonl(resp->taglen);
3738         memcpy(p, resp->tag, resp->taglen);
3739         p += XDR_QUADLEN(resp->taglen);
3740         *p++ = htonl(resp->opcnt);
3741
3742         if (rqstp->rq_res.page_len)
3743                 iov = &rqstp->rq_res.tail[0];
3744         else
3745                 iov = &rqstp->rq_res.head[0];
3746         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3747         BUG_ON(iov->iov_len > PAGE_SIZE);
3748         if (nfsd4_has_session(cs)) {
3749                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3750                 struct nfs4_client *clp = cs->session->se_client;
3751                 if (cs->status != nfserr_replay_cache) {
3752                         nfsd4_store_cache_entry(resp);
3753                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3754                 }
3755                 /* Renew the clientid on success and on replay */
3756                 spin_lock(&nn->client_lock);
3757                 nfsd4_put_session(cs->session);
3758                 spin_unlock(&nn->client_lock);
3759                 put_client_renew(clp);
3760         }
3761         return 1;
3762 }
3763
3764 /*
3765  * Local variables:
3766  *  c-basic-offset: 8
3767  * End:
3768  */