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 READMEM(x,nbytes) do {                  \
 102         x = (char *)p;                          \
 103         p += XDR_QUADLEN(nbytes);               \
 104 } while (0)
 105 #define SAVEMEM(x,nbytes) do {                  \
 106         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 107                 savemem(argp, p, nbytes) :      \
 108                 (char *)p)) {                   \
 109                 dprintk("NFSD: xdr error (%s:%d)\n", \
 110                                 __FILE__, __LINE__); \
 111                 goto xdr_error;                 \
 112                 }                               \
 113         p += XDR_QUADLEN(nbytes);               \
 114 } while (0)
 115 #define COPYMEM(x,nbytes) do {                  \
 116         memcpy((x), p, nbytes);                 \
 117         p += XDR_QUADLEN(nbytes);               \
 118 } while (0)
 119
 120 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 121 #define READ_BUF(nbytes)  do {                  \
 122         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 123                 p = argp->p;                    \
 124                 argp->p += XDR_QUADLEN(nbytes); \
 125         } else if (!(p = read_buf(argp, nbytes))) { \
 126                 dprintk("NFSD: xdr error (%s:%d)\n", \
 127                                 __FILE__, __LINE__); \
 128                 goto xdr_error;                 \
 129         }                                       \
 130 } while (0)
 131
 132 static void next_decode_page(struct nfsd4_compoundargs *argp)
 133 {
 134         argp->p = page_address(argp->pagelist[0]);
 135         argp->pagelist++;
 136         if (argp->pagelen < PAGE_SIZE) {
 137                 argp->end = argp->p + (argp->pagelen>>2);
 138                 argp->pagelen = 0;
 139         } else {
 140                 argp->end = argp->p + (PAGE_SIZE>>2);
 141                 argp->pagelen -= PAGE_SIZE;
 142         }
 143 }
 144
 145 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 146 {
 147         /* We want more bytes than seem to be available.
 148          * Maybe we need a new page, maybe we have just run out
 149          */
 150         unsigned int avail = (char *)argp->end - (char *)argp->p;
 151         __be32 *p;
 152         if (avail + argp->pagelen < nbytes)
 153                 return NULL;
 154         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 155                 return NULL;
 156         /* ok, we can do it with the current plus the next page */
 157         if (nbytes <= sizeof(argp->tmp))
 158                 p = argp->tmp;
 159         else {
 160                 kfree(argp->tmpp);
 161                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 162                 if (!p)
 163                         return NULL;
 164
 165         }
 166         /*
 167          * The following memcpy is safe because read_buf is always
 168          * called with nbytes > avail, and the two cases above both
 169          * guarantee p points to at least nbytes bytes.
 170          */
 171         memcpy(p, argp->p, avail);
 172         next_decode_page(argp);
 173         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 174         argp->p += XDR_QUADLEN(nbytes - avail);
 175         return p;
 176 }
 177
 178 static int zero_clientid(clientid_t *clid)
 179 {
 180         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 181 }
 182
 183 /**
 184  * defer_free - mark an allocation as deferred freed
 185  * @argp: NFSv4 compound argument structure to be freed with
 186  * @release: release callback to free @p, typically kfree()
 187  * @p: pointer to be freed
 188  *
 189  * Marks @p to be freed when processing the compound operation
 190  * described in @argp finishes.
 191  */
 192 static int
 193 defer_free(struct nfsd4_compoundargs *argp,
 194                 void (*release)(const void *), void *p)
 195 {
 196         struct tmpbuf *tb;
 197
 198         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 199         if (!tb)
 200                 return -ENOMEM;
 201         tb->buf = p;
 202         tb->release = release;
 203         tb->next = argp->to_free;
 204         argp->to_free = tb;
 205         return 0;
 206 }
 207
 208 /**
 209  * savemem - duplicate a chunk of memory for later processing
 210  * @argp: NFSv4 compound argument structure to be freed with
 211  * @p: pointer to be duplicated
 212  * @nbytes: length to be duplicated
 213  *
 214  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 215  * that are preserved until processing of the NFSv4 compound
 216  * operation described by @argp finishes.
 217  */
 218 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 219 {
 220         if (p == argp->tmp) {
 221                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 222                 if (!p)
 223                         return NULL;
 224         } else {
 225                 BUG_ON(p != argp->tmpp);
 226                 argp->tmpp = NULL;
 227         }
 228         if (defer_free(argp, kfree, p)) {
 229                 kfree(p);
 230                 return NULL;
 231         } else
 232                 return (char *)p;
 233 }
 234
 235 static __be32
 236 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 237 {
 238         u32 bmlen;
 239         DECODE_HEAD;
 240
 241         bmval[0] = 0;
 242         bmval[1] = 0;
 243         bmval[2] = 0;
 244
 245         READ_BUF(4);
 246         bmlen = be32_to_cpup(p++);
 247         if (bmlen > 1000)
 248                 goto xdr_error;
 249
 250         READ_BUF(bmlen << 2);
 251         if (bmlen > 0)
 252                 bmval[0] = be32_to_cpup(p++);
 253         if (bmlen > 1)
 254                 bmval[1] = be32_to_cpup(p++);
 255         if (bmlen > 2)
 256                 bmval[2] = be32_to_cpup(p++);
 257
 258         DECODE_TAIL;
 259 }
 260
 261 static __be32
 262 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 263                    struct iattr *iattr, struct nfs4_acl **acl,
 264                    struct xdr_netobj *label)
 265 {
 266         int expected_len, len = 0;
 267         u32 dummy32;
 268         u64 sec;
 269         char *buf;
 270
 271         DECODE_HEAD;
 272         iattr->ia_valid = 0;
 273         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 274                 return status;
 275
 276         READ_BUF(4);
 277         expected_len = be32_to_cpup(p++);
 278
 279         if (bmval[0] & FATTR4_WORD0_SIZE) {
 280                 READ_BUF(8);
 281                 len += 8;
 282                 p = xdr_decode_hyper(p, &iattr->ia_size);
 283                 iattr->ia_valid |= ATTR_SIZE;
 284         }
 285         if (bmval[0] & FATTR4_WORD0_ACL) {
 286                 u32 nace;
 287                 struct nfs4_ace *ace;
 288
 289                 READ_BUF(4); len += 4;
 290                 nace = be32_to_cpup(p++);
 291
 292                 if (nace > NFS4_ACL_MAX)
 293                         return nfserr_fbig;
 294
 295                 *acl = nfs4_acl_new(nace);
 296                 if (*acl == NULL)
 297                         return nfserr_jukebox;
 298
 299                 defer_free(argp, kfree, *acl);
 300
 301                 (*acl)->naces = nace;
 302                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 303                         READ_BUF(16); len += 16;
 304                         ace->type = be32_to_cpup(p++);
 305                         ace->flag = be32_to_cpup(p++);
 306                         ace->access_mask = be32_to_cpup(p++);
 307                         dummy32 = be32_to_cpup(p++);
 308                         READ_BUF(dummy32);
 309                         len += XDR_QUADLEN(dummy32) << 2;
 310                         READMEM(buf, dummy32);
 311                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 312                         status = nfs_ok;
 313                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 314                                 ;
 315                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 316                                 status = nfsd_map_name_to_gid(argp->rqstp,
 317                                                 buf, dummy32, &ace->who_gid);
 318                         else
 319                                 status = nfsd_map_name_to_uid(argp->rqstp,
 320                                                 buf, dummy32, &ace->who_uid);
 321                         if (status)
 322                                 return status;
 323                 }
 324         } else
 325                 *acl = NULL;
 326         if (bmval[1] & FATTR4_WORD1_MODE) {
 327                 READ_BUF(4);
 328                 len += 4;
 329                 iattr->ia_mode = be32_to_cpup(p++);
 330                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 331                 iattr->ia_valid |= ATTR_MODE;
 332         }
 333         if (bmval[1] & FATTR4_WORD1_OWNER) {
 334                 READ_BUF(4);
 335                 len += 4;
 336                 dummy32 = be32_to_cpup(p++);
 337                 READ_BUF(dummy32);
 338                 len += (XDR_QUADLEN(dummy32) << 2);
 339                 READMEM(buf, dummy32);
 340                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 341                         return status;
 342                 iattr->ia_valid |= ATTR_UID;
 343         }
 344         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 345                 READ_BUF(4);
 346                 len += 4;
 347                 dummy32 = be32_to_cpup(p++);
 348                 READ_BUF(dummy32);
 349                 len += (XDR_QUADLEN(dummy32) << 2);
 350                 READMEM(buf, dummy32);
 351                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 352                         return status;
 353                 iattr->ia_valid |= ATTR_GID;
 354         }
 355         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 356                 READ_BUF(4);
 357                 len += 4;
 358                 dummy32 = be32_to_cpup(p++);
 359                 switch (dummy32) {
 360                 case NFS4_SET_TO_CLIENT_TIME:
 361                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 362                            all 32 bits of 'nseconds'. */
 363                         READ_BUF(12);
 364                         len += 12;
 365                         p = xdr_decode_hyper(p, &sec);
 366                         iattr->ia_atime.tv_sec = (time_t)sec;
 367                         iattr->ia_atime.tv_nsec = be32_to_cpup(p++);
 368                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 369                                 return nfserr_inval;
 370                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 371                         break;
 372                 case NFS4_SET_TO_SERVER_TIME:
 373                         iattr->ia_valid |= ATTR_ATIME;
 374                         break;
 375                 default:
 376                         goto xdr_error;
 377                 }
 378         }
 379         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 380                 READ_BUF(4);
 381                 len += 4;
 382                 dummy32 = be32_to_cpup(p++);
 383                 switch (dummy32) {
 384                 case NFS4_SET_TO_CLIENT_TIME:
 385                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 386                            all 32 bits of 'nseconds'. */
 387                         READ_BUF(12);
 388                         len += 12;
 389                         p = xdr_decode_hyper(p, &sec);
 390                         iattr->ia_mtime.tv_sec = sec;
 391                         iattr->ia_mtime.tv_nsec = be32_to_cpup(p++);
 392                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 393                                 return nfserr_inval;
 394                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 395                         break;
 396                 case NFS4_SET_TO_SERVER_TIME:
 397                         iattr->ia_valid |= ATTR_MTIME;
 398                         break;
 399                 default:
 400                         goto xdr_error;
 401                 }
 402         }
 403
 404         label->len = 0;
 405 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 406         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 407                 READ_BUF(4);
 408                 len += 4;
 409                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 410                 READ_BUF(4);
 411                 len += 4;
 412                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 413                 READ_BUF(4);
 414                 len += 4;
 415                 dummy32 = be32_to_cpup(p++);
 416                 READ_BUF(dummy32);
 417                 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 418                         return nfserr_badlabel;
 419                 len += (XDR_QUADLEN(dummy32) << 2);
 420                 READMEM(buf, dummy32);
 421                 label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
 422                 if (!label->data)
 423                         return nfserr_jukebox;
 424                 label->len = dummy32;
 425                 defer_free(argp, kfree, label->data);
 426                 memcpy(label->data, buf, dummy32);
 427         }
 428 #endif
 429
 430         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 431             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 432             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 433                 READ_BUF(expected_len - len);
 434         else if (len != expected_len)
 435                 goto xdr_error;
 436
 437         DECODE_TAIL;
 438 }
 439
 440 static __be32
 441 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 442 {
 443         DECODE_HEAD;
 444
 445         READ_BUF(sizeof(stateid_t));
 446         sid->si_generation = be32_to_cpup(p++);
 447         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 448
 449         DECODE_TAIL;
 450 }
 451
 452 static __be32
 453 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 454 {
 455         DECODE_HEAD;
 456
 457         READ_BUF(4);
 458         access->ac_req_access = be32_to_cpup(p++);
 459
 460         DECODE_TAIL;
 461 }
 462
 463 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 464 {
 465         DECODE_HEAD;
 466         u32 dummy, uid, gid;
 467         char *machine_name;
 468         int i;
 469         int nr_secflavs;
 470
 471         /* callback_sec_params4 */
 472         READ_BUF(4);
 473         nr_secflavs = be32_to_cpup(p++);
 474         if (nr_secflavs)
 475                 cbs->flavor = (u32)(-1);
 476         else
 477                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 478                 cbs->flavor = 0;
 479         for (i = 0; i < nr_secflavs; ++i) {
 480                 READ_BUF(4);
 481                 dummy = be32_to_cpup(p++);
 482                 switch (dummy) {
 483                 case RPC_AUTH_NULL:
 484                         /* Nothing to read */
 485                         if (cbs->flavor == (u32)(-1))
 486                                 cbs->flavor = RPC_AUTH_NULL;
 487                         break;
 488                 case RPC_AUTH_UNIX:
 489                         READ_BUF(8);
 490                         /* stamp */
 491                         dummy = be32_to_cpup(p++);
 492
 493                         /* machine name */
 494                         dummy = be32_to_cpup(p++);
 495                         READ_BUF(dummy);
 496                         SAVEMEM(machine_name, dummy);
 497
 498                         /* uid, gid */
 499                         READ_BUF(8);
 500                         uid = be32_to_cpup(p++);
 501                         gid = be32_to_cpup(p++);
 502
 503                         /* more gids */
 504                         READ_BUF(4);
 505                         dummy = be32_to_cpup(p++);
 506                         READ_BUF(dummy * 4);
 507                         if (cbs->flavor == (u32)(-1)) {
 508                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 509                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 510                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 511                                         cbs->uid = kuid;
 512                                         cbs->gid = kgid;
 513                                         cbs->flavor = RPC_AUTH_UNIX;
 514                                 } else {
 515                                         dprintk("RPC_AUTH_UNIX with invalid"
 516                                                 "uid or gid ignoring!\n");
 517                                 }
 518                         }
 519                         break;
 520                 case RPC_AUTH_GSS:
 521                         dprintk("RPC_AUTH_GSS callback secflavor "
 522                                 "not supported!\n");
 523                         READ_BUF(8);
 524                         /* gcbp_service */
 525                         dummy = be32_to_cpup(p++);
 526                         /* gcbp_handle_from_server */
 527                         dummy = be32_to_cpup(p++);
 528                         READ_BUF(dummy);
 529                         p += XDR_QUADLEN(dummy);
 530                         /* gcbp_handle_from_client */
 531                         READ_BUF(4);
 532                         dummy = be32_to_cpup(p++);
 533                         READ_BUF(dummy);
 534                         break;
 535                 default:
 536                         dprintk("Illegal callback secflavor\n");
 537                         return nfserr_inval;
 538                 }
 539         }
 540         DECODE_TAIL;
 541 }
 542
 543 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 544 {
 545         DECODE_HEAD;
 546
 547         READ_BUF(4);
 548         bc->bc_cb_program = be32_to_cpup(p++);
 549         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 550
 551         DECODE_TAIL;
 552 }
 553
 554 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 555 {
 556         DECODE_HEAD;
 557
 558         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 559         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 560         bcts->dir = be32_to_cpup(p++);
 561         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 562          * could help us figure out we should be using it. */
 563         DECODE_TAIL;
 564 }
 565
 566 static __be32
 567 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 568 {
 569         DECODE_HEAD;
 570
 571         READ_BUF(4);
 572         close->cl_seqid = be32_to_cpup(p++);
 573         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 574
 575         DECODE_TAIL;
 576 }
 577
 578
 579 static __be32
 580 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 581 {
 582         DECODE_HEAD;
 583
 584         READ_BUF(12);
 585         p = xdr_decode_hyper(p, &commit->co_offset);
 586         commit->co_count = be32_to_cpup(p++);
 587
 588         DECODE_TAIL;
 589 }
 590
 591 static __be32
 592 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 593 {
 594         DECODE_HEAD;
 595
 596         READ_BUF(4);
 597         create->cr_type = be32_to_cpup(p++);
 598         switch (create->cr_type) {
 599         case NF4LNK:
 600                 READ_BUF(4);
 601                 create->cr_linklen = be32_to_cpup(p++);
 602                 READ_BUF(create->cr_linklen);
 603                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 604                 break;
 605         case NF4BLK:
 606         case NF4CHR:
 607                 READ_BUF(8);
 608                 create->cr_specdata1 = be32_to_cpup(p++);
 609                 create->cr_specdata2 = be32_to_cpup(p++);
 610                 break;
 611         case NF4SOCK:
 612         case NF4FIFO:
 613         case NF4DIR:
 614         default:
 615                 break;
 616         }
 617
 618         READ_BUF(4);
 619         create->cr_namelen = be32_to_cpup(p++);
 620         READ_BUF(create->cr_namelen);
 621         SAVEMEM(create->cr_name, create->cr_namelen);
 622         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 623                 return status;
 624
 625         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 626                                     &create->cr_acl, &create->cr_label);
 627         if (status)
 628                 goto out;
 629
 630         DECODE_TAIL;
 631 }
 632
 633 static inline __be32
 634 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 635 {
 636         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 637 }
 638
 639 static inline __be32
 640 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 641 {
 642         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 643 }
 644
 645 static __be32
 646 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 647 {
 648         DECODE_HEAD;
 649
 650         READ_BUF(4);
 651         link->li_namelen = be32_to_cpup(p++);
 652         READ_BUF(link->li_namelen);
 653         SAVEMEM(link->li_name, link->li_namelen);
 654         if ((status = check_filename(link->li_name, link->li_namelen)))
 655                 return status;
 656
 657         DECODE_TAIL;
 658 }
 659
 660 static __be32
 661 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 662 {
 663         DECODE_HEAD;
 664
 665         /*
 666         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 667         */
 668         READ_BUF(28);
 669         lock->lk_type = be32_to_cpup(p++);
 670         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 671                 goto xdr_error;
 672         lock->lk_reclaim = be32_to_cpup(p++);
 673         p = xdr_decode_hyper(p, &lock->lk_offset);
 674         p = xdr_decode_hyper(p, &lock->lk_length);
 675         lock->lk_is_new = be32_to_cpup(p++);
 676
 677         if (lock->lk_is_new) {
 678                 READ_BUF(4);
 679                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 680                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 681                 if (status)
 682                         return status;
 683                 READ_BUF(8 + sizeof(clientid_t));
 684                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 685                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 686                 lock->lk_new_owner.len = be32_to_cpup(p++);
 687                 READ_BUF(lock->lk_new_owner.len);
 688                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 689         } else {
 690                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 691                 if (status)
 692                         return status;
 693                 READ_BUF(4);
 694                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 695         }
 696
 697         DECODE_TAIL;
 698 }
 699
 700 static __be32
 701 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 702 {
 703         DECODE_HEAD;
 704
 705         READ_BUF(32);
 706         lockt->lt_type = be32_to_cpup(p++);
 707         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 708                 goto xdr_error;
 709         p = xdr_decode_hyper(p, &lockt->lt_offset);
 710         p = xdr_decode_hyper(p, &lockt->lt_length);
 711         COPYMEM(&lockt->lt_clientid, 8);
 712         lockt->lt_owner.len = be32_to_cpup(p++);
 713         READ_BUF(lockt->lt_owner.len);
 714         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 715
 716         DECODE_TAIL;
 717 }
 718
 719 static __be32
 720 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 721 {
 722         DECODE_HEAD;
 723
 724         READ_BUF(8);
 725         locku->lu_type = be32_to_cpup(p++);
 726         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 727                 goto xdr_error;
 728         locku->lu_seqid = be32_to_cpup(p++);
 729         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 730         if (status)
 731                 return status;
 732         READ_BUF(16);
 733         p = xdr_decode_hyper(p, &locku->lu_offset);
 734         p = xdr_decode_hyper(p, &locku->lu_length);
 735
 736         DECODE_TAIL;
 737 }
 738
 739 static __be32
 740 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 741 {
 742         DECODE_HEAD;
 743
 744         READ_BUF(4);
 745         lookup->lo_len = be32_to_cpup(p++);
 746         READ_BUF(lookup->lo_len);
 747         SAVEMEM(lookup->lo_name, lookup->lo_len);
 748         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 749                 return status;
 750
 751         DECODE_TAIL;
 752 }
 753
 754 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 755 {
 756         __be32 *p;
 757         u32 w;
 758
 759         READ_BUF(4);
 760         w = be32_to_cpup(p++);
 761         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 762         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 763         if (deleg_when)
 764                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 765
 766         switch (w & NFS4_SHARE_ACCESS_MASK) {
 767         case NFS4_SHARE_ACCESS_READ:
 768         case NFS4_SHARE_ACCESS_WRITE:
 769         case NFS4_SHARE_ACCESS_BOTH:
 770                 break;
 771         default:
 772                 return nfserr_bad_xdr;
 773         }
 774         w &= ~NFS4_SHARE_ACCESS_MASK;
 775         if (!w)
 776                 return nfs_ok;
 777         if (!argp->minorversion)
 778                 return nfserr_bad_xdr;
 779         switch (w & NFS4_SHARE_WANT_MASK) {
 780         case NFS4_SHARE_WANT_NO_PREFERENCE:
 781         case NFS4_SHARE_WANT_READ_DELEG:
 782         case NFS4_SHARE_WANT_WRITE_DELEG:
 783         case NFS4_SHARE_WANT_ANY_DELEG:
 784         case NFS4_SHARE_WANT_NO_DELEG:
 785         case NFS4_SHARE_WANT_CANCEL:
 786                 break;
 787         default:
 788                 return nfserr_bad_xdr;
 789         }
 790         w &= ~NFS4_SHARE_WANT_MASK;
 791         if (!w)
 792                 return nfs_ok;
 793
 794         if (!deleg_when)        /* open_downgrade */
 795                 return nfserr_inval;
 796         switch (w) {
 797         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 798         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 799         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 800               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 801                 return nfs_ok;
 802         }
 803 xdr_error:
 804         return nfserr_bad_xdr;
 805 }
 806
 807 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 808 {
 809         __be32 *p;
 810
 811         READ_BUF(4);
 812         *x = be32_to_cpup(p++);
 813         /* Note: unlinke access bits, deny bits may be zero. */
 814         if (*x & ~NFS4_SHARE_DENY_BOTH)
 815                 return nfserr_bad_xdr;
 816         return nfs_ok;
 817 xdr_error:
 818         return nfserr_bad_xdr;
 819 }
 820
 821 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 822 {
 823         __be32 *p;
 824
 825         READ_BUF(4);
 826         o->len = be32_to_cpup(p++);
 827
 828         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 829                 return nfserr_bad_xdr;
 830
 831         READ_BUF(o->len);
 832         SAVEMEM(o->data, o->len);
 833         return nfs_ok;
 834 xdr_error:
 835         return nfserr_bad_xdr;
 836 }
 837
 838 static __be32
 839 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 840 {
 841         DECODE_HEAD;
 842         u32 dummy;
 843
 844         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 845         open->op_iattr.ia_valid = 0;
 846         open->op_openowner = NULL;
 847
 848         open->op_xdr_error = 0;
 849         /* seqid, share_access, share_deny, clientid, ownerlen */
 850         READ_BUF(4);
 851         open->op_seqid = be32_to_cpup(p++);
 852         /* decode, yet ignore deleg_when until supported */
 853         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 854                                            &open->op_deleg_want, &dummy);
 855         if (status)
 856                 goto xdr_error;
 857         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 858         if (status)
 859                 goto xdr_error;
 860         READ_BUF(sizeof(clientid_t));
 861         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 862         status = nfsd4_decode_opaque(argp, &open->op_owner);
 863         if (status)
 864                 goto xdr_error;
 865         READ_BUF(4);
 866         open->op_create = be32_to_cpup(p++);
 867         switch (open->op_create) {
 868         case NFS4_OPEN_NOCREATE:
 869                 break;
 870         case NFS4_OPEN_CREATE:
 871                 READ_BUF(4);
 872                 open->op_createmode = be32_to_cpup(p++);
 873                 switch (open->op_createmode) {
 874                 case NFS4_CREATE_UNCHECKED:
 875                 case NFS4_CREATE_GUARDED:
 876                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 877                                 &open->op_iattr, &open->op_acl, &open->op_label);
 878                         if (status)
 879                                 goto out;
 880                         break;
 881                 case NFS4_CREATE_EXCLUSIVE:
 882                         READ_BUF(NFS4_VERIFIER_SIZE);
 883                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 884                         break;
 885                 case NFS4_CREATE_EXCLUSIVE4_1:
 886                         if (argp->minorversion < 1)
 887                                 goto xdr_error;
 888                         READ_BUF(NFS4_VERIFIER_SIZE);
 889                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 890                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 891                                 &open->op_iattr, &open->op_acl, &open->op_label);
 892                         if (status)
 893                                 goto out;
 894                         break;
 895                 default:
 896                         goto xdr_error;
 897                 }
 898                 break;
 899         default:
 900                 goto xdr_error;
 901         }
 902
 903         /* open_claim */
 904         READ_BUF(4);
 905         open->op_claim_type = be32_to_cpup(p++);
 906         switch (open->op_claim_type) {
 907         case NFS4_OPEN_CLAIM_NULL:
 908         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 909                 READ_BUF(4);
 910                 open->op_fname.len = be32_to_cpup(p++);
 911                 READ_BUF(open->op_fname.len);
 912                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 913                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 914                         return status;
 915                 break;
 916         case NFS4_OPEN_CLAIM_PREVIOUS:
 917                 READ_BUF(4);
 918                 open->op_delegate_type = be32_to_cpup(p++);
 919                 break;
 920         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 921                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 922                 if (status)
 923                         return status;
 924                 READ_BUF(4);
 925                 open->op_fname.len = be32_to_cpup(p++);
 926                 READ_BUF(open->op_fname.len);
 927                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 928                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 929                         return status;
 930                 break;
 931         case NFS4_OPEN_CLAIM_FH:
 932         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 933                 if (argp->minorversion < 1)
 934                         goto xdr_error;
 935                 /* void */
 936                 break;
 937         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 938                 if (argp->minorversion < 1)
 939                         goto xdr_error;
 940                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 941                 if (status)
 942                         return status;
 943                 break;
 944         default:
 945                 goto xdr_error;
 946         }
 947
 948         DECODE_TAIL;
 949 }
 950
 951 static __be32
 952 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 953 {
 954         DECODE_HEAD;
 955
 956         if (argp->minorversion >= 1)
 957                 return nfserr_notsupp;
 958
 959         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 960         if (status)
 961                 return status;
 962         READ_BUF(4);
 963         open_conf->oc_seqid = be32_to_cpup(p++);
 964
 965         DECODE_TAIL;
 966 }
 967
 968 static __be32
 969 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 970 {
 971         DECODE_HEAD;
 972
 973         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 974         if (status)
 975                 return status;
 976         READ_BUF(4);
 977         open_down->od_seqid = be32_to_cpup(p++);
 978         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 979                                            &open_down->od_deleg_want, NULL);
 980         if (status)
 981                 return status;
 982         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 983         if (status)
 984                 return status;
 985         DECODE_TAIL;
 986 }
 987
 988 static __be32
 989 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 990 {
 991         DECODE_HEAD;
 992
 993         READ_BUF(4);
 994         putfh->pf_fhlen = be32_to_cpup(p++);
 995         if (putfh->pf_fhlen > NFS4_FHSIZE)
 996                 goto xdr_error;
 997         READ_BUF(putfh->pf_fhlen);
 998         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 999
1000         DECODE_TAIL;
1001 }
1002
1003 static __be32
1004 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1005 {
1006         if (argp->minorversion == 0)
1007                 return nfs_ok;
1008         return nfserr_notsupp;
1009 }
1010
1011 static __be32
1012 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1013 {
1014         DECODE_HEAD;
1015
1016         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1017         if (status)
1018                 return status;
1019         READ_BUF(12);
1020         p = xdr_decode_hyper(p, &read->rd_offset);
1021         read->rd_length = be32_to_cpup(p++);
1022
1023         DECODE_TAIL;
1024 }
1025
1026 static __be32
1027 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1028 {
1029         DECODE_HEAD;
1030
1031         READ_BUF(24);
1032         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1033         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1034         readdir->rd_dircount = be32_to_cpup(p++);
1035         readdir->rd_maxcount = be32_to_cpup(p++);
1036         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1037                 goto out;
1038
1039         DECODE_TAIL;
1040 }
1041
1042 static __be32
1043 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1044 {
1045         DECODE_HEAD;
1046
1047         READ_BUF(4);
1048         remove->rm_namelen = be32_to_cpup(p++);
1049         READ_BUF(remove->rm_namelen);
1050         SAVEMEM(remove->rm_name, remove->rm_namelen);
1051         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1052                 return status;
1053
1054         DECODE_TAIL;
1055 }
1056
1057 static __be32
1058 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1059 {
1060         DECODE_HEAD;
1061
1062         READ_BUF(4);
1063         rename->rn_snamelen = be32_to_cpup(p++);
1064         READ_BUF(rename->rn_snamelen + 4);
1065         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1066         rename->rn_tnamelen = be32_to_cpup(p++);
1067         READ_BUF(rename->rn_tnamelen);
1068         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1069         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1070                 return status;
1071         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1072                 return status;
1073
1074         DECODE_TAIL;
1075 }
1076
1077 static __be32
1078 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1079 {
1080         DECODE_HEAD;
1081
1082         if (argp->minorversion >= 1)
1083                 return nfserr_notsupp;
1084
1085         READ_BUF(sizeof(clientid_t));
1086         COPYMEM(clientid, sizeof(clientid_t));
1087
1088         DECODE_TAIL;
1089 }
1090
1091 static __be32
1092 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1093                      struct nfsd4_secinfo *secinfo)
1094 {
1095         DECODE_HEAD;
1096
1097         READ_BUF(4);
1098         secinfo->si_namelen = be32_to_cpup(p++);
1099         READ_BUF(secinfo->si_namelen);
1100         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1101         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1102         if (status)
1103                 return status;
1104         DECODE_TAIL;
1105 }
1106
1107 static __be32
1108 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1109                      struct nfsd4_secinfo_no_name *sin)
1110 {
1111         DECODE_HEAD;
1112
1113         READ_BUF(4);
1114         sin->sin_style = be32_to_cpup(p++);
1115         DECODE_TAIL;
1116 }
1117
1118 static __be32
1119 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1120 {
1121         __be32 status;
1122
1123         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1124         if (status)
1125                 return status;
1126         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1127                                   &setattr->sa_acl, &setattr->sa_label);
1128 }
1129
1130 static __be32
1131 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1132 {
1133         DECODE_HEAD;
1134
1135         if (argp->minorversion >= 1)
1136                 return nfserr_notsupp;
1137
1138         READ_BUF(NFS4_VERIFIER_SIZE);
1139         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1140
1141         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1142         if (status)
1143                 return nfserr_bad_xdr;
1144         READ_BUF(8);
1145         setclientid->se_callback_prog = be32_to_cpup(p++);
1146         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1147
1148         READ_BUF(setclientid->se_callback_netid_len + 4);
1149         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1150         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1151
1152         READ_BUF(setclientid->se_callback_addr_len + 4);
1153         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1154         setclientid->se_callback_ident = be32_to_cpup(p++);
1155
1156         DECODE_TAIL;
1157 }
1158
1159 static __be32
1160 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1161 {
1162         DECODE_HEAD;
1163
1164         if (argp->minorversion >= 1)
1165                 return nfserr_notsupp;
1166
1167         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1168         COPYMEM(&scd_c->sc_clientid, 8);
1169         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1170
1171         DECODE_TAIL;
1172 }
1173
1174 /* Also used for NVERIFY */
1175 static __be32
1176 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1177 {
1178         DECODE_HEAD;
1179
1180         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1181                 goto out;
1182
1183         /* For convenience's sake, we compare raw xdr'd attributes in
1184          * nfsd4_proc_verify */
1185
1186         READ_BUF(4);
1187         verify->ve_attrlen = be32_to_cpup(p++);
1188         READ_BUF(verify->ve_attrlen);
1189         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1190
1191         DECODE_TAIL;
1192 }
1193
1194 static __be32
1195 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1196 {
1197         int avail;
1198         int len;
1199         DECODE_HEAD;
1200
1201         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1202         if (status)
1203                 return status;
1204         READ_BUF(16);
1205         p = xdr_decode_hyper(p, &write->wr_offset);
1206         write->wr_stable_how = be32_to_cpup(p++);
1207         if (write->wr_stable_how > 2)
1208                 goto xdr_error;
1209         write->wr_buflen = be32_to_cpup(p++);
1210
1211         /* Sorry .. no magic macros for this.. *
1212          * READ_BUF(write->wr_buflen);
1213          * SAVEMEM(write->wr_buf, write->wr_buflen);
1214          */
1215         avail = (char*)argp->end - (char*)argp->p;
1216         if (avail + argp->pagelen < write->wr_buflen) {
1217                 dprintk("NFSD: xdr error (%s:%d)\n",
1218                                 __FILE__, __LINE__);
1219                 goto xdr_error;
1220         }
1221         write->wr_head.iov_base = p;
1222         write->wr_head.iov_len = avail;
1223         write->wr_pagelist = argp->pagelist;
1224
1225         len = XDR_QUADLEN(write->wr_buflen) << 2;
1226         if (len >= avail) {
1227                 int pages;
1228
1229                 len -= avail;
1230
1231                 pages = len >> PAGE_SHIFT;
1232                 argp->pagelist += pages;
1233                 argp->pagelen -= pages * PAGE_SIZE;
1234                 len -= pages * PAGE_SIZE;
1235
1236                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1237                 argp->pagelist++;
1238                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1239         }
1240         argp->p += XDR_QUADLEN(len);
1241
1242         DECODE_TAIL;
1243 }
1244
1245 static __be32
1246 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1247 {
1248         DECODE_HEAD;
1249
1250         if (argp->minorversion >= 1)
1251                 return nfserr_notsupp;
1252
1253         READ_BUF(12);
1254         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1255         rlockowner->rl_owner.len = be32_to_cpup(p++);
1256         READ_BUF(rlockowner->rl_owner.len);
1257         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1258
1259         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1260                 return nfserr_inval;
1261         DECODE_TAIL;
1262 }
1263
1264 static __be32
1265 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1266                          struct nfsd4_exchange_id *exid)
1267 {
1268         int dummy, tmp;
1269         DECODE_HEAD;
1270
1271         READ_BUF(NFS4_VERIFIER_SIZE);
1272         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1273
1274         status = nfsd4_decode_opaque(argp, &exid->clname);
1275         if (status)
1276                 return nfserr_bad_xdr;
1277
1278         READ_BUF(4);
1279         exid->flags = be32_to_cpup(p++);
1280
1281         /* Ignore state_protect4_a */
1282         READ_BUF(4);
1283         exid->spa_how = be32_to_cpup(p++);
1284         switch (exid->spa_how) {
1285         case SP4_NONE:
1286                 break;
1287         case SP4_MACH_CRED:
1288                 /* spo_must_enforce */
1289                 READ_BUF(4);
1290                 dummy = be32_to_cpup(p++);
1291                 READ_BUF(dummy * 4);
1292                 p += dummy;
1293
1294                 /* spo_must_allow */
1295                 READ_BUF(4);
1296                 dummy = be32_to_cpup(p++);
1297                 READ_BUF(dummy * 4);
1298                 p += dummy;
1299                 break;
1300         case SP4_SSV:
1301                 /* ssp_ops */
1302                 READ_BUF(4);
1303                 dummy = be32_to_cpup(p++);
1304                 READ_BUF(dummy * 4);
1305                 p += dummy;
1306
1307                 READ_BUF(4);
1308                 dummy = be32_to_cpup(p++);
1309                 READ_BUF(dummy * 4);
1310                 p += dummy;
1311
1312                 /* ssp_hash_algs<> */
1313                 READ_BUF(4);
1314                 tmp = be32_to_cpup(p++);
1315                 while (tmp--) {
1316                         READ_BUF(4);
1317                         dummy = be32_to_cpup(p++);
1318                         READ_BUF(dummy);
1319                         p += XDR_QUADLEN(dummy);
1320                 }
1321
1322                 /* ssp_encr_algs<> */
1323                 READ_BUF(4);
1324                 tmp = be32_to_cpup(p++);
1325                 while (tmp--) {
1326                         READ_BUF(4);
1327                         dummy = be32_to_cpup(p++);
1328                         READ_BUF(dummy);
1329                         p += XDR_QUADLEN(dummy);
1330                 }
1331
1332                 /* ssp_window and ssp_num_gss_handles */
1333                 READ_BUF(8);
1334                 dummy = be32_to_cpup(p++);
1335                 dummy = be32_to_cpup(p++);
1336                 break;
1337         default:
1338                 goto xdr_error;
1339         }
1340
1341         /* Ignore Implementation ID */
1342         READ_BUF(4);    /* nfs_impl_id4 array length */
1343         dummy = be32_to_cpup(p++);
1344
1345         if (dummy > 1)
1346                 goto xdr_error;
1347
1348         if (dummy == 1) {
1349                 /* nii_domain */
1350                 READ_BUF(4);
1351                 dummy = be32_to_cpup(p++);
1352                 READ_BUF(dummy);
1353                 p += XDR_QUADLEN(dummy);
1354
1355                 /* nii_name */
1356                 READ_BUF(4);
1357                 dummy = be32_to_cpup(p++);
1358                 READ_BUF(dummy);
1359                 p += XDR_QUADLEN(dummy);
1360
1361                 /* nii_date */
1362                 READ_BUF(12);
1363                 p += 3;
1364         }
1365         DECODE_TAIL;
1366 }
1367
1368 static __be32
1369 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1370                             struct nfsd4_create_session *sess)
1371 {
1372         DECODE_HEAD;
1373         u32 dummy;
1374
1375         READ_BUF(16);
1376         COPYMEM(&sess->clientid, 8);
1377         sess->seqid = be32_to_cpup(p++);
1378         sess->flags = be32_to_cpup(p++);
1379
1380         /* Fore channel attrs */
1381         READ_BUF(28);
1382         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1383         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1384         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1385         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1386         sess->fore_channel.maxops = be32_to_cpup(p++);
1387         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1388         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1389         if (sess->fore_channel.nr_rdma_attrs == 1) {
1390                 READ_BUF(4);
1391                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1392         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1393                 dprintk("Too many fore channel attr bitmaps!\n");
1394                 goto xdr_error;
1395         }
1396
1397         /* Back channel attrs */
1398         READ_BUF(28);
1399         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1400         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1401         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1402         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1403         sess->back_channel.maxops = be32_to_cpup(p++);
1404         sess->back_channel.maxreqs = be32_to_cpup(p++);
1405         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1406         if (sess->back_channel.nr_rdma_attrs == 1) {
1407                 READ_BUF(4);
1408                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1409         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1410                 dprintk("Too many back channel attr bitmaps!\n");
1411                 goto xdr_error;
1412         }
1413
1414         READ_BUF(4);
1415         sess->callback_prog = be32_to_cpup(p++);
1416         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1417         DECODE_TAIL;
1418 }
1419
1420 static __be32
1421 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1422                              struct nfsd4_destroy_session *destroy_session)
1423 {
1424         DECODE_HEAD;
1425         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1426         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1427
1428         DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1433                           struct nfsd4_free_stateid *free_stateid)
1434 {
1435         DECODE_HEAD;
1436
1437         READ_BUF(sizeof(stateid_t));
1438         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1439         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1440
1441         DECODE_TAIL;
1442 }
1443
1444 static __be32
1445 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1446                       struct nfsd4_sequence *seq)
1447 {
1448         DECODE_HEAD;
1449
1450         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1451         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1452         seq->seqid = be32_to_cpup(p++);
1453         seq->slotid = be32_to_cpup(p++);
1454         seq->maxslots = be32_to_cpup(p++);
1455         seq->cachethis = be32_to_cpup(p++);
1456
1457         DECODE_TAIL;
1458 }
1459
1460 static __be32
1461 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1462 {
1463         int i;
1464         __be32 *p, status;
1465         struct nfsd4_test_stateid_id *stateid;
1466
1467         READ_BUF(4);
1468         test_stateid->ts_num_ids = ntohl(*p++);
1469
1470         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1471
1472         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1473                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1474                 if (!stateid) {
1475                         status = nfserrno(-ENOMEM);
1476                         goto out;
1477                 }
1478
1479                 defer_free(argp, kfree, stateid);
1480                 INIT_LIST_HEAD(&stateid->ts_id_list);
1481                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1482
1483                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1484                 if (status)
1485                         goto out;
1486         }
1487
1488         status = 0;
1489 out:
1490         return status;
1491 xdr_error:
1492         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1493         status = nfserr_bad_xdr;
1494         goto out;
1495 }
1496
1497 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1498 {
1499         DECODE_HEAD;
1500
1501         READ_BUF(8);
1502         COPYMEM(&dc->clientid, 8);
1503
1504         DECODE_TAIL;
1505 }
1506
1507 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1508 {
1509         DECODE_HEAD;
1510
1511         READ_BUF(4);
1512         rc->rca_one_fs = be32_to_cpup(p++);
1513
1514         DECODE_TAIL;
1515 }
1516
1517 static __be32
1518 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1519 {
1520         return nfs_ok;
1521 }
1522
1523 static __be32
1524 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1525 {
1526         return nfserr_notsupp;
1527 }
1528
1529 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1530
1531 static nfsd4_dec nfsd4_dec_ops[] = {
1532         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1533         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1534         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1535         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1536         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1537         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1538         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1539         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1540         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1541         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1542         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1543         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1544         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1545         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1546         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1547         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1548         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1549         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1550         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1551         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1552         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1553         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1554         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1555         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1556         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1557         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1558         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1559         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1560         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1561         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1562         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1563         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1564         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1565         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1566         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1567         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1568         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1569
1570         /* new operations for NFSv4.1 */
1571         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1572         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1573         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1574         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1575         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1576         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1577         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1578         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1579         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1580         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1581         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1582         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1583         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1584         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1585         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1586         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1587         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1588         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1589         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1590 };
1591
1592 static inline bool
1593 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1594 {
1595         if (op->opnum < FIRST_NFS4_OP)
1596                 return false;
1597         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1598                 return false;
1599         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1600                 return false;
1601         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1602                 return false;
1603         return true;
1604 }
1605
1606 static __be32
1607 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1608 {
1609         DECODE_HEAD;
1610         struct nfsd4_op *op;
1611         bool cachethis = false;
1612         int auth_slack= argp->rqstp->rq_auth_slack;
1613         int max_reply = auth_slack + 8; /* opcnt, status */
1614         int readcount = 0;
1615         int readbytes = 0;
1616         int i;
1617
1618         READ_BUF(4);
1619         argp->taglen = be32_to_cpup(p++);
1620         READ_BUF(argp->taglen + 8);
1621         SAVEMEM(argp->tag, argp->taglen);
1622         argp->minorversion = be32_to_cpup(p++);
1623         argp->opcnt = be32_to_cpup(p++);
1624         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1625
1626         if (argp->taglen > NFSD4_MAX_TAGLEN)
1627                 goto xdr_error;
1628         if (argp->opcnt > 100)
1629                 goto xdr_error;
1630
1631         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1632                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1633                 if (!argp->ops) {
1634                         argp->ops = argp->iops;
1635                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1636                         goto xdr_error;
1637                 }
1638         }
1639
1640         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1641                 argp->opcnt = 0;
1642
1643         for (i = 0; i < argp->opcnt; i++) {
1644                 op = &argp->ops[i];
1645                 op->replay = NULL;
1646
1647                 READ_BUF(4);
1648                 op->opnum = be32_to_cpup(p++);
1649
1650                 if (nfsd4_opnum_in_range(argp, op))
1651                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1652                 else {
1653                         op->opnum = OP_ILLEGAL;
1654                         op->status = nfserr_op_illegal;
1655                 }
1656                 /*
1657                  * We'll try to cache the result in the DRC if any one
1658                  * op in the compound wants to be cached:
1659                  */
1660                 cachethis |= nfsd4_cache_this_op(op);
1661
1662                 if (op->opnum == OP_READ) {
1663                         readcount++;
1664                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1665                 } else
1666                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1667
1668                 if (op->status) {
1669                         argp->opcnt = i+1;
1670                         break;
1671                 }
1672         }
1673         /* Sessions make the DRC unnecessary: */
1674         if (argp->minorversion)
1675                 cachethis = false;
1676         svc_reserve(argp->rqstp, max_reply + readbytes);
1677         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1678
1679         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1680                 argp->rqstp->rq_splice_ok = false;
1681
1682         DECODE_TAIL;
1683 }
1684
1685 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1686 {
1687         if (IS_I_VERSION(inode)) {
1688                 p = xdr_encode_hyper(p, inode->i_version);
1689         } else {
1690                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1691                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1692         }
1693         return p;
1694 }
1695
1696 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1697 {
1698         *p++ = cpu_to_be32(c->atomic);
1699         if (c->change_supported) {
1700                 p = xdr_encode_hyper(p, c->before_change);
1701                 p = xdr_encode_hyper(p, c->after_change);
1702         } else {
1703                 *p++ = cpu_to_be32(c->before_ctime_sec);
1704                 *p++ = cpu_to_be32(c->before_ctime_nsec);
1705                 *p++ = cpu_to_be32(c->after_ctime_sec);
1706                 *p++ = cpu_to_be32(c->after_ctime_nsec);
1707         }
1708         return p;
1709 }
1710
1711 /* Encode as an array of strings the string given with components
1712  * separated @sep, escaped with esc_enter and esc_exit.
1713  */
1714 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1715                                           char *components, char esc_enter,
1716                                           char esc_exit)
1717 {
1718         __be32 *p;
1719         __be32 pathlen;
1720         int pathlen_offset;
1721         int strlen, count=0;
1722         char *str, *end, *next;
1723
1724         dprintk("nfsd4_encode_components(%s)\n", components);
1725
1726         pathlen_offset = xdr->buf->len;
1727         p = xdr_reserve_space(xdr, 4);
1728         if (!p)
1729                 return nfserr_resource;
1730         p++; /* We will fill this in with @count later */
1731
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                         p = xdr_reserve_space(xdr, strlen + 4);
1754                         if (!p)
1755                                 return nfserr_resource;
1756                         p = xdr_encode_opaque(p, str, strlen);
1757                         count++;
1758                 }
1759                 else
1760                         end++;
1761                 str = end;
1762         }
1763         pathlen = htonl(xdr->buf->len - pathlen_offset);
1764         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1765         return 0;
1766 }
1767
1768 /* Encode as an array of strings the string given with components
1769  * separated @sep.
1770  */
1771 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1772                                       char *components)
1773 {
1774         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1775 }
1776
1777 /*
1778  * encode a location element of a fs_locations structure
1779  */
1780 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1781                                         struct nfsd4_fs_location *location)
1782 {
1783         __be32 status;
1784
1785         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1786                                                 '[', ']');
1787         if (status)
1788                 return status;
1789         status = nfsd4_encode_components(xdr, '/', location->path);
1790         if (status)
1791                 return status;
1792         return 0;
1793 }
1794
1795 /*
1796  * Encode a path in RFC3530 'pathname4' format
1797  */
1798 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1799                                 const struct path *root,
1800                                 const struct path *path)
1801 {
1802         struct path cur = *path;
1803         __be32 *p;
1804         struct dentry **components = NULL;
1805         unsigned int ncomponents = 0;
1806         __be32 err = nfserr_jukebox;
1807
1808         dprintk("nfsd4_encode_components(");
1809
1810         path_get(&cur);
1811         /* First walk the path up to the nfsd root, and store the
1812          * dentries/path components in an array.
1813          */
1814         for (;;) {
1815                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1816                         break;
1817                 if (cur.dentry == cur.mnt->mnt_root) {
1818                         if (follow_up(&cur))
1819                                 continue;
1820                         goto out_free;
1821                 }
1822                 if ((ncomponents & 15) == 0) {
1823                         struct dentry **new;
1824                         new = krealloc(components,
1825                                         sizeof(*new) * (ncomponents + 16),
1826                                         GFP_KERNEL);
1827                         if (!new)
1828                                 goto out_free;
1829                         components = new;
1830                 }
1831                 components[ncomponents++] = cur.dentry;
1832                 cur.dentry = dget_parent(cur.dentry);
1833         }
1834         err = nfserr_resource;
1835         p = xdr_reserve_space(xdr, 4);
1836         if (!p)
1837                 goto out_free;
1838         *p++ = cpu_to_be32(ncomponents);
1839
1840         while (ncomponents) {
1841                 struct dentry *dentry = components[ncomponents - 1];
1842                 unsigned int len;
1843
1844                 spin_lock(&dentry->d_lock);
1845                 len = dentry->d_name.len;
1846                 p = xdr_reserve_space(xdr, len + 4);
1847                 if (!p) {
1848                         spin_unlock(&dentry->d_lock);
1849                         goto out_free;
1850                 }
1851                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1852                 dprintk("/%s", dentry->d_name.name);
1853                 spin_unlock(&dentry->d_lock);
1854                 dput(dentry);
1855                 ncomponents--;
1856         }
1857
1858         err = 0;
1859 out_free:
1860         dprintk(")\n");
1861         while (ncomponents)
1862                 dput(components[--ncomponents]);
1863         kfree(components);
1864         path_put(&cur);
1865         return err;
1866 }
1867
1868 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1869                         struct svc_rqst *rqstp, const struct path *path)
1870 {
1871         struct svc_export *exp_ps;
1872         __be32 res;
1873
1874         exp_ps = rqst_find_fsidzero_export(rqstp);
1875         if (IS_ERR(exp_ps))
1876                 return nfserrno(PTR_ERR(exp_ps));
1877         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1878         exp_put(exp_ps);
1879         return res;
1880 }
1881
1882 /*
1883  *  encode a fs_locations structure
1884  */
1885 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1886                         struct svc_rqst *rqstp, struct svc_export *exp)
1887 {
1888         __be32 status;
1889         int i;
1890         __be32 *p;
1891         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1892
1893         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1894         if (status)
1895                 return status;
1896         p = xdr_reserve_space(xdr, 4);
1897         if (!p)
1898                 return nfserr_resource;
1899         *p++ = cpu_to_be32(fslocs->locations_count);
1900         for (i=0; i<fslocs->locations_count; i++) {
1901                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1902                 if (status)
1903                         return status;
1904         }
1905         return 0;
1906 }
1907
1908 static u32 nfs4_file_type(umode_t mode)
1909 {
1910         switch (mode & S_IFMT) {
1911         case S_IFIFO:   return NF4FIFO;
1912         case S_IFCHR:   return NF4CHR;
1913         case S_IFDIR:   return NF4DIR;
1914         case S_IFBLK:   return NF4BLK;
1915         case S_IFLNK:   return NF4LNK;
1916         case S_IFREG:   return NF4REG;
1917         case S_IFSOCK:  return NF4SOCK;
1918         default:        return NF4BAD;
1919         };
1920 }
1921
1922 static inline __be32
1923 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1924                      struct nfs4_ace *ace)
1925 {
1926         if (ace->whotype != NFS4_ACL_WHO_NAMED)
1927                 return nfs4_acl_write_who(xdr, ace->whotype);
1928         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1929                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1930         else
1931                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1932 }
1933
1934 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1935                               FATTR4_WORD0_RDATTR_ERROR)
1936 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1937
1938 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1939 static inline __be32
1940 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1941                             void *context, int len)
1942 {
1943         __be32 *p;
1944
1945         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1946         if (!p)
1947                 return nfserr_resource;
1948
1949         /*
1950          * For now we use a 0 here to indicate the null translation; in
1951          * the future we may place a call to translation code here.
1952          */
1953         *p++ = cpu_to_be32(0); /* lfs */
1954         *p++ = cpu_to_be32(0); /* pi */
1955         p = xdr_encode_opaque(p, context, len);
1956         return 0;
1957 }
1958 #else
1959 static inline __be32
1960 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1961                             void *context, int len)
1962 { return 0; }
1963 #endif
1964
1965 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1966 {
1967         /* As per referral draft:  */
1968         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1969             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1970                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1971                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1972                         *rdattr_err = NFSERR_MOVED;
1973                 else
1974                         return nfserr_moved;
1975         }
1976         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1977         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1978         return 0;
1979 }
1980
1981
1982 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1983 {
1984         struct path path = exp->ex_path;
1985         int err;
1986
1987         path_get(&path);
1988         while (follow_up(&path)) {
1989                 if (path.dentry != path.mnt->mnt_root)
1990                         break;
1991         }
1992         err = vfs_getattr(&path, stat);
1993         path_put(&path);
1994         return err;
1995 }
1996
1997 /*
1998  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1999  * ourselves.
2000  */
2001 static __be32
2002 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2003                 struct svc_export *exp,
2004                 struct dentry *dentry, u32 *bmval,
2005                 struct svc_rqst *rqstp, int ignore_crossmnt)
2006 {
2007         u32 bmval0 = bmval[0];
2008         u32 bmval1 = bmval[1];
2009         u32 bmval2 = bmval[2];
2010         struct kstat stat;
2011         struct svc_fh *tempfh = NULL;
2012         struct kstatfs statfs;
2013         __be32 *p;
2014         int starting_len = xdr->buf->len;
2015         int attrlen_offset;
2016         __be32 attrlen;
2017         u32 dummy;
2018         u64 dummy64;
2019         u32 rdattr_err = 0;
2020         __be32 status;
2021         int err;
2022         int aclsupport = 0;
2023         struct nfs4_acl *acl = NULL;
2024         void *context = NULL;
2025         int contextlen;
2026         bool contextsupport = false;
2027         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2028         u32 minorversion = resp->cstate.minorversion;
2029         struct path path = {
2030                 .mnt    = exp->ex_path.mnt,
2031                 .dentry = dentry,
2032         };
2033         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2034
2035         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2036         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2037         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2038         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2039
2040         if (exp->ex_fslocs.migrated) {
2041                 BUG_ON(bmval[2]);
2042                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2043                 if (status)
2044                         goto out;
2045         }
2046
2047         err = vfs_getattr(&path, &stat);
2048         if (err)
2049                 goto out_nfserr;
2050         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2051                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2052             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2053                        FATTR4_WORD1_SPACE_TOTAL))) {
2054                 err = vfs_statfs(&path, &statfs);
2055                 if (err)
2056                         goto out_nfserr;
2057         }
2058         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2059                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2060                 status = nfserr_jukebox;
2061                 if (!tempfh)
2062                         goto out;
2063                 fh_init(tempfh, NFS4_FHSIZE);
2064                 status = fh_compose(tempfh, exp, dentry, NULL);
2065                 if (status)
2066                         goto out;
2067                 fhp = tempfh;
2068         }
2069         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2070                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2071                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2072                 aclsupport = (err == 0);
2073                 if (bmval0 & FATTR4_WORD0_ACL) {
2074                         if (err == -EOPNOTSUPP)
2075                                 bmval0 &= ~FATTR4_WORD0_ACL;
2076                         else if (err == -EINVAL) {
2077                                 status = nfserr_attrnotsupp;
2078                                 goto out;
2079                         } else if (err != 0)
2080                                 goto out_nfserr;
2081                 }
2082         }
2083
2084 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2085         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2086                         bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2087                 err = security_inode_getsecctx(dentry->d_inode,
2088                                                 &context, &contextlen);
2089                 contextsupport = (err == 0);
2090                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2091                         if (err == -EOPNOTSUPP)
2092                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2093                         else if (err)
2094                                 goto out_nfserr;
2095                 }
2096         }
2097 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2098
2099         if (bmval2) {
2100                 p = xdr_reserve_space(xdr, 16);
2101                 if (!p)
2102                         goto out_resource;
2103                 *p++ = cpu_to_be32(3);
2104                 *p++ = cpu_to_be32(bmval0);
2105                 *p++ = cpu_to_be32(bmval1);
2106                 *p++ = cpu_to_be32(bmval2);
2107         } else if (bmval1) {
2108                 p = xdr_reserve_space(xdr, 12);
2109                 if (!p)
2110                         goto out_resource;
2111                 *p++ = cpu_to_be32(2);
2112                 *p++ = cpu_to_be32(bmval0);
2113                 *p++ = cpu_to_be32(bmval1);
2114         } else {
2115                 p = xdr_reserve_space(xdr, 8);
2116                 if (!p)
2117                         goto out_resource;
2118                 *p++ = cpu_to_be32(1);
2119                 *p++ = cpu_to_be32(bmval0);
2120         }
2121
2122         attrlen_offset = xdr->buf->len;
2123         p = xdr_reserve_space(xdr, 4);
2124         if (!p)
2125                 goto out_resource;
2126         p++;                /* to be backfilled later */
2127
2128         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2129                 u32 word0 = nfsd_suppattrs0(minorversion);
2130                 u32 word1 = nfsd_suppattrs1(minorversion);
2131                 u32 word2 = nfsd_suppattrs2(minorversion);
2132
2133                 if (!aclsupport)
2134                         word0 &= ~FATTR4_WORD0_ACL;
2135                 if (!contextsupport)
2136                         word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2137                 if (!word2) {
2138                         p = xdr_reserve_space(xdr, 12);
2139                         if (!p)
2140                                 goto out_resource;
2141                         *p++ = cpu_to_be32(2);
2142                         *p++ = cpu_to_be32(word0);
2143                         *p++ = cpu_to_be32(word1);
2144                 } else {
2145                         p = xdr_reserve_space(xdr, 16);
2146                         if (!p)
2147                                 goto out_resource;
2148                         *p++ = cpu_to_be32(3);
2149                         *p++ = cpu_to_be32(word0);
2150                         *p++ = cpu_to_be32(word1);
2151                         *p++ = cpu_to_be32(word2);
2152                 }
2153         }
2154         if (bmval0 & FATTR4_WORD0_TYPE) {
2155                 p = xdr_reserve_space(xdr, 4);
2156                 if (!p)
2157                         goto out_resource;
2158                 dummy = nfs4_file_type(stat.mode);
2159                 if (dummy == NF4BAD) {
2160                         status = nfserr_serverfault;
2161                         goto out;
2162                 }
2163                 *p++ = cpu_to_be32(dummy);
2164         }
2165         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2166                 p = xdr_reserve_space(xdr, 4);
2167                 if (!p)
2168                         goto out_resource;
2169                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2170                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2171                 else
2172                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2173                                                 NFS4_FH_VOL_RENAME);
2174         }
2175         if (bmval0 & FATTR4_WORD0_CHANGE) {
2176                 p = xdr_reserve_space(xdr, 8);
2177                 if (!p)
2178                         goto out_resource;
2179                 p = encode_change(p, &stat, dentry->d_inode);
2180         }
2181         if (bmval0 & FATTR4_WORD0_SIZE) {
2182                 p = xdr_reserve_space(xdr, 8);
2183                 if (!p)
2184                         goto out_resource;
2185                 p = xdr_encode_hyper(p, stat.size);
2186         }
2187         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2188                 p = xdr_reserve_space(xdr, 4);
2189                 if (!p)
2190                         goto out_resource;
2191                 *p++ = cpu_to_be32(1);
2192         }
2193         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2194                 p = xdr_reserve_space(xdr, 4);
2195                 if (!p)
2196                         goto out_resource;
2197                 *p++ = cpu_to_be32(1);
2198         }
2199         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2200                 p = xdr_reserve_space(xdr, 4);
2201                 if (!p)
2202                         goto out_resource;
2203                 *p++ = cpu_to_be32(0);
2204         }
2205         if (bmval0 & FATTR4_WORD0_FSID) {
2206                 p = xdr_reserve_space(xdr, 16);
2207                 if (!p)
2208                         goto out_resource;
2209                 if (exp->ex_fslocs.migrated) {
2210                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2211                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2212                 } else switch(fsid_source(fhp)) {
2213                 case FSIDSOURCE_FSID:
2214                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2215                         p = xdr_encode_hyper(p, (u64)0);
2216                         break;
2217                 case FSIDSOURCE_DEV:
2218                         *p++ = cpu_to_be32(0);
2219                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2220                         *p++ = cpu_to_be32(0);
2221                         *p++ = cpu_to_be32(MINOR(stat.dev));
2222                         break;
2223                 case FSIDSOURCE_UUID:
2224                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2225                                                                 EX_UUID_LEN);
2226                         break;
2227                 }
2228         }
2229         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2230                 p = xdr_reserve_space(xdr, 4);
2231                 if (!p)
2232                         goto out_resource;
2233                 *p++ = cpu_to_be32(0);
2234         }
2235         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2236                 p = xdr_reserve_space(xdr, 4);
2237                 if (!p)
2238                         goto out_resource;
2239                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2240         }
2241         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2242                 p = xdr_reserve_space(xdr, 4);
2243                 if (!p)
2244                         goto out_resource;
2245                 *p++ = cpu_to_be32(rdattr_err);
2246         }
2247         if (bmval0 & FATTR4_WORD0_ACL) {
2248                 struct nfs4_ace *ace;
2249
2250                 if (acl == NULL) {
2251                         p = xdr_reserve_space(xdr, 4);
2252                         if (!p)
2253                                 goto out_resource;
2254
2255                         *p++ = cpu_to_be32(0);
2256                         goto out_acl;
2257                 }
2258                 p = xdr_reserve_space(xdr, 4);
2259                 if (!p)
2260                         goto out_resource;
2261                 *p++ = cpu_to_be32(acl->naces);
2262
2263                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2264                         p = xdr_reserve_space(xdr, 4*3);
2265                         if (!p)
2266                                 goto out_resource;
2267                         *p++ = cpu_to_be32(ace->type);
2268                         *p++ = cpu_to_be32(ace->flag);
2269                         *p++ = cpu_to_be32(ace->access_mask &
2270                                                         NFS4_ACE_MASK_ALL);
2271                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2272                         if (status)
2273                                 goto out;
2274                 }
2275         }
2276 out_acl:
2277         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2278                 p = xdr_reserve_space(xdr, 4);
2279                 if (!p)
2280                         goto out_resource;
2281                 *p++ = cpu_to_be32(aclsupport ?
2282                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2283         }
2284         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2285                 p = xdr_reserve_space(xdr, 4);
2286                 if (!p)
2287                         goto out_resource;
2288                 *p++ = cpu_to_be32(1);
2289         }
2290         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2291                 p = xdr_reserve_space(xdr, 4);
2292                 if (!p)
2293                         goto out_resource;
2294                 *p++ = cpu_to_be32(0);
2295         }
2296         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2297                 p = xdr_reserve_space(xdr, 4);
2298                 if (!p)
2299                         goto out_resource;
2300                 *p++ = cpu_to_be32(1);
2301         }
2302         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2303                 p = xdr_reserve_space(xdr, 4);
2304                 if (!p)
2305                         goto out_resource;
2306                 *p++ = cpu_to_be32(1);
2307         }
2308         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2309                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2310                 if (!p)
2311                         goto out_resource;
2312                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2313                                         fhp->fh_handle.fh_size);
2314         }
2315         if (bmval0 & FATTR4_WORD0_FILEID) {
2316                 p = xdr_reserve_space(xdr, 8);
2317                 if (!p)
2318                         goto out_resource;
2319                 p = xdr_encode_hyper(p, stat.ino);
2320         }
2321         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2322                 p = xdr_reserve_space(xdr, 8);
2323                 if (!p)
2324                         goto out_resource;
2325                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2326         }
2327         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2328                 p = xdr_reserve_space(xdr, 8);
2329                 if (!p)
2330                         goto out_resource;
2331                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2332         }
2333         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2334                 p = xdr_reserve_space(xdr, 8);
2335                 if (!p)
2336                         goto out_resource;
2337                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2338         }
2339         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2340                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2341                 if (status)
2342                         goto out;
2343         }
2344         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2345                 p = xdr_reserve_space(xdr, 4);
2346                 if (!p)
2347                         goto out_resource;
2348                 *p++ = cpu_to_be32(1);
2349         }
2350         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2351                 p = xdr_reserve_space(xdr, 8);
2352                 if (!p)
2353                         goto out_resource;
2354                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2355         }
2356         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2357                 p = xdr_reserve_space(xdr, 4);
2358                 if (!p)
2359                         goto out_resource;
2360                 *p++ = cpu_to_be32(255);
2361         }
2362         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2363                 p = xdr_reserve_space(xdr, 4);
2364                 if (!p)
2365                         goto out_resource;
2366                 *p++ = cpu_to_be32(statfs.f_namelen);
2367         }
2368         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2369                 p = xdr_reserve_space(xdr, 8);
2370                 if (!p)
2371                         goto out_resource;
2372                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2373         }
2374         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2375                 p = xdr_reserve_space(xdr, 8);
2376                 if (!p)
2377                         goto out_resource;
2378                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2379         }
2380         if (bmval1 & FATTR4_WORD1_MODE) {
2381                 p = xdr_reserve_space(xdr, 4);
2382                 if (!p)
2383                         goto out_resource;
2384                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2385         }
2386         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2387                 p = xdr_reserve_space(xdr, 4);
2388                 if (!p)
2389                         goto out_resource;
2390                 *p++ = cpu_to_be32(1);
2391         }
2392         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2393                 p = xdr_reserve_space(xdr, 4);
2394                 if (!p)
2395                         goto out_resource;
2396                 *p++ = cpu_to_be32(stat.nlink);
2397         }
2398         if (bmval1 & FATTR4_WORD1_OWNER) {
2399                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2400                 if (status)
2401                         goto out;
2402         }
2403         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2404                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2405                 if (status)
2406                         goto out;
2407         }
2408         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2409                 p = xdr_reserve_space(xdr, 8);
2410                 if (!p)
2411                         goto out_resource;
2412                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2413                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2414         }
2415         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2416                 p = xdr_reserve_space(xdr, 8);
2417                 if (!p)
2418                         goto out_resource;
2419                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2420                 p = xdr_encode_hyper(p, dummy64);
2421         }
2422         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2423                 p = xdr_reserve_space(xdr, 8);
2424                 if (!p)
2425                         goto out_resource;
2426                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2427                 p = xdr_encode_hyper(p, dummy64);
2428         }
2429         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2430                 p = xdr_reserve_space(xdr, 8);
2431                 if (!p)
2432                         goto out_resource;
2433                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2434                 p = xdr_encode_hyper(p, dummy64);
2435         }
2436         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2437                 p = xdr_reserve_space(xdr, 8);
2438                 if (!p)
2439                         goto out_resource;
2440                 dummy64 = (u64)stat.blocks << 9;
2441                 p = xdr_encode_hyper(p, dummy64);
2442         }
2443         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2444                 p = xdr_reserve_space(xdr, 12);
2445                 if (!p)
2446                         goto out_resource;
2447                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2448                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2449         }
2450         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2451                 p = xdr_reserve_space(xdr, 12);
2452                 if (!p)
2453                         goto out_resource;
2454                 *p++ = cpu_to_be32(0);
2455                 *p++ = cpu_to_be32(1);
2456                 *p++ = cpu_to_be32(0);
2457         }
2458         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2459                 p = xdr_reserve_space(xdr, 12);
2460                 if (!p)
2461                         goto out_resource;
2462                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2463                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2464         }
2465         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2466                 p = xdr_reserve_space(xdr, 12);
2467                 if (!p)
2468                         goto out_resource;
2469                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2470                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2471         }
2472         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2473                 p = xdr_reserve_space(xdr, 8);
2474                 if (!p)
2475                         goto out_resource;
2476                 /*
2477                  * Get parent's attributes if not ignoring crossmount
2478                  * and this is the root of a cross-mounted filesystem.
2479                  */
2480                 if (ignore_crossmnt == 0 &&
2481                     dentry == exp->ex_path.mnt->mnt_root)
2482                         get_parent_attributes(exp, &stat);
2483                 p = xdr_encode_hyper(p, stat.ino);
2484         }
2485         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2486                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2487                                                                 contextlen);
2488                 if (status)
2489                         goto out;
2490         }
2491         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2492                 p = xdr_reserve_space(xdr, 16);
2493                 if (!p)
2494                         goto out_resource;
2495                 *p++ = cpu_to_be32(3);
2496                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2497                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2498                 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2499         }
2500
2501         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2502         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2503         status = nfs_ok;
2504
2505 out:
2506 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2507         if (context)
2508                 security_release_secctx(context, contextlen);
2509 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2510         kfree(acl);
2511         if (tempfh) {
2512                 fh_put(tempfh);
2513                 kfree(tempfh);
2514         }
2515         if (status)
2516                 xdr_truncate_encode(xdr, starting_len);
2517         return status;
2518 out_nfserr:
2519         status = nfserrno(err);
2520         goto out;
2521 out_resource:
2522         status = nfserr_resource;
2523         goto out;
2524 }
2525
2526 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2527                                 struct xdr_buf *buf, __be32 *p, int bytes)
2528 {
2529         xdr->scratch.iov_len = 0;
2530         memset(buf, 0, sizeof(struct xdr_buf));
2531         buf->head[0].iov_base = p;
2532         buf->head[0].iov_len = 0;
2533         buf->len = 0;
2534         xdr->buf = buf;
2535         xdr->iov = buf->head;
2536         xdr->p = p;
2537         xdr->end = (void *)p + bytes;
2538         buf->buflen = bytes;
2539 }
2540
2541 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2542                         struct svc_fh *fhp, struct svc_export *exp,
2543                         struct dentry *dentry, u32 *bmval,
2544                         struct svc_rqst *rqstp, int ignore_crossmnt)
2545 {
2546         struct xdr_buf dummy;
2547         struct xdr_stream xdr;
2548         __be32 ret;
2549
2550         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2551         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2552                                                         ignore_crossmnt);
2553         *p = xdr.p;
2554         return ret;
2555 }
2556
2557 static inline int attributes_need_mount(u32 *bmval)
2558 {
2559         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2560                 return 1;
2561         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2562                 return 1;
2563         return 0;
2564 }
2565
2566 static __be32
2567 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2568                         const char *name, int namlen)
2569 {
2570         struct svc_export *exp = cd->rd_fhp->fh_export;
2571         struct dentry *dentry;
2572         __be32 nfserr;
2573         int ignore_crossmnt = 0;
2574
2575         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2576         if (IS_ERR(dentry))
2577                 return nfserrno(PTR_ERR(dentry));
2578         if (!dentry->d_inode) {
2579                 /*
2580                  * nfsd_buffered_readdir drops the i_mutex between
2581                  * readdir and calling this callback, leaving a window
2582                  * where this directory entry could have gone away.
2583                  */
2584                 dput(dentry);
2585                 return nfserr_noent;
2586         }
2587
2588         exp_get(exp);
2589         /*
2590          * In the case of a mountpoint, the client may be asking for
2591          * attributes that are only properties of the underlying filesystem
2592          * as opposed to the cross-mounted file system. In such a case,
2593          * we will not follow the cross mount and will fill the attribtutes
2594          * directly from the mountpoint dentry.
2595          */
2596         if (nfsd_mountpoint(dentry, exp)) {
2597                 int err;
2598
2599                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2600                                 && !attributes_need_mount(cd->rd_bmval)) {
2601                         ignore_crossmnt = 1;
2602                         goto out_encode;
2603                 }
2604                 /*
2605                  * Why the heck aren't we just using nfsd_lookup??
2606                  * Different "."/".." handling?  Something else?
2607                  * At least, add a comment here to explain....
2608                  */
2609                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2610                 if (err) {
2611                         nfserr = nfserrno(err);
2612                         goto out_put;
2613                 }
2614                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2615                 if (nfserr)
2616                         goto out_put;
2617
2618         }
2619 out_encode:
2620         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2621                                         cd->rd_rqstp, ignore_crossmnt);
2622 out_put:
2623         dput(dentry);
2624         exp_put(exp);
2625         return nfserr;
2626 }
2627
2628 static __be32 *
2629 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2630 {
2631         __be32 *p;
2632
2633         p = xdr_reserve_space(xdr, 6);
2634         if (!p)
2635                 return NULL;
2636         *p++ = htonl(2);
2637         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2638         *p++ = htonl(0);                         /* bmval1 */
2639
2640         *p++ = htonl(4);     /* attribute length */
2641         *p++ = nfserr;       /* no htonl */
2642         return p;
2643 }
2644
2645 static int
2646 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2647                     loff_t offset, u64 ino, unsigned int d_type)
2648 {
2649         struct readdir_cd *ccd = ccdv;
2650         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2651         struct xdr_stream *xdr = cd->xdr;
2652         int start_offset = xdr->buf->len;
2653         int cookie_offset;
2654         int entry_bytes;
2655         __be32 nfserr = nfserr_toosmall;
2656         __be64 wire_offset;
2657         __be32 *p;
2658
2659         /* In nfsv4, "." and ".." never make it onto the wire.. */
2660         if (name && isdotent(name, namlen)) {
2661                 cd->common.err = nfs_ok;
2662                 return 0;
2663         }
2664
2665         if (cd->cookie_offset) {
2666                 wire_offset = cpu_to_be64(offset);
2667                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2668                                                         &wire_offset, 8);
2669         }
2670
2671         p = xdr_reserve_space(xdr, 4);
2672         if (!p)
2673                 goto fail;
2674         *p++ = xdr_one;                             /* mark entry present */
2675         cookie_offset = xdr->buf->len;
2676         p = xdr_reserve_space(xdr, 3*4 + namlen);
2677         if (!p)
2678                 goto fail;
2679         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2680         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2681
2682         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2683         switch (nfserr) {
2684         case nfs_ok:
2685                 break;
2686         case nfserr_resource:
2687                 nfserr = nfserr_toosmall;
2688                 goto fail;
2689         case nfserr_noent:
2690                 xdr_truncate_encode(xdr, start_offset);
2691                 goto skip_entry;
2692         default:
2693                 /*
2694                  * If the client requested the RDATTR_ERROR attribute,
2695                  * we stuff the error code into this attribute
2696                  * and continue.  If this attribute was not requested,
2697                  * then in accordance with the spec, we fail the
2698                  * entire READDIR operation(!)
2699                  */
2700                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2701                         goto fail;
2702                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2703                 if (p == NULL) {
2704                         nfserr = nfserr_toosmall;
2705                         goto fail;
2706                 }
2707         }
2708         nfserr = nfserr_toosmall;
2709         entry_bytes = xdr->buf->len - start_offset;
2710         if (entry_bytes > cd->rd_maxcount)
2711                 goto fail;
2712         cd->rd_maxcount -= entry_bytes;
2713         if (!cd->rd_dircount)
2714                 goto fail;
2715         cd->rd_dircount--;
2716         cd->cookie_offset = cookie_offset;
2717 skip_entry:
2718         cd->common.err = nfs_ok;
2719         return 0;
2720 fail:
2721         xdr_truncate_encode(xdr, start_offset);
2722         cd->common.err = nfserr;
2723         return -EINVAL;
2724 }
2725
2726 static __be32
2727 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2728 {
2729         __be32 *p;
2730
2731         p = xdr_reserve_space(xdr, sizeof(stateid_t));
2732         if (!p)
2733                 return nfserr_resource;
2734         *p++ = cpu_to_be32(sid->si_generation);
2735         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2736                                         sizeof(stateid_opaque_t));
2737         return 0;
2738 }
2739
2740 static __be32
2741 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2742 {
2743         struct xdr_stream *xdr = &resp->xdr;
2744         __be32 *p;
2745
2746         if (!nfserr) {
2747                 p = xdr_reserve_space(xdr, 8);
2748                 if (!p)
2749                         return nfserr_resource;
2750                 *p++ = cpu_to_be32(access->ac_supported);
2751                 *p++ = cpu_to_be32(access->ac_resp_access);
2752         }
2753         return nfserr;
2754 }
2755
2756 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2757 {
2758         struct xdr_stream *xdr = &resp->xdr;
2759         __be32 *p;
2760
2761         if (!nfserr) {
2762                 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2763                 if (!p)
2764                         return nfserr_resource;
2765                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2766                                                 NFS4_MAX_SESSIONID_LEN);
2767                 *p++ = cpu_to_be32(bcts->dir);
2768                 /* Sorry, we do not yet support RDMA over 4.1: */
2769                 *p++ = cpu_to_be32(0);
2770         }
2771         return nfserr;
2772 }
2773
2774 static __be32
2775 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2776 {
2777         struct xdr_stream *xdr = &resp->xdr;
2778
2779         if (!nfserr)
2780                 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2781
2782         return nfserr;
2783 }
2784
2785
2786 static __be32
2787 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2788 {
2789         struct xdr_stream *xdr = &resp->xdr;
2790         __be32 *p;
2791
2792         if (!nfserr) {
2793                 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2794                 if (!p)
2795                         return nfserr_resource;
2796                 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2797                                                 NFS4_VERIFIER_SIZE);
2798         }
2799         return nfserr;
2800 }
2801
2802 static __be32
2803 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2804 {
2805         struct xdr_stream *xdr = &resp->xdr;
2806         __be32 *p;
2807
2808         if (!nfserr) {
2809                 p = xdr_reserve_space(xdr, 32);
2810                 if (!p)
2811                         return nfserr_resource;
2812                 p = encode_cinfo(p, &create->cr_cinfo);
2813                 *p++ = cpu_to_be32(2);
2814                 *p++ = cpu_to_be32(create->cr_bmval[0]);
2815                 *p++ = cpu_to_be32(create->cr_bmval[1]);
2816         }
2817         return nfserr;
2818 }
2819
2820 static __be32
2821 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2822 {
2823         struct svc_fh *fhp = getattr->ga_fhp;
2824         struct xdr_stream *xdr = &resp->xdr;
2825
2826         if (nfserr)
2827                 return nfserr;
2828
2829         nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2830                                     getattr->ga_bmval,
2831                                     resp->rqstp, 0);
2832         return nfserr;
2833 }
2834
2835 static __be32
2836 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2837 {
2838         struct xdr_stream *xdr = &resp->xdr;
2839         struct svc_fh *fhp = *fhpp;
2840         unsigned int len;
2841         __be32 *p;
2842
2843         if (!nfserr) {
2844                 len = fhp->fh_handle.fh_size;
2845                 p = xdr_reserve_space(xdr, len + 4);
2846                 if (!p)
2847                         return nfserr_resource;
2848                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2849         }
2850         return nfserr;
2851 }
2852
2853 /*
2854 * Including all fields other than the name, a LOCK4denied structure requires
2855 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2856 */
2857 static __be32
2858 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2859 {
2860         struct xdr_netobj *conf = &ld->ld_owner;
2861         __be32 *p;
2862
2863 again:
2864         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2865         if (!p) {
2866                 /*
2867                  * Don't fail to return the result just because we can't
2868                  * return the conflicting open:
2869                  */
2870                 if (conf->len) {
2871                         conf->len = 0;
2872                         conf->data = NULL;
2873                         goto again;
2874                 }
2875                 return nfserr_resource;
2876         }
2877         p = xdr_encode_hyper(p, ld->ld_start);
2878         p = xdr_encode_hyper(p, ld->ld_length);
2879         *p++ = cpu_to_be32(ld->ld_type);
2880         if (conf->len) {
2881                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2882                 p = xdr_encode_opaque(p, conf->data, conf->len);
2883         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2884                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2885                 *p++ = cpu_to_be32(0); /* length of owner name */
2886         }
2887         return nfserr_denied;
2888 }
2889
2890 static __be32
2891 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2892 {
2893         struct xdr_stream *xdr = &resp->xdr;
2894
2895         if (!nfserr)
2896                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2897         else if (nfserr == nfserr_denied)
2898                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2899         kfree(lock->lk_denied.ld_owner.data);
2900         return nfserr;
2901 }
2902
2903 static __be32
2904 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2905 {
2906         struct xdr_stream *xdr = &resp->xdr;
2907
2908         if (nfserr == nfserr_denied)
2909                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2910         return nfserr;
2911 }
2912
2913 static __be32
2914 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2915 {
2916         struct xdr_stream *xdr = &resp->xdr;
2917
2918         if (!nfserr)
2919                 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2920
2921         return nfserr;
2922 }
2923
2924
2925 static __be32
2926 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2927 {
2928         struct xdr_stream *xdr = &resp->xdr;
2929         __be32 *p;
2930
2931         if (!nfserr) {
2932                 p = xdr_reserve_space(xdr, 20);
2933                 if (!p)
2934                         return nfserr_resource;
2935                 p = encode_cinfo(p, &link->li_cinfo);
2936         }
2937         return nfserr;
2938 }
2939
2940
2941 static __be32
2942 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2943 {
2944         struct xdr_stream *xdr = &resp->xdr;
2945         __be32 *p;
2946
2947         if (nfserr)
2948                 goto out;
2949
2950         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2951         if (nfserr)
2952                 goto out;
2953         p = xdr_reserve_space(xdr, 40);
2954         if (!p)
2955                 return nfserr_resource;
2956         p = encode_cinfo(p, &open->op_cinfo);
2957         *p++ = cpu_to_be32(open->op_rflags);
2958         *p++ = cpu_to_be32(2);
2959         *p++ = cpu_to_be32(open->op_bmval[0]);
2960         *p++ = cpu_to_be32(open->op_bmval[1]);
2961         *p++ = cpu_to_be32(open->op_delegate_type);
2962
2963         switch (open->op_delegate_type) {
2964         case NFS4_OPEN_DELEGATE_NONE:
2965                 break;
2966         case NFS4_OPEN_DELEGATE_READ:
2967                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2968                 if (nfserr)
2969                         return nfserr;
2970                 p = xdr_reserve_space(xdr, 20);
2971                 if (!p)
2972                         return nfserr_resource;
2973                 *p++ = cpu_to_be32(open->op_recall);
2974
2975                 /*
2976                  * TODO: ACE's in delegations
2977                  */
2978                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2979                 *p++ = cpu_to_be32(0);
2980                 *p++ = cpu_to_be32(0);
2981                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
2982                 break;
2983         case NFS4_OPEN_DELEGATE_WRITE:
2984                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2985                 if (nfserr)
2986                         return nfserr;
2987                 p = xdr_reserve_space(xdr, 32);
2988                 if (!p)
2989                         return nfserr_resource;
2990                 *p++ = cpu_to_be32(0);
2991
2992                 /*
2993                  * TODO: space_limit's in delegations
2994                  */
2995                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
2996                 *p++ = cpu_to_be32(~(u32)0);
2997                 *p++ = cpu_to_be32(~(u32)0);
2998
2999                 /*
3000                  * TODO: ACE's in delegations
3001                  */
3002                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3003                 *p++ = cpu_to_be32(0);
3004                 *p++ = cpu_to_be32(0);
3005                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3006                 break;
3007         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3008                 switch (open->op_why_no_deleg) {
3009                 case WND4_CONTENTION:
3010                 case WND4_RESOURCE:
3011                         p = xdr_reserve_space(xdr, 8);
3012                         if (!p)
3013                                 return nfserr_resource;
3014                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3015                         /* deleg signaling not supported yet: */
3016                         *p++ = cpu_to_be32(0);
3017                         break;
3018                 default:
3019                         p = xdr_reserve_space(xdr, 4);
3020                         if (!p)
3021                                 return nfserr_resource;
3022                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3023                 }
3024                 break;
3025         default:
3026                 BUG();
3027         }
3028         /* XXX save filehandle here */
3029 out:
3030         return nfserr;
3031 }
3032
3033 static __be32
3034 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3035 {
3036         struct xdr_stream *xdr = &resp->xdr;
3037
3038         if (!nfserr)
3039                 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3040
3041         return nfserr;
3042 }
3043
3044 static __be32
3045 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3046 {
3047         struct xdr_stream *xdr = &resp->xdr;
3048
3049         if (!nfserr)
3050                 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3051
3052         return nfserr;
3053 }
3054
3055 static __be32 nfsd4_encode_splice_read(
3056                                 struct nfsd4_compoundres *resp,
3057                                 struct nfsd4_read *read,
3058                                 struct file *file, unsigned long maxcount)
3059 {
3060         struct xdr_stream *xdr = &resp->xdr;
3061         struct xdr_buf *buf = xdr->buf;
3062         u32 eof;
3063         int space_left;
3064         __be32 nfserr;
3065         __be32 *p = xdr->p - 2;
3066
3067         /*
3068          * Don't inline pages unless we know there's room for eof,
3069          * count, and possible padding:
3070          */
3071         if (xdr->end - xdr->p < 3)
3072                 return nfserr_resource;
3073
3074         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3075                                   read->rd_offset, &maxcount);
3076         if (nfserr) {
3077                 /*
3078                  * nfsd_splice_actor may have already messed with the
3079                  * page length; reset it so as not to confuse
3080                  * xdr_truncate_encode:
3081                  */
3082                 buf->page_len = 0;
3083                 return nfserr;
3084         }
3085
3086         eof = (read->rd_offset + maxcount >=
3087                read->rd_fhp->fh_dentry->d_inode->i_size);
3088
3089         *(p++) = htonl(eof);
3090         *(p++) = htonl(maxcount);
3091
3092         buf->page_len = maxcount;
3093         buf->len += maxcount;
3094         xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE;
3095
3096         /* Use rest of head for padding and remaining ops: */
3097         buf->tail[0].iov_base = xdr->p;
3098         buf->tail[0].iov_len = 0;
3099         xdr->iov = buf->tail;
3100         if (maxcount&3) {
3101                 int pad = 4 - (maxcount&3);
3102
3103                 *(xdr->p++) = 0;
3104
3105                 buf->tail[0].iov_base += maxcount&3;
3106                 buf->tail[0].iov_len = pad;
3107                 buf->len += pad;
3108         }
3109
3110         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3111                                 buf->buflen - buf->len);
3112         buf->buflen = buf->len + space_left;
3113         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3114
3115         return 0;
3116 }
3117
3118 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3119                                  struct nfsd4_read *read,
3120                                  struct file *file, unsigned long maxcount)
3121 {
3122         struct xdr_stream *xdr = &resp->xdr;
3123         u32 eof;
3124         int v;
3125         int starting_len = xdr->buf->len - 8;
3126         long len;
3127         int thislen;
3128         __be32 nfserr;
3129         __be32 tmp;
3130         __be32 *p;
3131         u32 zzz = 0;
3132         int pad;
3133
3134         len = maxcount;
3135         v = 0;
3136
3137         thislen = (void *)xdr->end - (void *)xdr->p;
3138         if (len < thislen)
3139                 thislen = len;
3140         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3141         WARN_ON_ONCE(!p);
3142         resp->rqstp->rq_vec[v].iov_base = p;
3143         resp->rqstp->rq_vec[v].iov_len = thislen;
3144         v++;
3145         len -= thislen;
3146
3147         while (len) {
3148                 thislen = min_t(long, len, PAGE_SIZE);
3149                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3150                 WARN_ON_ONCE(!p);
3151                 resp->rqstp->rq_vec[v].iov_base = p;
3152                 resp->rqstp->rq_vec[v].iov_len = thislen;
3153                 v++;
3154                 len -= thislen;
3155         }
3156         read->rd_vlen = v;
3157
3158         nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3159                         read->rd_vlen, &maxcount);
3160         if (nfserr)
3161                 return nfserr;
3162         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3163
3164         eof = (read->rd_offset + maxcount >=
3165                read->rd_fhp->fh_dentry->d_inode->i_size);
3166
3167         tmp = htonl(eof);
3168         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3169         tmp = htonl(maxcount);
3170         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3171
3172         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3173         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3174                                                                 &zzz, pad);
3175         return 0;
3176
3177 }
3178
3179 static __be32
3180 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3181                   struct nfsd4_read *read)
3182 {
3183         unsigned long maxcount;
3184         struct xdr_stream *xdr = &resp->xdr;
3185         struct file *file = read->rd_filp;
3186         int starting_len = xdr->buf->len;
3187         struct raparms *ra;
3188         __be32 *p;
3189         __be32 err;
3190
3191         if (nfserr)
3192                 return nfserr;
3193
3194         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3195         if (!p) {
3196                 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3197                 return nfserr_resource;
3198         }
3199         if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3200                 WARN_ON_ONCE(1);
3201                 return nfserr_resource;
3202         }
3203         xdr_commit_encode(xdr);
3204
3205         maxcount = svc_max_payload(resp->rqstp);
3206         if (maxcount > xdr->buf->buflen - xdr->buf->len)
3207                 maxcount = xdr->buf->buflen - xdr->buf->len;
3208         if (maxcount > read->rd_length)
3209                 maxcount = read->rd_length;
3210
3211         if (!read->rd_filp) {
3212                 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3213                                                 &file, &ra);
3214                 if (err)
3215                         goto err_truncate;
3216         }
3217
3218         if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3219                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3220         else
3221                 err = nfsd4_encode_readv(resp, read, file, maxcount);
3222
3223         if (!read->rd_filp)
3224                 nfsd_put_tmp_read_open(file, ra);
3225
3226 err_truncate:
3227         if (err)
3228                 xdr_truncate_encode(xdr, starting_len);
3229         return err;
3230 }
3231
3232 static __be32
3233 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3234 {
3235         int maxcount;
3236         __be32 wire_count;
3237         int zero = 0;
3238         struct xdr_stream *xdr = &resp->xdr;
3239         int length_offset = xdr->buf->len;
3240         __be32 *p;
3241
3242         if (nfserr)
3243                 return nfserr;
3244
3245         p = xdr_reserve_space(xdr, 4);
3246         if (!p)
3247                 return nfserr_resource;
3248         maxcount = PAGE_SIZE;
3249
3250         p = xdr_reserve_space(xdr, maxcount);
3251         if (!p)
3252                 return nfserr_resource;
3253         /*
3254          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3255          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3256          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3257          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3258          */
3259         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3260                                                 (char *)p, &maxcount);
3261         if (nfserr == nfserr_isdir)
3262                 nfserr = nfserr_inval;
3263         if (nfserr) {
3264                 xdr_truncate_encode(xdr, length_offset);
3265                 return nfserr;
3266         }
3267
3268         wire_count = htonl(maxcount);
3269         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3270         xdr_truncate_encode(xdr, length_offset + 4 + maxcount);
3271         if (maxcount & 3)
3272                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3273                                                 &zero, 4 - (maxcount&3));
3274         return 0;
3275 }
3276
3277 static __be32
3278 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3279 {
3280         int maxcount;
3281         int bytes_left;
3282         loff_t offset;
3283         __be64 wire_offset;
3284         struct xdr_stream *xdr = &resp->xdr;
3285         int starting_len = xdr->buf->len;
3286         __be32 *p;
3287
3288         if (nfserr)
3289                 return nfserr;
3290
3291         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3292         if (!p)
3293                 return nfserr_resource;
3294
3295         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3296         *p++ = cpu_to_be32(0);
3297         *p++ = cpu_to_be32(0);
3298         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3299                                 - (char *)resp->xdr.buf->head[0].iov_base;
3300
3301         /*
3302          * Number of bytes left for directory entries allowing for the
3303          * final 8 bytes of the readdir and a following failed op:
3304          */
3305         bytes_left = xdr->buf->buflen - xdr->buf->len
3306                         - COMPOUND_ERR_SLACK_SPACE - 8;
3307         if (bytes_left < 0) {
3308                 nfserr = nfserr_resource;
3309                 goto err_no_verf;
3310         }
3311         maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3312         /*
3313          * Note the rfc defines rd_maxcount as the size of the
3314          * READDIR4resok structure, which includes the verifier above
3315          * and the 8 bytes encoded at the end of this function:
3316          */
3317         if (maxcount < 16) {
3318                 nfserr = nfserr_toosmall;
3319                 goto err_no_verf;
3320         }
3321         maxcount = min_t(int, maxcount-16, bytes_left);
3322
3323         readdir->xdr = xdr;
3324         readdir->rd_maxcount = maxcount;
3325         readdir->common.err = 0;
3326         readdir->cookie_offset = 0;
3327
3328         offset = readdir->rd_cookie;
3329         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3330                               &offset,
3331                               &readdir->common, nfsd4_encode_dirent);
3332         if (nfserr == nfs_ok &&
3333             readdir->common.err == nfserr_toosmall &&
3334             xdr->buf->len == starting_len + 8) {
3335                 /* nothing encoded; which limit did we hit?: */
3336                 if (maxcount - 16 < bytes_left)
3337                         /* It was the fault of rd_maxcount: */
3338                         nfserr = nfserr_toosmall;
3339                 else
3340                         /* We ran out of buffer space: */
3341                         nfserr = nfserr_resource;
3342         }
3343         if (nfserr)
3344                 goto err_no_verf;
3345
3346         if (readdir->cookie_offset) {
3347                 wire_offset = cpu_to_be64(offset);
3348                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3349                                                         &wire_offset, 8);
3350         }
3351
3352         p = xdr_reserve_space(xdr, 8);
3353         if (!p) {
3354                 WARN_ON_ONCE(1);
3355                 goto err_no_verf;
3356         }
3357         *p++ = 0;       /* no more entries */
3358         *p++ = htonl(readdir->common.err == nfserr_eof);
3359
3360         return 0;
3361 err_no_verf:
3362         xdr_truncate_encode(xdr, starting_len);
3363         return nfserr;
3364 }
3365
3366 static __be32
3367 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3368 {
3369         struct xdr_stream *xdr = &resp->xdr;
3370         __be32 *p;
3371
3372         if (!nfserr) {
3373                 p = xdr_reserve_space(xdr, 20);
3374                 if (!p)
3375                         return nfserr_resource;
3376                 p = encode_cinfo(p, &remove->rm_cinfo);
3377         }
3378         return nfserr;
3379 }
3380
3381 static __be32
3382 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3383 {
3384         struct xdr_stream *xdr = &resp->xdr;
3385         __be32 *p;
3386
3387         if (!nfserr) {
3388                 p = xdr_reserve_space(xdr, 40);
3389                 if (!p)
3390                         return nfserr_resource;
3391                 p = encode_cinfo(p, &rename->rn_sinfo);
3392                 p = encode_cinfo(p, &rename->rn_tinfo);
3393         }
3394         return nfserr;
3395 }
3396
3397 static __be32
3398 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3399                          __be32 nfserr, struct svc_export *exp)
3400 {
3401         u32 i, nflavs, supported;
3402         struct exp_flavor_info *flavs;
3403         struct exp_flavor_info def_flavs[2];
3404         __be32 *p, *flavorsp;
3405         static bool report = true;
3406
3407         if (nfserr)
3408                 goto out;
3409         nfserr = nfserr_resource;
3410         if (exp->ex_nflavors) {
3411                 flavs = exp->ex_flavors;
3412                 nflavs = exp->ex_nflavors;
3413         } else { /* Handling of some defaults in absence of real secinfo: */
3414                 flavs = def_flavs;
3415                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3416                         nflavs = 2;
3417                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3418                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3419                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3420                         nflavs = 1;
3421                         flavs[0].pseudoflavor
3422                                         = svcauth_gss_flavor(exp->ex_client);
3423                 } else {
3424                         nflavs = 1;
3425                         flavs[0].pseudoflavor
3426                                         = exp->ex_client->flavour->flavour;
3427                 }
3428         }
3429
3430         supported = 0;
3431         p = xdr_reserve_space(xdr, 4);
3432         if (!p)
3433                 goto out;
3434         flavorsp = p++;         /* to be backfilled later */
3435
3436         for (i = 0; i < nflavs; i++) {
3437                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3438                 struct rpcsec_gss_info info;
3439
3440                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3441                         supported++;
3442                         p = xdr_reserve_space(xdr, 4 + 4 +
3443                                               XDR_LEN(info.oid.len) + 4 + 4);
3444                         if (!p)
3445                                 goto out;
3446                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3447                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3448                         *p++ = cpu_to_be32(info.qop);
3449                         *p++ = cpu_to_be32(info.service);
3450                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3451                         supported++;
3452                         p = xdr_reserve_space(xdr, 4);
3453                         if (!p)
3454                                 goto out;
3455                         *p++ = cpu_to_be32(pf);
3456                 } else {
3457                         if (report)
3458                                 pr_warn("NFS: SECINFO: security flavor %u "
3459                                         "is not supported\n", pf);
3460                 }
3461         }
3462
3463         if (nflavs != supported)
3464                 report = false;
3465         *flavorsp = htonl(supported);
3466         nfserr = 0;
3467 out:
3468         if (exp)
3469                 exp_put(exp);
3470         return nfserr;
3471 }
3472
3473 static __be32
3474 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3475                      struct nfsd4_secinfo *secinfo)
3476 {
3477         struct xdr_stream *xdr = &resp->xdr;
3478
3479         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3480 }
3481
3482 static __be32
3483 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3484                      struct nfsd4_secinfo_no_name *secinfo)
3485 {
3486         struct xdr_stream *xdr = &resp->xdr;
3487
3488         return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3489 }
3490
3491 /*
3492  * The SETATTR encode routine is special -- it always encodes a bitmap,
3493  * regardless of the error status.
3494  */
3495 static __be32
3496 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3497 {
3498         struct xdr_stream *xdr = &resp->xdr;
3499         __be32 *p;
3500
3501         p = xdr_reserve_space(xdr, 16);
3502         if (!p)
3503                 return nfserr_resource;
3504         if (nfserr) {
3505                 *p++ = cpu_to_be32(3);
3506                 *p++ = cpu_to_be32(0);
3507                 *p++ = cpu_to_be32(0);
3508                 *p++ = cpu_to_be32(0);
3509         }
3510         else {
3511                 *p++ = cpu_to_be32(3);
3512                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3513                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3514                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3515         }
3516         return nfserr;
3517 }
3518
3519 static __be32
3520 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3521 {
3522         struct xdr_stream *xdr = &resp->xdr;
3523         __be32 *p;
3524
3525         if (!nfserr) {
3526                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3527                 if (!p)
3528                         return nfserr_resource;
3529                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3530                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3531                                                 NFS4_VERIFIER_SIZE);
3532         }
3533         else if (nfserr == nfserr_clid_inuse) {
3534                 p = xdr_reserve_space(xdr, 8);
3535                 if (!p)
3536                         return nfserr_resource;
3537                 *p++ = cpu_to_be32(0);
3538                 *p++ = cpu_to_be32(0);
3539         }
3540         return nfserr;
3541 }
3542
3543 static __be32
3544 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3545 {
3546         struct xdr_stream *xdr = &resp->xdr;
3547         __be32 *p;
3548
3549         if (!nfserr) {
3550                 p = xdr_reserve_space(xdr, 16);
3551                 if (!p)
3552                         return nfserr_resource;
3553                 *p++ = cpu_to_be32(write->wr_bytes_written);
3554                 *p++ = cpu_to_be32(write->wr_how_written);
3555                 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3556                                                         NFS4_VERIFIER_SIZE);
3557         }
3558         return nfserr;
3559 }
3560
3561 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3562         [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3563               1 << (OP_EXCHANGE_ID - 32) |
3564               1 << (OP_CREATE_SESSION - 32) |
3565               1 << (OP_DESTROY_SESSION - 32) |
3566               1 << (OP_DESTROY_CLIENTID - 32)
3567 };
3568
3569 static __be32
3570 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3571                          struct nfsd4_exchange_id *exid)
3572 {
3573         struct xdr_stream *xdr = &resp->xdr;
3574         __be32 *p;
3575         char *major_id;
3576         char *server_scope;
3577         int major_id_sz;
3578         int server_scope_sz;
3579         uint64_t minor_id = 0;
3580
3581         if (nfserr)
3582                 return nfserr;
3583
3584         major_id = utsname()->nodename;
3585         major_id_sz = strlen(major_id);
3586         server_scope = utsname()->nodename;
3587         server_scope_sz = strlen(server_scope);
3588
3589         p = xdr_reserve_space(xdr,
3590                 8 /* eir_clientid */ +
3591                 4 /* eir_sequenceid */ +
3592                 4 /* eir_flags */ +
3593                 4 /* spr_how */);
3594         if (!p)
3595                 return nfserr_resource;
3596
3597         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3598         *p++ = cpu_to_be32(exid->seqid);
3599         *p++ = cpu_to_be32(exid->flags);
3600
3601         *p++ = cpu_to_be32(exid->spa_how);
3602
3603         switch (exid->spa_how) {
3604         case SP4_NONE:
3605                 break;
3606         case SP4_MACH_CRED:
3607                 /* spo_must_enforce, spo_must_allow */
3608                 p = xdr_reserve_space(xdr, 16);
3609                 if (!p)
3610                         return nfserr_resource;
3611
3612                 /* spo_must_enforce bitmap: */
3613                 *p++ = cpu_to_be32(2);
3614                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3615                 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3616                 /* empty spo_must_allow bitmap: */
3617                 *p++ = cpu_to_be32(0);
3618
3619                 break;
3620         default:
3621                 WARN_ON_ONCE(1);
3622         }
3623
3624         p = xdr_reserve_space(xdr,
3625                 8 /* so_minor_id */ +
3626                 4 /* so_major_id.len */ +
3627                 (XDR_QUADLEN(major_id_sz) * 4) +
3628                 4 /* eir_server_scope.len */ +
3629                 (XDR_QUADLEN(server_scope_sz) * 4) +
3630                 4 /* eir_server_impl_id.count (0) */);
3631         if (!p)
3632                 return nfserr_resource;
3633
3634         /* The server_owner struct */
3635         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3636         /* major id */
3637         p = xdr_encode_opaque(p, major_id, major_id_sz);
3638
3639         /* Server scope */
3640         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3641
3642         /* Implementation id */
3643         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3644         return 0;
3645 }
3646
3647 static __be32
3648 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3649                             struct nfsd4_create_session *sess)
3650 {
3651         struct xdr_stream *xdr = &resp->xdr;
3652         __be32 *p;
3653
3654         if (nfserr)
3655                 return nfserr;
3656
3657         p = xdr_reserve_space(xdr, 24);
3658         if (!p)
3659                 return nfserr_resource;
3660         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3661                                         NFS4_MAX_SESSIONID_LEN);
3662         *p++ = cpu_to_be32(sess->seqid);
3663         *p++ = cpu_to_be32(sess->flags);
3664
3665         p = xdr_reserve_space(xdr, 28);
3666         if (!p)
3667                 return nfserr_resource;
3668         *p++ = cpu_to_be32(0); /* headerpadsz */
3669         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3670         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3671         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3672         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3673         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3674         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3675
3676         if (sess->fore_channel.nr_rdma_attrs) {
3677                 p = xdr_reserve_space(xdr, 4);
3678                 if (!p)
3679                         return nfserr_resource;
3680                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3681         }
3682
3683         p = xdr_reserve_space(xdr, 28);
3684         if (!p)
3685                 return nfserr_resource;
3686         *p++ = cpu_to_be32(0); /* headerpadsz */
3687         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3688         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3689         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3690         *p++ = cpu_to_be32(sess->back_channel.maxops);
3691         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3692         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3693
3694         if (sess->back_channel.nr_rdma_attrs) {
3695                 p = xdr_reserve_space(xdr, 4);
3696                 if (!p)
3697                         return nfserr_resource;
3698                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3699         }
3700         return 0;
3701 }
3702
3703 static __be32
3704 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3705                       struct nfsd4_sequence *seq)
3706 {
3707         struct xdr_stream *xdr = &resp->xdr;
3708         __be32 *p;
3709
3710         if (nfserr)
3711                 return nfserr;
3712
3713         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3714         if (!p)
3715                 return nfserr_resource;
3716         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3717                                         NFS4_MAX_SESSIONID_LEN);
3718         *p++ = cpu_to_be32(seq->seqid);
3719         *p++ = cpu_to_be32(seq->slotid);
3720         /* Note slotid's are numbered from zero: */
3721         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3722         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3723         *p++ = cpu_to_be32(seq->status_flags);
3724
3725         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3726         return 0;
3727 }
3728
3729 static __be32
3730 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3731                           struct nfsd4_test_stateid *test_stateid)
3732 {
3733         struct xdr_stream *xdr = &resp->xdr;
3734         struct nfsd4_test_stateid_id *stateid, *next;
3735         __be32 *p;
3736
3737         if (nfserr)
3738                 return nfserr;
3739
3740         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3741         if (!p)
3742                 return nfserr_resource;
3743         *p++ = htonl(test_stateid->ts_num_ids);
3744
3745         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3746                 *p++ = stateid->ts_id_status;
3747         }
3748
3749         return nfserr;
3750 }
3751
3752 static __be32
3753 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3754 {
3755         return nfserr;
3756 }
3757
3758 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3759
3760 /*
3761  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3762  * since we don't need to filter out obsolete ops as this is
3763  * done in the decoding phase.
3764  */
3765 static nfsd4_enc nfsd4_enc_ops[] = {
3766         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3767         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3768         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3769         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3770         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3771         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3772         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3773         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3774         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3775         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3776         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3777         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3778         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3779         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3780         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3781         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3782         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3783         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3784         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3785         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3786         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3787         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3788         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3789         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3790         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3791         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3792         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3793         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3794         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3795         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3796         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3797         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3798         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3799         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3800         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3801         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3802         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3803
3804         /* NFSv4.1 operations */
3805         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3806         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3807         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3808         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3809         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
3810         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3811         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3812         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3813         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3814         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3815         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3816         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3817         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3818         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3819         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3820         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3821         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3822         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3823         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3824 };
3825
3826 /*
3827  * Calculate whether we still have space to encode repsize bytes.
3828  * There are two considerations:
3829  *     - For NFS versions >=4.1, the size of the reply must stay within
3830  *       session limits
3831  *     - For all NFS versions, we must stay within limited preallocated
3832  *       buffer space.
3833  *
3834  * This is called before the operation is processed, so can only provide
3835  * an upper estimate.  For some nonidempotent operations (such as
3836  * getattr), it's not necessarily a problem if that estimate is wrong,
3837  * as we can fail it after processing without significant side effects.
3838  */
3839 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3840 {
3841         struct xdr_buf *buf = &resp->rqstp->rq_res;
3842         struct nfsd4_slot *slot = resp->cstate.slot;
3843
3844         if (buf->len + respsize <= buf->buflen)
3845                 return nfs_ok;
3846         if (!nfsd4_has_session(&resp->cstate))
3847                 return nfserr_resource;
3848         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3849                 WARN_ON_ONCE(1);
3850                 return nfserr_rep_too_big_to_cache;
3851         }
3852         return nfserr_rep_too_big;
3853 }
3854
3855 void
3856 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3857 {
3858         struct xdr_stream *xdr = &resp->xdr;
3859         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3860         struct svc_rqst *rqstp = resp->rqstp;
3861         int post_err_offset;
3862         nfsd4_enc encoder;
3863         __be32 *p;
3864
3865         p = xdr_reserve_space(xdr, 8);
3866         if (!p) {
3867                 WARN_ON_ONCE(1);
3868                 return;
3869         }
3870         *p++ = cpu_to_be32(op->opnum);
3871         post_err_offset = xdr->buf->len;
3872
3873         if (op->opnum == OP_ILLEGAL)
3874                 goto status;
3875         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3876                !nfsd4_enc_ops[op->opnum]);
3877         encoder = nfsd4_enc_ops[op->opnum];
3878         op->status = encoder(resp, op->status, &op->u);
3879         xdr_commit_encode(xdr);
3880
3881         /* nfsd4_check_resp_size guarantees enough room for error status */
3882         if (!op->status) {
3883                 int space_needed = 0;
3884                 if (!nfsd4_last_compound_op(rqstp))
3885                         space_needed = COMPOUND_ERR_SLACK_SPACE;
3886                 op->status = nfsd4_check_resp_size(resp, space_needed);
3887         }
3888         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3889                 struct nfsd4_slot *slot = resp->cstate.slot;
3890
3891                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3892                         op->status = nfserr_rep_too_big_to_cache;
3893                 else
3894                         op->status = nfserr_rep_too_big;
3895         }
3896         if (op->status == nfserr_resource ||
3897             op->status == nfserr_rep_too_big ||
3898             op->status == nfserr_rep_too_big_to_cache) {
3899                 /*
3900                  * The operation may have already been encoded or
3901                  * partially encoded.  No op returns anything additional
3902                  * in the case of one of these three errors, so we can
3903                  * just truncate back to after the status.  But it's a
3904                  * bug if we had to do this on a non-idempotent op:
3905                  */
3906                 warn_on_nonidempotent_op(op);
3907                 xdr_truncate_encode(xdr, post_err_offset);
3908         }
3909         if (so) {
3910                 int len = xdr->buf->len - post_err_offset;
3911
3912                 so->so_replay.rp_status = op->status;
3913                 so->so_replay.rp_buflen = len;
3914                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3915                                                 so->so_replay.rp_buf, len);
3916         }
3917 status:
3918         /* Note that op->status is already in network byte order: */
3919         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3920 }
3921
3922 /*
3923  * Encode the reply stored in the stateowner reply cache
3924  *
3925  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3926  * previously sent already encoded operation.
3927  *
3928  * called with nfs4_lock_state() held
3929  */
3930 void
3931 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
3932 {
3933         __be32 *p;
3934         struct nfs4_replay *rp = op->replay;
3935
3936         BUG_ON(!rp);
3937
3938         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
3939         if (!p) {
3940                 WARN_ON_ONCE(1);
3941                 return;
3942         }
3943         *p++ = cpu_to_be32(op->opnum);
3944         *p++ = rp->rp_status;  /* already xdr'ed */
3945
3946         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
3947 }
3948
3949 int
3950 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3951 {
3952         return xdr_ressize_check(rqstp, p);
3953 }
3954
3955 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3956 {
3957         struct svc_rqst *rqstp = rq;
3958         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3959
3960         if (args->ops != args->iops) {
3961                 kfree(args->ops);
3962                 args->ops = args->iops;
3963         }
3964         kfree(args->tmpp);
3965         args->tmpp = NULL;
3966         while (args->to_free) {
3967                 struct tmpbuf *tb = args->to_free;
3968                 args->to_free = tb->next;
3969                 tb->release(tb->buf);
3970                 kfree(tb);
3971         }
3972         return 1;
3973 }
3974
3975 int
3976 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3977 {
3978         if (rqstp->rq_arg.head[0].iov_len % 4) {
3979                 /* client is nuts */
3980                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3981                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3982                 return 0;
3983         }
3984         args->p = p;
3985         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3986         args->pagelist = rqstp->rq_arg.pages;
3987         args->pagelen = rqstp->rq_arg.page_len;
3988         args->tmpp = NULL;
3989         args->to_free = NULL;
3990         args->ops = args->iops;
3991         args->rqstp = rqstp;
3992
3993         return !nfsd4_decode_compound(args);
3994 }
3995
3996 int
3997 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3998 {
3999         /*
4000          * All that remains is to write the tag and operation count...
4001          */
4002         struct nfsd4_compound_state *cs = &resp->cstate;
4003         struct xdr_buf *buf = resp->xdr.buf;
4004
4005         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4006                                  buf->tail[0].iov_len);
4007
4008         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4009
4010         p = resp->tagp;
4011         *p++ = htonl(resp->taglen);
4012         memcpy(p, resp->tag, resp->taglen);
4013         p += XDR_QUADLEN(resp->taglen);
4014         *p++ = htonl(resp->opcnt);
4015
4016         if (nfsd4_has_session(cs)) {
4017                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4018                 struct nfs4_client *clp = cs->session->se_client;
4019                 if (cs->status != nfserr_replay_cache) {
4020                         nfsd4_store_cache_entry(resp);
4021                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4022                 }
4023                 /* Renew the clientid on success and on replay */
4024                 spin_lock(&nn->client_lock);
4025                 nfsd4_put_session(cs->session);
4026                 spin_unlock(&nn->client_lock);
4027                 put_client_renew(clp);
4028         }
4029         return 1;
4030 }
4031
4032 /*
4033  * Local variables:
4034  *  c-basic-offset: 8
4035  * End:
4036  */