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 <[email protected]>
   8  *  Andy Adamson   <[email protected]>
   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
  36 #include <linux/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43 #include <linux/sunrpc/addr.h>
  44
  45 #include "idmap.h"
  46 #include "acl.h"
  47 #include "xdr4.h"
  48 #include "vfs.h"
  49 #include "state.h"
  50 #include "cache.h"
  51 #include "netns.h"
  52 #include "pnfs.h"
  53 #include "filecache.h"
  54
  55 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  56 #include <linux/security.h>
  57 #endif
  58
  59
  60 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  61
  62 const u32 nfsd_suppattrs[3][3] = {
  63         {NFSD4_SUPPORTED_ATTRS_WORD0,
  64          NFSD4_SUPPORTED_ATTRS_WORD1,
  65          NFSD4_SUPPORTED_ATTRS_WORD2},
  66
  67         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  68          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  69          NFSD4_1_SUPPORTED_ATTRS_WORD2},
  70
  71         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  72          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  73          NFSD4_2_SUPPORTED_ATTRS_WORD2},
  74 };
  75
  76 /*
  77  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  78  * directory in order to indicate to the client that a filesystem boundary is present
  79  * We use a fixed fsid for a referral
  80  */
  81 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  82 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  83
  84 static __be32
  85 check_filename(char *str, int len)
  86 {
  87         int i;
  88
  89         if (len == 0)
  90                 return nfserr_inval;
  91         if (isdotent(str, len))
  92                 return nfserr_badname;
  93         for (i = 0; i < len; i++)
  94                 if (str[i] == '/')
  95                         return nfserr_badname;
  96         return 0;
  97 }
  98
  99 #define DECODE_HEAD                             \
 100         __be32 *p;                              \
 101         __be32 status
 102 #define DECODE_TAIL                             \
 103         status = 0;                             \
 104 out:                                            \
 105         return status;                          \
 106 xdr_error:                                      \
 107         dprintk("NFSD: xdr error (%s:%d)\n",    \
 108                         __FILE__, __LINE__);    \
 109         status = nfserr_bad_xdr;                \
 110         goto out
 111
 112 #define READMEM(x,nbytes) do {                  \
 113         x = (char *)p;                          \
 114         p += XDR_QUADLEN(nbytes);               \
 115 } while (0)
 116 #define SAVEMEM(x,nbytes) do {                  \
 117         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 118                 savemem(argp, p, nbytes) :      \
 119                 (char *)p)) {                   \
 120                 dprintk("NFSD: xdr error (%s:%d)\n", \
 121                                 __FILE__, __LINE__); \
 122                 goto xdr_error;                 \
 123                 }                               \
 124         p += XDR_QUADLEN(nbytes);               \
 125 } while (0)
 126 #define COPYMEM(x,nbytes) do {                  \
 127         memcpy((x), p, nbytes);                 \
 128         p += XDR_QUADLEN(nbytes);               \
 129 } while (0)
 130
 131 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 132 #define READ_BUF(nbytes)  do {                  \
 133         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 134                 p = argp->p;                    \
 135                 argp->p += XDR_QUADLEN(nbytes); \
 136         } else if (!(p = read_buf(argp, nbytes))) { \
 137                 dprintk("NFSD: xdr error (%s:%d)\n", \
 138                                 __FILE__, __LINE__); \
 139                 goto xdr_error;                 \
 140         }                                       \
 141 } while (0)
 142
 143 static void next_decode_page(struct nfsd4_compoundargs *argp)
 144 {
 145         argp->p = page_address(argp->pagelist[0]);
 146         argp->pagelist++;
 147         if (argp->pagelen < PAGE_SIZE) {
 148                 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
 149                 argp->pagelen = 0;
 150         } else {
 151                 argp->end = argp->p + (PAGE_SIZE>>2);
 152                 argp->pagelen -= PAGE_SIZE;
 153         }
 154 }
 155
 156 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 157 {
 158         /* We want more bytes than seem to be available.
 159          * Maybe we need a new page, maybe we have just run out
 160          */
 161         unsigned int avail = (char *)argp->end - (char *)argp->p;
 162         __be32 *p;
 163
 164         if (argp->pagelen == 0) {
 165                 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
 166
 167                 if (!argp->tail) {
 168                         argp->tail = true;
 169                         avail = vec->iov_len;
 170                         argp->p = vec->iov_base;
 171                         argp->end = vec->iov_base + avail;
 172                 }
 173
 174                 if (avail < nbytes)
 175                         return NULL;
 176
 177                 p = argp->p;
 178                 argp->p += XDR_QUADLEN(nbytes);
 179                 return p;
 180         }
 181
 182         if (avail + argp->pagelen < nbytes)
 183                 return NULL;
 184         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 185                 return NULL;
 186         /* ok, we can do it with the current plus the next page */
 187         if (nbytes <= sizeof(argp->tmp))
 188                 p = argp->tmp;
 189         else {
 190                 kfree(argp->tmpp);
 191                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 192                 if (!p)
 193                         return NULL;
 194
 195         }
 196         /*
 197          * The following memcpy is safe because read_buf is always
 198          * called with nbytes > avail, and the two cases above both
 199          * guarantee p points to at least nbytes bytes.
 200          */
 201         memcpy(p, argp->p, avail);
 202         next_decode_page(argp);
 203         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 204         argp->p += XDR_QUADLEN(nbytes - avail);
 205         return p;
 206 }
 207
 208 static unsigned int compoundargs_bytes_left(struct nfsd4_compoundargs *argp)
 209 {
 210         unsigned int this = (char *)argp->end - (char *)argp->p;
 211
 212         return this + argp->pagelen;
 213 }
 214
 215 static int zero_clientid(clientid_t *clid)
 216 {
 217         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 218 }
 219
 220 /**
 221  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 222  * @argp: NFSv4 compound argument structure
 223  * @len: length of buffer to allocate
 224  *
 225  * Allocates a buffer of size @len to be freed when processing the compound
 226  * operation described in @argp finishes.
 227  */
 228 static void *
 229 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 230 {
 231         struct svcxdr_tmpbuf *tb;
 232
 233         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 234         if (!tb)
 235                 return NULL;
 236         tb->next = argp->to_free;
 237         argp->to_free = tb;
 238         return tb->buf;
 239 }
 240
 241 /*
 242  * For xdr strings that need to be passed to other kernel api's
 243  * as null-terminated strings.
 244  *
 245  * Note null-terminating in place usually isn't safe since the
 246  * buffer might end on a page boundary.
 247  */
 248 static char *
 249 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 250 {
 251         char *p = svcxdr_tmpalloc(argp, len + 1);
 252
 253         if (!p)
 254                 return NULL;
 255         memcpy(p, buf, len);
 256         p[len] = '\0';
 257         return p;
 258 }
 259
 260 /**
 261  * savemem - duplicate a chunk of memory for later processing
 262  * @argp: NFSv4 compound argument structure to be freed with
 263  * @p: pointer to be duplicated
 264  * @nbytes: length to be duplicated
 265  *
 266  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 267  * that are preserved until processing of the NFSv4 compound
 268  * operation described by @argp finishes.
 269  */
 270 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 271 {
 272         void *ret;
 273
 274         ret = svcxdr_tmpalloc(argp, nbytes);
 275         if (!ret)
 276                 return NULL;
 277         memcpy(ret, p, nbytes);
 278         return ret;
 279 }
 280
 281 static __be32
 282 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
 283 {
 284         DECODE_HEAD;
 285
 286         READ_BUF(12);
 287         p = xdr_decode_hyper(p, &tv->tv_sec);
 288         tv->tv_nsec = be32_to_cpup(p++);
 289         if (tv->tv_nsec >= (u32)1000000000)
 290                 return nfserr_inval;
 291
 292         DECODE_TAIL;
 293 }
 294
 295 static __be32
 296 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 297 {
 298         u32 bmlen;
 299         DECODE_HEAD;
 300
 301         bmval[0] = 0;
 302         bmval[1] = 0;
 303         bmval[2] = 0;
 304
 305         READ_BUF(4);
 306         bmlen = be32_to_cpup(p++);
 307         if (bmlen > 1000)
 308                 goto xdr_error;
 309
 310         READ_BUF(bmlen << 2);
 311         if (bmlen > 0)
 312                 bmval[0] = be32_to_cpup(p++);
 313         if (bmlen > 1)
 314                 bmval[1] = be32_to_cpup(p++);
 315         if (bmlen > 2)
 316                 bmval[2] = be32_to_cpup(p++);
 317
 318         DECODE_TAIL;
 319 }
 320
 321 static __be32
 322 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 323                    struct iattr *iattr, struct nfs4_acl **acl,
 324                    struct xdr_netobj *label, int *umask)
 325 {
 326         int expected_len, len = 0;
 327         u32 dummy32;
 328         char *buf;
 329
 330         DECODE_HEAD;
 331         iattr->ia_valid = 0;
 332         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 333                 return status;
 334
 335         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 336             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 337             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
 338                 if (nfsd_attrs_supported(argp->minorversion, bmval))
 339                         return nfserr_inval;
 340                 return nfserr_attrnotsupp;
 341         }
 342
 343         READ_BUF(4);
 344         expected_len = be32_to_cpup(p++);
 345
 346         if (bmval[0] & FATTR4_WORD0_SIZE) {
 347                 READ_BUF(8);
 348                 len += 8;
 349                 p = xdr_decode_hyper(p, &iattr->ia_size);
 350                 iattr->ia_valid |= ATTR_SIZE;
 351         }
 352         if (bmval[0] & FATTR4_WORD0_ACL) {
 353                 u32 nace;
 354                 struct nfs4_ace *ace;
 355
 356                 READ_BUF(4); len += 4;
 357                 nace = be32_to_cpup(p++);
 358
 359                 if (nace > compoundargs_bytes_left(argp)/20)
 360                         /*
 361                          * Even with 4-byte names there wouldn't be
 362                          * space for that many aces; something fishy is
 363                          * going on:
 364                          */
 365                         return nfserr_fbig;
 366
 367                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 368                 if (*acl == NULL)
 369                         return nfserr_jukebox;
 370
 371                 (*acl)->naces = nace;
 372                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 373                         READ_BUF(16); len += 16;
 374                         ace->type = be32_to_cpup(p++);
 375                         ace->flag = be32_to_cpup(p++);
 376                         ace->access_mask = be32_to_cpup(p++);
 377                         dummy32 = be32_to_cpup(p++);
 378                         READ_BUF(dummy32);
 379                         len += XDR_QUADLEN(dummy32) << 2;
 380                         READMEM(buf, dummy32);
 381                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 382                         status = nfs_ok;
 383                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 384                                 ;
 385                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 386                                 status = nfsd_map_name_to_gid(argp->rqstp,
 387                                                 buf, dummy32, &ace->who_gid);
 388                         else
 389                                 status = nfsd_map_name_to_uid(argp->rqstp,
 390                                                 buf, dummy32, &ace->who_uid);
 391                         if (status)
 392                                 return status;
 393                 }
 394         } else
 395                 *acl = NULL;
 396         if (bmval[1] & FATTR4_WORD1_MODE) {
 397                 READ_BUF(4);
 398                 len += 4;
 399                 iattr->ia_mode = be32_to_cpup(p++);
 400                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 401                 iattr->ia_valid |= ATTR_MODE;
 402         }
 403         if (bmval[1] & FATTR4_WORD1_OWNER) {
 404                 READ_BUF(4);
 405                 len += 4;
 406                 dummy32 = be32_to_cpup(p++);
 407                 READ_BUF(dummy32);
 408                 len += (XDR_QUADLEN(dummy32) << 2);
 409                 READMEM(buf, dummy32);
 410                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 411                         return status;
 412                 iattr->ia_valid |= ATTR_UID;
 413         }
 414         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 415                 READ_BUF(4);
 416                 len += 4;
 417                 dummy32 = be32_to_cpup(p++);
 418                 READ_BUF(dummy32);
 419                 len += (XDR_QUADLEN(dummy32) << 2);
 420                 READMEM(buf, dummy32);
 421                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 422                         return status;
 423                 iattr->ia_valid |= ATTR_GID;
 424         }
 425         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 426                 READ_BUF(4);
 427                 len += 4;
 428                 dummy32 = be32_to_cpup(p++);
 429                 switch (dummy32) {
 430                 case NFS4_SET_TO_CLIENT_TIME:
 431                         len += 12;
 432                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 433                         if (status)
 434                                 return status;
 435                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 436                         break;
 437                 case NFS4_SET_TO_SERVER_TIME:
 438                         iattr->ia_valid |= ATTR_ATIME;
 439                         break;
 440                 default:
 441                         goto xdr_error;
 442                 }
 443         }
 444         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 445                 READ_BUF(4);
 446                 len += 4;
 447                 dummy32 = be32_to_cpup(p++);
 448                 switch (dummy32) {
 449                 case NFS4_SET_TO_CLIENT_TIME:
 450                         len += 12;
 451                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 452                         if (status)
 453                                 return status;
 454                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 455                         break;
 456                 case NFS4_SET_TO_SERVER_TIME:
 457                         iattr->ia_valid |= ATTR_MTIME;
 458                         break;
 459                 default:
 460                         goto xdr_error;
 461                 }
 462         }
 463
 464         label->len = 0;
 465         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
 466             bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 467                 READ_BUF(4);
 468                 len += 4;
 469                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 470                 READ_BUF(4);
 471                 len += 4;
 472                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 473                 READ_BUF(4);
 474                 len += 4;
 475                 dummy32 = be32_to_cpup(p++);
 476                 READ_BUF(dummy32);
 477                 if (dummy32 > NFS4_MAXLABELLEN)
 478                         return nfserr_badlabel;
 479                 len += (XDR_QUADLEN(dummy32) << 2);
 480                 READMEM(buf, dummy32);
 481                 label->len = dummy32;
 482                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 483                 if (!label->data)
 484                         return nfserr_jukebox;
 485         }
 486         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 487                 if (!umask)
 488                         goto xdr_error;
 489                 READ_BUF(8);
 490                 len += 8;
 491                 dummy32 = be32_to_cpup(p++);
 492                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
 493                 dummy32 = be32_to_cpup(p++);
 494                 *umask = dummy32 & S_IRWXUGO;
 495                 iattr->ia_valid |= ATTR_MODE;
 496         }
 497         if (len != expected_len)
 498                 goto xdr_error;
 499
 500         DECODE_TAIL;
 501 }
 502
 503 static __be32
 504 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 505 {
 506         DECODE_HEAD;
 507
 508         READ_BUF(sizeof(stateid_t));
 509         sid->si_generation = be32_to_cpup(p++);
 510         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 511
 512         DECODE_TAIL;
 513 }
 514
 515 static __be32
 516 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 517 {
 518         DECODE_HEAD;
 519
 520         READ_BUF(4);
 521         access->ac_req_access = be32_to_cpup(p++);
 522
 523         DECODE_TAIL;
 524 }
 525
 526 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 527 {
 528         DECODE_HEAD;
 529         struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
 530         u32 dummy, uid, gid;
 531         char *machine_name;
 532         int i;
 533         int nr_secflavs;
 534
 535         /* callback_sec_params4 */
 536         READ_BUF(4);
 537         nr_secflavs = be32_to_cpup(p++);
 538         if (nr_secflavs)
 539                 cbs->flavor = (u32)(-1);
 540         else
 541                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 542                 cbs->flavor = 0;
 543         for (i = 0; i < nr_secflavs; ++i) {
 544                 READ_BUF(4);
 545                 dummy = be32_to_cpup(p++);
 546                 switch (dummy) {
 547                 case RPC_AUTH_NULL:
 548                         /* Nothing to read */
 549                         if (cbs->flavor == (u32)(-1))
 550                                 cbs->flavor = RPC_AUTH_NULL;
 551                         break;
 552                 case RPC_AUTH_UNIX:
 553                         READ_BUF(8);
 554                         /* stamp */
 555                         dummy = be32_to_cpup(p++);
 556
 557                         /* machine name */
 558                         dummy = be32_to_cpup(p++);
 559                         READ_BUF(dummy);
 560                         SAVEMEM(machine_name, dummy);
 561
 562                         /* uid, gid */
 563                         READ_BUF(8);
 564                         uid = be32_to_cpup(p++);
 565                         gid = be32_to_cpup(p++);
 566
 567                         /* more gids */
 568                         READ_BUF(4);
 569                         dummy = be32_to_cpup(p++);
 570                         READ_BUF(dummy * 4);
 571                         if (cbs->flavor == (u32)(-1)) {
 572                                 kuid_t kuid = make_kuid(userns, uid);
 573                                 kgid_t kgid = make_kgid(userns, gid);
 574                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 575                                         cbs->uid = kuid;
 576                                         cbs->gid = kgid;
 577                                         cbs->flavor = RPC_AUTH_UNIX;
 578                                 } else {
 579                                         dprintk("RPC_AUTH_UNIX with invalid"
 580                                                 "uid or gid ignoring!\n");
 581                                 }
 582                         }
 583                         break;
 584                 case RPC_AUTH_GSS:
 585                         dprintk("RPC_AUTH_GSS callback secflavor "
 586                                 "not supported!\n");
 587                         READ_BUF(8);
 588                         /* gcbp_service */
 589                         dummy = be32_to_cpup(p++);
 590                         /* gcbp_handle_from_server */
 591                         dummy = be32_to_cpup(p++);
 592                         READ_BUF(dummy);
 593                         p += XDR_QUADLEN(dummy);
 594                         /* gcbp_handle_from_client */
 595                         READ_BUF(4);
 596                         dummy = be32_to_cpup(p++);
 597                         READ_BUF(dummy);
 598                         break;
 599                 default:
 600                         dprintk("Illegal callback secflavor\n");
 601                         return nfserr_inval;
 602                 }
 603         }
 604         DECODE_TAIL;
 605 }
 606
 607 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 608 {
 609         DECODE_HEAD;
 610
 611         READ_BUF(4);
 612         bc->bc_cb_program = be32_to_cpup(p++);
 613         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 614
 615         DECODE_TAIL;
 616 }
 617
 618 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 619 {
 620         DECODE_HEAD;
 621
 622         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 623         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 624         bcts->dir = be32_to_cpup(p++);
 625         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 626          * could help us figure out we should be using it. */
 627         DECODE_TAIL;
 628 }
 629
 630 static __be32
 631 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 632 {
 633         DECODE_HEAD;
 634
 635         READ_BUF(4);
 636         close->cl_seqid = be32_to_cpup(p++);
 637         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 638
 639         DECODE_TAIL;
 640 }
 641
 642
 643 static __be32
 644 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 645 {
 646         DECODE_HEAD;
 647
 648         READ_BUF(12);
 649         p = xdr_decode_hyper(p, &commit->co_offset);
 650         commit->co_count = be32_to_cpup(p++);
 651
 652         DECODE_TAIL;
 653 }
 654
 655 static __be32
 656 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 657 {
 658         DECODE_HEAD;
 659
 660         READ_BUF(4);
 661         create->cr_type = be32_to_cpup(p++);
 662         switch (create->cr_type) {
 663         case NF4LNK:
 664                 READ_BUF(4);
 665                 create->cr_datalen = be32_to_cpup(p++);
 666                 READ_BUF(create->cr_datalen);
 667                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 668                 if (!create->cr_data)
 669                         return nfserr_jukebox;
 670                 break;
 671         case NF4BLK:
 672         case NF4CHR:
 673                 READ_BUF(8);
 674                 create->cr_specdata1 = be32_to_cpup(p++);
 675                 create->cr_specdata2 = be32_to_cpup(p++);
 676                 break;
 677         case NF4SOCK:
 678         case NF4FIFO:
 679         case NF4DIR:
 680         default:
 681                 break;
 682         }
 683
 684         READ_BUF(4);
 685         create->cr_namelen = be32_to_cpup(p++);
 686         READ_BUF(create->cr_namelen);
 687         SAVEMEM(create->cr_name, create->cr_namelen);
 688         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 689                 return status;
 690
 691         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 692                                     &create->cr_acl, &create->cr_label,
 693                                     &create->cr_umask);
 694         if (status)
 695                 goto out;
 696
 697         DECODE_TAIL;
 698 }
 699
 700 static inline __be32
 701 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 702 {
 703         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 704 }
 705
 706 static inline __be32
 707 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 708 {
 709         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 710 }
 711
 712 static __be32
 713 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 714 {
 715         DECODE_HEAD;
 716
 717         READ_BUF(4);
 718         link->li_namelen = be32_to_cpup(p++);
 719         READ_BUF(link->li_namelen);
 720         SAVEMEM(link->li_name, link->li_namelen);
 721         if ((status = check_filename(link->li_name, link->li_namelen)))
 722                 return status;
 723
 724         DECODE_TAIL;
 725 }
 726
 727 static __be32
 728 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 729 {
 730         DECODE_HEAD;
 731
 732         /*
 733         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 734         */
 735         READ_BUF(28);
 736         lock->lk_type = be32_to_cpup(p++);
 737         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 738                 goto xdr_error;
 739         lock->lk_reclaim = be32_to_cpup(p++);
 740         p = xdr_decode_hyper(p, &lock->lk_offset);
 741         p = xdr_decode_hyper(p, &lock->lk_length);
 742         lock->lk_is_new = be32_to_cpup(p++);
 743
 744         if (lock->lk_is_new) {
 745                 READ_BUF(4);
 746                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 747                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 748                 if (status)
 749                         return status;
 750                 READ_BUF(8 + sizeof(clientid_t));
 751                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 752                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 753                 lock->lk_new_owner.len = be32_to_cpup(p++);
 754                 READ_BUF(lock->lk_new_owner.len);
 755                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 756         } else {
 757                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 758                 if (status)
 759                         return status;
 760                 READ_BUF(4);
 761                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 762         }
 763
 764         DECODE_TAIL;
 765 }
 766
 767 static __be32
 768 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 769 {
 770         DECODE_HEAD;
 771
 772         READ_BUF(32);
 773         lockt->lt_type = be32_to_cpup(p++);
 774         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 775                 goto xdr_error;
 776         p = xdr_decode_hyper(p, &lockt->lt_offset);
 777         p = xdr_decode_hyper(p, &lockt->lt_length);
 778         COPYMEM(&lockt->lt_clientid, 8);
 779         lockt->lt_owner.len = be32_to_cpup(p++);
 780         READ_BUF(lockt->lt_owner.len);
 781         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 782
 783         DECODE_TAIL;
 784 }
 785
 786 static __be32
 787 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 788 {
 789         DECODE_HEAD;
 790
 791         READ_BUF(8);
 792         locku->lu_type = be32_to_cpup(p++);
 793         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 794                 goto xdr_error;
 795         locku->lu_seqid = be32_to_cpup(p++);
 796         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 797         if (status)
 798                 return status;
 799         READ_BUF(16);
 800         p = xdr_decode_hyper(p, &locku->lu_offset);
 801         p = xdr_decode_hyper(p, &locku->lu_length);
 802
 803         DECODE_TAIL;
 804 }
 805
 806 static __be32
 807 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 808 {
 809         DECODE_HEAD;
 810
 811         READ_BUF(4);
 812         lookup->lo_len = be32_to_cpup(p++);
 813         READ_BUF(lookup->lo_len);
 814         SAVEMEM(lookup->lo_name, lookup->lo_len);
 815         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 816                 return status;
 817
 818         DECODE_TAIL;
 819 }
 820
 821 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 822 {
 823         __be32 *p;
 824         u32 w;
 825
 826         READ_BUF(4);
 827         w = be32_to_cpup(p++);
 828         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 829         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 830         if (deleg_when)
 831                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 832
 833         switch (w & NFS4_SHARE_ACCESS_MASK) {
 834         case NFS4_SHARE_ACCESS_READ:
 835         case NFS4_SHARE_ACCESS_WRITE:
 836         case NFS4_SHARE_ACCESS_BOTH:
 837                 break;
 838         default:
 839                 return nfserr_bad_xdr;
 840         }
 841         w &= ~NFS4_SHARE_ACCESS_MASK;
 842         if (!w)
 843                 return nfs_ok;
 844         if (!argp->minorversion)
 845                 return nfserr_bad_xdr;
 846         switch (w & NFS4_SHARE_WANT_MASK) {
 847         case NFS4_SHARE_WANT_NO_PREFERENCE:
 848         case NFS4_SHARE_WANT_READ_DELEG:
 849         case NFS4_SHARE_WANT_WRITE_DELEG:
 850         case NFS4_SHARE_WANT_ANY_DELEG:
 851         case NFS4_SHARE_WANT_NO_DELEG:
 852         case NFS4_SHARE_WANT_CANCEL:
 853                 break;
 854         default:
 855                 return nfserr_bad_xdr;
 856         }
 857         w &= ~NFS4_SHARE_WANT_MASK;
 858         if (!w)
 859                 return nfs_ok;
 860
 861         if (!deleg_when)        /* open_downgrade */
 862                 return nfserr_inval;
 863         switch (w) {
 864         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 865         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 866         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 867               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 868                 return nfs_ok;
 869         }
 870 xdr_error:
 871         return nfserr_bad_xdr;
 872 }
 873
 874 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 875 {
 876         __be32 *p;
 877
 878         READ_BUF(4);
 879         *x = be32_to_cpup(p++);
 880         /* Note: unlinke access bits, deny bits may be zero. */
 881         if (*x & ~NFS4_SHARE_DENY_BOTH)
 882                 return nfserr_bad_xdr;
 883         return nfs_ok;
 884 xdr_error:
 885         return nfserr_bad_xdr;
 886 }
 887
 888 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 889 {
 890         __be32 *p;
 891
 892         READ_BUF(4);
 893         o->len = be32_to_cpup(p++);
 894
 895         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 896                 return nfserr_bad_xdr;
 897
 898         READ_BUF(o->len);
 899         SAVEMEM(o->data, o->len);
 900         return nfs_ok;
 901 xdr_error:
 902         return nfserr_bad_xdr;
 903 }
 904
 905 static __be32
 906 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 907 {
 908         DECODE_HEAD;
 909         u32 dummy;
 910
 911         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 912         open->op_iattr.ia_valid = 0;
 913         open->op_openowner = NULL;
 914
 915         open->op_xdr_error = 0;
 916         /* seqid, share_access, share_deny, clientid, ownerlen */
 917         READ_BUF(4);
 918         open->op_seqid = be32_to_cpup(p++);
 919         /* decode, yet ignore deleg_when until supported */
 920         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 921                                            &open->op_deleg_want, &dummy);
 922         if (status)
 923                 goto xdr_error;
 924         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 925         if (status)
 926                 goto xdr_error;
 927         READ_BUF(sizeof(clientid_t));
 928         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 929         status = nfsd4_decode_opaque(argp, &open->op_owner);
 930         if (status)
 931                 goto xdr_error;
 932         READ_BUF(4);
 933         open->op_create = be32_to_cpup(p++);
 934         switch (open->op_create) {
 935         case NFS4_OPEN_NOCREATE:
 936                 break;
 937         case NFS4_OPEN_CREATE:
 938                 READ_BUF(4);
 939                 open->op_createmode = be32_to_cpup(p++);
 940                 switch (open->op_createmode) {
 941                 case NFS4_CREATE_UNCHECKED:
 942                 case NFS4_CREATE_GUARDED:
 943                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 944                                 &open->op_iattr, &open->op_acl, &open->op_label,
 945                                 &open->op_umask);
 946                         if (status)
 947                                 goto out;
 948                         break;
 949                 case NFS4_CREATE_EXCLUSIVE:
 950                         READ_BUF(NFS4_VERIFIER_SIZE);
 951                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 952                         break;
 953                 case NFS4_CREATE_EXCLUSIVE4_1:
 954                         if (argp->minorversion < 1)
 955                                 goto xdr_error;
 956                         READ_BUF(NFS4_VERIFIER_SIZE);
 957                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 958                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 959                                 &open->op_iattr, &open->op_acl, &open->op_label,
 960                                 &open->op_umask);
 961                         if (status)
 962                                 goto out;
 963                         break;
 964                 default:
 965                         goto xdr_error;
 966                 }
 967                 break;
 968         default:
 969                 goto xdr_error;
 970         }
 971
 972         /* open_claim */
 973         READ_BUF(4);
 974         open->op_claim_type = be32_to_cpup(p++);
 975         switch (open->op_claim_type) {
 976         case NFS4_OPEN_CLAIM_NULL:
 977         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 978                 READ_BUF(4);
 979                 open->op_fname.len = be32_to_cpup(p++);
 980                 READ_BUF(open->op_fname.len);
 981                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 982                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 983                         return status;
 984                 break;
 985         case NFS4_OPEN_CLAIM_PREVIOUS:
 986                 READ_BUF(4);
 987                 open->op_delegate_type = be32_to_cpup(p++);
 988                 break;
 989         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 990                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 991                 if (status)
 992                         return status;
 993                 READ_BUF(4);
 994                 open->op_fname.len = be32_to_cpup(p++);
 995                 READ_BUF(open->op_fname.len);
 996                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 997                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 998                         return status;
 999                 break;
1000         case NFS4_OPEN_CLAIM_FH:
1001         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1002                 if (argp->minorversion < 1)
1003                         goto xdr_error;
1004                 /* void */
1005                 break;
1006         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1007                 if (argp->minorversion < 1)
1008                         goto xdr_error;
1009                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1010                 if (status)
1011                         return status;
1012                 break;
1013         default:
1014                 goto xdr_error;
1015         }
1016
1017         DECODE_TAIL;
1018 }
1019
1020 static __be32
1021 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1022 {
1023         DECODE_HEAD;
1024
1025         if (argp->minorversion >= 1)
1026                 return nfserr_notsupp;
1027
1028         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1029         if (status)
1030                 return status;
1031         READ_BUF(4);
1032         open_conf->oc_seqid = be32_to_cpup(p++);
1033
1034         DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1039 {
1040         DECODE_HEAD;
1041
1042         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1043         if (status)
1044                 return status;
1045         READ_BUF(4);
1046         open_down->od_seqid = be32_to_cpup(p++);
1047         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1048                                            &open_down->od_deleg_want, NULL);
1049         if (status)
1050                 return status;
1051         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1052         if (status)
1053                 return status;
1054         DECODE_TAIL;
1055 }
1056
1057 static __be32
1058 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1059 {
1060         DECODE_HEAD;
1061
1062         READ_BUF(4);
1063         putfh->pf_fhlen = be32_to_cpup(p++);
1064         if (putfh->pf_fhlen > NFS4_FHSIZE)
1065                 goto xdr_error;
1066         READ_BUF(putfh->pf_fhlen);
1067         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1068
1069         DECODE_TAIL;
1070 }
1071
1072 static __be32
1073 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1074 {
1075         if (argp->minorversion == 0)
1076                 return nfs_ok;
1077         return nfserr_notsupp;
1078 }
1079
1080 static __be32
1081 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1082 {
1083         DECODE_HEAD;
1084
1085         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1086         if (status)
1087                 return status;
1088         READ_BUF(12);
1089         p = xdr_decode_hyper(p, &read->rd_offset);
1090         read->rd_length = be32_to_cpup(p++);
1091
1092         DECODE_TAIL;
1093 }
1094
1095 static __be32
1096 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1097 {
1098         DECODE_HEAD;
1099
1100         READ_BUF(24);
1101         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1102         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1103         readdir->rd_dircount = be32_to_cpup(p++);
1104         readdir->rd_maxcount = be32_to_cpup(p++);
1105         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1106                 goto out;
1107
1108         DECODE_TAIL;
1109 }
1110
1111 static __be32
1112 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1113 {
1114         DECODE_HEAD;
1115
1116         READ_BUF(4);
1117         remove->rm_namelen = be32_to_cpup(p++);
1118         READ_BUF(remove->rm_namelen);
1119         SAVEMEM(remove->rm_name, remove->rm_namelen);
1120         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1121                 return status;
1122
1123         DECODE_TAIL;
1124 }
1125
1126 static __be32
1127 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1128 {
1129         DECODE_HEAD;
1130
1131         READ_BUF(4);
1132         rename->rn_snamelen = be32_to_cpup(p++);
1133         READ_BUF(rename->rn_snamelen);
1134         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1135         READ_BUF(4);
1136         rename->rn_tnamelen = be32_to_cpup(p++);
1137         READ_BUF(rename->rn_tnamelen);
1138         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1139         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1140                 return status;
1141         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1142                 return status;
1143
1144         DECODE_TAIL;
1145 }
1146
1147 static __be32
1148 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1149 {
1150         DECODE_HEAD;
1151
1152         if (argp->minorversion >= 1)
1153                 return nfserr_notsupp;
1154
1155         READ_BUF(sizeof(clientid_t));
1156         COPYMEM(clientid, sizeof(clientid_t));
1157
1158         DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1163                      struct nfsd4_secinfo *secinfo)
1164 {
1165         DECODE_HEAD;
1166
1167         READ_BUF(4);
1168         secinfo->si_namelen = be32_to_cpup(p++);
1169         READ_BUF(secinfo->si_namelen);
1170         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1171         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1172         if (status)
1173                 return status;
1174         DECODE_TAIL;
1175 }
1176
1177 static __be32
1178 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1179                      struct nfsd4_secinfo_no_name *sin)
1180 {
1181         DECODE_HEAD;
1182
1183         READ_BUF(4);
1184         sin->sin_style = be32_to_cpup(p++);
1185         DECODE_TAIL;
1186 }
1187
1188 static __be32
1189 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1190 {
1191         __be32 status;
1192
1193         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1194         if (status)
1195                 return status;
1196         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1197                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1198 }
1199
1200 static __be32
1201 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1202 {
1203         DECODE_HEAD;
1204
1205         if (argp->minorversion >= 1)
1206                 return nfserr_notsupp;
1207
1208         READ_BUF(NFS4_VERIFIER_SIZE);
1209         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1210
1211         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1212         if (status)
1213                 return nfserr_bad_xdr;
1214         READ_BUF(8);
1215         setclientid->se_callback_prog = be32_to_cpup(p++);
1216         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1217         READ_BUF(setclientid->se_callback_netid_len);
1218         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1219         READ_BUF(4);
1220         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1221
1222         READ_BUF(setclientid->se_callback_addr_len);
1223         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1224         READ_BUF(4);
1225         setclientid->se_callback_ident = be32_to_cpup(p++);
1226
1227         DECODE_TAIL;
1228 }
1229
1230 static __be32
1231 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1232 {
1233         DECODE_HEAD;
1234
1235         if (argp->minorversion >= 1)
1236                 return nfserr_notsupp;
1237
1238         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1239         COPYMEM(&scd_c->sc_clientid, 8);
1240         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1241
1242         DECODE_TAIL;
1243 }
1244
1245 /* Also used for NVERIFY */
1246 static __be32
1247 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1248 {
1249         DECODE_HEAD;
1250
1251         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1252                 goto out;
1253
1254         /* For convenience's sake, we compare raw xdr'd attributes in
1255          * nfsd4_proc_verify */
1256
1257         READ_BUF(4);
1258         verify->ve_attrlen = be32_to_cpup(p++);
1259         READ_BUF(verify->ve_attrlen);
1260         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1261
1262         DECODE_TAIL;
1263 }
1264
1265 static __be32
1266 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1267 {
1268         int avail;
1269         int len;
1270         DECODE_HEAD;
1271
1272         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1273         if (status)
1274                 return status;
1275         READ_BUF(16);
1276         p = xdr_decode_hyper(p, &write->wr_offset);
1277         write->wr_stable_how = be32_to_cpup(p++);
1278         if (write->wr_stable_how > NFS_FILE_SYNC)
1279                 goto xdr_error;
1280         write->wr_buflen = be32_to_cpup(p++);
1281
1282         /* Sorry .. no magic macros for this.. *
1283          * READ_BUF(write->wr_buflen);
1284          * SAVEMEM(write->wr_buf, write->wr_buflen);
1285          */
1286         avail = (char*)argp->end - (char*)argp->p;
1287         if (avail + argp->pagelen < write->wr_buflen) {
1288                 dprintk("NFSD: xdr error (%s:%d)\n",
1289                                 __FILE__, __LINE__);
1290                 goto xdr_error;
1291         }
1292         write->wr_head.iov_base = p;
1293         write->wr_head.iov_len = avail;
1294         write->wr_pagelist = argp->pagelist;
1295
1296         len = XDR_QUADLEN(write->wr_buflen) << 2;
1297         if (len >= avail) {
1298                 int pages;
1299
1300                 len -= avail;
1301
1302                 pages = len >> PAGE_SHIFT;
1303                 argp->pagelist += pages;
1304                 argp->pagelen -= pages * PAGE_SIZE;
1305                 len -= pages * PAGE_SIZE;
1306
1307                 next_decode_page(argp);
1308         }
1309         argp->p += XDR_QUADLEN(len);
1310
1311         DECODE_TAIL;
1312 }
1313
1314 static __be32
1315 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1316 {
1317         DECODE_HEAD;
1318
1319         if (argp->minorversion >= 1)
1320                 return nfserr_notsupp;
1321
1322         READ_BUF(12);
1323         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1324         rlockowner->rl_owner.len = be32_to_cpup(p++);
1325         READ_BUF(rlockowner->rl_owner.len);
1326         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1327
1328         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1329                 return nfserr_inval;
1330         DECODE_TAIL;
1331 }
1332
1333 static __be32
1334 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1335                          struct nfsd4_exchange_id *exid)
1336 {
1337         int dummy, tmp;
1338         DECODE_HEAD;
1339
1340         READ_BUF(NFS4_VERIFIER_SIZE);
1341         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1342
1343         status = nfsd4_decode_opaque(argp, &exid->clname);
1344         if (status)
1345                 return nfserr_bad_xdr;
1346
1347         READ_BUF(4);
1348         exid->flags = be32_to_cpup(p++);
1349
1350         /* Ignore state_protect4_a */
1351         READ_BUF(4);
1352         exid->spa_how = be32_to_cpup(p++);
1353         switch (exid->spa_how) {
1354         case SP4_NONE:
1355                 break;
1356         case SP4_MACH_CRED:
1357                 /* spo_must_enforce */
1358                 status = nfsd4_decode_bitmap(argp,
1359                                         exid->spo_must_enforce);
1360                 if (status)
1361                         goto out;
1362                 /* spo_must_allow */
1363                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1364                 if (status)
1365                         goto out;
1366                 break;
1367         case SP4_SSV:
1368                 /* ssp_ops */
1369                 READ_BUF(4);
1370                 dummy = be32_to_cpup(p++);
1371                 READ_BUF(dummy * 4);
1372                 p += dummy;
1373
1374                 READ_BUF(4);
1375                 dummy = be32_to_cpup(p++);
1376                 READ_BUF(dummy * 4);
1377                 p += dummy;
1378
1379                 /* ssp_hash_algs<> */
1380                 READ_BUF(4);
1381                 tmp = be32_to_cpup(p++);
1382                 while (tmp--) {
1383                         READ_BUF(4);
1384                         dummy = be32_to_cpup(p++);
1385                         READ_BUF(dummy);
1386                         p += XDR_QUADLEN(dummy);
1387                 }
1388
1389                 /* ssp_encr_algs<> */
1390                 READ_BUF(4);
1391                 tmp = be32_to_cpup(p++);
1392                 while (tmp--) {
1393                         READ_BUF(4);
1394                         dummy = be32_to_cpup(p++);
1395                         READ_BUF(dummy);
1396                         p += XDR_QUADLEN(dummy);
1397                 }
1398
1399                 /* ignore ssp_window and ssp_num_gss_handles: */
1400                 READ_BUF(8);
1401                 break;
1402         default:
1403                 goto xdr_error;
1404         }
1405
1406         READ_BUF(4);    /* nfs_impl_id4 array length */
1407         dummy = be32_to_cpup(p++);
1408
1409         if (dummy > 1)
1410                 goto xdr_error;
1411
1412         if (dummy == 1) {
1413                 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1414                 if (status)
1415                         goto xdr_error;
1416
1417                 /* nii_name */
1418                 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1419                 if (status)
1420                         goto xdr_error;
1421
1422                 /* nii_date */
1423                 status = nfsd4_decode_time(argp, &exid->nii_time);
1424                 if (status)
1425                         goto xdr_error;
1426         }
1427         DECODE_TAIL;
1428 }
1429
1430 static __be32
1431 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1432                             struct nfsd4_create_session *sess)
1433 {
1434         DECODE_HEAD;
1435
1436         READ_BUF(16);
1437         COPYMEM(&sess->clientid, 8);
1438         sess->seqid = be32_to_cpup(p++);
1439         sess->flags = be32_to_cpup(p++);
1440
1441         /* Fore channel attrs */
1442         READ_BUF(28);
1443         p++; /* headerpadsz is always 0 */
1444         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1445         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1446         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1447         sess->fore_channel.maxops = be32_to_cpup(p++);
1448         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1449         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1450         if (sess->fore_channel.nr_rdma_attrs == 1) {
1451                 READ_BUF(4);
1452                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1453         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1454                 dprintk("Too many fore channel attr bitmaps!\n");
1455                 goto xdr_error;
1456         }
1457
1458         /* Back channel attrs */
1459         READ_BUF(28);
1460         p++; /* headerpadsz is always 0 */
1461         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1462         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1463         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1464         sess->back_channel.maxops = be32_to_cpup(p++);
1465         sess->back_channel.maxreqs = be32_to_cpup(p++);
1466         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1467         if (sess->back_channel.nr_rdma_attrs == 1) {
1468                 READ_BUF(4);
1469                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1470         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1471                 dprintk("Too many back channel attr bitmaps!\n");
1472                 goto xdr_error;
1473         }
1474
1475         READ_BUF(4);
1476         sess->callback_prog = be32_to_cpup(p++);
1477         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1478         DECODE_TAIL;
1479 }
1480
1481 static __be32
1482 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1483                              struct nfsd4_destroy_session *destroy_session)
1484 {
1485         DECODE_HEAD;
1486         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1487         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1488
1489         DECODE_TAIL;
1490 }
1491
1492 static __be32
1493 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1494                           struct nfsd4_free_stateid *free_stateid)
1495 {
1496         DECODE_HEAD;
1497
1498         READ_BUF(sizeof(stateid_t));
1499         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1500         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1501
1502         DECODE_TAIL;
1503 }
1504
1505 static __be32
1506 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1507                       struct nfsd4_sequence *seq)
1508 {
1509         DECODE_HEAD;
1510
1511         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1512         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1513         seq->seqid = be32_to_cpup(p++);
1514         seq->slotid = be32_to_cpup(p++);
1515         seq->maxslots = be32_to_cpup(p++);
1516         seq->cachethis = be32_to_cpup(p++);
1517
1518         DECODE_TAIL;
1519 }
1520
1521 static __be32
1522 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1523 {
1524         int i;
1525         __be32 *p, status;
1526         struct nfsd4_test_stateid_id *stateid;
1527
1528         READ_BUF(4);
1529         test_stateid->ts_num_ids = ntohl(*p++);
1530
1531         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1532
1533         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1534                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1535                 if (!stateid) {
1536                         status = nfserrno(-ENOMEM);
1537                         goto out;
1538                 }
1539
1540                 INIT_LIST_HEAD(&stateid->ts_id_list);
1541                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1542
1543                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1544                 if (status)
1545                         goto out;
1546         }
1547
1548         status = 0;
1549 out:
1550         return status;
1551 xdr_error:
1552         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1553         status = nfserr_bad_xdr;
1554         goto out;
1555 }
1556
1557 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1558 {
1559         DECODE_HEAD;
1560
1561         READ_BUF(8);
1562         COPYMEM(&dc->clientid, 8);
1563
1564         DECODE_TAIL;
1565 }
1566
1567 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1568 {
1569         DECODE_HEAD;
1570
1571         READ_BUF(4);
1572         rc->rca_one_fs = be32_to_cpup(p++);
1573
1574         DECODE_TAIL;
1575 }
1576
1577 #ifdef CONFIG_NFSD_PNFS
1578 static __be32
1579 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1580                 struct nfsd4_getdeviceinfo *gdev)
1581 {
1582         DECODE_HEAD;
1583         u32 num, i;
1584
1585         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1586         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1587         gdev->gd_layout_type = be32_to_cpup(p++);
1588         gdev->gd_maxcount = be32_to_cpup(p++);
1589         num = be32_to_cpup(p++);
1590         if (num) {
1591                 if (num > 1000)
1592                         goto xdr_error;
1593                 READ_BUF(4 * num);
1594                 gdev->gd_notify_types = be32_to_cpup(p++);
1595                 for (i = 1; i < num; i++) {
1596                         if (be32_to_cpup(p++)) {
1597                                 status = nfserr_inval;
1598                                 goto out;
1599                         }
1600                 }
1601         }
1602         DECODE_TAIL;
1603 }
1604
1605 static __be32
1606 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1607                 struct nfsd4_layoutget *lgp)
1608 {
1609         DECODE_HEAD;
1610
1611         READ_BUF(36);
1612         lgp->lg_signal = be32_to_cpup(p++);
1613         lgp->lg_layout_type = be32_to_cpup(p++);
1614         lgp->lg_seg.iomode = be32_to_cpup(p++);
1615         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1616         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1617         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1618
1619         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1620         if (status)
1621                 return status;
1622
1623         READ_BUF(4);
1624         lgp->lg_maxcount = be32_to_cpup(p++);
1625
1626         DECODE_TAIL;
1627 }
1628
1629 static __be32
1630 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1631                 struct nfsd4_layoutcommit *lcp)
1632 {
1633         DECODE_HEAD;
1634         u32 timechange;
1635
1636         READ_BUF(20);
1637         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1638         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1639         lcp->lc_reclaim = be32_to_cpup(p++);
1640
1641         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1642         if (status)
1643                 return status;
1644
1645         READ_BUF(4);
1646         lcp->lc_newoffset = be32_to_cpup(p++);
1647         if (lcp->lc_newoffset) {
1648                 READ_BUF(8);
1649                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1650         } else
1651                 lcp->lc_last_wr = 0;
1652         READ_BUF(4);
1653         timechange = be32_to_cpup(p++);
1654         if (timechange) {
1655                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1656                 if (status)
1657                         return status;
1658         } else {
1659                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1660         }
1661         READ_BUF(8);
1662         lcp->lc_layout_type = be32_to_cpup(p++);
1663
1664         /*
1665          * Save the layout update in XDR format and let the layout driver deal
1666          * with it later.
1667          */
1668         lcp->lc_up_len = be32_to_cpup(p++);
1669         if (lcp->lc_up_len > 0) {
1670                 READ_BUF(lcp->lc_up_len);
1671                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1672         }
1673
1674         DECODE_TAIL;
1675 }
1676
1677 static __be32
1678 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1679                 struct nfsd4_layoutreturn *lrp)
1680 {
1681         DECODE_HEAD;
1682
1683         READ_BUF(16);
1684         lrp->lr_reclaim = be32_to_cpup(p++);
1685         lrp->lr_layout_type = be32_to_cpup(p++);
1686         lrp->lr_seg.iomode = be32_to_cpup(p++);
1687         lrp->lr_return_type = be32_to_cpup(p++);
1688         if (lrp->lr_return_type == RETURN_FILE) {
1689                 READ_BUF(16);
1690                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1691                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1692
1693                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1694                 if (status)
1695                         return status;
1696
1697                 READ_BUF(4);
1698                 lrp->lrf_body_len = be32_to_cpup(p++);
1699                 if (lrp->lrf_body_len > 0) {
1700                         READ_BUF(lrp->lrf_body_len);
1701                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1702                 }
1703         } else {
1704                 lrp->lr_seg.offset = 0;
1705                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1706         }
1707
1708         DECODE_TAIL;
1709 }
1710 #endif /* CONFIG_NFSD_PNFS */
1711
1712 static __be32
1713 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1714                        struct nfsd4_fallocate *fallocate)
1715 {
1716         DECODE_HEAD;
1717
1718         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1719         if (status)
1720                 return status;
1721
1722         READ_BUF(16);
1723         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1724         xdr_decode_hyper(p, &fallocate->falloc_length);
1725
1726         DECODE_TAIL;
1727 }
1728
1729 static __be32
1730 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1731 {
1732         DECODE_HEAD;
1733
1734         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1735         if (status)
1736                 return status;
1737         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1738         if (status)
1739                 return status;
1740
1741         READ_BUF(8 + 8 + 8);
1742         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1743         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1744         p = xdr_decode_hyper(p, &clone->cl_count);
1745         DECODE_TAIL;
1746 }
1747
1748 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1749                                       struct nl4_server *ns)
1750 {
1751         DECODE_HEAD;
1752         struct nfs42_netaddr *naddr;
1753
1754         READ_BUF(4);
1755         ns->nl4_type = be32_to_cpup(p++);
1756
1757         /* currently support for 1 inter-server source server */
1758         switch (ns->nl4_type) {
1759         case NL4_NETADDR:
1760                 naddr = &ns->u.nl4_addr;
1761
1762                 READ_BUF(4);
1763                 naddr->netid_len = be32_to_cpup(p++);
1764                 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1765                         goto xdr_error;
1766
1767                 READ_BUF(naddr->netid_len + 4); /* 4 for uaddr len */
1768                 COPYMEM(naddr->netid, naddr->netid_len);
1769
1770                 naddr->addr_len = be32_to_cpup(p++);
1771                 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1772                         goto xdr_error;
1773
1774                 READ_BUF(naddr->addr_len);
1775                 COPYMEM(naddr->addr, naddr->addr_len);
1776                 break;
1777         default:
1778                 goto xdr_error;
1779         }
1780         DECODE_TAIL;
1781 }
1782
1783 static __be32
1784 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1785 {
1786         DECODE_HEAD;
1787         struct nl4_server *ns_dummy;
1788         int i, count;
1789
1790         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1791         if (status)
1792                 return status;
1793         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1794         if (status)
1795                 return status;
1796
1797         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1798         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1799         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1800         p = xdr_decode_hyper(p, &copy->cp_count);
1801         p++; /* ca_consecutive: we always do consecutive copies */
1802         copy->cp_synchronous = be32_to_cpup(p++);
1803
1804         count = be32_to_cpup(p++);
1805
1806         copy->cp_intra = false;
1807         if (count == 0) { /* intra-server copy */
1808                 copy->cp_intra = true;
1809                 goto intra;
1810         }
1811
1812         /* decode all the supplied server addresses but use first */
1813         status = nfsd4_decode_nl4_server(argp, &copy->cp_src);
1814         if (status)
1815                 return status;
1816
1817         ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
1818         if (ns_dummy == NULL)
1819                 return nfserrno(-ENOMEM);
1820         for (i = 0; i < count - 1; i++) {
1821                 status = nfsd4_decode_nl4_server(argp, ns_dummy);
1822                 if (status) {
1823                         kfree(ns_dummy);
1824                         return status;
1825                 }
1826         }
1827         kfree(ns_dummy);
1828 intra:
1829
1830         DECODE_TAIL;
1831 }
1832
1833 static __be32
1834 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
1835                             struct nfsd4_offload_status *os)
1836 {
1837         return nfsd4_decode_stateid(argp, &os->stateid);
1838 }
1839
1840 static __be32
1841 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
1842                          struct nfsd4_copy_notify *cn)
1843 {
1844         int status;
1845
1846         status = nfsd4_decode_stateid(argp, &cn->cpn_src_stateid);
1847         if (status)
1848                 return status;
1849         return nfsd4_decode_nl4_server(argp, &cn->cpn_dst);
1850 }
1851
1852 static __be32
1853 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1854 {
1855         DECODE_HEAD;
1856
1857         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1858         if (status)
1859                 return status;
1860
1861         READ_BUF(8 + 4);
1862         p = xdr_decode_hyper(p, &seek->seek_offset);
1863         seek->seek_whence = be32_to_cpup(p);
1864
1865         DECODE_TAIL;
1866 }
1867
1868 static __be32
1869 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1870 {
1871         return nfs_ok;
1872 }
1873
1874 static __be32
1875 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1876 {
1877         return nfserr_notsupp;
1878 }
1879
1880 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1881
1882 static const nfsd4_dec nfsd4_dec_ops[] = {
1883         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1884         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1885         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1886         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1887         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1888         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1889         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1890         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1891         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1892         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1893         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1894         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1895         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1896         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1897         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1898         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1899         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1900         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1901         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1902         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1903         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1904         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1905         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1906         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1907         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1908         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1909         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1910         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1911         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1912         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1913         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1914         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1915         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1916         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1917         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1918         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1919         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1920
1921         /* new operations for NFSv4.1 */
1922         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1923         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1924         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1925         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1926         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1927         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1928         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1929 #ifdef CONFIG_NFSD_PNFS
1930         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1931         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1932         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1933         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1934         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1935 #else
1936         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1937         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1938         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1939         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1940         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1941 #endif
1942         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1943         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1944         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1945         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1946         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1947         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1948         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1949
1950         /* new operations for NFSv4.2 */
1951         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1952         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1953         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_copy_notify,
1954         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1955         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1956         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1957         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1958         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_offload_status,
1959         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_offload_status,
1960         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1961         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1962         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1963         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1964 };
1965
1966 static inline bool
1967 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1968 {
1969         if (op->opnum < FIRST_NFS4_OP)
1970                 return false;
1971         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1972                 return false;
1973         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1974                 return false;
1975         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1976                 return false;
1977         return true;
1978 }
1979
1980 static __be32
1981 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1982 {
1983         DECODE_HEAD;
1984         struct nfsd4_op *op;
1985         bool cachethis = false;
1986         int auth_slack= argp->rqstp->rq_auth_slack;
1987         int max_reply = auth_slack + 8; /* opcnt, status */
1988         int readcount = 0;
1989         int readbytes = 0;
1990         int i;
1991
1992         READ_BUF(4);
1993         argp->taglen = be32_to_cpup(p++);
1994         READ_BUF(argp->taglen);
1995         SAVEMEM(argp->tag, argp->taglen);
1996         READ_BUF(8);
1997         argp->minorversion = be32_to_cpup(p++);
1998         argp->opcnt = be32_to_cpup(p++);
1999         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
2000
2001         if (argp->taglen > NFSD4_MAX_TAGLEN)
2002                 goto xdr_error;
2003         /*
2004          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
2005          * here, so we return success at the xdr level so that
2006          * nfsd4_proc can handle this is an NFS-level error.
2007          */
2008         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2009                 return 0;
2010
2011         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2012                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
2013                 if (!argp->ops) {
2014                         argp->ops = argp->iops;
2015                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
2016                         goto xdr_error;
2017                 }
2018         }
2019
2020         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2021                 argp->opcnt = 0;
2022
2023         for (i = 0; i < argp->opcnt; i++) {
2024                 op = &argp->ops[i];
2025                 op->replay = NULL;
2026
2027                 READ_BUF(4);
2028                 op->opnum = be32_to_cpup(p++);
2029
2030                 if (nfsd4_opnum_in_range(argp, op))
2031                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2032                 else {
2033                         op->opnum = OP_ILLEGAL;
2034                         op->status = nfserr_op_illegal;
2035                 }
2036                 op->opdesc = OPDESC(op);
2037                 /*
2038                  * We'll try to cache the result in the DRC if any one
2039                  * op in the compound wants to be cached:
2040                  */
2041                 cachethis |= nfsd4_cache_this_op(op);
2042
2043                 if (op->opnum == OP_READ) {
2044                         readcount++;
2045                         readbytes += nfsd4_max_reply(argp->rqstp, op);
2046                 } else
2047                         max_reply += nfsd4_max_reply(argp->rqstp, op);
2048                 /*
2049                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
2050                  * (Special case because it will just skip encoding this
2051                  * if it runs out of xdr buffer space, and it is the only
2052                  * operation that behaves this way.)
2053                  */
2054                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2055                         max_reply += NFS4_OPAQUE_LIMIT;
2056
2057                 if (op->status) {
2058                         argp->opcnt = i+1;
2059                         break;
2060                 }
2061         }
2062         /* Sessions make the DRC unnecessary: */
2063         if (argp->minorversion)
2064                 cachethis = false;
2065         svc_reserve(argp->rqstp, max_reply + readbytes);
2066         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2067
2068         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2069                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2070
2071         DECODE_TAIL;
2072 }
2073
2074 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2075                              struct svc_export *exp)
2076 {
2077         if (exp->ex_flags & NFSEXP_V4ROOT) {
2078                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2079                 *p++ = 0;
2080         } else if (IS_I_VERSION(inode)) {
2081                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2082         } else {
2083                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2084                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2085         }
2086         return p;
2087 }
2088
2089 /*
2090  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2091  * doesn't really care what resolution could theoretically be stored by
2092  * the filesystem.
2093  *
2094  * The client cares how close together changes can be while still
2095  * guaranteeing ctime changes.  For most filesystems (which have
2096  * timestamps with nanosecond fields) that is limited by the resolution
2097  * of the time returned from current_time() (which I'm assuming to be
2098  * 1/HZ).
2099  */
2100 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2101 {
2102         struct timespec64 ts;
2103         u32 ns;
2104
2105         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2106         ts = ns_to_timespec64(ns);
2107
2108         p = xdr_encode_hyper(p, ts.tv_sec);
2109         *p++ = cpu_to_be32(ts.tv_nsec);
2110
2111         return p;
2112 }
2113
2114 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2115 {
2116         *p++ = cpu_to_be32(c->atomic);
2117         if (c->change_supported) {
2118                 p = xdr_encode_hyper(p, c->before_change);
2119                 p = xdr_encode_hyper(p, c->after_change);
2120         } else {
2121                 *p++ = cpu_to_be32(c->before_ctime_sec);
2122                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2123                 *p++ = cpu_to_be32(c->after_ctime_sec);
2124                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2125         }
2126         return p;
2127 }
2128
2129 /* Encode as an array of strings the string given with components
2130  * separated @sep, escaped with esc_enter and esc_exit.
2131  */
2132 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2133                                           char *components, char esc_enter,
2134                                           char esc_exit)
2135 {
2136         __be32 *p;
2137         __be32 pathlen;
2138         int pathlen_offset;
2139         int strlen, count=0;
2140         char *str, *end, *next;
2141
2142         dprintk("nfsd4_encode_components(%s)\n", components);
2143
2144         pathlen_offset = xdr->buf->len;
2145         p = xdr_reserve_space(xdr, 4);
2146         if (!p)
2147                 return nfserr_resource;
2148         p++; /* We will fill this in with @count later */
2149
2150         end = str = components;
2151         while (*end) {
2152                 bool found_esc = false;
2153
2154                 /* try to parse as esc_start, ..., esc_end, sep */
2155                 if (*str == esc_enter) {
2156                         for (; *end && (*end != esc_exit); end++)
2157                                 /* find esc_exit or end of string */;
2158                         next = end + 1;
2159                         if (*end && (!*next || *next == sep)) {
2160                                 str++;
2161                                 found_esc = true;
2162                         }
2163                 }
2164
2165                 if (!found_esc)
2166                         for (; *end && (*end != sep); end++)
2167                                 /* find sep or end of string */;
2168
2169                 strlen = end - str;
2170                 if (strlen) {
2171                         p = xdr_reserve_space(xdr, strlen + 4);
2172                         if (!p)
2173                                 return nfserr_resource;
2174                         p = xdr_encode_opaque(p, str, strlen);
2175                         count++;
2176                 }
2177                 else
2178                         end++;
2179                 if (found_esc)
2180                         end = next;
2181
2182                 str = end;
2183         }
2184         pathlen = htonl(count);
2185         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2186         return 0;
2187 }
2188
2189 /* Encode as an array of strings the string given with components
2190  * separated @sep.
2191  */
2192 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2193                                       char *components)
2194 {
2195         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2196 }
2197
2198 /*
2199  * encode a location element of a fs_locations structure
2200  */
2201 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2202                                         struct nfsd4_fs_location *location)
2203 {
2204         __be32 status;
2205
2206         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2207                                                 '[', ']');
2208         if (status)
2209                 return status;
2210         status = nfsd4_encode_components(xdr, '/', location->path);
2211         if (status)
2212                 return status;
2213         return 0;
2214 }
2215
2216 /*
2217  * Encode a path in RFC3530 'pathname4' format
2218  */
2219 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2220                                 const struct path *root,
2221                                 const struct path *path)
2222 {
2223         struct path cur = *path;
2224         __be32 *p;
2225         struct dentry **components = NULL;
2226         unsigned int ncomponents = 0;
2227         __be32 err = nfserr_jukebox;
2228
2229         dprintk("nfsd4_encode_components(");
2230
2231         path_get(&cur);
2232         /* First walk the path up to the nfsd root, and store the
2233          * dentries/path components in an array.
2234          */
2235         for (;;) {
2236                 if (path_equal(&cur, root))
2237                         break;
2238                 if (cur.dentry == cur.mnt->mnt_root) {
2239                         if (follow_up(&cur))
2240                                 continue;
2241                         goto out_free;
2242                 }
2243                 if ((ncomponents & 15) == 0) {
2244                         struct dentry **new;
2245                         new = krealloc(components,
2246                                         sizeof(*new) * (ncomponents + 16),
2247                                         GFP_KERNEL);
2248                         if (!new)
2249                                 goto out_free;
2250                         components = new;
2251                 }
2252                 components[ncomponents++] = cur.dentry;
2253                 cur.dentry = dget_parent(cur.dentry);
2254         }
2255         err = nfserr_resource;
2256         p = xdr_reserve_space(xdr, 4);
2257         if (!p)
2258                 goto out_free;
2259         *p++ = cpu_to_be32(ncomponents);
2260
2261         while (ncomponents) {
2262                 struct dentry *dentry = components[ncomponents - 1];
2263                 unsigned int len;
2264
2265                 spin_lock(&dentry->d_lock);
2266                 len = dentry->d_name.len;
2267                 p = xdr_reserve_space(xdr, len + 4);
2268                 if (!p) {
2269                         spin_unlock(&dentry->d_lock);
2270                         goto out_free;
2271                 }
2272                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2273                 dprintk("/%pd", dentry);
2274                 spin_unlock(&dentry->d_lock);
2275                 dput(dentry);
2276                 ncomponents--;
2277         }
2278
2279         err = 0;
2280 out_free:
2281         dprintk(")\n");
2282         while (ncomponents)
2283                 dput(components[--ncomponents]);
2284         kfree(components);
2285         path_put(&cur);
2286         return err;
2287 }
2288
2289 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2290                         struct svc_rqst *rqstp, const struct path *path)
2291 {
2292         struct svc_export *exp_ps;
2293         __be32 res;
2294
2295         exp_ps = rqst_find_fsidzero_export(rqstp);
2296         if (IS_ERR(exp_ps))
2297                 return nfserrno(PTR_ERR(exp_ps));
2298         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2299         exp_put(exp_ps);
2300         return res;
2301 }
2302
2303 /*
2304  *  encode a fs_locations structure
2305  */
2306 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2307                         struct svc_rqst *rqstp, struct svc_export *exp)
2308 {
2309         __be32 status;
2310         int i;
2311         __be32 *p;
2312         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2313
2314         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2315         if (status)
2316                 return status;
2317         p = xdr_reserve_space(xdr, 4);
2318         if (!p)
2319                 return nfserr_resource;
2320         *p++ = cpu_to_be32(fslocs->locations_count);
2321         for (i=0; i<fslocs->locations_count; i++) {
2322                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2323                 if (status)
2324                         return status;
2325         }
2326         return 0;
2327 }
2328
2329 static u32 nfs4_file_type(umode_t mode)
2330 {
2331         switch (mode & S_IFMT) {
2332         case S_IFIFO:   return NF4FIFO;
2333         case S_IFCHR:   return NF4CHR;
2334         case S_IFDIR:   return NF4DIR;
2335         case S_IFBLK:   return NF4BLK;
2336         case S_IFLNK:   return NF4LNK;
2337         case S_IFREG:   return NF4REG;
2338         case S_IFSOCK:  return NF4SOCK;
2339         default:        return NF4BAD;
2340         };
2341 }
2342
2343 static inline __be32
2344 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2345                      struct nfs4_ace *ace)
2346 {
2347         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2348                 return nfs4_acl_write_who(xdr, ace->whotype);
2349         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2350                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2351         else
2352                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2353 }
2354
2355 static inline __be32
2356 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2357 {
2358         __be32          *p;
2359         unsigned long   i = hweight_long(layout_types);
2360
2361         p = xdr_reserve_space(xdr, 4 + 4 * i);
2362         if (!p)
2363                 return nfserr_resource;
2364
2365         *p++ = cpu_to_be32(i);
2366
2367         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2368                 if (layout_types & (1 << i))
2369                         *p++ = cpu_to_be32(i);
2370
2371         return 0;
2372 }
2373
2374 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2375                               FATTR4_WORD0_RDATTR_ERROR)
2376 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2377 #define WORD2_ABSENT_FS_ATTRS 0
2378
2379 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2380 static inline __be32
2381 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2382                             void *context, int len)
2383 {
2384         __be32 *p;
2385
2386         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2387         if (!p)
2388                 return nfserr_resource;
2389
2390         /*
2391          * For now we use a 0 here to indicate the null translation; in
2392          * the future we may place a call to translation code here.
2393          */
2394         *p++ = cpu_to_be32(0); /* lfs */
2395         *p++ = cpu_to_be32(0); /* pi */
2396         p = xdr_encode_opaque(p, context, len);
2397         return 0;
2398 }
2399 #else
2400 static inline __be32
2401 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2402                             void *context, int len)
2403 { return 0; }
2404 #endif
2405
2406 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2407 {
2408         /* As per referral draft:  */
2409         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2410             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2411                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2412                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2413                         *rdattr_err = NFSERR_MOVED;
2414                 else
2415                         return nfserr_moved;
2416         }
2417         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2418         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2419         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2420         return 0;
2421 }
2422
2423
2424 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2425 {
2426         struct path path = exp->ex_path;
2427         int err;
2428
2429         path_get(&path);
2430         while (follow_up(&path)) {
2431                 if (path.dentry != path.mnt->mnt_root)
2432                         break;
2433         }
2434         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2435         path_put(&path);
2436         return err;
2437 }
2438
2439 static __be32
2440 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2441 {
2442         __be32 *p;
2443
2444         if (bmval2) {
2445                 p = xdr_reserve_space(xdr, 16);
2446                 if (!p)
2447                         goto out_resource;
2448                 *p++ = cpu_to_be32(3);
2449                 *p++ = cpu_to_be32(bmval0);
2450                 *p++ = cpu_to_be32(bmval1);
2451                 *p++ = cpu_to_be32(bmval2);
2452         } else if (bmval1) {
2453                 p = xdr_reserve_space(xdr, 12);
2454                 if (!p)
2455                         goto out_resource;
2456                 *p++ = cpu_to_be32(2);
2457                 *p++ = cpu_to_be32(bmval0);
2458                 *p++ = cpu_to_be32(bmval1);
2459         } else {
2460                 p = xdr_reserve_space(xdr, 8);
2461                 if (!p)
2462                         goto out_resource;
2463                 *p++ = cpu_to_be32(1);
2464                 *p++ = cpu_to_be32(bmval0);
2465         }
2466
2467         return 0;
2468 out_resource:
2469         return nfserr_resource;
2470 }
2471
2472 /*
2473  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2474  * ourselves.
2475  */
2476 static __be32
2477 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2478                 struct svc_export *exp,
2479                 struct dentry *dentry, u32 *bmval,
2480                 struct svc_rqst *rqstp, int ignore_crossmnt)
2481 {
2482         u32 bmval0 = bmval[0];
2483         u32 bmval1 = bmval[1];
2484         u32 bmval2 = bmval[2];
2485         struct kstat stat;
2486         struct svc_fh *tempfh = NULL;
2487         struct kstatfs statfs;
2488         __be32 *p;
2489         int starting_len = xdr->buf->len;
2490         int attrlen_offset;
2491         __be32 attrlen;
2492         u32 dummy;
2493         u64 dummy64;
2494         u32 rdattr_err = 0;
2495         __be32 status;
2496         int err;
2497         struct nfs4_acl *acl = NULL;
2498 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2499         void *context = NULL;
2500         int contextlen;
2501 #endif
2502         bool contextsupport = false;
2503         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2504         u32 minorversion = resp->cstate.minorversion;
2505         struct path path = {
2506                 .mnt    = exp->ex_path.mnt,
2507                 .dentry = dentry,
2508         };
2509         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2510
2511         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2512         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2513
2514         if (exp->ex_fslocs.migrated) {
2515                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2516                 if (status)
2517                         goto out;
2518         }
2519
2520         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2521         if (err)
2522                 goto out_nfserr;
2523         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2524                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2525             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2526                        FATTR4_WORD1_SPACE_TOTAL))) {
2527                 err = vfs_statfs(&path, &statfs);
2528                 if (err)
2529                         goto out_nfserr;
2530         }
2531         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2532                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2533                 status = nfserr_jukebox;
2534                 if (!tempfh)
2535                         goto out;
2536                 fh_init(tempfh, NFS4_FHSIZE);
2537                 status = fh_compose(tempfh, exp, dentry, NULL);
2538                 if (status)
2539                         goto out;
2540                 fhp = tempfh;
2541         }
2542         if (bmval0 & FATTR4_WORD0_ACL) {
2543                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2544                 if (err == -EOPNOTSUPP)
2545                         bmval0 &= ~FATTR4_WORD0_ACL;
2546                 else if (err == -EINVAL) {
2547                         status = nfserr_attrnotsupp;
2548                         goto out;
2549                 } else if (err != 0)
2550                         goto out_nfserr;
2551         }
2552
2553 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2554         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2555              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2556                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2557                         err = security_inode_getsecctx(d_inode(dentry),
2558                                                 &context, &contextlen);
2559                 else
2560                         err = -EOPNOTSUPP;
2561                 contextsupport = (err == 0);
2562                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2563                         if (err == -EOPNOTSUPP)
2564                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2565                         else if (err)
2566                                 goto out_nfserr;
2567                 }
2568         }
2569 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2570
2571         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2572         if (status)
2573                 goto out;
2574
2575         attrlen_offset = xdr->buf->len;
2576         p = xdr_reserve_space(xdr, 4);
2577         if (!p)
2578                 goto out_resource;
2579         p++;                /* to be backfilled later */
2580
2581         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2582                 u32 supp[3];
2583
2584                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2585
2586                 if (!IS_POSIXACL(dentry->d_inode))
2587                         supp[0] &= ~FATTR4_WORD0_ACL;
2588                 if (!contextsupport)
2589                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2590                 if (!supp[2]) {
2591                         p = xdr_reserve_space(xdr, 12);
2592                         if (!p)
2593                                 goto out_resource;
2594                         *p++ = cpu_to_be32(2);
2595                         *p++ = cpu_to_be32(supp[0]);
2596                         *p++ = cpu_to_be32(supp[1]);
2597                 } else {
2598                         p = xdr_reserve_space(xdr, 16);
2599                         if (!p)
2600                                 goto out_resource;
2601                         *p++ = cpu_to_be32(3);
2602                         *p++ = cpu_to_be32(supp[0]);
2603                         *p++ = cpu_to_be32(supp[1]);
2604                         *p++ = cpu_to_be32(supp[2]);
2605                 }
2606         }
2607         if (bmval0 & FATTR4_WORD0_TYPE) {
2608                 p = xdr_reserve_space(xdr, 4);
2609                 if (!p)
2610                         goto out_resource;
2611                 dummy = nfs4_file_type(stat.mode);
2612                 if (dummy == NF4BAD) {
2613                         status = nfserr_serverfault;
2614                         goto out;
2615                 }
2616                 *p++ = cpu_to_be32(dummy);
2617         }
2618         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2619                 p = xdr_reserve_space(xdr, 4);
2620                 if (!p)
2621                         goto out_resource;
2622                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2623                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2624                 else
2625                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2626                                                 NFS4_FH_VOL_RENAME);
2627         }
2628         if (bmval0 & FATTR4_WORD0_CHANGE) {
2629                 p = xdr_reserve_space(xdr, 8);
2630                 if (!p)
2631                         goto out_resource;
2632                 p = encode_change(p, &stat, d_inode(dentry), exp);
2633         }
2634         if (bmval0 & FATTR4_WORD0_SIZE) {
2635                 p = xdr_reserve_space(xdr, 8);
2636                 if (!p)
2637                         goto out_resource;
2638                 p = xdr_encode_hyper(p, stat.size);
2639         }
2640         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2641                 p = xdr_reserve_space(xdr, 4);
2642                 if (!p)
2643                         goto out_resource;
2644                 *p++ = cpu_to_be32(1);
2645         }
2646         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2647                 p = xdr_reserve_space(xdr, 4);
2648                 if (!p)
2649                         goto out_resource;
2650                 *p++ = cpu_to_be32(1);
2651         }
2652         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2653                 p = xdr_reserve_space(xdr, 4);
2654                 if (!p)
2655                         goto out_resource;
2656                 *p++ = cpu_to_be32(0);
2657         }
2658         if (bmval0 & FATTR4_WORD0_FSID) {
2659                 p = xdr_reserve_space(xdr, 16);
2660                 if (!p)
2661                         goto out_resource;
2662                 if (exp->ex_fslocs.migrated) {
2663                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2664                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2665                 } else switch(fsid_source(fhp)) {
2666                 case FSIDSOURCE_FSID:
2667                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2668                         p = xdr_encode_hyper(p, (u64)0);
2669                         break;
2670                 case FSIDSOURCE_DEV:
2671                         *p++ = cpu_to_be32(0);
2672                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2673                         *p++ = cpu_to_be32(0);
2674                         *p++ = cpu_to_be32(MINOR(stat.dev));
2675                         break;
2676                 case FSIDSOURCE_UUID:
2677                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2678                                                                 EX_UUID_LEN);
2679                         break;
2680                 }
2681         }
2682         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2683                 p = xdr_reserve_space(xdr, 4);
2684                 if (!p)
2685                         goto out_resource;
2686                 *p++ = cpu_to_be32(0);
2687         }
2688         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2689                 p = xdr_reserve_space(xdr, 4);
2690                 if (!p)
2691                         goto out_resource;
2692                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2693         }
2694         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2695                 p = xdr_reserve_space(xdr, 4);
2696                 if (!p)
2697                         goto out_resource;
2698                 *p++ = cpu_to_be32(rdattr_err);
2699         }
2700         if (bmval0 & FATTR4_WORD0_ACL) {
2701                 struct nfs4_ace *ace;
2702
2703                 if (acl == NULL) {
2704                         p = xdr_reserve_space(xdr, 4);
2705                         if (!p)
2706                                 goto out_resource;
2707
2708                         *p++ = cpu_to_be32(0);
2709                         goto out_acl;
2710                 }
2711                 p = xdr_reserve_space(xdr, 4);
2712                 if (!p)
2713                         goto out_resource;
2714                 *p++ = cpu_to_be32(acl->naces);
2715
2716                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2717                         p = xdr_reserve_space(xdr, 4*3);
2718                         if (!p)
2719                                 goto out_resource;
2720                         *p++ = cpu_to_be32(ace->type);
2721                         *p++ = cpu_to_be32(ace->flag);
2722                         *p++ = cpu_to_be32(ace->access_mask &
2723                                                         NFS4_ACE_MASK_ALL);
2724                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2725                         if (status)
2726                                 goto out;
2727                 }
2728         }
2729 out_acl:
2730         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2731                 p = xdr_reserve_space(xdr, 4);
2732                 if (!p)
2733                         goto out_resource;
2734                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2735                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2736         }
2737         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2738                 p = xdr_reserve_space(xdr, 4);
2739                 if (!p)
2740                         goto out_resource;
2741                 *p++ = cpu_to_be32(1);
2742         }
2743         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2744                 p = xdr_reserve_space(xdr, 4);
2745                 if (!p)
2746                         goto out_resource;
2747                 *p++ = cpu_to_be32(0);
2748         }
2749         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2750                 p = xdr_reserve_space(xdr, 4);
2751                 if (!p)
2752                         goto out_resource;
2753                 *p++ = cpu_to_be32(1);
2754         }
2755         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2756                 p = xdr_reserve_space(xdr, 4);
2757                 if (!p)
2758                         goto out_resource;
2759                 *p++ = cpu_to_be32(1);
2760         }
2761         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2762                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2763                 if (!p)
2764                         goto out_resource;
2765                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2766                                         fhp->fh_handle.fh_size);
2767         }
2768         if (bmval0 & FATTR4_WORD0_FILEID) {
2769                 p = xdr_reserve_space(xdr, 8);
2770                 if (!p)
2771                         goto out_resource;
2772                 p = xdr_encode_hyper(p, stat.ino);
2773         }
2774         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2775                 p = xdr_reserve_space(xdr, 8);
2776                 if (!p)
2777                         goto out_resource;
2778                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2779         }
2780         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2781                 p = xdr_reserve_space(xdr, 8);
2782                 if (!p)
2783                         goto out_resource;
2784                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2785         }
2786         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2787                 p = xdr_reserve_space(xdr, 8);
2788                 if (!p)
2789                         goto out_resource;
2790                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2791         }
2792         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2793                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2794                 if (status)
2795                         goto out;
2796         }
2797         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2798                 p = xdr_reserve_space(xdr, 4);
2799                 if (!p)
2800                         goto out_resource;
2801                 *p++ = cpu_to_be32(1);
2802         }
2803         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2804                 p = xdr_reserve_space(xdr, 8);
2805                 if (!p)
2806                         goto out_resource;
2807                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2808         }
2809         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2810                 p = xdr_reserve_space(xdr, 4);
2811                 if (!p)
2812                         goto out_resource;
2813                 *p++ = cpu_to_be32(255);
2814         }
2815         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2816                 p = xdr_reserve_space(xdr, 4);
2817                 if (!p)
2818                         goto out_resource;
2819                 *p++ = cpu_to_be32(statfs.f_namelen);
2820         }
2821         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2822                 p = xdr_reserve_space(xdr, 8);
2823                 if (!p)
2824                         goto out_resource;
2825                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2826         }
2827         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2828                 p = xdr_reserve_space(xdr, 8);
2829                 if (!p)
2830                         goto out_resource;
2831                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2832         }
2833         if (bmval1 & FATTR4_WORD1_MODE) {
2834                 p = xdr_reserve_space(xdr, 4);
2835                 if (!p)
2836                         goto out_resource;
2837                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2838         }
2839         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2840                 p = xdr_reserve_space(xdr, 4);
2841                 if (!p)
2842                         goto out_resource;
2843                 *p++ = cpu_to_be32(1);
2844         }
2845         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2846                 p = xdr_reserve_space(xdr, 4);
2847                 if (!p)
2848                         goto out_resource;
2849                 *p++ = cpu_to_be32(stat.nlink);
2850         }
2851         if (bmval1 & FATTR4_WORD1_OWNER) {
2852                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2853                 if (status)
2854                         goto out;
2855         }
2856         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2857                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2858                 if (status)
2859                         goto out;
2860         }
2861         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2862                 p = xdr_reserve_space(xdr, 8);
2863                 if (!p)
2864                         goto out_resource;
2865                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2866                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2867         }
2868         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2869                 p = xdr_reserve_space(xdr, 8);
2870                 if (!p)
2871                         goto out_resource;
2872                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2873                 p = xdr_encode_hyper(p, dummy64);
2874         }
2875         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2876                 p = xdr_reserve_space(xdr, 8);
2877                 if (!p)
2878                         goto out_resource;
2879                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2880                 p = xdr_encode_hyper(p, dummy64);
2881         }
2882         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2883                 p = xdr_reserve_space(xdr, 8);
2884                 if (!p)
2885                         goto out_resource;
2886                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2887                 p = xdr_encode_hyper(p, dummy64);
2888         }
2889         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2890                 p = xdr_reserve_space(xdr, 8);
2891                 if (!p)
2892                         goto out_resource;
2893                 dummy64 = (u64)stat.blocks << 9;
2894                 p = xdr_encode_hyper(p, dummy64);
2895         }
2896         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2897                 p = xdr_reserve_space(xdr, 12);
2898                 if (!p)
2899                         goto out_resource;
2900                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2901                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2902         }
2903         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2904                 p = xdr_reserve_space(xdr, 12);
2905                 if (!p)
2906                         goto out_resource;
2907                 p = encode_time_delta(p, d_inode(dentry));
2908         }
2909         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2910                 p = xdr_reserve_space(xdr, 12);
2911                 if (!p)
2912                         goto out_resource;
2913                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2914                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2915         }
2916         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2917                 p = xdr_reserve_space(xdr, 12);
2918                 if (!p)
2919                         goto out_resource;
2920                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2921                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2922         }
2923         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2924                 struct kstat parent_stat;
2925                 u64 ino = stat.ino;
2926
2927                 p = xdr_reserve_space(xdr, 8);
2928                 if (!p)
2929                         goto out_resource;
2930                 /*
2931                  * Get parent's attributes if not ignoring crossmount
2932                  * and this is the root of a cross-mounted filesystem.
2933                  */
2934                 if (ignore_crossmnt == 0 &&
2935                     dentry == exp->ex_path.mnt->mnt_root) {
2936                         err = get_parent_attributes(exp, &parent_stat);
2937                         if (err)
2938                                 goto out_nfserr;
2939                         ino = parent_stat.ino;
2940                 }
2941                 p = xdr_encode_hyper(p, ino);
2942         }
2943 #ifdef CONFIG_NFSD_PNFS
2944         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2945                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2946                 if (status)
2947                         goto out;
2948         }
2949
2950         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2951                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2952                 if (status)
2953                         goto out;
2954         }
2955
2956         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2957                 p = xdr_reserve_space(xdr, 4);
2958                 if (!p)
2959                         goto out_resource;
2960                 *p++ = cpu_to_be32(stat.blksize);
2961         }
2962 #endif /* CONFIG_NFSD_PNFS */
2963         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2964                 u32 supp[3];
2965
2966                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2967                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2968                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2969                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2970
2971                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2972                 if (status)
2973                         goto out;
2974         }
2975
2976         if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2977                 p = xdr_reserve_space(xdr, 4);
2978                 if (!p)
2979                         goto out_resource;
2980                 if (IS_I_VERSION(d_inode(dentry)))
2981                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2982                 else
2983                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2984         }
2985
2986 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2987         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2988                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2989                                                                 contextlen);
2990                 if (status)
2991                         goto out;
2992         }
2993 #endif
2994
2995         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2996         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2997         status = nfs_ok;
2998
2999 out:
3000 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3001         if (context)
3002                 security_release_secctx(context, contextlen);
3003 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3004         kfree(acl);
3005         if (tempfh) {
3006                 fh_put(tempfh);
3007                 kfree(tempfh);
3008         }
3009         if (status)
3010                 xdr_truncate_encode(xdr, starting_len);
3011         return status;
3012 out_nfserr:
3013         status = nfserrno(err);
3014         goto out;
3015 out_resource:
3016         status = nfserr_resource;
3017         goto out;
3018 }
3019
3020 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3021                                 struct xdr_buf *buf, __be32 *p, int bytes)
3022 {
3023         xdr->scratch.iov_len = 0;
3024         memset(buf, 0, sizeof(struct xdr_buf));
3025         buf->head[0].iov_base = p;
3026         buf->head[0].iov_len = 0;
3027         buf->len = 0;
3028         xdr->buf = buf;
3029         xdr->iov = buf->head;
3030         xdr->p = p;
3031         xdr->end = (void *)p + bytes;
3032         buf->buflen = bytes;
3033 }
3034
3035 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3036                         struct svc_fh *fhp, struct svc_export *exp,
3037                         struct dentry *dentry, u32 *bmval,
3038                         struct svc_rqst *rqstp, int ignore_crossmnt)
3039 {
3040         struct xdr_buf dummy;
3041         struct xdr_stream xdr;
3042         __be32 ret;
3043
3044         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3045         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3046                                                         ignore_crossmnt);
3047         *p = xdr.p;
3048         return ret;
3049 }
3050
3051 static inline int attributes_need_mount(u32 *bmval)
3052 {
3053         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3054                 return 1;
3055         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3056                 return 1;
3057         return 0;
3058 }
3059
3060 static __be32
3061 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3062                         const char *name, int namlen)
3063 {
3064         struct svc_export *exp = cd->rd_fhp->fh_export;
3065         struct dentry *dentry;
3066         __be32 nfserr;
3067         int ignore_crossmnt = 0;
3068
3069         dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3070         if (IS_ERR(dentry))
3071                 return nfserrno(PTR_ERR(dentry));
3072
3073         exp_get(exp);
3074         /*
3075          * In the case of a mountpoint, the client may be asking for
3076          * attributes that are only properties of the underlying filesystem
3077          * as opposed to the cross-mounted file system. In such a case,
3078          * we will not follow the cross mount and will fill the attribtutes
3079          * directly from the mountpoint dentry.
3080          */
3081         if (nfsd_mountpoint(dentry, exp)) {
3082                 int err;
3083
3084                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3085                                 && !attributes_need_mount(cd->rd_bmval)) {
3086                         ignore_crossmnt = 1;
3087                         goto out_encode;
3088                 }
3089                 /*
3090                  * Why the heck aren't we just using nfsd_lookup??
3091                  * Different "."/".." handling?  Something else?
3092                  * At least, add a comment here to explain....
3093                  */
3094                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3095                 if (err) {
3096                         nfserr = nfserrno(err);
3097                         goto out_put;
3098                 }
3099                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3100                 if (nfserr)
3101                         goto out_put;
3102
3103         }
3104 out_encode:
3105         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3106                                         cd->rd_rqstp, ignore_crossmnt);
3107 out_put:
3108         dput(dentry);
3109         exp_put(exp);
3110         return nfserr;
3111 }
3112
3113 static __be32 *
3114 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3115 {
3116         __be32 *p;
3117
3118         p = xdr_reserve_space(xdr, 20);
3119         if (!p)
3120                 return NULL;
3121         *p++ = htonl(2);
3122         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3123         *p++ = htonl(0);                         /* bmval1 */
3124
3125         *p++ = htonl(4);     /* attribute length */
3126         *p++ = nfserr;       /* no htonl */
3127         return p;
3128 }
3129
3130 static int
3131 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3132                     loff_t offset, u64 ino, unsigned int d_type)
3133 {
3134         struct readdir_cd *ccd = ccdv;
3135         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3136         struct xdr_stream *xdr = cd->xdr;
3137         int start_offset = xdr->buf->len;
3138         int cookie_offset;
3139         u32 name_and_cookie;
3140         int entry_bytes;
3141         __be32 nfserr = nfserr_toosmall;
3142         __be64 wire_offset;
3143         __be32 *p;
3144
3145         /* In nfsv4, "." and ".." never make it onto the wire.. */
3146         if (name && isdotent(name, namlen)) {
3147                 cd->common.err = nfs_ok;
3148                 return 0;
3149         }
3150
3151         if (cd->cookie_offset) {
3152                 wire_offset = cpu_to_be64(offset);
3153                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3154                                                         &wire_offset, 8);
3155         }
3156
3157         p = xdr_reserve_space(xdr, 4);
3158         if (!p)
3159                 goto fail;
3160         *p++ = xdr_one;                             /* mark entry present */
3161         cookie_offset = xdr->buf->len;
3162         p = xdr_reserve_space(xdr, 3*4 + namlen);
3163         if (!p)
3164                 goto fail;
3165         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3166         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3167
3168         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3169         switch (nfserr) {
3170         case nfs_ok:
3171                 break;
3172         case nfserr_resource:
3173                 nfserr = nfserr_toosmall;
3174                 goto fail;
3175         case nfserr_noent:
3176                 xdr_truncate_encode(xdr, start_offset);
3177                 goto skip_entry;
3178         default:
3179                 /*
3180                  * If the client requested the RDATTR_ERROR attribute,
3181                  * we stuff the error code into this attribute
3182                  * and continue.  If this attribute was not requested,
3183                  * then in accordance with the spec, we fail the
3184                  * entire READDIR operation(!)
3185                  */
3186                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3187                         goto fail;
3188                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3189                 if (p == NULL) {
3190                         nfserr = nfserr_toosmall;
3191                         goto fail;
3192                 }
3193         }
3194         nfserr = nfserr_toosmall;
3195         entry_bytes = xdr->buf->len - start_offset;
3196         if (entry_bytes > cd->rd_maxcount)
3197                 goto fail;
3198         cd->rd_maxcount -= entry_bytes;
3199         /*
3200          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3201          * let's always let through the first entry, at least:
3202          */
3203         if (!cd->rd_dircount)
3204                 goto fail;
3205         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3206         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3207                 goto fail;
3208         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3209
3210         cd->cookie_offset = cookie_offset;
3211 skip_entry:
3212         cd->common.err = nfs_ok;
3213         return 0;
3214 fail:
3215         xdr_truncate_encode(xdr, start_offset);
3216         cd->common.err = nfserr;
3217         return -EINVAL;
3218 }
3219
3220 static __be32
3221 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3222 {
3223         __be32 *p;
3224
3225         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3226         if (!p)
3227                 return nfserr_resource;
3228         *p++ = cpu_to_be32(sid->si_generation);
3229         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3230                                         sizeof(stateid_opaque_t));
3231         return 0;
3232 }
3233
3234 static __be32
3235 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3236 {
3237         struct xdr_stream *xdr = &resp->xdr;
3238         __be32 *p;
3239
3240         p = xdr_reserve_space(xdr, 8);
3241         if (!p)
3242                 return nfserr_resource;
3243         *p++ = cpu_to_be32(access->ac_supported);
3244         *p++ = cpu_to_be32(access->ac_resp_access);
3245         return 0;
3246 }
3247
3248 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3249 {
3250         struct xdr_stream *xdr = &resp->xdr;
3251         __be32 *p;
3252
3253         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3254         if (!p)
3255                 return nfserr_resource;
3256         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3257                                         NFS4_MAX_SESSIONID_LEN);
3258         *p++ = cpu_to_be32(bcts->dir);
3259         /* Upshifting from TCP to RDMA is not supported */
3260         *p++ = cpu_to_be32(0);
3261         return 0;
3262 }
3263
3264 static __be32
3265 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3266 {
3267         struct xdr_stream *xdr = &resp->xdr;
3268
3269         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3270 }
3271
3272
3273 static __be32
3274 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3275 {
3276         struct xdr_stream *xdr = &resp->xdr;
3277         __be32 *p;
3278
3279         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3280         if (!p)
3281                 return nfserr_resource;
3282         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3283                                                 NFS4_VERIFIER_SIZE);
3284         return 0;
3285 }
3286
3287 static __be32
3288 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3289 {
3290         struct xdr_stream *xdr = &resp->xdr;
3291         __be32 *p;
3292
3293         p = xdr_reserve_space(xdr, 20);
3294         if (!p)
3295                 return nfserr_resource;
3296         encode_cinfo(p, &create->cr_cinfo);
3297         return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3298                         create->cr_bmval[1], create->cr_bmval[2]);
3299 }
3300
3301 static __be32
3302 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3303 {
3304         struct svc_fh *fhp = getattr->ga_fhp;
3305         struct xdr_stream *xdr = &resp->xdr;
3306
3307         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3308                                     getattr->ga_bmval, resp->rqstp, 0);
3309 }
3310
3311 static __be32
3312 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3313 {
3314         struct xdr_stream *xdr = &resp->xdr;
3315         struct svc_fh *fhp = *fhpp;
3316         unsigned int len;
3317         __be32 *p;
3318
3319         len = fhp->fh_handle.fh_size;
3320         p = xdr_reserve_space(xdr, len + 4);
3321         if (!p)
3322                 return nfserr_resource;
3323         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3324         return 0;
3325 }
3326
3327 /*
3328 * Including all fields other than the name, a LOCK4denied structure requires
3329 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3330 */
3331 static __be32
3332 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3333 {
3334         struct xdr_netobj *conf = &ld->ld_owner;
3335         __be32 *p;
3336
3337 again:
3338         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3339         if (!p) {
3340                 /*
3341                  * Don't fail to return the result just because we can't
3342                  * return the conflicting open:
3343                  */
3344                 if (conf->len) {
3345                         kfree(conf->data);
3346                         conf->len = 0;
3347                         conf->data = NULL;
3348                         goto again;
3349                 }
3350                 return nfserr_resource;
3351         }
3352         p = xdr_encode_hyper(p, ld->ld_start);
3353         p = xdr_encode_hyper(p, ld->ld_length);
3354         *p++ = cpu_to_be32(ld->ld_type);
3355         if (conf->len) {
3356                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3357                 p = xdr_encode_opaque(p, conf->data, conf->len);
3358                 kfree(conf->data);
3359         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3360                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3361                 *p++ = cpu_to_be32(0); /* length of owner name */
3362         }
3363         return nfserr_denied;
3364 }
3365
3366 static __be32
3367 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3368 {
3369         struct xdr_stream *xdr = &resp->xdr;
3370
3371         if (!nfserr)
3372                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3373         else if (nfserr == nfserr_denied)
3374                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3375
3376         return nfserr;
3377 }
3378
3379 static __be32
3380 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3381 {
3382         struct xdr_stream *xdr = &resp->xdr;
3383
3384         if (nfserr == nfserr_denied)
3385                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3386         return nfserr;
3387 }
3388
3389 static __be32
3390 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3391 {
3392         struct xdr_stream *xdr = &resp->xdr;
3393
3394         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3395 }
3396
3397
3398 static __be32
3399 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3400 {
3401         struct xdr_stream *xdr = &resp->xdr;
3402         __be32 *p;
3403
3404         p = xdr_reserve_space(xdr, 20);
3405         if (!p)
3406                 return nfserr_resource;
3407         p = encode_cinfo(p, &link->li_cinfo);
3408         return 0;
3409 }
3410
3411
3412 static __be32
3413 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3414 {
3415         struct xdr_stream *xdr = &resp->xdr;
3416         __be32 *p;
3417
3418         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3419         if (nfserr)
3420                 return nfserr;
3421         p = xdr_reserve_space(xdr, 24);
3422         if (!p)
3423                 return nfserr_resource;
3424         p = encode_cinfo(p, &open->op_cinfo);
3425         *p++ = cpu_to_be32(open->op_rflags);
3426
3427         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3428                                         open->op_bmval[2]);
3429         if (nfserr)
3430                 return nfserr;
3431
3432         p = xdr_reserve_space(xdr, 4);
3433         if (!p)
3434                 return nfserr_resource;
3435
3436         *p++ = cpu_to_be32(open->op_delegate_type);
3437         switch (open->op_delegate_type) {
3438         case NFS4_OPEN_DELEGATE_NONE:
3439                 break;
3440         case NFS4_OPEN_DELEGATE_READ:
3441                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3442                 if (nfserr)
3443                         return nfserr;
3444                 p = xdr_reserve_space(xdr, 20);
3445                 if (!p)
3446                         return nfserr_resource;
3447                 *p++ = cpu_to_be32(open->op_recall);
3448
3449                 /*
3450                  * TODO: ACE's in delegations
3451                  */
3452                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3453                 *p++ = cpu_to_be32(0);
3454                 *p++ = cpu_to_be32(0);
3455                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3456                 break;
3457         case NFS4_OPEN_DELEGATE_WRITE:
3458                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3459                 if (nfserr)
3460                         return nfserr;
3461                 p = xdr_reserve_space(xdr, 32);
3462                 if (!p)
3463                         return nfserr_resource;
3464                 *p++ = cpu_to_be32(0);
3465
3466                 /*
3467                  * TODO: space_limit's in delegations
3468                  */
3469                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3470                 *p++ = cpu_to_be32(~(u32)0);
3471                 *p++ = cpu_to_be32(~(u32)0);
3472
3473                 /*
3474                  * TODO: ACE's in delegations
3475                  */
3476                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3477                 *p++ = cpu_to_be32(0);
3478                 *p++ = cpu_to_be32(0);
3479                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3480                 break;
3481         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3482                 switch (open->op_why_no_deleg) {
3483                 case WND4_CONTENTION:
3484                 case WND4_RESOURCE:
3485                         p = xdr_reserve_space(xdr, 8);
3486                         if (!p)
3487                                 return nfserr_resource;
3488                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3489                         /* deleg signaling not supported yet: */
3490                         *p++ = cpu_to_be32(0);
3491                         break;
3492                 default:
3493                         p = xdr_reserve_space(xdr, 4);
3494                         if (!p)
3495                                 return nfserr_resource;
3496                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3497                 }
3498                 break;
3499         default:
3500                 BUG();
3501         }
3502         /* XXX save filehandle here */
3503         return 0;
3504 }
3505
3506 static __be32
3507 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3508 {
3509         struct xdr_stream *xdr = &resp->xdr;
3510
3511         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3512 }
3513
3514 static __be32
3515 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3516 {
3517         struct xdr_stream *xdr = &resp->xdr;
3518
3519         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3520 }
3521
3522 static __be32 nfsd4_encode_splice_read(
3523                                 struct nfsd4_compoundres *resp,
3524                                 struct nfsd4_read *read,
3525                                 struct file *file, unsigned long maxcount)
3526 {
3527         struct xdr_stream *xdr = &resp->xdr;
3528         struct xdr_buf *buf = xdr->buf;
3529         u32 eof;
3530         int space_left;
3531         __be32 nfserr;
3532         __be32 *p = xdr->p - 2;
3533
3534         /* Make sure there will be room for padding if needed */
3535         if (xdr->end - xdr->p < 1)
3536                 return nfserr_resource;
3537
3538         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3539                                   file, read->rd_offset, &maxcount, &eof);
3540         read->rd_length = maxcount;
3541         if (nfserr) {
3542                 /*
3543                  * nfsd_splice_actor may have already messed with the
3544                  * page length; reset it so as not to confuse
3545                  * xdr_truncate_encode:
3546                  */
3547                 buf->page_len = 0;
3548                 return nfserr;
3549         }
3550
3551         *(p++) = htonl(eof);
3552         *(p++) = htonl(maxcount);
3553
3554         buf->page_len = maxcount;
3555         buf->len += maxcount;
3556         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3557                                                         / PAGE_SIZE;
3558
3559         /* Use rest of head for padding and remaining ops: */
3560         buf->tail[0].iov_base = xdr->p;
3561         buf->tail[0].iov_len = 0;
3562         xdr->iov = buf->tail;
3563         if (maxcount&3) {
3564                 int pad = 4 - (maxcount&3);
3565
3566                 *(xdr->p++) = 0;
3567
3568                 buf->tail[0].iov_base += maxcount&3;
3569                 buf->tail[0].iov_len = pad;
3570                 buf->len += pad;
3571         }
3572
3573         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3574                                 buf->buflen - buf->len);
3575         buf->buflen = buf->len + space_left;
3576         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3577
3578         return 0;
3579 }
3580
3581 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3582                                  struct nfsd4_read *read,
3583                                  struct file *file, unsigned long maxcount)
3584 {
3585         struct xdr_stream *xdr = &resp->xdr;
3586         u32 eof;
3587         int v;
3588         int starting_len = xdr->buf->len - 8;
3589         long len;
3590         int thislen;
3591         __be32 nfserr;
3592         __be32 tmp;
3593         __be32 *p;
3594         int pad;
3595
3596         /*
3597          * svcrdma requires every READ payload to start somewhere
3598          * in xdr->pages.
3599          */
3600         if (xdr->iov == xdr->buf->head) {
3601                 xdr->iov = NULL;
3602                 xdr->end = xdr->p;
3603         }
3604
3605         len = maxcount;
3606         v = 0;
3607         while (len) {
3608                 thislen = min_t(long, len, PAGE_SIZE);
3609                 p = xdr_reserve_space(xdr, thislen);
3610                 WARN_ON_ONCE(!p);
3611                 resp->rqstp->rq_vec[v].iov_base = p;
3612                 resp->rqstp->rq_vec[v].iov_len = thislen;
3613                 v++;
3614                 len -= thislen;
3615         }
3616         read->rd_vlen = v;
3617
3618         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3619                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
3620                             &eof);
3621         read->rd_length = maxcount;
3622         if (nfserr)
3623                 return nfserr;
3624         if (svc_encode_read_payload(resp->rqstp, starting_len + 8, maxcount))
3625                 return nfserr_io;
3626         xdr_truncate_encode(xdr, starting_len + 8 + xdr_align_size(maxcount));
3627
3628         tmp = htonl(eof);
3629         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3630         tmp = htonl(maxcount);
3631         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3632
3633         tmp = xdr_zero;
3634         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3635         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3636                                                                 &tmp, pad);
3637         return 0;
3638
3639 }
3640
3641 static __be32
3642 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3643                   struct nfsd4_read *read)
3644 {
3645         unsigned long maxcount;
3646         struct xdr_stream *xdr = &resp->xdr;
3647         struct file *file;
3648         int starting_len = xdr->buf->len;
3649         __be32 *p;
3650
3651         if (nfserr)
3652                 return nfserr;
3653         file = read->rd_nf->nf_file;
3654
3655         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3656         if (!p) {
3657                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3658                 return nfserr_resource;
3659         }
3660         if (resp->xdr.buf->page_len &&
3661             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3662                 WARN_ON_ONCE(1);
3663                 return nfserr_resource;
3664         }
3665         xdr_commit_encode(xdr);
3666
3667         maxcount = svc_max_payload(resp->rqstp);
3668         maxcount = min_t(unsigned long, maxcount,
3669                          (xdr->buf->buflen - xdr->buf->len));
3670         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3671
3672         if (file->f_op->splice_read &&
3673             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3674                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3675         else
3676                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3677
3678         if (nfserr)
3679                 xdr_truncate_encode(xdr, starting_len);
3680
3681         return nfserr;
3682 }
3683
3684 static __be32
3685 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3686 {
3687         int maxcount;
3688         __be32 wire_count;
3689         int zero = 0;
3690         struct xdr_stream *xdr = &resp->xdr;
3691         int length_offset = xdr->buf->len;
3692         __be32 *p;
3693
3694         p = xdr_reserve_space(xdr, 4);
3695         if (!p)
3696                 return nfserr_resource;
3697         maxcount = PAGE_SIZE;
3698
3699         p = xdr_reserve_space(xdr, maxcount);
3700         if (!p)
3701                 return nfserr_resource;
3702         /*
3703          * XXX: By default, vfs_readlink() will truncate symlinks if they
3704          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3705          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3706          * that truncation occurred, and return NFS4ERR_RESOURCE.
3707          */
3708         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3709                                                 (char *)p, &maxcount);
3710         if (nfserr == nfserr_isdir)
3711                 nfserr = nfserr_inval;
3712         if (nfserr) {
3713                 xdr_truncate_encode(xdr, length_offset);
3714                 return nfserr;
3715         }
3716
3717         wire_count = htonl(maxcount);
3718         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3719         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3720         if (maxcount & 3)
3721                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3722                                                 &zero, 4 - (maxcount&3));
3723         return 0;
3724 }
3725
3726 static __be32
3727 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3728 {
3729         int maxcount;
3730         int bytes_left;
3731         loff_t offset;
3732         __be64 wire_offset;
3733         struct xdr_stream *xdr = &resp->xdr;
3734         int starting_len = xdr->buf->len;
3735         __be32 *p;
3736
3737         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3738         if (!p)
3739                 return nfserr_resource;
3740
3741         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3742         *p++ = cpu_to_be32(0);
3743         *p++ = cpu_to_be32(0);
3744         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3745                                 - (char *)resp->xdr.buf->head[0].iov_base;
3746
3747         /*
3748          * Number of bytes left for directory entries allowing for the
3749          * final 8 bytes of the readdir and a following failed op:
3750          */
3751         bytes_left = xdr->buf->buflen - xdr->buf->len
3752                         - COMPOUND_ERR_SLACK_SPACE - 8;
3753         if (bytes_left < 0) {
3754                 nfserr = nfserr_resource;
3755                 goto err_no_verf;
3756         }
3757         maxcount = svc_max_payload(resp->rqstp);
3758         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3759         /*
3760          * Note the rfc defines rd_maxcount as the size of the
3761          * READDIR4resok structure, which includes the verifier above
3762          * and the 8 bytes encoded at the end of this function:
3763          */
3764         if (maxcount < 16) {
3765                 nfserr = nfserr_toosmall;
3766                 goto err_no_verf;
3767         }
3768         maxcount = min_t(int, maxcount-16, bytes_left);
3769
3770         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3771         if (!readdir->rd_dircount)
3772                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3773
3774         readdir->xdr = xdr;
3775         readdir->rd_maxcount = maxcount;
3776         readdir->common.err = 0;
3777         readdir->cookie_offset = 0;
3778
3779         offset = readdir->rd_cookie;
3780         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3781                               &offset,
3782                               &readdir->common, nfsd4_encode_dirent);
3783         if (nfserr == nfs_ok &&
3784             readdir->common.err == nfserr_toosmall &&
3785             xdr->buf->len == starting_len + 8) {
3786                 /* nothing encoded; which limit did we hit?: */
3787                 if (maxcount - 16 < bytes_left)
3788                         /* It was the fault of rd_maxcount: */
3789                         nfserr = nfserr_toosmall;
3790                 else
3791                         /* We ran out of buffer space: */
3792                         nfserr = nfserr_resource;
3793         }
3794         if (nfserr)
3795                 goto err_no_verf;
3796
3797         if (readdir->cookie_offset) {
3798                 wire_offset = cpu_to_be64(offset);
3799                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3800                                                         &wire_offset, 8);
3801         }
3802
3803         p = xdr_reserve_space(xdr, 8);
3804         if (!p) {
3805                 WARN_ON_ONCE(1);
3806                 goto err_no_verf;
3807         }
3808         *p++ = 0;       /* no more entries */
3809         *p++ = htonl(readdir->common.err == nfserr_eof);
3810
3811         return 0;
3812 err_no_verf:
3813         xdr_truncate_encode(xdr, starting_len);
3814         return nfserr;
3815 }
3816
3817 static __be32
3818 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3819 {
3820         struct xdr_stream *xdr = &resp->xdr;
3821         __be32 *p;
3822
3823         p = xdr_reserve_space(xdr, 20);
3824         if (!p)
3825                 return nfserr_resource;
3826         p = encode_cinfo(p, &remove->rm_cinfo);
3827         return 0;
3828 }
3829
3830 static __be32
3831 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3832 {
3833         struct xdr_stream *xdr = &resp->xdr;
3834         __be32 *p;
3835
3836         p = xdr_reserve_space(xdr, 40);
3837         if (!p)
3838                 return nfserr_resource;
3839         p = encode_cinfo(p, &rename->rn_sinfo);
3840         p = encode_cinfo(p, &rename->rn_tinfo);
3841         return 0;
3842 }
3843
3844 static __be32
3845 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3846 {
3847         u32 i, nflavs, supported;
3848         struct exp_flavor_info *flavs;
3849         struct exp_flavor_info def_flavs[2];
3850         __be32 *p, *flavorsp;
3851         static bool report = true;
3852
3853         if (exp->ex_nflavors) {
3854                 flavs = exp->ex_flavors;
3855                 nflavs = exp->ex_nflavors;
3856         } else { /* Handling of some defaults in absence of real secinfo: */
3857                 flavs = def_flavs;
3858                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3859                         nflavs = 2;
3860                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3861                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3862                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3863                         nflavs = 1;
3864                         flavs[0].pseudoflavor
3865                                         = svcauth_gss_flavor(exp->ex_client);
3866                 } else {
3867                         nflavs = 1;
3868                         flavs[0].pseudoflavor
3869                                         = exp->ex_client->flavour->flavour;
3870                 }
3871         }
3872
3873         supported = 0;
3874         p = xdr_reserve_space(xdr, 4);
3875         if (!p)
3876                 return nfserr_resource;
3877         flavorsp = p++;         /* to be backfilled later */
3878
3879         for (i = 0; i < nflavs; i++) {
3880                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3881                 struct rpcsec_gss_info info;
3882
3883                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3884                         supported++;
3885                         p = xdr_reserve_space(xdr, 4 + 4 +
3886                                               XDR_LEN(info.oid.len) + 4 + 4);
3887                         if (!p)
3888                                 return nfserr_resource;
3889                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3890                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3891                         *p++ = cpu_to_be32(info.qop);
3892                         *p++ = cpu_to_be32(info.service);
3893                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3894                         supported++;
3895                         p = xdr_reserve_space(xdr, 4);
3896                         if (!p)
3897                                 return nfserr_resource;
3898                         *p++ = cpu_to_be32(pf);
3899                 } else {
3900                         if (report)
3901                                 pr_warn("NFS: SECINFO: security flavor %u "
3902                                         "is not supported\n", pf);
3903                 }
3904         }
3905
3906         if (nflavs != supported)
3907                 report = false;
3908         *flavorsp = htonl(supported);
3909         return 0;
3910 }
3911
3912 static __be32
3913 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3914                      struct nfsd4_secinfo *secinfo)
3915 {
3916         struct xdr_stream *xdr = &resp->xdr;
3917
3918         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3919 }
3920
3921 static __be32
3922 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3923                      struct nfsd4_secinfo_no_name *secinfo)
3924 {
3925         struct xdr_stream *xdr = &resp->xdr;
3926
3927         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3928 }
3929
3930 /*
3931  * The SETATTR encode routine is special -- it always encodes a bitmap,
3932  * regardless of the error status.
3933  */
3934 static __be32
3935 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3936 {
3937         struct xdr_stream *xdr = &resp->xdr;
3938         __be32 *p;
3939
3940         p = xdr_reserve_space(xdr, 16);
3941         if (!p)
3942                 return nfserr_resource;
3943         if (nfserr) {
3944                 *p++ = cpu_to_be32(3);
3945                 *p++ = cpu_to_be32(0);
3946                 *p++ = cpu_to_be32(0);
3947                 *p++ = cpu_to_be32(0);
3948         }
3949         else {
3950                 *p++ = cpu_to_be32(3);
3951                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3952                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3953                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3954         }
3955         return nfserr;
3956 }
3957
3958 static __be32
3959 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3960 {
3961         struct xdr_stream *xdr = &resp->xdr;
3962         __be32 *p;
3963
3964         if (!nfserr) {
3965                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3966                 if (!p)
3967                         return nfserr_resource;
3968                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3969                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3970                                                 NFS4_VERIFIER_SIZE);
3971         }
3972         else if (nfserr == nfserr_clid_inuse) {
3973                 p = xdr_reserve_space(xdr, 8);
3974                 if (!p)
3975                         return nfserr_resource;
3976                 *p++ = cpu_to_be32(0);
3977                 *p++ = cpu_to_be32(0);
3978         }
3979         return nfserr;
3980 }
3981
3982 static __be32
3983 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3984 {
3985         struct xdr_stream *xdr = &resp->xdr;
3986         __be32 *p;
3987
3988         p = xdr_reserve_space(xdr, 16);
3989         if (!p)
3990                 return nfserr_resource;
3991         *p++ = cpu_to_be32(write->wr_bytes_written);
3992         *p++ = cpu_to_be32(write->wr_how_written);
3993         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3994                                                 NFS4_VERIFIER_SIZE);
3995         return 0;
3996 }
3997
3998 static __be32
3999 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4000                          struct nfsd4_exchange_id *exid)
4001 {
4002         struct xdr_stream *xdr = &resp->xdr;
4003         __be32 *p;
4004         char *major_id;
4005         char *server_scope;
4006         int major_id_sz;
4007         int server_scope_sz;
4008         uint64_t minor_id = 0;
4009         struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4010
4011         major_id = nn->nfsd_name;
4012         major_id_sz = strlen(nn->nfsd_name);
4013         server_scope = nn->nfsd_name;
4014         server_scope_sz = strlen(nn->nfsd_name);
4015
4016         p = xdr_reserve_space(xdr,
4017                 8 /* eir_clientid */ +
4018                 4 /* eir_sequenceid */ +
4019                 4 /* eir_flags */ +
4020                 4 /* spr_how */);
4021         if (!p)
4022                 return nfserr_resource;
4023
4024         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4025         *p++ = cpu_to_be32(exid->seqid);
4026         *p++ = cpu_to_be32(exid->flags);
4027
4028         *p++ = cpu_to_be32(exid->spa_how);
4029
4030         switch (exid->spa_how) {
4031         case SP4_NONE:
4032                 break;
4033         case SP4_MACH_CRED:
4034                 /* spo_must_enforce bitmap: */
4035                 nfserr = nfsd4_encode_bitmap(xdr,
4036                                         exid->spo_must_enforce[0],
4037                                         exid->spo_must_enforce[1],
4038                                         exid->spo_must_enforce[2]);
4039                 if (nfserr)
4040                         return nfserr;
4041                 /* spo_must_allow bitmap: */
4042                 nfserr = nfsd4_encode_bitmap(xdr,
4043                                         exid->spo_must_allow[0],
4044                                         exid->spo_must_allow[1],
4045                                         exid->spo_must_allow[2]);
4046                 if (nfserr)
4047                         return nfserr;
4048                 break;
4049         default:
4050                 WARN_ON_ONCE(1);
4051         }
4052
4053         p = xdr_reserve_space(xdr,
4054                 8 /* so_minor_id */ +
4055                 4 /* so_major_id.len */ +
4056                 (XDR_QUADLEN(major_id_sz) * 4) +
4057                 4 /* eir_server_scope.len */ +
4058                 (XDR_QUADLEN(server_scope_sz) * 4) +
4059                 4 /* eir_server_impl_id.count (0) */);
4060         if (!p)
4061                 return nfserr_resource;
4062
4063         /* The server_owner struct */
4064         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4065         /* major id */
4066         p = xdr_encode_opaque(p, major_id, major_id_sz);
4067
4068         /* Server scope */
4069         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4070
4071         /* Implementation id */
4072         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4073         return 0;
4074 }
4075
4076 static __be32
4077 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4078                             struct nfsd4_create_session *sess)
4079 {
4080         struct xdr_stream *xdr = &resp->xdr;
4081         __be32 *p;
4082
4083         p = xdr_reserve_space(xdr, 24);
4084         if (!p)
4085                 return nfserr_resource;
4086         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4087                                         NFS4_MAX_SESSIONID_LEN);
4088         *p++ = cpu_to_be32(sess->seqid);
4089         *p++ = cpu_to_be32(sess->flags);
4090
4091         p = xdr_reserve_space(xdr, 28);
4092         if (!p)
4093                 return nfserr_resource;
4094         *p++ = cpu_to_be32(0); /* headerpadsz */
4095         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4096         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4097         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4098         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4099         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4100         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4101
4102         if (sess->fore_channel.nr_rdma_attrs) {
4103                 p = xdr_reserve_space(xdr, 4);
4104                 if (!p)
4105                         return nfserr_resource;
4106                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4107         }
4108
4109         p = xdr_reserve_space(xdr, 28);
4110         if (!p)
4111                 return nfserr_resource;
4112         *p++ = cpu_to_be32(0); /* headerpadsz */
4113         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4114         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4115         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4116         *p++ = cpu_to_be32(sess->back_channel.maxops);
4117         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4118         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4119
4120         if (sess->back_channel.nr_rdma_attrs) {
4121                 p = xdr_reserve_space(xdr, 4);
4122                 if (!p)
4123                         return nfserr_resource;
4124                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4125         }
4126         return 0;
4127 }
4128
4129 static __be32
4130 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4131                       struct nfsd4_sequence *seq)
4132 {
4133         struct xdr_stream *xdr = &resp->xdr;
4134         __be32 *p;
4135
4136         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4137         if (!p)
4138                 return nfserr_resource;
4139         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4140                                         NFS4_MAX_SESSIONID_LEN);
4141         *p++ = cpu_to_be32(seq->seqid);
4142         *p++ = cpu_to_be32(seq->slotid);
4143         /* Note slotid's are numbered from zero: */
4144         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4145         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4146         *p++ = cpu_to_be32(seq->status_flags);
4147
4148         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4149         return 0;
4150 }
4151
4152 static __be32
4153 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4154                           struct nfsd4_test_stateid *test_stateid)
4155 {
4156         struct xdr_stream *xdr = &resp->xdr;
4157         struct nfsd4_test_stateid_id *stateid, *next;
4158         __be32 *p;
4159
4160         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4161         if (!p)
4162                 return nfserr_resource;
4163         *p++ = htonl(test_stateid->ts_num_ids);
4164
4165         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4166                 *p++ = stateid->ts_id_status;
4167         }
4168
4169         return 0;
4170 }
4171
4172 #ifdef CONFIG_NFSD_PNFS
4173 static __be32
4174 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4175                 struct nfsd4_getdeviceinfo *gdev)
4176 {
4177         struct xdr_stream *xdr = &resp->xdr;
4178         const struct nfsd4_layout_ops *ops;
4179         u32 starting_len = xdr->buf->len, needed_len;
4180         __be32 *p;
4181
4182         p = xdr_reserve_space(xdr, 4);
4183         if (!p)
4184                 return nfserr_resource;
4185
4186         *p++ = cpu_to_be32(gdev->gd_layout_type);
4187
4188         /* If maxcount is 0 then just update notifications */
4189         if (gdev->gd_maxcount != 0) {
4190                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4191                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4192                 if (nfserr) {
4193                         /*
4194                          * We don't bother to burden the layout drivers with
4195                          * enforcing gd_maxcount, just tell the client to
4196                          * come back with a bigger buffer if it's not enough.
4197                          */
4198                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4199                                 goto toosmall;
4200                         return nfserr;
4201                 }
4202         }
4203
4204         if (gdev->gd_notify_types) {
4205                 p = xdr_reserve_space(xdr, 4 + 4);
4206                 if (!p)
4207                         return nfserr_resource;
4208                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4209                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4210         } else {
4211                 p = xdr_reserve_space(xdr, 4);
4212                 if (!p)
4213                         return nfserr_resource;
4214                 *p++ = 0;
4215         }
4216
4217         return 0;
4218 toosmall:
4219         dprintk("%s: maxcount too small\n", __func__);
4220         needed_len = xdr->buf->len + 4 /* notifications */;
4221         xdr_truncate_encode(xdr, starting_len);
4222         p = xdr_reserve_space(xdr, 4);
4223         if (!p)
4224                 return nfserr_resource;
4225         *p++ = cpu_to_be32(needed_len);
4226         return nfserr_toosmall;
4227 }
4228
4229 static __be32
4230 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4231                 struct nfsd4_layoutget *lgp)
4232 {
4233         struct xdr_stream *xdr = &resp->xdr;
4234         const struct nfsd4_layout_ops *ops;
4235         __be32 *p;
4236
4237         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4238         if (!p)
4239                 return nfserr_resource;
4240
4241         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4242         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4243         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4244                                     sizeof(stateid_opaque_t));
4245
4246         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4247         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4248         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4249         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4250         *p++ = cpu_to_be32(lgp->lg_layout_type);
4251
4252         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4253         return ops->encode_layoutget(xdr, lgp);
4254 }
4255
4256 static __be32
4257 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4258                           struct nfsd4_layoutcommit *lcp)
4259 {
4260         struct xdr_stream *xdr = &resp->xdr;
4261         __be32 *p;
4262
4263         p = xdr_reserve_space(xdr, 4);
4264         if (!p)
4265                 return nfserr_resource;
4266         *p++ = cpu_to_be32(lcp->lc_size_chg);
4267         if (lcp->lc_size_chg) {
4268                 p = xdr_reserve_space(xdr, 8);
4269                 if (!p)
4270                         return nfserr_resource;
4271                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4272         }
4273
4274         return 0;
4275 }
4276
4277 static __be32
4278 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4279                 struct nfsd4_layoutreturn *lrp)
4280 {
4281         struct xdr_stream *xdr = &resp->xdr;
4282         __be32 *p;
4283
4284         p = xdr_reserve_space(xdr, 4);
4285         if (!p)
4286                 return nfserr_resource;
4287         *p++ = cpu_to_be32(lrp->lrs_present);
4288         if (lrp->lrs_present)
4289                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4290         return 0;
4291 }
4292 #endif /* CONFIG_NFSD_PNFS */
4293
4294 static __be32
4295 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4296                 struct nfsd42_write_res *write, bool sync)
4297 {
4298         __be32 *p;
4299         p = xdr_reserve_space(&resp->xdr, 4);
4300         if (!p)
4301                 return nfserr_resource;
4302
4303         if (sync)
4304                 *p++ = cpu_to_be32(0);
4305         else {
4306                 __be32 nfserr;
4307                 *p++ = cpu_to_be32(1);
4308                 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4309                 if (nfserr)
4310                         return nfserr;
4311         }
4312         p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4313         if (!p)
4314                 return nfserr_resource;
4315
4316         p = xdr_encode_hyper(p, write->wr_bytes_written);
4317         *p++ = cpu_to_be32(write->wr_stable_how);
4318         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4319                                     NFS4_VERIFIER_SIZE);
4320         return nfs_ok;
4321 }
4322
4323 static __be32
4324 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4325 {
4326         struct xdr_stream *xdr = &resp->xdr;
4327         struct nfs42_netaddr *addr;
4328         __be32 *p;
4329
4330         p = xdr_reserve_space(xdr, 4);
4331         *p++ = cpu_to_be32(ns->nl4_type);
4332
4333         switch (ns->nl4_type) {
4334         case NL4_NETADDR:
4335                 addr = &ns->u.nl4_addr;
4336
4337                 /* netid_len, netid, uaddr_len, uaddr (port included
4338                  * in RPCBIND_MAXUADDRLEN)
4339                  */
4340                 p = xdr_reserve_space(xdr,
4341                         4 /* netid len */ +
4342                         (XDR_QUADLEN(addr->netid_len) * 4) +
4343                         4 /* uaddr len */ +
4344                         (XDR_QUADLEN(addr->addr_len) * 4));
4345                 if (!p)
4346                         return nfserr_resource;
4347
4348                 *p++ = cpu_to_be32(addr->netid_len);
4349                 p = xdr_encode_opaque_fixed(p, addr->netid,
4350                                             addr->netid_len);
4351                 *p++ = cpu_to_be32(addr->addr_len);
4352                 p = xdr_encode_opaque_fixed(p, addr->addr,
4353                                         addr->addr_len);
4354                 break;
4355         default:
4356                 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4357                 return nfserr_inval;
4358         }
4359
4360         return 0;
4361 }
4362
4363 static __be32
4364 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4365                   struct nfsd4_copy *copy)
4366 {
4367         __be32 *p;
4368
4369         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4370                         copy->cp_synchronous);
4371         if (nfserr)
4372                 return nfserr;
4373
4374         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4375         *p++ = xdr_one; /* cr_consecutive */
4376         *p++ = cpu_to_be32(copy->cp_synchronous);
4377         return 0;
4378 }
4379
4380 static __be32
4381 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4382                             struct nfsd4_offload_status *os)
4383 {
4384         struct xdr_stream *xdr = &resp->xdr;
4385         __be32 *p;
4386
4387         p = xdr_reserve_space(xdr, 8 + 4);
4388         if (!p)
4389                 return nfserr_resource;
4390         p = xdr_encode_hyper(p, os->count);
4391         *p++ = cpu_to_be32(0);
4392
4393         return nfserr;
4394 }
4395
4396 static __be32
4397 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4398                          struct nfsd4_copy_notify *cn)
4399 {
4400         struct xdr_stream *xdr = &resp->xdr;
4401         __be32 *p;
4402
4403         if (nfserr)
4404                 return nfserr;
4405
4406         /* 8 sec, 4 nsec */
4407         p = xdr_reserve_space(xdr, 12);
4408         if (!p)
4409                 return nfserr_resource;
4410
4411         /* cnr_lease_time */
4412         p = xdr_encode_hyper(p, cn->cpn_sec);
4413         *p++ = cpu_to_be32(cn->cpn_nsec);
4414
4415         /* cnr_stateid */
4416         nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4417         if (nfserr)
4418                 return nfserr;
4419
4420         /* cnr_src.nl_nsvr */
4421         p = xdr_reserve_space(xdr, 4);
4422         if (!p)
4423                 return nfserr_resource;
4424
4425         *p++ = cpu_to_be32(1);
4426
4427         return nfsd42_encode_nl4_server(resp, &cn->cpn_src);
4428 }
4429
4430 static __be32
4431 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4432                   struct nfsd4_seek *seek)
4433 {
4434         __be32 *p;
4435
4436         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4437         *p++ = cpu_to_be32(seek->seek_eof);
4438         p = xdr_encode_hyper(p, seek->seek_pos);
4439
4440         return 0;
4441 }
4442
4443 static __be32
4444 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4445 {
4446         return nfserr;
4447 }
4448
4449 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4450
4451 /*
4452  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4453  * since we don't need to filter out obsolete ops as this is
4454  * done in the decoding phase.
4455  */
4456 static const nfsd4_enc nfsd4_enc_ops[] = {
4457         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4458         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4459         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4460         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4461         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4462         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4463         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4464         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4465         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4466         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4467         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4468         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4469         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4470         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4471         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4472         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4473         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4474         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4475         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4476         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4477         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4478         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4479         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4480         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4481         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4482         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4483         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4484         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4485         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4486         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4487         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4488         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4489         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4490         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4491         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4492         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4493         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4494
4495         /* NFSv4.1 operations */
4496         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4497         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4498         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4499         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4500         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4501         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4502         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4503 #ifdef CONFIG_NFSD_PNFS
4504         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4505         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4506         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4507         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4508         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4509 #else
4510         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4511         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4512         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4513         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4514         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4515 #endif
4516         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4517         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4518         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4519         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4520         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4521         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4522         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4523
4524         /* NFSv4.2 operations */
4525         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4526         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4527         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_copy_notify,
4528         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4529         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4530         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4531         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4532         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4533         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_offload_status,
4534         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4535         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4536         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4537         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4538 };
4539
4540 /*
4541  * Calculate whether we still have space to encode repsize bytes.
4542  * There are two considerations:
4543  *     - For NFS versions >=4.1, the size of the reply must stay within
4544  *       session limits
4545  *     - For all NFS versions, we must stay within limited preallocated
4546  *       buffer space.
4547  *
4548  * This is called before the operation is processed, so can only provide
4549  * an upper estimate.  For some nonidempotent operations (such as
4550  * getattr), it's not necessarily a problem if that estimate is wrong,
4551  * as we can fail it after processing without significant side effects.
4552  */
4553 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4554 {
4555         struct xdr_buf *buf = &resp->rqstp->rq_res;
4556         struct nfsd4_slot *slot = resp->cstate.slot;
4557
4558         if (buf->len + respsize <= buf->buflen)
4559                 return nfs_ok;
4560         if (!nfsd4_has_session(&resp->cstate))
4561                 return nfserr_resource;
4562         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4563                 WARN_ON_ONCE(1);
4564                 return nfserr_rep_too_big_to_cache;
4565         }
4566         return nfserr_rep_too_big;
4567 }
4568
4569 void
4570 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4571 {
4572         struct xdr_stream *xdr = &resp->xdr;
4573         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4574         struct svc_rqst *rqstp = resp->rqstp;
4575         const struct nfsd4_operation *opdesc = op->opdesc;
4576         int post_err_offset;
4577         nfsd4_enc encoder;
4578         __be32 *p;
4579
4580         p = xdr_reserve_space(xdr, 8);
4581         if (!p) {
4582                 WARN_ON_ONCE(1);
4583                 return;
4584         }
4585         *p++ = cpu_to_be32(op->opnum);
4586         post_err_offset = xdr->buf->len;
4587
4588         if (op->opnum == OP_ILLEGAL)
4589                 goto status;
4590         if (op->status && opdesc &&
4591                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4592                 goto status;
4593         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4594                !nfsd4_enc_ops[op->opnum]);
4595         encoder = nfsd4_enc_ops[op->opnum];
4596         op->status = encoder(resp, op->status, &op->u);
4597         if (opdesc && opdesc->op_release)
4598                 opdesc->op_release(&op->u);
4599         xdr_commit_encode(xdr);
4600
4601         /* nfsd4_check_resp_size guarantees enough room for error status */
4602         if (!op->status) {
4603                 int space_needed = 0;
4604                 if (!nfsd4_last_compound_op(rqstp))
4605                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4606                 op->status = nfsd4_check_resp_size(resp, space_needed);
4607         }
4608         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4609                 struct nfsd4_slot *slot = resp->cstate.slot;
4610
4611                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4612                         op->status = nfserr_rep_too_big_to_cache;
4613                 else
4614                         op->status = nfserr_rep_too_big;
4615         }
4616         if (op->status == nfserr_resource ||
4617             op->status == nfserr_rep_too_big ||
4618             op->status == nfserr_rep_too_big_to_cache) {
4619                 /*
4620                  * The operation may have already been encoded or
4621                  * partially encoded.  No op returns anything additional
4622                  * in the case of one of these three errors, so we can
4623                  * just truncate back to after the status.  But it's a
4624                  * bug if we had to do this on a non-idempotent op:
4625                  */
4626                 warn_on_nonidempotent_op(op);
4627                 xdr_truncate_encode(xdr, post_err_offset);
4628         }
4629         if (so) {
4630                 int len = xdr->buf->len - post_err_offset;
4631
4632                 so->so_replay.rp_status = op->status;
4633                 so->so_replay.rp_buflen = len;
4634                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4635                                                 so->so_replay.rp_buf, len);
4636         }
4637 status:
4638         /* Note that op->status is already in network byte order: */
4639         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4640 }
4641
4642 /*
4643  * Encode the reply stored in the stateowner reply cache
4644  *
4645  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4646  * previously sent already encoded operation.
4647  */
4648 void
4649 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4650 {
4651         __be32 *p;
4652         struct nfs4_replay *rp = op->replay;
4653
4654         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4655         if (!p) {
4656                 WARN_ON_ONCE(1);
4657                 return;
4658         }
4659         *p++ = cpu_to_be32(op->opnum);
4660         *p++ = rp->rp_status;  /* already xdr'ed */
4661
4662         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4663 }
4664
4665 int
4666 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4667 {
4668         return xdr_ressize_check(rqstp, p);
4669 }
4670
4671 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4672 {
4673         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4674
4675         if (args->ops != args->iops) {
4676                 kfree(args->ops);
4677                 args->ops = args->iops;
4678         }
4679         kfree(args->tmpp);
4680         args->tmpp = NULL;
4681         while (args->to_free) {
4682                 struct svcxdr_tmpbuf *tb = args->to_free;
4683                 args->to_free = tb->next;
4684                 kfree(tb);
4685         }
4686 }
4687
4688 int
4689 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4690 {
4691         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4692
4693         if (rqstp->rq_arg.head[0].iov_len % 4) {
4694                 /* client is nuts */
4695                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4696                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4697                 return 0;
4698         }
4699         args->p = p;
4700         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4701         args->pagelist = rqstp->rq_arg.pages;
4702         args->pagelen = rqstp->rq_arg.page_len;
4703         args->tail = false;
4704         args->tmpp = NULL;
4705         args->to_free = NULL;
4706         args->ops = args->iops;
4707         args->rqstp = rqstp;
4708
4709         return !nfsd4_decode_compound(args);
4710 }
4711
4712 int
4713 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4714 {
4715         /*
4716          * All that remains is to write the tag and operation count...
4717          */
4718         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4719         struct xdr_buf *buf = resp->xdr.buf;
4720
4721         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4722                                  buf->tail[0].iov_len);
4723
4724         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4725
4726         p = resp->tagp;
4727         *p++ = htonl(resp->taglen);
4728         memcpy(p, resp->tag, resp->taglen);
4729         p += XDR_QUADLEN(resp->taglen);
4730         *p++ = htonl(resp->opcnt);
4731
4732         nfsd4_sequence_done(resp);
4733         return 1;
4734 }
4735
4736 /*
4737  * Local variables:
4738  *  c-basic-offset: 8
4739  * End:
4740  */