fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  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 #include <linux/xattr.h>
  45 #include <uapi/linux/xattr.h>
  46
  47 #include "idmap.h"
  48 #include "acl.h"
  49 #include "xdr4.h"
  50 #include "vfs.h"
  51 #include "state.h"
  52 #include "cache.h"
  53 #include "netns.h"
  54 #include "pnfs.h"
  55 #include "filecache.h"
  56
  57 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  58 #include <linux/security.h>
  59 #endif
  60
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 const u32 nfsd_suppattrs[3][3] = {
  65         {NFSD4_SUPPORTED_ATTRS_WORD0,
  66          NFSD4_SUPPORTED_ATTRS_WORD1,
  67          NFSD4_SUPPORTED_ATTRS_WORD2},
  68
  69         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  70          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  71          NFSD4_1_SUPPORTED_ATTRS_WORD2},
  72
  73         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  74          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  75          NFSD4_2_SUPPORTED_ATTRS_WORD2},
  76 };
  77
  78 /*
  79  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  80  * directory in order to indicate to the client that a filesystem boundary is present
  81  * We use a fixed fsid for a referral
  82  */
  83 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  84 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  85
  86 static __be32
  87 check_filename(char *str, int len)
  88 {
  89         int i;
  90
  91         if (len == 0)
  92                 return nfserr_inval;
  93         if (isdotent(str, len))
  94                 return nfserr_badname;
  95         for (i = 0; i < len; i++)
  96                 if (str[i] == '/')
  97                         return nfserr_badname;
  98         return 0;
  99 }
 100
 101 #define DECODE_HEAD                             \
 102         __be32 *p;                              \
 103         __be32 status
 104 #define DECODE_TAIL                             \
 105         status = 0;                             \
 106 out:                                            \
 107         return status;                          \
 108 xdr_error:                                      \
 109         dprintk("NFSD: xdr error (%s:%d)\n",    \
 110                         __FILE__, __LINE__);    \
 111         status = nfserr_bad_xdr;                \
 112         goto out
 113
 114 #define READMEM(x,nbytes) do {                  \
 115         x = (char *)p;                          \
 116         p += XDR_QUADLEN(nbytes);               \
 117 } while (0)
 118 #define SAVEMEM(x,nbytes) do {                  \
 119         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 120                 savemem(argp, p, nbytes) :      \
 121                 (char *)p)) {                   \
 122                 dprintk("NFSD: xdr error (%s:%d)\n", \
 123                                 __FILE__, __LINE__); \
 124                 goto xdr_error;                 \
 125                 }                               \
 126         p += XDR_QUADLEN(nbytes);               \
 127 } while (0)
 128 #define COPYMEM(x,nbytes) do {                  \
 129         memcpy((x), p, nbytes);                 \
 130         p += XDR_QUADLEN(nbytes);               \
 131 } while (0)
 132
 133 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 134 #define READ_BUF(nbytes)  do {                  \
 135         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 136                 p = argp->p;                    \
 137                 argp->p += XDR_QUADLEN(nbytes); \
 138         } else if (!(p = read_buf(argp, nbytes))) { \
 139                 dprintk("NFSD: xdr error (%s:%d)\n", \
 140                                 __FILE__, __LINE__); \
 141                 goto xdr_error;                 \
 142         }                                       \
 143 } while (0)
 144
 145 static void next_decode_page(struct nfsd4_compoundargs *argp)
 146 {
 147         argp->p = page_address(argp->pagelist[0]);
 148         argp->pagelist++;
 149         if (argp->pagelen < PAGE_SIZE) {
 150                 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
 151                 argp->pagelen = 0;
 152         } else {
 153                 argp->end = argp->p + (PAGE_SIZE>>2);
 154                 argp->pagelen -= PAGE_SIZE;
 155         }
 156 }
 157
 158 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 159 {
 160         /* We want more bytes than seem to be available.
 161          * Maybe we need a new page, maybe we have just run out
 162          */
 163         unsigned int avail = (char *)argp->end - (char *)argp->p;
 164         __be32 *p;
 165
 166         if (argp->pagelen == 0) {
 167                 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
 168
 169                 if (!argp->tail) {
 170                         argp->tail = true;
 171                         avail = vec->iov_len;
 172                         argp->p = vec->iov_base;
 173                         argp->end = vec->iov_base + avail;
 174                 }
 175
 176                 if (avail < nbytes)
 177                         return NULL;
 178
 179                 p = argp->p;
 180                 argp->p += XDR_QUADLEN(nbytes);
 181                 return p;
 182         }
 183
 184         if (avail + argp->pagelen < nbytes)
 185                 return NULL;
 186         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 187                 return NULL;
 188         /* ok, we can do it with the current plus the next page */
 189         if (nbytes <= sizeof(argp->tmp))
 190                 p = argp->tmp;
 191         else {
 192                 kfree(argp->tmpp);
 193                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 194                 if (!p)
 195                         return NULL;
 196
 197         }
 198         /*
 199          * The following memcpy is safe because read_buf is always
 200          * called with nbytes > avail, and the two cases above both
 201          * guarantee p points to at least nbytes bytes.
 202          */
 203         memcpy(p, argp->p, avail);
 204         next_decode_page(argp);
 205         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 206         argp->p += XDR_QUADLEN(nbytes - avail);
 207         return p;
 208 }
 209
 210 static unsigned int compoundargs_bytes_left(struct nfsd4_compoundargs *argp)
 211 {
 212         unsigned int this = (char *)argp->end - (char *)argp->p;
 213
 214         return this + argp->pagelen;
 215 }
 216
 217 static int zero_clientid(clientid_t *clid)
 218 {
 219         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 220 }
 221
 222 /**
 223  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 224  * @argp: NFSv4 compound argument structure
 225  * @len: length of buffer to allocate
 226  *
 227  * Allocates a buffer of size @len to be freed when processing the compound
 228  * operation described in @argp finishes.
 229  */
 230 static void *
 231 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 232 {
 233         struct svcxdr_tmpbuf *tb;
 234
 235         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 236         if (!tb)
 237                 return NULL;
 238         tb->next = argp->to_free;
 239         argp->to_free = tb;
 240         return tb->buf;
 241 }
 242
 243 /*
 244  * For xdr strings that need to be passed to other kernel api's
 245  * as null-terminated strings.
 246  *
 247  * Note null-terminating in place usually isn't safe since the
 248  * buffer might end on a page boundary.
 249  */
 250 static char *
 251 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 252 {
 253         char *p = svcxdr_tmpalloc(argp, len + 1);
 254
 255         if (!p)
 256                 return NULL;
 257         memcpy(p, buf, len);
 258         p[len] = '\0';
 259         return p;
 260 }
 261
 262 static __be32
 263 svcxdr_construct_vector(struct nfsd4_compoundargs *argp, struct kvec *head,
 264                         struct page ***pagelist, u32 buflen)
 265 {
 266         int avail;
 267         int len;
 268         int pages;
 269
 270         /* Sorry .. no magic macros for this.. *
 271          * READ_BUF(write->wr_buflen);
 272          * SAVEMEM(write->wr_buf, write->wr_buflen);
 273          */
 274         avail = (char *)argp->end - (char *)argp->p;
 275         if (avail + argp->pagelen < buflen) {
 276                 dprintk("NFSD: xdr error (%s:%d)\n",
 277                                __FILE__, __LINE__);
 278                 return nfserr_bad_xdr;
 279         }
 280         head->iov_base = argp->p;
 281         head->iov_len = avail;
 282         *pagelist = argp->pagelist;
 283
 284         len = XDR_QUADLEN(buflen) << 2;
 285         if (len >= avail) {
 286                 len -= avail;
 287
 288                 pages = len >> PAGE_SHIFT;
 289                 argp->pagelist += pages;
 290                 argp->pagelen -= pages * PAGE_SIZE;
 291                 len -= pages * PAGE_SIZE;
 292
 293                 next_decode_page(argp);
 294         }
 295         argp->p += XDR_QUADLEN(len);
 296
 297         return 0;
 298 }
 299
 300 /**
 301  * savemem - duplicate a chunk of memory for later processing
 302  * @argp: NFSv4 compound argument structure to be freed with
 303  * @p: pointer to be duplicated
 304  * @nbytes: length to be duplicated
 305  *
 306  * Returns a pointer to a copy of @nbytes bytes of memory at @p
 307  * that are preserved until processing of the NFSv4 compound
 308  * operation described by @argp finishes.
 309  */
 310 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 311 {
 312         void *ret;
 313
 314         ret = svcxdr_tmpalloc(argp, nbytes);
 315         if (!ret)
 316                 return NULL;
 317         memcpy(ret, p, nbytes);
 318         return ret;
 319 }
 320
 321 static __be32
 322 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
 323 {
 324         DECODE_HEAD;
 325
 326         READ_BUF(12);
 327         p = xdr_decode_hyper(p, &tv->tv_sec);
 328         tv->tv_nsec = be32_to_cpup(p++);
 329         if (tv->tv_nsec >= (u32)1000000000)
 330                 return nfserr_inval;
 331
 332         DECODE_TAIL;
 333 }
 334
 335 static __be32
 336 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 337 {
 338         u32 bmlen;
 339         DECODE_HEAD;
 340
 341         bmval[0] = 0;
 342         bmval[1] = 0;
 343         bmval[2] = 0;
 344
 345         READ_BUF(4);
 346         bmlen = be32_to_cpup(p++);
 347         if (bmlen > 1000)
 348                 goto xdr_error;
 349
 350         READ_BUF(bmlen << 2);
 351         if (bmlen > 0)
 352                 bmval[0] = be32_to_cpup(p++);
 353         if (bmlen > 1)
 354                 bmval[1] = be32_to_cpup(p++);
 355         if (bmlen > 2)
 356                 bmval[2] = be32_to_cpup(p++);
 357
 358         DECODE_TAIL;
 359 }
 360
 361 static __be32
 362 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 363                    struct iattr *iattr, struct nfs4_acl **acl,
 364                    struct xdr_netobj *label, int *umask)
 365 {
 366         int expected_len, len = 0;
 367         u32 dummy32;
 368         char *buf;
 369
 370         DECODE_HEAD;
 371         iattr->ia_valid = 0;
 372         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 373                 return status;
 374
 375         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 376             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 377             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
 378                 if (nfsd_attrs_supported(argp->minorversion, bmval))
 379                         return nfserr_inval;
 380                 return nfserr_attrnotsupp;
 381         }
 382
 383         READ_BUF(4);
 384         expected_len = be32_to_cpup(p++);
 385
 386         if (bmval[0] & FATTR4_WORD0_SIZE) {
 387                 READ_BUF(8);
 388                 len += 8;
 389                 p = xdr_decode_hyper(p, &iattr->ia_size);
 390                 iattr->ia_valid |= ATTR_SIZE;
 391         }
 392         if (bmval[0] & FATTR4_WORD0_ACL) {
 393                 u32 nace;
 394                 struct nfs4_ace *ace;
 395
 396                 READ_BUF(4); len += 4;
 397                 nace = be32_to_cpup(p++);
 398
 399                 if (nace > compoundargs_bytes_left(argp)/20)
 400                         /*
 401                          * Even with 4-byte names there wouldn't be
 402                          * space for that many aces; something fishy is
 403                          * going on:
 404                          */
 405                         return nfserr_fbig;
 406
 407                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
 408                 if (*acl == NULL)
 409                         return nfserr_jukebox;
 410
 411                 (*acl)->naces = nace;
 412                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 413                         READ_BUF(16); len += 16;
 414                         ace->type = be32_to_cpup(p++);
 415                         ace->flag = be32_to_cpup(p++);
 416                         ace->access_mask = be32_to_cpup(p++);
 417                         dummy32 = be32_to_cpup(p++);
 418                         READ_BUF(dummy32);
 419                         len += XDR_QUADLEN(dummy32) << 2;
 420                         READMEM(buf, dummy32);
 421                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 422                         status = nfs_ok;
 423                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 424                                 ;
 425                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 426                                 status = nfsd_map_name_to_gid(argp->rqstp,
 427                                                 buf, dummy32, &ace->who_gid);
 428                         else
 429                                 status = nfsd_map_name_to_uid(argp->rqstp,
 430                                                 buf, dummy32, &ace->who_uid);
 431                         if (status)
 432                                 return status;
 433                 }
 434         } else
 435                 *acl = NULL;
 436         if (bmval[1] & FATTR4_WORD1_MODE) {
 437                 READ_BUF(4);
 438                 len += 4;
 439                 iattr->ia_mode = be32_to_cpup(p++);
 440                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 441                 iattr->ia_valid |= ATTR_MODE;
 442         }
 443         if (bmval[1] & FATTR4_WORD1_OWNER) {
 444                 READ_BUF(4);
 445                 len += 4;
 446                 dummy32 = be32_to_cpup(p++);
 447                 READ_BUF(dummy32);
 448                 len += (XDR_QUADLEN(dummy32) << 2);
 449                 READMEM(buf, dummy32);
 450                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 451                         return status;
 452                 iattr->ia_valid |= ATTR_UID;
 453         }
 454         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 455                 READ_BUF(4);
 456                 len += 4;
 457                 dummy32 = be32_to_cpup(p++);
 458                 READ_BUF(dummy32);
 459                 len += (XDR_QUADLEN(dummy32) << 2);
 460                 READMEM(buf, dummy32);
 461                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 462                         return status;
 463                 iattr->ia_valid |= ATTR_GID;
 464         }
 465         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 466                 READ_BUF(4);
 467                 len += 4;
 468                 dummy32 = be32_to_cpup(p++);
 469                 switch (dummy32) {
 470                 case NFS4_SET_TO_CLIENT_TIME:
 471                         len += 12;
 472                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
 473                         if (status)
 474                                 return status;
 475                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 476                         break;
 477                 case NFS4_SET_TO_SERVER_TIME:
 478                         iattr->ia_valid |= ATTR_ATIME;
 479                         break;
 480                 default:
 481                         goto xdr_error;
 482                 }
 483         }
 484         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 485                 READ_BUF(4);
 486                 len += 4;
 487                 dummy32 = be32_to_cpup(p++);
 488                 switch (dummy32) {
 489                 case NFS4_SET_TO_CLIENT_TIME:
 490                         len += 12;
 491                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
 492                         if (status)
 493                                 return status;
 494                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 495                         break;
 496                 case NFS4_SET_TO_SERVER_TIME:
 497                         iattr->ia_valid |= ATTR_MTIME;
 498                         break;
 499                 default:
 500                         goto xdr_error;
 501                 }
 502         }
 503
 504         label->len = 0;
 505         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
 506             bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 507                 READ_BUF(4);
 508                 len += 4;
 509                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
 510                 READ_BUF(4);
 511                 len += 4;
 512                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
 513                 READ_BUF(4);
 514                 len += 4;
 515                 dummy32 = be32_to_cpup(p++);
 516                 READ_BUF(dummy32);
 517                 if (dummy32 > NFS4_MAXLABELLEN)
 518                         return nfserr_badlabel;
 519                 len += (XDR_QUADLEN(dummy32) << 2);
 520                 READMEM(buf, dummy32);
 521                 label->len = dummy32;
 522                 label->data = svcxdr_dupstr(argp, buf, dummy32);
 523                 if (!label->data)
 524                         return nfserr_jukebox;
 525         }
 526         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 527                 if (!umask)
 528                         goto xdr_error;
 529                 READ_BUF(8);
 530                 len += 8;
 531                 dummy32 = be32_to_cpup(p++);
 532                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
 533                 dummy32 = be32_to_cpup(p++);
 534                 *umask = dummy32 & S_IRWXUGO;
 535                 iattr->ia_valid |= ATTR_MODE;
 536         }
 537         if (len != expected_len)
 538                 goto xdr_error;
 539
 540         DECODE_TAIL;
 541 }
 542
 543 static __be32
 544 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 545 {
 546         DECODE_HEAD;
 547
 548         READ_BUF(sizeof(stateid_t));
 549         sid->si_generation = be32_to_cpup(p++);
 550         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 551
 552         DECODE_TAIL;
 553 }
 554
 555 static __be32
 556 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 557 {
 558         DECODE_HEAD;
 559
 560         READ_BUF(4);
 561         access->ac_req_access = be32_to_cpup(p++);
 562
 563         DECODE_TAIL;
 564 }
 565
 566 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 567 {
 568         DECODE_HEAD;
 569         struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
 570         u32 dummy, uid, gid;
 571         char *machine_name;
 572         int i;
 573         int nr_secflavs;
 574
 575         /* callback_sec_params4 */
 576         READ_BUF(4);
 577         nr_secflavs = be32_to_cpup(p++);
 578         if (nr_secflavs)
 579                 cbs->flavor = (u32)(-1);
 580         else
 581                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 582                 cbs->flavor = 0;
 583         for (i = 0; i < nr_secflavs; ++i) {
 584                 READ_BUF(4);
 585                 dummy = be32_to_cpup(p++);
 586                 switch (dummy) {
 587                 case RPC_AUTH_NULL:
 588                         /* Nothing to read */
 589                         if (cbs->flavor == (u32)(-1))
 590                                 cbs->flavor = RPC_AUTH_NULL;
 591                         break;
 592                 case RPC_AUTH_UNIX:
 593                         READ_BUF(8);
 594                         /* stamp */
 595                         dummy = be32_to_cpup(p++);
 596
 597                         /* machine name */
 598                         dummy = be32_to_cpup(p++);
 599                         READ_BUF(dummy);
 600                         SAVEMEM(machine_name, dummy);
 601
 602                         /* uid, gid */
 603                         READ_BUF(8);
 604                         uid = be32_to_cpup(p++);
 605                         gid = be32_to_cpup(p++);
 606
 607                         /* more gids */
 608                         READ_BUF(4);
 609                         dummy = be32_to_cpup(p++);
 610                         READ_BUF(dummy * 4);
 611                         if (cbs->flavor == (u32)(-1)) {
 612                                 kuid_t kuid = make_kuid(userns, uid);
 613                                 kgid_t kgid = make_kgid(userns, gid);
 614                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 615                                         cbs->uid = kuid;
 616                                         cbs->gid = kgid;
 617                                         cbs->flavor = RPC_AUTH_UNIX;
 618                                 } else {
 619                                         dprintk("RPC_AUTH_UNIX with invalid"
 620                                                 "uid or gid ignoring!\n");
 621                                 }
 622                         }
 623                         break;
 624                 case RPC_AUTH_GSS:
 625                         dprintk("RPC_AUTH_GSS callback secflavor "
 626                                 "not supported!\n");
 627                         READ_BUF(8);
 628                         /* gcbp_service */
 629                         dummy = be32_to_cpup(p++);
 630                         /* gcbp_handle_from_server */
 631                         dummy = be32_to_cpup(p++);
 632                         READ_BUF(dummy);
 633                         p += XDR_QUADLEN(dummy);
 634                         /* gcbp_handle_from_client */
 635                         READ_BUF(4);
 636                         dummy = be32_to_cpup(p++);
 637                         READ_BUF(dummy);
 638                         break;
 639                 default:
 640                         dprintk("Illegal callback secflavor\n");
 641                         return nfserr_inval;
 642                 }
 643         }
 644         DECODE_TAIL;
 645 }
 646
 647 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 648 {
 649         DECODE_HEAD;
 650
 651         READ_BUF(4);
 652         bc->bc_cb_program = be32_to_cpup(p++);
 653         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 654
 655         DECODE_TAIL;
 656 }
 657
 658 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 659 {
 660         DECODE_HEAD;
 661
 662         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 663         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 664         bcts->dir = be32_to_cpup(p++);
 665         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 666          * could help us figure out we should be using it. */
 667         DECODE_TAIL;
 668 }
 669
 670 static __be32
 671 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 672 {
 673         DECODE_HEAD;
 674
 675         READ_BUF(4);
 676         close->cl_seqid = be32_to_cpup(p++);
 677         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 678
 679         DECODE_TAIL;
 680 }
 681
 682
 683 static __be32
 684 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 685 {
 686         DECODE_HEAD;
 687
 688         READ_BUF(12);
 689         p = xdr_decode_hyper(p, &commit->co_offset);
 690         commit->co_count = be32_to_cpup(p++);
 691
 692         DECODE_TAIL;
 693 }
 694
 695 static __be32
 696 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 697 {
 698         DECODE_HEAD;
 699
 700         READ_BUF(4);
 701         create->cr_type = be32_to_cpup(p++);
 702         switch (create->cr_type) {
 703         case NF4LNK:
 704                 READ_BUF(4);
 705                 create->cr_datalen = be32_to_cpup(p++);
 706                 READ_BUF(create->cr_datalen);
 707                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 708                 if (!create->cr_data)
 709                         return nfserr_jukebox;
 710                 break;
 711         case NF4BLK:
 712         case NF4CHR:
 713                 READ_BUF(8);
 714                 create->cr_specdata1 = be32_to_cpup(p++);
 715                 create->cr_specdata2 = be32_to_cpup(p++);
 716                 break;
 717         case NF4SOCK:
 718         case NF4FIFO:
 719         case NF4DIR:
 720         default:
 721                 break;
 722         }
 723
 724         READ_BUF(4);
 725         create->cr_namelen = be32_to_cpup(p++);
 726         READ_BUF(create->cr_namelen);
 727         SAVEMEM(create->cr_name, create->cr_namelen);
 728         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 729                 return status;
 730
 731         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 732                                     &create->cr_acl, &create->cr_label,
 733                                     &create->cr_umask);
 734         if (status)
 735                 goto out;
 736
 737         DECODE_TAIL;
 738 }
 739
 740 static inline __be32
 741 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 742 {
 743         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 744 }
 745
 746 static inline __be32
 747 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 748 {
 749         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 750 }
 751
 752 static __be32
 753 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 754 {
 755         DECODE_HEAD;
 756
 757         READ_BUF(4);
 758         link->li_namelen = be32_to_cpup(p++);
 759         READ_BUF(link->li_namelen);
 760         SAVEMEM(link->li_name, link->li_namelen);
 761         if ((status = check_filename(link->li_name, link->li_namelen)))
 762                 return status;
 763
 764         DECODE_TAIL;
 765 }
 766
 767 static __be32
 768 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 769 {
 770         DECODE_HEAD;
 771
 772         /*
 773         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 774         */
 775         READ_BUF(28);
 776         lock->lk_type = be32_to_cpup(p++);
 777         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 778                 goto xdr_error;
 779         lock->lk_reclaim = be32_to_cpup(p++);
 780         p = xdr_decode_hyper(p, &lock->lk_offset);
 781         p = xdr_decode_hyper(p, &lock->lk_length);
 782         lock->lk_is_new = be32_to_cpup(p++);
 783
 784         if (lock->lk_is_new) {
 785                 READ_BUF(4);
 786                 lock->lk_new_open_seqid = be32_to_cpup(p++);
 787                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 788                 if (status)
 789                         return status;
 790                 READ_BUF(8 + sizeof(clientid_t));
 791                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
 792                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 793                 lock->lk_new_owner.len = be32_to_cpup(p++);
 794                 READ_BUF(lock->lk_new_owner.len);
 795                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 796         } else {
 797                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 798                 if (status)
 799                         return status;
 800                 READ_BUF(4);
 801                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
 802         }
 803
 804         DECODE_TAIL;
 805 }
 806
 807 static __be32
 808 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 809 {
 810         DECODE_HEAD;
 811
 812         READ_BUF(32);
 813         lockt->lt_type = be32_to_cpup(p++);
 814         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 815                 goto xdr_error;
 816         p = xdr_decode_hyper(p, &lockt->lt_offset);
 817         p = xdr_decode_hyper(p, &lockt->lt_length);
 818         COPYMEM(&lockt->lt_clientid, 8);
 819         lockt->lt_owner.len = be32_to_cpup(p++);
 820         READ_BUF(lockt->lt_owner.len);
 821         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 822
 823         DECODE_TAIL;
 824 }
 825
 826 static __be32
 827 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 828 {
 829         DECODE_HEAD;
 830
 831         READ_BUF(8);
 832         locku->lu_type = be32_to_cpup(p++);
 833         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 834                 goto xdr_error;
 835         locku->lu_seqid = be32_to_cpup(p++);
 836         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 837         if (status)
 838                 return status;
 839         READ_BUF(16);
 840         p = xdr_decode_hyper(p, &locku->lu_offset);
 841         p = xdr_decode_hyper(p, &locku->lu_length);
 842
 843         DECODE_TAIL;
 844 }
 845
 846 static __be32
 847 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 848 {
 849         DECODE_HEAD;
 850
 851         READ_BUF(4);
 852         lookup->lo_len = be32_to_cpup(p++);
 853         READ_BUF(lookup->lo_len);
 854         SAVEMEM(lookup->lo_name, lookup->lo_len);
 855         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 856                 return status;
 857
 858         DECODE_TAIL;
 859 }
 860
 861 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 862 {
 863         __be32 *p;
 864         u32 w;
 865
 866         READ_BUF(4);
 867         w = be32_to_cpup(p++);
 868         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 869         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 870         if (deleg_when)
 871                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 872
 873         switch (w & NFS4_SHARE_ACCESS_MASK) {
 874         case NFS4_SHARE_ACCESS_READ:
 875         case NFS4_SHARE_ACCESS_WRITE:
 876         case NFS4_SHARE_ACCESS_BOTH:
 877                 break;
 878         default:
 879                 return nfserr_bad_xdr;
 880         }
 881         w &= ~NFS4_SHARE_ACCESS_MASK;
 882         if (!w)
 883                 return nfs_ok;
 884         if (!argp->minorversion)
 885                 return nfserr_bad_xdr;
 886         switch (w & NFS4_SHARE_WANT_MASK) {
 887         case NFS4_SHARE_WANT_NO_PREFERENCE:
 888         case NFS4_SHARE_WANT_READ_DELEG:
 889         case NFS4_SHARE_WANT_WRITE_DELEG:
 890         case NFS4_SHARE_WANT_ANY_DELEG:
 891         case NFS4_SHARE_WANT_NO_DELEG:
 892         case NFS4_SHARE_WANT_CANCEL:
 893                 break;
 894         default:
 895                 return nfserr_bad_xdr;
 896         }
 897         w &= ~NFS4_SHARE_WANT_MASK;
 898         if (!w)
 899                 return nfs_ok;
 900
 901         if (!deleg_when)        /* open_downgrade */
 902                 return nfserr_inval;
 903         switch (w) {
 904         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 905         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 906         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 907               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 908                 return nfs_ok;
 909         }
 910 xdr_error:
 911         return nfserr_bad_xdr;
 912 }
 913
 914 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 915 {
 916         __be32 *p;
 917
 918         READ_BUF(4);
 919         *x = be32_to_cpup(p++);
 920         /* Note: unlinke access bits, deny bits may be zero. */
 921         if (*x & ~NFS4_SHARE_DENY_BOTH)
 922                 return nfserr_bad_xdr;
 923         return nfs_ok;
 924 xdr_error:
 925         return nfserr_bad_xdr;
 926 }
 927
 928 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 929 {
 930         __be32 *p;
 931
 932         READ_BUF(4);
 933         o->len = be32_to_cpup(p++);
 934
 935         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 936                 return nfserr_bad_xdr;
 937
 938         READ_BUF(o->len);
 939         SAVEMEM(o->data, o->len);
 940         return nfs_ok;
 941 xdr_error:
 942         return nfserr_bad_xdr;
 943 }
 944
 945 static __be32
 946 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 947 {
 948         DECODE_HEAD;
 949         u32 dummy;
 950
 951         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 952         open->op_iattr.ia_valid = 0;
 953         open->op_openowner = NULL;
 954
 955         open->op_xdr_error = 0;
 956         /* seqid, share_access, share_deny, clientid, ownerlen */
 957         READ_BUF(4);
 958         open->op_seqid = be32_to_cpup(p++);
 959         /* decode, yet ignore deleg_when until supported */
 960         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 961                                            &open->op_deleg_want, &dummy);
 962         if (status)
 963                 goto xdr_error;
 964         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 965         if (status)
 966                 goto xdr_error;
 967         READ_BUF(sizeof(clientid_t));
 968         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 969         status = nfsd4_decode_opaque(argp, &open->op_owner);
 970         if (status)
 971                 goto xdr_error;
 972         READ_BUF(4);
 973         open->op_create = be32_to_cpup(p++);
 974         switch (open->op_create) {
 975         case NFS4_OPEN_NOCREATE:
 976                 break;
 977         case NFS4_OPEN_CREATE:
 978                 READ_BUF(4);
 979                 open->op_createmode = be32_to_cpup(p++);
 980                 switch (open->op_createmode) {
 981                 case NFS4_CREATE_UNCHECKED:
 982                 case NFS4_CREATE_GUARDED:
 983                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 984                                 &open->op_iattr, &open->op_acl, &open->op_label,
 985                                 &open->op_umask);
 986                         if (status)
 987                                 goto out;
 988                         break;
 989                 case NFS4_CREATE_EXCLUSIVE:
 990                         READ_BUF(NFS4_VERIFIER_SIZE);
 991                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 992                         break;
 993                 case NFS4_CREATE_EXCLUSIVE4_1:
 994                         if (argp->minorversion < 1)
 995                                 goto xdr_error;
 996                         READ_BUF(NFS4_VERIFIER_SIZE);
 997                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 998                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 999                                 &open->op_iattr, &open->op_acl, &open->op_label,
1000                                 &open->op_umask);
1001                         if (status)
1002                                 goto out;
1003                         break;
1004                 default:
1005                         goto xdr_error;
1006                 }
1007                 break;
1008         default:
1009                 goto xdr_error;
1010         }
1011
1012         /* open_claim */
1013         READ_BUF(4);
1014         open->op_claim_type = be32_to_cpup(p++);
1015         switch (open->op_claim_type) {
1016         case NFS4_OPEN_CLAIM_NULL:
1017         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1018                 READ_BUF(4);
1019                 open->op_fname.len = be32_to_cpup(p++);
1020                 READ_BUF(open->op_fname.len);
1021                 SAVEMEM(open->op_fname.data, open->op_fname.len);
1022                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
1023                         return status;
1024                 break;
1025         case NFS4_OPEN_CLAIM_PREVIOUS:
1026                 READ_BUF(4);
1027                 open->op_delegate_type = be32_to_cpup(p++);
1028                 break;
1029         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1030                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1031                 if (status)
1032                         return status;
1033                 READ_BUF(4);
1034                 open->op_fname.len = be32_to_cpup(p++);
1035                 READ_BUF(open->op_fname.len);
1036                 SAVEMEM(open->op_fname.data, open->op_fname.len);
1037                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
1038                         return status;
1039                 break;
1040         case NFS4_OPEN_CLAIM_FH:
1041         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1042                 if (argp->minorversion < 1)
1043                         goto xdr_error;
1044                 /* void */
1045                 break;
1046         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1047                 if (argp->minorversion < 1)
1048                         goto xdr_error;
1049                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1050                 if (status)
1051                         return status;
1052                 break;
1053         default:
1054                 goto xdr_error;
1055         }
1056
1057         DECODE_TAIL;
1058 }
1059
1060 static __be32
1061 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1062 {
1063         DECODE_HEAD;
1064
1065         if (argp->minorversion >= 1)
1066                 return nfserr_notsupp;
1067
1068         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1069         if (status)
1070                 return status;
1071         READ_BUF(4);
1072         open_conf->oc_seqid = be32_to_cpup(p++);
1073
1074         DECODE_TAIL;
1075 }
1076
1077 static __be32
1078 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1079 {
1080         DECODE_HEAD;
1081
1082         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1083         if (status)
1084                 return status;
1085         READ_BUF(4);
1086         open_down->od_seqid = be32_to_cpup(p++);
1087         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1088                                            &open_down->od_deleg_want, NULL);
1089         if (status)
1090                 return status;
1091         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1092         if (status)
1093                 return status;
1094         DECODE_TAIL;
1095 }
1096
1097 static __be32
1098 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1099 {
1100         DECODE_HEAD;
1101
1102         READ_BUF(4);
1103         putfh->pf_fhlen = be32_to_cpup(p++);
1104         if (putfh->pf_fhlen > NFS4_FHSIZE)
1105                 goto xdr_error;
1106         READ_BUF(putfh->pf_fhlen);
1107         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1108
1109         DECODE_TAIL;
1110 }
1111
1112 static __be32
1113 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1114 {
1115         if (argp->minorversion == 0)
1116                 return nfs_ok;
1117         return nfserr_notsupp;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1122 {
1123         DECODE_HEAD;
1124
1125         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1126         if (status)
1127                 return status;
1128         READ_BUF(12);
1129         p = xdr_decode_hyper(p, &read->rd_offset);
1130         read->rd_length = be32_to_cpup(p++);
1131
1132         DECODE_TAIL;
1133 }
1134
1135 static __be32
1136 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1137 {
1138         DECODE_HEAD;
1139
1140         READ_BUF(24);
1141         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1142         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1143         readdir->rd_dircount = be32_to_cpup(p++);
1144         readdir->rd_maxcount = be32_to_cpup(p++);
1145         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1146                 goto out;
1147
1148         DECODE_TAIL;
1149 }
1150
1151 static __be32
1152 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1153 {
1154         DECODE_HEAD;
1155
1156         READ_BUF(4);
1157         remove->rm_namelen = be32_to_cpup(p++);
1158         READ_BUF(remove->rm_namelen);
1159         SAVEMEM(remove->rm_name, remove->rm_namelen);
1160         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1161                 return status;
1162
1163         DECODE_TAIL;
1164 }
1165
1166 static __be32
1167 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1168 {
1169         DECODE_HEAD;
1170
1171         READ_BUF(4);
1172         rename->rn_snamelen = be32_to_cpup(p++);
1173         READ_BUF(rename->rn_snamelen);
1174         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1175         READ_BUF(4);
1176         rename->rn_tnamelen = be32_to_cpup(p++);
1177         READ_BUF(rename->rn_tnamelen);
1178         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1179         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1180                 return status;
1181         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1182                 return status;
1183
1184         DECODE_TAIL;
1185 }
1186
1187 static __be32
1188 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1189 {
1190         DECODE_HEAD;
1191
1192         if (argp->minorversion >= 1)
1193                 return nfserr_notsupp;
1194
1195         READ_BUF(sizeof(clientid_t));
1196         COPYMEM(clientid, sizeof(clientid_t));
1197
1198         DECODE_TAIL;
1199 }
1200
1201 static __be32
1202 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1203                      struct nfsd4_secinfo *secinfo)
1204 {
1205         DECODE_HEAD;
1206
1207         READ_BUF(4);
1208         secinfo->si_namelen = be32_to_cpup(p++);
1209         READ_BUF(secinfo->si_namelen);
1210         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1211         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1212         if (status)
1213                 return status;
1214         DECODE_TAIL;
1215 }
1216
1217 static __be32
1218 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1219                      struct nfsd4_secinfo_no_name *sin)
1220 {
1221         DECODE_HEAD;
1222
1223         READ_BUF(4);
1224         sin->sin_style = be32_to_cpup(p++);
1225         DECODE_TAIL;
1226 }
1227
1228 static __be32
1229 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1230 {
1231         __be32 status;
1232
1233         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1234         if (status)
1235                 return status;
1236         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1237                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1238 }
1239
1240 static __be32
1241 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1242 {
1243         DECODE_HEAD;
1244
1245         if (argp->minorversion >= 1)
1246                 return nfserr_notsupp;
1247
1248         READ_BUF(NFS4_VERIFIER_SIZE);
1249         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1250
1251         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1252         if (status)
1253                 return nfserr_bad_xdr;
1254         READ_BUF(8);
1255         setclientid->se_callback_prog = be32_to_cpup(p++);
1256         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1257         READ_BUF(setclientid->se_callback_netid_len);
1258         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1259         READ_BUF(4);
1260         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1261
1262         READ_BUF(setclientid->se_callback_addr_len);
1263         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1264         READ_BUF(4);
1265         setclientid->se_callback_ident = be32_to_cpup(p++);
1266
1267         DECODE_TAIL;
1268 }
1269
1270 static __be32
1271 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1272 {
1273         DECODE_HEAD;
1274
1275         if (argp->minorversion >= 1)
1276                 return nfserr_notsupp;
1277
1278         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1279         COPYMEM(&scd_c->sc_clientid, 8);
1280         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1281
1282         DECODE_TAIL;
1283 }
1284
1285 /* Also used for NVERIFY */
1286 static __be32
1287 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1288 {
1289         DECODE_HEAD;
1290
1291         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1292                 goto out;
1293
1294         /* For convenience's sake, we compare raw xdr'd attributes in
1295          * nfsd4_proc_verify */
1296
1297         READ_BUF(4);
1298         verify->ve_attrlen = be32_to_cpup(p++);
1299         READ_BUF(verify->ve_attrlen);
1300         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1301
1302         DECODE_TAIL;
1303 }
1304
1305 static __be32
1306 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1307 {
1308         DECODE_HEAD;
1309
1310         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1311         if (status)
1312                 return status;
1313         READ_BUF(16);
1314         p = xdr_decode_hyper(p, &write->wr_offset);
1315         write->wr_stable_how = be32_to_cpup(p++);
1316         if (write->wr_stable_how > NFS_FILE_SYNC)
1317                 goto xdr_error;
1318         write->wr_buflen = be32_to_cpup(p++);
1319
1320         status = svcxdr_construct_vector(argp, &write->wr_head,
1321                                          &write->wr_pagelist, write->wr_buflen);
1322         if (status)
1323                 return status;
1324
1325         DECODE_TAIL;
1326 }
1327
1328 static __be32
1329 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1330 {
1331         DECODE_HEAD;
1332
1333         if (argp->minorversion >= 1)
1334                 return nfserr_notsupp;
1335
1336         READ_BUF(12);
1337         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1338         rlockowner->rl_owner.len = be32_to_cpup(p++);
1339         READ_BUF(rlockowner->rl_owner.len);
1340         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1341
1342         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1343                 return nfserr_inval;
1344         DECODE_TAIL;
1345 }
1346
1347 static __be32
1348 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1349                          struct nfsd4_exchange_id *exid)
1350 {
1351         int dummy, tmp;
1352         DECODE_HEAD;
1353
1354         READ_BUF(NFS4_VERIFIER_SIZE);
1355         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1356
1357         status = nfsd4_decode_opaque(argp, &exid->clname);
1358         if (status)
1359                 return nfserr_bad_xdr;
1360
1361         READ_BUF(4);
1362         exid->flags = be32_to_cpup(p++);
1363
1364         /* Ignore state_protect4_a */
1365         READ_BUF(4);
1366         exid->spa_how = be32_to_cpup(p++);
1367         switch (exid->spa_how) {
1368         case SP4_NONE:
1369                 break;
1370         case SP4_MACH_CRED:
1371                 /* spo_must_enforce */
1372                 status = nfsd4_decode_bitmap(argp,
1373                                         exid->spo_must_enforce);
1374                 if (status)
1375                         goto out;
1376                 /* spo_must_allow */
1377                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1378                 if (status)
1379                         goto out;
1380                 break;
1381         case SP4_SSV:
1382                 /* ssp_ops */
1383                 READ_BUF(4);
1384                 dummy = be32_to_cpup(p++);
1385                 READ_BUF(dummy * 4);
1386                 p += dummy;
1387
1388                 READ_BUF(4);
1389                 dummy = be32_to_cpup(p++);
1390                 READ_BUF(dummy * 4);
1391                 p += dummy;
1392
1393                 /* ssp_hash_algs<> */
1394                 READ_BUF(4);
1395                 tmp = be32_to_cpup(p++);
1396                 while (tmp--) {
1397                         READ_BUF(4);
1398                         dummy = be32_to_cpup(p++);
1399                         READ_BUF(dummy);
1400                         p += XDR_QUADLEN(dummy);
1401                 }
1402
1403                 /* ssp_encr_algs<> */
1404                 READ_BUF(4);
1405                 tmp = be32_to_cpup(p++);
1406                 while (tmp--) {
1407                         READ_BUF(4);
1408                         dummy = be32_to_cpup(p++);
1409                         READ_BUF(dummy);
1410                         p += XDR_QUADLEN(dummy);
1411                 }
1412
1413                 /* ignore ssp_window and ssp_num_gss_handles: */
1414                 READ_BUF(8);
1415                 break;
1416         default:
1417                 goto xdr_error;
1418         }
1419
1420         READ_BUF(4);    /* nfs_impl_id4 array length */
1421         dummy = be32_to_cpup(p++);
1422
1423         if (dummy > 1)
1424                 goto xdr_error;
1425
1426         if (dummy == 1) {
1427                 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1428                 if (status)
1429                         goto xdr_error;
1430
1431                 /* nii_name */
1432                 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1433                 if (status)
1434                         goto xdr_error;
1435
1436                 /* nii_date */
1437                 status = nfsd4_decode_time(argp, &exid->nii_time);
1438                 if (status)
1439                         goto xdr_error;
1440         }
1441         DECODE_TAIL;
1442 }
1443
1444 static __be32
1445 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1446                             struct nfsd4_create_session *sess)
1447 {
1448         DECODE_HEAD;
1449
1450         READ_BUF(16);
1451         COPYMEM(&sess->clientid, 8);
1452         sess->seqid = be32_to_cpup(p++);
1453         sess->flags = be32_to_cpup(p++);
1454
1455         /* Fore channel attrs */
1456         READ_BUF(28);
1457         p++; /* headerpadsz is always 0 */
1458         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1459         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1460         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1461         sess->fore_channel.maxops = be32_to_cpup(p++);
1462         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1463         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1464         if (sess->fore_channel.nr_rdma_attrs == 1) {
1465                 READ_BUF(4);
1466                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1467         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1468                 dprintk("Too many fore channel attr bitmaps!\n");
1469                 goto xdr_error;
1470         }
1471
1472         /* Back channel attrs */
1473         READ_BUF(28);
1474         p++; /* headerpadsz is always 0 */
1475         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1476         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1477         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1478         sess->back_channel.maxops = be32_to_cpup(p++);
1479         sess->back_channel.maxreqs = be32_to_cpup(p++);
1480         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1481         if (sess->back_channel.nr_rdma_attrs == 1) {
1482                 READ_BUF(4);
1483                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1484         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1485                 dprintk("Too many back channel attr bitmaps!\n");
1486                 goto xdr_error;
1487         }
1488
1489         READ_BUF(4);
1490         sess->callback_prog = be32_to_cpup(p++);
1491         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1492         DECODE_TAIL;
1493 }
1494
1495 static __be32
1496 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1497                              struct nfsd4_destroy_session *destroy_session)
1498 {
1499         DECODE_HEAD;
1500         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1501         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1502
1503         DECODE_TAIL;
1504 }
1505
1506 static __be32
1507 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1508                           struct nfsd4_free_stateid *free_stateid)
1509 {
1510         DECODE_HEAD;
1511
1512         READ_BUF(sizeof(stateid_t));
1513         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1514         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1515
1516         DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1521                       struct nfsd4_sequence *seq)
1522 {
1523         DECODE_HEAD;
1524
1525         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1526         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1527         seq->seqid = be32_to_cpup(p++);
1528         seq->slotid = be32_to_cpup(p++);
1529         seq->maxslots = be32_to_cpup(p++);
1530         seq->cachethis = be32_to_cpup(p++);
1531
1532         DECODE_TAIL;
1533 }
1534
1535 static __be32
1536 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1537 {
1538         int i;
1539         __be32 *p, status;
1540         struct nfsd4_test_stateid_id *stateid;
1541
1542         READ_BUF(4);
1543         test_stateid->ts_num_ids = ntohl(*p++);
1544
1545         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1546
1547         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1548                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1549                 if (!stateid) {
1550                         status = nfserrno(-ENOMEM);
1551                         goto out;
1552                 }
1553
1554                 INIT_LIST_HEAD(&stateid->ts_id_list);
1555                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1556
1557                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1558                 if (status)
1559                         goto out;
1560         }
1561
1562         status = 0;
1563 out:
1564         return status;
1565 xdr_error:
1566         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1567         status = nfserr_bad_xdr;
1568         goto out;
1569 }
1570
1571 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1572 {
1573         DECODE_HEAD;
1574
1575         READ_BUF(8);
1576         COPYMEM(&dc->clientid, 8);
1577
1578         DECODE_TAIL;
1579 }
1580
1581 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1582 {
1583         DECODE_HEAD;
1584
1585         READ_BUF(4);
1586         rc->rca_one_fs = be32_to_cpup(p++);
1587
1588         DECODE_TAIL;
1589 }
1590
1591 #ifdef CONFIG_NFSD_PNFS
1592 static __be32
1593 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1594                 struct nfsd4_getdeviceinfo *gdev)
1595 {
1596         DECODE_HEAD;
1597         u32 num, i;
1598
1599         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1600         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1601         gdev->gd_layout_type = be32_to_cpup(p++);
1602         gdev->gd_maxcount = be32_to_cpup(p++);
1603         num = be32_to_cpup(p++);
1604         if (num) {
1605                 if (num > 1000)
1606                         goto xdr_error;
1607                 READ_BUF(4 * num);
1608                 gdev->gd_notify_types = be32_to_cpup(p++);
1609                 for (i = 1; i < num; i++) {
1610                         if (be32_to_cpup(p++)) {
1611                                 status = nfserr_inval;
1612                                 goto out;
1613                         }
1614                 }
1615         }
1616         DECODE_TAIL;
1617 }
1618
1619 static __be32
1620 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1621                 struct nfsd4_layoutget *lgp)
1622 {
1623         DECODE_HEAD;
1624
1625         READ_BUF(36);
1626         lgp->lg_signal = be32_to_cpup(p++);
1627         lgp->lg_layout_type = be32_to_cpup(p++);
1628         lgp->lg_seg.iomode = be32_to_cpup(p++);
1629         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1630         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1631         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1632
1633         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1634         if (status)
1635                 return status;
1636
1637         READ_BUF(4);
1638         lgp->lg_maxcount = be32_to_cpup(p++);
1639
1640         DECODE_TAIL;
1641 }
1642
1643 static __be32
1644 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1645                 struct nfsd4_layoutcommit *lcp)
1646 {
1647         DECODE_HEAD;
1648         u32 timechange;
1649
1650         READ_BUF(20);
1651         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1652         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1653         lcp->lc_reclaim = be32_to_cpup(p++);
1654
1655         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1656         if (status)
1657                 return status;
1658
1659         READ_BUF(4);
1660         lcp->lc_newoffset = be32_to_cpup(p++);
1661         if (lcp->lc_newoffset) {
1662                 READ_BUF(8);
1663                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1664         } else
1665                 lcp->lc_last_wr = 0;
1666         READ_BUF(4);
1667         timechange = be32_to_cpup(p++);
1668         if (timechange) {
1669                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1670                 if (status)
1671                         return status;
1672         } else {
1673                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1674         }
1675         READ_BUF(8);
1676         lcp->lc_layout_type = be32_to_cpup(p++);
1677
1678         /*
1679          * Save the layout update in XDR format and let the layout driver deal
1680          * with it later.
1681          */
1682         lcp->lc_up_len = be32_to_cpup(p++);
1683         if (lcp->lc_up_len > 0) {
1684                 READ_BUF(lcp->lc_up_len);
1685                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1686         }
1687
1688         DECODE_TAIL;
1689 }
1690
1691 static __be32
1692 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1693                 struct nfsd4_layoutreturn *lrp)
1694 {
1695         DECODE_HEAD;
1696
1697         READ_BUF(16);
1698         lrp->lr_reclaim = be32_to_cpup(p++);
1699         lrp->lr_layout_type = be32_to_cpup(p++);
1700         lrp->lr_seg.iomode = be32_to_cpup(p++);
1701         lrp->lr_return_type = be32_to_cpup(p++);
1702         if (lrp->lr_return_type == RETURN_FILE) {
1703                 READ_BUF(16);
1704                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1705                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1706
1707                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1708                 if (status)
1709                         return status;
1710
1711                 READ_BUF(4);
1712                 lrp->lrf_body_len = be32_to_cpup(p++);
1713                 if (lrp->lrf_body_len > 0) {
1714                         READ_BUF(lrp->lrf_body_len);
1715                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1716                 }
1717         } else {
1718                 lrp->lr_seg.offset = 0;
1719                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1720         }
1721
1722         DECODE_TAIL;
1723 }
1724 #endif /* CONFIG_NFSD_PNFS */
1725
1726 static __be32
1727 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1728                        struct nfsd4_fallocate *fallocate)
1729 {
1730         DECODE_HEAD;
1731
1732         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1733         if (status)
1734                 return status;
1735
1736         READ_BUF(16);
1737         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1738         xdr_decode_hyper(p, &fallocate->falloc_length);
1739
1740         DECODE_TAIL;
1741 }
1742
1743 static __be32
1744 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1745 {
1746         DECODE_HEAD;
1747
1748         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1749         if (status)
1750                 return status;
1751         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1752         if (status)
1753                 return status;
1754
1755         READ_BUF(8 + 8 + 8);
1756         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1757         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1758         p = xdr_decode_hyper(p, &clone->cl_count);
1759         DECODE_TAIL;
1760 }
1761
1762 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1763                                       struct nl4_server *ns)
1764 {
1765         DECODE_HEAD;
1766         struct nfs42_netaddr *naddr;
1767
1768         READ_BUF(4);
1769         ns->nl4_type = be32_to_cpup(p++);
1770
1771         /* currently support for 1 inter-server source server */
1772         switch (ns->nl4_type) {
1773         case NL4_NETADDR:
1774                 naddr = &ns->u.nl4_addr;
1775
1776                 READ_BUF(4);
1777                 naddr->netid_len = be32_to_cpup(p++);
1778                 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1779                         goto xdr_error;
1780
1781                 READ_BUF(naddr->netid_len + 4); /* 4 for uaddr len */
1782                 COPYMEM(naddr->netid, naddr->netid_len);
1783
1784                 naddr->addr_len = be32_to_cpup(p++);
1785                 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1786                         goto xdr_error;
1787
1788                 READ_BUF(naddr->addr_len);
1789                 COPYMEM(naddr->addr, naddr->addr_len);
1790                 break;
1791         default:
1792                 goto xdr_error;
1793         }
1794         DECODE_TAIL;
1795 }
1796
1797 static __be32
1798 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1799 {
1800         DECODE_HEAD;
1801         struct nl4_server *ns_dummy;
1802         int i, count;
1803
1804         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1805         if (status)
1806                 return status;
1807         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1808         if (status)
1809                 return status;
1810
1811         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1812         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1813         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1814         p = xdr_decode_hyper(p, &copy->cp_count);
1815         p++; /* ca_consecutive: we always do consecutive copies */
1816         copy->cp_synchronous = be32_to_cpup(p++);
1817
1818         count = be32_to_cpup(p++);
1819
1820         copy->cp_intra = false;
1821         if (count == 0) { /* intra-server copy */
1822                 copy->cp_intra = true;
1823                 goto intra;
1824         }
1825
1826         /* decode all the supplied server addresses but use first */
1827         status = nfsd4_decode_nl4_server(argp, &copy->cp_src);
1828         if (status)
1829                 return status;
1830
1831         ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
1832         if (ns_dummy == NULL)
1833                 return nfserrno(-ENOMEM);
1834         for (i = 0; i < count - 1; i++) {
1835                 status = nfsd4_decode_nl4_server(argp, ns_dummy);
1836                 if (status) {
1837                         kfree(ns_dummy);
1838                         return status;
1839                 }
1840         }
1841         kfree(ns_dummy);
1842 intra:
1843
1844         DECODE_TAIL;
1845 }
1846
1847 static __be32
1848 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
1849                             struct nfsd4_offload_status *os)
1850 {
1851         return nfsd4_decode_stateid(argp, &os->stateid);
1852 }
1853
1854 static __be32
1855 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
1856                          struct nfsd4_copy_notify *cn)
1857 {
1858         __be32 status;
1859
1860         status = nfsd4_decode_stateid(argp, &cn->cpn_src_stateid);
1861         if (status)
1862                 return status;
1863         return nfsd4_decode_nl4_server(argp, &cn->cpn_dst);
1864 }
1865
1866 static __be32
1867 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1868 {
1869         DECODE_HEAD;
1870
1871         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1872         if (status)
1873                 return status;
1874
1875         READ_BUF(8 + 4);
1876         p = xdr_decode_hyper(p, &seek->seek_offset);
1877         seek->seek_whence = be32_to_cpup(p);
1878
1879         DECODE_TAIL;
1880 }
1881
1882 /*
1883  * XDR data that is more than PAGE_SIZE in size is normally part of a
1884  * read or write. However, the size of extended attributes is limited
1885  * by the maximum request size, and then further limited by the underlying
1886  * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
1887  * is 64k). Since there is no kvec- or page-based interface to xattrs,
1888  * and we're not dealing with contiguous pages, we need to do some copying.
1889  */
1890
1891 /*
1892  * Decode data into buffer. Uses head and pages constructed by
1893  * svcxdr_construct_vector.
1894  */
1895 static __be32
1896 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct kvec *head,
1897                        struct page **pages, char **bufp, u32 buflen)
1898 {
1899         char *tmp, *dp;
1900         u32 len;
1901
1902         if (buflen <= head->iov_len) {
1903                 /*
1904                  * We're in luck, the head has enough space. Just return
1905                  * the head, no need for copying.
1906                  */
1907                 *bufp = head->iov_base;
1908                 return 0;
1909         }
1910
1911         tmp = svcxdr_tmpalloc(argp, buflen);
1912         if (tmp == NULL)
1913                 return nfserr_jukebox;
1914
1915         dp = tmp;
1916         memcpy(dp, head->iov_base, head->iov_len);
1917         buflen -= head->iov_len;
1918         dp += head->iov_len;
1919
1920         while (buflen > 0) {
1921                 len = min_t(u32, buflen, PAGE_SIZE);
1922                 memcpy(dp, page_address(*pages), len);
1923
1924                 buflen -= len;
1925                 dp += len;
1926                 pages++;
1927         }
1928
1929         *bufp = tmp;
1930         return 0;
1931 }
1932
1933 /*
1934  * Get a user extended attribute name from the XDR buffer.
1935  * It will not have the "user." prefix, so prepend it.
1936  * Lastly, check for nul characters in the name.
1937  */
1938 static __be32
1939 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
1940 {
1941         DECODE_HEAD;
1942         char *name, *sp, *dp;
1943         u32 namelen, cnt;
1944
1945         READ_BUF(4);
1946         namelen = be32_to_cpup(p++);
1947
1948         if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
1949                 return nfserr_nametoolong;
1950
1951         if (namelen == 0)
1952                 goto xdr_error;
1953
1954         READ_BUF(namelen);
1955
1956         name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
1957         if (!name)
1958                 return nfserr_jukebox;
1959
1960         memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
1961
1962         /*
1963          * Copy the extended attribute name over while checking for 0
1964          * characters.
1965          */
1966         sp = (char *)p;
1967         dp = name + XATTR_USER_PREFIX_LEN;
1968         cnt = namelen;
1969
1970         while (cnt-- > 0) {
1971                 if (*sp == '\0')
1972                         goto xdr_error;
1973                 *dp++ = *sp++;
1974         }
1975         *dp = '\0';
1976
1977         *namep = name;
1978
1979         DECODE_TAIL;
1980 }
1981
1982 /*
1983  * A GETXATTR op request comes without a length specifier. We just set the
1984  * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
1985  * channel reply size. nfsd_getxattr will probe the length of the xattr,
1986  * check it against getxa_len, and allocate + return the value.
1987  */
1988 static __be32
1989 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
1990                       struct nfsd4_getxattr *getxattr)
1991 {
1992         __be32 status;
1993         u32 maxcount;
1994
1995         status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
1996         if (status)
1997                 return status;
1998
1999         maxcount = svc_max_payload(argp->rqstp);
2000         maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2001
2002         getxattr->getxa_len = maxcount;
2003
2004         return status;
2005 }
2006
2007 static __be32
2008 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2009                       struct nfsd4_setxattr *setxattr)
2010 {
2011         DECODE_HEAD;
2012         u32 flags, maxcount, size;
2013         struct kvec head;
2014         struct page **pagelist;
2015
2016         READ_BUF(4);
2017         flags = be32_to_cpup(p++);
2018
2019         if (flags > SETXATTR4_REPLACE)
2020                 return nfserr_inval;
2021         setxattr->setxa_flags = flags;
2022
2023         status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2024         if (status)
2025                 return status;
2026
2027         maxcount = svc_max_payload(argp->rqstp);
2028         maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2029
2030         READ_BUF(4);
2031         size = be32_to_cpup(p++);
2032         if (size > maxcount)
2033                 return nfserr_xattr2big;
2034
2035         setxattr->setxa_len = size;
2036         if (size > 0) {
2037                 status = svcxdr_construct_vector(argp, &head, &pagelist, size);
2038                 if (status)
2039                         return status;
2040
2041                 status = nfsd4_vbuf_from_vector(argp, &head, pagelist,
2042                     &setxattr->setxa_buf, size);
2043         }
2044
2045         DECODE_TAIL;
2046 }
2047
2048 static __be32
2049 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2050                         struct nfsd4_listxattrs *listxattrs)
2051 {
2052         DECODE_HEAD;
2053         u32 maxcount;
2054
2055         READ_BUF(12);
2056         p = xdr_decode_hyper(p, &listxattrs->lsxa_cookie);
2057
2058         /*
2059          * If the cookie  is too large to have even one user.x attribute
2060          * plus trailing '\0' left in a maximum size buffer, it's invalid.
2061          */
2062         if (listxattrs->lsxa_cookie >=
2063             (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2064                 return nfserr_badcookie;
2065
2066         maxcount = be32_to_cpup(p++);
2067         if (maxcount < 8)
2068                 /* Always need at least 2 words (length and one character) */
2069                 return nfserr_inval;
2070
2071         maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2072         listxattrs->lsxa_maxcount = maxcount;
2073
2074         DECODE_TAIL;
2075 }
2076
2077 static __be32
2078 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2079                          struct nfsd4_removexattr *removexattr)
2080 {
2081         return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2082 }
2083
2084 static __be32
2085 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
2086 {
2087         return nfs_ok;
2088 }
2089
2090 static __be32
2091 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
2092 {
2093         return nfserr_notsupp;
2094 }
2095
2096 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
2097
2098 static const nfsd4_dec nfsd4_dec_ops[] = {
2099         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
2100         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
2101         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
2102         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
2103         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
2104         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
2105         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
2106         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
2107         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
2108         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
2109         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
2110         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
2111         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
2112         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
2113         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
2114         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
2115         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
2116         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
2117         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
2118         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
2119         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
2120         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
2121         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
2122         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
2123         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
2124         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
2125         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
2126         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
2127         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
2128         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
2129         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
2130         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
2131         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
2132         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
2133         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
2134         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
2135         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
2136
2137         /* new operations for NFSv4.1 */
2138         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
2139         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
2140         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
2141         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
2142         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
2143         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
2144         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
2145 #ifdef CONFIG_NFSD_PNFS
2146         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
2147         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
2148         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
2149         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
2150         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
2151 #else
2152         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
2153         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
2154         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
2155         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
2156         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
2157 #endif
2158         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
2159         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
2160         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
2161         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
2162         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
2163         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
2164         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
2165
2166         /* new operations for NFSv4.2 */
2167         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
2168         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
2169         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_copy_notify,
2170         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
2171         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
2172         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
2173         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
2174         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_offload_status,
2175         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_offload_status,
2176         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_read,
2177         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
2178         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
2179         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
2180         /* RFC 8276 extended atributes operations */
2181         [OP_GETXATTR]           = (nfsd4_dec)nfsd4_decode_getxattr,
2182         [OP_SETXATTR]           = (nfsd4_dec)nfsd4_decode_setxattr,
2183         [OP_LISTXATTRS]         = (nfsd4_dec)nfsd4_decode_listxattrs,
2184         [OP_REMOVEXATTR]        = (nfsd4_dec)nfsd4_decode_removexattr,
2185 };
2186
2187 static inline bool
2188 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2189 {
2190         if (op->opnum < FIRST_NFS4_OP)
2191                 return false;
2192         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2193                 return false;
2194         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2195                 return false;
2196         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2197                 return false;
2198         return true;
2199 }
2200
2201 static __be32
2202 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2203 {
2204         DECODE_HEAD;
2205         struct nfsd4_op *op;
2206         bool cachethis = false;
2207         int auth_slack= argp->rqstp->rq_auth_slack;
2208         int max_reply = auth_slack + 8; /* opcnt, status */
2209         int readcount = 0;
2210         int readbytes = 0;
2211         int i;
2212
2213         READ_BUF(4);
2214         argp->taglen = be32_to_cpup(p++);
2215         READ_BUF(argp->taglen);
2216         SAVEMEM(argp->tag, argp->taglen);
2217         READ_BUF(8);
2218         argp->minorversion = be32_to_cpup(p++);
2219         argp->opcnt = be32_to_cpup(p++);
2220         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
2221
2222         if (argp->taglen > NFSD4_MAX_TAGLEN)
2223                 goto xdr_error;
2224         /*
2225          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
2226          * here, so we return success at the xdr level so that
2227          * nfsd4_proc can handle this is an NFS-level error.
2228          */
2229         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2230                 return 0;
2231
2232         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2233                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
2234                 if (!argp->ops) {
2235                         argp->ops = argp->iops;
2236                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
2237                         goto xdr_error;
2238                 }
2239         }
2240
2241         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2242                 argp->opcnt = 0;
2243
2244         for (i = 0; i < argp->opcnt; i++) {
2245                 op = &argp->ops[i];
2246                 op->replay = NULL;
2247
2248                 READ_BUF(4);
2249                 op->opnum = be32_to_cpup(p++);
2250
2251                 if (nfsd4_opnum_in_range(argp, op))
2252                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2253                 else {
2254                         op->opnum = OP_ILLEGAL;
2255                         op->status = nfserr_op_illegal;
2256                 }
2257                 op->opdesc = OPDESC(op);
2258                 /*
2259                  * We'll try to cache the result in the DRC if any one
2260                  * op in the compound wants to be cached:
2261                  */
2262                 cachethis |= nfsd4_cache_this_op(op);
2263
2264                 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2265                         readcount++;
2266                         readbytes += nfsd4_max_reply(argp->rqstp, op);
2267                 } else
2268                         max_reply += nfsd4_max_reply(argp->rqstp, op);
2269                 /*
2270                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
2271                  * (Special case because it will just skip encoding this
2272                  * if it runs out of xdr buffer space, and it is the only
2273                  * operation that behaves this way.)
2274                  */
2275                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2276                         max_reply += NFS4_OPAQUE_LIMIT;
2277
2278                 if (op->status) {
2279                         argp->opcnt = i+1;
2280                         break;
2281                 }
2282         }
2283         /* Sessions make the DRC unnecessary: */
2284         if (argp->minorversion)
2285                 cachethis = false;
2286         svc_reserve(argp->rqstp, max_reply + readbytes);
2287         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2288
2289         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2290                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2291
2292         DECODE_TAIL;
2293 }
2294
2295 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2296                              struct svc_export *exp)
2297 {
2298         if (exp->ex_flags & NFSEXP_V4ROOT) {
2299                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2300                 *p++ = 0;
2301         } else if (IS_I_VERSION(inode)) {
2302                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2303         } else {
2304                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2305                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2306         }
2307         return p;
2308 }
2309
2310 /*
2311  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2312  * doesn't really care what resolution could theoretically be stored by
2313  * the filesystem.
2314  *
2315  * The client cares how close together changes can be while still
2316  * guaranteeing ctime changes.  For most filesystems (which have
2317  * timestamps with nanosecond fields) that is limited by the resolution
2318  * of the time returned from current_time() (which I'm assuming to be
2319  * 1/HZ).
2320  */
2321 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2322 {
2323         struct timespec64 ts;
2324         u32 ns;
2325
2326         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2327         ts = ns_to_timespec64(ns);
2328
2329         p = xdr_encode_hyper(p, ts.tv_sec);
2330         *p++ = cpu_to_be32(ts.tv_nsec);
2331
2332         return p;
2333 }
2334
2335 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2336 {
2337         *p++ = cpu_to_be32(c->atomic);
2338         if (c->change_supported) {
2339                 p = xdr_encode_hyper(p, c->before_change);
2340                 p = xdr_encode_hyper(p, c->after_change);
2341         } else {
2342                 *p++ = cpu_to_be32(c->before_ctime_sec);
2343                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2344                 *p++ = cpu_to_be32(c->after_ctime_sec);
2345                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2346         }
2347         return p;
2348 }
2349
2350 /* Encode as an array of strings the string given with components
2351  * separated @sep, escaped with esc_enter and esc_exit.
2352  */
2353 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2354                                           char *components, char esc_enter,
2355                                           char esc_exit)
2356 {
2357         __be32 *p;
2358         __be32 pathlen;
2359         int pathlen_offset;
2360         int strlen, count=0;
2361         char *str, *end, *next;
2362
2363         dprintk("nfsd4_encode_components(%s)\n", components);
2364
2365         pathlen_offset = xdr->buf->len;
2366         p = xdr_reserve_space(xdr, 4);
2367         if (!p)
2368                 return nfserr_resource;
2369         p++; /* We will fill this in with @count later */
2370
2371         end = str = components;
2372         while (*end) {
2373                 bool found_esc = false;
2374
2375                 /* try to parse as esc_start, ..., esc_end, sep */
2376                 if (*str == esc_enter) {
2377                         for (; *end && (*end != esc_exit); end++)
2378                                 /* find esc_exit or end of string */;
2379                         next = end + 1;
2380                         if (*end && (!*next || *next == sep)) {
2381                                 str++;
2382                                 found_esc = true;
2383                         }
2384                 }
2385
2386                 if (!found_esc)
2387                         for (; *end && (*end != sep); end++)
2388                                 /* find sep or end of string */;
2389
2390                 strlen = end - str;
2391                 if (strlen) {
2392                         p = xdr_reserve_space(xdr, strlen + 4);
2393                         if (!p)
2394                                 return nfserr_resource;
2395                         p = xdr_encode_opaque(p, str, strlen);
2396                         count++;
2397                 }
2398                 else
2399                         end++;
2400                 if (found_esc)
2401                         end = next;
2402
2403                 str = end;
2404         }
2405         pathlen = htonl(count);
2406         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2407         return 0;
2408 }
2409
2410 /* Encode as an array of strings the string given with components
2411  * separated @sep.
2412  */
2413 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2414                                       char *components)
2415 {
2416         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2417 }
2418
2419 /*
2420  * encode a location element of a fs_locations structure
2421  */
2422 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2423                                         struct nfsd4_fs_location *location)
2424 {
2425         __be32 status;
2426
2427         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2428                                                 '[', ']');
2429         if (status)
2430                 return status;
2431         status = nfsd4_encode_components(xdr, '/', location->path);
2432         if (status)
2433                 return status;
2434         return 0;
2435 }
2436
2437 /*
2438  * Encode a path in RFC3530 'pathname4' format
2439  */
2440 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2441                                 const struct path *root,
2442                                 const struct path *path)
2443 {
2444         struct path cur = *path;
2445         __be32 *p;
2446         struct dentry **components = NULL;
2447         unsigned int ncomponents = 0;
2448         __be32 err = nfserr_jukebox;
2449
2450         dprintk("nfsd4_encode_components(");
2451
2452         path_get(&cur);
2453         /* First walk the path up to the nfsd root, and store the
2454          * dentries/path components in an array.
2455          */
2456         for (;;) {
2457                 if (path_equal(&cur, root))
2458                         break;
2459                 if (cur.dentry == cur.mnt->mnt_root) {
2460                         if (follow_up(&cur))
2461                                 continue;
2462                         goto out_free;
2463                 }
2464                 if ((ncomponents & 15) == 0) {
2465                         struct dentry **new;
2466                         new = krealloc(components,
2467                                         sizeof(*new) * (ncomponents + 16),
2468                                         GFP_KERNEL);
2469                         if (!new)
2470                                 goto out_free;
2471                         components = new;
2472                 }
2473                 components[ncomponents++] = cur.dentry;
2474                 cur.dentry = dget_parent(cur.dentry);
2475         }
2476         err = nfserr_resource;
2477         p = xdr_reserve_space(xdr, 4);
2478         if (!p)
2479                 goto out_free;
2480         *p++ = cpu_to_be32(ncomponents);
2481
2482         while (ncomponents) {
2483                 struct dentry *dentry = components[ncomponents - 1];
2484                 unsigned int len;
2485
2486                 spin_lock(&dentry->d_lock);
2487                 len = dentry->d_name.len;
2488                 p = xdr_reserve_space(xdr, len + 4);
2489                 if (!p) {
2490                         spin_unlock(&dentry->d_lock);
2491                         goto out_free;
2492                 }
2493                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2494                 dprintk("/%pd", dentry);
2495                 spin_unlock(&dentry->d_lock);
2496                 dput(dentry);
2497                 ncomponents--;
2498         }
2499
2500         err = 0;
2501 out_free:
2502         dprintk(")\n");
2503         while (ncomponents)
2504                 dput(components[--ncomponents]);
2505         kfree(components);
2506         path_put(&cur);
2507         return err;
2508 }
2509
2510 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2511                         struct svc_rqst *rqstp, const struct path *path)
2512 {
2513         struct svc_export *exp_ps;
2514         __be32 res;
2515
2516         exp_ps = rqst_find_fsidzero_export(rqstp);
2517         if (IS_ERR(exp_ps))
2518                 return nfserrno(PTR_ERR(exp_ps));
2519         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2520         exp_put(exp_ps);
2521         return res;
2522 }
2523
2524 /*
2525  *  encode a fs_locations structure
2526  */
2527 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2528                         struct svc_rqst *rqstp, struct svc_export *exp)
2529 {
2530         __be32 status;
2531         int i;
2532         __be32 *p;
2533         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2534
2535         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2536         if (status)
2537                 return status;
2538         p = xdr_reserve_space(xdr, 4);
2539         if (!p)
2540                 return nfserr_resource;
2541         *p++ = cpu_to_be32(fslocs->locations_count);
2542         for (i=0; i<fslocs->locations_count; i++) {
2543                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2544                 if (status)
2545                         return status;
2546         }
2547         return 0;
2548 }
2549
2550 static u32 nfs4_file_type(umode_t mode)
2551 {
2552         switch (mode & S_IFMT) {
2553         case S_IFIFO:   return NF4FIFO;
2554         case S_IFCHR:   return NF4CHR;
2555         case S_IFDIR:   return NF4DIR;
2556         case S_IFBLK:   return NF4BLK;
2557         case S_IFLNK:   return NF4LNK;
2558         case S_IFREG:   return NF4REG;
2559         case S_IFSOCK:  return NF4SOCK;
2560         default:        return NF4BAD;
2561         };
2562 }
2563
2564 static inline __be32
2565 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2566                      struct nfs4_ace *ace)
2567 {
2568         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2569                 return nfs4_acl_write_who(xdr, ace->whotype);
2570         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2571                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2572         else
2573                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2574 }
2575
2576 static inline __be32
2577 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2578 {
2579         __be32          *p;
2580         unsigned long   i = hweight_long(layout_types);
2581
2582         p = xdr_reserve_space(xdr, 4 + 4 * i);
2583         if (!p)
2584                 return nfserr_resource;
2585
2586         *p++ = cpu_to_be32(i);
2587
2588         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2589                 if (layout_types & (1 << i))
2590                         *p++ = cpu_to_be32(i);
2591
2592         return 0;
2593 }
2594
2595 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2596                               FATTR4_WORD0_RDATTR_ERROR)
2597 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2598 #define WORD2_ABSENT_FS_ATTRS 0
2599
2600 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2601 static inline __be32
2602 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2603                             void *context, int len)
2604 {
2605         __be32 *p;
2606
2607         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2608         if (!p)
2609                 return nfserr_resource;
2610
2611         /*
2612          * For now we use a 0 here to indicate the null translation; in
2613          * the future we may place a call to translation code here.
2614          */
2615         *p++ = cpu_to_be32(0); /* lfs */
2616         *p++ = cpu_to_be32(0); /* pi */
2617         p = xdr_encode_opaque(p, context, len);
2618         return 0;
2619 }
2620 #else
2621 static inline __be32
2622 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2623                             void *context, int len)
2624 { return 0; }
2625 #endif
2626
2627 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2628 {
2629         /* As per referral draft:  */
2630         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2631             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2632                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2633                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2634                         *rdattr_err = NFSERR_MOVED;
2635                 else
2636                         return nfserr_moved;
2637         }
2638         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2639         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2640         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2641         return 0;
2642 }
2643
2644
2645 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2646 {
2647         struct path path = exp->ex_path;
2648         int err;
2649
2650         path_get(&path);
2651         while (follow_up(&path)) {
2652                 if (path.dentry != path.mnt->mnt_root)
2653                         break;
2654         }
2655         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2656         path_put(&path);
2657         return err;
2658 }
2659
2660 static __be32
2661 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2662 {
2663         __be32 *p;
2664
2665         if (bmval2) {
2666                 p = xdr_reserve_space(xdr, 16);
2667                 if (!p)
2668                         goto out_resource;
2669                 *p++ = cpu_to_be32(3);
2670                 *p++ = cpu_to_be32(bmval0);
2671                 *p++ = cpu_to_be32(bmval1);
2672                 *p++ = cpu_to_be32(bmval2);
2673         } else if (bmval1) {
2674                 p = xdr_reserve_space(xdr, 12);
2675                 if (!p)
2676                         goto out_resource;
2677                 *p++ = cpu_to_be32(2);
2678                 *p++ = cpu_to_be32(bmval0);
2679                 *p++ = cpu_to_be32(bmval1);
2680         } else {
2681                 p = xdr_reserve_space(xdr, 8);
2682                 if (!p)
2683                         goto out_resource;
2684                 *p++ = cpu_to_be32(1);
2685                 *p++ = cpu_to_be32(bmval0);
2686         }
2687
2688         return 0;
2689 out_resource:
2690         return nfserr_resource;
2691 }
2692
2693 /*
2694  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2695  * ourselves.
2696  */
2697 static __be32
2698 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2699                 struct svc_export *exp,
2700                 struct dentry *dentry, u32 *bmval,
2701                 struct svc_rqst *rqstp, int ignore_crossmnt)
2702 {
2703         u32 bmval0 = bmval[0];
2704         u32 bmval1 = bmval[1];
2705         u32 bmval2 = bmval[2];
2706         struct kstat stat;
2707         struct svc_fh *tempfh = NULL;
2708         struct kstatfs statfs;
2709         __be32 *p;
2710         int starting_len = xdr->buf->len;
2711         int attrlen_offset;
2712         __be32 attrlen;
2713         u32 dummy;
2714         u64 dummy64;
2715         u32 rdattr_err = 0;
2716         __be32 status;
2717         int err;
2718         struct nfs4_acl *acl = NULL;
2719 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2720         void *context = NULL;
2721         int contextlen;
2722 #endif
2723         bool contextsupport = false;
2724         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2725         u32 minorversion = resp->cstate.minorversion;
2726         struct path path = {
2727                 .mnt    = exp->ex_path.mnt,
2728                 .dentry = dentry,
2729         };
2730         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2731
2732         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2733         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2734
2735         if (exp->ex_fslocs.migrated) {
2736                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2737                 if (status)
2738                         goto out;
2739         }
2740
2741         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2742         if (err)
2743                 goto out_nfserr;
2744         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2745                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2746             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2747                        FATTR4_WORD1_SPACE_TOTAL))) {
2748                 err = vfs_statfs(&path, &statfs);
2749                 if (err)
2750                         goto out_nfserr;
2751         }
2752         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2753                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2754                 status = nfserr_jukebox;
2755                 if (!tempfh)
2756                         goto out;
2757                 fh_init(tempfh, NFS4_FHSIZE);
2758                 status = fh_compose(tempfh, exp, dentry, NULL);
2759                 if (status)
2760                         goto out;
2761                 fhp = tempfh;
2762         }
2763         if (bmval0 & FATTR4_WORD0_ACL) {
2764                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2765                 if (err == -EOPNOTSUPP)
2766                         bmval0 &= ~FATTR4_WORD0_ACL;
2767                 else if (err == -EINVAL) {
2768                         status = nfserr_attrnotsupp;
2769                         goto out;
2770                 } else if (err != 0)
2771                         goto out_nfserr;
2772         }
2773
2774 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2775         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2776              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2777                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2778                         err = security_inode_getsecctx(d_inode(dentry),
2779                                                 &context, &contextlen);
2780                 else
2781                         err = -EOPNOTSUPP;
2782                 contextsupport = (err == 0);
2783                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2784                         if (err == -EOPNOTSUPP)
2785                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2786                         else if (err)
2787                                 goto out_nfserr;
2788                 }
2789         }
2790 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2791
2792         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2793         if (status)
2794                 goto out;
2795
2796         attrlen_offset = xdr->buf->len;
2797         p = xdr_reserve_space(xdr, 4);
2798         if (!p)
2799                 goto out_resource;
2800         p++;                /* to be backfilled later */
2801
2802         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2803                 u32 supp[3];
2804
2805                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2806
2807                 if (!IS_POSIXACL(dentry->d_inode))
2808                         supp[0] &= ~FATTR4_WORD0_ACL;
2809                 if (!contextsupport)
2810                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2811                 if (!supp[2]) {
2812                         p = xdr_reserve_space(xdr, 12);
2813                         if (!p)
2814                                 goto out_resource;
2815                         *p++ = cpu_to_be32(2);
2816                         *p++ = cpu_to_be32(supp[0]);
2817                         *p++ = cpu_to_be32(supp[1]);
2818                 } else {
2819                         p = xdr_reserve_space(xdr, 16);
2820                         if (!p)
2821                                 goto out_resource;
2822                         *p++ = cpu_to_be32(3);
2823                         *p++ = cpu_to_be32(supp[0]);
2824                         *p++ = cpu_to_be32(supp[1]);
2825                         *p++ = cpu_to_be32(supp[2]);
2826                 }
2827         }
2828         if (bmval0 & FATTR4_WORD0_TYPE) {
2829                 p = xdr_reserve_space(xdr, 4);
2830                 if (!p)
2831                         goto out_resource;
2832                 dummy = nfs4_file_type(stat.mode);
2833                 if (dummy == NF4BAD) {
2834                         status = nfserr_serverfault;
2835                         goto out;
2836                 }
2837                 *p++ = cpu_to_be32(dummy);
2838         }
2839         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2840                 p = xdr_reserve_space(xdr, 4);
2841                 if (!p)
2842                         goto out_resource;
2843                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2844                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2845                 else
2846                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2847                                                 NFS4_FH_VOL_RENAME);
2848         }
2849         if (bmval0 & FATTR4_WORD0_CHANGE) {
2850                 p = xdr_reserve_space(xdr, 8);
2851                 if (!p)
2852                         goto out_resource;
2853                 p = encode_change(p, &stat, d_inode(dentry), exp);
2854         }
2855         if (bmval0 & FATTR4_WORD0_SIZE) {
2856                 p = xdr_reserve_space(xdr, 8);
2857                 if (!p)
2858                         goto out_resource;
2859                 p = xdr_encode_hyper(p, stat.size);
2860         }
2861         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2862                 p = xdr_reserve_space(xdr, 4);
2863                 if (!p)
2864                         goto out_resource;
2865                 *p++ = cpu_to_be32(1);
2866         }
2867         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2868                 p = xdr_reserve_space(xdr, 4);
2869                 if (!p)
2870                         goto out_resource;
2871                 *p++ = cpu_to_be32(1);
2872         }
2873         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2874                 p = xdr_reserve_space(xdr, 4);
2875                 if (!p)
2876                         goto out_resource;
2877                 *p++ = cpu_to_be32(0);
2878         }
2879         if (bmval0 & FATTR4_WORD0_FSID) {
2880                 p = xdr_reserve_space(xdr, 16);
2881                 if (!p)
2882                         goto out_resource;
2883                 if (exp->ex_fslocs.migrated) {
2884                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2885                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2886                 } else switch(fsid_source(fhp)) {
2887                 case FSIDSOURCE_FSID:
2888                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2889                         p = xdr_encode_hyper(p, (u64)0);
2890                         break;
2891                 case FSIDSOURCE_DEV:
2892                         *p++ = cpu_to_be32(0);
2893                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2894                         *p++ = cpu_to_be32(0);
2895                         *p++ = cpu_to_be32(MINOR(stat.dev));
2896                         break;
2897                 case FSIDSOURCE_UUID:
2898                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2899                                                                 EX_UUID_LEN);
2900                         break;
2901                 }
2902         }
2903         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2904                 p = xdr_reserve_space(xdr, 4);
2905                 if (!p)
2906                         goto out_resource;
2907                 *p++ = cpu_to_be32(0);
2908         }
2909         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2910                 p = xdr_reserve_space(xdr, 4);
2911                 if (!p)
2912                         goto out_resource;
2913                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2914         }
2915         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2916                 p = xdr_reserve_space(xdr, 4);
2917                 if (!p)
2918                         goto out_resource;
2919                 *p++ = cpu_to_be32(rdattr_err);
2920         }
2921         if (bmval0 & FATTR4_WORD0_ACL) {
2922                 struct nfs4_ace *ace;
2923
2924                 if (acl == NULL) {
2925                         p = xdr_reserve_space(xdr, 4);
2926                         if (!p)
2927                                 goto out_resource;
2928
2929                         *p++ = cpu_to_be32(0);
2930                         goto out_acl;
2931                 }
2932                 p = xdr_reserve_space(xdr, 4);
2933                 if (!p)
2934                         goto out_resource;
2935                 *p++ = cpu_to_be32(acl->naces);
2936
2937                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2938                         p = xdr_reserve_space(xdr, 4*3);
2939                         if (!p)
2940                                 goto out_resource;
2941                         *p++ = cpu_to_be32(ace->type);
2942                         *p++ = cpu_to_be32(ace->flag);
2943                         *p++ = cpu_to_be32(ace->access_mask &
2944                                                         NFS4_ACE_MASK_ALL);
2945                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2946                         if (status)
2947                                 goto out;
2948                 }
2949         }
2950 out_acl:
2951         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2952                 p = xdr_reserve_space(xdr, 4);
2953                 if (!p)
2954                         goto out_resource;
2955                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2956                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2957         }
2958         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2959                 p = xdr_reserve_space(xdr, 4);
2960                 if (!p)
2961                         goto out_resource;
2962                 *p++ = cpu_to_be32(1);
2963         }
2964         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2965                 p = xdr_reserve_space(xdr, 4);
2966                 if (!p)
2967                         goto out_resource;
2968                 *p++ = cpu_to_be32(0);
2969         }
2970         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2971                 p = xdr_reserve_space(xdr, 4);
2972                 if (!p)
2973                         goto out_resource;
2974                 *p++ = cpu_to_be32(1);
2975         }
2976         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2977                 p = xdr_reserve_space(xdr, 4);
2978                 if (!p)
2979                         goto out_resource;
2980                 *p++ = cpu_to_be32(1);
2981         }
2982         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2983                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2984                 if (!p)
2985                         goto out_resource;
2986                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2987                                         fhp->fh_handle.fh_size);
2988         }
2989         if (bmval0 & FATTR4_WORD0_FILEID) {
2990                 p = xdr_reserve_space(xdr, 8);
2991                 if (!p)
2992                         goto out_resource;
2993                 p = xdr_encode_hyper(p, stat.ino);
2994         }
2995         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2996                 p = xdr_reserve_space(xdr, 8);
2997                 if (!p)
2998                         goto out_resource;
2999                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3000         }
3001         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
3002                 p = xdr_reserve_space(xdr, 8);
3003                 if (!p)
3004                         goto out_resource;
3005                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3006         }
3007         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
3008                 p = xdr_reserve_space(xdr, 8);
3009                 if (!p)
3010                         goto out_resource;
3011                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
3012         }
3013         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
3014                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
3015                 if (status)
3016                         goto out;
3017         }
3018         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
3019                 p = xdr_reserve_space(xdr, 4);
3020                 if (!p)
3021                         goto out_resource;
3022                 *p++ = cpu_to_be32(1);
3023         }
3024         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
3025                 p = xdr_reserve_space(xdr, 8);
3026                 if (!p)
3027                         goto out_resource;
3028                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
3029         }
3030         if (bmval0 & FATTR4_WORD0_MAXLINK) {
3031                 p = xdr_reserve_space(xdr, 4);
3032                 if (!p)
3033                         goto out_resource;
3034                 *p++ = cpu_to_be32(255);
3035         }
3036         if (bmval0 & FATTR4_WORD0_MAXNAME) {
3037                 p = xdr_reserve_space(xdr, 4);
3038                 if (!p)
3039                         goto out_resource;
3040                 *p++ = cpu_to_be32(statfs.f_namelen);
3041         }
3042         if (bmval0 & FATTR4_WORD0_MAXREAD) {
3043                 p = xdr_reserve_space(xdr, 8);
3044                 if (!p)
3045                         goto out_resource;
3046                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3047         }
3048         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
3049                 p = xdr_reserve_space(xdr, 8);
3050                 if (!p)
3051                         goto out_resource;
3052                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3053         }
3054         if (bmval1 & FATTR4_WORD1_MODE) {
3055                 p = xdr_reserve_space(xdr, 4);
3056                 if (!p)
3057                         goto out_resource;
3058                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
3059         }
3060         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
3061                 p = xdr_reserve_space(xdr, 4);
3062                 if (!p)
3063                         goto out_resource;
3064                 *p++ = cpu_to_be32(1);
3065         }
3066         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
3067                 p = xdr_reserve_space(xdr, 4);
3068                 if (!p)
3069                         goto out_resource;
3070                 *p++ = cpu_to_be32(stat.nlink);
3071         }
3072         if (bmval1 & FATTR4_WORD1_OWNER) {
3073                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
3074                 if (status)
3075                         goto out;
3076         }
3077         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
3078                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
3079                 if (status)
3080                         goto out;
3081         }
3082         if (bmval1 & FATTR4_WORD1_RAWDEV) {
3083                 p = xdr_reserve_space(xdr, 8);
3084                 if (!p)
3085                         goto out_resource;
3086                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3087                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
3088         }
3089         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
3090                 p = xdr_reserve_space(xdr, 8);
3091                 if (!p)
3092                         goto out_resource;
3093                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
3094                 p = xdr_encode_hyper(p, dummy64);
3095         }
3096         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
3097                 p = xdr_reserve_space(xdr, 8);
3098                 if (!p)
3099                         goto out_resource;
3100                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
3101                 p = xdr_encode_hyper(p, dummy64);
3102         }
3103         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
3104                 p = xdr_reserve_space(xdr, 8);
3105                 if (!p)
3106                         goto out_resource;
3107                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
3108                 p = xdr_encode_hyper(p, dummy64);
3109         }
3110         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
3111                 p = xdr_reserve_space(xdr, 8);
3112                 if (!p)
3113                         goto out_resource;
3114                 dummy64 = (u64)stat.blocks << 9;
3115                 p = xdr_encode_hyper(p, dummy64);
3116         }
3117         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
3118                 p = xdr_reserve_space(xdr, 12);
3119                 if (!p)
3120                         goto out_resource;
3121                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
3122                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
3123         }
3124         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
3125                 p = xdr_reserve_space(xdr, 12);
3126                 if (!p)
3127                         goto out_resource;
3128                 p = encode_time_delta(p, d_inode(dentry));
3129         }
3130         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
3131                 p = xdr_reserve_space(xdr, 12);
3132                 if (!p)
3133                         goto out_resource;
3134                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
3135                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
3136         }
3137         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
3138                 p = xdr_reserve_space(xdr, 12);
3139                 if (!p)
3140                         goto out_resource;
3141                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
3142                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
3143         }
3144         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
3145                 struct kstat parent_stat;
3146                 u64 ino = stat.ino;
3147
3148                 p = xdr_reserve_space(xdr, 8);
3149                 if (!p)
3150                         goto out_resource;
3151                 /*
3152                  * Get parent's attributes if not ignoring crossmount
3153                  * and this is the root of a cross-mounted filesystem.
3154                  */
3155                 if (ignore_crossmnt == 0 &&
3156                     dentry == exp->ex_path.mnt->mnt_root) {
3157                         err = get_parent_attributes(exp, &parent_stat);
3158                         if (err)
3159                                 goto out_nfserr;
3160                         ino = parent_stat.ino;
3161                 }
3162                 p = xdr_encode_hyper(p, ino);
3163         }
3164 #ifdef CONFIG_NFSD_PNFS
3165         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
3166                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3167                 if (status)
3168                         goto out;
3169         }
3170
3171         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
3172                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3173                 if (status)
3174                         goto out;
3175         }
3176
3177         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3178                 p = xdr_reserve_space(xdr, 4);
3179                 if (!p)
3180                         goto out_resource;
3181                 *p++ = cpu_to_be32(stat.blksize);
3182         }
3183 #endif /* CONFIG_NFSD_PNFS */
3184         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
3185                 u32 supp[3];
3186
3187                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3188                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3189                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3190                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3191
3192                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
3193                 if (status)
3194                         goto out;
3195         }
3196
3197         if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
3198                 p = xdr_reserve_space(xdr, 4);
3199                 if (!p)
3200                         goto out_resource;
3201                 if (IS_I_VERSION(d_inode(dentry)))
3202                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
3203                 else
3204                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
3205         }
3206
3207 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3208         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3209                 status = nfsd4_encode_security_label(xdr, rqstp, context,
3210                                                                 contextlen);
3211                 if (status)
3212                         goto out;
3213         }
3214 #endif
3215
3216         if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3217                 p = xdr_reserve_space(xdr, 4);
3218                 if (!p)
3219                         goto out_resource;
3220                 err = xattr_supported_namespace(d_inode(dentry),
3221                                                 XATTR_USER_PREFIX);
3222                 *p++ = cpu_to_be32(err == 0);
3223         }
3224
3225         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
3226         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
3227         status = nfs_ok;
3228
3229 out:
3230 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3231         if (context)
3232                 security_release_secctx(context, contextlen);
3233 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3234         kfree(acl);
3235         if (tempfh) {
3236                 fh_put(tempfh);
3237                 kfree(tempfh);
3238         }
3239         if (status)
3240                 xdr_truncate_encode(xdr, starting_len);
3241         return status;
3242 out_nfserr:
3243         status = nfserrno(err);
3244         goto out;
3245 out_resource:
3246         status = nfserr_resource;
3247         goto out;
3248 }
3249
3250 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3251                                 struct xdr_buf *buf, __be32 *p, int bytes)
3252 {
3253         xdr->scratch.iov_len = 0;
3254         memset(buf, 0, sizeof(struct xdr_buf));
3255         buf->head[0].iov_base = p;
3256         buf->head[0].iov_len = 0;
3257         buf->len = 0;
3258         xdr->buf = buf;
3259         xdr->iov = buf->head;
3260         xdr->p = p;
3261         xdr->end = (void *)p + bytes;
3262         buf->buflen = bytes;
3263 }
3264
3265 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3266                         struct svc_fh *fhp, struct svc_export *exp,
3267                         struct dentry *dentry, u32 *bmval,
3268                         struct svc_rqst *rqstp, int ignore_crossmnt)
3269 {
3270         struct xdr_buf dummy;
3271         struct xdr_stream xdr;
3272         __be32 ret;
3273
3274         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3275         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3276                                                         ignore_crossmnt);
3277         *p = xdr.p;
3278         return ret;
3279 }
3280
3281 static inline int attributes_need_mount(u32 *bmval)
3282 {
3283         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3284                 return 1;
3285         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3286                 return 1;
3287         return 0;
3288 }
3289
3290 static __be32
3291 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3292                         const char *name, int namlen)
3293 {
3294         struct svc_export *exp = cd->rd_fhp->fh_export;
3295         struct dentry *dentry;
3296         __be32 nfserr;
3297         int ignore_crossmnt = 0;
3298
3299         dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3300         if (IS_ERR(dentry))
3301                 return nfserrno(PTR_ERR(dentry));
3302
3303         exp_get(exp);
3304         /*
3305          * In the case of a mountpoint, the client may be asking for
3306          * attributes that are only properties of the underlying filesystem
3307          * as opposed to the cross-mounted file system. In such a case,
3308          * we will not follow the cross mount and will fill the attribtutes
3309          * directly from the mountpoint dentry.
3310          */
3311         if (nfsd_mountpoint(dentry, exp)) {
3312                 int err;
3313
3314                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3315                                 && !attributes_need_mount(cd->rd_bmval)) {
3316                         ignore_crossmnt = 1;
3317                         goto out_encode;
3318                 }
3319                 /*
3320                  * Why the heck aren't we just using nfsd_lookup??
3321                  * Different "."/".." handling?  Something else?
3322                  * At least, add a comment here to explain....
3323                  */
3324                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3325                 if (err) {
3326                         nfserr = nfserrno(err);
3327                         goto out_put;
3328                 }
3329                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3330                 if (nfserr)
3331                         goto out_put;
3332
3333         }
3334 out_encode:
3335         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3336                                         cd->rd_rqstp, ignore_crossmnt);
3337 out_put:
3338         dput(dentry);
3339         exp_put(exp);
3340         return nfserr;
3341 }
3342
3343 static __be32 *
3344 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3345 {
3346         __be32 *p;
3347
3348         p = xdr_reserve_space(xdr, 20);
3349         if (!p)
3350                 return NULL;
3351         *p++ = htonl(2);
3352         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3353         *p++ = htonl(0);                         /* bmval1 */
3354
3355         *p++ = htonl(4);     /* attribute length */
3356         *p++ = nfserr;       /* no htonl */
3357         return p;
3358 }
3359
3360 static int
3361 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3362                     loff_t offset, u64 ino, unsigned int d_type)
3363 {
3364         struct readdir_cd *ccd = ccdv;
3365         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3366         struct xdr_stream *xdr = cd->xdr;
3367         int start_offset = xdr->buf->len;
3368         int cookie_offset;
3369         u32 name_and_cookie;
3370         int entry_bytes;
3371         __be32 nfserr = nfserr_toosmall;
3372         __be64 wire_offset;
3373         __be32 *p;
3374
3375         /* In nfsv4, "." and ".." never make it onto the wire.. */
3376         if (name && isdotent(name, namlen)) {
3377                 cd->common.err = nfs_ok;
3378                 return 0;
3379         }
3380
3381         if (cd->cookie_offset) {
3382                 wire_offset = cpu_to_be64(offset);
3383                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3384                                                         &wire_offset, 8);
3385         }
3386
3387         p = xdr_reserve_space(xdr, 4);
3388         if (!p)
3389                 goto fail;
3390         *p++ = xdr_one;                             /* mark entry present */
3391         cookie_offset = xdr->buf->len;
3392         p = xdr_reserve_space(xdr, 3*4 + namlen);
3393         if (!p)
3394                 goto fail;
3395         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3396         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3397
3398         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3399         switch (nfserr) {
3400         case nfs_ok:
3401                 break;
3402         case nfserr_resource:
3403                 nfserr = nfserr_toosmall;
3404                 goto fail;
3405         case nfserr_noent:
3406                 xdr_truncate_encode(xdr, start_offset);
3407                 goto skip_entry;
3408         default:
3409                 /*
3410                  * If the client requested the RDATTR_ERROR attribute,
3411                  * we stuff the error code into this attribute
3412                  * and continue.  If this attribute was not requested,
3413                  * then in accordance with the spec, we fail the
3414                  * entire READDIR operation(!)
3415                  */
3416                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3417                         goto fail;
3418                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3419                 if (p == NULL) {
3420                         nfserr = nfserr_toosmall;
3421                         goto fail;
3422                 }
3423         }
3424         nfserr = nfserr_toosmall;
3425         entry_bytes = xdr->buf->len - start_offset;
3426         if (entry_bytes > cd->rd_maxcount)
3427                 goto fail;
3428         cd->rd_maxcount -= entry_bytes;
3429         /*
3430          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3431          * let's always let through the first entry, at least:
3432          */
3433         if (!cd->rd_dircount)
3434                 goto fail;
3435         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3436         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3437                 goto fail;
3438         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3439
3440         cd->cookie_offset = cookie_offset;
3441 skip_entry:
3442         cd->common.err = nfs_ok;
3443         return 0;
3444 fail:
3445         xdr_truncate_encode(xdr, start_offset);
3446         cd->common.err = nfserr;
3447         return -EINVAL;
3448 }
3449
3450 static __be32
3451 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3452 {
3453         __be32 *p;
3454
3455         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3456         if (!p)
3457                 return nfserr_resource;
3458         *p++ = cpu_to_be32(sid->si_generation);
3459         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3460                                         sizeof(stateid_opaque_t));
3461         return 0;
3462 }
3463
3464 static __be32
3465 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3466 {
3467         struct xdr_stream *xdr = &resp->xdr;
3468         __be32 *p;
3469
3470         p = xdr_reserve_space(xdr, 8);
3471         if (!p)
3472                 return nfserr_resource;
3473         *p++ = cpu_to_be32(access->ac_supported);
3474         *p++ = cpu_to_be32(access->ac_resp_access);
3475         return 0;
3476 }
3477
3478 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3479 {
3480         struct xdr_stream *xdr = &resp->xdr;
3481         __be32 *p;
3482
3483         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3484         if (!p)
3485                 return nfserr_resource;
3486         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3487                                         NFS4_MAX_SESSIONID_LEN);
3488         *p++ = cpu_to_be32(bcts->dir);
3489         /* Upshifting from TCP to RDMA is not supported */
3490         *p++ = cpu_to_be32(0);
3491         return 0;
3492 }
3493
3494 static __be32
3495 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3496 {
3497         struct xdr_stream *xdr = &resp->xdr;
3498
3499         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3500 }
3501
3502
3503 static __be32
3504 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3505 {
3506         struct xdr_stream *xdr = &resp->xdr;
3507         __be32 *p;
3508
3509         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3510         if (!p)
3511                 return nfserr_resource;
3512         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3513                                                 NFS4_VERIFIER_SIZE);
3514         return 0;
3515 }
3516
3517 static __be32
3518 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3519 {
3520         struct xdr_stream *xdr = &resp->xdr;
3521         __be32 *p;
3522
3523         p = xdr_reserve_space(xdr, 20);
3524         if (!p)
3525                 return nfserr_resource;
3526         encode_cinfo(p, &create->cr_cinfo);
3527         return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3528                         create->cr_bmval[1], create->cr_bmval[2]);
3529 }
3530
3531 static __be32
3532 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3533 {
3534         struct svc_fh *fhp = getattr->ga_fhp;
3535         struct xdr_stream *xdr = &resp->xdr;
3536
3537         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3538                                     getattr->ga_bmval, resp->rqstp, 0);
3539 }
3540
3541 static __be32
3542 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3543 {
3544         struct xdr_stream *xdr = &resp->xdr;
3545         struct svc_fh *fhp = *fhpp;
3546         unsigned int len;
3547         __be32 *p;
3548
3549         len = fhp->fh_handle.fh_size;
3550         p = xdr_reserve_space(xdr, len + 4);
3551         if (!p)
3552                 return nfserr_resource;
3553         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3554         return 0;
3555 }
3556
3557 /*
3558 * Including all fields other than the name, a LOCK4denied structure requires
3559 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3560 */
3561 static __be32
3562 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3563 {
3564         struct xdr_netobj *conf = &ld->ld_owner;
3565         __be32 *p;
3566
3567 again:
3568         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3569         if (!p) {
3570                 /*
3571                  * Don't fail to return the result just because we can't
3572                  * return the conflicting open:
3573                  */
3574                 if (conf->len) {
3575                         kfree(conf->data);
3576                         conf->len = 0;
3577                         conf->data = NULL;
3578                         goto again;
3579                 }
3580                 return nfserr_resource;
3581         }
3582         p = xdr_encode_hyper(p, ld->ld_start);
3583         p = xdr_encode_hyper(p, ld->ld_length);
3584         *p++ = cpu_to_be32(ld->ld_type);
3585         if (conf->len) {
3586                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3587                 p = xdr_encode_opaque(p, conf->data, conf->len);
3588                 kfree(conf->data);
3589         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3590                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3591                 *p++ = cpu_to_be32(0); /* length of owner name */
3592         }
3593         return nfserr_denied;
3594 }
3595
3596 static __be32
3597 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3598 {
3599         struct xdr_stream *xdr = &resp->xdr;
3600
3601         if (!nfserr)
3602                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3603         else if (nfserr == nfserr_denied)
3604                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3605
3606         return nfserr;
3607 }
3608
3609 static __be32
3610 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3611 {
3612         struct xdr_stream *xdr = &resp->xdr;
3613
3614         if (nfserr == nfserr_denied)
3615                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3616         return nfserr;
3617 }
3618
3619 static __be32
3620 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3621 {
3622         struct xdr_stream *xdr = &resp->xdr;
3623
3624         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3625 }
3626
3627
3628 static __be32
3629 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3630 {
3631         struct xdr_stream *xdr = &resp->xdr;
3632         __be32 *p;
3633
3634         p = xdr_reserve_space(xdr, 20);
3635         if (!p)
3636                 return nfserr_resource;
3637         p = encode_cinfo(p, &link->li_cinfo);
3638         return 0;
3639 }
3640
3641
3642 static __be32
3643 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3644 {
3645         struct xdr_stream *xdr = &resp->xdr;
3646         __be32 *p;
3647
3648         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3649         if (nfserr)
3650                 return nfserr;
3651         p = xdr_reserve_space(xdr, 24);
3652         if (!p)
3653                 return nfserr_resource;
3654         p = encode_cinfo(p, &open->op_cinfo);
3655         *p++ = cpu_to_be32(open->op_rflags);
3656
3657         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3658                                         open->op_bmval[2]);
3659         if (nfserr)
3660                 return nfserr;
3661
3662         p = xdr_reserve_space(xdr, 4);
3663         if (!p)
3664                 return nfserr_resource;
3665
3666         *p++ = cpu_to_be32(open->op_delegate_type);
3667         switch (open->op_delegate_type) {
3668         case NFS4_OPEN_DELEGATE_NONE:
3669                 break;
3670         case NFS4_OPEN_DELEGATE_READ:
3671                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3672                 if (nfserr)
3673                         return nfserr;
3674                 p = xdr_reserve_space(xdr, 20);
3675                 if (!p)
3676                         return nfserr_resource;
3677                 *p++ = cpu_to_be32(open->op_recall);
3678
3679                 /*
3680                  * TODO: ACE's in delegations
3681                  */
3682                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3683                 *p++ = cpu_to_be32(0);
3684                 *p++ = cpu_to_be32(0);
3685                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3686                 break;
3687         case NFS4_OPEN_DELEGATE_WRITE:
3688                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3689                 if (nfserr)
3690                         return nfserr;
3691                 p = xdr_reserve_space(xdr, 32);
3692                 if (!p)
3693                         return nfserr_resource;
3694                 *p++ = cpu_to_be32(0);
3695
3696                 /*
3697                  * TODO: space_limit's in delegations
3698                  */
3699                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3700                 *p++ = cpu_to_be32(~(u32)0);
3701                 *p++ = cpu_to_be32(~(u32)0);
3702
3703                 /*
3704                  * TODO: ACE's in delegations
3705                  */
3706                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3707                 *p++ = cpu_to_be32(0);
3708                 *p++ = cpu_to_be32(0);
3709                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3710                 break;
3711         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3712                 switch (open->op_why_no_deleg) {
3713                 case WND4_CONTENTION:
3714                 case WND4_RESOURCE:
3715                         p = xdr_reserve_space(xdr, 8);
3716                         if (!p)
3717                                 return nfserr_resource;
3718                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3719                         /* deleg signaling not supported yet: */
3720                         *p++ = cpu_to_be32(0);
3721                         break;
3722                 default:
3723                         p = xdr_reserve_space(xdr, 4);
3724                         if (!p)
3725                                 return nfserr_resource;
3726                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3727                 }
3728                 break;
3729         default:
3730                 BUG();
3731         }
3732         /* XXX save filehandle here */
3733         return 0;
3734 }
3735
3736 static __be32
3737 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3738 {
3739         struct xdr_stream *xdr = &resp->xdr;
3740
3741         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3742 }
3743
3744 static __be32
3745 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3746 {
3747         struct xdr_stream *xdr = &resp->xdr;
3748
3749         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3750 }
3751
3752 static __be32 nfsd4_encode_splice_read(
3753                                 struct nfsd4_compoundres *resp,
3754                                 struct nfsd4_read *read,
3755                                 struct file *file, unsigned long maxcount)
3756 {
3757         struct xdr_stream *xdr = &resp->xdr;
3758         struct xdr_buf *buf = xdr->buf;
3759         u32 eof;
3760         int space_left;
3761         __be32 nfserr;
3762         __be32 *p = xdr->p - 2;
3763
3764         /* Make sure there will be room for padding if needed */
3765         if (xdr->end - xdr->p < 1)
3766                 return nfserr_resource;
3767
3768         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3769                                   file, read->rd_offset, &maxcount, &eof);
3770         read->rd_length = maxcount;
3771         if (nfserr) {
3772                 /*
3773                  * nfsd_splice_actor may have already messed with the
3774                  * page length; reset it so as not to confuse
3775                  * xdr_truncate_encode:
3776                  */
3777                 buf->page_len = 0;
3778                 return nfserr;
3779         }
3780
3781         *(p++) = htonl(eof);
3782         *(p++) = htonl(maxcount);
3783
3784         buf->page_len = maxcount;
3785         buf->len += maxcount;
3786         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3787                                                         / PAGE_SIZE;
3788
3789         /* Use rest of head for padding and remaining ops: */
3790         buf->tail[0].iov_base = xdr->p;
3791         buf->tail[0].iov_len = 0;
3792         xdr->iov = buf->tail;
3793         if (maxcount&3) {
3794                 int pad = 4 - (maxcount&3);
3795
3796                 *(xdr->p++) = 0;
3797
3798                 buf->tail[0].iov_base += maxcount&3;
3799                 buf->tail[0].iov_len = pad;
3800                 buf->len += pad;
3801         }
3802
3803         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3804                                 buf->buflen - buf->len);
3805         buf->buflen = buf->len + space_left;
3806         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3807
3808         return 0;
3809 }
3810
3811 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3812                                  struct nfsd4_read *read,
3813                                  struct file *file, unsigned long maxcount)
3814 {
3815         struct xdr_stream *xdr = &resp->xdr;
3816         u32 eof;
3817         int starting_len = xdr->buf->len - 8;
3818         __be32 nfserr;
3819         __be32 tmp;
3820         int pad;
3821
3822         read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
3823         if (read->rd_vlen < 0)
3824                 return nfserr_resource;
3825
3826         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3827                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
3828                             &eof);
3829         read->rd_length = maxcount;
3830         if (nfserr)
3831                 return nfserr;
3832         if (svc_encode_read_payload(resp->rqstp, starting_len + 8, maxcount))
3833                 return nfserr_io;
3834         xdr_truncate_encode(xdr, starting_len + 8 + xdr_align_size(maxcount));
3835
3836         tmp = htonl(eof);
3837         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3838         tmp = htonl(maxcount);
3839         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3840
3841         tmp = xdr_zero;
3842         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3843         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3844                                                                 &tmp, pad);
3845         return 0;
3846
3847 }
3848
3849 static __be32
3850 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3851                   struct nfsd4_read *read)
3852 {
3853         unsigned long maxcount;
3854         struct xdr_stream *xdr = &resp->xdr;
3855         struct file *file;
3856         int starting_len = xdr->buf->len;
3857         __be32 *p;
3858
3859         if (nfserr)
3860                 return nfserr;
3861         file = read->rd_nf->nf_file;
3862
3863         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3864         if (!p) {
3865                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3866                 return nfserr_resource;
3867         }
3868         if (resp->xdr.buf->page_len &&
3869             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3870                 WARN_ON_ONCE(1);
3871                 return nfserr_resource;
3872         }
3873         xdr_commit_encode(xdr);
3874
3875         maxcount = svc_max_payload(resp->rqstp);
3876         maxcount = min_t(unsigned long, maxcount,
3877                          (xdr->buf->buflen - xdr->buf->len));
3878         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3879
3880         if (file->f_op->splice_read &&
3881             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3882                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3883         else
3884                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3885
3886         if (nfserr)
3887                 xdr_truncate_encode(xdr, starting_len);
3888
3889         return nfserr;
3890 }
3891
3892 static __be32
3893 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3894 {
3895         int maxcount;
3896         __be32 wire_count;
3897         int zero = 0;
3898         struct xdr_stream *xdr = &resp->xdr;
3899         int length_offset = xdr->buf->len;
3900         __be32 *p;
3901
3902         p = xdr_reserve_space(xdr, 4);
3903         if (!p)
3904                 return nfserr_resource;
3905         maxcount = PAGE_SIZE;
3906
3907         p = xdr_reserve_space(xdr, maxcount);
3908         if (!p)
3909                 return nfserr_resource;
3910         /*
3911          * XXX: By default, vfs_readlink() will truncate symlinks if they
3912          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3913          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3914          * that truncation occurred, and return NFS4ERR_RESOURCE.
3915          */
3916         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3917                                                 (char *)p, &maxcount);
3918         if (nfserr == nfserr_isdir)
3919                 nfserr = nfserr_inval;
3920         if (nfserr) {
3921                 xdr_truncate_encode(xdr, length_offset);
3922                 return nfserr;
3923         }
3924
3925         wire_count = htonl(maxcount);
3926         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3927         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3928         if (maxcount & 3)
3929                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3930                                                 &zero, 4 - (maxcount&3));
3931         return 0;
3932 }
3933
3934 static __be32
3935 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3936 {
3937         int maxcount;
3938         int bytes_left;
3939         loff_t offset;
3940         __be64 wire_offset;
3941         struct xdr_stream *xdr = &resp->xdr;
3942         int starting_len = xdr->buf->len;
3943         __be32 *p;
3944
3945         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3946         if (!p)
3947                 return nfserr_resource;
3948
3949         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3950         *p++ = cpu_to_be32(0);
3951         *p++ = cpu_to_be32(0);
3952         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3953                                 - (char *)resp->xdr.buf->head[0].iov_base;
3954
3955         /*
3956          * Number of bytes left for directory entries allowing for the
3957          * final 8 bytes of the readdir and a following failed op:
3958          */
3959         bytes_left = xdr->buf->buflen - xdr->buf->len
3960                         - COMPOUND_ERR_SLACK_SPACE - 8;
3961         if (bytes_left < 0) {
3962                 nfserr = nfserr_resource;
3963                 goto err_no_verf;
3964         }
3965         maxcount = svc_max_payload(resp->rqstp);
3966         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3967         /*
3968          * Note the rfc defines rd_maxcount as the size of the
3969          * READDIR4resok structure, which includes the verifier above
3970          * and the 8 bytes encoded at the end of this function:
3971          */
3972         if (maxcount < 16) {
3973                 nfserr = nfserr_toosmall;
3974                 goto err_no_verf;
3975         }
3976         maxcount = min_t(int, maxcount-16, bytes_left);
3977
3978         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3979         if (!readdir->rd_dircount)
3980                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3981
3982         readdir->xdr = xdr;
3983         readdir->rd_maxcount = maxcount;
3984         readdir->common.err = 0;
3985         readdir->cookie_offset = 0;
3986
3987         offset = readdir->rd_cookie;
3988         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3989                               &offset,
3990                               &readdir->common, nfsd4_encode_dirent);
3991         if (nfserr == nfs_ok &&
3992             readdir->common.err == nfserr_toosmall &&
3993             xdr->buf->len == starting_len + 8) {
3994                 /* nothing encoded; which limit did we hit?: */
3995                 if (maxcount - 16 < bytes_left)
3996                         /* It was the fault of rd_maxcount: */
3997                         nfserr = nfserr_toosmall;
3998                 else
3999                         /* We ran out of buffer space: */
4000                         nfserr = nfserr_resource;
4001         }
4002         if (nfserr)
4003                 goto err_no_verf;
4004
4005         if (readdir->cookie_offset) {
4006                 wire_offset = cpu_to_be64(offset);
4007                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4008                                                         &wire_offset, 8);
4009         }
4010
4011         p = xdr_reserve_space(xdr, 8);
4012         if (!p) {
4013                 WARN_ON_ONCE(1);
4014                 goto err_no_verf;
4015         }
4016         *p++ = 0;       /* no more entries */
4017         *p++ = htonl(readdir->common.err == nfserr_eof);
4018
4019         return 0;
4020 err_no_verf:
4021         xdr_truncate_encode(xdr, starting_len);
4022         return nfserr;
4023 }
4024
4025 static __be32
4026 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
4027 {
4028         struct xdr_stream *xdr = &resp->xdr;
4029         __be32 *p;
4030
4031         p = xdr_reserve_space(xdr, 20);
4032         if (!p)
4033                 return nfserr_resource;
4034         p = encode_cinfo(p, &remove->rm_cinfo);
4035         return 0;
4036 }
4037
4038 static __be32
4039 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
4040 {
4041         struct xdr_stream *xdr = &resp->xdr;
4042         __be32 *p;
4043
4044         p = xdr_reserve_space(xdr, 40);
4045         if (!p)
4046                 return nfserr_resource;
4047         p = encode_cinfo(p, &rename->rn_sinfo);
4048         p = encode_cinfo(p, &rename->rn_tinfo);
4049         return 0;
4050 }
4051
4052 static __be32
4053 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4054 {
4055         u32 i, nflavs, supported;
4056         struct exp_flavor_info *flavs;
4057         struct exp_flavor_info def_flavs[2];
4058         __be32 *p, *flavorsp;
4059         static bool report = true;
4060
4061         if (exp->ex_nflavors) {
4062                 flavs = exp->ex_flavors;
4063                 nflavs = exp->ex_nflavors;
4064         } else { /* Handling of some defaults in absence of real secinfo: */
4065                 flavs = def_flavs;
4066                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4067                         nflavs = 2;
4068                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4069                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
4070                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4071                         nflavs = 1;
4072                         flavs[0].pseudoflavor
4073                                         = svcauth_gss_flavor(exp->ex_client);
4074                 } else {
4075                         nflavs = 1;
4076                         flavs[0].pseudoflavor
4077                                         = exp->ex_client->flavour->flavour;
4078                 }
4079         }
4080
4081         supported = 0;
4082         p = xdr_reserve_space(xdr, 4);
4083         if (!p)
4084                 return nfserr_resource;
4085         flavorsp = p++;         /* to be backfilled later */
4086
4087         for (i = 0; i < nflavs; i++) {
4088                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4089                 struct rpcsec_gss_info info;
4090
4091                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4092                         supported++;
4093                         p = xdr_reserve_space(xdr, 4 + 4 +
4094                                               XDR_LEN(info.oid.len) + 4 + 4);
4095                         if (!p)
4096                                 return nfserr_resource;
4097                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
4098                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
4099                         *p++ = cpu_to_be32(info.qop);
4100                         *p++ = cpu_to_be32(info.service);
4101                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4102                         supported++;
4103                         p = xdr_reserve_space(xdr, 4);
4104                         if (!p)
4105                                 return nfserr_resource;
4106                         *p++ = cpu_to_be32(pf);
4107                 } else {
4108                         if (report)
4109                                 pr_warn("NFS: SECINFO: security flavor %u "
4110                                         "is not supported\n", pf);
4111                 }
4112         }
4113
4114         if (nflavs != supported)
4115                 report = false;
4116         *flavorsp = htonl(supported);
4117         return 0;
4118 }
4119
4120 static __be32
4121 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4122                      struct nfsd4_secinfo *secinfo)
4123 {
4124         struct xdr_stream *xdr = &resp->xdr;
4125
4126         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4127 }
4128
4129 static __be32
4130 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4131                      struct nfsd4_secinfo_no_name *secinfo)
4132 {
4133         struct xdr_stream *xdr = &resp->xdr;
4134
4135         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4136 }
4137
4138 /*
4139  * The SETATTR encode routine is special -- it always encodes a bitmap,
4140  * regardless of the error status.
4141  */
4142 static __be32
4143 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
4144 {
4145         struct xdr_stream *xdr = &resp->xdr;
4146         __be32 *p;
4147
4148         p = xdr_reserve_space(xdr, 16);
4149         if (!p)
4150                 return nfserr_resource;
4151         if (nfserr) {
4152                 *p++ = cpu_to_be32(3);
4153                 *p++ = cpu_to_be32(0);
4154                 *p++ = cpu_to_be32(0);
4155                 *p++ = cpu_to_be32(0);
4156         }
4157         else {
4158                 *p++ = cpu_to_be32(3);
4159                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4160                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4161                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
4162         }
4163         return nfserr;
4164 }
4165
4166 static __be32
4167 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
4168 {
4169         struct xdr_stream *xdr = &resp->xdr;
4170         __be32 *p;
4171
4172         if (!nfserr) {
4173                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4174                 if (!p)
4175                         return nfserr_resource;
4176                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4177                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4178                                                 NFS4_VERIFIER_SIZE);
4179         }
4180         else if (nfserr == nfserr_clid_inuse) {
4181                 p = xdr_reserve_space(xdr, 8);
4182                 if (!p)
4183                         return nfserr_resource;
4184                 *p++ = cpu_to_be32(0);
4185                 *p++ = cpu_to_be32(0);
4186         }
4187         return nfserr;
4188 }
4189
4190 static __be32
4191 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
4192 {
4193         struct xdr_stream *xdr = &resp->xdr;
4194         __be32 *p;
4195
4196         p = xdr_reserve_space(xdr, 16);
4197         if (!p)
4198                 return nfserr_resource;
4199         *p++ = cpu_to_be32(write->wr_bytes_written);
4200         *p++ = cpu_to_be32(write->wr_how_written);
4201         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4202                                                 NFS4_VERIFIER_SIZE);
4203         return 0;
4204 }
4205
4206 static __be32
4207 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4208                          struct nfsd4_exchange_id *exid)
4209 {
4210         struct xdr_stream *xdr = &resp->xdr;
4211         __be32 *p;
4212         char *major_id;
4213         char *server_scope;
4214         int major_id_sz;
4215         int server_scope_sz;
4216         uint64_t minor_id = 0;
4217         struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4218
4219         major_id = nn->nfsd_name;
4220         major_id_sz = strlen(nn->nfsd_name);
4221         server_scope = nn->nfsd_name;
4222         server_scope_sz = strlen(nn->nfsd_name);
4223
4224         p = xdr_reserve_space(xdr,
4225                 8 /* eir_clientid */ +
4226                 4 /* eir_sequenceid */ +
4227                 4 /* eir_flags */ +
4228                 4 /* spr_how */);
4229         if (!p)
4230                 return nfserr_resource;
4231
4232         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4233         *p++ = cpu_to_be32(exid->seqid);
4234         *p++ = cpu_to_be32(exid->flags);
4235
4236         *p++ = cpu_to_be32(exid->spa_how);
4237
4238         switch (exid->spa_how) {
4239         case SP4_NONE:
4240                 break;
4241         case SP4_MACH_CRED:
4242                 /* spo_must_enforce bitmap: */
4243                 nfserr = nfsd4_encode_bitmap(xdr,
4244                                         exid->spo_must_enforce[0],
4245                                         exid->spo_must_enforce[1],
4246                                         exid->spo_must_enforce[2]);
4247                 if (nfserr)
4248                         return nfserr;
4249                 /* spo_must_allow bitmap: */
4250                 nfserr = nfsd4_encode_bitmap(xdr,
4251                                         exid->spo_must_allow[0],
4252                                         exid->spo_must_allow[1],
4253                                         exid->spo_must_allow[2]);
4254                 if (nfserr)
4255                         return nfserr;
4256                 break;
4257         default:
4258                 WARN_ON_ONCE(1);
4259         }
4260
4261         p = xdr_reserve_space(xdr,
4262                 8 /* so_minor_id */ +
4263                 4 /* so_major_id.len */ +
4264                 (XDR_QUADLEN(major_id_sz) * 4) +
4265                 4 /* eir_server_scope.len */ +
4266                 (XDR_QUADLEN(server_scope_sz) * 4) +
4267                 4 /* eir_server_impl_id.count (0) */);
4268         if (!p)
4269                 return nfserr_resource;
4270
4271         /* The server_owner struct */
4272         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4273         /* major id */
4274         p = xdr_encode_opaque(p, major_id, major_id_sz);
4275
4276         /* Server scope */
4277         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4278
4279         /* Implementation id */
4280         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4281         return 0;
4282 }
4283
4284 static __be32
4285 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4286                             struct nfsd4_create_session *sess)
4287 {
4288         struct xdr_stream *xdr = &resp->xdr;
4289         __be32 *p;
4290
4291         p = xdr_reserve_space(xdr, 24);
4292         if (!p)
4293                 return nfserr_resource;
4294         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4295                                         NFS4_MAX_SESSIONID_LEN);
4296         *p++ = cpu_to_be32(sess->seqid);
4297         *p++ = cpu_to_be32(sess->flags);
4298
4299         p = xdr_reserve_space(xdr, 28);
4300         if (!p)
4301                 return nfserr_resource;
4302         *p++ = cpu_to_be32(0); /* headerpadsz */
4303         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4304         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4305         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4306         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4307         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4308         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4309
4310         if (sess->fore_channel.nr_rdma_attrs) {
4311                 p = xdr_reserve_space(xdr, 4);
4312                 if (!p)
4313                         return nfserr_resource;
4314                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4315         }
4316
4317         p = xdr_reserve_space(xdr, 28);
4318         if (!p)
4319                 return nfserr_resource;
4320         *p++ = cpu_to_be32(0); /* headerpadsz */
4321         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4322         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4323         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4324         *p++ = cpu_to_be32(sess->back_channel.maxops);
4325         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4326         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4327
4328         if (sess->back_channel.nr_rdma_attrs) {
4329                 p = xdr_reserve_space(xdr, 4);
4330                 if (!p)
4331                         return nfserr_resource;
4332                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4333         }
4334         return 0;
4335 }
4336
4337 static __be32
4338 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4339                       struct nfsd4_sequence *seq)
4340 {
4341         struct xdr_stream *xdr = &resp->xdr;
4342         __be32 *p;
4343
4344         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4345         if (!p)
4346                 return nfserr_resource;
4347         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4348                                         NFS4_MAX_SESSIONID_LEN);
4349         *p++ = cpu_to_be32(seq->seqid);
4350         *p++ = cpu_to_be32(seq->slotid);
4351         /* Note slotid's are numbered from zero: */
4352         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4353         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4354         *p++ = cpu_to_be32(seq->status_flags);
4355
4356         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4357         return 0;
4358 }
4359
4360 static __be32
4361 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4362                           struct nfsd4_test_stateid *test_stateid)
4363 {
4364         struct xdr_stream *xdr = &resp->xdr;
4365         struct nfsd4_test_stateid_id *stateid, *next;
4366         __be32 *p;
4367
4368         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4369         if (!p)
4370                 return nfserr_resource;
4371         *p++ = htonl(test_stateid->ts_num_ids);
4372
4373         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4374                 *p++ = stateid->ts_id_status;
4375         }
4376
4377         return 0;
4378 }
4379
4380 #ifdef CONFIG_NFSD_PNFS
4381 static __be32
4382 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4383                 struct nfsd4_getdeviceinfo *gdev)
4384 {
4385         struct xdr_stream *xdr = &resp->xdr;
4386         const struct nfsd4_layout_ops *ops;
4387         u32 starting_len = xdr->buf->len, needed_len;
4388         __be32 *p;
4389
4390         p = xdr_reserve_space(xdr, 4);
4391         if (!p)
4392                 return nfserr_resource;
4393
4394         *p++ = cpu_to_be32(gdev->gd_layout_type);
4395
4396         /* If maxcount is 0 then just update notifications */
4397         if (gdev->gd_maxcount != 0) {
4398                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4399                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4400                 if (nfserr) {
4401                         /*
4402                          * We don't bother to burden the layout drivers with
4403                          * enforcing gd_maxcount, just tell the client to
4404                          * come back with a bigger buffer if it's not enough.
4405                          */
4406                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4407                                 goto toosmall;
4408                         return nfserr;
4409                 }
4410         }
4411
4412         if (gdev->gd_notify_types) {
4413                 p = xdr_reserve_space(xdr, 4 + 4);
4414                 if (!p)
4415                         return nfserr_resource;
4416                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4417                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4418         } else {
4419                 p = xdr_reserve_space(xdr, 4);
4420                 if (!p)
4421                         return nfserr_resource;
4422                 *p++ = 0;
4423         }
4424
4425         return 0;
4426 toosmall:
4427         dprintk("%s: maxcount too small\n", __func__);
4428         needed_len = xdr->buf->len + 4 /* notifications */;
4429         xdr_truncate_encode(xdr, starting_len);
4430         p = xdr_reserve_space(xdr, 4);
4431         if (!p)
4432                 return nfserr_resource;
4433         *p++ = cpu_to_be32(needed_len);
4434         return nfserr_toosmall;
4435 }
4436
4437 static __be32
4438 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4439                 struct nfsd4_layoutget *lgp)
4440 {
4441         struct xdr_stream *xdr = &resp->xdr;
4442         const struct nfsd4_layout_ops *ops;
4443         __be32 *p;
4444
4445         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4446         if (!p)
4447                 return nfserr_resource;
4448
4449         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4450         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4451         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4452                                     sizeof(stateid_opaque_t));
4453
4454         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4455         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4456         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4457         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4458         *p++ = cpu_to_be32(lgp->lg_layout_type);
4459
4460         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4461         return ops->encode_layoutget(xdr, lgp);
4462 }
4463
4464 static __be32
4465 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4466                           struct nfsd4_layoutcommit *lcp)
4467 {
4468         struct xdr_stream *xdr = &resp->xdr;
4469         __be32 *p;
4470
4471         p = xdr_reserve_space(xdr, 4);
4472         if (!p)
4473                 return nfserr_resource;
4474         *p++ = cpu_to_be32(lcp->lc_size_chg);
4475         if (lcp->lc_size_chg) {
4476                 p = xdr_reserve_space(xdr, 8);
4477                 if (!p)
4478                         return nfserr_resource;
4479                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4480         }
4481
4482         return 0;
4483 }
4484
4485 static __be32
4486 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4487                 struct nfsd4_layoutreturn *lrp)
4488 {
4489         struct xdr_stream *xdr = &resp->xdr;
4490         __be32 *p;
4491
4492         p = xdr_reserve_space(xdr, 4);
4493         if (!p)
4494                 return nfserr_resource;
4495         *p++ = cpu_to_be32(lrp->lrs_present);
4496         if (lrp->lrs_present)
4497                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4498         return 0;
4499 }
4500 #endif /* CONFIG_NFSD_PNFS */
4501
4502 static __be32
4503 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4504                 struct nfsd42_write_res *write, bool sync)
4505 {
4506         __be32 *p;
4507         p = xdr_reserve_space(&resp->xdr, 4);
4508         if (!p)
4509                 return nfserr_resource;
4510
4511         if (sync)
4512                 *p++ = cpu_to_be32(0);
4513         else {
4514                 __be32 nfserr;
4515                 *p++ = cpu_to_be32(1);
4516                 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4517                 if (nfserr)
4518                         return nfserr;
4519         }
4520         p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4521         if (!p)
4522                 return nfserr_resource;
4523
4524         p = xdr_encode_hyper(p, write->wr_bytes_written);
4525         *p++ = cpu_to_be32(write->wr_stable_how);
4526         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4527                                     NFS4_VERIFIER_SIZE);
4528         return nfs_ok;
4529 }
4530
4531 static __be32
4532 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4533 {
4534         struct xdr_stream *xdr = &resp->xdr;
4535         struct nfs42_netaddr *addr;
4536         __be32 *p;
4537
4538         p = xdr_reserve_space(xdr, 4);
4539         *p++ = cpu_to_be32(ns->nl4_type);
4540
4541         switch (ns->nl4_type) {
4542         case NL4_NETADDR:
4543                 addr = &ns->u.nl4_addr;
4544
4545                 /* netid_len, netid, uaddr_len, uaddr (port included
4546                  * in RPCBIND_MAXUADDRLEN)
4547                  */
4548                 p = xdr_reserve_space(xdr,
4549                         4 /* netid len */ +
4550                         (XDR_QUADLEN(addr->netid_len) * 4) +
4551                         4 /* uaddr len */ +
4552                         (XDR_QUADLEN(addr->addr_len) * 4));
4553                 if (!p)
4554                         return nfserr_resource;
4555
4556                 *p++ = cpu_to_be32(addr->netid_len);
4557                 p = xdr_encode_opaque_fixed(p, addr->netid,
4558                                             addr->netid_len);
4559                 *p++ = cpu_to_be32(addr->addr_len);
4560                 p = xdr_encode_opaque_fixed(p, addr->addr,
4561                                         addr->addr_len);
4562                 break;
4563         default:
4564                 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4565                 return nfserr_inval;
4566         }
4567
4568         return 0;
4569 }
4570
4571 static __be32
4572 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4573                   struct nfsd4_copy *copy)
4574 {
4575         __be32 *p;
4576
4577         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4578                         copy->cp_synchronous);
4579         if (nfserr)
4580                 return nfserr;
4581
4582         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4583         *p++ = xdr_one; /* cr_consecutive */
4584         *p++ = cpu_to_be32(copy->cp_synchronous);
4585         return 0;
4586 }
4587
4588 static __be32
4589 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4590                             struct nfsd4_offload_status *os)
4591 {
4592         struct xdr_stream *xdr = &resp->xdr;
4593         __be32 *p;
4594
4595         p = xdr_reserve_space(xdr, 8 + 4);
4596         if (!p)
4597                 return nfserr_resource;
4598         p = xdr_encode_hyper(p, os->count);
4599         *p++ = cpu_to_be32(0);
4600         return nfserr;
4601 }
4602
4603 static __be32
4604 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
4605                             struct nfsd4_read *read,
4606                             unsigned long *maxcount, u32 *eof,
4607                             loff_t *pos)
4608 {
4609         struct xdr_stream *xdr = &resp->xdr;
4610         struct file *file = read->rd_nf->nf_file;
4611         int starting_len = xdr->buf->len;
4612         loff_t hole_pos;
4613         __be32 nfserr;
4614         __be32 *p, tmp;
4615         __be64 tmp64;
4616
4617         hole_pos = pos ? *pos : vfs_llseek(file, read->rd_offset, SEEK_HOLE);
4618         if (hole_pos > read->rd_offset)
4619                 *maxcount = min_t(unsigned long, *maxcount, hole_pos - read->rd_offset);
4620         *maxcount = min_t(unsigned long, *maxcount, (xdr->buf->buflen - xdr->buf->len));
4621
4622         /* Content type, offset, byte count */
4623         p = xdr_reserve_space(xdr, 4 + 8 + 4);
4624         if (!p)
4625                 return nfserr_resource;
4626
4627         read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, *maxcount);
4628         if (read->rd_vlen < 0)
4629                 return nfserr_resource;
4630
4631         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
4632                             resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof);
4633         if (nfserr)
4634                 return nfserr;
4635
4636         tmp = htonl(NFS4_CONTENT_DATA);
4637         write_bytes_to_xdr_buf(xdr->buf, starting_len,      &tmp,   4);
4638         tmp64 = cpu_to_be64(read->rd_offset);
4639         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4,  &tmp64, 8);
4640         tmp = htonl(*maxcount);
4641         write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp,   4);
4642         return nfs_ok;
4643 }
4644
4645 static __be32
4646 nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp,
4647                             struct nfsd4_read *read,
4648                             unsigned long *maxcount, u32 *eof)
4649 {
4650         struct file *file = read->rd_nf->nf_file;
4651         loff_t data_pos = vfs_llseek(file, read->rd_offset, SEEK_DATA);
4652         loff_t f_size = i_size_read(file_inode(file));
4653         unsigned long count;
4654         __be32 *p;
4655
4656         if (data_pos == -ENXIO)
4657                 data_pos = f_size;
4658         else if (data_pos <= read->rd_offset || (data_pos < f_size && data_pos % PAGE_SIZE))
4659                 return nfsd4_encode_read_plus_data(resp, read, maxcount, eof, &f_size);
4660         count = data_pos - read->rd_offset;
4661
4662         /* Content type, offset, byte count */
4663         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 8);
4664         if (!p)
4665                 return nfserr_resource;
4666
4667         *p++ = htonl(NFS4_CONTENT_HOLE);
4668          p   = xdr_encode_hyper(p, read->rd_offset);
4669          p   = xdr_encode_hyper(p, count);
4670
4671         *eof = (read->rd_offset + count) >= f_size;
4672         *maxcount = min_t(unsigned long, count, *maxcount);
4673         return nfs_ok;
4674 }
4675
4676 static __be32
4677 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
4678                        struct nfsd4_read *read)
4679 {
4680         unsigned long maxcount, count;
4681         struct xdr_stream *xdr = &resp->xdr;
4682         struct file *file;
4683         int starting_len = xdr->buf->len;
4684         int last_segment = xdr->buf->len;
4685         int segments = 0;
4686         __be32 *p, tmp;
4687         bool is_data;
4688         loff_t pos;
4689         u32 eof;
4690
4691         if (nfserr)
4692                 return nfserr;
4693         file = read->rd_nf->nf_file;
4694
4695         /* eof flag, segment count */
4696         p = xdr_reserve_space(xdr, 4 + 4);
4697         if (!p)
4698                 return nfserr_resource;
4699         xdr_commit_encode(xdr);
4700
4701         maxcount = svc_max_payload(resp->rqstp);
4702         maxcount = min_t(unsigned long, maxcount,
4703                          (xdr->buf->buflen - xdr->buf->len));
4704         maxcount = min_t(unsigned long, maxcount, read->rd_length);
4705         count    = maxcount;
4706
4707         eof = read->rd_offset >= i_size_read(file_inode(file));
4708         if (eof)
4709                 goto out;
4710
4711         pos = vfs_llseek(file, read->rd_offset, SEEK_HOLE);
4712         is_data = pos > read->rd_offset;
4713
4714         while (count > 0 && !eof) {
4715                 maxcount = count;
4716                 if (is_data)
4717                         nfserr = nfsd4_encode_read_plus_data(resp, read, &maxcount, &eof,
4718                                                 segments == 0 ? &pos : NULL);
4719                 else
4720                         nfserr = nfsd4_encode_read_plus_hole(resp, read, &maxcount, &eof);
4721                 if (nfserr)
4722                         goto out;
4723                 count -= maxcount;
4724                 read->rd_offset += maxcount;
4725                 is_data = !is_data;
4726                 last_segment = xdr->buf->len;
4727                 segments++;
4728         }
4729
4730 out:
4731         if (nfserr && segments == 0)
4732                 xdr_truncate_encode(xdr, starting_len);
4733         else {
4734                 tmp = htonl(eof);
4735                 write_bytes_to_xdr_buf(xdr->buf, starting_len,     &tmp, 4);
4736                 tmp = htonl(segments);
4737                 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
4738                 if (nfserr) {
4739                         xdr_truncate_encode(xdr, last_segment);
4740                         nfserr = nfs_ok;
4741                 }
4742         }
4743
4744         return nfserr;
4745 }
4746
4747 static __be32
4748 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4749                          struct nfsd4_copy_notify *cn)
4750 {
4751         struct xdr_stream *xdr = &resp->xdr;
4752         __be32 *p;
4753
4754         if (nfserr)
4755                 return nfserr;
4756
4757         /* 8 sec, 4 nsec */
4758         p = xdr_reserve_space(xdr, 12);
4759         if (!p)
4760                 return nfserr_resource;
4761
4762         /* cnr_lease_time */
4763         p = xdr_encode_hyper(p, cn->cpn_sec);
4764         *p++ = cpu_to_be32(cn->cpn_nsec);
4765
4766         /* cnr_stateid */
4767         nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4768         if (nfserr)
4769                 return nfserr;
4770
4771         /* cnr_src.nl_nsvr */
4772         p = xdr_reserve_space(xdr, 4);
4773         if (!p)
4774                 return nfserr_resource;
4775
4776         *p++ = cpu_to_be32(1);
4777
4778         return nfsd42_encode_nl4_server(resp, &cn->cpn_src);
4779 }
4780
4781 static __be32
4782 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4783                   struct nfsd4_seek *seek)
4784 {
4785         __be32 *p;
4786
4787         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4788         *p++ = cpu_to_be32(seek->seek_eof);
4789         p = xdr_encode_hyper(p, seek->seek_pos);
4790
4791         return 0;
4792 }
4793
4794 static __be32
4795 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4796 {
4797         return nfserr;
4798 }
4799
4800 /*
4801  * Encode kmalloc-ed buffer in to XDR stream.
4802  */
4803 static __be32
4804 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
4805 {
4806         u32 cplen;
4807         __be32 *p;
4808
4809         cplen = min_t(unsigned long, buflen,
4810                       ((void *)xdr->end - (void *)xdr->p));
4811         p = xdr_reserve_space(xdr, cplen);
4812         if (!p)
4813                 return nfserr_resource;
4814
4815         memcpy(p, buf, cplen);
4816         buf += cplen;
4817         buflen -= cplen;
4818
4819         while (buflen) {
4820                 cplen = min_t(u32, buflen, PAGE_SIZE);
4821                 p = xdr_reserve_space(xdr, cplen);
4822                 if (!p)
4823                         return nfserr_resource;
4824
4825                 memcpy(p, buf, cplen);
4826
4827                 if (cplen < PAGE_SIZE) {
4828                         /*
4829                          * We're done, with a length that wasn't page
4830                          * aligned, so possibly not word aligned. Pad
4831                          * any trailing bytes with 0.
4832                          */
4833                         xdr_encode_opaque_fixed(p, NULL, cplen);
4834                         break;
4835                 }
4836
4837                 buflen -= PAGE_SIZE;
4838                 buf += PAGE_SIZE;
4839         }
4840
4841         return 0;
4842 }
4843
4844 static __be32
4845 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4846                       struct nfsd4_getxattr *getxattr)
4847 {
4848         struct xdr_stream *xdr = &resp->xdr;
4849         __be32 *p, err;
4850
4851         p = xdr_reserve_space(xdr, 4);
4852         if (!p)
4853                 return nfserr_resource;
4854
4855         *p = cpu_to_be32(getxattr->getxa_len);
4856
4857         if (getxattr->getxa_len == 0)
4858                 return 0;
4859
4860         err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
4861                                     getxattr->getxa_len);
4862
4863         kvfree(getxattr->getxa_buf);
4864
4865         return err;
4866 }
4867
4868 static __be32
4869 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4870                       struct nfsd4_setxattr *setxattr)
4871 {
4872         struct xdr_stream *xdr = &resp->xdr;
4873         __be32 *p;
4874
4875         p = xdr_reserve_space(xdr, 20);
4876         if (!p)
4877                 return nfserr_resource;
4878
4879         encode_cinfo(p, &setxattr->setxa_cinfo);
4880
4881         return 0;
4882 }
4883
4884 /*
4885  * See if there are cookie values that can be rejected outright.
4886  */
4887 static __be32
4888 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
4889                                 u32 *offsetp)
4890 {
4891         u64 cookie = listxattrs->lsxa_cookie;
4892
4893         /*
4894          * If the cookie is larger than the maximum number we can fit
4895          * in either the buffer we just got back from vfs_listxattr, or,
4896          * XDR-encoded, in the return buffer, it's invalid.
4897          */
4898         if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
4899                 return nfserr_badcookie;
4900
4901         if (cookie > (listxattrs->lsxa_maxcount /
4902                       (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
4903                 return nfserr_badcookie;
4904
4905         *offsetp = (u32)cookie;
4906         return 0;
4907 }
4908
4909 static __be32
4910 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
4911                         struct nfsd4_listxattrs *listxattrs)
4912 {
4913         struct xdr_stream *xdr = &resp->xdr;
4914         u32 cookie_offset, count_offset, eof;
4915         u32 left, xdrleft, slen, count;
4916         u32 xdrlen, offset;
4917         u64 cookie;
4918         char *sp;
4919         __be32 status, tmp;
4920         __be32 *p;
4921         u32 nuser;
4922
4923         eof = 1;
4924
4925         status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
4926         if (status)
4927                 goto out;
4928
4929         /*
4930          * Reserve space for the cookie and the name array count. Record
4931          * the offsets to save them later.
4932          */
4933         cookie_offset = xdr->buf->len;
4934         count_offset = cookie_offset + 8;
4935         p = xdr_reserve_space(xdr, 12);
4936         if (!p) {
4937                 status = nfserr_resource;
4938                 goto out;
4939         }
4940
4941         count = 0;
4942         left = listxattrs->lsxa_len;
4943         sp = listxattrs->lsxa_buf;
4944         nuser = 0;
4945
4946         xdrleft = listxattrs->lsxa_maxcount;
4947
4948         while (left > 0 && xdrleft > 0) {
4949                 slen = strlen(sp);
4950
4951                 /*
4952                  * Check if this is a "user." attribute, skip it if not.
4953                  */
4954                 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
4955                         goto contloop;
4956
4957                 slen -= XATTR_USER_PREFIX_LEN;
4958                 xdrlen = 4 + ((slen + 3) & ~3);
4959                 if (xdrlen > xdrleft) {
4960                         if (count == 0) {
4961                                 /*
4962                                  * Can't even fit the first attribute name.
4963                                  */
4964                                 status = nfserr_toosmall;
4965                                 goto out;
4966                         }
4967                         eof = 0;
4968                         goto wreof;
4969                 }
4970
4971                 left -= XATTR_USER_PREFIX_LEN;
4972                 sp += XATTR_USER_PREFIX_LEN;
4973                 if (nuser++ < offset)
4974                         goto contloop;
4975
4976
4977                 p = xdr_reserve_space(xdr, xdrlen);
4978                 if (!p) {
4979                         status = nfserr_resource;
4980                         goto out;
4981                 }
4982
4983                 xdr_encode_opaque(p, sp, slen);
4984
4985                 xdrleft -= xdrlen;
4986                 count++;
4987 contloop:
4988                 sp += slen + 1;
4989                 left -= slen + 1;
4990         }
4991
4992         /*
4993          * If there were user attributes to copy, but we didn't copy
4994          * any, the offset was too large (e.g. the cookie was invalid).
4995          */
4996         if (nuser > 0 && count == 0) {
4997                 status = nfserr_badcookie;
4998                 goto out;
4999         }
5000
5001 wreof:
5002         p = xdr_reserve_space(xdr, 4);
5003         if (!p) {
5004                 status = nfserr_resource;
5005                 goto out;
5006         }
5007         *p = cpu_to_be32(eof);
5008
5009         cookie = offset + count;
5010
5011         write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
5012         tmp = cpu_to_be32(count);
5013         write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5014 out:
5015         if (listxattrs->lsxa_len)
5016                 kvfree(listxattrs->lsxa_buf);
5017         return status;
5018 }
5019
5020 static __be32
5021 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5022                          struct nfsd4_removexattr *removexattr)
5023 {
5024         struct xdr_stream *xdr = &resp->xdr;
5025         __be32 *p;
5026
5027         p = xdr_reserve_space(xdr, 20);
5028         if (!p)
5029                 return nfserr_resource;
5030
5031         p = encode_cinfo(p, &removexattr->rmxa_cinfo);
5032         return 0;
5033 }
5034
5035 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
5036
5037 /*
5038  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5039  * since we don't need to filter out obsolete ops as this is
5040  * done in the decoding phase.
5041  */
5042 static const nfsd4_enc nfsd4_enc_ops[] = {
5043         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
5044         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
5045         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
5046         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
5047         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
5048         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
5049         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
5050         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
5051         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
5052         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
5053         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
5054         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
5055         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
5056         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
5057         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
5058         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
5059         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
5060         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
5061         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
5062         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
5063         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
5064         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
5065         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
5066         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
5067         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
5068         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
5069         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
5070         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
5071         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
5072         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
5073         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
5074         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
5075         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
5076         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
5077         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
5078         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
5079         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
5080
5081         /* NFSv4.1 operations */
5082         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
5083         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
5084         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
5085         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
5086         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
5087         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
5088         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
5089 #ifdef CONFIG_NFSD_PNFS
5090         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
5091         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
5092         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
5093         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
5094         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
5095 #else
5096         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
5097         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
5098         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
5099         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
5100         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
5101 #endif
5102         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
5103         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
5104         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
5105         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
5106         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
5107         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
5108         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
5109
5110         /* NFSv4.2 operations */
5111         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
5112         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
5113         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_copy_notify,
5114         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
5115         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
5116         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
5117         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
5118         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
5119         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_offload_status,
5120         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_read_plus,
5121         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
5122         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
5123         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
5124
5125         /* RFC 8276 extended atributes operations */
5126         [OP_GETXATTR]           = (nfsd4_enc)nfsd4_encode_getxattr,
5127         [OP_SETXATTR]           = (nfsd4_enc)nfsd4_encode_setxattr,
5128         [OP_LISTXATTRS]         = (nfsd4_enc)nfsd4_encode_listxattrs,
5129         [OP_REMOVEXATTR]        = (nfsd4_enc)nfsd4_encode_removexattr,
5130 };
5131
5132 /*
5133  * Calculate whether we still have space to encode repsize bytes.
5134  * There are two considerations:
5135  *     - For NFS versions >=4.1, the size of the reply must stay within
5136  *       session limits
5137  *     - For all NFS versions, we must stay within limited preallocated
5138  *       buffer space.
5139  *
5140  * This is called before the operation is processed, so can only provide
5141  * an upper estimate.  For some nonidempotent operations (such as
5142  * getattr), it's not necessarily a problem if that estimate is wrong,
5143  * as we can fail it after processing without significant side effects.
5144  */
5145 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5146 {
5147         struct xdr_buf *buf = &resp->rqstp->rq_res;
5148         struct nfsd4_slot *slot = resp->cstate.slot;
5149
5150         if (buf->len + respsize <= buf->buflen)
5151                 return nfs_ok;
5152         if (!nfsd4_has_session(&resp->cstate))
5153                 return nfserr_resource;
5154         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5155                 WARN_ON_ONCE(1);
5156                 return nfserr_rep_too_big_to_cache;
5157         }
5158         return nfserr_rep_too_big;
5159 }
5160
5161 void
5162 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5163 {
5164         struct xdr_stream *xdr = &resp->xdr;
5165         struct nfs4_stateowner *so = resp->cstate.replay_owner;
5166         struct svc_rqst *rqstp = resp->rqstp;
5167         const struct nfsd4_operation *opdesc = op->opdesc;
5168         int post_err_offset;
5169         nfsd4_enc encoder;
5170         __be32 *p;
5171
5172         p = xdr_reserve_space(xdr, 8);
5173         if (!p) {
5174                 WARN_ON_ONCE(1);
5175                 return;
5176         }
5177         *p++ = cpu_to_be32(op->opnum);
5178         post_err_offset = xdr->buf->len;
5179
5180         if (op->opnum == OP_ILLEGAL)
5181                 goto status;
5182         if (op->status && opdesc &&
5183                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5184                 goto status;
5185         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5186                !nfsd4_enc_ops[op->opnum]);
5187         encoder = nfsd4_enc_ops[op->opnum];
5188         op->status = encoder(resp, op->status, &op->u);
5189         if (opdesc && opdesc->op_release)
5190                 opdesc->op_release(&op->u);
5191         xdr_commit_encode(xdr);
5192
5193         /* nfsd4_check_resp_size guarantees enough room for error status */
5194         if (!op->status) {
5195                 int space_needed = 0;
5196                 if (!nfsd4_last_compound_op(rqstp))
5197                         space_needed = COMPOUND_ERR_SLACK_SPACE;
5198                 op->status = nfsd4_check_resp_size(resp, space_needed);
5199         }
5200         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5201                 struct nfsd4_slot *slot = resp->cstate.slot;
5202
5203                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5204                         op->status = nfserr_rep_too_big_to_cache;
5205                 else
5206                         op->status = nfserr_rep_too_big;
5207         }
5208         if (op->status == nfserr_resource ||
5209             op->status == nfserr_rep_too_big ||
5210             op->status == nfserr_rep_too_big_to_cache) {
5211                 /*
5212                  * The operation may have already been encoded or
5213                  * partially encoded.  No op returns anything additional
5214                  * in the case of one of these three errors, so we can
5215                  * just truncate back to after the status.  But it's a
5216                  * bug if we had to do this on a non-idempotent op:
5217                  */
5218                 warn_on_nonidempotent_op(op);
5219                 xdr_truncate_encode(xdr, post_err_offset);
5220         }
5221         if (so) {
5222                 int len = xdr->buf->len - post_err_offset;
5223
5224                 so->so_replay.rp_status = op->status;
5225                 so->so_replay.rp_buflen = len;
5226                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5227                                                 so->so_replay.rp_buf, len);
5228         }
5229 status:
5230         /* Note that op->status is already in network byte order: */
5231         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
5232 }
5233
5234 /*
5235  * Encode the reply stored in the stateowner reply cache
5236  *
5237  * XDR note: do not encode rp->rp_buflen: the buffer contains the
5238  * previously sent already encoded operation.
5239  */
5240 void
5241 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5242 {
5243         __be32 *p;
5244         struct nfs4_replay *rp = op->replay;
5245
5246         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5247         if (!p) {
5248                 WARN_ON_ONCE(1);
5249                 return;
5250         }
5251         *p++ = cpu_to_be32(op->opnum);
5252         *p++ = rp->rp_status;  /* already xdr'ed */
5253
5254         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
5255 }
5256
5257 int
5258 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
5259 {
5260         return xdr_ressize_check(rqstp, p);
5261 }
5262
5263 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5264 {
5265         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5266
5267         if (args->ops != args->iops) {
5268                 kfree(args->ops);
5269                 args->ops = args->iops;
5270         }
5271         kfree(args->tmpp);
5272         args->tmpp = NULL;
5273         while (args->to_free) {
5274                 struct svcxdr_tmpbuf *tb = args->to_free;
5275                 args->to_free = tb->next;
5276                 kfree(tb);
5277         }
5278 }
5279
5280 int
5281 nfs4svc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p)
5282 {
5283         return 1;
5284 }
5285
5286 int
5287 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
5288 {
5289         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5290
5291         if (rqstp->rq_arg.head[0].iov_len % 4) {
5292                 /* client is nuts */
5293                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
5294                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
5295                 return 0;
5296         }
5297         args->p = p;
5298         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
5299         args->pagelist = rqstp->rq_arg.pages;
5300         args->pagelen = rqstp->rq_arg.page_len;
5301         args->tail = false;
5302         args->tmpp = NULL;
5303         args->to_free = NULL;
5304         args->ops = args->iops;
5305         args->rqstp = rqstp;
5306
5307         return !nfsd4_decode_compound(args);
5308 }
5309
5310 int
5311 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
5312 {
5313         struct nfsd4_compoundres *resp = rqstp->rq_resp;
5314         struct xdr_buf *buf = resp->xdr.buf;
5315
5316         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
5317                                  buf->tail[0].iov_len);
5318
5319         *p = resp->cstate.status;
5320
5321         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
5322
5323         p = resp->tagp;
5324         *p++ = htonl(resp->taglen);
5325         memcpy(p, resp->tag, resp->taglen);
5326         p += XDR_QUADLEN(resp->taglen);
5327         *p++ = htonl(resp->opcnt);
5328
5329         nfsd4_sequence_done(resp);
5330         return 1;
5331 }
5332
5333 /*
5334  * Local variables:
5335  *  c-basic-offset: 8
5336  * End:
5337  */