linux/fs/nfsd/nfs4xdr.c
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   1/*
   2 *  Server-side XDR for NFSv4
   3 *
   4 *  Copyright (c) 2002 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson   <andros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 *
  35 * TODO: Neil Brown made the following observation:  We currently
  36 * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37 * never release any of that until the request is complete.
  38 * It would be good to calculate a new maximum response size while
  39 * decoding the COMPOUND, and call svc_reserve with this number
  40 * at the end of nfs4svc_decode_compoundargs.
  41 */
  42
  43#include <linux/slab.h>
  44#include <linux/namei.h>
  45#include <linux/statfs.h>
  46#include <linux/utsname.h>
  47#include <linux/pagemap.h>
  48#include <linux/sunrpc/svcauth_gss.h>
  49
  50#include "idmap.h"
  51#include "acl.h"
  52#include "xdr4.h"
  53#include "vfs.h"
  54#include "state.h"
  55#include "cache.h"
  56#include "netns.h"
  57
  58#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  59#include <linux/security.h>
  60#endif
  61
  62
  63#define NFSDDBG_FACILITY                NFSDDBG_XDR
  64
  65/*
  66 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  67 * directory in order to indicate to the client that a filesystem boundary is present
  68 * We use a fixed fsid for a referral
  69 */
  70#define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  71#define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  72
  73static __be32
  74check_filename(char *str, int len)
  75{
  76        int i;
  77
  78        if (len == 0)
  79                return nfserr_inval;
  80        if (isdotent(str, len))
  81                return nfserr_badname;
  82        for (i = 0; i < len; i++)
  83                if (str[i] == '/')
  84                        return nfserr_badname;
  85        return 0;
  86}
  87
  88#define DECODE_HEAD                             \
  89        __be32 *p;                              \
  90        __be32 status
  91#define DECODE_TAIL                             \
  92        status = 0;                             \
  93out:                                            \
  94        return status;                          \
  95xdr_error:                                      \
  96        dprintk("NFSD: xdr error (%s:%d)\n",    \
  97                        __FILE__, __LINE__);    \
  98        status = nfserr_bad_xdr;                \
  99        goto out
 100
 101#define READ32(x)         (x) = ntohl(*p++)
 102#define READ64(x)         do {                  \
 103        (x) = (u64)ntohl(*p++) << 32;           \
 104        (x) |= ntohl(*p++);                     \
 105} while (0)
 106#define READTIME(x)       do {                  \
 107        p++;                                    \
 108        (x) = ntohl(*p++);                      \
 109        p++;                                    \
 110} while (0)
 111#define READMEM(x,nbytes) do {                  \
 112        x = (char *)p;                          \
 113        p += XDR_QUADLEN(nbytes);               \
 114} while (0)
 115#define SAVEMEM(x,nbytes) do {                  \
 116        if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 117                savemem(argp, p, nbytes) :      \
 118                (char *)p)) {                   \
 119                dprintk("NFSD: xdr error (%s:%d)\n", \
 120                                __FILE__, __LINE__); \
 121                goto xdr_error;                 \
 122                }                               \
 123        p += XDR_QUADLEN(nbytes);               \
 124} while (0)
 125#define COPYMEM(x,nbytes) do {                  \
 126        memcpy((x), p, nbytes);                 \
 127        p += XDR_QUADLEN(nbytes);               \
 128} while (0)
 129
 130/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 131#define READ_BUF(nbytes)  do {                  \
 132        if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 133                p = argp->p;                    \
 134                argp->p += XDR_QUADLEN(nbytes); \
 135        } else if (!(p = read_buf(argp, nbytes))) { \
 136                dprintk("NFSD: xdr error (%s:%d)\n", \
 137                                __FILE__, __LINE__); \
 138                goto xdr_error;                 \
 139        }                                       \
 140} while (0)
 141
 142static void next_decode_page(struct nfsd4_compoundargs *argp)
 143{
 144        argp->pagelist++;
 145        argp->p = page_address(argp->pagelist[0]);
 146        if (argp->pagelen < PAGE_SIZE) {
 147                argp->end = argp->p + (argp->pagelen>>2);
 148                argp->pagelen = 0;
 149        } else {
 150                argp->end = argp->p + (PAGE_SIZE>>2);
 151                argp->pagelen -= PAGE_SIZE;
 152        }
 153}
 154
 155static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 156{
 157        /* We want more bytes than seem to be available.
 158         * Maybe we need a new page, maybe we have just run out
 159         */
 160        unsigned int avail = (char *)argp->end - (char *)argp->p;
 161        __be32 *p;
 162        if (avail + argp->pagelen < nbytes)
 163                return NULL;
 164        if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 165                return NULL;
 166        /* ok, we can do it with the current plus the next page */
 167        if (nbytes <= sizeof(argp->tmp))
 168                p = argp->tmp;
 169        else {
 170                kfree(argp->tmpp);
 171                p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 172                if (!p)
 173                        return NULL;
 174                
 175        }
 176        /*
 177         * The following memcpy is safe because read_buf is always
 178         * called with nbytes > avail, and the two cases above both
 179         * guarantee p points to at least nbytes bytes.
 180         */
 181        memcpy(p, argp->p, avail);
 182        next_decode_page(argp);
 183        memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 184        argp->p += XDR_QUADLEN(nbytes - avail);
 185        return p;
 186}
 187
 188static int zero_clientid(clientid_t *clid)
 189{
 190        return (clid->cl_boot == 0) && (clid->cl_id == 0);
 191}
 192
 193static int
 194defer_free(struct nfsd4_compoundargs *argp,
 195                void (*release)(const void *), void *p)
 196{
 197        struct tmpbuf *tb;
 198
 199        tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 200        if (!tb)
 201                return -ENOMEM;
 202        tb->buf = p;
 203        tb->release = release;
 204        tb->next = argp->to_free;
 205        argp->to_free = tb;
 206        return 0;
 207}
 208
 209static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 210{
 211        if (p == argp->tmp) {
 212                p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 213                if (!p)
 214                        return NULL;
 215        } else {
 216                BUG_ON(p != argp->tmpp);
 217                argp->tmpp = NULL;
 218        }
 219        if (defer_free(argp, kfree, p)) {
 220                kfree(p);
 221                return NULL;
 222        } else
 223                return (char *)p;
 224}
 225
 226static __be32
 227nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 228{
 229        u32 bmlen;
 230        DECODE_HEAD;
 231
 232        bmval[0] = 0;
 233        bmval[1] = 0;
 234        bmval[2] = 0;
 235
 236        READ_BUF(4);
 237        READ32(bmlen);
 238        if (bmlen > 1000)
 239                goto xdr_error;
 240
 241        READ_BUF(bmlen << 2);
 242        if (bmlen > 0)
 243                READ32(bmval[0]);
 244        if (bmlen > 1)
 245                READ32(bmval[1]);
 246        if (bmlen > 2)
 247                READ32(bmval[2]);
 248
 249        DECODE_TAIL;
 250}
 251
 252static __be32
 253nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 254                   struct iattr *iattr, struct nfs4_acl **acl,
 255                   struct xdr_netobj *label)
 256{
 257        int expected_len, len = 0;
 258        u32 dummy32;
 259        char *buf;
 260        int host_err;
 261
 262        DECODE_HEAD;
 263        iattr->ia_valid = 0;
 264        if ((status = nfsd4_decode_bitmap(argp, bmval)))
 265                return status;
 266
 267        READ_BUF(4);
 268        READ32(expected_len);
 269
 270        if (bmval[0] & FATTR4_WORD0_SIZE) {
 271                READ_BUF(8);
 272                len += 8;
 273                READ64(iattr->ia_size);
 274                iattr->ia_valid |= ATTR_SIZE;
 275        }
 276        if (bmval[0] & FATTR4_WORD0_ACL) {
 277                u32 nace;
 278                struct nfs4_ace *ace;
 279
 280                READ_BUF(4); len += 4;
 281                READ32(nace);
 282
 283                if (nace > NFS4_ACL_MAX)
 284                        return nfserr_resource;
 285
 286                *acl = nfs4_acl_new(nace);
 287                if (*acl == NULL) {
 288                        host_err = -ENOMEM;
 289                        goto out_nfserr;
 290                }
 291                defer_free(argp, kfree, *acl);
 292
 293                (*acl)->naces = nace;
 294                for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 295                        READ_BUF(16); len += 16;
 296                        READ32(ace->type);
 297                        READ32(ace->flag);
 298                        READ32(ace->access_mask);
 299                        READ32(dummy32);
 300                        READ_BUF(dummy32);
 301                        len += XDR_QUADLEN(dummy32) << 2;
 302                        READMEM(buf, dummy32);
 303                        ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 304                        status = nfs_ok;
 305                        if (ace->whotype != NFS4_ACL_WHO_NAMED)
 306                                ;
 307                        else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 308                                status = nfsd_map_name_to_gid(argp->rqstp,
 309                                                buf, dummy32, &ace->who_gid);
 310                        else
 311                                status = nfsd_map_name_to_uid(argp->rqstp,
 312                                                buf, dummy32, &ace->who_uid);
 313                        if (status)
 314                                return status;
 315                }
 316        } else
 317                *acl = NULL;
 318        if (bmval[1] & FATTR4_WORD1_MODE) {
 319                READ_BUF(4);
 320                len += 4;
 321                READ32(iattr->ia_mode);
 322                iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 323                iattr->ia_valid |= ATTR_MODE;
 324        }
 325        if (bmval[1] & FATTR4_WORD1_OWNER) {
 326                READ_BUF(4);
 327                len += 4;
 328                READ32(dummy32);
 329                READ_BUF(dummy32);
 330                len += (XDR_QUADLEN(dummy32) << 2);
 331                READMEM(buf, dummy32);
 332                if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 333                        return status;
 334                iattr->ia_valid |= ATTR_UID;
 335        }
 336        if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 337                READ_BUF(4);
 338                len += 4;
 339                READ32(dummy32);
 340                READ_BUF(dummy32);
 341                len += (XDR_QUADLEN(dummy32) << 2);
 342                READMEM(buf, dummy32);
 343                if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 344                        return status;
 345                iattr->ia_valid |= ATTR_GID;
 346        }
 347        if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 348                READ_BUF(4);
 349                len += 4;
 350                READ32(dummy32);
 351                switch (dummy32) {
 352                case NFS4_SET_TO_CLIENT_TIME:
 353                        /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 354                           all 32 bits of 'nseconds'. */
 355                        READ_BUF(12);
 356                        len += 12;
 357                        READ64(iattr->ia_atime.tv_sec);
 358                        READ32(iattr->ia_atime.tv_nsec);
 359                        if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 360                                return nfserr_inval;
 361                        iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 362                        break;
 363                case NFS4_SET_TO_SERVER_TIME:
 364                        iattr->ia_valid |= ATTR_ATIME;
 365                        break;
 366                default:
 367                        goto xdr_error;
 368                }
 369        }
 370        if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 371                READ_BUF(4);
 372                len += 4;
 373                READ32(dummy32);
 374                switch (dummy32) {
 375                case NFS4_SET_TO_CLIENT_TIME:
 376                        /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 377                           all 32 bits of 'nseconds'. */
 378                        READ_BUF(12);
 379                        len += 12;
 380                        READ64(iattr->ia_mtime.tv_sec);
 381                        READ32(iattr->ia_mtime.tv_nsec);
 382                        if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 383                                return nfserr_inval;
 384                        iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 385                        break;
 386                case NFS4_SET_TO_SERVER_TIME:
 387                        iattr->ia_valid |= ATTR_MTIME;
 388                        break;
 389                default:
 390                        goto xdr_error;
 391                }
 392        }
 393
 394        label->len = 0;
 395#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 396        if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 397                READ_BUF(4);
 398                len += 4;
 399                READ32(dummy32); /* lfs: we don't use it */
 400                READ_BUF(4);
 401                len += 4;
 402                READ32(dummy32); /* pi: we don't use it either */
 403                READ_BUF(4);
 404                len += 4;
 405                READ32(dummy32);
 406                READ_BUF(dummy32);
 407                if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
 408                        return nfserr_badlabel;
 409                len += (XDR_QUADLEN(dummy32) << 2);
 410                READMEM(buf, dummy32);
 411                label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
 412                if (!label->data)
 413                        return nfserr_jukebox;
 414                defer_free(argp, kfree, label->data);
 415                memcpy(label->data, buf, dummy32);
 416        }
 417#endif
 418
 419        if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 420            || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 421            || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 422                READ_BUF(expected_len - len);
 423        else if (len != expected_len)
 424                goto xdr_error;
 425
 426        DECODE_TAIL;
 427
 428out_nfserr:
 429        status = nfserrno(host_err);
 430        goto out;
 431}
 432
 433static __be32
 434nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 435{
 436        DECODE_HEAD;
 437
 438        READ_BUF(sizeof(stateid_t));
 439        READ32(sid->si_generation);
 440        COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 441
 442        DECODE_TAIL;
 443}
 444
 445static __be32
 446nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 447{
 448        DECODE_HEAD;
 449
 450        READ_BUF(4);
 451        READ32(access->ac_req_access);
 452
 453        DECODE_TAIL;
 454}
 455
 456static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 457{
 458        DECODE_HEAD;
 459        u32 dummy, uid, gid;
 460        char *machine_name;
 461        int i;
 462        int nr_secflavs;
 463
 464        /* callback_sec_params4 */
 465        READ_BUF(4);
 466        READ32(nr_secflavs);
 467        if (nr_secflavs)
 468                cbs->flavor = (u32)(-1);
 469        else
 470                /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 471                cbs->flavor = 0;
 472        for (i = 0; i < nr_secflavs; ++i) {
 473                READ_BUF(4);
 474                READ32(dummy);
 475                switch (dummy) {
 476                case RPC_AUTH_NULL:
 477                        /* Nothing to read */
 478                        if (cbs->flavor == (u32)(-1))
 479                                cbs->flavor = RPC_AUTH_NULL;
 480                        break;
 481                case RPC_AUTH_UNIX:
 482                        READ_BUF(8);
 483                        /* stamp */
 484                        READ32(dummy);
 485
 486                        /* machine name */
 487                        READ32(dummy);
 488                        READ_BUF(dummy);
 489                        SAVEMEM(machine_name, dummy);
 490
 491                        /* uid, gid */
 492                        READ_BUF(8);
 493                        READ32(uid);
 494                        READ32(gid);
 495
 496                        /* more gids */
 497                        READ_BUF(4);
 498                        READ32(dummy);
 499                        READ_BUF(dummy * 4);
 500                        if (cbs->flavor == (u32)(-1)) {
 501                                kuid_t kuid = make_kuid(&init_user_ns, uid);
 502                                kgid_t kgid = make_kgid(&init_user_ns, gid);
 503                                if (uid_valid(kuid) && gid_valid(kgid)) {
 504                                        cbs->uid = kuid;
 505                                        cbs->gid = kgid;
 506                                        cbs->flavor = RPC_AUTH_UNIX;
 507                                } else {
 508                                        dprintk("RPC_AUTH_UNIX with invalid"
 509                                                "uid or gid ignoring!\n");
 510                                }
 511                        }
 512                        break;
 513                case RPC_AUTH_GSS:
 514                        dprintk("RPC_AUTH_GSS callback secflavor "
 515                                "not supported!\n");
 516                        READ_BUF(8);
 517                        /* gcbp_service */
 518                        READ32(dummy);
 519                        /* gcbp_handle_from_server */
 520                        READ32(dummy);
 521                        READ_BUF(dummy);
 522                        p += XDR_QUADLEN(dummy);
 523                        /* gcbp_handle_from_client */
 524                        READ_BUF(4);
 525                        READ32(dummy);
 526                        READ_BUF(dummy);
 527                        break;
 528                default:
 529                        dprintk("Illegal callback secflavor\n");
 530                        return nfserr_inval;
 531                }
 532        }
 533        DECODE_TAIL;
 534}
 535
 536static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 537{
 538        DECODE_HEAD;
 539
 540        READ_BUF(4);
 541        READ32(bc->bc_cb_program);
 542        nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 543
 544        DECODE_TAIL;
 545}
 546
 547static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 548{
 549        DECODE_HEAD;
 550
 551        READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 552        COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 553        READ32(bcts->dir);
 554        /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 555         * could help us figure out we should be using it. */
 556        DECODE_TAIL;
 557}
 558
 559static __be32
 560nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 561{
 562        DECODE_HEAD;
 563
 564        READ_BUF(4);
 565        READ32(close->cl_seqid);
 566        return nfsd4_decode_stateid(argp, &close->cl_stateid);
 567
 568        DECODE_TAIL;
 569}
 570
 571
 572static __be32
 573nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 574{
 575        DECODE_HEAD;
 576
 577        READ_BUF(12);
 578        READ64(commit->co_offset);
 579        READ32(commit->co_count);
 580
 581        DECODE_TAIL;
 582}
 583
 584static __be32
 585nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 586{
 587        DECODE_HEAD;
 588
 589        READ_BUF(4);
 590        READ32(create->cr_type);
 591        switch (create->cr_type) {
 592        case NF4LNK:
 593                READ_BUF(4);
 594                READ32(create->cr_linklen);
 595                READ_BUF(create->cr_linklen);
 596                SAVEMEM(create->cr_linkname, create->cr_linklen);
 597                break;
 598        case NF4BLK:
 599        case NF4CHR:
 600                READ_BUF(8);
 601                READ32(create->cr_specdata1);
 602                READ32(create->cr_specdata2);
 603                break;
 604        case NF4SOCK:
 605        case NF4FIFO:
 606        case NF4DIR:
 607        default:
 608                break;
 609        }
 610
 611        READ_BUF(4);
 612        READ32(create->cr_namelen);
 613        READ_BUF(create->cr_namelen);
 614        SAVEMEM(create->cr_name, create->cr_namelen);
 615        if ((status = check_filename(create->cr_name, create->cr_namelen)))
 616                return status;
 617
 618        status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 619                                    &create->cr_acl, &create->cr_label);
 620        if (status)
 621                goto out;
 622
 623        DECODE_TAIL;
 624}
 625
 626static inline __be32
 627nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 628{
 629        return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 630}
 631
 632static inline __be32
 633nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 634{
 635        return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 636}
 637
 638static __be32
 639nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 640{
 641        DECODE_HEAD;
 642
 643        READ_BUF(4);
 644        READ32(link->li_namelen);
 645        READ_BUF(link->li_namelen);
 646        SAVEMEM(link->li_name, link->li_namelen);
 647        if ((status = check_filename(link->li_name, link->li_namelen)))
 648                return status;
 649
 650        DECODE_TAIL;
 651}
 652
 653static __be32
 654nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 655{
 656        DECODE_HEAD;
 657
 658        /*
 659        * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 660        */
 661        READ_BUF(28);
 662        READ32(lock->lk_type);
 663        if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 664                goto xdr_error;
 665        READ32(lock->lk_reclaim);
 666        READ64(lock->lk_offset);
 667        READ64(lock->lk_length);
 668        READ32(lock->lk_is_new);
 669
 670        if (lock->lk_is_new) {
 671                READ_BUF(4);
 672                READ32(lock->lk_new_open_seqid);
 673                status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 674                if (status)
 675                        return status;
 676                READ_BUF(8 + sizeof(clientid_t));
 677                READ32(lock->lk_new_lock_seqid);
 678                COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 679                READ32(lock->lk_new_owner.len);
 680                READ_BUF(lock->lk_new_owner.len);
 681                READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 682        } else {
 683                status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 684                if (status)
 685                        return status;
 686                READ_BUF(4);
 687                READ32(lock->lk_old_lock_seqid);
 688        }
 689
 690        DECODE_TAIL;
 691}
 692
 693static __be32
 694nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 695{
 696        DECODE_HEAD;
 697                        
 698        READ_BUF(32);
 699        READ32(lockt->lt_type);
 700        if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 701                goto xdr_error;
 702        READ64(lockt->lt_offset);
 703        READ64(lockt->lt_length);
 704        COPYMEM(&lockt->lt_clientid, 8);
 705        READ32(lockt->lt_owner.len);
 706        READ_BUF(lockt->lt_owner.len);
 707        READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 708
 709        DECODE_TAIL;
 710}
 711
 712static __be32
 713nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 714{
 715        DECODE_HEAD;
 716
 717        READ_BUF(8);
 718        READ32(locku->lu_type);
 719        if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 720                goto xdr_error;
 721        READ32(locku->lu_seqid);
 722        status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 723        if (status)
 724                return status;
 725        READ_BUF(16);
 726        READ64(locku->lu_offset);
 727        READ64(locku->lu_length);
 728
 729        DECODE_TAIL;
 730}
 731
 732static __be32
 733nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 734{
 735        DECODE_HEAD;
 736
 737        READ_BUF(4);
 738        READ32(lookup->lo_len);
 739        READ_BUF(lookup->lo_len);
 740        SAVEMEM(lookup->lo_name, lookup->lo_len);
 741        if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 742                return status;
 743
 744        DECODE_TAIL;
 745}
 746
 747static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 748{
 749        __be32 *p;
 750        u32 w;
 751
 752        READ_BUF(4);
 753        READ32(w);
 754        *share_access = w & NFS4_SHARE_ACCESS_MASK;
 755        *deleg_want = w & NFS4_SHARE_WANT_MASK;
 756        if (deleg_when)
 757                *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 758
 759        switch (w & NFS4_SHARE_ACCESS_MASK) {
 760        case NFS4_SHARE_ACCESS_READ:
 761        case NFS4_SHARE_ACCESS_WRITE:
 762        case NFS4_SHARE_ACCESS_BOTH:
 763                break;
 764        default:
 765                return nfserr_bad_xdr;
 766        }
 767        w &= ~NFS4_SHARE_ACCESS_MASK;
 768        if (!w)
 769                return nfs_ok;
 770        if (!argp->minorversion)
 771                return nfserr_bad_xdr;
 772        switch (w & NFS4_SHARE_WANT_MASK) {
 773        case NFS4_SHARE_WANT_NO_PREFERENCE:
 774        case NFS4_SHARE_WANT_READ_DELEG:
 775        case NFS4_SHARE_WANT_WRITE_DELEG:
 776        case NFS4_SHARE_WANT_ANY_DELEG:
 777        case NFS4_SHARE_WANT_NO_DELEG:
 778        case NFS4_SHARE_WANT_CANCEL:
 779                break;
 780        default:
 781                return nfserr_bad_xdr;
 782        }
 783        w &= ~NFS4_SHARE_WANT_MASK;
 784        if (!w)
 785                return nfs_ok;
 786
 787        if (!deleg_when)        /* open_downgrade */
 788                return nfserr_inval;
 789        switch (w) {
 790        case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 791        case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 792        case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 793              NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 794                return nfs_ok;
 795        }
 796xdr_error:
 797        return nfserr_bad_xdr;
 798}
 799
 800static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 801{
 802        __be32 *p;
 803
 804        READ_BUF(4);
 805        READ32(*x);
 806        /* Note: unlinke access bits, deny bits may be zero. */
 807        if (*x & ~NFS4_SHARE_DENY_BOTH)
 808                return nfserr_bad_xdr;
 809        return nfs_ok;
 810xdr_error:
 811        return nfserr_bad_xdr;
 812}
 813
 814static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 815{
 816        __be32 *p;
 817
 818        READ_BUF(4);
 819        READ32(o->len);
 820
 821        if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 822                return nfserr_bad_xdr;
 823
 824        READ_BUF(o->len);
 825        SAVEMEM(o->data, o->len);
 826        return nfs_ok;
 827xdr_error:
 828        return nfserr_bad_xdr;
 829}
 830
 831static __be32
 832nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 833{
 834        DECODE_HEAD;
 835        u32 dummy;
 836
 837        memset(open->op_bmval, 0, sizeof(open->op_bmval));
 838        open->op_iattr.ia_valid = 0;
 839        open->op_openowner = NULL;
 840
 841        open->op_xdr_error = 0;
 842        /* seqid, share_access, share_deny, clientid, ownerlen */
 843        READ_BUF(4);
 844        READ32(open->op_seqid);
 845        /* decode, yet ignore deleg_when until supported */
 846        status = nfsd4_decode_share_access(argp, &open->op_share_access,
 847                                           &open->op_deleg_want, &dummy);
 848        if (status)
 849                goto xdr_error;
 850        status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 851        if (status)
 852                goto xdr_error;
 853        READ_BUF(sizeof(clientid_t));
 854        COPYMEM(&open->op_clientid, sizeof(clientid_t));
 855        status = nfsd4_decode_opaque(argp, &open->op_owner);
 856        if (status)
 857                goto xdr_error;
 858        READ_BUF(4);
 859        READ32(open->op_create);
 860        switch (open->op_create) {
 861        case NFS4_OPEN_NOCREATE:
 862                break;
 863        case NFS4_OPEN_CREATE:
 864                READ_BUF(4);
 865                READ32(open->op_createmode);
 866                switch (open->op_createmode) {
 867                case NFS4_CREATE_UNCHECKED:
 868                case NFS4_CREATE_GUARDED:
 869                        status = nfsd4_decode_fattr(argp, open->op_bmval,
 870                                &open->op_iattr, &open->op_acl, &open->op_label);
 871                        if (status)
 872                                goto out;
 873                        break;
 874                case NFS4_CREATE_EXCLUSIVE:
 875                        READ_BUF(NFS4_VERIFIER_SIZE);
 876                        COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 877                        break;
 878                case NFS4_CREATE_EXCLUSIVE4_1:
 879                        if (argp->minorversion < 1)
 880                                goto xdr_error;
 881                        READ_BUF(NFS4_VERIFIER_SIZE);
 882                        COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 883                        status = nfsd4_decode_fattr(argp, open->op_bmval,
 884                                &open->op_iattr, &open->op_acl, &open->op_label);
 885                        if (status)
 886                                goto out;
 887                        break;
 888                default:
 889                        goto xdr_error;
 890                }
 891                break;
 892        default:
 893                goto xdr_error;
 894        }
 895
 896        /* open_claim */
 897        READ_BUF(4);
 898        READ32(open->op_claim_type);
 899        switch (open->op_claim_type) {
 900        case NFS4_OPEN_CLAIM_NULL:
 901        case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 902                READ_BUF(4);
 903                READ32(open->op_fname.len);
 904                READ_BUF(open->op_fname.len);
 905                SAVEMEM(open->op_fname.data, open->op_fname.len);
 906                if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 907                        return status;
 908                break;
 909        case NFS4_OPEN_CLAIM_PREVIOUS:
 910                READ_BUF(4);
 911                READ32(open->op_delegate_type);
 912                break;
 913        case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 914                status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 915                if (status)
 916                        return status;
 917                READ_BUF(4);
 918                READ32(open->op_fname.len);
 919                READ_BUF(open->op_fname.len);
 920                SAVEMEM(open->op_fname.data, open->op_fname.len);
 921                if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 922                        return status;
 923                break;
 924        case NFS4_OPEN_CLAIM_FH:
 925        case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 926                if (argp->minorversion < 1)
 927                        goto xdr_error;
 928                /* void */
 929                break;
 930        case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 931                if (argp->minorversion < 1)
 932                        goto xdr_error;
 933                status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 934                if (status)
 935                        return status;
 936                break;
 937        default:
 938                goto xdr_error;
 939        }
 940
 941        DECODE_TAIL;
 942}
 943
 944static __be32
 945nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 946{
 947        DECODE_HEAD;
 948                    
 949        status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 950        if (status)
 951                return status;
 952        READ_BUF(4);
 953        READ32(open_conf->oc_seqid);
 954                                                        
 955        DECODE_TAIL;
 956}
 957
 958static __be32
 959nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 960{
 961        DECODE_HEAD;
 962                    
 963        status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 964        if (status)
 965                return status;
 966        READ_BUF(4);
 967        READ32(open_down->od_seqid);
 968        status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 969                                           &open_down->od_deleg_want, NULL);
 970        if (status)
 971                return status;
 972        status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 973        if (status)
 974                return status;
 975        DECODE_TAIL;
 976}
 977
 978static __be32
 979nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 980{
 981        DECODE_HEAD;
 982
 983        READ_BUF(4);
 984        READ32(putfh->pf_fhlen);
 985        if (putfh->pf_fhlen > NFS4_FHSIZE)
 986                goto xdr_error;
 987        READ_BUF(putfh->pf_fhlen);
 988        SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 989
 990        DECODE_TAIL;
 991}
 992
 993static __be32
 994nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 995{
 996        DECODE_HEAD;
 997
 998        status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 999        if (status)
1000                return status;
1001        READ_BUF(12);
1002        READ64(read->rd_offset);
1003        READ32(read->rd_length);
1004
1005        DECODE_TAIL;
1006}
1007
1008static __be32
1009nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1010{
1011        DECODE_HEAD;
1012
1013        READ_BUF(24);
1014        READ64(readdir->rd_cookie);
1015        COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1016        READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
1017        READ32(readdir->rd_maxcount);
1018        if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1019                goto out;
1020
1021        DECODE_TAIL;
1022}
1023
1024static __be32
1025nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1026{
1027        DECODE_HEAD;
1028
1029        READ_BUF(4);
1030        READ32(remove->rm_namelen);
1031        READ_BUF(remove->rm_namelen);
1032        SAVEMEM(remove->rm_name, remove->rm_namelen);
1033        if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1034                return status;
1035
1036        DECODE_TAIL;
1037}
1038
1039static __be32
1040nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1041{
1042        DECODE_HEAD;
1043
1044        READ_BUF(4);
1045        READ32(rename->rn_snamelen);
1046        READ_BUF(rename->rn_snamelen + 4);
1047        SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1048        READ32(rename->rn_tnamelen);
1049        READ_BUF(rename->rn_tnamelen);
1050        SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1051        if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1052                return status;
1053        if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1054                return status;
1055
1056        DECODE_TAIL;
1057}
1058
1059static __be32
1060nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1061{
1062        DECODE_HEAD;
1063
1064        READ_BUF(sizeof(clientid_t));
1065        COPYMEM(clientid, sizeof(clientid_t));
1066
1067        DECODE_TAIL;
1068}
1069
1070static __be32
1071nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1072                     struct nfsd4_secinfo *secinfo)
1073{
1074        DECODE_HEAD;
1075
1076        READ_BUF(4);
1077        READ32(secinfo->si_namelen);
1078        READ_BUF(secinfo->si_namelen);
1079        SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1080        status = check_filename(secinfo->si_name, secinfo->si_namelen);
1081        if (status)
1082                return status;
1083        DECODE_TAIL;
1084}
1085
1086static __be32
1087nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1088                     struct nfsd4_secinfo_no_name *sin)
1089{
1090        DECODE_HEAD;
1091
1092        READ_BUF(4);
1093        READ32(sin->sin_style);
1094        DECODE_TAIL;
1095}
1096
1097static __be32
1098nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1099{
1100        __be32 status;
1101
1102        status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1103        if (status)
1104                return status;
1105        return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1106                                  &setattr->sa_acl, &setattr->sa_label);
1107}
1108
1109static __be32
1110nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1111{
1112        DECODE_HEAD;
1113
1114        READ_BUF(NFS4_VERIFIER_SIZE);
1115        COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1116
1117        status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1118        if (status)
1119                return nfserr_bad_xdr;
1120        READ_BUF(8);
1121        READ32(setclientid->se_callback_prog);
1122        READ32(setclientid->se_callback_netid_len);
1123
1124        READ_BUF(setclientid->se_callback_netid_len + 4);
1125        SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1126        READ32(setclientid->se_callback_addr_len);
1127
1128        READ_BUF(setclientid->se_callback_addr_len + 4);
1129        SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1130        READ32(setclientid->se_callback_ident);
1131
1132        DECODE_TAIL;
1133}
1134
1135static __be32
1136nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1137{
1138        DECODE_HEAD;
1139
1140        READ_BUF(8 + NFS4_VERIFIER_SIZE);
1141        COPYMEM(&scd_c->sc_clientid, 8);
1142        COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1143
1144        DECODE_TAIL;
1145}
1146
1147/* Also used for NVERIFY */
1148static __be32
1149nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1150{
1151        DECODE_HEAD;
1152
1153        if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1154                goto out;
1155
1156        /* For convenience's sake, we compare raw xdr'd attributes in
1157         * nfsd4_proc_verify */
1158
1159        READ_BUF(4);
1160        READ32(verify->ve_attrlen);
1161        READ_BUF(verify->ve_attrlen);
1162        SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1163
1164        DECODE_TAIL;
1165}
1166
1167static __be32
1168nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1169{
1170        int avail;
1171        int len;
1172        DECODE_HEAD;
1173
1174        status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1175        if (status)
1176                return status;
1177        READ_BUF(16);
1178        READ64(write->wr_offset);
1179        READ32(write->wr_stable_how);
1180        if (write->wr_stable_how > 2)
1181                goto xdr_error;
1182        READ32(write->wr_buflen);
1183
1184        /* Sorry .. no magic macros for this.. *
1185         * READ_BUF(write->wr_buflen);
1186         * SAVEMEM(write->wr_buf, write->wr_buflen);
1187         */
1188        avail = (char*)argp->end - (char*)argp->p;
1189        if (avail + argp->pagelen < write->wr_buflen) {
1190                dprintk("NFSD: xdr error (%s:%d)\n",
1191                                __FILE__, __LINE__);
1192                goto xdr_error;
1193        }
1194        write->wr_head.iov_base = p;
1195        write->wr_head.iov_len = avail;
1196        WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1197        write->wr_pagelist = argp->pagelist;
1198
1199        len = XDR_QUADLEN(write->wr_buflen) << 2;
1200        if (len >= avail) {
1201                int pages;
1202
1203                len -= avail;
1204
1205                pages = len >> PAGE_SHIFT;
1206                argp->pagelist += pages;
1207                argp->pagelen -= pages * PAGE_SIZE;
1208                len -= pages * PAGE_SIZE;
1209
1210                argp->p = (__be32 *)page_address(argp->pagelist[0]);
1211                argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1212        }
1213        argp->p += XDR_QUADLEN(len);
1214
1215        DECODE_TAIL;
1216}
1217
1218static __be32
1219nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1220{
1221        DECODE_HEAD;
1222
1223        READ_BUF(12);
1224        COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1225        READ32(rlockowner->rl_owner.len);
1226        READ_BUF(rlockowner->rl_owner.len);
1227        READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1228
1229        if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1230                return nfserr_inval;
1231        DECODE_TAIL;
1232}
1233
1234static __be32
1235nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1236                         struct nfsd4_exchange_id *exid)
1237{
1238        int dummy, tmp;
1239        DECODE_HEAD;
1240
1241        READ_BUF(NFS4_VERIFIER_SIZE);
1242        COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1243
1244        status = nfsd4_decode_opaque(argp, &exid->clname);
1245        if (status)
1246                return nfserr_bad_xdr;
1247
1248        READ_BUF(4);
1249        READ32(exid->flags);
1250
1251        /* Ignore state_protect4_a */
1252        READ_BUF(4);
1253        READ32(exid->spa_how);
1254        switch (exid->spa_how) {
1255        case SP4_NONE:
1256                break;
1257        case SP4_MACH_CRED:
1258                /* spo_must_enforce */
1259                READ_BUF(4);
1260                READ32(dummy);
1261                READ_BUF(dummy * 4);
1262                p += dummy;
1263
1264                /* spo_must_allow */
1265                READ_BUF(4);
1266                READ32(dummy);
1267                READ_BUF(dummy * 4);
1268                p += dummy;
1269                break;
1270        case SP4_SSV:
1271                /* ssp_ops */
1272                READ_BUF(4);
1273                READ32(dummy);
1274                READ_BUF(dummy * 4);
1275                p += dummy;
1276
1277                READ_BUF(4);
1278                READ32(dummy);
1279                READ_BUF(dummy * 4);
1280                p += dummy;
1281
1282                /* ssp_hash_algs<> */
1283                READ_BUF(4);
1284                READ32(tmp);
1285                while (tmp--) {
1286                        READ_BUF(4);
1287                        READ32(dummy);
1288                        READ_BUF(dummy);
1289                        p += XDR_QUADLEN(dummy);
1290                }
1291
1292                /* ssp_encr_algs<> */
1293                READ_BUF(4);
1294                READ32(tmp);
1295                while (tmp--) {
1296                        READ_BUF(4);
1297                        READ32(dummy);
1298                        READ_BUF(dummy);
1299                        p += XDR_QUADLEN(dummy);
1300                }
1301
1302                /* ssp_window and ssp_num_gss_handles */
1303                READ_BUF(8);
1304                READ32(dummy);
1305                READ32(dummy);
1306                break;
1307        default:
1308                goto xdr_error;
1309        }
1310
1311        /* Ignore Implementation ID */
1312        READ_BUF(4);    /* nfs_impl_id4 array length */
1313        READ32(dummy);
1314
1315        if (dummy > 1)
1316                goto xdr_error;
1317
1318        if (dummy == 1) {
1319                /* nii_domain */
1320                READ_BUF(4);
1321                READ32(dummy);
1322                READ_BUF(dummy);
1323                p += XDR_QUADLEN(dummy);
1324
1325                /* nii_name */
1326                READ_BUF(4);
1327                READ32(dummy);
1328                READ_BUF(dummy);
1329                p += XDR_QUADLEN(dummy);
1330
1331                /* nii_date */
1332                READ_BUF(12);
1333                p += 3;
1334        }
1335        DECODE_TAIL;
1336}
1337
1338static __be32
1339nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1340                            struct nfsd4_create_session *sess)
1341{
1342        DECODE_HEAD;
1343        u32 dummy;
1344
1345        READ_BUF(16);
1346        COPYMEM(&sess->clientid, 8);
1347        READ32(sess->seqid);
1348        READ32(sess->flags);
1349
1350        /* Fore channel attrs */
1351        READ_BUF(28);
1352        READ32(dummy); /* headerpadsz is always 0 */
1353        READ32(sess->fore_channel.maxreq_sz);
1354        READ32(sess->fore_channel.maxresp_sz);
1355        READ32(sess->fore_channel.maxresp_cached);
1356        READ32(sess->fore_channel.maxops);
1357        READ32(sess->fore_channel.maxreqs);
1358        READ32(sess->fore_channel.nr_rdma_attrs);
1359        if (sess->fore_channel.nr_rdma_attrs == 1) {
1360                READ_BUF(4);
1361                READ32(sess->fore_channel.rdma_attrs);
1362        } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1363                dprintk("Too many fore channel attr bitmaps!\n");
1364                goto xdr_error;
1365        }
1366
1367        /* Back channel attrs */
1368        READ_BUF(28);
1369        READ32(dummy); /* headerpadsz is always 0 */
1370        READ32(sess->back_channel.maxreq_sz);
1371        READ32(sess->back_channel.maxresp_sz);
1372        READ32(sess->back_channel.maxresp_cached);
1373        READ32(sess->back_channel.maxops);
1374        READ32(sess->back_channel.maxreqs);
1375        READ32(sess->back_channel.nr_rdma_attrs);
1376        if (sess->back_channel.nr_rdma_attrs == 1) {
1377                READ_BUF(4);
1378                READ32(sess->back_channel.rdma_attrs);
1379        } else if (sess->back_channel.nr_rdma_attrs > 1) {
1380                dprintk("Too many back channel attr bitmaps!\n");
1381                goto xdr_error;
1382        }
1383
1384        READ_BUF(4);
1385        READ32(sess->callback_prog);
1386        nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1387        DECODE_TAIL;
1388}
1389
1390static __be32
1391nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1392                             struct nfsd4_destroy_session *destroy_session)
1393{
1394        DECODE_HEAD;
1395        READ_BUF(NFS4_MAX_SESSIONID_LEN);
1396        COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1397
1398        DECODE_TAIL;
1399}
1400
1401static __be32
1402nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1403                          struct nfsd4_free_stateid *free_stateid)
1404{
1405        DECODE_HEAD;
1406
1407        READ_BUF(sizeof(stateid_t));
1408        READ32(free_stateid->fr_stateid.si_generation);
1409        COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1410
1411        DECODE_TAIL;
1412}
1413
1414static __be32
1415nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1416                      struct nfsd4_sequence *seq)
1417{
1418        DECODE_HEAD;
1419
1420        READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1421        COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1422        READ32(seq->seqid);
1423        READ32(seq->slotid);
1424        READ32(seq->maxslots);
1425        READ32(seq->cachethis);
1426
1427        DECODE_TAIL;
1428}
1429
1430static __be32
1431nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1432{
1433        int i;
1434        __be32 *p, status;
1435        struct nfsd4_test_stateid_id *stateid;
1436
1437        READ_BUF(4);
1438        test_stateid->ts_num_ids = ntohl(*p++);
1439
1440        INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1441
1442        for (i = 0; i < test_stateid->ts_num_ids; i++) {
1443                stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1444                if (!stateid) {
1445                        status = nfserrno(-ENOMEM);
1446                        goto out;
1447                }
1448
1449                defer_free(argp, kfree, stateid);
1450                INIT_LIST_HEAD(&stateid->ts_id_list);
1451                list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1452
1453                status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1454                if (status)
1455                        goto out;
1456        }
1457
1458        status = 0;
1459out:
1460        return status;
1461xdr_error:
1462        dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1463        status = nfserr_bad_xdr;
1464        goto out;
1465}
1466
1467static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1468{
1469        DECODE_HEAD;
1470
1471        READ_BUF(8);
1472        COPYMEM(&dc->clientid, 8);
1473
1474        DECODE_TAIL;
1475}
1476
1477static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1478{
1479        DECODE_HEAD;
1480
1481        READ_BUF(4);
1482        READ32(rc->rca_one_fs);
1483
1484        DECODE_TAIL;
1485}
1486
1487static __be32
1488nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1489{
1490        return nfs_ok;
1491}
1492
1493static __be32
1494nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1495{
1496        return nfserr_notsupp;
1497}
1498
1499typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1500
1501static nfsd4_dec nfsd4_dec_ops[] = {
1502        [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1503        [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1504        [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1505        [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1506        [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1507        [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1508        [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1509        [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1510        [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1511        [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1512        [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1513        [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1514        [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1515        [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1516        [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1517        [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1518        [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1519        [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1520        [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1521        [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1522        [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1523        [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1524        [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1525        [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1526        [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1527        [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1528        [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1529        [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1530        [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1531        [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1532        [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1533        [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1534        [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1535        [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1536        [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1537        [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1538        [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1539};
1540
1541static nfsd4_dec nfsd41_dec_ops[] = {
1542        [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1543        [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1544        [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1545        [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1546        [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1547        [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1548        [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1549        [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1550        [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1551        [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1552        [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1553        [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1554        [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1555        [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1556        [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1557        [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1558        [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1559        [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1560        [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1561        [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1562        [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1563        [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1564        [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1565        [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1566        [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1567        [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1568        [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1569        [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1570        [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1571        [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1572        [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1573        [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1574        [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1575        [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1576        [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1577        [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1578        [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1579
1580        /* new operations for NFSv4.1 */
1581        [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1582        [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1583        [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1584        [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1585        [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1586        [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1587        [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1588        [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1589        [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1590        [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1591        [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1592        [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1593        [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1594        [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1595        [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1596        [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1597        [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1598        [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1599        [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1600};
1601
1602struct nfsd4_minorversion_ops {
1603        nfsd4_dec *decoders;
1604        int nops;
1605};
1606
1607static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1608        [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1609        [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1610        [2] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1611};
1612
1613static __be32
1614nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1615{
1616        DECODE_HEAD;
1617        struct nfsd4_op *op;
1618        struct nfsd4_minorversion_ops *ops;
1619        bool cachethis = false;
1620        int i;
1621
1622        READ_BUF(4);
1623        READ32(argp->taglen);
1624        READ_BUF(argp->taglen + 8);
1625        SAVEMEM(argp->tag, argp->taglen);
1626        READ32(argp->minorversion);
1627        READ32(argp->opcnt);
1628
1629        if (argp->taglen > NFSD4_MAX_TAGLEN)
1630                goto xdr_error;
1631        if (argp->opcnt > 100)
1632                goto xdr_error;
1633
1634        if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1635                argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1636                if (!argp->ops) {
1637                        argp->ops = argp->iops;
1638                        dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1639                        goto xdr_error;
1640                }
1641        }
1642
1643        if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1644                argp->opcnt = 0;
1645
1646        ops = &nfsd4_minorversion[argp->minorversion];
1647        for (i = 0; i < argp->opcnt; i++) {
1648                op = &argp->ops[i];
1649                op->replay = NULL;
1650
1651                READ_BUF(4);
1652                READ32(op->opnum);
1653
1654                if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1655                        op->status = ops->decoders[op->opnum](argp, &op->u);
1656                else {
1657                        op->opnum = OP_ILLEGAL;
1658                        op->status = nfserr_op_illegal;
1659                }
1660
1661                if (op->status) {
1662                        argp->opcnt = i+1;
1663                        break;
1664                }
1665                /*
1666                 * We'll try to cache the result in the DRC if any one
1667                 * op in the compound wants to be cached:
1668                 */
1669                cachethis |= nfsd4_cache_this_op(op);
1670        }
1671        /* Sessions make the DRC unnecessary: */
1672        if (argp->minorversion)
1673                cachethis = false;
1674        argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1675
1676        DECODE_TAIL;
1677}
1678
1679#define WRITE32(n)               *p++ = htonl(n)
1680#define WRITE64(n)               do {                           \
1681        *p++ = htonl((u32)((n) >> 32));                         \
1682        *p++ = htonl((u32)(n));                                 \
1683} while (0)
1684#define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1685        *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1686        memcpy(p, ptr, nbytes);                                 \
1687        p += XDR_QUADLEN(nbytes);                               \
1688}} while (0)
1689
1690static void write32(__be32 **p, u32 n)
1691{
1692        *(*p)++ = htonl(n);
1693}
1694
1695static void write64(__be32 **p, u64 n)
1696{
1697        write32(p, (n >> 32));
1698        write32(p, (u32)n);
1699}
1700
1701static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1702{
1703        if (IS_I_VERSION(inode)) {
1704                write64(p, inode->i_version);
1705        } else {
1706                write32(p, stat->ctime.tv_sec);
1707                write32(p, stat->ctime.tv_nsec);
1708        }
1709}
1710
1711static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1712{
1713        write32(p, c->atomic);
1714        if (c->change_supported) {
1715                write64(p, c->before_change);
1716                write64(p, c->after_change);
1717        } else {
1718                write32(p, c->before_ctime_sec);
1719                write32(p, c->before_ctime_nsec);
1720                write32(p, c->after_ctime_sec);
1721                write32(p, c->after_ctime_nsec);
1722        }
1723}
1724
1725#define RESERVE_SPACE(nbytes)   do {                            \
1726        p = resp->p;                                            \
1727        BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1728} while (0)
1729#define ADJUST_ARGS()           resp->p = p
1730
1731/* Encode as an array of strings the string given with components
1732 * separated @sep, escaped with esc_enter and esc_exit.
1733 */
1734static __be32 nfsd4_encode_components_esc(char sep, char *components,
1735                                   __be32 **pp, int *buflen,
1736                                   char esc_enter, char esc_exit)
1737{
1738        __be32 *p = *pp;
1739        __be32 *countp = p;
1740        int strlen, count=0;
1741        char *str, *end, *next;
1742
1743        dprintk("nfsd4_encode_components(%s)\n", components);
1744        if ((*buflen -= 4) < 0)
1745                return nfserr_resource;
1746        WRITE32(0); /* We will fill this in with @count later */
1747        end = str = components;
1748        while (*end) {
1749                bool found_esc = false;
1750
1751                /* try to parse as esc_start, ..., esc_end, sep */
1752                if (*str == esc_enter) {
1753                        for (; *end && (*end != esc_exit); end++)
1754                                /* find esc_exit or end of string */;
1755                        next = end + 1;
1756                        if (*end && (!*next || *next == sep)) {
1757                                str++;
1758                                found_esc = true;
1759                        }
1760                }
1761
1762                if (!found_esc)
1763                        for (; *end && (*end != sep); end++)
1764                                /* find sep or end of string */;
1765
1766                strlen = end - str;
1767                if (strlen) {
1768                        if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1769                                return nfserr_resource;
1770                        WRITE32(strlen);
1771                        WRITEMEM(str, strlen);
1772                        count++;
1773                }
1774                else
1775                        end++;
1776                str = end;
1777        }
1778        *pp = p;
1779        p = countp;
1780        WRITE32(count);
1781        return 0;
1782}
1783
1784/* Encode as an array of strings the string given with components
1785 * separated @sep.
1786 */
1787static __be32 nfsd4_encode_components(char sep, char *components,
1788                                   __be32 **pp, int *buflen)
1789{
1790        return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1791}
1792
1793/*
1794 * encode a location element of a fs_locations structure
1795 */
1796static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1797                                    __be32 **pp, int *buflen)
1798{
1799        __be32 status;
1800        __be32 *p = *pp;
1801
1802        status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1803                                                '[', ']');
1804        if (status)
1805                return status;
1806        status = nfsd4_encode_components('/', location->path, &p, buflen);
1807        if (status)
1808                return status;
1809        *pp = p;
1810        return 0;
1811}
1812
1813/*
1814 * Encode a path in RFC3530 'pathname4' format
1815 */
1816static __be32 nfsd4_encode_path(const struct path *root,
1817                const struct path *path, __be32 **pp, int *buflen)
1818{
1819        struct path cur = {
1820                .mnt = path->mnt,
1821                .dentry = path->dentry,
1822        };
1823        __be32 *p = *pp;
1824        struct dentry **components = NULL;
1825        unsigned int ncomponents = 0;
1826        __be32 err = nfserr_jukebox;
1827
1828        dprintk("nfsd4_encode_components(");
1829
1830        path_get(&cur);
1831        /* First walk the path up to the nfsd root, and store the
1832         * dentries/path components in an array.
1833         */
1834        for (;;) {
1835                if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1836                        break;
1837                if (cur.dentry == cur.mnt->mnt_root) {
1838                        if (follow_up(&cur))
1839                                continue;
1840                        goto out_free;
1841                }
1842                if ((ncomponents & 15) == 0) {
1843                        struct dentry **new;
1844                        new = krealloc(components,
1845                                        sizeof(*new) * (ncomponents + 16),
1846                                        GFP_KERNEL);
1847                        if (!new)
1848                                goto out_free;
1849                        components = new;
1850                }
1851                components[ncomponents++] = cur.dentry;
1852                cur.dentry = dget_parent(cur.dentry);
1853        }
1854
1855        *buflen -= 4;
1856        if (*buflen < 0)
1857                goto out_free;
1858        WRITE32(ncomponents);
1859
1860        while (ncomponents) {
1861                struct dentry *dentry = components[ncomponents - 1];
1862                unsigned int len = dentry->d_name.len;
1863
1864                *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1865                if (*buflen < 0)
1866                        goto out_free;
1867                WRITE32(len);
1868                WRITEMEM(dentry->d_name.name, len);
1869                dprintk("/%s", dentry->d_name.name);
1870                dput(dentry);
1871                ncomponents--;
1872        }
1873
1874        *pp = p;
1875        err = 0;
1876out_free:
1877        dprintk(")\n");
1878        while (ncomponents)
1879                dput(components[--ncomponents]);
1880        kfree(components);
1881        path_put(&cur);
1882        return err;
1883}
1884
1885static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1886                const struct path *path, __be32 **pp, int *buflen)
1887{
1888        struct svc_export *exp_ps;
1889        __be32 res;
1890
1891        exp_ps = rqst_find_fsidzero_export(rqstp);
1892        if (IS_ERR(exp_ps))
1893                return nfserrno(PTR_ERR(exp_ps));
1894        res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1895        exp_put(exp_ps);
1896        return res;
1897}
1898
1899/*
1900 *  encode a fs_locations structure
1901 */
1902static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1903                                     struct svc_export *exp,
1904                                     __be32 **pp, int *buflen)
1905{
1906        __be32 status;
1907        int i;
1908        __be32 *p = *pp;
1909        struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1910
1911        status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1912        if (status)
1913                return status;
1914        if ((*buflen -= 4) < 0)
1915                return nfserr_resource;
1916        WRITE32(fslocs->locations_count);
1917        for (i=0; i<fslocs->locations_count; i++) {
1918                status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1919                                                   &p, buflen);
1920                if (status)
1921                        return status;
1922        }
1923        *pp = p;
1924        return 0;
1925}
1926
1927static u32 nfs4_file_type(umode_t mode)
1928{
1929        switch (mode & S_IFMT) {
1930        case S_IFIFO:   return NF4FIFO;
1931        case S_IFCHR:   return NF4CHR;
1932        case S_IFDIR:   return NF4DIR;
1933        case S_IFBLK:   return NF4BLK;
1934        case S_IFLNK:   return NF4LNK;
1935        case S_IFREG:   return NF4REG;
1936        case S_IFSOCK:  return NF4SOCK;
1937        default:        return NF4BAD;
1938        };
1939}
1940
1941static __be32
1942nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1943                        __be32 **p, int *buflen)
1944{
1945        int status;
1946
1947        if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1948                return nfserr_resource;
1949        if (whotype != NFS4_ACL_WHO_NAMED)
1950                status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1951        else if (gid_valid(gid))
1952                status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1953        else
1954                status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1955        if (status < 0)
1956                return nfserrno(status);
1957        *p = xdr_encode_opaque(*p, NULL, status);
1958        *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1959        BUG_ON(*buflen < 0);
1960        return 0;
1961}
1962
1963static inline __be32
1964nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1965{
1966        return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1967                                 p, buflen);
1968}
1969
1970static inline __be32
1971nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1972{
1973        return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
1974                                 p, buflen);
1975}
1976
1977static inline __be32
1978nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1979                __be32 **p, int *buflen)
1980{
1981        kuid_t uid = INVALID_UID;
1982        kgid_t gid = INVALID_GID;
1983
1984        if (ace->whotype == NFS4_ACL_WHO_NAMED) {
1985                if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1986                        gid = ace->who_gid;
1987                else
1988                        uid = ace->who_uid;
1989        }
1990        return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
1991}
1992
1993#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1994                              FATTR4_WORD0_RDATTR_ERROR)
1995#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1996
1997#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1998static inline __be32
1999nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2000{
2001        __be32 *p = *pp;
2002
2003        if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4))
2004                return nfserr_resource;
2005
2006        /*
2007         * For now we use a 0 here to indicate the null translation; in
2008         * the future we may place a call to translation code here.
2009         */
2010        if ((*buflen -= 8) < 0)
2011                return nfserr_resource;
2012
2013        WRITE32(0); /* lfs */
2014        WRITE32(0); /* pi */
2015        p = xdr_encode_opaque(p, context, len);
2016        *buflen -= (XDR_QUADLEN(len) << 2) + 4;
2017
2018        *pp = p;
2019        return 0;
2020}
2021#else
2022static inline __be32
2023nfsd4_encode_security_label(struct svc_rqst *rqstp, void *context, int len, __be32 **pp, int *buflen)
2024{ return 0; }
2025#endif
2026
2027static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2028{
2029        /* As per referral draft:  */
2030        if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2031            *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2032                if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2033                    *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2034                        *rdattr_err = NFSERR_MOVED;
2035                else
2036                        return nfserr_moved;
2037        }
2038        *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2039        *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2040        return 0;
2041}
2042
2043
2044static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2045{
2046        struct path path = exp->ex_path;
2047        int err;
2048
2049        path_get(&path);
2050        while (follow_up(&path)) {
2051                if (path.dentry != path.mnt->mnt_root)
2052                        break;
2053        }
2054        err = vfs_getattr(&path, stat);
2055        path_put(&path);
2056        return err;
2057}
2058
2059/*
2060 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2061 * ourselves.
2062 *
2063 * countp is the buffer size in _words_
2064 */
2065__be32
2066nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2067                struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
2068                struct svc_rqst *rqstp, int ignore_crossmnt)
2069{
2070        u32 bmval0 = bmval[0];
2071        u32 bmval1 = bmval[1];
2072        u32 bmval2 = bmval[2];
2073        struct kstat stat;
2074        struct svc_fh tempfh;
2075        struct kstatfs statfs;
2076        int buflen = count << 2;
2077        __be32 *attrlenp;
2078        u32 dummy;
2079        u64 dummy64;
2080        u32 rdattr_err = 0;
2081        __be32 *p = *buffer;
2082        __be32 status;
2083        int err;
2084        int aclsupport = 0;
2085        struct nfs4_acl *acl = NULL;
2086        void *context = NULL;
2087        int contextlen;
2088        bool contextsupport = false;
2089        struct nfsd4_compoundres *resp = rqstp->rq_resp;
2090        u32 minorversion = resp->cstate.minorversion;
2091        struct path path = {
2092                .mnt    = exp->ex_path.mnt,
2093                .dentry = dentry,
2094        };
2095        struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2096
2097        BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2098        BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2099        BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2100        BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2101
2102        if (exp->ex_fslocs.migrated) {
2103                BUG_ON(bmval[2]);
2104                status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2105                if (status)
2106                        goto out;
2107        }
2108
2109        err = vfs_getattr(&path, &stat);
2110        if (err)
2111                goto out_nfserr;
2112        if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2113                        FATTR4_WORD0_MAXNAME)) ||
2114            (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2115                       FATTR4_WORD1_SPACE_TOTAL))) {
2116                err = vfs_statfs(&path, &statfs);
2117                if (err)
2118                        goto out_nfserr;
2119        }
2120        if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2121                fh_init(&tempfh, NFS4_FHSIZE);
2122                status = fh_compose(&tempfh, exp, dentry, NULL);
2123                if (status)
2124                        goto out;
2125                fhp = &tempfh;
2126        }
2127        if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2128                        | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2129                err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2130                aclsupport = (err == 0);
2131                if (bmval0 & FATTR4_WORD0_ACL) {
2132                        if (err == -EOPNOTSUPP)
2133                                bmval0 &= ~FATTR4_WORD0_ACL;
2134                        else if (err == -EINVAL) {
2135                                status = nfserr_attrnotsupp;
2136                                goto out;
2137                        } else if (err != 0)
2138                                goto out_nfserr;
2139                }
2140        }
2141
2142#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2143        if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2144                        bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2145                err = security_inode_getsecctx(dentry->d_inode,
2146                                                &context, &contextlen);
2147                contextsupport = (err == 0);
2148                if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2149                        if (err == -EOPNOTSUPP)
2150                                bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2151                        else if (err)
2152                                goto out_nfserr;
2153                }
2154        }
2155#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2156
2157        if (bmval2) {
2158                if ((buflen -= 16) < 0)
2159                        goto out_resource;
2160                WRITE32(3);
2161                WRITE32(bmval0);
2162                WRITE32(bmval1);
2163                WRITE32(bmval2);
2164        } else if (bmval1) {
2165                if ((buflen -= 12) < 0)
2166                        goto out_resource;
2167                WRITE32(2);
2168                WRITE32(bmval0);
2169                WRITE32(bmval1);
2170        } else {
2171                if ((buflen -= 8) < 0)
2172                        goto out_resource;
2173                WRITE32(1);
2174                WRITE32(bmval0);
2175        }
2176        attrlenp = p++;                /* to be backfilled later */
2177
2178        if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2179                u32 word0 = nfsd_suppattrs0(minorversion);
2180                u32 word1 = nfsd_suppattrs1(minorversion);
2181                u32 word2 = nfsd_suppattrs2(minorversion);
2182
2183                if (!aclsupport)
2184                        word0 &= ~FATTR4_WORD0_ACL;
2185                if (!contextsupport)
2186                        word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2187                if (!word2) {
2188                        if ((buflen -= 12) < 0)
2189                                goto out_resource;
2190                        WRITE32(2);
2191                        WRITE32(word0);
2192                        WRITE32(word1);
2193                } else {
2194                        if ((buflen -= 16) < 0)
2195                                goto out_resource;
2196                        WRITE32(3);
2197                        WRITE32(word0);
2198                        WRITE32(word1);
2199                        WRITE32(word2);
2200                }
2201        }
2202        if (bmval0 & FATTR4_WORD0_TYPE) {
2203                if ((buflen -= 4) < 0)
2204                        goto out_resource;
2205                dummy = nfs4_file_type(stat.mode);
2206                if (dummy == NF4BAD)
2207                        goto out_serverfault;
2208                WRITE32(dummy);
2209        }
2210        if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2211                if ((buflen -= 4) < 0)
2212                        goto out_resource;
2213                if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2214                        WRITE32(NFS4_FH_PERSISTENT);
2215                else
2216                        WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2217        }
2218        if (bmval0 & FATTR4_WORD0_CHANGE) {
2219                if ((buflen -= 8) < 0)
2220                        goto out_resource;
2221                write_change(&p, &stat, dentry->d_inode);
2222        }
2223        if (bmval0 & FATTR4_WORD0_SIZE) {
2224                if ((buflen -= 8) < 0)
2225                        goto out_resource;
2226                WRITE64(stat.size);
2227        }
2228        if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2229                if ((buflen -= 4) < 0)
2230                        goto out_resource;
2231                WRITE32(1);
2232        }
2233        if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2234                if ((buflen -= 4) < 0)
2235                        goto out_resource;
2236                WRITE32(1);
2237        }
2238        if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2239                if ((buflen -= 4) < 0)
2240                        goto out_resource;
2241                WRITE32(0);
2242        }
2243        if (bmval0 & FATTR4_WORD0_FSID) {
2244                if ((buflen -= 16) < 0)
2245                        goto out_resource;
2246                if (exp->ex_fslocs.migrated) {
2247                        WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2248                        WRITE64(NFS4_REFERRAL_FSID_MINOR);
2249                } else switch(fsid_source(fhp)) {
2250                case FSIDSOURCE_FSID:
2251                        WRITE64((u64)exp->ex_fsid);
2252                        WRITE64((u64)0);
2253                        break;
2254                case FSIDSOURCE_DEV:
2255                        WRITE32(0);
2256                        WRITE32(MAJOR(stat.dev));
2257                        WRITE32(0);
2258                        WRITE32(MINOR(stat.dev));
2259                        break;
2260                case FSIDSOURCE_UUID:
2261                        WRITEMEM(exp->ex_uuid, 16);
2262                        break;
2263                }
2264        }
2265        if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2266                if ((buflen -= 4) < 0)
2267                        goto out_resource;
2268                WRITE32(0);
2269        }
2270        if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2271                if ((buflen -= 4) < 0)
2272                        goto out_resource;
2273                WRITE32(nn->nfsd4_lease);
2274        }
2275        if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2276                if ((buflen -= 4) < 0)
2277                        goto out_resource;
2278                WRITE32(rdattr_err);
2279        }
2280        if (bmval0 & FATTR4_WORD0_ACL) {
2281                struct nfs4_ace *ace;
2282
2283                if (acl == NULL) {
2284                        if ((buflen -= 4) < 0)
2285                                goto out_resource;
2286
2287                        WRITE32(0);
2288                        goto out_acl;
2289                }
2290                if ((buflen -= 4) < 0)
2291                        goto out_resource;
2292                WRITE32(acl->naces);
2293
2294                for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2295                        if ((buflen -= 4*3) < 0)
2296                                goto out_resource;
2297                        WRITE32(ace->type);
2298                        WRITE32(ace->flag);
2299                        WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2300                        status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2301                        if (status == nfserr_resource)
2302                                goto out_resource;
2303                        if (status)
2304                                goto out;
2305                }
2306        }
2307out_acl:
2308        if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2309                if ((buflen -= 4) < 0)
2310                        goto out_resource;
2311                WRITE32(aclsupport ?
2312                        ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2313        }
2314        if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2315                if ((buflen -= 4) < 0)
2316                        goto out_resource;
2317                WRITE32(1);
2318        }
2319        if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2320                if ((buflen -= 4) < 0)
2321                        goto out_resource;
2322                WRITE32(0);
2323        }
2324        if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2325                if ((buflen -= 4) < 0)
2326                        goto out_resource;
2327                WRITE32(1);
2328        }
2329        if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2330                if ((buflen -= 4) < 0)
2331                        goto out_resource;
2332                WRITE32(1);
2333        }
2334        if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2335                buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2336                if (buflen < 0)
2337                        goto out_resource;
2338                WRITE32(fhp->fh_handle.fh_size);
2339                WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2340        }
2341        if (bmval0 & FATTR4_WORD0_FILEID) {
2342                if ((buflen -= 8) < 0)
2343                        goto out_resource;
2344                WRITE64(stat.ino);
2345        }
2346        if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2347                if ((buflen -= 8) < 0)
2348                        goto out_resource;
2349                WRITE64((u64) statfs.f_ffree);
2350        }
2351        if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2352                if ((buflen -= 8) < 0)
2353                        goto out_resource;
2354                WRITE64((u64) statfs.f_ffree);
2355        }
2356        if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2357                if ((buflen -= 8) < 0)
2358                        goto out_resource;
2359                WRITE64((u64) statfs.f_files);
2360        }
2361        if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2362                status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2363                if (status == nfserr_resource)
2364                        goto out_resource;
2365                if (status)
2366                        goto out;
2367        }
2368        if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2369                if ((buflen -= 4) < 0)
2370                        goto out_resource;
2371                WRITE32(1);
2372        }
2373        if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2374                if ((buflen -= 8) < 0)
2375                        goto out_resource;
2376                WRITE64(~(u64)0);
2377        }
2378        if (bmval0 & FATTR4_WORD0_MAXLINK) {
2379                if ((buflen -= 4) < 0)
2380                        goto out_resource;
2381                WRITE32(255);
2382        }
2383        if (bmval0 & FATTR4_WORD0_MAXNAME) {
2384                if ((buflen -= 4) < 0)
2385                        goto out_resource;
2386                WRITE32(statfs.f_namelen);
2387        }
2388        if (bmval0 & FATTR4_WORD0_MAXREAD) {
2389                if ((buflen -= 8) < 0)
2390                        goto out_resource;
2391                WRITE64((u64) svc_max_payload(rqstp));
2392        }
2393        if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2394                if ((buflen -= 8) < 0)
2395                        goto out_resource;
2396                WRITE64((u64) svc_max_payload(rqstp));
2397        }
2398        if (bmval1 & FATTR4_WORD1_MODE) {
2399                if ((buflen -= 4) < 0)
2400                        goto out_resource;
2401                WRITE32(stat.mode & S_IALLUGO);
2402        }
2403        if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2404                if ((buflen -= 4) < 0)
2405                        goto out_resource;
2406                WRITE32(1);
2407        }
2408        if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2409                if ((buflen -= 4) < 0)
2410                        goto out_resource;
2411                WRITE32(stat.nlink);
2412        }
2413        if (bmval1 & FATTR4_WORD1_OWNER) {
2414                status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2415                if (status == nfserr_resource)
2416                        goto out_resource;
2417                if (status)
2418                        goto out;
2419        }
2420        if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2421                status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2422                if (status == nfserr_resource)
2423                        goto out_resource;
2424                if (status)
2425                        goto out;
2426        }
2427        if (bmval1 & FATTR4_WORD1_RAWDEV) {
2428                if ((buflen -= 8) < 0)
2429                        goto out_resource;
2430                WRITE32((u32) MAJOR(stat.rdev));
2431                WRITE32((u32) MINOR(stat.rdev));
2432        }
2433        if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2434                if ((buflen -= 8) < 0)
2435                        goto out_resource;
2436                dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2437                WRITE64(dummy64);
2438        }
2439        if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2440                if ((buflen -= 8) < 0)
2441                        goto out_resource;
2442                dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2443                WRITE64(dummy64);
2444        }
2445        if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2446                if ((buflen -= 8) < 0)
2447                        goto out_resource;
2448                dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2449                WRITE64(dummy64);
2450        }
2451        if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2452                if ((buflen -= 8) < 0)
2453                        goto out_resource;
2454                dummy64 = (u64)stat.blocks << 9;
2455                WRITE64(dummy64);
2456        }
2457        if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2458                if ((buflen -= 12) < 0)
2459                        goto out_resource;
2460                WRITE64((s64)stat.atime.tv_sec);
2461                WRITE32(stat.atime.tv_nsec);
2462        }
2463        if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2464                if ((buflen -= 12) < 0)
2465                        goto out_resource;
2466                WRITE32(0);
2467                WRITE32(1);
2468                WRITE32(0);
2469        }
2470        if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2471                if ((buflen -= 12) < 0)
2472                        goto out_resource;
2473                WRITE64((s64)stat.ctime.tv_sec);
2474                WRITE32(stat.ctime.tv_nsec);
2475        }
2476        if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2477                if ((buflen -= 12) < 0)
2478                        goto out_resource;
2479                WRITE64((s64)stat.mtime.tv_sec);
2480                WRITE32(stat.mtime.tv_nsec);
2481        }
2482        if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2483                if ((buflen -= 8) < 0)
2484                        goto out_resource;
2485                /*
2486                 * Get parent's attributes if not ignoring crossmount
2487                 * and this is the root of a cross-mounted filesystem.
2488                 */
2489                if (ignore_crossmnt == 0 &&
2490                    dentry == exp->ex_path.mnt->mnt_root)
2491                        get_parent_attributes(exp, &stat);
2492                WRITE64(stat.ino);
2493        }
2494        if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2495                status = nfsd4_encode_security_label(rqstp, context,
2496                                contextlen, &p, &buflen);
2497                if (status)
2498                        goto out;
2499        }
2500        if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2501                WRITE32(3);
2502                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2503                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2504                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2505        }
2506
2507        *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2508        *buffer = p;
2509        status = nfs_ok;
2510
2511out:
2512#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2513        if (context)
2514                security_release_secctx(context, contextlen);
2515#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2516        kfree(acl);
2517        if (fhp == &tempfh)
2518                fh_put(&tempfh);
2519        return status;
2520out_nfserr:
2521        status = nfserrno(err);
2522        goto out;
2523out_resource:
2524        status = nfserr_resource;
2525        goto out;
2526out_serverfault:
2527        status = nfserr_serverfault;
2528        goto out;
2529}
2530
2531static inline int attributes_need_mount(u32 *bmval)
2532{
2533        if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2534                return 1;
2535        if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2536                return 1;
2537        return 0;
2538}
2539
2540static __be32
2541nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2542                const char *name, int namlen, __be32 **p, int buflen)
2543{
2544        struct svc_export *exp = cd->rd_fhp->fh_export;
2545        struct dentry *dentry;
2546        __be32 nfserr;
2547        int ignore_crossmnt = 0;
2548
2549        dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2550        if (IS_ERR(dentry))
2551                return nfserrno(PTR_ERR(dentry));
2552        if (!dentry->d_inode) {
2553                /*
2554                 * nfsd_buffered_readdir drops the i_mutex between
2555                 * readdir and calling this callback, leaving a window
2556                 * where this directory entry could have gone away.
2557                 */
2558                dput(dentry);
2559                return nfserr_noent;
2560        }
2561
2562        exp_get(exp);
2563        /*
2564         * In the case of a mountpoint, the client may be asking for
2565         * attributes that are only properties of the underlying filesystem
2566         * as opposed to the cross-mounted file system. In such a case,
2567         * we will not follow the cross mount and will fill the attribtutes
2568         * directly from the mountpoint dentry.
2569         */
2570        if (nfsd_mountpoint(dentry, exp)) {
2571                int err;
2572
2573                if (!(exp->ex_flags & NFSEXP_V4ROOT)
2574                                && !attributes_need_mount(cd->rd_bmval)) {
2575                        ignore_crossmnt = 1;
2576                        goto out_encode;
2577                }
2578                /*
2579                 * Why the heck aren't we just using nfsd_lookup??
2580                 * Different "."/".." handling?  Something else?
2581                 * At least, add a comment here to explain....
2582                 */
2583                err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2584                if (err) {
2585                        nfserr = nfserrno(err);
2586                        goto out_put;
2587                }
2588                nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2589                if (nfserr)
2590                        goto out_put;
2591
2592        }
2593out_encode:
2594        nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2595                                        cd->rd_rqstp, ignore_crossmnt);
2596out_put:
2597        dput(dentry);
2598        exp_put(exp);
2599        return nfserr;
2600}
2601
2602static __be32 *
2603nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2604{
2605        __be32 *attrlenp;
2606
2607        if (buflen < 6)
2608                return NULL;
2609        *p++ = htonl(2);
2610        *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2611        *p++ = htonl(0);                         /* bmval1 */
2612
2613        attrlenp = p++;
2614        *p++ = nfserr;       /* no htonl */
2615        *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2616        return p;
2617}
2618
2619static int
2620nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2621                    loff_t offset, u64 ino, unsigned int d_type)
2622{
2623        struct readdir_cd *ccd = ccdv;
2624        struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2625        int buflen;
2626        __be32 *p = cd->buffer;
2627        __be32 *cookiep;
2628        __be32 nfserr = nfserr_toosmall;
2629
2630        /* In nfsv4, "." and ".." never make it onto the wire.. */
2631        if (name && isdotent(name, namlen)) {
2632                cd->common.err = nfs_ok;
2633                return 0;
2634        }
2635
2636        if (cd->offset)
2637                xdr_encode_hyper(cd->offset, (u64) offset);
2638
2639        buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2640        if (buflen < 0)
2641                goto fail;
2642
2643        *p++ = xdr_one;                             /* mark entry present */
2644        cookiep = p;
2645        p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2646        p = xdr_encode_array(p, name, namlen);      /* name length & name */
2647
2648        nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2649        switch (nfserr) {
2650        case nfs_ok:
2651                break;
2652        case nfserr_resource:
2653                nfserr = nfserr_toosmall;
2654                goto fail;
2655        case nfserr_noent:
2656                goto skip_entry;
2657        default:
2658                /*
2659                 * If the client requested the RDATTR_ERROR attribute,
2660                 * we stuff the error code into this attribute
2661                 * and continue.  If this attribute was not requested,
2662                 * then in accordance with the spec, we fail the
2663                 * entire READDIR operation(!)
2664                 */
2665                if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2666                        goto fail;
2667                p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2668                if (p == NULL) {
2669                        nfserr = nfserr_toosmall;
2670                        goto fail;
2671                }
2672        }
2673        cd->buflen -= (p - cd->buffer);
2674        cd->buffer = p;
2675        cd->offset = cookiep;
2676skip_entry:
2677        cd->common.err = nfs_ok;
2678        return 0;
2679fail:
2680        cd->common.err = nfserr;
2681        return -EINVAL;
2682}
2683
2684static void
2685nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2686{
2687        __be32 *p;
2688
2689        RESERVE_SPACE(sizeof(stateid_t));
2690        WRITE32(sid->si_generation);
2691        WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2692        ADJUST_ARGS();
2693}
2694
2695static __be32
2696nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2697{
2698        __be32 *p;
2699
2700        if (!nfserr) {
2701                RESERVE_SPACE(8);
2702                WRITE32(access->ac_supported);
2703                WRITE32(access->ac_resp_access);
2704                ADJUST_ARGS();
2705        }
2706        return nfserr;
2707}
2708
2709static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2710{
2711        __be32 *p;
2712
2713        if (!nfserr) {
2714                RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2715                WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2716                WRITE32(bcts->dir);
2717                /* Sorry, we do not yet support RDMA over 4.1: */
2718                WRITE32(0);
2719                ADJUST_ARGS();
2720        }
2721        return nfserr;
2722}
2723
2724static __be32
2725nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2726{
2727        if (!nfserr)
2728                nfsd4_encode_stateid(resp, &close->cl_stateid);
2729
2730        return nfserr;
2731}
2732
2733
2734static __be32
2735nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2736{
2737        __be32 *p;
2738
2739        if (!nfserr) {
2740                RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2741                WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2742                ADJUST_ARGS();
2743        }
2744        return nfserr;
2745}
2746
2747static __be32
2748nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2749{
2750        __be32 *p;
2751
2752        if (!nfserr) {
2753                RESERVE_SPACE(32);
2754                write_cinfo(&p, &create->cr_cinfo);
2755                WRITE32(2);
2756                WRITE32(create->cr_bmval[0]);
2757                WRITE32(create->cr_bmval[1]);
2758                ADJUST_ARGS();
2759        }
2760        return nfserr;
2761}
2762
2763static __be32
2764nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2765{
2766        struct svc_fh *fhp = getattr->ga_fhp;
2767        int buflen;
2768
2769        if (nfserr)
2770                return nfserr;
2771
2772        buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2773        nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2774                                    &resp->p, buflen, getattr->ga_bmval,
2775                                    resp->rqstp, 0);
2776        return nfserr;
2777}
2778
2779static __be32
2780nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2781{
2782        struct svc_fh *fhp = *fhpp;
2783        unsigned int len;
2784        __be32 *p;
2785
2786        if (!nfserr) {
2787                len = fhp->fh_handle.fh_size;
2788                RESERVE_SPACE(len + 4);
2789                WRITE32(len);
2790                WRITEMEM(&fhp->fh_handle.fh_base, len);
2791                ADJUST_ARGS();
2792        }
2793        return nfserr;
2794}
2795
2796/*
2797* Including all fields other than the name, a LOCK4denied structure requires
2798*   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2799*/
2800static void
2801nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2802{
2803        struct xdr_netobj *conf = &ld->ld_owner;
2804        __be32 *p;
2805
2806        RESERVE_SPACE(32 + XDR_LEN(conf->len));
2807        WRITE64(ld->ld_start);
2808        WRITE64(ld->ld_length);
2809        WRITE32(ld->ld_type);
2810        if (conf->len) {
2811                WRITEMEM(&ld->ld_clientid, 8);
2812                WRITE32(conf->len);
2813                WRITEMEM(conf->data, conf->len);
2814                kfree(conf->data);
2815        }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2816                WRITE64((u64)0); /* clientid */
2817                WRITE32(0); /* length of owner name */
2818        }
2819        ADJUST_ARGS();
2820}
2821
2822static __be32
2823nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2824{
2825        if (!nfserr)
2826                nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2827        else if (nfserr == nfserr_denied)
2828                nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2829
2830        return nfserr;
2831}
2832
2833static __be32
2834nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2835{
2836        if (nfserr == nfserr_denied)
2837                nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2838        return nfserr;
2839}
2840
2841static __be32
2842nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2843{
2844        if (!nfserr)
2845                nfsd4_encode_stateid(resp, &locku->lu_stateid);
2846
2847        return nfserr;
2848}
2849
2850
2851static __be32
2852nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2853{
2854        __be32 *p;
2855
2856        if (!nfserr) {
2857                RESERVE_SPACE(20);
2858                write_cinfo(&p, &link->li_cinfo);
2859                ADJUST_ARGS();
2860        }
2861        return nfserr;
2862}
2863
2864
2865static __be32
2866nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2867{
2868        __be32 *p;
2869
2870        if (nfserr)
2871                goto out;
2872
2873        nfsd4_encode_stateid(resp, &open->op_stateid);
2874        RESERVE_SPACE(40);
2875        write_cinfo(&p, &open->op_cinfo);
2876        WRITE32(open->op_rflags);
2877        WRITE32(2);
2878        WRITE32(open->op_bmval[0]);
2879        WRITE32(open->op_bmval[1]);
2880        WRITE32(open->op_delegate_type);
2881        ADJUST_ARGS();
2882
2883        switch (open->op_delegate_type) {
2884        case NFS4_OPEN_DELEGATE_NONE:
2885                break;
2886        case NFS4_OPEN_DELEGATE_READ:
2887                nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2888                RESERVE_SPACE(20);
2889                WRITE32(open->op_recall);
2890
2891                /*
2892                 * TODO: ACE's in delegations
2893                 */
2894                WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2895                WRITE32(0);
2896                WRITE32(0);
2897                WRITE32(0);   /* XXX: is NULL principal ok? */
2898                ADJUST_ARGS();
2899                break;
2900        case NFS4_OPEN_DELEGATE_WRITE:
2901                nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2902                RESERVE_SPACE(32);
2903                WRITE32(0);
2904
2905                /*
2906                 * TODO: space_limit's in delegations
2907                 */
2908                WRITE32(NFS4_LIMIT_SIZE);
2909                WRITE32(~(u32)0);
2910                WRITE32(~(u32)0);
2911
2912                /*
2913                 * TODO: ACE's in delegations
2914                 */
2915                WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2916                WRITE32(0);
2917                WRITE32(0);
2918                WRITE32(0);   /* XXX: is NULL principal ok? */
2919                ADJUST_ARGS();
2920                break;
2921        case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2922                switch (open->op_why_no_deleg) {
2923                case WND4_CONTENTION:
2924                case WND4_RESOURCE:
2925                        RESERVE_SPACE(8);
2926                        WRITE32(open->op_why_no_deleg);
2927                        WRITE32(0);     /* deleg signaling not supported yet */
2928                        break;
2929                default:
2930                        RESERVE_SPACE(4);
2931                        WRITE32(open->op_why_no_deleg);
2932                }
2933                ADJUST_ARGS();
2934                break;
2935        default:
2936                BUG();
2937        }
2938        /* XXX save filehandle here */
2939out:
2940        return nfserr;
2941}
2942
2943static __be32
2944nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2945{
2946        if (!nfserr)
2947                nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2948
2949        return nfserr;
2950}
2951
2952static __be32
2953nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2954{
2955        if (!nfserr)
2956                nfsd4_encode_stateid(resp, &od->od_stateid);
2957
2958        return nfserr;
2959}
2960
2961static __be32
2962nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2963                  struct nfsd4_read *read)
2964{
2965        u32 eof;
2966        int v;
2967        struct page *page;
2968        unsigned long maxcount; 
2969        long len;
2970        __be32 *p;
2971
2972        if (nfserr)
2973                return nfserr;
2974        if (resp->xbuf->page_len)
2975                return nfserr_resource;
2976
2977        RESERVE_SPACE(8); /* eof flag and byte count */
2978
2979        maxcount = svc_max_payload(resp->rqstp);
2980        if (maxcount > read->rd_length)
2981                maxcount = read->rd_length;
2982
2983        len = maxcount;
2984        v = 0;
2985        while (len > 0) {
2986                page = *(resp->rqstp->rq_next_page);
2987                if (!page) { /* ran out of pages */
2988                        maxcount -= len;
2989                        break;
2990                }
2991                resp->rqstp->rq_vec[v].iov_base = page_address(page);
2992                resp->rqstp->rq_vec[v].iov_len =
2993                        len < PAGE_SIZE ? len : PAGE_SIZE;
2994                resp->rqstp->rq_next_page++;
2995                v++;
2996                len -= PAGE_SIZE;
2997        }
2998        read->rd_vlen = v;
2999
3000        nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3001                        read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
3002                        &maxcount);
3003
3004        if (nfserr)
3005                return nfserr;
3006        eof = (read->rd_offset + maxcount >=
3007               read->rd_fhp->fh_dentry->d_inode->i_size);
3008
3009        WRITE32(eof);
3010        WRITE32(maxcount);
3011        ADJUST_ARGS();
3012        resp->xbuf->head[0].iov_len = (char*)p
3013                                        - (char*)resp->xbuf->head[0].iov_base;
3014        resp->xbuf->page_len = maxcount;
3015
3016        /* Use rest of head for padding and remaining ops: */
3017        resp->xbuf->tail[0].iov_base = p;
3018        resp->xbuf->tail[0].iov_len = 0;
3019        if (maxcount&3) {
3020                RESERVE_SPACE(4);
3021                WRITE32(0);
3022                resp->xbuf->tail[0].iov_base += maxcount&3;
3023                resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3024                ADJUST_ARGS();
3025        }
3026        return 0;
3027}
3028
3029static __be32
3030nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3031{
3032        int maxcount;
3033        char *page;
3034        __be32 *p;
3035
3036        if (nfserr)
3037                return nfserr;
3038        if (resp->xbuf->page_len)
3039                return nfserr_resource;
3040        if (!*resp->rqstp->rq_next_page)
3041                return nfserr_resource;
3042
3043        page = page_address(*(resp->rqstp->rq_next_page++));
3044
3045        maxcount = PAGE_SIZE;
3046        RESERVE_SPACE(4);
3047
3048        /*
3049         * XXX: By default, the ->readlink() VFS op will truncate symlinks
3050         * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3051         * not, one easy fix is: if ->readlink() precisely fills the buffer,
3052         * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3053         */
3054        nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3055        if (nfserr == nfserr_isdir)
3056                return nfserr_inval;
3057        if (nfserr)
3058                return nfserr;
3059
3060        WRITE32(maxcount);
3061        ADJUST_ARGS();
3062        resp->xbuf->head[0].iov_len = (char*)p
3063                                - (char*)resp->xbuf->head[0].iov_base;
3064        resp->xbuf->page_len = maxcount;
3065
3066        /* Use rest of head for padding and remaining ops: */
3067        resp->xbuf->tail[0].iov_base = p;
3068        resp->xbuf->tail[0].iov_len = 0;
3069        if (maxcount&3) {
3070                RESERVE_SPACE(4);
3071                WRITE32(0);
3072                resp->xbuf->tail[0].iov_base += maxcount&3;
3073                resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3074                ADJUST_ARGS();
3075        }
3076        return 0;
3077}
3078
3079static __be32
3080nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3081{
3082        int maxcount;
3083        loff_t offset;
3084        __be32 *page, *savep, *tailbase;
3085        __be32 *p;
3086
3087        if (nfserr)
3088                return nfserr;
3089        if (resp->xbuf->page_len)
3090                return nfserr_resource;
3091        if (!*resp->rqstp->rq_next_page)
3092                return nfserr_resource;
3093
3094        RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3095        savep = p;
3096
3097        /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3098        WRITE32(0);
3099        WRITE32(0);
3100        ADJUST_ARGS();
3101        resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3102        tailbase = p;
3103
3104        maxcount = PAGE_SIZE;
3105        if (maxcount > readdir->rd_maxcount)
3106                maxcount = readdir->rd_maxcount;
3107
3108        /*
3109         * Convert from bytes to words, account for the two words already
3110         * written, make sure to leave two words at the end for the next
3111         * pointer and eof field.
3112         */
3113        maxcount = (maxcount >> 2) - 4;
3114        if (maxcount < 0) {
3115                nfserr =  nfserr_toosmall;
3116                goto err_no_verf;
3117        }
3118
3119        page = page_address(*(resp->rqstp->rq_next_page++));
3120        readdir->common.err = 0;
3121        readdir->buflen = maxcount;
3122        readdir->buffer = page;
3123        readdir->offset = NULL;
3124
3125        offset = readdir->rd_cookie;
3126        nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3127                              &offset,
3128                              &readdir->common, nfsd4_encode_dirent);
3129        if (nfserr == nfs_ok &&
3130            readdir->common.err == nfserr_toosmall &&
3131            readdir->buffer == page) 
3132                nfserr = nfserr_toosmall;
3133        if (nfserr)
3134                goto err_no_verf;
3135
3136        if (readdir->offset)
3137                xdr_encode_hyper(readdir->offset, offset);
3138
3139        p = readdir->buffer;
3140        *p++ = 0;       /* no more entries */
3141        *p++ = htonl(readdir->common.err == nfserr_eof);
3142        resp->xbuf->page_len = ((char*)p) -
3143                (char*)page_address(*(resp->rqstp->rq_next_page-1));
3144
3145        /* Use rest of head for padding and remaining ops: */
3146        resp->xbuf->tail[0].iov_base = tailbase;
3147        resp->xbuf->tail[0].iov_len = 0;
3148        resp->p = resp->xbuf->tail[0].iov_base;
3149        resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3150
3151        return 0;
3152err_no_verf:
3153        p = savep;
3154        ADJUST_ARGS();
3155        return nfserr;
3156}
3157
3158static __be32
3159nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3160{
3161        __be32 *p;
3162
3163        if (!nfserr) {
3164                RESERVE_SPACE(20);
3165                write_cinfo(&p, &remove->rm_cinfo);
3166                ADJUST_ARGS();
3167        }
3168        return nfserr;
3169}
3170
3171static __be32
3172nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3173{
3174        __be32 *p;
3175
3176        if (!nfserr) {
3177                RESERVE_SPACE(40);
3178                write_cinfo(&p, &rename->rn_sinfo);
3179                write_cinfo(&p, &rename->rn_tinfo);
3180                ADJUST_ARGS();
3181        }
3182        return nfserr;
3183}
3184
3185static __be32
3186nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3187                         __be32 nfserr, struct svc_export *exp)
3188{
3189        u32 i, nflavs, supported;
3190        struct exp_flavor_info *flavs;
3191        struct exp_flavor_info def_flavs[2];
3192        __be32 *p, *flavorsp;
3193        static bool report = true;
3194
3195        if (nfserr)
3196                goto out;
3197        if (exp->ex_nflavors) {
3198                flavs = exp->ex_flavors;
3199                nflavs = exp->ex_nflavors;
3200        } else { /* Handling of some defaults in absence of real secinfo: */
3201                flavs = def_flavs;
3202                if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3203                        nflavs = 2;
3204                        flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3205                        flavs[1].pseudoflavor = RPC_AUTH_NULL;
3206                } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3207                        nflavs = 1;
3208                        flavs[0].pseudoflavor
3209                                        = svcauth_gss_flavor(exp->ex_client);
3210                } else {
3211                        nflavs = 1;
3212                        flavs[0].pseudoflavor
3213                                        = exp->ex_client->flavour->flavour;
3214                }
3215        }
3216
3217        supported = 0;
3218        RESERVE_SPACE(4);
3219        flavorsp = p++;         /* to be backfilled later */
3220        ADJUST_ARGS();
3221
3222        for (i = 0; i < nflavs; i++) {
3223                rpc_authflavor_t pf = flavs[i].pseudoflavor;
3224                struct rpcsec_gss_info info;
3225
3226                if (rpcauth_get_gssinfo(pf, &info) == 0) {
3227                        supported++;
3228                        RESERVE_SPACE(4 + 4 + info.oid.len + 4 + 4);
3229                        WRITE32(RPC_AUTH_GSS);
3230                        WRITE32(info.oid.len);
3231                        WRITEMEM(info.oid.data, info.oid.len);
3232                        WRITE32(info.qop);
3233                        WRITE32(info.service);
3234                        ADJUST_ARGS();
3235                } else if (pf < RPC_AUTH_MAXFLAVOR) {
3236                        supported++;
3237                        RESERVE_SPACE(4);
3238                        WRITE32(pf);
3239                        ADJUST_ARGS();
3240                } else {
3241                        if (report)
3242                                pr_warn("NFS: SECINFO: security flavor %u "
3243                                        "is not supported\n", pf);
3244                }
3245        }
3246
3247        if (nflavs != supported)
3248                report = false;
3249        *flavorsp = htonl(supported);
3250
3251out:
3252        if (exp)
3253                exp_put(exp);
3254        return nfserr;
3255}
3256
3257static __be32
3258nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3259                     struct nfsd4_secinfo *secinfo)
3260{
3261        return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3262}
3263
3264static __be32
3265nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3266                     struct nfsd4_secinfo_no_name *secinfo)
3267{
3268        return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3269}
3270
3271/*
3272 * The SETATTR encode routine is special -- it always encodes a bitmap,
3273 * regardless of the error status.
3274 */
3275static __be32
3276nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3277{
3278        __be32 *p;
3279
3280        RESERVE_SPACE(16);
3281        if (nfserr) {
3282                WRITE32(3);
3283                WRITE32(0);
3284                WRITE32(0);
3285                WRITE32(0);
3286        }
3287        else {
3288                WRITE32(3);
3289                WRITE32(setattr->sa_bmval[0]);
3290                WRITE32(setattr->sa_bmval[1]);
3291                WRITE32(setattr->sa_bmval[2]);
3292        }
3293        ADJUST_ARGS();
3294        return nfserr;
3295}
3296
3297static __be32
3298nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3299{
3300        __be32 *p;
3301
3302        if (!nfserr) {
3303                RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3304                WRITEMEM(&scd->se_clientid, 8);
3305                WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3306                ADJUST_ARGS();
3307        }
3308        else if (nfserr == nfserr_clid_inuse) {
3309                RESERVE_SPACE(8);
3310                WRITE32(0);
3311                WRITE32(0);
3312                ADJUST_ARGS();
3313        }
3314        return nfserr;
3315}
3316
3317static __be32
3318nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3319{
3320        __be32 *p;
3321
3322        if (!nfserr) {
3323                RESERVE_SPACE(16);
3324                WRITE32(write->wr_bytes_written);
3325                WRITE32(write->wr_how_written);
3326                WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3327                ADJUST_ARGS();
3328        }
3329        return nfserr;
3330}
3331
3332static const u32 nfs4_minimal_spo_must_enforce[2] = {
3333        [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3334              1 << (OP_EXCHANGE_ID - 32) |
3335              1 << (OP_CREATE_SESSION - 32) |
3336              1 << (OP_DESTROY_SESSION - 32) |
3337              1 << (OP_DESTROY_CLIENTID - 32)
3338};
3339
3340static __be32
3341nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3342                         struct nfsd4_exchange_id *exid)
3343{
3344        __be32 *p;
3345        char *major_id;
3346        char *server_scope;
3347        int major_id_sz;
3348        int server_scope_sz;
3349        uint64_t minor_id = 0;
3350
3351        if (nfserr)
3352                return nfserr;
3353
3354        major_id = utsname()->nodename;
3355        major_id_sz = strlen(major_id);
3356        server_scope = utsname()->nodename;
3357        server_scope_sz = strlen(server_scope);
3358
3359        RESERVE_SPACE(
3360                8 /* eir_clientid */ +
3361                4 /* eir_sequenceid */ +
3362                4 /* eir_flags */ +
3363                4 /* spr_how */ +
3364                8 /* spo_must_enforce, spo_must_allow */ +
3365                8 /* so_minor_id */ +
3366                4 /* so_major_id.len */ +
3367                (XDR_QUADLEN(major_id_sz) * 4) +
3368                4 /* eir_server_scope.len */ +
3369                (XDR_QUADLEN(server_scope_sz) * 4) +
3370                4 /* eir_server_impl_id.count (0) */);
3371
3372        WRITEMEM(&exid->clientid, 8);
3373        WRITE32(exid->seqid);
3374        WRITE32(exid->flags);
3375
3376        WRITE32(exid->spa_how);
3377        switch (exid->spa_how) {
3378        case SP4_NONE:
3379                break;
3380        case SP4_MACH_CRED:
3381                /* spo_must_enforce bitmap: */
3382                WRITE32(2);
3383                WRITE32(nfs4_minimal_spo_must_enforce[0]);
3384                WRITE32(nfs4_minimal_spo_must_enforce[1]);
3385                /* empty spo_must_allow bitmap: */
3386                WRITE32(0);
3387                break;
3388        default:
3389                WARN_ON_ONCE(1);
3390        }
3391
3392        /* The server_owner struct */
3393        WRITE64(minor_id);      /* Minor id */
3394        /* major id */
3395        WRITE32(major_id_sz);
3396        WRITEMEM(major_id, major_id_sz);
3397
3398        /* Server scope */
3399        WRITE32(server_scope_sz);
3400        WRITEMEM(server_scope, server_scope_sz);
3401
3402        /* Implementation id */
3403        WRITE32(0);     /* zero length nfs_impl_id4 array */
3404        ADJUST_ARGS();
3405        return 0;
3406}
3407
3408static __be32
3409nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3410                            struct nfsd4_create_session *sess)
3411{
3412        __be32 *p;
3413
3414        if (nfserr)
3415                return nfserr;
3416
3417        RESERVE_SPACE(24);
3418        WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3419        WRITE32(sess->seqid);
3420        WRITE32(sess->flags);
3421        ADJUST_ARGS();
3422
3423        RESERVE_SPACE(28);
3424        WRITE32(0); /* headerpadsz */
3425        WRITE32(sess->fore_channel.maxreq_sz);
3426        WRITE32(sess->fore_channel.maxresp_sz);
3427        WRITE32(sess->fore_channel.maxresp_cached);
3428        WRITE32(sess->fore_channel.maxops);
3429        WRITE32(sess->fore_channel.maxreqs);
3430        WRITE32(sess->fore_channel.nr_rdma_attrs);
3431        ADJUST_ARGS();
3432
3433        if (sess->fore_channel.nr_rdma_attrs) {
3434                RESERVE_SPACE(4);
3435                WRITE32(sess->fore_channel.rdma_attrs);
3436                ADJUST_ARGS();
3437        }
3438
3439        RESERVE_SPACE(28);
3440        WRITE32(0); /* headerpadsz */
3441        WRITE32(sess->back_channel.maxreq_sz);
3442        WRITE32(sess->back_channel.maxresp_sz);
3443        WRITE32(sess->back_channel.maxresp_cached);
3444        WRITE32(sess->back_channel.maxops);
3445        WRITE32(sess->back_channel.maxreqs);
3446        WRITE32(sess->back_channel.nr_rdma_attrs);
3447        ADJUST_ARGS();
3448
3449        if (sess->back_channel.nr_rdma_attrs) {
3450                RESERVE_SPACE(4);
3451                WRITE32(sess->back_channel.rdma_attrs);
3452                ADJUST_ARGS();
3453        }
3454        return 0;
3455}
3456
3457static __be32
3458nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3459                             struct nfsd4_destroy_session *destroy_session)
3460{
3461        return nfserr;
3462}
3463
3464static __be32
3465nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3466                          struct nfsd4_free_stateid *free_stateid)
3467{
3468        __be32 *p;
3469
3470        if (nfserr)
3471                return nfserr;
3472
3473        RESERVE_SPACE(4);
3474        *p++ = nfserr;
3475        ADJUST_ARGS();
3476        return nfserr;
3477}
3478
3479static __be32
3480nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3481                      struct nfsd4_sequence *seq)
3482{
3483        __be32 *p;
3484
3485        if (nfserr)
3486                return nfserr;
3487
3488        RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3489        WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3490        WRITE32(seq->seqid);
3491        WRITE32(seq->slotid);
3492        /* Note slotid's are numbered from zero: */
3493        WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3494        WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3495        WRITE32(seq->status_flags);
3496
3497        ADJUST_ARGS();
3498        resp->cstate.datap = p; /* DRC cache data pointer */
3499        return 0;
3500}
3501
3502static __be32
3503nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3504                          struct nfsd4_test_stateid *test_stateid)
3505{
3506        struct nfsd4_test_stateid_id *stateid, *next;
3507        __be32 *p;
3508
3509        RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3510        *p++ = htonl(test_stateid->ts_num_ids);
3511
3512        list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3513                *p++ = stateid->ts_id_status;
3514        }
3515
3516        ADJUST_ARGS();
3517        return nfserr;
3518}
3519
3520static __be32
3521nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3522{
3523        return nfserr;
3524}
3525
3526typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3527
3528/*
3529 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3530 * since we don't need to filter out obsolete ops as this is
3531 * done in the decoding phase.
3532 */
3533static nfsd4_enc nfsd4_enc_ops[] = {
3534        [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3535        [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3536        [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3537        [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3538        [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3539        [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3540        [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3541        [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3542        [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3543        [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3544        [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3545        [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3546        [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3547        [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3548        [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3549        [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3550        [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3551        [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3552        [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3553        [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3554        [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3555        [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3556        [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3557        [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3558        [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3559        [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3560        [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3561        [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3562        [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3563        [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3564        [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3565        [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3566        [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3567        [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3568        [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3569        [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3570        [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3571
3572        /* NFSv4.1 operations */
3573        [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3574        [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3575        [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3576        [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3577        [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3578        [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3579        [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3580        [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3581        [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3582        [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3583        [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3584        [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3585        [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3586        [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3587        [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3588        [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3589        [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3590        [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3591        [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3592};
3593
3594/*
3595 * Calculate the total amount of memory that the compound response has taken
3596 * after encoding the current operation with pad.
3597 *
3598 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3599 *      which was specified at nfsd4_operation, else pad is zero.
3600 *
3601 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3602 *
3603 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3604 * will be at least a page and will therefore hold the xdr_buf head.
3605 */
3606__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3607{
3608        struct xdr_buf *xb = &resp->rqstp->rq_res;
3609        struct nfsd4_session *session = NULL;
3610        struct nfsd4_slot *slot = resp->cstate.slot;
3611        u32 length, tlen = 0;
3612
3613        if (!nfsd4_has_session(&resp->cstate))
3614                return 0;
3615
3616        session = resp->cstate.session;
3617        if (session == NULL)
3618                return 0;
3619
3620        if (xb->page_len == 0) {
3621                length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3622        } else {
3623                if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3624                        tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3625
3626                length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3627        }
3628        dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3629                length, xb->page_len, tlen, pad);
3630
3631        if (length > session->se_fchannel.maxresp_sz)
3632                return nfserr_rep_too_big;
3633
3634        if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3635            length > session->se_fchannel.maxresp_cached)
3636                return nfserr_rep_too_big_to_cache;
3637
3638        return 0;
3639}
3640
3641void
3642nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3643{
3644        struct nfs4_stateowner *so = resp->cstate.replay_owner;
3645        __be32 *statp;
3646        __be32 *p;
3647
3648        RESERVE_SPACE(8);
3649        WRITE32(op->opnum);
3650        statp = p++;    /* to be backfilled at the end */
3651        ADJUST_ARGS();
3652
3653        if (op->opnum == OP_ILLEGAL)
3654                goto status;
3655        BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3656               !nfsd4_enc_ops[op->opnum]);
3657        op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3658        /* nfsd4_check_drc_limit guarantees enough room for error status */
3659        if (!op->status)
3660                op->status = nfsd4_check_resp_size(resp, 0);
3661        if (so) {
3662                so->so_replay.rp_status = op->status;
3663                so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3664                memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3665        }
3666status:
3667        /*
3668         * Note: We write the status directly, instead of using WRITE32(),
3669         * since it is already in network byte order.
3670         */
3671        *statp = op->status;
3672}
3673
3674/* 
3675 * Encode the reply stored in the stateowner reply cache 
3676 * 
3677 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3678 * previously sent already encoded operation.
3679 *
3680 * called with nfs4_lock_state() held
3681 */
3682void
3683nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3684{
3685        __be32 *p;
3686        struct nfs4_replay *rp = op->replay;
3687
3688        BUG_ON(!rp);
3689
3690        RESERVE_SPACE(8);
3691        WRITE32(op->opnum);
3692        *p++ = rp->rp_status;  /* already xdr'ed */
3693        ADJUST_ARGS();
3694
3695        RESERVE_SPACE(rp->rp_buflen);
3696        WRITEMEM(rp->rp_buf, rp->rp_buflen);
3697        ADJUST_ARGS();
3698}
3699
3700int
3701nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3702{
3703        return xdr_ressize_check(rqstp, p);
3704}
3705
3706int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3707{
3708        struct svc_rqst *rqstp = rq;
3709        struct nfsd4_compoundargs *args = rqstp->rq_argp;
3710
3711        if (args->ops != args->iops) {
3712                kfree(args->ops);
3713                args->ops = args->iops;
3714        }
3715        kfree(args->tmpp);
3716        args->tmpp = NULL;
3717        while (args->to_free) {
3718                struct tmpbuf *tb = args->to_free;
3719                args->to_free = tb->next;
3720                tb->release(tb->buf);
3721                kfree(tb);
3722        }
3723        return 1;
3724}
3725
3726int
3727nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3728{
3729        args->p = p;
3730        args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3731        args->pagelist = rqstp->rq_arg.pages;
3732        args->pagelen = rqstp->rq_arg.page_len;
3733        args->tmpp = NULL;
3734        args->to_free = NULL;
3735        args->ops = args->iops;
3736        args->rqstp = rqstp;
3737
3738        return !nfsd4_decode_compound(args);
3739}
3740
3741int
3742nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3743{
3744        /*
3745         * All that remains is to write the tag and operation count...
3746         */
3747        struct nfsd4_compound_state *cs = &resp->cstate;
3748        struct kvec *iov;
3749        p = resp->tagp;
3750        *p++ = htonl(resp->taglen);
3751        memcpy(p, resp->tag, resp->taglen);
3752        p += XDR_QUADLEN(resp->taglen);
3753        *p++ = htonl(resp->opcnt);
3754
3755        if (rqstp->rq_res.page_len) 
3756                iov = &rqstp->rq_res.tail[0];
3757        else
3758                iov = &rqstp->rq_res.head[0];
3759        iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3760        BUG_ON(iov->iov_len > PAGE_SIZE);
3761        if (nfsd4_has_session(cs)) {
3762                struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3763                struct nfs4_client *clp = cs->session->se_client;
3764                if (cs->status != nfserr_replay_cache) {
3765                        nfsd4_store_cache_entry(resp);
3766                        cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3767                }
3768                /* Renew the clientid on success and on replay */
3769                spin_lock(&nn->client_lock);
3770                nfsd4_put_session(cs->session);
3771                spin_unlock(&nn->client_lock);
3772                put_client_renew(clp);
3773        }
3774        return 1;
3775}
3776
3777/*
3778 * Local variables:
3779 *  c-basic-offset: 8
3780 * End:
3781 */
3782
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