linux/fs/nfsd/nfs4proc.c
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   1/*
   2 *  Server-side procedures 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#include <linux/file.h>
  36#include <linux/slab.h>
  37
  38#include "idmap.h"
  39#include "cache.h"
  40#include "xdr4.h"
  41#include "vfs.h"
  42#include "current_stateid.h"
  43#include "netns.h"
  44
  45#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  46#include <linux/security.h>
  47
  48static inline void
  49nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  50{
  51        struct inode *inode = resfh->fh_dentry->d_inode;
  52        int status;
  53
  54        mutex_lock(&inode->i_mutex);
  55        status = security_inode_setsecctx(resfh->fh_dentry,
  56                label->data, label->len);
  57        mutex_unlock(&inode->i_mutex);
  58
  59        if (status)
  60                /*
  61                 * XXX: We should really fail the whole open, but we may
  62                 * already have created a new file, so it may be too
  63                 * late.  For now this seems the least of evils:
  64                 */
  65                bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  66
  67        return;
  68}
  69#else
  70static inline void
  71nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  72{ }
  73#endif
  74
  75#define NFSDDBG_FACILITY                NFSDDBG_PROC
  76
  77static u32 nfsd_attrmask[] = {
  78        NFSD_WRITEABLE_ATTRS_WORD0,
  79        NFSD_WRITEABLE_ATTRS_WORD1,
  80        NFSD_WRITEABLE_ATTRS_WORD2
  81};
  82
  83static u32 nfsd41_ex_attrmask[] = {
  84        NFSD_SUPPATTR_EXCLCREAT_WORD0,
  85        NFSD_SUPPATTR_EXCLCREAT_WORD1,
  86        NFSD_SUPPATTR_EXCLCREAT_WORD2
  87};
  88
  89static __be32
  90check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  91                   u32 *bmval, u32 *writable)
  92{
  93        struct dentry *dentry = cstate->current_fh.fh_dentry;
  94
  95        /*
  96         * Check about attributes are supported by the NFSv4 server or not.
  97         * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  98         */
  99        if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 100            (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 101            (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 102                return nfserr_attrnotsupp;
 103
 104        /*
 105         * Check FATTR4_WORD0_ACL can be supported
 106         * in current environment or not.
 107         */
 108        if (bmval[0] & FATTR4_WORD0_ACL) {
 109                if (!IS_POSIXACL(dentry->d_inode))
 110                        return nfserr_attrnotsupp;
 111        }
 112
 113        /*
 114         * According to spec, read-only attributes return ERR_INVAL.
 115         */
 116        if (writable) {
 117                if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 118                    (bmval[2] & ~writable[2]))
 119                        return nfserr_inval;
 120        }
 121
 122        return nfs_ok;
 123}
 124
 125static __be32
 126nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 127        struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 128{
 129        __be32 status = nfs_ok;
 130
 131        if (open->op_create == NFS4_OPEN_CREATE) {
 132                if (open->op_createmode == NFS4_CREATE_UNCHECKED
 133                    || open->op_createmode == NFS4_CREATE_GUARDED)
 134                        status = check_attr_support(rqstp, cstate,
 135                                        open->op_bmval, nfsd_attrmask);
 136                else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 137                        status = check_attr_support(rqstp, cstate,
 138                                        open->op_bmval, nfsd41_ex_attrmask);
 139        }
 140
 141        return status;
 142}
 143
 144static int
 145is_create_with_attrs(struct nfsd4_open *open)
 146{
 147        return open->op_create == NFS4_OPEN_CREATE
 148                && (open->op_createmode == NFS4_CREATE_UNCHECKED
 149                    || open->op_createmode == NFS4_CREATE_GUARDED
 150                    || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 151}
 152
 153/*
 154 * if error occurs when setting the acl, just clear the acl bit
 155 * in the returned attr bitmap.
 156 */
 157static void
 158do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 159                struct nfs4_acl *acl, u32 *bmval)
 160{
 161        __be32 status;
 162
 163        status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 164        if (status)
 165                /*
 166                 * We should probably fail the whole open at this point,
 167                 * but we've already created the file, so it's too late;
 168                 * So this seems the least of evils:
 169                 */
 170                bmval[0] &= ~FATTR4_WORD0_ACL;
 171}
 172
 173static inline void
 174fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 175{
 176        fh_put(dst);
 177        dget(src->fh_dentry);
 178        if (src->fh_export)
 179                cache_get(&src->fh_export->h);
 180        *dst = *src;
 181}
 182
 183static __be32
 184do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 185{
 186        __be32 status;
 187
 188        if (open->op_truncate &&
 189                !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 190                return nfserr_inval;
 191
 192        accmode |= NFSD_MAY_READ_IF_EXEC;
 193
 194        if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 195                accmode |= NFSD_MAY_READ;
 196        if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 197                accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 198        if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 199                accmode |= NFSD_MAY_WRITE;
 200
 201        status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 202
 203        return status;
 204}
 205
 206static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 207{
 208        umode_t mode = fh->fh_dentry->d_inode->i_mode;
 209
 210        if (S_ISREG(mode))
 211                return nfs_ok;
 212        if (S_ISDIR(mode))
 213                return nfserr_isdir;
 214        /*
 215         * Using err_symlink as our catch-all case may look odd; but
 216         * there's no other obvious error for this case in 4.0, and we
 217         * happen to know that it will cause the linux v4 client to do
 218         * the right thing on attempts to open something other than a
 219         * regular file.
 220         */
 221        return nfserr_symlink;
 222}
 223
 224static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 225{
 226        if (nfsd4_has_session(cstate))
 227                return;
 228        fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 229                        &resfh->fh_handle);
 230}
 231
 232static __be32
 233do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 234{
 235        struct svc_fh *current_fh = &cstate->current_fh;
 236        struct svc_fh *resfh;
 237        int accmode;
 238        __be32 status;
 239
 240        resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 241        if (!resfh)
 242                return nfserr_jukebox;
 243        fh_init(resfh, NFS4_FHSIZE);
 244        open->op_truncate = 0;
 245
 246        if (open->op_create) {
 247                /* FIXME: check session persistence and pnfs flags.
 248                 * The nfsv4.1 spec requires the following semantics:
 249                 *
 250                 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 251                 * Reply Cache  | server |                 |
 252                 * -------------+--------+-----------------+--------------------
 253                 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 254                 *              |        |                 | (SHOULD)
 255                 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 256                 *              |        |                 | (SHOULD NOT)
 257                 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 258                 * yes          | no     | GUARDED4        | GUARDED4
 259                 * yes          | yes    | GUARDED4        | GUARDED4
 260                 */
 261
 262                /*
 263                 * Note: create modes (UNCHECKED,GUARDED...) are the same
 264                 * in NFSv4 as in v3 except EXCLUSIVE4_1.
 265                 */
 266                status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 267                                        open->op_fname.len, &open->op_iattr,
 268                                        resfh, open->op_createmode,
 269                                        (u32 *)open->op_verf.data,
 270                                        &open->op_truncate, &open->op_created);
 271
 272                if (!status && open->op_label.len)
 273                        nfsd4_security_inode_setsecctx(resfh, &open->op_label, open->op_bmval);
 274
 275                /*
 276                 * Following rfc 3530 14.2.16, use the returned bitmask
 277                 * to indicate which attributes we used to store the
 278                 * verifier:
 279                 */
 280                if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 281                        open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 282                                                        FATTR4_WORD1_TIME_MODIFY);
 283        } else {
 284                status = nfsd_lookup(rqstp, current_fh,
 285                                     open->op_fname.data, open->op_fname.len, resfh);
 286                fh_unlock(current_fh);
 287        }
 288        if (status)
 289                goto out;
 290        status = nfsd_check_obj_isreg(resfh);
 291        if (status)
 292                goto out;
 293
 294        if (is_create_with_attrs(open) && open->op_acl != NULL)
 295                do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
 296
 297        nfsd4_set_open_owner_reply_cache(cstate, open, resfh);
 298        accmode = NFSD_MAY_NOP;
 299        if (open->op_created ||
 300                        open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 301                accmode |= NFSD_MAY_OWNER_OVERRIDE;
 302        status = do_open_permission(rqstp, resfh, open, accmode);
 303        set_change_info(&open->op_cinfo, current_fh);
 304        fh_dup2(current_fh, resfh);
 305out:
 306        fh_put(resfh);
 307        kfree(resfh);
 308        return status;
 309}
 310
 311static __be32
 312do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 313{
 314        struct svc_fh *current_fh = &cstate->current_fh;
 315        __be32 status;
 316        int accmode = 0;
 317
 318        /* We don't know the target directory, and therefore can not
 319        * set the change info
 320        */
 321
 322        memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 323
 324        nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 325
 326        open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 327                (open->op_iattr.ia_size == 0);
 328        /*
 329         * In the delegation case, the client is telling us about an
 330         * open that it *already* performed locally, some time ago.  We
 331         * should let it succeed now if possible.
 332         *
 333         * In the case of a CLAIM_FH open, on the other hand, the client
 334         * may be counting on us to enforce permissions (the Linux 4.1
 335         * client uses this for normal opens, for example).
 336         */
 337        if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 338                accmode = NFSD_MAY_OWNER_OVERRIDE;
 339
 340        status = do_open_permission(rqstp, current_fh, open, accmode);
 341
 342        return status;
 343}
 344
 345static void
 346copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 347{
 348        struct nfsd4_sessionid *sid =
 349                        (struct nfsd4_sessionid *)session->se_sessionid.data;
 350
 351        clid->cl_boot = sid->clientid.cl_boot;
 352        clid->cl_id = sid->clientid.cl_id;
 353}
 354
 355static __be32
 356nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 357           struct nfsd4_open *open)
 358{
 359        __be32 status;
 360        struct nfsd4_compoundres *resp;
 361        struct net *net = SVC_NET(rqstp);
 362        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 363
 364        dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 365                (int)open->op_fname.len, open->op_fname.data,
 366                open->op_openowner);
 367
 368        /* This check required by spec. */
 369        if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 370                return nfserr_inval;
 371
 372        open->op_created = 0;
 373        /*
 374         * RFC5661 18.51.3
 375         * Before RECLAIM_COMPLETE done, server should deny new lock
 376         */
 377        if (nfsd4_has_session(cstate) &&
 378            !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 379                      &cstate->session->se_client->cl_flags) &&
 380            open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 381                return nfserr_grace;
 382
 383        if (nfsd4_has_session(cstate))
 384                copy_clientid(&open->op_clientid, cstate->session);
 385
 386        nfs4_lock_state();
 387
 388        /* check seqid for replay. set nfs4_owner */
 389        resp = rqstp->rq_resp;
 390        status = nfsd4_process_open1(&resp->cstate, open, nn);
 391        if (status == nfserr_replay_me) {
 392                struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 393                fh_put(&cstate->current_fh);
 394                fh_copy_shallow(&cstate->current_fh.fh_handle,
 395                                &rp->rp_openfh);
 396                status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 397                if (status)
 398                        dprintk("nfsd4_open: replay failed"
 399                                " restoring previous filehandle\n");
 400                else
 401                        status = nfserr_replay_me;
 402        }
 403        if (status)
 404                goto out;
 405        if (open->op_xdr_error) {
 406                status = open->op_xdr_error;
 407                goto out;
 408        }
 409
 410        status = nfsd4_check_open_attributes(rqstp, cstate, open);
 411        if (status)
 412                goto out;
 413
 414        /* Openowner is now set, so sequence id will get bumped.  Now we need
 415         * these checks before we do any creates: */
 416        status = nfserr_grace;
 417        if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 418                goto out;
 419        status = nfserr_no_grace;
 420        if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 421                goto out;
 422
 423        switch (open->op_claim_type) {
 424                case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 425                case NFS4_OPEN_CLAIM_NULL:
 426                        status = do_open_lookup(rqstp, cstate, open);
 427                        if (status)
 428                                goto out;
 429                        break;
 430                case NFS4_OPEN_CLAIM_PREVIOUS:
 431                        open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 432                        status = nfs4_check_open_reclaim(&open->op_clientid,
 433                                                         cstate->minorversion,
 434                                                         nn);
 435                        if (status)
 436                                goto out;
 437                case NFS4_OPEN_CLAIM_FH:
 438                case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 439                        status = do_open_fhandle(rqstp, cstate, open);
 440                        if (status)
 441                                goto out;
 442                        break;
 443                case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 444                case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 445                        open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 446                        dprintk("NFSD: unsupported OPEN claim type %d\n",
 447                                open->op_claim_type);
 448                        status = nfserr_notsupp;
 449                        goto out;
 450                default:
 451                        dprintk("NFSD: Invalid OPEN claim type %d\n",
 452                                open->op_claim_type);
 453                        status = nfserr_inval;
 454                        goto out;
 455        }
 456        /*
 457         * nfsd4_process_open2() does the actual opening of the file.  If
 458         * successful, it (1) truncates the file if open->op_truncate was
 459         * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 460         */
 461        status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 462        WARN_ON(status && open->op_created);
 463out:
 464        nfsd4_cleanup_open_state(open, status);
 465        if (open->op_openowner && !nfsd4_has_session(cstate))
 466                cstate->replay_owner = &open->op_openowner->oo_owner;
 467        nfsd4_bump_seqid(cstate, status);
 468        if (!cstate->replay_owner)
 469                nfs4_unlock_state();
 470        return status;
 471}
 472
 473/*
 474 * OPEN is the only seqid-mutating operation whose decoding can fail
 475 * with a seqid-mutating error (specifically, decoding of user names in
 476 * the attributes).  Therefore we have to do some processing to look up
 477 * the stateowner so that we can bump the seqid.
 478 */
 479static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 480{
 481        struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 482
 483        if (!seqid_mutating_err(ntohl(op->status)))
 484                return op->status;
 485        if (nfsd4_has_session(cstate))
 486                return op->status;
 487        open->op_xdr_error = op->status;
 488        return nfsd4_open(rqstp, cstate, open);
 489}
 490
 491/*
 492 * filehandle-manipulating ops.
 493 */
 494static __be32
 495nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 496            struct svc_fh **getfh)
 497{
 498        if (!cstate->current_fh.fh_dentry)
 499                return nfserr_nofilehandle;
 500
 501        *getfh = &cstate->current_fh;
 502        return nfs_ok;
 503}
 504
 505static __be32
 506nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 507            struct nfsd4_putfh *putfh)
 508{
 509        fh_put(&cstate->current_fh);
 510        cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 511        memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 512               putfh->pf_fhlen);
 513        return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 514}
 515
 516static __be32
 517nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 518                void *arg)
 519{
 520        __be32 status;
 521
 522        fh_put(&cstate->current_fh);
 523        status = exp_pseudoroot(rqstp, &cstate->current_fh);
 524        return status;
 525}
 526
 527static __be32
 528nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 529                void *arg)
 530{
 531        if (!cstate->save_fh.fh_dentry)
 532                return nfserr_restorefh;
 533
 534        fh_dup2(&cstate->current_fh, &cstate->save_fh);
 535        if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 536                memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 537                SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 538        }
 539        return nfs_ok;
 540}
 541
 542static __be32
 543nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 544             void *arg)
 545{
 546        if (!cstate->current_fh.fh_dentry)
 547                return nfserr_nofilehandle;
 548
 549        fh_dup2(&cstate->save_fh, &cstate->current_fh);
 550        if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 551                memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 552                SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 553        }
 554        return nfs_ok;
 555}
 556
 557/*
 558 * misc nfsv4 ops
 559 */
 560static __be32
 561nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 562             struct nfsd4_access *access)
 563{
 564        if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 565                return nfserr_inval;
 566
 567        access->ac_resp_access = access->ac_req_access;
 568        return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 569                           &access->ac_supported);
 570}
 571
 572static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 573{
 574        __be32 verf[2];
 575        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 576
 577        verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 578        verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 579        memcpy(verifier->data, verf, sizeof(verifier->data));
 580}
 581
 582static __be32
 583nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 584             struct nfsd4_commit *commit)
 585{
 586        gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 587        return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 588                             commit->co_count);
 589}
 590
 591static __be32
 592nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 593             struct nfsd4_create *create)
 594{
 595        struct svc_fh resfh;
 596        __be32 status;
 597        dev_t rdev;
 598
 599        fh_init(&resfh, NFS4_FHSIZE);
 600
 601        status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 602                           NFSD_MAY_CREATE);
 603        if (status)
 604                return status;
 605
 606        status = check_attr_support(rqstp, cstate, create->cr_bmval,
 607                                    nfsd_attrmask);
 608        if (status)
 609                return status;
 610
 611        switch (create->cr_type) {
 612        case NF4LNK:
 613                /* ugh! we have to null-terminate the linktext, or
 614                 * vfs_symlink() will choke.  it is always safe to
 615                 * null-terminate by brute force, since at worst we
 616                 * will overwrite the first byte of the create namelen
 617                 * in the XDR buffer, which has already been extracted
 618                 * during XDR decode.
 619                 */
 620                create->cr_linkname[create->cr_linklen] = 0;
 621
 622                status = nfsd_symlink(rqstp, &cstate->current_fh,
 623                                      create->cr_name, create->cr_namelen,
 624                                      create->cr_linkname, create->cr_linklen,
 625                                      &resfh, &create->cr_iattr);
 626                break;
 627
 628        case NF4BLK:
 629                rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 630                if (MAJOR(rdev) != create->cr_specdata1 ||
 631                    MINOR(rdev) != create->cr_specdata2)
 632                        return nfserr_inval;
 633                status = nfsd_create(rqstp, &cstate->current_fh,
 634                                     create->cr_name, create->cr_namelen,
 635                                     &create->cr_iattr, S_IFBLK, rdev, &resfh);
 636                break;
 637
 638        case NF4CHR:
 639                rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 640                if (MAJOR(rdev) != create->cr_specdata1 ||
 641                    MINOR(rdev) != create->cr_specdata2)
 642                        return nfserr_inval;
 643                status = nfsd_create(rqstp, &cstate->current_fh,
 644                                     create->cr_name, create->cr_namelen,
 645                                     &create->cr_iattr,S_IFCHR, rdev, &resfh);
 646                break;
 647
 648        case NF4SOCK:
 649                status = nfsd_create(rqstp, &cstate->current_fh,
 650                                     create->cr_name, create->cr_namelen,
 651                                     &create->cr_iattr, S_IFSOCK, 0, &resfh);
 652                break;
 653
 654        case NF4FIFO:
 655                status = nfsd_create(rqstp, &cstate->current_fh,
 656                                     create->cr_name, create->cr_namelen,
 657                                     &create->cr_iattr, S_IFIFO, 0, &resfh);
 658                break;
 659
 660        case NF4DIR:
 661                create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 662                status = nfsd_create(rqstp, &cstate->current_fh,
 663                                     create->cr_name, create->cr_namelen,
 664                                     &create->cr_iattr, S_IFDIR, 0, &resfh);
 665                break;
 666
 667        default:
 668                status = nfserr_badtype;
 669        }
 670
 671        if (status)
 672                goto out;
 673
 674        if (create->cr_label.len)
 675                nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 676
 677        if (create->cr_acl != NULL)
 678                do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 679                                create->cr_bmval);
 680
 681        fh_unlock(&cstate->current_fh);
 682        set_change_info(&create->cr_cinfo, &cstate->current_fh);
 683        fh_dup2(&cstate->current_fh, &resfh);
 684out:
 685        fh_put(&resfh);
 686        return status;
 687}
 688
 689static __be32
 690nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 691              struct nfsd4_getattr *getattr)
 692{
 693        __be32 status;
 694
 695        status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 696        if (status)
 697                return status;
 698
 699        if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 700                return nfserr_inval;
 701
 702        getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 703        getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 704        getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 705
 706        getattr->ga_fhp = &cstate->current_fh;
 707        return nfs_ok;
 708}
 709
 710static __be32
 711nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 712           struct nfsd4_link *link)
 713{
 714        __be32 status = nfserr_nofilehandle;
 715
 716        if (!cstate->save_fh.fh_dentry)
 717                return status;
 718        status = nfsd_link(rqstp, &cstate->current_fh,
 719                           link->li_name, link->li_namelen, &cstate->save_fh);
 720        if (!status)
 721                set_change_info(&link->li_cinfo, &cstate->current_fh);
 722        return status;
 723}
 724
 725static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 726{
 727        struct svc_fh tmp_fh;
 728        __be32 ret;
 729
 730        fh_init(&tmp_fh, NFS4_FHSIZE);
 731        ret = exp_pseudoroot(rqstp, &tmp_fh);
 732        if (ret)
 733                return ret;
 734        if (tmp_fh.fh_dentry == fh->fh_dentry) {
 735                fh_put(&tmp_fh);
 736                return nfserr_noent;
 737        }
 738        fh_put(&tmp_fh);
 739        return nfsd_lookup(rqstp, fh, "..", 2, fh);
 740}
 741
 742static __be32
 743nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 744              void *arg)
 745{
 746        return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 747}
 748
 749static __be32
 750nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 751             struct nfsd4_lookup *lookup)
 752{
 753        return nfsd_lookup(rqstp, &cstate->current_fh,
 754                           lookup->lo_name, lookup->lo_len,
 755                           &cstate->current_fh);
 756}
 757
 758static __be32
 759nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 760           struct nfsd4_read *read)
 761{
 762        __be32 status;
 763
 764        /* no need to check permission - this will be done in nfsd_read() */
 765
 766        read->rd_filp = NULL;
 767        if (read->rd_offset >= OFFSET_MAX)
 768                return nfserr_inval;
 769
 770        /*
 771         * If we do a zero copy read, then a client will see read data
 772         * that reflects the state of the file *after* performing the
 773         * following compound.
 774         *
 775         * To ensure proper ordering, we therefore turn off zero copy if
 776         * the client wants us to do more in this compound:
 777         */
 778        if (!nfsd4_last_compound_op(rqstp))
 779                rqstp->rq_splice_ok = false;
 780
 781        nfs4_lock_state();
 782        /* check stateid */
 783        if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 784                                                 cstate, &read->rd_stateid,
 785                                                 RD_STATE, &read->rd_filp))) {
 786                dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 787                goto out;
 788        }
 789        if (read->rd_filp)
 790                get_file(read->rd_filp);
 791        status = nfs_ok;
 792out:
 793        nfs4_unlock_state();
 794        read->rd_rqstp = rqstp;
 795        read->rd_fhp = &cstate->current_fh;
 796        return status;
 797}
 798
 799static __be32
 800nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 801              struct nfsd4_readdir *readdir)
 802{
 803        u64 cookie = readdir->rd_cookie;
 804        static const nfs4_verifier zeroverf;
 805
 806        /* no need to check permission - this will be done in nfsd_readdir() */
 807
 808        if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 809                return nfserr_inval;
 810
 811        readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 812        readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 813        readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 814
 815        if ((cookie == 1) || (cookie == 2) ||
 816            (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 817                return nfserr_bad_cookie;
 818
 819        readdir->rd_rqstp = rqstp;
 820        readdir->rd_fhp = &cstate->current_fh;
 821        return nfs_ok;
 822}
 823
 824static __be32
 825nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 826               struct nfsd4_readlink *readlink)
 827{
 828        readlink->rl_rqstp = rqstp;
 829        readlink->rl_fhp = &cstate->current_fh;
 830        return nfs_ok;
 831}
 832
 833static __be32
 834nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 835             struct nfsd4_remove *remove)
 836{
 837        __be32 status;
 838
 839        if (locks_in_grace(SVC_NET(rqstp)))
 840                return nfserr_grace;
 841        status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 842                             remove->rm_name, remove->rm_namelen);
 843        if (!status) {
 844                fh_unlock(&cstate->current_fh);
 845                set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 846        }
 847        return status;
 848}
 849
 850static __be32
 851nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 852             struct nfsd4_rename *rename)
 853{
 854        __be32 status = nfserr_nofilehandle;
 855
 856        if (!cstate->save_fh.fh_dentry)
 857                return status;
 858        if (locks_in_grace(SVC_NET(rqstp)) &&
 859                !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 860                return nfserr_grace;
 861        status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 862                             rename->rn_snamelen, &cstate->current_fh,
 863                             rename->rn_tname, rename->rn_tnamelen);
 864        if (status)
 865                return status;
 866        set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 867        set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 868        return nfs_ok;
 869}
 870
 871static __be32
 872nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 873              struct nfsd4_secinfo *secinfo)
 874{
 875        struct svc_fh resfh;
 876        struct svc_export *exp;
 877        struct dentry *dentry;
 878        __be32 err;
 879
 880        fh_init(&resfh, NFS4_FHSIZE);
 881        err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 882        if (err)
 883                return err;
 884        err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 885                                    secinfo->si_name, secinfo->si_namelen,
 886                                    &exp, &dentry);
 887        if (err)
 888                return err;
 889        if (dentry->d_inode == NULL) {
 890                exp_put(exp);
 891                err = nfserr_noent;
 892        } else
 893                secinfo->si_exp = exp;
 894        dput(dentry);
 895        if (cstate->minorversion)
 896                /* See rfc 5661 section 2.6.3.1.1.8 */
 897                fh_put(&cstate->current_fh);
 898        return err;
 899}
 900
 901static __be32
 902nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 903              struct nfsd4_secinfo_no_name *sin)
 904{
 905        __be32 err;
 906
 907        switch (sin->sin_style) {
 908        case NFS4_SECINFO_STYLE4_CURRENT_FH:
 909                break;
 910        case NFS4_SECINFO_STYLE4_PARENT:
 911                err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 912                if (err)
 913                        return err;
 914                break;
 915        default:
 916                return nfserr_inval;
 917        }
 918        exp_get(cstate->current_fh.fh_export);
 919        sin->sin_exp = cstate->current_fh.fh_export;
 920        fh_put(&cstate->current_fh);
 921        return nfs_ok;
 922}
 923
 924static __be32
 925nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 926              struct nfsd4_setattr *setattr)
 927{
 928        __be32 status = nfs_ok;
 929        int err;
 930
 931        if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 932                nfs4_lock_state();
 933                status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 934                        &setattr->sa_stateid, WR_STATE, NULL);
 935                nfs4_unlock_state();
 936                if (status) {
 937                        dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 938                        return status;
 939                }
 940        }
 941        err = fh_want_write(&cstate->current_fh);
 942        if (err)
 943                return nfserrno(err);
 944        status = nfs_ok;
 945
 946        status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 947                                    nfsd_attrmask);
 948        if (status)
 949                goto out;
 950
 951        if (setattr->sa_acl != NULL)
 952                status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 953                                            setattr->sa_acl);
 954        if (status)
 955                goto out;
 956        if (setattr->sa_label.len)
 957                status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 958                                &setattr->sa_label);
 959        if (status)
 960                goto out;
 961        status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 962                                0, (time_t)0);
 963out:
 964        fh_drop_write(&cstate->current_fh);
 965        return status;
 966}
 967
 968static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 969{
 970        int i = 1;
 971        int buflen = write->wr_buflen;
 972
 973        vec[0].iov_base = write->wr_head.iov_base;
 974        vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 975        buflen -= vec[0].iov_len;
 976
 977        while (buflen) {
 978                vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 979                vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 980                buflen -= vec[i].iov_len;
 981                i++;
 982        }
 983        return i;
 984}
 985
 986static __be32
 987nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 988            struct nfsd4_write *write)
 989{
 990        stateid_t *stateid = &write->wr_stateid;
 991        struct file *filp = NULL;
 992        __be32 status = nfs_ok;
 993        unsigned long cnt;
 994        int nvecs;
 995
 996        /* no need to check permission - this will be done in nfsd_write() */
 997
 998        if (write->wr_offset >= OFFSET_MAX)
 999                return nfserr_inval;
1000
1001        nfs4_lock_state();
1002        status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
1003                                        cstate, stateid, WR_STATE, &filp);
1004        if (status) {
1005                nfs4_unlock_state();
1006                dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1007                return status;
1008        }
1009        if (filp)
1010                get_file(filp);
1011        nfs4_unlock_state();
1012
1013        cnt = write->wr_buflen;
1014        write->wr_how_written = write->wr_stable_how;
1015        gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1016
1017        nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1018        WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1019
1020        status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1021                             write->wr_offset, rqstp->rq_vec, nvecs,
1022                             &cnt, &write->wr_how_written);
1023        if (filp)
1024                fput(filp);
1025
1026        write->wr_bytes_written = cnt;
1027
1028        return status;
1029}
1030
1031/* This routine never returns NFS_OK!  If there are no other errors, it
1032 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1033 * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1034 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1035 */
1036static __be32
1037_nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1038             struct nfsd4_verify *verify)
1039{
1040        __be32 *buf, *p;
1041        int count;
1042        __be32 status;
1043
1044        status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1045        if (status)
1046                return status;
1047
1048        status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1049        if (status)
1050                return status;
1051
1052        if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1053            || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1054                return nfserr_inval;
1055        if (verify->ve_attrlen & 3)
1056                return nfserr_inval;
1057
1058        /* count in words:
1059         *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1060         */
1061        count = 4 + (verify->ve_attrlen >> 2);
1062        buf = kmalloc(count << 2, GFP_KERNEL);
1063        if (!buf)
1064                return nfserr_jukebox;
1065
1066        p = buf;
1067        status = nfsd4_encode_fattr(&cstate->current_fh,
1068                                    cstate->current_fh.fh_export,
1069                                    cstate->current_fh.fh_dentry, &p,
1070                                    count, verify->ve_bmval,
1071                                    rqstp, 0);
1072
1073        /* this means that nfsd4_encode_fattr() ran out of space */
1074        if (status == nfserr_resource)
1075                status = nfserr_not_same;
1076        if (status)
1077                goto out_kfree;
1078
1079        /* skip bitmap */
1080        p = buf + 1 + ntohl(buf[0]);
1081        status = nfserr_not_same;
1082        if (ntohl(*p++) != verify->ve_attrlen)
1083                goto out_kfree;
1084        if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1085                status = nfserr_same;
1086
1087out_kfree:
1088        kfree(buf);
1089        return status;
1090}
1091
1092static __be32
1093nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1094              struct nfsd4_verify *verify)
1095{
1096        __be32 status;
1097
1098        status = _nfsd4_verify(rqstp, cstate, verify);
1099        return status == nfserr_not_same ? nfs_ok : status;
1100}
1101
1102static __be32
1103nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1104             struct nfsd4_verify *verify)
1105{
1106        __be32 status;
1107
1108        status = _nfsd4_verify(rqstp, cstate, verify);
1109        return status == nfserr_same ? nfs_ok : status;
1110}
1111
1112/*
1113 * NULL call.
1114 */
1115static __be32
1116nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1117{
1118        return nfs_ok;
1119}
1120
1121static inline void nfsd4_increment_op_stats(u32 opnum)
1122{
1123        if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1124                nfsdstats.nfs4_opcount[opnum]++;
1125}
1126
1127typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1128                              void *);
1129typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1130typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1131typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1132
1133enum nfsd4_op_flags {
1134        ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1135        ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1136        ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1137        /* For rfc 5661 section 2.6.3.1.1: */
1138        OP_HANDLES_WRONGSEC = 1 << 3,
1139        OP_IS_PUTFH_LIKE = 1 << 4,
1140        /*
1141         * These are the ops whose result size we estimate before
1142         * encoding, to avoid performing an op then not being able to
1143         * respond or cache a response.  This includes writes and setattrs
1144         * as well as the operations usually called "nonidempotent":
1145         */
1146        OP_MODIFIES_SOMETHING = 1 << 5,
1147        /*
1148         * Cache compounds containing these ops in the xid-based drc:
1149         * We use the DRC for compounds containing non-idempotent
1150         * operations, *except* those that are 4.1-specific (since
1151         * sessions provide their own EOS), and except for stateful
1152         * operations other than setclientid and setclientid_confirm
1153         * (since sequence numbers provide EOS for open, lock, etc in
1154         * the v4.0 case).
1155         */
1156        OP_CACHEME = 1 << 6,
1157        /*
1158         * These are ops which clear current state id.
1159         */
1160        OP_CLEAR_STATEID = 1 << 7,
1161};
1162
1163struct nfsd4_operation {
1164        nfsd4op_func op_func;
1165        u32 op_flags;
1166        char *op_name;
1167        /* Try to get response size before operation */
1168        nfsd4op_rsize op_rsize_bop;
1169        stateid_getter op_get_currentstateid;
1170        stateid_setter op_set_currentstateid;
1171};
1172
1173static struct nfsd4_operation nfsd4_ops[];
1174
1175#ifdef NFSD_DEBUG
1176static const char *nfsd4_op_name(unsigned opnum);
1177#endif
1178
1179/*
1180 * Enforce NFSv4.1 COMPOUND ordering rules:
1181 *
1182 * Also note, enforced elsewhere:
1183 *      - SEQUENCE other than as first op results in
1184 *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1185 *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1186 *        (Enforced in nfsd4_bind_conn_to_session().)
1187 *      - DESTROY_SESSION must be the final operation in a compound, if
1188 *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1189 *        (Enforced in nfsd4_destroy_session().)
1190 */
1191static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1192{
1193        struct nfsd4_op *op = &args->ops[0];
1194
1195        /* These ordering requirements don't apply to NFSv4.0: */
1196        if (args->minorversion == 0)
1197                return nfs_ok;
1198        /* This is weird, but OK, not our problem: */
1199        if (args->opcnt == 0)
1200                return nfs_ok;
1201        if (op->status == nfserr_op_illegal)
1202                return nfs_ok;
1203        if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1204                return nfserr_op_not_in_session;
1205        if (op->opnum == OP_SEQUENCE)
1206                return nfs_ok;
1207        if (args->opcnt != 1)
1208                return nfserr_not_only_op;
1209        return nfs_ok;
1210}
1211
1212static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1213{
1214        return &nfsd4_ops[op->opnum];
1215}
1216
1217bool nfsd4_cache_this_op(struct nfsd4_op *op)
1218{
1219        return OPDESC(op)->op_flags & OP_CACHEME;
1220}
1221
1222static bool need_wrongsec_check(struct svc_rqst *rqstp)
1223{
1224        struct nfsd4_compoundres *resp = rqstp->rq_resp;
1225        struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1226        struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1227        struct nfsd4_op *next = &argp->ops[resp->opcnt];
1228        struct nfsd4_operation *thisd;
1229        struct nfsd4_operation *nextd;
1230
1231        thisd = OPDESC(this);
1232        /*
1233         * Most ops check wronsec on our own; only the putfh-like ops
1234         * have special rules.
1235         */
1236        if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1237                return false;
1238        /*
1239         * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1240         * put-filehandle operation if we're not going to use the
1241         * result:
1242         */
1243        if (argp->opcnt == resp->opcnt)
1244                return false;
1245
1246        nextd = OPDESC(next);
1247        /*
1248         * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1249         * errors themselves as necessary; others should check for them
1250         * now:
1251         */
1252        return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1253}
1254
1255/*
1256 * COMPOUND call.
1257 */
1258static __be32
1259nfsd4_proc_compound(struct svc_rqst *rqstp,
1260                    struct nfsd4_compoundargs *args,
1261                    struct nfsd4_compoundres *resp)
1262{
1263        struct nfsd4_op *op;
1264        struct nfsd4_operation *opdesc;
1265        struct nfsd4_compound_state *cstate = &resp->cstate;
1266        int             slack_bytes;
1267        u32             plen = 0;
1268        __be32          status;
1269
1270        resp->xbuf = &rqstp->rq_res;
1271        resp->p = rqstp->rq_res.head[0].iov_base +
1272                                                rqstp->rq_res.head[0].iov_len;
1273        resp->tagp = resp->p;
1274        /* reserve space for: taglen, tag, and opcnt */
1275        resp->p += 2 + XDR_QUADLEN(args->taglen);
1276        resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1277        resp->taglen = args->taglen;
1278        resp->tag = args->tag;
1279        resp->opcnt = 0;
1280        resp->rqstp = rqstp;
1281        resp->cstate.minorversion = args->minorversion;
1282        resp->cstate.replay_owner = NULL;
1283        resp->cstate.session = NULL;
1284        fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1285        fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1286        /*
1287         * Don't use the deferral mechanism for NFSv4; compounds make it
1288         * too hard to avoid non-idempotency problems.
1289         */
1290        rqstp->rq_usedeferral = 0;
1291
1292        /*
1293         * According to RFC3010, this takes precedence over all other errors.
1294         */
1295        status = nfserr_minor_vers_mismatch;
1296        if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1297                goto out;
1298
1299        status = nfs41_check_op_ordering(args);
1300        if (status) {
1301                op = &args->ops[0];
1302                op->status = status;
1303                goto encode_op;
1304        }
1305
1306        while (!status && resp->opcnt < args->opcnt) {
1307                op = &args->ops[resp->opcnt++];
1308
1309                dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1310                        resp->opcnt, args->opcnt, op->opnum,
1311                        nfsd4_op_name(op->opnum));
1312                /*
1313                 * The XDR decode routines may have pre-set op->status;
1314                 * for example, if there is a miscellaneous XDR error
1315                 * it will be set to nfserr_bad_xdr.
1316                 */
1317                if (op->status) {
1318                        if (op->opnum == OP_OPEN)
1319                                op->status = nfsd4_open_omfg(rqstp, cstate, op);
1320                        goto encode_op;
1321                }
1322
1323                /* We must be able to encode a successful response to
1324                 * this operation, with enough room left over to encode a
1325                 * failed response to the next operation.  If we don't
1326                 * have enough room, fail with ERR_RESOURCE.
1327                 */
1328                slack_bytes = (char *)resp->end - (char *)resp->p;
1329                if (slack_bytes < COMPOUND_SLACK_SPACE
1330                                + COMPOUND_ERR_SLACK_SPACE) {
1331                        BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1332                        op->status = nfserr_resource;
1333                        goto encode_op;
1334                }
1335
1336                opdesc = OPDESC(op);
1337
1338                if (!cstate->current_fh.fh_dentry) {
1339                        if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1340                                op->status = nfserr_nofilehandle;
1341                                goto encode_op;
1342                        }
1343                } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1344                          !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1345                        op->status = nfserr_moved;
1346                        goto encode_op;
1347                }
1348
1349                /* If op is non-idempotent */
1350                if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1351                        plen = opdesc->op_rsize_bop(rqstp, op);
1352                        op->status = nfsd4_check_resp_size(resp, plen);
1353                }
1354
1355                if (op->status)
1356                        goto encode_op;
1357
1358                if (opdesc->op_get_currentstateid)
1359                        opdesc->op_get_currentstateid(cstate, &op->u);
1360                op->status = opdesc->op_func(rqstp, cstate, &op->u);
1361
1362                if (!op->status) {
1363                        if (opdesc->op_set_currentstateid)
1364                                opdesc->op_set_currentstateid(cstate, &op->u);
1365
1366                        if (opdesc->op_flags & OP_CLEAR_STATEID)
1367                                clear_current_stateid(cstate);
1368
1369                        if (need_wrongsec_check(rqstp))
1370                                op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1371                }
1372
1373encode_op:
1374                /* Only from SEQUENCE */
1375                if (resp->cstate.status == nfserr_replay_cache) {
1376                        dprintk("%s NFS4.1 replay from cache\n", __func__);
1377                        status = op->status;
1378                        goto out;
1379                }
1380                if (op->status == nfserr_replay_me) {
1381                        op->replay = &cstate->replay_owner->so_replay;
1382                        nfsd4_encode_replay(resp, op);
1383                        status = op->status = op->replay->rp_status;
1384                } else {
1385                        nfsd4_encode_operation(resp, op);
1386                        status = op->status;
1387                }
1388
1389                dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1390                        args->ops, args->opcnt, resp->opcnt, op->opnum,
1391                        be32_to_cpu(status));
1392
1393                if (cstate->replay_owner) {
1394                        nfs4_unlock_state();
1395                        cstate->replay_owner = NULL;
1396                }
1397                /* XXX Ugh, we need to get rid of this kind of special case: */
1398                if (op->opnum == OP_READ && op->u.read.rd_filp)
1399                        fput(op->u.read.rd_filp);
1400
1401                nfsd4_increment_op_stats(op->opnum);
1402        }
1403
1404        resp->cstate.status = status;
1405        fh_put(&resp->cstate.current_fh);
1406        fh_put(&resp->cstate.save_fh);
1407        BUG_ON(resp->cstate.replay_owner);
1408out:
1409        /* Reset deferral mechanism for RPC deferrals */
1410        rqstp->rq_usedeferral = 1;
1411        dprintk("nfsv4 compound returned %d\n", ntohl(status));
1412        return status;
1413}
1414
1415#define op_encode_hdr_size              (2)
1416#define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1417#define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1418#define op_encode_change_info_maxsz     (5)
1419#define nfs4_fattr_bitmap_maxsz         (4)
1420
1421#define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1422#define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1423
1424#define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1425
1426#define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1427#define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1428                                         op_encode_ace_maxsz)
1429
1430#define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1431
1432static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1433{
1434        return (op_encode_hdr_size) * sizeof(__be32);
1435}
1436
1437static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1438{
1439        return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1440}
1441
1442static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1443{
1444        return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1445}
1446
1447static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1448{
1449        return (op_encode_hdr_size + op_encode_change_info_maxsz
1450                + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1451}
1452
1453static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1454{
1455        return (op_encode_hdr_size + op_encode_change_info_maxsz)
1456                * sizeof(__be32);
1457}
1458
1459static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1460{
1461        return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1462                * sizeof(__be32);
1463}
1464
1465static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1466{
1467        return (op_encode_hdr_size + op_encode_stateid_maxsz
1468                + op_encode_change_info_maxsz + 1
1469                + nfs4_fattr_bitmap_maxsz
1470                + op_encode_delegation_maxsz) * sizeof(__be32);
1471}
1472
1473static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1474{
1475        u32 maxcount = 0, rlen = 0;
1476
1477        maxcount = svc_max_payload(rqstp);
1478        rlen = op->u.read.rd_length;
1479
1480        if (rlen > maxcount)
1481                rlen = maxcount;
1482
1483        return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1484}
1485
1486static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1487{
1488        u32 rlen = op->u.readdir.rd_maxcount;
1489
1490        if (rlen > PAGE_SIZE)
1491                rlen = PAGE_SIZE;
1492
1493        return (op_encode_hdr_size + op_encode_verifier_maxsz)
1494                 * sizeof(__be32) + rlen;
1495}
1496
1497static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1498{
1499        return (op_encode_hdr_size + op_encode_change_info_maxsz)
1500                * sizeof(__be32);
1501}
1502
1503static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1504{
1505        return (op_encode_hdr_size + op_encode_change_info_maxsz
1506                + op_encode_change_info_maxsz) * sizeof(__be32);
1507}
1508
1509static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1510{
1511        return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1512}
1513
1514static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1515{
1516        return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1517}
1518
1519static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1520{
1521        return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1522}
1523
1524static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1525{
1526        return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1527                1 + 1 + 2 + /* eir_flags, spr_how, spo_must_enforce & _allow */\
1528                2 + /*eir_server_owner.so_minor_id */\
1529                /* eir_server_owner.so_major_id<> */\
1530                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1531                /* eir_server_scope<> */\
1532                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1533                1 + /* eir_server_impl_id array length */\
1534                0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1535}
1536
1537static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1538{
1539        return (op_encode_hdr_size + \
1540                XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1541                2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1542}
1543
1544static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1545{
1546        return (op_encode_hdr_size + \
1547                XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1548                2 + /* csr_sequence, csr_flags */\
1549                op_encode_channel_attrs_maxsz + \
1550                op_encode_channel_attrs_maxsz) * sizeof(__be32);
1551}
1552
1553static struct nfsd4_operation nfsd4_ops[] = {
1554        [OP_ACCESS] = {
1555                .op_func = (nfsd4op_func)nfsd4_access,
1556                .op_name = "OP_ACCESS",
1557        },
1558        [OP_CLOSE] = {
1559                .op_func = (nfsd4op_func)nfsd4_close,
1560                .op_flags = OP_MODIFIES_SOMETHING,
1561                .op_name = "OP_CLOSE",
1562                .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1563                .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1564                .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1565        },
1566        [OP_COMMIT] = {
1567                .op_func = (nfsd4op_func)nfsd4_commit,
1568                .op_flags = OP_MODIFIES_SOMETHING,
1569                .op_name = "OP_COMMIT",
1570                .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1571        },
1572        [OP_CREATE] = {
1573                .op_func = (nfsd4op_func)nfsd4_create,
1574                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1575                .op_name = "OP_CREATE",
1576                .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1577        },
1578        [OP_DELEGRETURN] = {
1579                .op_func = (nfsd4op_func)nfsd4_delegreturn,
1580                .op_flags = OP_MODIFIES_SOMETHING,
1581                .op_name = "OP_DELEGRETURN",
1582                .op_rsize_bop = nfsd4_only_status_rsize,
1583                .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1584        },
1585        [OP_GETATTR] = {
1586                .op_func = (nfsd4op_func)nfsd4_getattr,
1587                .op_flags = ALLOWED_ON_ABSENT_FS,
1588                .op_name = "OP_GETATTR",
1589        },
1590        [OP_GETFH] = {
1591                .op_func = (nfsd4op_func)nfsd4_getfh,
1592                .op_name = "OP_GETFH",
1593        },
1594        [OP_LINK] = {
1595                .op_func = (nfsd4op_func)nfsd4_link,
1596                .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1597                                | OP_CACHEME,
1598                .op_name = "OP_LINK",
1599                .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1600        },
1601        [OP_LOCK] = {
1602                .op_func = (nfsd4op_func)nfsd4_lock,
1603                .op_flags = OP_MODIFIES_SOMETHING,
1604                .op_name = "OP_LOCK",
1605                .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1606                .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1607        },
1608        [OP_LOCKT] = {
1609                .op_func = (nfsd4op_func)nfsd4_lockt,
1610                .op_name = "OP_LOCKT",
1611        },
1612        [OP_LOCKU] = {
1613                .op_func = (nfsd4op_func)nfsd4_locku,
1614                .op_flags = OP_MODIFIES_SOMETHING,
1615                .op_name = "OP_LOCKU",
1616                .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1617                .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1618        },
1619        [OP_LOOKUP] = {
1620                .op_func = (nfsd4op_func)nfsd4_lookup,
1621                .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1622                .op_name = "OP_LOOKUP",
1623        },
1624        [OP_LOOKUPP] = {
1625                .op_func = (nfsd4op_func)nfsd4_lookupp,
1626                .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1627                .op_name = "OP_LOOKUPP",
1628        },
1629        [OP_NVERIFY] = {
1630                .op_func = (nfsd4op_func)nfsd4_nverify,
1631                .op_name = "OP_NVERIFY",
1632        },
1633        [OP_OPEN] = {
1634                .op_func = (nfsd4op_func)nfsd4_open,
1635                .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1636                .op_name = "OP_OPEN",
1637                .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1638                .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1639        },
1640        [OP_OPEN_CONFIRM] = {
1641                .op_func = (nfsd4op_func)nfsd4_open_confirm,
1642                .op_flags = OP_MODIFIES_SOMETHING,
1643                .op_name = "OP_OPEN_CONFIRM",
1644                .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1645        },
1646        [OP_OPEN_DOWNGRADE] = {
1647                .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1648                .op_flags = OP_MODIFIES_SOMETHING,
1649                .op_name = "OP_OPEN_DOWNGRADE",
1650                .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1651                .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1652                .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1653        },
1654        [OP_PUTFH] = {
1655                .op_func = (nfsd4op_func)nfsd4_putfh,
1656                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1657                                | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1658                                | OP_CLEAR_STATEID,
1659                .op_name = "OP_PUTFH",
1660                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1661        },
1662        [OP_PUTPUBFH] = {
1663                .op_func = (nfsd4op_func)nfsd4_putrootfh,
1664                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1665                                | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1666                                | OP_CLEAR_STATEID,
1667                .op_name = "OP_PUTPUBFH",
1668                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1669        },
1670        [OP_PUTROOTFH] = {
1671                .op_func = (nfsd4op_func)nfsd4_putrootfh,
1672                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1673                                | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1674                                | OP_CLEAR_STATEID,
1675                .op_name = "OP_PUTROOTFH",
1676                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1677        },
1678        [OP_READ] = {
1679                .op_func = (nfsd4op_func)nfsd4_read,
1680                .op_flags = OP_MODIFIES_SOMETHING,
1681                .op_name = "OP_READ",
1682                .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1683                .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1684        },
1685        [OP_READDIR] = {
1686                .op_func = (nfsd4op_func)nfsd4_readdir,
1687                .op_flags = OP_MODIFIES_SOMETHING,
1688                .op_name = "OP_READDIR",
1689                .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1690        },
1691        [OP_READLINK] = {
1692                .op_func = (nfsd4op_func)nfsd4_readlink,
1693                .op_name = "OP_READLINK",
1694        },
1695        [OP_REMOVE] = {
1696                .op_func = (nfsd4op_func)nfsd4_remove,
1697                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1698                .op_name = "OP_REMOVE",
1699                .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1700        },
1701        [OP_RENAME] = {
1702                .op_func = (nfsd4op_func)nfsd4_rename,
1703                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1704                .op_name = "OP_RENAME",
1705                .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1706        },
1707        [OP_RENEW] = {
1708                .op_func = (nfsd4op_func)nfsd4_renew,
1709                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1710                                | OP_MODIFIES_SOMETHING,
1711                .op_name = "OP_RENEW",
1712                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1713
1714        },
1715        [OP_RESTOREFH] = {
1716                .op_func = (nfsd4op_func)nfsd4_restorefh,
1717                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1718                                | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1719                .op_name = "OP_RESTOREFH",
1720                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1721        },
1722        [OP_SAVEFH] = {
1723                .op_func = (nfsd4op_func)nfsd4_savefh,
1724                .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1725                .op_name = "OP_SAVEFH",
1726                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1727        },
1728        [OP_SECINFO] = {
1729                .op_func = (nfsd4op_func)nfsd4_secinfo,
1730                .op_flags = OP_HANDLES_WRONGSEC,
1731                .op_name = "OP_SECINFO",
1732        },
1733        [OP_SETATTR] = {
1734                .op_func = (nfsd4op_func)nfsd4_setattr,
1735                .op_name = "OP_SETATTR",
1736                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1737                .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1738                .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1739        },
1740        [OP_SETCLIENTID] = {
1741                .op_func = (nfsd4op_func)nfsd4_setclientid,
1742                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1743                                | OP_MODIFIES_SOMETHING | OP_CACHEME,
1744                .op_name = "OP_SETCLIENTID",
1745                .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1746        },
1747        [OP_SETCLIENTID_CONFIRM] = {
1748                .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1749                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1750                                | OP_MODIFIES_SOMETHING | OP_CACHEME,
1751                .op_name = "OP_SETCLIENTID_CONFIRM",
1752                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1753        },
1754        [OP_VERIFY] = {
1755                .op_func = (nfsd4op_func)nfsd4_verify,
1756                .op_name = "OP_VERIFY",
1757        },
1758        [OP_WRITE] = {
1759                .op_func = (nfsd4op_func)nfsd4_write,
1760                .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1761                .op_name = "OP_WRITE",
1762                .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1763                .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1764        },
1765        [OP_RELEASE_LOCKOWNER] = {
1766                .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1767                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1768                                | OP_MODIFIES_SOMETHING,
1769                .op_name = "OP_RELEASE_LOCKOWNER",
1770                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1771        },
1772
1773        /* NFSv4.1 operations */
1774        [OP_EXCHANGE_ID] = {
1775                .op_func = (nfsd4op_func)nfsd4_exchange_id,
1776                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1777                                | OP_MODIFIES_SOMETHING,
1778                .op_name = "OP_EXCHANGE_ID",
1779                .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1780        },
1781        [OP_BACKCHANNEL_CTL] = {
1782                .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1783                .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1784                .op_name = "OP_BACKCHANNEL_CTL",
1785                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1786        },
1787        [OP_BIND_CONN_TO_SESSION] = {
1788                .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1789                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1790                                | OP_MODIFIES_SOMETHING,
1791                .op_name = "OP_BIND_CONN_TO_SESSION",
1792                .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1793        },
1794        [OP_CREATE_SESSION] = {
1795                .op_func = (nfsd4op_func)nfsd4_create_session,
1796                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1797                                | OP_MODIFIES_SOMETHING,
1798                .op_name = "OP_CREATE_SESSION",
1799                .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1800        },
1801        [OP_DESTROY_SESSION] = {
1802                .op_func = (nfsd4op_func)nfsd4_destroy_session,
1803                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1804                                | OP_MODIFIES_SOMETHING,
1805                .op_name = "OP_DESTROY_SESSION",
1806                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1807        },
1808        [OP_SEQUENCE] = {
1809                .op_func = (nfsd4op_func)nfsd4_sequence,
1810                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1811                .op_name = "OP_SEQUENCE",
1812        },
1813        [OP_DESTROY_CLIENTID] = {
1814                .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1815                .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1816                                | OP_MODIFIES_SOMETHING,
1817                .op_name = "OP_DESTROY_CLIENTID",
1818                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1819        },
1820        [OP_RECLAIM_COMPLETE] = {
1821                .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1822                .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1823                .op_name = "OP_RECLAIM_COMPLETE",
1824                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1825        },
1826        [OP_SECINFO_NO_NAME] = {
1827                .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1828                .op_flags = OP_HANDLES_WRONGSEC,
1829                .op_name = "OP_SECINFO_NO_NAME",
1830        },
1831        [OP_TEST_STATEID] = {
1832                .op_func = (nfsd4op_func)nfsd4_test_stateid,
1833                .op_flags = ALLOWED_WITHOUT_FH,
1834                .op_name = "OP_TEST_STATEID",
1835        },
1836        [OP_FREE_STATEID] = {
1837                .op_func = (nfsd4op_func)nfsd4_free_stateid,
1838                .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1839                .op_name = "OP_FREE_STATEID",
1840                .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1841                .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1842        },
1843};
1844
1845#ifdef NFSD_DEBUG
1846static const char *nfsd4_op_name(unsigned opnum)
1847{
1848        if (opnum < ARRAY_SIZE(nfsd4_ops))
1849                return nfsd4_ops[opnum].op_name;
1850        return "unknown_operation";
1851}
1852#endif
1853
1854#define nfsd4_voidres                   nfsd4_voidargs
1855struct nfsd4_voidargs { int dummy; };
1856
1857static struct svc_procedure             nfsd_procedures4[2] = {
1858        [NFSPROC4_NULL] = {
1859                .pc_func = (svc_procfunc) nfsd4_proc_null,
1860                .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1861                .pc_argsize = sizeof(struct nfsd4_voidargs),
1862                .pc_ressize = sizeof(struct nfsd4_voidres),
1863                .pc_cachetype = RC_NOCACHE,
1864                .pc_xdrressize = 1,
1865        },
1866        [NFSPROC4_COMPOUND] = {
1867                .pc_func = (svc_procfunc) nfsd4_proc_compound,
1868                .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1869                .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1870                .pc_argsize = sizeof(struct nfsd4_compoundargs),
1871                .pc_ressize = sizeof(struct nfsd4_compoundres),
1872                .pc_release = nfsd4_release_compoundargs,
1873                .pc_cachetype = RC_NOCACHE,
1874                .pc_xdrressize = NFSD_BUFSIZE/4,
1875        },
1876};
1877
1878struct svc_version      nfsd_version4 = {
1879                .vs_vers        = 4,
1880                .vs_nproc       = 2,
1881                .vs_proc        = nfsd_procedures4,
1882                .vs_dispatch    = nfsd_dispatch,
1883                .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1884};
1885
1886/*
1887 * Local variables:
1888 *  c-basic-offset: 8
1889 * End:
1890 */
1891
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