fs/nfsd/nfs4proc.c

   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 #include "acl.h"
  45
  46 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  47 #include <linux/security.h>
  48
  49 static inline void
  50 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  51 {
  52         struct inode *inode = resfh->fh_dentry->d_inode;
  53         int status;
  54
  55         mutex_lock(&inode->i_mutex);
  56         status = security_inode_setsecctx(resfh->fh_dentry,
  57                 label->data, label->len);
  58         mutex_unlock(&inode->i_mutex);
  59
  60         if (status)
  61                 /*
  62                  * XXX: We should really fail the whole open, but we may
  63                  * already have created a new file, so it may be too
  64                  * late.  For now this seems the least of evils:
  65                  */
  66                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  67
  68         return;
  69 }
  70 #else
  71 static inline void
  72 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  73 { }
  74 #endif
  75
  76 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  77
  78 static u32 nfsd_attrmask[] = {
  79         NFSD_WRITEABLE_ATTRS_WORD0,
  80         NFSD_WRITEABLE_ATTRS_WORD1,
  81         NFSD_WRITEABLE_ATTRS_WORD2
  82 };
  83
  84 static u32 nfsd41_ex_attrmask[] = {
  85         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  86         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  87         NFSD_SUPPATTR_EXCLCREAT_WORD2
  88 };
  89
  90 static __be32
  91 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  92                    u32 *bmval, u32 *writable)
  93 {
  94         struct dentry *dentry = cstate->current_fh.fh_dentry;
  95
  96         /*
  97          * Check about attributes are supported by the NFSv4 server or not.
  98          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  99          */
 100         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 101             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 102             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 103                 return nfserr_attrnotsupp;
 104
 105         /*
 106          * Check FATTR4_WORD0_ACL can be supported
 107          * in current environment or not.
 108          */
 109         if (bmval[0] & FATTR4_WORD0_ACL) {
 110                 if (!IS_POSIXACL(dentry->d_inode))
 111                         return nfserr_attrnotsupp;
 112         }
 113
 114         /*
 115          * According to spec, read-only attributes return ERR_INVAL.
 116          */
 117         if (writable) {
 118                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 119                     (bmval[2] & ~writable[2]))
 120                         return nfserr_inval;
 121         }
 122
 123         return nfs_ok;
 124 }
 125
 126 static __be32
 127 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 128         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 129 {
 130         __be32 status = nfs_ok;
 131
 132         if (open->op_create == NFS4_OPEN_CREATE) {
 133                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 134                     || open->op_createmode == NFS4_CREATE_GUARDED)
 135                         status = check_attr_support(rqstp, cstate,
 136                                         open->op_bmval, nfsd_attrmask);
 137                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 138                         status = check_attr_support(rqstp, cstate,
 139                                         open->op_bmval, nfsd41_ex_attrmask);
 140         }
 141
 142         return status;
 143 }
 144
 145 static int
 146 is_create_with_attrs(struct nfsd4_open *open)
 147 {
 148         return open->op_create == NFS4_OPEN_CREATE
 149                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 150                     || open->op_createmode == NFS4_CREATE_GUARDED
 151                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 152 }
 153
 154 /*
 155  * if error occurs when setting the acl, just clear the acl bit
 156  * in the returned attr bitmap.
 157  */
 158 static void
 159 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 160                 struct nfs4_acl *acl, u32 *bmval)
 161 {
 162         __be32 status;
 163
 164         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 165         if (status)
 166                 /*
 167                  * We should probably fail the whole open at this point,
 168                  * but we've already created the file, so it's too late;
 169                  * So this seems the least of evils:
 170                  */
 171                 bmval[0] &= ~FATTR4_WORD0_ACL;
 172 }
 173
 174 static inline void
 175 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 176 {
 177         fh_put(dst);
 178         dget(src->fh_dentry);
 179         if (src->fh_export)
 180                 cache_get(&src->fh_export->h);
 181         *dst = *src;
 182 }
 183
 184 static __be32
 185 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 186 {
 187         __be32 status;
 188
 189         if (open->op_truncate &&
 190                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 191                 return nfserr_inval;
 192
 193         accmode |= NFSD_MAY_READ_IF_EXEC;
 194
 195         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 196                 accmode |= NFSD_MAY_READ;
 197         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 198                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 199         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 200                 accmode |= NFSD_MAY_WRITE;
 201
 202         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 203
 204         return status;
 205 }
 206
 207 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 208 {
 209         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 210
 211         if (S_ISREG(mode))
 212                 return nfs_ok;
 213         if (S_ISDIR(mode))
 214                 return nfserr_isdir;
 215         /*
 216          * Using err_symlink as our catch-all case may look odd; but
 217          * there's no other obvious error for this case in 4.0, and we
 218          * happen to know that it will cause the linux v4 client to do
 219          * the right thing on attempts to open something other than a
 220          * regular file.
 221          */
 222         return nfserr_symlink;
 223 }
 224
 225 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 226 {
 227         if (nfsd4_has_session(cstate))
 228                 return;
 229         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 230                         &resfh->fh_handle);
 231 }
 232
 233 static __be32
 234 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 235 {
 236         struct svc_fh *current_fh = &cstate->current_fh;
 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                 /*
 285                  * Note this may exit with the parent still locked.
 286                  * We will hold the lock until nfsd4_open's final
 287                  * lookup, to prevent renames or unlinks until we've had
 288                  * a chance to an acquire a delegation if appropriate.
 289                  */
 290                 status = nfsd_lookup(rqstp, current_fh,
 291                                      open->op_fname.data, open->op_fname.len, *resfh);
 292         if (status)
 293                 goto out;
 294         status = nfsd_check_obj_isreg(*resfh);
 295         if (status)
 296                 goto out;
 297
 298         if (is_create_with_attrs(open) && open->op_acl != NULL)
 299                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 300
 301         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 302         accmode = NFSD_MAY_NOP;
 303         if (open->op_created ||
 304                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 305                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 306         status = do_open_permission(rqstp, *resfh, open, accmode);
 307         set_change_info(&open->op_cinfo, current_fh);
 308 out:
 309         return status;
 310 }
 311
 312 static __be32
 313 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 314 {
 315         struct svc_fh *current_fh = &cstate->current_fh;
 316         __be32 status;
 317         int accmode = 0;
 318
 319         /* We don't know the target directory, and therefore can not
 320         * set the change info
 321         */
 322
 323         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 324
 325         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 326
 327         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 328                 (open->op_iattr.ia_size == 0);
 329         /*
 330          * In the delegation case, the client is telling us about an
 331          * open that it *already* performed locally, some time ago.  We
 332          * should let it succeed now if possible.
 333          *
 334          * In the case of a CLAIM_FH open, on the other hand, the client
 335          * may be counting on us to enforce permissions (the Linux 4.1
 336          * client uses this for normal opens, for example).
 337          */
 338         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 339                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 340
 341         status = do_open_permission(rqstp, current_fh, open, accmode);
 342
 343         return status;
 344 }
 345
 346 static void
 347 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 348 {
 349         struct nfsd4_sessionid *sid =
 350                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 351
 352         clid->cl_boot = sid->clientid.cl_boot;
 353         clid->cl_id = sid->clientid.cl_id;
 354 }
 355
 356 static __be32
 357 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 358            struct nfsd4_open *open)
 359 {
 360         __be32 status;
 361         struct svc_fh *resfh = NULL;
 362         struct nfsd4_compoundres *resp;
 363         struct net *net = SVC_NET(rqstp);
 364         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 365
 366         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 367                 (int)open->op_fname.len, open->op_fname.data,
 368                 open->op_openowner);
 369
 370         /* This check required by spec. */
 371         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 372                 return nfserr_inval;
 373
 374         open->op_created = 0;
 375         /*
 376          * RFC5661 18.51.3
 377          * Before RECLAIM_COMPLETE done, server should deny new lock
 378          */
 379         if (nfsd4_has_session(cstate) &&
 380             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 381                       &cstate->session->se_client->cl_flags) &&
 382             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 383                 return nfserr_grace;
 384
 385         if (nfsd4_has_session(cstate))
 386                 copy_clientid(&open->op_clientid, cstate->session);
 387
 388         nfs4_lock_state();
 389
 390         /* check seqid for replay. set nfs4_owner */
 391         resp = rqstp->rq_resp;
 392         status = nfsd4_process_open1(&resp->cstate, open, nn);
 393         if (status == nfserr_replay_me) {
 394                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 395                 fh_put(&cstate->current_fh);
 396                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 397                                 &rp->rp_openfh);
 398                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 399                 if (status)
 400                         dprintk("nfsd4_open: replay failed"
 401                                 " restoring previous filehandle\n");
 402                 else
 403                         status = nfserr_replay_me;
 404         }
 405         if (status)
 406                 goto out;
 407         if (open->op_xdr_error) {
 408                 status = open->op_xdr_error;
 409                 goto out;
 410         }
 411
 412         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 413         if (status)
 414                 goto out;
 415
 416         /* Openowner is now set, so sequence id will get bumped.  Now we need
 417          * these checks before we do any creates: */
 418         status = nfserr_grace;
 419         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 420                 goto out;
 421         status = nfserr_no_grace;
 422         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 423                 goto out;
 424
 425         switch (open->op_claim_type) {
 426                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 427                 case NFS4_OPEN_CLAIM_NULL:
 428                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 429                         if (status)
 430                                 goto out;
 431                         break;
 432                 case NFS4_OPEN_CLAIM_PREVIOUS:
 433                         status = nfs4_check_open_reclaim(&open->op_clientid,
 434                                                          cstate->minorversion,
 435                                                          nn);
 436                         if (status)
 437                                 goto out;
 438                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 439                 case NFS4_OPEN_CLAIM_FH:
 440                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 441                         status = do_open_fhandle(rqstp, cstate, open);
 442                         if (status)
 443                                 goto out;
 444                         resfh = &cstate->current_fh;
 445                         break;
 446                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 447                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 448                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 449                                 open->op_claim_type);
 450                         status = nfserr_notsupp;
 451                         goto out;
 452                 default:
 453                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 454                                 open->op_claim_type);
 455                         status = nfserr_inval;
 456                         goto out;
 457         }
 458         /*
 459          * nfsd4_process_open2() does the actual opening of the file.  If
 460          * successful, it (1) truncates the file if open->op_truncate was
 461          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 462          */
 463         status = nfsd4_process_open2(rqstp, resfh, open);
 464         WARN_ON(status && open->op_created);
 465 out:
 466         if (resfh && resfh != &cstate->current_fh) {
 467                 fh_dup2(&cstate->current_fh, resfh);
 468                 fh_put(resfh);
 469                 kfree(resfh);
 470         }
 471         nfsd4_cleanup_open_state(open, status);
 472         if (open->op_openowner && !nfsd4_has_session(cstate))
 473                 cstate->replay_owner = &open->op_openowner->oo_owner;
 474         nfsd4_bump_seqid(cstate, status);
 475         if (!cstate->replay_owner)
 476                 nfs4_unlock_state();
 477         return status;
 478 }
 479
 480 /*
 481  * OPEN is the only seqid-mutating operation whose decoding can fail
 482  * with a seqid-mutating error (specifically, decoding of user names in
 483  * the attributes).  Therefore we have to do some processing to look up
 484  * the stateowner so that we can bump the seqid.
 485  */
 486 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 487 {
 488         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 489
 490         if (!seqid_mutating_err(ntohl(op->status)))
 491                 return op->status;
 492         if (nfsd4_has_session(cstate))
 493                 return op->status;
 494         open->op_xdr_error = op->status;
 495         return nfsd4_open(rqstp, cstate, open);
 496 }
 497
 498 /*
 499  * filehandle-manipulating ops.
 500  */
 501 static __be32
 502 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 503             struct svc_fh **getfh)
 504 {
 505         if (!cstate->current_fh.fh_dentry)
 506                 return nfserr_nofilehandle;
 507
 508         *getfh = &cstate->current_fh;
 509         return nfs_ok;
 510 }
 511
 512 static __be32
 513 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 514             struct nfsd4_putfh *putfh)
 515 {
 516         fh_put(&cstate->current_fh);
 517         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 518         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 519                putfh->pf_fhlen);
 520         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 521 }
 522
 523 static __be32
 524 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 525                 void *arg)
 526 {
 527         __be32 status;
 528
 529         fh_put(&cstate->current_fh);
 530         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 531         return status;
 532 }
 533
 534 static __be32
 535 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 536                 void *arg)
 537 {
 538         if (!cstate->save_fh.fh_dentry)
 539                 return nfserr_restorefh;
 540
 541         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 542         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 543                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 544                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 545         }
 546         return nfs_ok;
 547 }
 548
 549 static __be32
 550 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 551              void *arg)
 552 {
 553         if (!cstate->current_fh.fh_dentry)
 554                 return nfserr_nofilehandle;
 555
 556         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 557         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 558                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 559                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 560         }
 561         return nfs_ok;
 562 }
 563
 564 /*
 565  * misc nfsv4 ops
 566  */
 567 static __be32
 568 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 569              struct nfsd4_access *access)
 570 {
 571         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 572                 return nfserr_inval;
 573
 574         access->ac_resp_access = access->ac_req_access;
 575         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 576                            &access->ac_supported);
 577 }
 578
 579 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 580 {
 581         __be32 verf[2];
 582         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 583
 584         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 585         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 586         memcpy(verifier->data, verf, sizeof(verifier->data));
 587 }
 588
 589 static __be32
 590 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 591              struct nfsd4_commit *commit)
 592 {
 593         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 594         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 595                              commit->co_count);
 596 }
 597
 598 static __be32
 599 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600              struct nfsd4_create *create)
 601 {
 602         struct svc_fh resfh;
 603         __be32 status;
 604         dev_t rdev;
 605
 606         fh_init(&resfh, NFS4_FHSIZE);
 607
 608         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 609                            NFSD_MAY_CREATE);
 610         if (status)
 611                 return status;
 612
 613         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 614                                     nfsd_attrmask);
 615         if (status)
 616                 return status;
 617
 618         switch (create->cr_type) {
 619         case NF4LNK:
 620                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 621                                       create->cr_name, create->cr_namelen,
 622                                       create->cr_linkname, create->cr_linklen,
 623                                       &resfh, &create->cr_iattr);
 624                 break;
 625
 626         case NF4BLK:
 627                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 628                 if (MAJOR(rdev) != create->cr_specdata1 ||
 629                     MINOR(rdev) != create->cr_specdata2)
 630                         return nfserr_inval;
 631                 status = nfsd_create(rqstp, &cstate->current_fh,
 632                                      create->cr_name, create->cr_namelen,
 633                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 634                 break;
 635
 636         case NF4CHR:
 637                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 638                 if (MAJOR(rdev) != create->cr_specdata1 ||
 639                     MINOR(rdev) != create->cr_specdata2)
 640                         return nfserr_inval;
 641                 status = nfsd_create(rqstp, &cstate->current_fh,
 642                                      create->cr_name, create->cr_namelen,
 643                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 644                 break;
 645
 646         case NF4SOCK:
 647                 status = nfsd_create(rqstp, &cstate->current_fh,
 648                                      create->cr_name, create->cr_namelen,
 649                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 650                 break;
 651
 652         case NF4FIFO:
 653                 status = nfsd_create(rqstp, &cstate->current_fh,
 654                                      create->cr_name, create->cr_namelen,
 655                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 656                 break;
 657
 658         case NF4DIR:
 659                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 660                 status = nfsd_create(rqstp, &cstate->current_fh,
 661                                      create->cr_name, create->cr_namelen,
 662                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 663                 break;
 664
 665         default:
 666                 status = nfserr_badtype;
 667         }
 668
 669         if (status)
 670                 goto out;
 671
 672         if (create->cr_label.len)
 673                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 674
 675         if (create->cr_acl != NULL)
 676                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 677                                 create->cr_bmval);
 678
 679         fh_unlock(&cstate->current_fh);
 680         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 681         fh_dup2(&cstate->current_fh, &resfh);
 682 out:
 683         fh_put(&resfh);
 684         return status;
 685 }
 686
 687 static __be32
 688 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 689               struct nfsd4_getattr *getattr)
 690 {
 691         __be32 status;
 692
 693         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 694         if (status)
 695                 return status;
 696
 697         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 698                 return nfserr_inval;
 699
 700         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 701         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 702         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 703
 704         getattr->ga_fhp = &cstate->current_fh;
 705         return nfs_ok;
 706 }
 707
 708 static __be32
 709 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 710            struct nfsd4_link *link)
 711 {
 712         __be32 status = nfserr_nofilehandle;
 713
 714         if (!cstate->save_fh.fh_dentry)
 715                 return status;
 716         status = nfsd_link(rqstp, &cstate->current_fh,
 717                            link->li_name, link->li_namelen, &cstate->save_fh);
 718         if (!status)
 719                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 720         return status;
 721 }
 722
 723 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 724 {
 725         struct svc_fh tmp_fh;
 726         __be32 ret;
 727
 728         fh_init(&tmp_fh, NFS4_FHSIZE);
 729         ret = exp_pseudoroot(rqstp, &tmp_fh);
 730         if (ret)
 731                 return ret;
 732         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 733                 fh_put(&tmp_fh);
 734                 return nfserr_noent;
 735         }
 736         fh_put(&tmp_fh);
 737         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 738 }
 739
 740 static __be32
 741 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 742               void *arg)
 743 {
 744         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 745 }
 746
 747 static __be32
 748 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 749              struct nfsd4_lookup *lookup)
 750 {
 751         return nfsd_lookup(rqstp, &cstate->current_fh,
 752                            lookup->lo_name, lookup->lo_len,
 753                            &cstate->current_fh);
 754 }
 755
 756 static __be32
 757 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 758            struct nfsd4_read *read)
 759 {
 760         __be32 status;
 761
 762         /* no need to check permission - this will be done in nfsd_read() */
 763
 764         read->rd_filp = NULL;
 765         if (read->rd_offset >= OFFSET_MAX)
 766                 return nfserr_inval;
 767
 768         /*
 769          * If we do a zero copy read, then a client will see read data
 770          * that reflects the state of the file *after* performing the
 771          * following compound.
 772          *
 773          * To ensure proper ordering, we therefore turn off zero copy if
 774          * the client wants us to do more in this compound:
 775          */
 776         if (!nfsd4_last_compound_op(rqstp))
 777                 rqstp->rq_splice_ok = false;
 778
 779         /* check stateid */
 780         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 781                                                  cstate, &read->rd_stateid,
 782                                                  RD_STATE, &read->rd_filp))) {
 783                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 784                 goto out;
 785         }
 786         status = nfs_ok;
 787 out:
 788         read->rd_rqstp = rqstp;
 789         read->rd_fhp = &cstate->current_fh;
 790         return status;
 791 }
 792
 793 static __be32
 794 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 795               struct nfsd4_readdir *readdir)
 796 {
 797         u64 cookie = readdir->rd_cookie;
 798         static const nfs4_verifier zeroverf;
 799
 800         /* no need to check permission - this will be done in nfsd_readdir() */
 801
 802         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 803                 return nfserr_inval;
 804
 805         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 806         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 807         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 808
 809         if ((cookie == 1) || (cookie == 2) ||
 810             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 811                 return nfserr_bad_cookie;
 812
 813         readdir->rd_rqstp = rqstp;
 814         readdir->rd_fhp = &cstate->current_fh;
 815         return nfs_ok;
 816 }
 817
 818 static __be32
 819 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 820                struct nfsd4_readlink *readlink)
 821 {
 822         readlink->rl_rqstp = rqstp;
 823         readlink->rl_fhp = &cstate->current_fh;
 824         return nfs_ok;
 825 }
 826
 827 static __be32
 828 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 829              struct nfsd4_remove *remove)
 830 {
 831         __be32 status;
 832
 833         if (locks_in_grace(SVC_NET(rqstp)))
 834                 return nfserr_grace;
 835         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 836                              remove->rm_name, remove->rm_namelen);
 837         if (!status) {
 838                 fh_unlock(&cstate->current_fh);
 839                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 840         }
 841         return status;
 842 }
 843
 844 static __be32
 845 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 846              struct nfsd4_rename *rename)
 847 {
 848         __be32 status = nfserr_nofilehandle;
 849
 850         if (!cstate->save_fh.fh_dentry)
 851                 return status;
 852         if (locks_in_grace(SVC_NET(rqstp)) &&
 853                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 854                 return nfserr_grace;
 855         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 856                              rename->rn_snamelen, &cstate->current_fh,
 857                              rename->rn_tname, rename->rn_tnamelen);
 858         if (status)
 859                 return status;
 860         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 861         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 862         return nfs_ok;
 863 }
 864
 865 static __be32
 866 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 867               struct nfsd4_secinfo *secinfo)
 868 {
 869         struct svc_fh resfh;
 870         struct svc_export *exp;
 871         struct dentry *dentry;
 872         __be32 err;
 873
 874         fh_init(&resfh, NFS4_FHSIZE);
 875         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 876         if (err)
 877                 return err;
 878         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 879                                     secinfo->si_name, secinfo->si_namelen,
 880                                     &exp, &dentry);
 881         if (err)
 882                 return err;
 883         fh_unlock(&cstate->current_fh);
 884         if (dentry->d_inode == NULL) {
 885                 exp_put(exp);
 886                 err = nfserr_noent;
 887         } else
 888                 secinfo->si_exp = exp;
 889         dput(dentry);
 890         if (cstate->minorversion)
 891                 /* See rfc 5661 section 2.6.3.1.1.8 */
 892                 fh_put(&cstate->current_fh);
 893         return err;
 894 }
 895
 896 static __be32
 897 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 898               struct nfsd4_secinfo_no_name *sin)
 899 {
 900         __be32 err;
 901
 902         switch (sin->sin_style) {
 903         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 904                 break;
 905         case NFS4_SECINFO_STYLE4_PARENT:
 906                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 907                 if (err)
 908                         return err;
 909                 break;
 910         default:
 911                 return nfserr_inval;
 912         }
 913         exp_get(cstate->current_fh.fh_export);
 914         sin->sin_exp = cstate->current_fh.fh_export;
 915         fh_put(&cstate->current_fh);
 916         return nfs_ok;
 917 }
 918
 919 static __be32
 920 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 921               struct nfsd4_setattr *setattr)
 922 {
 923         __be32 status = nfs_ok;
 924         int err;
 925
 926         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 927                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 928                         &setattr->sa_stateid, WR_STATE, NULL);
 929                 if (status) {
 930                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 931                         return status;
 932                 }
 933         }
 934         err = fh_want_write(&cstate->current_fh);
 935         if (err)
 936                 return nfserrno(err);
 937         status = nfs_ok;
 938
 939         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 940                                     nfsd_attrmask);
 941         if (status)
 942                 goto out;
 943
 944         if (setattr->sa_acl != NULL)
 945                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 946                                             setattr->sa_acl);
 947         if (status)
 948                 goto out;
 949         if (setattr->sa_label.len)
 950                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 951                                 &setattr->sa_label);
 952         if (status)
 953                 goto out;
 954         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 955                                 0, (time_t)0);
 956 out:
 957         fh_drop_write(&cstate->current_fh);
 958         return status;
 959 }
 960
 961 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 962 {
 963         int i = 1;
 964         int buflen = write->wr_buflen;
 965
 966         vec[0].iov_base = write->wr_head.iov_base;
 967         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 968         buflen -= vec[0].iov_len;
 969
 970         while (buflen) {
 971                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 972                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 973                 buflen -= vec[i].iov_len;
 974                 i++;
 975         }
 976         return i;
 977 }
 978
 979 static __be32
 980 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 981             struct nfsd4_write *write)
 982 {
 983         stateid_t *stateid = &write->wr_stateid;
 984         struct file *filp = NULL;
 985         __be32 status = nfs_ok;
 986         unsigned long cnt;
 987         int nvecs;
 988
 989         /* no need to check permission - this will be done in nfsd_write() */
 990
 991         if (write->wr_offset >= OFFSET_MAX)
 992                 return nfserr_inval;
 993
 994         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 995                                         cstate, stateid, WR_STATE, &filp);
 996         if (status) {
 997                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 998                 return status;
 999         }
1000
1001         cnt = write->wr_buflen;
1002         write->wr_how_written = write->wr_stable_how;
1003         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1004
1005         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1006         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1007
1008         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1009                              write->wr_offset, rqstp->rq_vec, nvecs,
1010                              &cnt, &write->wr_how_written);
1011         if (filp)
1012                 fput(filp);
1013
1014         write->wr_bytes_written = cnt;
1015
1016         return status;
1017 }
1018
1019 /* This routine never returns NFS_OK!  If there are no other errors, it
1020  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1021  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1022  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1023  */
1024 static __be32
1025 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1026              struct nfsd4_verify *verify)
1027 {
1028         __be32 *buf, *p;
1029         int count;
1030         __be32 status;
1031
1032         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1033         if (status)
1034                 return status;
1035
1036         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1037         if (status)
1038                 return status;
1039
1040         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1041             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1042                 return nfserr_inval;
1043         if (verify->ve_attrlen & 3)
1044                 return nfserr_inval;
1045
1046         /* count in words:
1047          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1048          */
1049         count = 4 + (verify->ve_attrlen >> 2);
1050         buf = kmalloc(count << 2, GFP_KERNEL);
1051         if (!buf)
1052                 return nfserr_jukebox;
1053
1054         p = buf;
1055         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1056                                     cstate->current_fh.fh_export,
1057                                     cstate->current_fh.fh_dentry,
1058                                     verify->ve_bmval,
1059                                     rqstp, 0);
1060         /*
1061          * If nfsd4_encode_fattr() ran out of space, assume that's because
1062          * the attributes are longer (hence different) than those given:
1063          */
1064         if (status == nfserr_resource)
1065                 status = nfserr_not_same;
1066         if (status)
1067                 goto out_kfree;
1068
1069         /* skip bitmap */
1070         p = buf + 1 + ntohl(buf[0]);
1071         status = nfserr_not_same;
1072         if (ntohl(*p++) != verify->ve_attrlen)
1073                 goto out_kfree;
1074         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1075                 status = nfserr_same;
1076
1077 out_kfree:
1078         kfree(buf);
1079         return status;
1080 }
1081
1082 static __be32
1083 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1084               struct nfsd4_verify *verify)
1085 {
1086         __be32 status;
1087
1088         status = _nfsd4_verify(rqstp, cstate, verify);
1089         return status == nfserr_not_same ? nfs_ok : status;
1090 }
1091
1092 static __be32
1093 nfsd4_verify(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_same ? nfs_ok : status;
1100 }
1101
1102 /*
1103  * NULL call.
1104  */
1105 static __be32
1106 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1107 {
1108         return nfs_ok;
1109 }
1110
1111 static inline void nfsd4_increment_op_stats(u32 opnum)
1112 {
1113         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1114                 nfsdstats.nfs4_opcount[opnum]++;
1115 }
1116
1117 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1118                               void *);
1119 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1120 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1121 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1122
1123 enum nfsd4_op_flags {
1124         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1125         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1126         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1127         /* For rfc 5661 section 2.6.3.1.1: */
1128         OP_HANDLES_WRONGSEC = 1 << 3,
1129         OP_IS_PUTFH_LIKE = 1 << 4,
1130         /*
1131          * These are the ops whose result size we estimate before
1132          * encoding, to avoid performing an op then not being able to
1133          * respond or cache a response.  This includes writes and setattrs
1134          * as well as the operations usually called "nonidempotent":
1135          */
1136         OP_MODIFIES_SOMETHING = 1 << 5,
1137         /*
1138          * Cache compounds containing these ops in the xid-based drc:
1139          * We use the DRC for compounds containing non-idempotent
1140          * operations, *except* those that are 4.1-specific (since
1141          * sessions provide their own EOS), and except for stateful
1142          * operations other than setclientid and setclientid_confirm
1143          * (since sequence numbers provide EOS for open, lock, etc in
1144          * the v4.0 case).
1145          */
1146         OP_CACHEME = 1 << 6,
1147         /*
1148          * These are ops which clear current state id.
1149          */
1150         OP_CLEAR_STATEID = 1 << 7,
1151 };
1152
1153 struct nfsd4_operation {
1154         nfsd4op_func op_func;
1155         u32 op_flags;
1156         char *op_name;
1157         /* Try to get response size before operation */
1158         nfsd4op_rsize op_rsize_bop;
1159         stateid_getter op_get_currentstateid;
1160         stateid_setter op_set_currentstateid;
1161 };
1162
1163 static struct nfsd4_operation nfsd4_ops[];
1164
1165 static const char *nfsd4_op_name(unsigned opnum);
1166
1167 /*
1168  * Enforce NFSv4.1 COMPOUND ordering rules:
1169  *
1170  * Also note, enforced elsewhere:
1171  *      - SEQUENCE other than as first op results in
1172  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1173  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1174  *        (Enforced in nfsd4_bind_conn_to_session().)
1175  *      - DESTROY_SESSION must be the final operation in a compound, if
1176  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1177  *        (Enforced in nfsd4_destroy_session().)
1178  */
1179 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1180 {
1181         struct nfsd4_op *op = &args->ops[0];
1182
1183         /* These ordering requirements don't apply to NFSv4.0: */
1184         if (args->minorversion == 0)
1185                 return nfs_ok;
1186         /* This is weird, but OK, not our problem: */
1187         if (args->opcnt == 0)
1188                 return nfs_ok;
1189         if (op->status == nfserr_op_illegal)
1190                 return nfs_ok;
1191         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1192                 return nfserr_op_not_in_session;
1193         if (op->opnum == OP_SEQUENCE)
1194                 return nfs_ok;
1195         if (args->opcnt != 1)
1196                 return nfserr_not_only_op;
1197         return nfs_ok;
1198 }
1199
1200 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1201 {
1202         return &nfsd4_ops[op->opnum];
1203 }
1204
1205 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1206 {
1207         if (op->opnum == OP_ILLEGAL)
1208                 return false;
1209         return OPDESC(op)->op_flags & OP_CACHEME;
1210 }
1211
1212 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1213 {
1214         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1215         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1216         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1217         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1218         struct nfsd4_operation *thisd;
1219         struct nfsd4_operation *nextd;
1220
1221         thisd = OPDESC(this);
1222         /*
1223          * Most ops check wronsec on our own; only the putfh-like ops
1224          * have special rules.
1225          */
1226         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1227                 return false;
1228         /*
1229          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1230          * put-filehandle operation if we're not going to use the
1231          * result:
1232          */
1233         if (argp->opcnt == resp->opcnt)
1234                 return false;
1235         if (next->opnum == OP_ILLEGAL)
1236                 return false;
1237         nextd = OPDESC(next);
1238         /*
1239          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1240          * errors themselves as necessary; others should check for them
1241          * now:
1242          */
1243         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1244 }
1245
1246 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1247                                struct nfsd4_compoundres *resp)
1248 {
1249         struct xdr_stream *xdr = &resp->xdr;
1250         struct xdr_buf *buf = &rqstp->rq_res;
1251         struct kvec *head = buf->head;
1252
1253         xdr->buf = buf;
1254         xdr->iov = head;
1255         xdr->p   = head->iov_base + head->iov_len;
1256         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1257         /* Tail and page_len should be zero at this point: */
1258         buf->len = buf->head[0].iov_len;
1259         xdr->scratch.iov_len = 0;
1260         xdr->page_ptr = buf->pages - 1;
1261         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1262                 - rqstp->rq_auth_slack;
1263 }
1264
1265 /*
1266  * COMPOUND call.
1267  */
1268 static __be32
1269 nfsd4_proc_compound(struct svc_rqst *rqstp,
1270                     struct nfsd4_compoundargs *args,
1271                     struct nfsd4_compoundres *resp)
1272 {
1273         struct nfsd4_op *op;
1274         struct nfsd4_operation *opdesc;
1275         struct nfsd4_compound_state *cstate = &resp->cstate;
1276         struct svc_fh *current_fh = &cstate->current_fh;
1277         struct svc_fh *save_fh = &cstate->save_fh;
1278         __be32          status;
1279
1280         svcxdr_init_encode(rqstp, resp);
1281         resp->tagp = resp->xdr.p;
1282         /* reserve space for: taglen, tag, and opcnt */
1283         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1284         resp->taglen = args->taglen;
1285         resp->tag = args->tag;
1286         resp->rqstp = rqstp;
1287         cstate->minorversion = args->minorversion;
1288         fh_init(current_fh, NFS4_FHSIZE);
1289         fh_init(save_fh, NFS4_FHSIZE);
1290         /*
1291          * Don't use the deferral mechanism for NFSv4; compounds make it
1292          * too hard to avoid non-idempotency problems.
1293          */
1294         rqstp->rq_usedeferral = 0;
1295
1296         /*
1297          * According to RFC3010, this takes precedence over all other errors.
1298          */
1299         status = nfserr_minor_vers_mismatch;
1300         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1301                 goto out;
1302
1303         status = nfs41_check_op_ordering(args);
1304         if (status) {
1305                 op = &args->ops[0];
1306                 op->status = status;
1307                 goto encode_op;
1308         }
1309
1310         while (!status && resp->opcnt < args->opcnt) {
1311                 op = &args->ops[resp->opcnt++];
1312
1313                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1314                         resp->opcnt, args->opcnt, op->opnum,
1315                         nfsd4_op_name(op->opnum));
1316                 /*
1317                  * The XDR decode routines may have pre-set op->status;
1318                  * for example, if there is a miscellaneous XDR error
1319                  * it will be set to nfserr_bad_xdr.
1320                  */
1321                 if (op->status) {
1322                         if (op->opnum == OP_OPEN)
1323                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1324                         goto encode_op;
1325                 }
1326
1327                 opdesc = OPDESC(op);
1328
1329                 if (!current_fh->fh_dentry) {
1330                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1331                                 op->status = nfserr_nofilehandle;
1332                                 goto encode_op;
1333                         }
1334                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1335                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1336                         op->status = nfserr_moved;
1337                         goto encode_op;
1338                 }
1339
1340                 fh_clear_wcc(current_fh);
1341
1342                 /* If op is non-idempotent */
1343                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1344                         /*
1345                          * Don't execute this op if we couldn't encode a
1346                          * succesful reply:
1347                          */
1348                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1349                         /*
1350                          * Plus if there's another operation, make sure
1351                          * we'll have space to at least encode an error:
1352                          */
1353                         if (resp->opcnt < args->opcnt)
1354                                 plen += COMPOUND_ERR_SLACK_SPACE;
1355                         op->status = nfsd4_check_resp_size(resp, plen);
1356                 }
1357
1358                 if (op->status)
1359                         goto encode_op;
1360
1361                 if (opdesc->op_get_currentstateid)
1362                         opdesc->op_get_currentstateid(cstate, &op->u);
1363                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1364
1365                 if (!op->status) {
1366                         if (opdesc->op_set_currentstateid)
1367                                 opdesc->op_set_currentstateid(cstate, &op->u);
1368
1369                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1370                                 clear_current_stateid(cstate);
1371
1372                         if (need_wrongsec_check(rqstp))
1373                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1374                 }
1375
1376 encode_op:
1377                 /* Only from SEQUENCE */
1378                 if (cstate->status == nfserr_replay_cache) {
1379                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1380                         status = op->status;
1381                         goto out;
1382                 }
1383                 if (op->status == nfserr_replay_me) {
1384                         op->replay = &cstate->replay_owner->so_replay;
1385                         nfsd4_encode_replay(&resp->xdr, op);
1386                         status = op->status = op->replay->rp_status;
1387                 } else {
1388                         nfsd4_encode_operation(resp, op);
1389                         status = op->status;
1390                 }
1391
1392                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1393                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1394                         be32_to_cpu(status));
1395
1396                 if (cstate->replay_owner) {
1397                         nfs4_unlock_state();
1398                         cstate->replay_owner = NULL;
1399                 }
1400                 /* XXX Ugh, we need to get rid of this kind of special case: */
1401                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1402                         fput(op->u.read.rd_filp);
1403
1404                 nfsd4_increment_op_stats(op->opnum);
1405         }
1406
1407         cstate->status = status;
1408         fh_put(current_fh);
1409         fh_put(save_fh);
1410         BUG_ON(cstate->replay_owner);
1411 out:
1412         /* Reset deferral mechanism for RPC deferrals */
1413         rqstp->rq_usedeferral = 1;
1414         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1415         return status;
1416 }
1417
1418 #define op_encode_hdr_size              (2)
1419 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1420 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1421 #define op_encode_change_info_maxsz     (5)
1422 #define nfs4_fattr_bitmap_maxsz         (4)
1423
1424 /* We'll fall back on returning no lockowner if run out of space: */
1425 #define op_encode_lockowner_maxsz       (0)
1426 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1427
1428 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1429
1430 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1431 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1432                                          op_encode_ace_maxsz)
1433
1434 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1435
1436 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1437 {
1438         return (op_encode_hdr_size) * sizeof(__be32);
1439 }
1440
1441 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1442 {
1443         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1444 }
1445
1446 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1447 {
1448         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1449 }
1450
1451 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1452 {
1453         return (op_encode_hdr_size + op_encode_change_info_maxsz
1454                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1455 }
1456
1457 /*
1458  * Note since this is an idempotent operation we won't insist on failing
1459  * the op prematurely if the estimate is too large.  We may turn off splice
1460  * reads unnecessarily.
1461  */
1462 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1463                                       struct nfsd4_op *op)
1464 {
1465         u32 *bmap = op->u.getattr.ga_bmval;
1466         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1467         u32 ret = 0;
1468
1469         if (bmap0 & FATTR4_WORD0_ACL)
1470                 return svc_max_payload(rqstp);
1471         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1472                 return svc_max_payload(rqstp);
1473
1474         if (bmap1 & FATTR4_WORD1_OWNER) {
1475                 ret += IDMAP_NAMESZ + 4;
1476                 bmap1 &= ~FATTR4_WORD1_OWNER;
1477         }
1478         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1479                 ret += IDMAP_NAMESZ + 4;
1480                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1481         }
1482         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1483                 ret += NFS4_FHSIZE + 4;
1484                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1485         }
1486         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1487                 ret += NFSD4_MAX_SEC_LABEL_LEN + 12;
1488                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1489         }
1490         /*
1491          * Largest of remaining attributes are 16 bytes (e.g.,
1492          * supported_attributes)
1493          */
1494         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1495         /* bitmask, length */
1496         ret += 20;
1497         return ret;
1498 }
1499
1500 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1501 {
1502         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1503                 * sizeof(__be32);
1504 }
1505
1506 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1507 {
1508         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1509                 * sizeof(__be32);
1510 }
1511
1512 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1513 {
1514         return (op_encode_hdr_size + op_encode_stateid_maxsz
1515                 + op_encode_change_info_maxsz + 1
1516                 + nfs4_fattr_bitmap_maxsz
1517                 + op_encode_delegation_maxsz) * sizeof(__be32);
1518 }
1519
1520 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1521 {
1522         u32 maxcount = 0, rlen = 0;
1523
1524         maxcount = svc_max_payload(rqstp);
1525         rlen = op->u.read.rd_length;
1526
1527         if (rlen > maxcount)
1528                 rlen = maxcount;
1529
1530         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1531 }
1532
1533 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1534 {
1535         u32 maxcount = svc_max_payload(rqstp);
1536         u32 rlen = op->u.readdir.rd_maxcount;
1537
1538         if (rlen > maxcount)
1539                 rlen = maxcount;
1540
1541         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1542                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1543 }
1544
1545 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1546 {
1547         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1548                 * sizeof(__be32);
1549 }
1550
1551 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1552 {
1553         return (op_encode_hdr_size + op_encode_change_info_maxsz
1554                 + op_encode_change_info_maxsz) * sizeof(__be32);
1555 }
1556
1557 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1558                                        struct nfsd4_op *op)
1559 {
1560         return (op_encode_hdr_size
1561                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1562 }
1563
1564 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1565 {
1566         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1567 }
1568
1569 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1570 {
1571         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1572                                                                 sizeof(__be32);
1573 }
1574
1575 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1576 {
1577         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1578 }
1579
1580 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1581 {
1582         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1583                 1 + 1 + /* eir_flags, spr_how */\
1584                 4 + /* spo_must_enforce & _allow with bitmap */\
1585                 2 + /*eir_server_owner.so_minor_id */\
1586                 /* eir_server_owner.so_major_id<> */\
1587                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1588                 /* eir_server_scope<> */\
1589                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1590                 1 + /* eir_server_impl_id array length */\
1591                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1592 }
1593
1594 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1595 {
1596         return (op_encode_hdr_size + \
1597                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1598                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1599 }
1600
1601 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1602 {
1603         return (op_encode_hdr_size + \
1604                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1605                 2 + /* csr_sequence, csr_flags */\
1606                 op_encode_channel_attrs_maxsz + \
1607                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1608 }
1609
1610 static struct nfsd4_operation nfsd4_ops[] = {
1611         [OP_ACCESS] = {
1612                 .op_func = (nfsd4op_func)nfsd4_access,
1613                 .op_name = "OP_ACCESS",
1614         },
1615         [OP_CLOSE] = {
1616                 .op_func = (nfsd4op_func)nfsd4_close,
1617                 .op_flags = OP_MODIFIES_SOMETHING,
1618                 .op_name = "OP_CLOSE",
1619                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1620                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1621                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1622         },
1623         [OP_COMMIT] = {
1624                 .op_func = (nfsd4op_func)nfsd4_commit,
1625                 .op_flags = OP_MODIFIES_SOMETHING,
1626                 .op_name = "OP_COMMIT",
1627                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1628         },
1629         [OP_CREATE] = {
1630                 .op_func = (nfsd4op_func)nfsd4_create,
1631                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1632                 .op_name = "OP_CREATE",
1633                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1634         },
1635         [OP_DELEGRETURN] = {
1636                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1637                 .op_flags = OP_MODIFIES_SOMETHING,
1638                 .op_name = "OP_DELEGRETURN",
1639                 .op_rsize_bop = nfsd4_only_status_rsize,
1640                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1641         },
1642         [OP_GETATTR] = {
1643                 .op_func = (nfsd4op_func)nfsd4_getattr,
1644                 .op_flags = ALLOWED_ON_ABSENT_FS,
1645                 .op_rsize_bop = nfsd4_getattr_rsize,
1646                 .op_name = "OP_GETATTR",
1647         },
1648         [OP_GETFH] = {
1649                 .op_func = (nfsd4op_func)nfsd4_getfh,
1650                 .op_name = "OP_GETFH",
1651         },
1652         [OP_LINK] = {
1653                 .op_func = (nfsd4op_func)nfsd4_link,
1654                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1655                                 | OP_CACHEME,
1656                 .op_name = "OP_LINK",
1657                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1658         },
1659         [OP_LOCK] = {
1660                 .op_func = (nfsd4op_func)nfsd4_lock,
1661                 .op_flags = OP_MODIFIES_SOMETHING,
1662                 .op_name = "OP_LOCK",
1663                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1664                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1665         },
1666         [OP_LOCKT] = {
1667                 .op_func = (nfsd4op_func)nfsd4_lockt,
1668                 .op_name = "OP_LOCKT",
1669         },
1670         [OP_LOCKU] = {
1671                 .op_func = (nfsd4op_func)nfsd4_locku,
1672                 .op_flags = OP_MODIFIES_SOMETHING,
1673                 .op_name = "OP_LOCKU",
1674                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1675                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1676         },
1677         [OP_LOOKUP] = {
1678                 .op_func = (nfsd4op_func)nfsd4_lookup,
1679                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1680                 .op_name = "OP_LOOKUP",
1681         },
1682         [OP_LOOKUPP] = {
1683                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1684                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1685                 .op_name = "OP_LOOKUPP",
1686         },
1687         [OP_NVERIFY] = {
1688                 .op_func = (nfsd4op_func)nfsd4_nverify,
1689                 .op_name = "OP_NVERIFY",
1690         },
1691         [OP_OPEN] = {
1692                 .op_func = (nfsd4op_func)nfsd4_open,
1693                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1694                 .op_name = "OP_OPEN",
1695                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1696                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1697         },
1698         [OP_OPEN_CONFIRM] = {
1699                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1700                 .op_flags = OP_MODIFIES_SOMETHING,
1701                 .op_name = "OP_OPEN_CONFIRM",
1702                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1703         },
1704         [OP_OPEN_DOWNGRADE] = {
1705                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1706                 .op_flags = OP_MODIFIES_SOMETHING,
1707                 .op_name = "OP_OPEN_DOWNGRADE",
1708                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1709                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1710                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1711         },
1712         [OP_PUTFH] = {
1713                 .op_func = (nfsd4op_func)nfsd4_putfh,
1714                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1715                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1716                 .op_name = "OP_PUTFH",
1717                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1718         },
1719         [OP_PUTPUBFH] = {
1720                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1721                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1722                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1723                 .op_name = "OP_PUTPUBFH",
1724                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1725         },
1726         [OP_PUTROOTFH] = {
1727                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1728                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1729                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1730                 .op_name = "OP_PUTROOTFH",
1731                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1732         },
1733         [OP_READ] = {
1734                 .op_func = (nfsd4op_func)nfsd4_read,
1735                 .op_name = "OP_READ",
1736                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1737                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1738         },
1739         [OP_READDIR] = {
1740                 .op_func = (nfsd4op_func)nfsd4_readdir,
1741                 .op_name = "OP_READDIR",
1742                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1743         },
1744         [OP_READLINK] = {
1745                 .op_func = (nfsd4op_func)nfsd4_readlink,
1746                 .op_name = "OP_READLINK",
1747         },
1748         [OP_REMOVE] = {
1749                 .op_func = (nfsd4op_func)nfsd4_remove,
1750                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1751                 .op_name = "OP_REMOVE",
1752                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1753         },
1754         [OP_RENAME] = {
1755                 .op_func = (nfsd4op_func)nfsd4_rename,
1756                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1757                 .op_name = "OP_RENAME",
1758                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1759         },
1760         [OP_RENEW] = {
1761                 .op_func = (nfsd4op_func)nfsd4_renew,
1762                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1763                                 | OP_MODIFIES_SOMETHING,
1764                 .op_name = "OP_RENEW",
1765                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1766
1767         },
1768         [OP_RESTOREFH] = {
1769                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1770                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1771                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1772                 .op_name = "OP_RESTOREFH",
1773                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1774         },
1775         [OP_SAVEFH] = {
1776                 .op_func = (nfsd4op_func)nfsd4_savefh,
1777                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1778                 .op_name = "OP_SAVEFH",
1779                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1780         },
1781         [OP_SECINFO] = {
1782                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1783                 .op_flags = OP_HANDLES_WRONGSEC,
1784                 .op_name = "OP_SECINFO",
1785         },
1786         [OP_SETATTR] = {
1787                 .op_func = (nfsd4op_func)nfsd4_setattr,
1788                 .op_name = "OP_SETATTR",
1789                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1790                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1791                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1792         },
1793         [OP_SETCLIENTID] = {
1794                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1795                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1796                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1797                 .op_name = "OP_SETCLIENTID",
1798                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1799         },
1800         [OP_SETCLIENTID_CONFIRM] = {
1801                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1802                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1803                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1804                 .op_name = "OP_SETCLIENTID_CONFIRM",
1805                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1806         },
1807         [OP_VERIFY] = {
1808                 .op_func = (nfsd4op_func)nfsd4_verify,
1809                 .op_name = "OP_VERIFY",
1810         },
1811         [OP_WRITE] = {
1812                 .op_func = (nfsd4op_func)nfsd4_write,
1813                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1814                 .op_name = "OP_WRITE",
1815                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1816                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1817         },
1818         [OP_RELEASE_LOCKOWNER] = {
1819                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1820                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1821                                 | OP_MODIFIES_SOMETHING,
1822                 .op_name = "OP_RELEASE_LOCKOWNER",
1823                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1824         },
1825
1826         /* NFSv4.1 operations */
1827         [OP_EXCHANGE_ID] = {
1828                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1829                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1830                                 | OP_MODIFIES_SOMETHING,
1831                 .op_name = "OP_EXCHANGE_ID",
1832                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1833         },
1834         [OP_BACKCHANNEL_CTL] = {
1835                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1836                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1837                 .op_name = "OP_BACKCHANNEL_CTL",
1838                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1839         },
1840         [OP_BIND_CONN_TO_SESSION] = {
1841                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1842                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1843                                 | OP_MODIFIES_SOMETHING,
1844                 .op_name = "OP_BIND_CONN_TO_SESSION",
1845                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1846         },
1847         [OP_CREATE_SESSION] = {
1848                 .op_func = (nfsd4op_func)nfsd4_create_session,
1849                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1850                                 | OP_MODIFIES_SOMETHING,
1851                 .op_name = "OP_CREATE_SESSION",
1852                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1853         },
1854         [OP_DESTROY_SESSION] = {
1855                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1856                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1857                                 | OP_MODIFIES_SOMETHING,
1858                 .op_name = "OP_DESTROY_SESSION",
1859                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1860         },
1861         [OP_SEQUENCE] = {
1862                 .op_func = (nfsd4op_func)nfsd4_sequence,
1863                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1864                 .op_name = "OP_SEQUENCE",
1865                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
1866         },
1867         [OP_DESTROY_CLIENTID] = {
1868                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1869                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1870                                 | OP_MODIFIES_SOMETHING,
1871                 .op_name = "OP_DESTROY_CLIENTID",
1872                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1873         },
1874         [OP_RECLAIM_COMPLETE] = {
1875                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1876                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1877                 .op_name = "OP_RECLAIM_COMPLETE",
1878                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1879         },
1880         [OP_SECINFO_NO_NAME] = {
1881                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1882                 .op_flags = OP_HANDLES_WRONGSEC,
1883                 .op_name = "OP_SECINFO_NO_NAME",
1884         },
1885         [OP_TEST_STATEID] = {
1886                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1887                 .op_flags = ALLOWED_WITHOUT_FH,
1888                 .op_name = "OP_TEST_STATEID",
1889         },
1890         [OP_FREE_STATEID] = {
1891                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1892                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1893                 .op_name = "OP_FREE_STATEID",
1894                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1895                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1896         },
1897 };
1898
1899 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
1900 {
1901         struct nfsd4_operation *opdesc;
1902         nfsd4op_rsize estimator;
1903
1904         if (op->opnum == OP_ILLEGAL)
1905                 return op_encode_hdr_size * sizeof(__be32);
1906         opdesc = OPDESC(op);
1907         estimator = opdesc->op_rsize_bop;
1908         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
1909 }
1910
1911 void warn_on_nonidempotent_op(struct nfsd4_op *op)
1912 {
1913         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
1914                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
1915                         op->opnum, nfsd4_op_name(op->opnum));
1916                 WARN_ON_ONCE(1);
1917         }
1918 }
1919
1920 static const char *nfsd4_op_name(unsigned opnum)
1921 {
1922         if (opnum < ARRAY_SIZE(nfsd4_ops))
1923                 return nfsd4_ops[opnum].op_name;
1924         return "unknown_operation";
1925 }
1926
1927 #define nfsd4_voidres                   nfsd4_voidargs
1928 struct nfsd4_voidargs { int dummy; };
1929
1930 static struct svc_procedure             nfsd_procedures4[2] = {
1931         [NFSPROC4_NULL] = {
1932                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1933                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1934                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1935                 .pc_ressize = sizeof(struct nfsd4_voidres),
1936                 .pc_cachetype = RC_NOCACHE,
1937                 .pc_xdrressize = 1,
1938         },
1939         [NFSPROC4_COMPOUND] = {
1940                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1941                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1942                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1943                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1944                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1945                 .pc_release = nfsd4_release_compoundargs,
1946                 .pc_cachetype = RC_NOCACHE,
1947                 .pc_xdrressize = NFSD_BUFSIZE/4,
1948         },
1949 };
1950
1951 struct svc_version      nfsd_version4 = {
1952                 .vs_vers        = 4,
1953                 .vs_nproc       = 2,
1954                 .vs_proc        = nfsd_procedures4,
1955                 .vs_dispatch    = nfsd_dispatch,
1956                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1957                 .vs_rpcb_optnl  = 1,
1958 };
1959
1960 /*
1961  * Local variables:
1962  *  c-basic-offset: 8
1963  * End:
1964  */