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/fs_struct.h>
  36 #include <linux/file.h>
  37 #include <linux/falloc.h>
  38 #include <linux/slab.h>
  39
  40 #include "idmap.h"
  41 #include "cache.h"
  42 #include "xdr4.h"
  43 #include "vfs.h"
  44 #include "current_stateid.h"
  45 #include "netns.h"
  46 #include "acl.h"
  47 #include "pnfs.h"
  48 #include "trace.h"
  49
  50 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  51 #include <linux/security.h>
  52
  53 static inline void
  54 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  55 {
  56         struct inode *inode = d_inode(resfh->fh_dentry);
  57         int status;
  58
  59         inode_lock(inode);
  60         status = security_inode_setsecctx(resfh->fh_dentry,
  61                 label->data, label->len);
  62         inode_unlock(inode);
  63
  64         if (status)
  65                 /*
  66                  * XXX: We should really fail the whole open, but we may
  67                  * already have created a new file, so it may be too
  68                  * late.  For now this seems the least of evils:
  69                  */
  70                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  71
  72         return;
  73 }
  74 #else
  75 static inline void
  76 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  77 { }
  78 #endif
  79
  80 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  81
  82 static u32 nfsd_attrmask[] = {
  83         NFSD_WRITEABLE_ATTRS_WORD0,
  84         NFSD_WRITEABLE_ATTRS_WORD1,
  85         NFSD_WRITEABLE_ATTRS_WORD2
  86 };
  87
  88 static u32 nfsd41_ex_attrmask[] = {
  89         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  90         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  91         NFSD_SUPPATTR_EXCLCREAT_WORD2
  92 };
  93
  94 static __be32
  95 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  96                    u32 *bmval, u32 *writable)
  97 {
  98         struct dentry *dentry = cstate->current_fh.fh_dentry;
  99         struct svc_export *exp = cstate->current_fh.fh_export;
 100
 101         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
 102                 return nfserr_attrnotsupp;
 103         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
 104                 return nfserr_attrnotsupp;
 105         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
 106                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
 107                 return nfserr_attrnotsupp;
 108         if (writable && !bmval_is_subset(bmval, writable))
 109                 return nfserr_inval;
 110         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
 111                         (bmval[1] & FATTR4_WORD1_MODE))
 112                 return nfserr_inval;
 113         return nfs_ok;
 114 }
 115
 116 static __be32
 117 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 118         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 119 {
 120         __be32 status = nfs_ok;
 121
 122         if (open->op_create == NFS4_OPEN_CREATE) {
 123                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 124                     || open->op_createmode == NFS4_CREATE_GUARDED)
 125                         status = check_attr_support(rqstp, cstate,
 126                                         open->op_bmval, nfsd_attrmask);
 127                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 128                         status = check_attr_support(rqstp, cstate,
 129                                         open->op_bmval, nfsd41_ex_attrmask);
 130         }
 131
 132         return status;
 133 }
 134
 135 static int
 136 is_create_with_attrs(struct nfsd4_open *open)
 137 {
 138         return open->op_create == NFS4_OPEN_CREATE
 139                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 140                     || open->op_createmode == NFS4_CREATE_GUARDED
 141                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 142 }
 143
 144 /*
 145  * if error occurs when setting the acl, just clear the acl bit
 146  * in the returned attr bitmap.
 147  */
 148 static void
 149 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 150                 struct nfs4_acl *acl, u32 *bmval)
 151 {
 152         __be32 status;
 153
 154         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 155         if (status)
 156                 /*
 157                  * We should probably fail the whole open at this point,
 158                  * but we've already created the file, so it's too late;
 159                  * So this seems the least of evils:
 160                  */
 161                 bmval[0] &= ~FATTR4_WORD0_ACL;
 162 }
 163
 164 static inline void
 165 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 166 {
 167         fh_put(dst);
 168         dget(src->fh_dentry);
 169         if (src->fh_export)
 170                 exp_get(src->fh_export);
 171         *dst = *src;
 172 }
 173
 174 static __be32
 175 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 176 {
 177         __be32 status;
 178
 179         if (open->op_truncate &&
 180                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 181                 return nfserr_inval;
 182
 183         accmode |= NFSD_MAY_READ_IF_EXEC;
 184
 185         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 186                 accmode |= NFSD_MAY_READ;
 187         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 188                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 189         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 190                 accmode |= NFSD_MAY_WRITE;
 191
 192         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 193
 194         return status;
 195 }
 196
 197 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 198 {
 199         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 200
 201         if (S_ISREG(mode))
 202                 return nfs_ok;
 203         if (S_ISDIR(mode))
 204                 return nfserr_isdir;
 205         /*
 206          * Using err_symlink as our catch-all case may look odd; but
 207          * there's no other obvious error for this case in 4.0, and we
 208          * happen to know that it will cause the linux v4 client to do
 209          * the right thing on attempts to open something other than a
 210          * regular file.
 211          */
 212         return nfserr_symlink;
 213 }
 214
 215 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 216 {
 217         if (nfsd4_has_session(cstate))
 218                 return;
 219         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 220                         &resfh->fh_handle);
 221 }
 222
 223 static __be32
 224 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 225 {
 226         struct svc_fh *current_fh = &cstate->current_fh;
 227         int accmode;
 228         __be32 status;
 229
 230         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 231         if (!*resfh)
 232                 return nfserr_jukebox;
 233         fh_init(*resfh, NFS4_FHSIZE);
 234         open->op_truncate = 0;
 235
 236         if (open->op_create) {
 237                 /* FIXME: check session persistence and pnfs flags.
 238                  * The nfsv4.1 spec requires the following semantics:
 239                  *
 240                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 241                  * Reply Cache  | server |                 |
 242                  * -------------+--------+-----------------+--------------------
 243                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 244                  *              |        |                 | (SHOULD)
 245                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 246                  *              |        |                 | (SHOULD NOT)
 247                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 248                  * yes          | no     | GUARDED4        | GUARDED4
 249                  * yes          | yes    | GUARDED4        | GUARDED4
 250                  */
 251
 252                 /*
 253                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 254                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 255                  */
 256                 current->fs->umask = open->op_umask;
 257                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 258                                         open->op_fname.len, &open->op_iattr,
 259                                         *resfh, open->op_createmode,
 260                                         (u32 *)open->op_verf.data,
 261                                         &open->op_truncate, &open->op_created);
 262                 current->fs->umask = 0;
 263
 264                 if (!status && open->op_label.len)
 265                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 266
 267                 /*
 268                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 269                  * use the returned bitmask to indicate which attributes
 270                  * we used to store the verifier:
 271                  */
 272                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 273                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 274                                                 FATTR4_WORD1_TIME_MODIFY);
 275         } else
 276                 /*
 277                  * Note this may exit with the parent still locked.
 278                  * We will hold the lock until nfsd4_open's final
 279                  * lookup, to prevent renames or unlinks until we've had
 280                  * a chance to an acquire a delegation if appropriate.
 281                  */
 282                 status = nfsd_lookup(rqstp, current_fh,
 283                                      open->op_fname.data, open->op_fname.len, *resfh);
 284         if (status)
 285                 goto out;
 286         status = nfsd_check_obj_isreg(*resfh);
 287         if (status)
 288                 goto out;
 289
 290         if (is_create_with_attrs(open) && open->op_acl != NULL)
 291                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 292
 293         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 294         accmode = NFSD_MAY_NOP;
 295         if (open->op_created ||
 296                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 297                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 298         status = do_open_permission(rqstp, *resfh, open, accmode);
 299         set_change_info(&open->op_cinfo, current_fh);
 300 out:
 301         return status;
 302 }
 303
 304 static __be32
 305 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 306 {
 307         struct svc_fh *current_fh = &cstate->current_fh;
 308         __be32 status;
 309         int accmode = 0;
 310
 311         /* We don't know the target directory, and therefore can not
 312         * set the change info
 313         */
 314
 315         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 316
 317         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 318
 319         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 320                 (open->op_iattr.ia_size == 0);
 321         /*
 322          * In the delegation case, the client is telling us about an
 323          * open that it *already* performed locally, some time ago.  We
 324          * should let it succeed now if possible.
 325          *
 326          * In the case of a CLAIM_FH open, on the other hand, the client
 327          * may be counting on us to enforce permissions (the Linux 4.1
 328          * client uses this for normal opens, for example).
 329          */
 330         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 331                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 332
 333         status = do_open_permission(rqstp, current_fh, open, accmode);
 334
 335         return status;
 336 }
 337
 338 static void
 339 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 340 {
 341         struct nfsd4_sessionid *sid =
 342                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 343
 344         clid->cl_boot = sid->clientid.cl_boot;
 345         clid->cl_id = sid->clientid.cl_id;
 346 }
 347
 348 static __be32
 349 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 350            union nfsd4_op_u *u)
 351 {
 352         struct nfsd4_open *open = &u->open;
 353         __be32 status;
 354         struct svc_fh *resfh = NULL;
 355         struct net *net = SVC_NET(rqstp);
 356         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 357         bool reclaim = false;
 358
 359         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 360                 (int)open->op_fname.len, open->op_fname.data,
 361                 open->op_openowner);
 362
 363         /* This check required by spec. */
 364         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 365                 return nfserr_inval;
 366
 367         open->op_created = 0;
 368         /*
 369          * RFC5661 18.51.3
 370          * Before RECLAIM_COMPLETE done, server should deny new lock
 371          */
 372         if (nfsd4_has_session(cstate) &&
 373             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 374                       &cstate->session->se_client->cl_flags) &&
 375             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 376                 return nfserr_grace;
 377
 378         if (nfsd4_has_session(cstate))
 379                 copy_clientid(&open->op_clientid, cstate->session);
 380
 381         /* check seqid for replay. set nfs4_owner */
 382         status = nfsd4_process_open1(cstate, open, nn);
 383         if (status == nfserr_replay_me) {
 384                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 385                 fh_put(&cstate->current_fh);
 386                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 387                                 &rp->rp_openfh);
 388                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 389                 if (status)
 390                         dprintk("nfsd4_open: replay failed"
 391                                 " restoring previous filehandle\n");
 392                 else
 393                         status = nfserr_replay_me;
 394         }
 395         if (status)
 396                 goto out;
 397         if (open->op_xdr_error) {
 398                 status = open->op_xdr_error;
 399                 goto out;
 400         }
 401
 402         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 403         if (status)
 404                 goto out;
 405
 406         /* Openowner is now set, so sequence id will get bumped.  Now we need
 407          * these checks before we do any creates: */
 408         status = nfserr_grace;
 409         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 410                 goto out;
 411         status = nfserr_no_grace;
 412         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 413                 goto out;
 414
 415         switch (open->op_claim_type) {
 416                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 417                 case NFS4_OPEN_CLAIM_NULL:
 418                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 419                         if (status)
 420                                 goto out;
 421                         break;
 422                 case NFS4_OPEN_CLAIM_PREVIOUS:
 423                         status = nfs4_check_open_reclaim(&open->op_clientid,
 424                                                          cstate, nn);
 425                         if (status)
 426                                 goto out;
 427                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 428                         reclaim = true;
 429                 case NFS4_OPEN_CLAIM_FH:
 430                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 431                         status = do_open_fhandle(rqstp, cstate, open);
 432                         if (status)
 433                                 goto out;
 434                         resfh = &cstate->current_fh;
 435                         break;
 436                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 437                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 438                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 439                                 open->op_claim_type);
 440                         status = nfserr_notsupp;
 441                         goto out;
 442                 default:
 443                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 444                                 open->op_claim_type);
 445                         status = nfserr_inval;
 446                         goto out;
 447         }
 448         /*
 449          * nfsd4_process_open2() does the actual opening of the file.  If
 450          * successful, it (1) truncates the file if open->op_truncate was
 451          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 452          */
 453         status = nfsd4_process_open2(rqstp, resfh, open);
 454         WARN(status && open->op_created,
 455              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 456              be32_to_cpu(status));
 457         if (reclaim && !status)
 458                 nn->somebody_reclaimed = true;
 459 out:
 460         if (resfh && resfh != &cstate->current_fh) {
 461                 fh_dup2(&cstate->current_fh, resfh);
 462                 fh_put(resfh);
 463                 kfree(resfh);
 464         }
 465         nfsd4_cleanup_open_state(cstate, open);
 466         nfsd4_bump_seqid(cstate, status);
 467         return status;
 468 }
 469
 470 /*
 471  * OPEN is the only seqid-mutating operation whose decoding can fail
 472  * with a seqid-mutating error (specifically, decoding of user names in
 473  * the attributes).  Therefore we have to do some processing to look up
 474  * the stateowner so that we can bump the seqid.
 475  */
 476 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 477 {
 478         struct nfsd4_open *open = &op->u.open;
 479
 480         if (!seqid_mutating_err(ntohl(op->status)))
 481                 return op->status;
 482         if (nfsd4_has_session(cstate))
 483                 return op->status;
 484         open->op_xdr_error = op->status;
 485         return nfsd4_open(rqstp, cstate, &op->u);
 486 }
 487
 488 /*
 489  * filehandle-manipulating ops.
 490  */
 491 static __be32
 492 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 493             union nfsd4_op_u *u)
 494 {
 495         u->getfh = &cstate->current_fh;
 496         return nfs_ok;
 497 }
 498
 499 static __be32
 500 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 501             union nfsd4_op_u *u)
 502 {
 503         struct nfsd4_putfh *putfh = &u->putfh;
 504
 505         fh_put(&cstate->current_fh);
 506         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 507         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 508                putfh->pf_fhlen);
 509         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 510 }
 511
 512 static __be32
 513 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 514                 union nfsd4_op_u *u)
 515 {
 516         __be32 status;
 517
 518         fh_put(&cstate->current_fh);
 519         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 520         return status;
 521 }
 522
 523 static __be32
 524 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 525                 union nfsd4_op_u *u)
 526 {
 527         if (!cstate->save_fh.fh_dentry)
 528                 return nfserr_restorefh;
 529
 530         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 531         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 532                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 533                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 534         }
 535         return nfs_ok;
 536 }
 537
 538 static __be32
 539 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 540              union nfsd4_op_u *u)
 541 {
 542         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 543         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 544                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 545                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 546         }
 547         return nfs_ok;
 548 }
 549
 550 /*
 551  * misc nfsv4 ops
 552  */
 553 static __be32
 554 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 555              union nfsd4_op_u *u)
 556 {
 557         struct nfsd4_access *access = &u->access;
 558
 559         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 560                 return nfserr_inval;
 561
 562         access->ac_resp_access = access->ac_req_access;
 563         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 564                            &access->ac_supported);
 565 }
 566
 567 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 568 {
 569         __be32 verf[2];
 570         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 571
 572         /*
 573          * This is opaque to client, so no need to byte-swap. Use
 574          * __force to keep sparse happy. y2038 time_t overflow is
 575          * irrelevant in this usage.
 576          */
 577         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 578         verf[1] = (__force __be32)nn->nfssvc_boot.tv_nsec;
 579         memcpy(verifier->data, verf, sizeof(verifier->data));
 580 }
 581
 582 static __be32
 583 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 584              union nfsd4_op_u *u)
 585 {
 586         struct nfsd4_commit *commit = &u->commit;
 587
 588         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 589         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 590                              commit->co_count);
 591 }
 592
 593 static __be32
 594 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 595              union nfsd4_op_u *u)
 596 {
 597         struct nfsd4_create *create = &u->create;
 598         struct svc_fh resfh;
 599         __be32 status;
 600         dev_t rdev;
 601
 602         fh_init(&resfh, NFS4_FHSIZE);
 603
 604         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 605         if (status)
 606                 return status;
 607
 608         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 609                                     nfsd_attrmask);
 610         if (status)
 611                 return status;
 612
 613         current->fs->umask = create->cr_umask;
 614         switch (create->cr_type) {
 615         case NF4LNK:
 616                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 617                                       create->cr_name, create->cr_namelen,
 618                                       create->cr_data, &resfh);
 619                 break;
 620
 621         case NF4BLK:
 622                 status = nfserr_inval;
 623                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 624                 if (MAJOR(rdev) != create->cr_specdata1 ||
 625                     MINOR(rdev) != create->cr_specdata2)
 626                         goto out_umask;
 627                 status = nfsd_create(rqstp, &cstate->current_fh,
 628                                      create->cr_name, create->cr_namelen,
 629                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 630                 break;
 631
 632         case NF4CHR:
 633                 status = nfserr_inval;
 634                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 635                 if (MAJOR(rdev) != create->cr_specdata1 ||
 636                     MINOR(rdev) != create->cr_specdata2)
 637                         goto out_umask;
 638                 status = nfsd_create(rqstp, &cstate->current_fh,
 639                                      create->cr_name, create->cr_namelen,
 640                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 641                 break;
 642
 643         case NF4SOCK:
 644                 status = nfsd_create(rqstp, &cstate->current_fh,
 645                                      create->cr_name, create->cr_namelen,
 646                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 647                 break;
 648
 649         case NF4FIFO:
 650                 status = nfsd_create(rqstp, &cstate->current_fh,
 651                                      create->cr_name, create->cr_namelen,
 652                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 653                 break;
 654
 655         case NF4DIR:
 656                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 657                 status = nfsd_create(rqstp, &cstate->current_fh,
 658                                      create->cr_name, create->cr_namelen,
 659                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 660                 break;
 661
 662         default:
 663                 status = nfserr_badtype;
 664         }
 665
 666         if (status)
 667                 goto out;
 668
 669         if (create->cr_label.len)
 670                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 671
 672         if (create->cr_acl != NULL)
 673                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 674                                 create->cr_bmval);
 675
 676         fh_unlock(&cstate->current_fh);
 677         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 678         fh_dup2(&cstate->current_fh, &resfh);
 679 out:
 680         fh_put(&resfh);
 681 out_umask:
 682         current->fs->umask = 0;
 683         return status;
 684 }
 685
 686 static __be32
 687 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 688               union nfsd4_op_u *u)
 689 {
 690         struct nfsd4_getattr *getattr = &u->getattr;
 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_suppattrs[cstate->minorversion][0];
 701         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 702         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 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            union nfsd4_op_u *u)
 711 {
 712         struct nfsd4_link *link = &u->link;
 713         __be32 status;
 714
 715         status = nfsd_link(rqstp, &cstate->current_fh,
 716                            link->li_name, link->li_namelen, &cstate->save_fh);
 717         if (!status)
 718                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 719         return status;
 720 }
 721
 722 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 723 {
 724         struct svc_fh tmp_fh;
 725         __be32 ret;
 726
 727         fh_init(&tmp_fh, NFS4_FHSIZE);
 728         ret = exp_pseudoroot(rqstp, &tmp_fh);
 729         if (ret)
 730                 return ret;
 731         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 732                 fh_put(&tmp_fh);
 733                 return nfserr_noent;
 734         }
 735         fh_put(&tmp_fh);
 736         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 737 }
 738
 739 static __be32
 740 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 741               union nfsd4_op_u *u)
 742 {
 743         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 744 }
 745
 746 static __be32
 747 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 748              union nfsd4_op_u *u)
 749 {
 750         return nfsd_lookup(rqstp, &cstate->current_fh,
 751                            u->lookup.lo_name, u->lookup.lo_len,
 752                            &cstate->current_fh);
 753 }
 754
 755 static __be32
 756 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 757            union nfsd4_op_u *u)
 758 {
 759         struct nfsd4_read *read = &u->read;
 760         __be32 status;
 761
 762         read->rd_filp = NULL;
 763         if (read->rd_offset >= OFFSET_MAX)
 764                 return nfserr_inval;
 765
 766         trace_nfsd_read_start(rqstp, &cstate->current_fh,
 767                               read->rd_offset, read->rd_length);
 768
 769         /*
 770          * If we do a zero copy read, then a client will see read data
 771          * that reflects the state of the file *after* performing the
 772          * following compound.
 773          *
 774          * To ensure proper ordering, we therefore turn off zero copy if
 775          * the client wants us to do more in this compound:
 776          */
 777         if (!nfsd4_last_compound_op(rqstp))
 778                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 779
 780         /* check stateid */
 781         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 782                                         &read->rd_stateid, RD_STATE,
 783                                         &read->rd_filp, &read->rd_tmp_file);
 784         if (status) {
 785                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 786                 goto out;
 787         }
 788         status = nfs_ok;
 789 out:
 790         read->rd_rqstp = rqstp;
 791         read->rd_fhp = &cstate->current_fh;
 792         return status;
 793 }
 794
 795
 796 static void
 797 nfsd4_read_release(union nfsd4_op_u *u)
 798 {
 799         if (u->read.rd_filp)
 800                 fput(u->read.rd_filp);
 801         trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
 802                              u->read.rd_offset, u->read.rd_length);
 803 }
 804
 805 static __be32
 806 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 807               union nfsd4_op_u *u)
 808 {
 809         struct nfsd4_readdir *readdir = &u->readdir;
 810         u64 cookie = readdir->rd_cookie;
 811         static const nfs4_verifier zeroverf;
 812
 813         /* no need to check permission - this will be done in nfsd_readdir() */
 814
 815         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 816                 return nfserr_inval;
 817
 818         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 819         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 820         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 821
 822         if ((cookie == 1) || (cookie == 2) ||
 823             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 824                 return nfserr_bad_cookie;
 825
 826         readdir->rd_rqstp = rqstp;
 827         readdir->rd_fhp = &cstate->current_fh;
 828         return nfs_ok;
 829 }
 830
 831 static __be32
 832 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 833                union nfsd4_op_u *u)
 834 {
 835         u->readlink.rl_rqstp = rqstp;
 836         u->readlink.rl_fhp = &cstate->current_fh;
 837         return nfs_ok;
 838 }
 839
 840 static __be32
 841 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 842              union nfsd4_op_u *u)
 843 {
 844         struct nfsd4_remove *remove = &u->remove;
 845         __be32 status;
 846
 847         if (opens_in_grace(SVC_NET(rqstp)))
 848                 return nfserr_grace;
 849         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 850                              remove->rm_name, remove->rm_namelen);
 851         if (!status) {
 852                 fh_unlock(&cstate->current_fh);
 853                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 854         }
 855         return status;
 856 }
 857
 858 static __be32
 859 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 860              union nfsd4_op_u *u)
 861 {
 862         struct nfsd4_rename *rename = &u->rename;
 863         __be32 status;
 864
 865         if (opens_in_grace(SVC_NET(rqstp)) &&
 866                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 867                 return nfserr_grace;
 868         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 869                              rename->rn_snamelen, &cstate->current_fh,
 870                              rename->rn_tname, rename->rn_tnamelen);
 871         if (status)
 872                 return status;
 873         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 874         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 875         return nfs_ok;
 876 }
 877
 878 static __be32
 879 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 880               union nfsd4_op_u *u)
 881 {
 882         struct nfsd4_secinfo *secinfo = &u->secinfo;
 883         struct svc_export *exp;
 884         struct dentry *dentry;
 885         __be32 err;
 886
 887         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 888         if (err)
 889                 return err;
 890         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 891                                     secinfo->si_name, secinfo->si_namelen,
 892                                     &exp, &dentry);
 893         if (err)
 894                 return err;
 895         fh_unlock(&cstate->current_fh);
 896         if (d_really_is_negative(dentry)) {
 897                 exp_put(exp);
 898                 err = nfserr_noent;
 899         } else
 900                 secinfo->si_exp = exp;
 901         dput(dentry);
 902         if (cstate->minorversion)
 903                 /* See rfc 5661 section 2.6.3.1.1.8 */
 904                 fh_put(&cstate->current_fh);
 905         return err;
 906 }
 907
 908 static __be32
 909 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 910                 union nfsd4_op_u *u)
 911 {
 912         __be32 err;
 913
 914         switch (u->secinfo_no_name.sin_style) {
 915         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 916                 break;
 917         case NFS4_SECINFO_STYLE4_PARENT:
 918                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 919                 if (err)
 920                         return err;
 921                 break;
 922         default:
 923                 return nfserr_inval;
 924         }
 925
 926         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 927         fh_put(&cstate->current_fh);
 928         return nfs_ok;
 929 }
 930
 931 static void
 932 nfsd4_secinfo_release(union nfsd4_op_u *u)
 933 {
 934         if (u->secinfo.si_exp)
 935                 exp_put(u->secinfo.si_exp);
 936 }
 937
 938 static void
 939 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
 940 {
 941         if (u->secinfo_no_name.sin_exp)
 942                 exp_put(u->secinfo_no_name.sin_exp);
 943 }
 944
 945 static __be32
 946 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 947               union nfsd4_op_u *u)
 948 {
 949         struct nfsd4_setattr *setattr = &u->setattr;
 950         __be32 status = nfs_ok;
 951         int err;
 952
 953         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 954                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 955                                 &cstate->current_fh, &setattr->sa_stateid,
 956                                 WR_STATE, NULL, NULL);
 957                 if (status) {
 958                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 959                         return status;
 960                 }
 961         }
 962         err = fh_want_write(&cstate->current_fh);
 963         if (err)
 964                 return nfserrno(err);
 965         status = nfs_ok;
 966
 967         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 968                                     nfsd_attrmask);
 969         if (status)
 970                 goto out;
 971
 972         if (setattr->sa_acl != NULL)
 973                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 974                                             setattr->sa_acl);
 975         if (status)
 976                 goto out;
 977         if (setattr->sa_label.len)
 978                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 979                                 &setattr->sa_label);
 980         if (status)
 981                 goto out;
 982         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 983                                 0, (time_t)0);
 984 out:
 985         fh_drop_write(&cstate->current_fh);
 986         return status;
 987 }
 988
 989 static __be32
 990 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 991             union nfsd4_op_u *u)
 992 {
 993         struct nfsd4_write *write = &u->write;
 994         stateid_t *stateid = &write->wr_stateid;
 995         struct file *filp = NULL;
 996         __be32 status = nfs_ok;
 997         unsigned long cnt;
 998         int nvecs;
 999
1000         if (write->wr_offset >= OFFSET_MAX)
1001                 return nfserr_inval;
1002
1003         cnt = write->wr_buflen;
1004         trace_nfsd_write_start(rqstp, &cstate->current_fh,
1005                                write->wr_offset, cnt);
1006         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1007                                                 stateid, WR_STATE, &filp, NULL);
1008         if (status) {
1009                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1010                 return status;
1011         }
1012
1013         write->wr_how_written = write->wr_stable_how;
1014         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1015
1016         nvecs = svc_fill_write_vector(rqstp, write->wr_pagelist,
1017                                       &write->wr_head, write->wr_buflen);
1018         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1019
1020         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1021                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1022                                 write->wr_how_written);
1023         fput(filp);
1024
1025         write->wr_bytes_written = cnt;
1026         trace_nfsd_write_done(rqstp, &cstate->current_fh,
1027                               write->wr_offset, cnt);
1028         return status;
1029 }
1030
1031 static __be32
1032 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1033                   stateid_t *src_stateid, struct file **src,
1034                   stateid_t *dst_stateid, struct file **dst)
1035 {
1036         __be32 status;
1037
1038         if (!cstate->save_fh.fh_dentry)
1039                 return nfserr_nofilehandle;
1040
1041         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1042                                             src_stateid, RD_STATE, src, NULL);
1043         if (status) {
1044                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1045                 goto out;
1046         }
1047
1048         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1049                                             dst_stateid, WR_STATE, dst, NULL);
1050         if (status) {
1051                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1052                 goto out_put_src;
1053         }
1054
1055         /* fix up for NFS-specific error code */
1056         if (!S_ISREG(file_inode(*src)->i_mode) ||
1057             !S_ISREG(file_inode(*dst)->i_mode)) {
1058                 status = nfserr_wrong_type;
1059                 goto out_put_dst;
1060         }
1061
1062 out:
1063         return status;
1064 out_put_dst:
1065         fput(*dst);
1066 out_put_src:
1067         fput(*src);
1068         goto out;
1069 }
1070
1071 static __be32
1072 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1073                 union nfsd4_op_u *u)
1074 {
1075         struct nfsd4_clone *clone = &u->clone;
1076         struct file *src, *dst;
1077         __be32 status;
1078
1079         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1080                                    &clone->cl_dst_stateid, &dst);
1081         if (status)
1082                 goto out;
1083
1084         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1085                         dst, clone->cl_dst_pos, clone->cl_count);
1086
1087         fput(dst);
1088         fput(src);
1089 out:
1090         return status;
1091 }
1092
1093 static __be32
1094 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1095                 union nfsd4_op_u *u)
1096 {
1097         struct nfsd4_copy *copy = &u->copy;
1098         struct file *src, *dst;
1099         __be32 status;
1100         ssize_t bytes;
1101
1102         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1103                                    &copy->cp_dst_stateid, &dst);
1104         if (status)
1105                 goto out;
1106
1107         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1108                         dst, copy->cp_dst_pos, copy->cp_count);
1109
1110         if (bytes < 0)
1111                 status = nfserrno(bytes);
1112         else {
1113                 copy->cp_res.wr_bytes_written = bytes;
1114                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1115                 copy->cp_synchronous = 1;
1116                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1117                 status = nfs_ok;
1118         }
1119
1120         fput(src);
1121         fput(dst);
1122 out:
1123         return status;
1124 }
1125
1126 static __be32
1127 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1128                 struct nfsd4_fallocate *fallocate, int flags)
1129 {
1130         __be32 status = nfserr_notsupp;
1131         struct file *file;
1132
1133         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1134                                             &fallocate->falloc_stateid,
1135                                             WR_STATE, &file, NULL);
1136         if (status != nfs_ok) {
1137                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1138                 return status;
1139         }
1140
1141         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1142                                      fallocate->falloc_offset,
1143                                      fallocate->falloc_length,
1144                                      flags);
1145         fput(file);
1146         return status;
1147 }
1148
1149 static __be32
1150 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1151                union nfsd4_op_u *u)
1152 {
1153         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1154 }
1155
1156 static __be32
1157 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1158                  union nfsd4_op_u *u)
1159 {
1160         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1161                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1162 }
1163
1164 static __be32
1165 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1166            union nfsd4_op_u *u)
1167 {
1168         struct nfsd4_seek *seek = &u->seek;
1169         int whence;
1170         __be32 status;
1171         struct file *file;
1172
1173         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1174                                             &seek->seek_stateid,
1175                                             RD_STATE, &file, NULL);
1176         if (status) {
1177                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1178                 return status;
1179         }
1180
1181         switch (seek->seek_whence) {
1182         case NFS4_CONTENT_DATA:
1183                 whence = SEEK_DATA;
1184                 break;
1185         case NFS4_CONTENT_HOLE:
1186                 whence = SEEK_HOLE;
1187                 break;
1188         default:
1189                 status = nfserr_union_notsupp;
1190                 goto out;
1191         }
1192
1193         /*
1194          * Note:  This call does change file->f_pos, but nothing in NFSD
1195          *        should ever file->f_pos.
1196          */
1197         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1198         if (seek->seek_pos < 0)
1199                 status = nfserrno(seek->seek_pos);
1200         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1201                 seek->seek_eof = true;
1202
1203 out:
1204         fput(file);
1205         return status;
1206 }
1207
1208 /* This routine never returns NFS_OK!  If there are no other errors, it
1209  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1210  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1211  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1212  */
1213 static __be32
1214 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1215              struct nfsd4_verify *verify)
1216 {
1217         __be32 *buf, *p;
1218         int count;
1219         __be32 status;
1220
1221         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1222         if (status)
1223                 return status;
1224
1225         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1226         if (status)
1227                 return status;
1228
1229         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1230             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1231                 return nfserr_inval;
1232         if (verify->ve_attrlen & 3)
1233                 return nfserr_inval;
1234
1235         /* count in words:
1236          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1237          */
1238         count = 4 + (verify->ve_attrlen >> 2);
1239         buf = kmalloc(count << 2, GFP_KERNEL);
1240         if (!buf)
1241                 return nfserr_jukebox;
1242
1243         p = buf;
1244         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1245                                     cstate->current_fh.fh_export,
1246                                     cstate->current_fh.fh_dentry,
1247                                     verify->ve_bmval,
1248                                     rqstp, 0);
1249         /*
1250          * If nfsd4_encode_fattr() ran out of space, assume that's because
1251          * the attributes are longer (hence different) than those given:
1252          */
1253         if (status == nfserr_resource)
1254                 status = nfserr_not_same;
1255         if (status)
1256                 goto out_kfree;
1257
1258         /* skip bitmap */
1259         p = buf + 1 + ntohl(buf[0]);
1260         status = nfserr_not_same;
1261         if (ntohl(*p++) != verify->ve_attrlen)
1262                 goto out_kfree;
1263         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1264                 status = nfserr_same;
1265
1266 out_kfree:
1267         kfree(buf);
1268         return status;
1269 }
1270
1271 static __be32
1272 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1273               union nfsd4_op_u *u)
1274 {
1275         __be32 status;
1276
1277         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1278         return status == nfserr_not_same ? nfs_ok : status;
1279 }
1280
1281 static __be32
1282 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1283              union nfsd4_op_u *u)
1284 {
1285         __be32 status;
1286
1287         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1288         return status == nfserr_same ? nfs_ok : status;
1289 }
1290
1291 #ifdef CONFIG_NFSD_PNFS
1292 static const struct nfsd4_layout_ops *
1293 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1294 {
1295         if (!exp->ex_layout_types) {
1296                 dprintk("%s: export does not support pNFS\n", __func__);
1297                 return NULL;
1298         }
1299
1300         if (layout_type >= LAYOUT_TYPE_MAX ||
1301             !(exp->ex_layout_types & (1 << layout_type))) {
1302                 dprintk("%s: layout type %d not supported\n",
1303                         __func__, layout_type);
1304                 return NULL;
1305         }
1306
1307         return nfsd4_layout_ops[layout_type];
1308 }
1309
1310 static __be32
1311 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1312                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1313 {
1314         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1315         const struct nfsd4_layout_ops *ops;
1316         struct nfsd4_deviceid_map *map;
1317         struct svc_export *exp;
1318         __be32 nfserr;
1319
1320         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1321                __func__,
1322                gdp->gd_layout_type,
1323                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1324                gdp->gd_maxcount);
1325
1326         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1327         if (!map) {
1328                 dprintk("%s: couldn't find device ID to export mapping!\n",
1329                         __func__);
1330                 return nfserr_noent;
1331         }
1332
1333         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1334         if (IS_ERR(exp)) {
1335                 dprintk("%s: could not find device id\n", __func__);
1336                 return nfserr_noent;
1337         }
1338
1339         nfserr = nfserr_layoutunavailable;
1340         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1341         if (!ops)
1342                 goto out;
1343
1344         nfserr = nfs_ok;
1345         if (gdp->gd_maxcount != 0) {
1346                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1347                                 rqstp, cstate->session->se_client, gdp);
1348         }
1349
1350         gdp->gd_notify_types &= ops->notify_types;
1351 out:
1352         exp_put(exp);
1353         return nfserr;
1354 }
1355
1356 static void
1357 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1358 {
1359         kfree(u->getdeviceinfo.gd_device);
1360 }
1361
1362 static __be32
1363 nfsd4_layoutget(struct svc_rqst *rqstp,
1364                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1365 {
1366         struct nfsd4_layoutget *lgp = &u->layoutget;
1367         struct svc_fh *current_fh = &cstate->current_fh;
1368         const struct nfsd4_layout_ops *ops;
1369         struct nfs4_layout_stateid *ls;
1370         __be32 nfserr;
1371         int accmode = NFSD_MAY_READ_IF_EXEC;
1372
1373         switch (lgp->lg_seg.iomode) {
1374         case IOMODE_READ:
1375                 accmode |= NFSD_MAY_READ;
1376                 break;
1377         case IOMODE_RW:
1378                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
1379                 break;
1380         default:
1381                 dprintk("%s: invalid iomode %d\n",
1382                         __func__, lgp->lg_seg.iomode);
1383                 nfserr = nfserr_badiomode;
1384                 goto out;
1385         }
1386
1387         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1388         if (nfserr)
1389                 goto out;
1390
1391         nfserr = nfserr_layoutunavailable;
1392         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1393         if (!ops)
1394                 goto out;
1395
1396         /*
1397          * Verify minlength and range as per RFC5661:
1398          *  o  If loga_length is less than loga_minlength,
1399          *     the metadata server MUST return NFS4ERR_INVAL.
1400          *  o  If the sum of loga_offset and loga_minlength exceeds
1401          *     NFS4_UINT64_MAX, and loga_minlength is not
1402          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1403          *  o  If the sum of loga_offset and loga_length exceeds
1404          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1405          *     the error NFS4ERR_INVAL MUST result.
1406          */
1407         nfserr = nfserr_inval;
1408         if (lgp->lg_seg.length < lgp->lg_minlength ||
1409             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1410              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1411             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1412              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1413                 goto out;
1414         if (lgp->lg_seg.length == 0)
1415                 goto out;
1416
1417         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1418                                                 true, lgp->lg_layout_type, &ls);
1419         if (nfserr) {
1420                 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
1421                 goto out;
1422         }
1423
1424         nfserr = nfserr_recallconflict;
1425         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1426                 goto out_put_stid;
1427
1428         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1429                                      current_fh, lgp);
1430         if (nfserr)
1431                 goto out_put_stid;
1432
1433         nfserr = nfsd4_insert_layout(lgp, ls);
1434
1435 out_put_stid:
1436         mutex_unlock(&ls->ls_mutex);
1437         nfs4_put_stid(&ls->ls_stid);
1438 out:
1439         return nfserr;
1440 }
1441
1442 static void
1443 nfsd4_layoutget_release(union nfsd4_op_u *u)
1444 {
1445         kfree(u->layoutget.lg_content);
1446 }
1447
1448 static __be32
1449 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1450                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1451 {
1452         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1453         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1454         struct svc_fh *current_fh = &cstate->current_fh;
1455         const struct nfsd4_layout_ops *ops;
1456         loff_t new_size = lcp->lc_last_wr + 1;
1457         struct inode *inode;
1458         struct nfs4_layout_stateid *ls;
1459         __be32 nfserr;
1460
1461         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1462         if (nfserr)
1463                 goto out;
1464
1465         nfserr = nfserr_layoutunavailable;
1466         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1467         if (!ops)
1468                 goto out;
1469         inode = d_inode(current_fh->fh_dentry);
1470
1471         nfserr = nfserr_inval;
1472         if (new_size <= seg->offset) {
1473                 dprintk("pnfsd: last write before layout segment\n");
1474                 goto out;
1475         }
1476         if (new_size > seg->offset + seg->length) {
1477                 dprintk("pnfsd: last write beyond layout segment\n");
1478                 goto out;
1479         }
1480         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1481                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1482                 goto out;
1483         }
1484
1485         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1486                                                 false, lcp->lc_layout_type,
1487                                                 &ls);
1488         if (nfserr) {
1489                 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
1490                 /* fixup error code as per RFC5661 */
1491                 if (nfserr == nfserr_bad_stateid)
1492                         nfserr = nfserr_badlayout;
1493                 goto out;
1494         }
1495
1496         /* LAYOUTCOMMIT does not require any serialization */
1497         mutex_unlock(&ls->ls_mutex);
1498
1499         if (new_size > i_size_read(inode)) {
1500                 lcp->lc_size_chg = 1;
1501                 lcp->lc_newsize = new_size;
1502         } else {
1503                 lcp->lc_size_chg = 0;
1504         }
1505
1506         nfserr = ops->proc_layoutcommit(inode, lcp);
1507         nfs4_put_stid(&ls->ls_stid);
1508 out:
1509         return nfserr;
1510 }
1511
1512 static __be32
1513 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1514                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1515 {
1516         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1517         struct svc_fh *current_fh = &cstate->current_fh;
1518         __be32 nfserr;
1519
1520         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1521         if (nfserr)
1522                 goto out;
1523
1524         nfserr = nfserr_layoutunavailable;
1525         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1526                 goto out;
1527
1528         switch (lrp->lr_seg.iomode) {
1529         case IOMODE_READ:
1530         case IOMODE_RW:
1531         case IOMODE_ANY:
1532                 break;
1533         default:
1534                 dprintk("%s: invalid iomode %d\n", __func__,
1535                         lrp->lr_seg.iomode);
1536                 nfserr = nfserr_inval;
1537                 goto out;
1538         }
1539
1540         switch (lrp->lr_return_type) {
1541         case RETURN_FILE:
1542                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1543                 break;
1544         case RETURN_FSID:
1545         case RETURN_ALL:
1546                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1547                 break;
1548         default:
1549                 dprintk("%s: invalid return_type %d\n", __func__,
1550                         lrp->lr_return_type);
1551                 nfserr = nfserr_inval;
1552                 break;
1553         }
1554 out:
1555         return nfserr;
1556 }
1557 #endif /* CONFIG_NFSD_PNFS */
1558
1559 /*
1560  * NULL call.
1561  */
1562 static __be32
1563 nfsd4_proc_null(struct svc_rqst *rqstp)
1564 {
1565         return nfs_ok;
1566 }
1567
1568 static inline void nfsd4_increment_op_stats(u32 opnum)
1569 {
1570         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1571                 nfsdstats.nfs4_opcount[opnum]++;
1572 }
1573
1574 static const struct nfsd4_operation nfsd4_ops[];
1575
1576 static const char *nfsd4_op_name(unsigned opnum);
1577
1578 /*
1579  * Enforce NFSv4.1 COMPOUND ordering rules:
1580  *
1581  * Also note, enforced elsewhere:
1582  *      - SEQUENCE other than as first op results in
1583  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1584  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1585  *        (Enforced in nfsd4_bind_conn_to_session().)
1586  *      - DESTROY_SESSION must be the final operation in a compound, if
1587  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1588  *        (Enforced in nfsd4_destroy_session().)
1589  */
1590 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1591 {
1592         struct nfsd4_op *first_op = &args->ops[0];
1593
1594         /* These ordering requirements don't apply to NFSv4.0: */
1595         if (args->minorversion == 0)
1596                 return nfs_ok;
1597         /* This is weird, but OK, not our problem: */
1598         if (args->opcnt == 0)
1599                 return nfs_ok;
1600         if (first_op->status == nfserr_op_illegal)
1601                 return nfs_ok;
1602         if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1603                 return nfserr_op_not_in_session;
1604         if (first_op->opnum == OP_SEQUENCE)
1605                 return nfs_ok;
1606         /*
1607          * So first_op is something allowed outside a session, like
1608          * EXCHANGE_ID; but then it has to be the only op in the
1609          * compound:
1610          */
1611         if (args->opcnt != 1)
1612                 return nfserr_not_only_op;
1613         return nfs_ok;
1614 }
1615
1616 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1617 {
1618         return &nfsd4_ops[op->opnum];
1619 }
1620
1621 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1622 {
1623         if (op->opnum == OP_ILLEGAL)
1624                 return false;
1625         return OPDESC(op)->op_flags & OP_CACHEME;
1626 }
1627
1628 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1629 {
1630         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1631         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1632         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1633         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1634         const struct nfsd4_operation *thisd = OPDESC(this);
1635         const struct nfsd4_operation *nextd;
1636
1637         /*
1638          * Most ops check wronsec on our own; only the putfh-like ops
1639          * have special rules.
1640          */
1641         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1642                 return false;
1643         /*
1644          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1645          * put-filehandle operation if we're not going to use the
1646          * result:
1647          */
1648         if (argp->opcnt == resp->opcnt)
1649                 return false;
1650         if (next->opnum == OP_ILLEGAL)
1651                 return false;
1652         nextd = OPDESC(next);
1653         /*
1654          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1655          * errors themselves as necessary; others should check for them
1656          * now:
1657          */
1658         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1659 }
1660
1661 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1662                                struct nfsd4_compoundres *resp)
1663 {
1664         struct xdr_stream *xdr = &resp->xdr;
1665         struct xdr_buf *buf = &rqstp->rq_res;
1666         struct kvec *head = buf->head;
1667
1668         xdr->buf = buf;
1669         xdr->iov = head;
1670         xdr->p   = head->iov_base + head->iov_len;
1671         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1672         /* Tail and page_len should be zero at this point: */
1673         buf->len = buf->head[0].iov_len;
1674         xdr->scratch.iov_len = 0;
1675         xdr->page_ptr = buf->pages - 1;
1676         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1677                 - rqstp->rq_auth_slack;
1678 }
1679
1680 /*
1681  * COMPOUND call.
1682  */
1683 static __be32
1684 nfsd4_proc_compound(struct svc_rqst *rqstp)
1685 {
1686         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1687         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1688         struct nfsd4_op *op;
1689         struct nfsd4_compound_state *cstate = &resp->cstate;
1690         struct svc_fh *current_fh = &cstate->current_fh;
1691         struct svc_fh *save_fh = &cstate->save_fh;
1692         __be32          status;
1693
1694         svcxdr_init_encode(rqstp, resp);
1695         resp->tagp = resp->xdr.p;
1696         /* reserve space for: taglen, tag, and opcnt */
1697         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1698         resp->taglen = args->taglen;
1699         resp->tag = args->tag;
1700         resp->rqstp = rqstp;
1701         cstate->minorversion = args->minorversion;
1702         fh_init(current_fh, NFS4_FHSIZE);
1703         fh_init(save_fh, NFS4_FHSIZE);
1704         /*
1705          * Don't use the deferral mechanism for NFSv4; compounds make it
1706          * too hard to avoid non-idempotency problems.
1707          */
1708         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1709
1710         /*
1711          * According to RFC3010, this takes precedence over all other errors.
1712          */
1713         status = nfserr_minor_vers_mismatch;
1714         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1715                 goto out;
1716         status = nfserr_resource;
1717         if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1718                 goto out;
1719
1720         status = nfs41_check_op_ordering(args);
1721         if (status) {
1722                 op = &args->ops[0];
1723                 op->status = status;
1724                 resp->opcnt = 1;
1725                 goto encode_op;
1726         }
1727
1728         trace_nfsd_compound(rqstp, args->opcnt);
1729         while (!status && resp->opcnt < args->opcnt) {
1730                 op = &args->ops[resp->opcnt++];
1731
1732                 /*
1733                  * The XDR decode routines may have pre-set op->status;
1734                  * for example, if there is a miscellaneous XDR error
1735                  * it will be set to nfserr_bad_xdr.
1736                  */
1737                 if (op->status) {
1738                         if (op->opnum == OP_OPEN)
1739                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1740                         goto encode_op;
1741                 }
1742
1743                 if (!current_fh->fh_dentry) {
1744                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1745                                 op->status = nfserr_nofilehandle;
1746                                 goto encode_op;
1747                         }
1748                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1749                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1750                         op->status = nfserr_moved;
1751                         goto encode_op;
1752                 }
1753
1754                 fh_clear_wcc(current_fh);
1755
1756                 /* If op is non-idempotent */
1757                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1758                         /*
1759                          * Don't execute this op if we couldn't encode a
1760                          * succesful reply:
1761                          */
1762                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
1763                         /*
1764                          * Plus if there's another operation, make sure
1765                          * we'll have space to at least encode an error:
1766                          */
1767                         if (resp->opcnt < args->opcnt)
1768                                 plen += COMPOUND_ERR_SLACK_SPACE;
1769                         op->status = nfsd4_check_resp_size(resp, plen);
1770                 }
1771
1772                 if (op->status)
1773                         goto encode_op;
1774
1775                 if (op->opdesc->op_get_currentstateid)
1776                         op->opdesc->op_get_currentstateid(cstate, &op->u);
1777                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
1778
1779                 /* Only from SEQUENCE */
1780                 if (cstate->status == nfserr_replay_cache) {
1781                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1782                         status = op->status;
1783                         goto out;
1784                 }
1785                 if (!op->status) {
1786                         if (op->opdesc->op_set_currentstateid)
1787                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
1788
1789                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
1790                                 clear_current_stateid(cstate);
1791
1792                         if (need_wrongsec_check(rqstp))
1793                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1794                 }
1795 encode_op:
1796                 if (op->status == nfserr_replay_me) {
1797                         op->replay = &cstate->replay_owner->so_replay;
1798                         nfsd4_encode_replay(&resp->xdr, op);
1799                         status = op->status = op->replay->rp_status;
1800                 } else {
1801                         nfsd4_encode_operation(resp, op);
1802                         status = op->status;
1803                 }
1804
1805                 trace_nfsd_compound_status(args->opcnt, resp->opcnt, status,
1806                                            nfsd4_op_name(op->opnum));
1807
1808                 nfsd4_cstate_clear_replay(cstate);
1809                 nfsd4_increment_op_stats(op->opnum);
1810         }
1811
1812         cstate->status = status;
1813         fh_put(current_fh);
1814         fh_put(save_fh);
1815         BUG_ON(cstate->replay_owner);
1816 out:
1817         /* Reset deferral mechanism for RPC deferrals */
1818         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1819         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1820         return status;
1821 }
1822
1823 #define op_encode_hdr_size              (2)
1824 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1825 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1826 #define op_encode_change_info_maxsz     (5)
1827 #define nfs4_fattr_bitmap_maxsz         (4)
1828
1829 /* We'll fall back on returning no lockowner if run out of space: */
1830 #define op_encode_lockowner_maxsz       (0)
1831 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1832
1833 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1834
1835 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1836 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1837                                          op_encode_ace_maxsz)
1838
1839 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1840
1841 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1842 {
1843         return (op_encode_hdr_size) * sizeof(__be32);
1844 }
1845
1846 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1847 {
1848         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1849 }
1850
1851 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1852 {
1853         /* ac_supported, ac_resp_access */
1854         return (op_encode_hdr_size + 2)* sizeof(__be32);
1855 }
1856
1857 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1858 {
1859         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1860 }
1861
1862 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1863 {
1864         return (op_encode_hdr_size + op_encode_change_info_maxsz
1865                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1866 }
1867
1868 /*
1869  * Note since this is an idempotent operation we won't insist on failing
1870  * the op prematurely if the estimate is too large.  We may turn off splice
1871  * reads unnecessarily.
1872  */
1873 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1874                                       struct nfsd4_op *op)
1875 {
1876         u32 *bmap = op->u.getattr.ga_bmval;
1877         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1878         u32 ret = 0;
1879
1880         if (bmap0 & FATTR4_WORD0_ACL)
1881                 return svc_max_payload(rqstp);
1882         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1883                 return svc_max_payload(rqstp);
1884
1885         if (bmap1 & FATTR4_WORD1_OWNER) {
1886                 ret += IDMAP_NAMESZ + 4;
1887                 bmap1 &= ~FATTR4_WORD1_OWNER;
1888         }
1889         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1890                 ret += IDMAP_NAMESZ + 4;
1891                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1892         }
1893         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1894                 ret += NFS4_FHSIZE + 4;
1895                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1896         }
1897         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1898                 ret += NFS4_MAXLABELLEN + 12;
1899                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1900         }
1901         /*
1902          * Largest of remaining attributes are 16 bytes (e.g.,
1903          * supported_attributes)
1904          */
1905         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1906         /* bitmask, length */
1907         ret += 20;
1908         return ret;
1909 }
1910
1911 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1912 {
1913         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1914 }
1915
1916 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1917 {
1918         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1919                 * sizeof(__be32);
1920 }
1921
1922 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1923 {
1924         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1925                 * sizeof(__be32);
1926 }
1927
1928 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1929 {
1930         return (op_encode_hdr_size + op_encode_stateid_maxsz
1931                 + op_encode_change_info_maxsz + 1
1932                 + nfs4_fattr_bitmap_maxsz
1933                 + op_encode_delegation_maxsz) * sizeof(__be32);
1934 }
1935
1936 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1937 {
1938         u32 maxcount = 0, rlen = 0;
1939
1940         maxcount = svc_max_payload(rqstp);
1941         rlen = min(op->u.read.rd_length, maxcount);
1942
1943         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1944 }
1945
1946 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1947 {
1948         u32 maxcount = 0, rlen = 0;
1949
1950         maxcount = svc_max_payload(rqstp);
1951         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1952
1953         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1954                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1955 }
1956
1957 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1958 {
1959         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1960 }
1961
1962 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1963 {
1964         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1965                 * sizeof(__be32);
1966 }
1967
1968 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1969 {
1970         return (op_encode_hdr_size + op_encode_change_info_maxsz
1971                 + op_encode_change_info_maxsz) * sizeof(__be32);
1972 }
1973
1974 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1975                                        struct nfsd4_op *op)
1976 {
1977         return (op_encode_hdr_size
1978                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1979 }
1980
1981 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1982 {
1983         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1984                 * sizeof(__be32);
1985 }
1986
1987 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1988 {
1989         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1990 }
1991
1992 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1993 {
1994         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
1995                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
1996 }
1997
1998 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1999 {
2000         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2001                                                                 sizeof(__be32);
2002 }
2003
2004 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2005 {
2006         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2007 }
2008
2009 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2010 {
2011         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2012                 1 + 1 + /* eir_flags, spr_how */\
2013                 4 + /* spo_must_enforce & _allow with bitmap */\
2014                 2 + /*eir_server_owner.so_minor_id */\
2015                 /* eir_server_owner.so_major_id<> */\
2016                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2017                 /* eir_server_scope<> */\
2018                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2019                 1 + /* eir_server_impl_id array length */\
2020                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2021 }
2022
2023 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2024 {
2025         return (op_encode_hdr_size + \
2026                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2027                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2028 }
2029
2030 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2031 {
2032         return (op_encode_hdr_size + \
2033                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2034                 2 + /* csr_sequence, csr_flags */\
2035                 op_encode_channel_attrs_maxsz + \
2036                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2037 }
2038
2039 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2040 {
2041         return (op_encode_hdr_size +
2042                 1 /* wr_callback */ +
2043                 op_encode_stateid_maxsz /* wr_callback */ +
2044                 2 /* wr_count */ +
2045                 1 /* wr_committed */ +
2046                 op_encode_verifier_maxsz +
2047                 1 /* cr_consecutive */ +
2048                 1 /* cr_synchronous */) * sizeof(__be32);
2049 }
2050
2051 #ifdef CONFIG_NFSD_PNFS
2052 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2053 {
2054         u32 maxcount = 0, rlen = 0;
2055
2056         maxcount = svc_max_payload(rqstp);
2057         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2058
2059         return (op_encode_hdr_size +
2060                 1 /* gd_layout_type*/ +
2061                 XDR_QUADLEN(rlen) +
2062                 2 /* gd_notify_types */) * sizeof(__be32);
2063 }
2064
2065 /*
2066  * At this stage we don't really know what layout driver will handle the request,
2067  * so we need to define an arbitrary upper bound here.
2068  */
2069 #define MAX_LAYOUT_SIZE         128
2070 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2071 {
2072         return (op_encode_hdr_size +
2073                 1 /* logr_return_on_close */ +
2074                 op_encode_stateid_maxsz +
2075                 1 /* nr of layouts */ +
2076                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2077 }
2078
2079 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2080 {
2081         return (op_encode_hdr_size +
2082                 1 /* locr_newsize */ +
2083                 2 /* ns_size */) * sizeof(__be32);
2084 }
2085
2086 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2087 {
2088         return (op_encode_hdr_size +
2089                 1 /* lrs_stateid */ +
2090                 op_encode_stateid_maxsz) * sizeof(__be32);
2091 }
2092 #endif /* CONFIG_NFSD_PNFS */
2093
2094
2095 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2096 {
2097         return (op_encode_hdr_size + 3) * sizeof(__be32);
2098 }
2099
2100 static const struct nfsd4_operation nfsd4_ops[] = {
2101         [OP_ACCESS] = {
2102                 .op_func = nfsd4_access,
2103                 .op_name = "OP_ACCESS",
2104                 .op_rsize_bop = nfsd4_access_rsize,
2105         },
2106         [OP_CLOSE] = {
2107                 .op_func = nfsd4_close,
2108                 .op_flags = OP_MODIFIES_SOMETHING,
2109                 .op_name = "OP_CLOSE",
2110                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2111                 .op_get_currentstateid = nfsd4_get_closestateid,
2112                 .op_set_currentstateid = nfsd4_set_closestateid,
2113         },
2114         [OP_COMMIT] = {
2115                 .op_func = nfsd4_commit,
2116                 .op_flags = OP_MODIFIES_SOMETHING,
2117                 .op_name = "OP_COMMIT",
2118                 .op_rsize_bop = nfsd4_commit_rsize,
2119         },
2120         [OP_CREATE] = {
2121                 .op_func = nfsd4_create,
2122                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2123                 .op_name = "OP_CREATE",
2124                 .op_rsize_bop = nfsd4_create_rsize,
2125         },
2126         [OP_DELEGRETURN] = {
2127                 .op_func = nfsd4_delegreturn,
2128                 .op_flags = OP_MODIFIES_SOMETHING,
2129                 .op_name = "OP_DELEGRETURN",
2130                 .op_rsize_bop = nfsd4_only_status_rsize,
2131                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2132         },
2133         [OP_GETATTR] = {
2134                 .op_func = nfsd4_getattr,
2135                 .op_flags = ALLOWED_ON_ABSENT_FS,
2136                 .op_rsize_bop = nfsd4_getattr_rsize,
2137                 .op_name = "OP_GETATTR",
2138         },
2139         [OP_GETFH] = {
2140                 .op_func = nfsd4_getfh,
2141                 .op_name = "OP_GETFH",
2142                 .op_rsize_bop = nfsd4_getfh_rsize,
2143         },
2144         [OP_LINK] = {
2145                 .op_func = nfsd4_link,
2146                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2147                                 | OP_CACHEME,
2148                 .op_name = "OP_LINK",
2149                 .op_rsize_bop = nfsd4_link_rsize,
2150         },
2151         [OP_LOCK] = {
2152                 .op_func = nfsd4_lock,
2153                 .op_flags = OP_MODIFIES_SOMETHING |
2154                                 OP_NONTRIVIAL_ERROR_ENCODE,
2155                 .op_name = "OP_LOCK",
2156                 .op_rsize_bop = nfsd4_lock_rsize,
2157                 .op_set_currentstateid = nfsd4_set_lockstateid,
2158         },
2159         [OP_LOCKT] = {
2160                 .op_func = nfsd4_lockt,
2161                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2162                 .op_name = "OP_LOCKT",
2163                 .op_rsize_bop = nfsd4_lock_rsize,
2164         },
2165         [OP_LOCKU] = {
2166                 .op_func = nfsd4_locku,
2167                 .op_flags = OP_MODIFIES_SOMETHING,
2168                 .op_name = "OP_LOCKU",
2169                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2170                 .op_get_currentstateid = nfsd4_get_lockustateid,
2171         },
2172         [OP_LOOKUP] = {
2173                 .op_func = nfsd4_lookup,
2174                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2175                 .op_name = "OP_LOOKUP",
2176                 .op_rsize_bop = nfsd4_only_status_rsize,
2177         },
2178         [OP_LOOKUPP] = {
2179                 .op_func = nfsd4_lookupp,
2180                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2181                 .op_name = "OP_LOOKUPP",
2182                 .op_rsize_bop = nfsd4_only_status_rsize,
2183         },
2184         [OP_NVERIFY] = {
2185                 .op_func = nfsd4_nverify,
2186                 .op_name = "OP_NVERIFY",
2187                 .op_rsize_bop = nfsd4_only_status_rsize,
2188         },
2189         [OP_OPEN] = {
2190                 .op_func = nfsd4_open,
2191                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2192                 .op_name = "OP_OPEN",
2193                 .op_rsize_bop = nfsd4_open_rsize,
2194                 .op_set_currentstateid = nfsd4_set_openstateid,
2195         },
2196         [OP_OPEN_CONFIRM] = {
2197                 .op_func = nfsd4_open_confirm,
2198                 .op_flags = OP_MODIFIES_SOMETHING,
2199                 .op_name = "OP_OPEN_CONFIRM",
2200                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2201         },
2202         [OP_OPEN_DOWNGRADE] = {
2203                 .op_func = nfsd4_open_downgrade,
2204                 .op_flags = OP_MODIFIES_SOMETHING,
2205                 .op_name = "OP_OPEN_DOWNGRADE",
2206                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2207                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2208                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2209         },
2210         [OP_PUTFH] = {
2211                 .op_func = nfsd4_putfh,
2212                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2213                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2214                 .op_name = "OP_PUTFH",
2215                 .op_rsize_bop = nfsd4_only_status_rsize,
2216         },
2217         [OP_PUTPUBFH] = {
2218                 .op_func = nfsd4_putrootfh,
2219                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2220                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2221                 .op_name = "OP_PUTPUBFH",
2222                 .op_rsize_bop = nfsd4_only_status_rsize,
2223         },
2224         [OP_PUTROOTFH] = {
2225                 .op_func = nfsd4_putrootfh,
2226                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2227                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2228                 .op_name = "OP_PUTROOTFH",
2229                 .op_rsize_bop = nfsd4_only_status_rsize,
2230         },
2231         [OP_READ] = {
2232                 .op_func = nfsd4_read,
2233                 .op_release = nfsd4_read_release,
2234                 .op_name = "OP_READ",
2235                 .op_rsize_bop = nfsd4_read_rsize,
2236                 .op_get_currentstateid = nfsd4_get_readstateid,
2237         },
2238         [OP_READDIR] = {
2239                 .op_func = nfsd4_readdir,
2240                 .op_name = "OP_READDIR",
2241                 .op_rsize_bop = nfsd4_readdir_rsize,
2242         },
2243         [OP_READLINK] = {
2244                 .op_func = nfsd4_readlink,
2245                 .op_name = "OP_READLINK",
2246                 .op_rsize_bop = nfsd4_readlink_rsize,
2247         },
2248         [OP_REMOVE] = {
2249                 .op_func = nfsd4_remove,
2250                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2251                 .op_name = "OP_REMOVE",
2252                 .op_rsize_bop = nfsd4_remove_rsize,
2253         },
2254         [OP_RENAME] = {
2255                 .op_func = nfsd4_rename,
2256                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2257                 .op_name = "OP_RENAME",
2258                 .op_rsize_bop = nfsd4_rename_rsize,
2259         },
2260         [OP_RENEW] = {
2261                 .op_func = nfsd4_renew,
2262                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2263                                 | OP_MODIFIES_SOMETHING,
2264                 .op_name = "OP_RENEW",
2265                 .op_rsize_bop = nfsd4_only_status_rsize,
2266
2267         },
2268         [OP_RESTOREFH] = {
2269                 .op_func = nfsd4_restorefh,
2270                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2271                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2272                 .op_name = "OP_RESTOREFH",
2273                 .op_rsize_bop = nfsd4_only_status_rsize,
2274         },
2275         [OP_SAVEFH] = {
2276                 .op_func = nfsd4_savefh,
2277                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2278                 .op_name = "OP_SAVEFH",
2279                 .op_rsize_bop = nfsd4_only_status_rsize,
2280         },
2281         [OP_SECINFO] = {
2282                 .op_func = nfsd4_secinfo,
2283                 .op_release = nfsd4_secinfo_release,
2284                 .op_flags = OP_HANDLES_WRONGSEC,
2285                 .op_name = "OP_SECINFO",
2286                 .op_rsize_bop = nfsd4_secinfo_rsize,
2287         },
2288         [OP_SETATTR] = {
2289                 .op_func = nfsd4_setattr,
2290                 .op_name = "OP_SETATTR",
2291                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2292                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2293                 .op_rsize_bop = nfsd4_setattr_rsize,
2294                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2295         },
2296         [OP_SETCLIENTID] = {
2297                 .op_func = nfsd4_setclientid,
2298                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2299                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2300                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2301                 .op_name = "OP_SETCLIENTID",
2302                 .op_rsize_bop = nfsd4_setclientid_rsize,
2303         },
2304         [OP_SETCLIENTID_CONFIRM] = {
2305                 .op_func = nfsd4_setclientid_confirm,
2306                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2307                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2308                 .op_name = "OP_SETCLIENTID_CONFIRM",
2309                 .op_rsize_bop = nfsd4_only_status_rsize,
2310         },
2311         [OP_VERIFY] = {
2312                 .op_func = nfsd4_verify,
2313                 .op_name = "OP_VERIFY",
2314                 .op_rsize_bop = nfsd4_only_status_rsize,
2315         },
2316         [OP_WRITE] = {
2317                 .op_func = nfsd4_write,
2318                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2319                 .op_name = "OP_WRITE",
2320                 .op_rsize_bop = nfsd4_write_rsize,
2321                 .op_get_currentstateid = nfsd4_get_writestateid,
2322         },
2323         [OP_RELEASE_LOCKOWNER] = {
2324                 .op_func = nfsd4_release_lockowner,
2325                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2326                                 | OP_MODIFIES_SOMETHING,
2327                 .op_name = "OP_RELEASE_LOCKOWNER",
2328                 .op_rsize_bop = nfsd4_only_status_rsize,
2329         },
2330
2331         /* NFSv4.1 operations */
2332         [OP_EXCHANGE_ID] = {
2333                 .op_func = nfsd4_exchange_id,
2334                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2335                                 | OP_MODIFIES_SOMETHING,
2336                 .op_name = "OP_EXCHANGE_ID",
2337                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2338         },
2339         [OP_BACKCHANNEL_CTL] = {
2340                 .op_func = nfsd4_backchannel_ctl,
2341                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2342                 .op_name = "OP_BACKCHANNEL_CTL",
2343                 .op_rsize_bop = nfsd4_only_status_rsize,
2344         },
2345         [OP_BIND_CONN_TO_SESSION] = {
2346                 .op_func = nfsd4_bind_conn_to_session,
2347                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2348                                 | OP_MODIFIES_SOMETHING,
2349                 .op_name = "OP_BIND_CONN_TO_SESSION",
2350                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2351         },
2352         [OP_CREATE_SESSION] = {
2353                 .op_func = nfsd4_create_session,
2354                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2355                                 | OP_MODIFIES_SOMETHING,
2356                 .op_name = "OP_CREATE_SESSION",
2357                 .op_rsize_bop = nfsd4_create_session_rsize,
2358         },
2359         [OP_DESTROY_SESSION] = {
2360                 .op_func = nfsd4_destroy_session,
2361                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2362                                 | OP_MODIFIES_SOMETHING,
2363                 .op_name = "OP_DESTROY_SESSION",
2364                 .op_rsize_bop = nfsd4_only_status_rsize,
2365         },
2366         [OP_SEQUENCE] = {
2367                 .op_func = nfsd4_sequence,
2368                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2369                 .op_name = "OP_SEQUENCE",
2370                 .op_rsize_bop = nfsd4_sequence_rsize,
2371         },
2372         [OP_DESTROY_CLIENTID] = {
2373                 .op_func = nfsd4_destroy_clientid,
2374                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2375                                 | OP_MODIFIES_SOMETHING,
2376                 .op_name = "OP_DESTROY_CLIENTID",
2377                 .op_rsize_bop = nfsd4_only_status_rsize,
2378         },
2379         [OP_RECLAIM_COMPLETE] = {
2380                 .op_func = nfsd4_reclaim_complete,
2381                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2382                 .op_name = "OP_RECLAIM_COMPLETE",
2383                 .op_rsize_bop = nfsd4_only_status_rsize,
2384         },
2385         [OP_SECINFO_NO_NAME] = {
2386                 .op_func = nfsd4_secinfo_no_name,
2387                 .op_release = nfsd4_secinfo_no_name_release,
2388                 .op_flags = OP_HANDLES_WRONGSEC,
2389                 .op_name = "OP_SECINFO_NO_NAME",
2390                 .op_rsize_bop = nfsd4_secinfo_rsize,
2391         },
2392         [OP_TEST_STATEID] = {
2393                 .op_func = nfsd4_test_stateid,
2394                 .op_flags = ALLOWED_WITHOUT_FH,
2395                 .op_name = "OP_TEST_STATEID",
2396                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2397         },
2398         [OP_FREE_STATEID] = {
2399                 .op_func = nfsd4_free_stateid,
2400                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2401                 .op_name = "OP_FREE_STATEID",
2402                 .op_get_currentstateid = nfsd4_get_freestateid,
2403                 .op_rsize_bop = nfsd4_only_status_rsize,
2404         },
2405 #ifdef CONFIG_NFSD_PNFS
2406         [OP_GETDEVICEINFO] = {
2407                 .op_func = nfsd4_getdeviceinfo,
2408                 .op_release = nfsd4_getdeviceinfo_release,
2409                 .op_flags = ALLOWED_WITHOUT_FH,
2410                 .op_name = "OP_GETDEVICEINFO",
2411                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2412         },
2413         [OP_LAYOUTGET] = {
2414                 .op_func = nfsd4_layoutget,
2415                 .op_release = nfsd4_layoutget_release,
2416                 .op_flags = OP_MODIFIES_SOMETHING,
2417                 .op_name = "OP_LAYOUTGET",
2418                 .op_rsize_bop = nfsd4_layoutget_rsize,
2419         },
2420         [OP_LAYOUTCOMMIT] = {
2421                 .op_func = nfsd4_layoutcommit,
2422                 .op_flags = OP_MODIFIES_SOMETHING,
2423                 .op_name = "OP_LAYOUTCOMMIT",
2424                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2425         },
2426         [OP_LAYOUTRETURN] = {
2427                 .op_func = nfsd4_layoutreturn,
2428                 .op_flags = OP_MODIFIES_SOMETHING,
2429                 .op_name = "OP_LAYOUTRETURN",
2430                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2431         },
2432 #endif /* CONFIG_NFSD_PNFS */
2433
2434         /* NFSv4.2 operations */
2435         [OP_ALLOCATE] = {
2436                 .op_func = nfsd4_allocate,
2437                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2438                 .op_name = "OP_ALLOCATE",
2439                 .op_rsize_bop = nfsd4_only_status_rsize,
2440         },
2441         [OP_DEALLOCATE] = {
2442                 .op_func = nfsd4_deallocate,
2443                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2444                 .op_name = "OP_DEALLOCATE",
2445                 .op_rsize_bop = nfsd4_only_status_rsize,
2446         },
2447         [OP_CLONE] = {
2448                 .op_func = nfsd4_clone,
2449                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2450                 .op_name = "OP_CLONE",
2451                 .op_rsize_bop = nfsd4_only_status_rsize,
2452         },
2453         [OP_COPY] = {
2454                 .op_func = nfsd4_copy,
2455                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2456                 .op_name = "OP_COPY",
2457                 .op_rsize_bop = nfsd4_copy_rsize,
2458         },
2459         [OP_SEEK] = {
2460                 .op_func = nfsd4_seek,
2461                 .op_name = "OP_SEEK",
2462                 .op_rsize_bop = nfsd4_seek_rsize,
2463         },
2464 };
2465
2466 /**
2467  * nfsd4_spo_must_allow - Determine if the compound op contains an
2468  * operation that is allowed to be sent with machine credentials
2469  *
2470  * @rqstp: a pointer to the struct svc_rqst
2471  *
2472  * Checks to see if the compound contains a spo_must_allow op
2473  * and confirms that it was sent with the proper machine creds.
2474  */
2475
2476 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2477 {
2478         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2479         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2480         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2481         struct nfsd4_compound_state *cstate = &resp->cstate;
2482         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2483         u32 opiter;
2484
2485         if (!cstate->minorversion)
2486                 return false;
2487
2488         if (cstate->spo_must_allowed == true)
2489                 return true;
2490
2491         opiter = resp->opcnt;
2492         while (opiter < argp->opcnt) {
2493                 this = &argp->ops[opiter++];
2494                 if (test_bit(this->opnum, allow->u.longs) &&
2495                         cstate->clp->cl_mach_cred &&
2496                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2497                         cstate->spo_must_allowed = true;
2498                         return true;
2499                 }
2500         }
2501         cstate->spo_must_allowed = false;
2502         return false;
2503 }
2504
2505 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2506 {
2507         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2508                 return op_encode_hdr_size * sizeof(__be32);
2509
2510         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2511         return OPDESC(op)->op_rsize_bop(rqstp, op);
2512 }
2513
2514 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2515 {
2516         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2517                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2518                         op->opnum, nfsd4_op_name(op->opnum));
2519                 WARN_ON_ONCE(1);
2520         }
2521 }
2522
2523 static const char *nfsd4_op_name(unsigned opnum)
2524 {
2525         if (opnum < ARRAY_SIZE(nfsd4_ops))
2526                 return nfsd4_ops[opnum].op_name;
2527         return "unknown_operation";
2528 }
2529
2530 #define nfsd4_voidres                   nfsd4_voidargs
2531 struct nfsd4_voidargs { int dummy; };
2532
2533 static const struct svc_procedure nfsd_procedures4[2] = {
2534         [NFSPROC4_NULL] = {
2535                 .pc_func = nfsd4_proc_null,
2536                 .pc_encode = nfs4svc_encode_voidres,
2537                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2538                 .pc_ressize = sizeof(struct nfsd4_voidres),
2539                 .pc_cachetype = RC_NOCACHE,
2540                 .pc_xdrressize = 1,
2541         },
2542         [NFSPROC4_COMPOUND] = {
2543                 .pc_func = nfsd4_proc_compound,
2544                 .pc_decode = nfs4svc_decode_compoundargs,
2545                 .pc_encode = nfs4svc_encode_compoundres,
2546                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2547                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2548                 .pc_release = nfsd4_release_compoundargs,
2549                 .pc_cachetype = RC_NOCACHE,
2550                 .pc_xdrressize = NFSD_BUFSIZE/4,
2551         },
2552 };
2553
2554 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2555 const struct svc_version nfsd_version4 = {
2556         .vs_vers                = 4,
2557         .vs_nproc               = 2,
2558         .vs_proc                = nfsd_procedures4,
2559         .vs_count               = nfsd_count3,
2560         .vs_dispatch            = nfsd_dispatch,
2561         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2562         .vs_rpcb_optnl          = true,
2563         .vs_need_cong_ctrl      = true,
2564 };
2565
2566 /*
2567  * Local variables:
2568  *  c-basic-offset: 8
2569  * End:
2570  */