fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/slab.h>
  37
  38 #include "idmap.h"
  39 #include "cache.h"
  40 #include "xdr4.h"
  41 #include "vfs.h"
  42 #include "current_stateid.h"
  43 #include "netns.h"
  44 #include "acl.h"
  45
  46 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  47 #include <linux/security.h>
  48
  49 static inline void
  50 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  51 {
  52         struct inode *inode = resfh->fh_dentry->d_inode;
  53         int status;
  54
  55         mutex_lock(&inode->i_mutex);
  56         status = security_inode_setsecctx(resfh->fh_dentry,
  57                 label->data, label->len);
  58         mutex_unlock(&inode->i_mutex);
  59
  60         if (status)
  61                 /*
  62                  * XXX: We should really fail the whole open, but we may
  63                  * already have created a new file, so it may be too
  64                  * late.  For now this seems the least of evils:
  65                  */
  66                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  67
  68         return;
  69 }
  70 #else
  71 static inline void
  72 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  73 { }
  74 #endif
  75
  76 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  77
  78 static u32 nfsd_attrmask[] = {
  79         NFSD_WRITEABLE_ATTRS_WORD0,
  80         NFSD_WRITEABLE_ATTRS_WORD1,
  81         NFSD_WRITEABLE_ATTRS_WORD2
  82 };
  83
  84 static u32 nfsd41_ex_attrmask[] = {
  85         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  86         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  87         NFSD_SUPPATTR_EXCLCREAT_WORD2
  88 };
  89
  90 static __be32
  91 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  92                    u32 *bmval, u32 *writable)
  93 {
  94         struct dentry *dentry = cstate->current_fh.fh_dentry;
  95
  96         /*
  97          * Check about attributes are supported by the NFSv4 server or not.
  98          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  99          */
 100         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 101             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 102             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 103                 return nfserr_attrnotsupp;
 104
 105         /*
 106          * Check FATTR4_WORD0_ACL can be supported
 107          * in current environment or not.
 108          */
 109         if (bmval[0] & FATTR4_WORD0_ACL) {
 110                 if (!IS_POSIXACL(dentry->d_inode))
 111                         return nfserr_attrnotsupp;
 112         }
 113
 114         /*
 115          * According to spec, read-only attributes return ERR_INVAL.
 116          */
 117         if (writable) {
 118                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 119                     (bmval[2] & ~writable[2]))
 120                         return nfserr_inval;
 121         }
 122
 123         return nfs_ok;
 124 }
 125
 126 static __be32
 127 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 128         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 129 {
 130         __be32 status = nfs_ok;
 131
 132         if (open->op_create == NFS4_OPEN_CREATE) {
 133                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 134                     || open->op_createmode == NFS4_CREATE_GUARDED)
 135                         status = check_attr_support(rqstp, cstate,
 136                                         open->op_bmval, nfsd_attrmask);
 137                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 138                         status = check_attr_support(rqstp, cstate,
 139                                         open->op_bmval, nfsd41_ex_attrmask);
 140         }
 141
 142         return status;
 143 }
 144
 145 static int
 146 is_create_with_attrs(struct nfsd4_open *open)
 147 {
 148         return open->op_create == NFS4_OPEN_CREATE
 149                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 150                     || open->op_createmode == NFS4_CREATE_GUARDED
 151                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 152 }
 153
 154 /*
 155  * if error occurs when setting the acl, just clear the acl bit
 156  * in the returned attr bitmap.
 157  */
 158 static void
 159 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 160                 struct nfs4_acl *acl, u32 *bmval)
 161 {
 162         __be32 status;
 163
 164         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 165         if (status)
 166                 /*
 167                  * We should probably fail the whole open at this point,
 168                  * but we've already created the file, so it's too late;
 169                  * So this seems the least of evils:
 170                  */
 171                 bmval[0] &= ~FATTR4_WORD0_ACL;
 172 }
 173
 174 static inline void
 175 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 176 {
 177         fh_put(dst);
 178         dget(src->fh_dentry);
 179         if (src->fh_export)
 180                 exp_get(src->fh_export);
 181         *dst = *src;
 182 }
 183
 184 static __be32
 185 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 186 {
 187         __be32 status;
 188
 189         if (open->op_truncate &&
 190                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 191                 return nfserr_inval;
 192
 193         accmode |= NFSD_MAY_READ_IF_EXEC;
 194
 195         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 196                 accmode |= NFSD_MAY_READ;
 197         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 198                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 199         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 200                 accmode |= NFSD_MAY_WRITE;
 201
 202         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 203
 204         return status;
 205 }
 206
 207 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 208 {
 209         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 210
 211         if (S_ISREG(mode))
 212                 return nfs_ok;
 213         if (S_ISDIR(mode))
 214                 return nfserr_isdir;
 215         /*
 216          * Using err_symlink as our catch-all case may look odd; but
 217          * there's no other obvious error for this case in 4.0, and we
 218          * happen to know that it will cause the linux v4 client to do
 219          * the right thing on attempts to open something other than a
 220          * regular file.
 221          */
 222         return nfserr_symlink;
 223 }
 224
 225 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 226 {
 227         if (nfsd4_has_session(cstate))
 228                 return;
 229         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 230                         &resfh->fh_handle);
 231 }
 232
 233 static __be32
 234 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 235 {
 236         struct svc_fh *current_fh = &cstate->current_fh;
 237         int accmode;
 238         __be32 status;
 239
 240         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 241         if (!*resfh)
 242                 return nfserr_jukebox;
 243         fh_init(*resfh, NFS4_FHSIZE);
 244         open->op_truncate = 0;
 245
 246         if (open->op_create) {
 247                 /* FIXME: check session persistence and pnfs flags.
 248                  * The nfsv4.1 spec requires the following semantics:
 249                  *
 250                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 251                  * Reply Cache  | server |                 |
 252                  * -------------+--------+-----------------+--------------------
 253                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 254                  *              |        |                 | (SHOULD)
 255                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 256                  *              |        |                 | (SHOULD NOT)
 257                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 258                  * yes          | no     | GUARDED4        | GUARDED4
 259                  * yes          | yes    | GUARDED4        | GUARDED4
 260                  */
 261
 262                 /*
 263                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 264                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 265                  */
 266                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 267                                         open->op_fname.len, &open->op_iattr,
 268                                         *resfh, open->op_createmode,
 269                                         (u32 *)open->op_verf.data,
 270                                         &open->op_truncate, &open->op_created);
 271
 272                 if (!status && open->op_label.len)
 273                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 274
 275                 /*
 276                  * Following rfc 3530 14.2.16, use the returned bitmask
 277                  * to indicate which attributes we used to store the
 278                  * verifier:
 279                  */
 280                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 281                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 282                                                         FATTR4_WORD1_TIME_MODIFY);
 283         } else
 284                 /*
 285                  * Note this may exit with the parent still locked.
 286                  * We will hold the lock until nfsd4_open's final
 287                  * lookup, to prevent renames or unlinks until we've had
 288                  * a chance to an acquire a delegation if appropriate.
 289                  */
 290                 status = nfsd_lookup(rqstp, current_fh,
 291                                      open->op_fname.data, open->op_fname.len, *resfh);
 292         if (status)
 293                 goto out;
 294         status = nfsd_check_obj_isreg(*resfh);
 295         if (status)
 296                 goto out;
 297
 298         if (is_create_with_attrs(open) && open->op_acl != NULL)
 299                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 300
 301         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 302         accmode = NFSD_MAY_NOP;
 303         if (open->op_created ||
 304                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 305                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 306         status = do_open_permission(rqstp, *resfh, open, accmode);
 307         set_change_info(&open->op_cinfo, current_fh);
 308 out:
 309         return status;
 310 }
 311
 312 static __be32
 313 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 314 {
 315         struct svc_fh *current_fh = &cstate->current_fh;
 316         __be32 status;
 317         int accmode = 0;
 318
 319         /* We don't know the target directory, and therefore can not
 320         * set the change info
 321         */
 322
 323         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 324
 325         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 326
 327         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 328                 (open->op_iattr.ia_size == 0);
 329         /*
 330          * In the delegation case, the client is telling us about an
 331          * open that it *already* performed locally, some time ago.  We
 332          * should let it succeed now if possible.
 333          *
 334          * In the case of a CLAIM_FH open, on the other hand, the client
 335          * may be counting on us to enforce permissions (the Linux 4.1
 336          * client uses this for normal opens, for example).
 337          */
 338         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 339                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 340
 341         status = do_open_permission(rqstp, current_fh, open, accmode);
 342
 343         return status;
 344 }
 345
 346 static void
 347 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 348 {
 349         struct nfsd4_sessionid *sid =
 350                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 351
 352         clid->cl_boot = sid->clientid.cl_boot;
 353         clid->cl_id = sid->clientid.cl_id;
 354 }
 355
 356 static __be32
 357 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 358            struct nfsd4_open *open)
 359 {
 360         __be32 status;
 361         struct svc_fh *resfh = NULL;
 362         struct nfsd4_compoundres *resp;
 363         struct net *net = SVC_NET(rqstp);
 364         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 365
 366         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 367                 (int)open->op_fname.len, open->op_fname.data,
 368                 open->op_openowner);
 369
 370         /* This check required by spec. */
 371         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 372                 return nfserr_inval;
 373
 374         open->op_created = 0;
 375         /*
 376          * RFC5661 18.51.3
 377          * Before RECLAIM_COMPLETE done, server should deny new lock
 378          */
 379         if (nfsd4_has_session(cstate) &&
 380             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 381                       &cstate->session->se_client->cl_flags) &&
 382             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 383                 return nfserr_grace;
 384
 385         if (nfsd4_has_session(cstate))
 386                 copy_clientid(&open->op_clientid, cstate->session);
 387
 388         /* check seqid for replay. set nfs4_owner */
 389         resp = rqstp->rq_resp;
 390         status = nfsd4_process_open1(&resp->cstate, open, nn);
 391         if (status == nfserr_replay_me) {
 392                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 393                 fh_put(&cstate->current_fh);
 394                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 395                                 &rp->rp_openfh);
 396                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 397                 if (status)
 398                         dprintk("nfsd4_open: replay failed"
 399                                 " restoring previous filehandle\n");
 400                 else
 401                         status = nfserr_replay_me;
 402         }
 403         if (status)
 404                 goto out;
 405         if (open->op_xdr_error) {
 406                 status = open->op_xdr_error;
 407                 goto out;
 408         }
 409
 410         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 411         if (status)
 412                 goto out;
 413
 414         /* Openowner is now set, so sequence id will get bumped.  Now we need
 415          * these checks before we do any creates: */
 416         status = nfserr_grace;
 417         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 418                 goto out;
 419         status = nfserr_no_grace;
 420         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 421                 goto out;
 422
 423         switch (open->op_claim_type) {
 424                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 425                 case NFS4_OPEN_CLAIM_NULL:
 426                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 427                         if (status)
 428                                 goto out;
 429                         break;
 430                 case NFS4_OPEN_CLAIM_PREVIOUS:
 431                         status = nfs4_check_open_reclaim(&open->op_clientid,
 432                                                          cstate, nn);
 433                         if (status)
 434                                 goto out;
 435                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 436                 case NFS4_OPEN_CLAIM_FH:
 437                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 438                         status = do_open_fhandle(rqstp, cstate, open);
 439                         if (status)
 440                                 goto out;
 441                         resfh = &cstate->current_fh;
 442                         break;
 443                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 444                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 445                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 446                                 open->op_claim_type);
 447                         status = nfserr_notsupp;
 448                         goto out;
 449                 default:
 450                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 451                                 open->op_claim_type);
 452                         status = nfserr_inval;
 453                         goto out;
 454         }
 455         /*
 456          * nfsd4_process_open2() does the actual opening of the file.  If
 457          * successful, it (1) truncates the file if open->op_truncate was
 458          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 459          */
 460         status = nfsd4_process_open2(rqstp, resfh, open);
 461         WARN(status && open->op_created,
 462              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 463              be32_to_cpu(status));
 464 out:
 465         if (resfh && resfh != &cstate->current_fh) {
 466                 fh_dup2(&cstate->current_fh, resfh);
 467                 fh_put(resfh);
 468                 kfree(resfh);
 469         }
 470         nfsd4_cleanup_open_state(cstate, open, status);
 471         nfsd4_bump_seqid(cstate, status);
 472         return status;
 473 }
 474
 475 /*
 476  * OPEN is the only seqid-mutating operation whose decoding can fail
 477  * with a seqid-mutating error (specifically, decoding of user names in
 478  * the attributes).  Therefore we have to do some processing to look up
 479  * the stateowner so that we can bump the seqid.
 480  */
 481 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 482 {
 483         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 484
 485         if (!seqid_mutating_err(ntohl(op->status)))
 486                 return op->status;
 487         if (nfsd4_has_session(cstate))
 488                 return op->status;
 489         open->op_xdr_error = op->status;
 490         return nfsd4_open(rqstp, cstate, open);
 491 }
 492
 493 /*
 494  * filehandle-manipulating ops.
 495  */
 496 static __be32
 497 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 498             struct svc_fh **getfh)
 499 {
 500         if (!cstate->current_fh.fh_dentry)
 501                 return nfserr_nofilehandle;
 502
 503         *getfh = &cstate->current_fh;
 504         return nfs_ok;
 505 }
 506
 507 static __be32
 508 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 509             struct nfsd4_putfh *putfh)
 510 {
 511         fh_put(&cstate->current_fh);
 512         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 513         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 514                putfh->pf_fhlen);
 515         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 516 }
 517
 518 static __be32
 519 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 520                 void *arg)
 521 {
 522         __be32 status;
 523
 524         fh_put(&cstate->current_fh);
 525         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 526         return status;
 527 }
 528
 529 static __be32
 530 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 531                 void *arg)
 532 {
 533         if (!cstate->save_fh.fh_dentry)
 534                 return nfserr_restorefh;
 535
 536         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 537         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 538                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 539                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 540         }
 541         return nfs_ok;
 542 }
 543
 544 static __be32
 545 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 546              void *arg)
 547 {
 548         if (!cstate->current_fh.fh_dentry)
 549                 return nfserr_nofilehandle;
 550
 551         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 552         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 553                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 554                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 555         }
 556         return nfs_ok;
 557 }
 558
 559 /*
 560  * misc nfsv4 ops
 561  */
 562 static __be32
 563 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 564              struct nfsd4_access *access)
 565 {
 566         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 567                 return nfserr_inval;
 568
 569         access->ac_resp_access = access->ac_req_access;
 570         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 571                            &access->ac_supported);
 572 }
 573
 574 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 575 {
 576         __be32 verf[2];
 577         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 578
 579         /*
 580          * This is opaque to client, so no need to byte-swap. Use
 581          * __force to keep sparse happy
 582          */
 583         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 584         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 585         memcpy(verifier->data, verf, sizeof(verifier->data));
 586 }
 587
 588 static __be32
 589 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 590              struct nfsd4_commit *commit)
 591 {
 592         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 593         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 594                              commit->co_count);
 595 }
 596
 597 static __be32
 598 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 599              struct nfsd4_create *create)
 600 {
 601         struct svc_fh resfh;
 602         __be32 status;
 603         dev_t rdev;
 604
 605         fh_init(&resfh, NFS4_FHSIZE);
 606
 607         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 608                            NFSD_MAY_CREATE);
 609         if (status)
 610                 return status;
 611
 612         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 613                                     nfsd_attrmask);
 614         if (status)
 615                 return status;
 616
 617         switch (create->cr_type) {
 618         case NF4LNK:
 619                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 620                                       create->cr_name, create->cr_namelen,
 621                                       create->cr_data, &resfh);
 622                 break;
 623
 624         case NF4BLK:
 625                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 626                 if (MAJOR(rdev) != create->cr_specdata1 ||
 627                     MINOR(rdev) != create->cr_specdata2)
 628                         return nfserr_inval;
 629                 status = nfsd_create(rqstp, &cstate->current_fh,
 630                                      create->cr_name, create->cr_namelen,
 631                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 632                 break;
 633
 634         case NF4CHR:
 635                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 636                 if (MAJOR(rdev) != create->cr_specdata1 ||
 637                     MINOR(rdev) != create->cr_specdata2)
 638                         return nfserr_inval;
 639                 status = nfsd_create(rqstp, &cstate->current_fh,
 640                                      create->cr_name, create->cr_namelen,
 641                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 642                 break;
 643
 644         case NF4SOCK:
 645                 status = nfsd_create(rqstp, &cstate->current_fh,
 646                                      create->cr_name, create->cr_namelen,
 647                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 648                 break;
 649
 650         case NF4FIFO:
 651                 status = nfsd_create(rqstp, &cstate->current_fh,
 652                                      create->cr_name, create->cr_namelen,
 653                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 654                 break;
 655
 656         case NF4DIR:
 657                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 658                 status = nfsd_create(rqstp, &cstate->current_fh,
 659                                      create->cr_name, create->cr_namelen,
 660                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 661                 break;
 662
 663         default:
 664                 status = nfserr_badtype;
 665         }
 666
 667         if (status)
 668                 goto out;
 669
 670         if (create->cr_label.len)
 671                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 672
 673         if (create->cr_acl != NULL)
 674                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 675                                 create->cr_bmval);
 676
 677         fh_unlock(&cstate->current_fh);
 678         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 679         fh_dup2(&cstate->current_fh, &resfh);
 680 out:
 681         fh_put(&resfh);
 682         return status;
 683 }
 684
 685 static __be32
 686 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 687               struct nfsd4_getattr *getattr)
 688 {
 689         __be32 status;
 690
 691         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 692         if (status)
 693                 return status;
 694
 695         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 696                 return nfserr_inval;
 697
 698         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 699         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 700         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 701
 702         getattr->ga_fhp = &cstate->current_fh;
 703         return nfs_ok;
 704 }
 705
 706 static __be32
 707 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 708            struct nfsd4_link *link)
 709 {
 710         __be32 status = nfserr_nofilehandle;
 711
 712         if (!cstate->save_fh.fh_dentry)
 713                 return status;
 714         status = nfsd_link(rqstp, &cstate->current_fh,
 715                            link->li_name, link->li_namelen, &cstate->save_fh);
 716         if (!status)
 717                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 718         return status;
 719 }
 720
 721 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 722 {
 723         struct svc_fh tmp_fh;
 724         __be32 ret;
 725
 726         fh_init(&tmp_fh, NFS4_FHSIZE);
 727         ret = exp_pseudoroot(rqstp, &tmp_fh);
 728         if (ret)
 729                 return ret;
 730         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 731                 fh_put(&tmp_fh);
 732                 return nfserr_noent;
 733         }
 734         fh_put(&tmp_fh);
 735         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 736 }
 737
 738 static __be32
 739 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 740               void *arg)
 741 {
 742         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 743 }
 744
 745 static __be32
 746 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 747              struct nfsd4_lookup *lookup)
 748 {
 749         return nfsd_lookup(rqstp, &cstate->current_fh,
 750                            lookup->lo_name, lookup->lo_len,
 751                            &cstate->current_fh);
 752 }
 753
 754 static __be32
 755 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 756            struct nfsd4_read *read)
 757 {
 758         __be32 status;
 759
 760         /* no need to check permission - this will be done in nfsd_read() */
 761
 762         read->rd_filp = NULL;
 763         if (read->rd_offset >= OFFSET_MAX)
 764                 return nfserr_inval;
 765
 766         /*
 767          * If we do a zero copy read, then a client will see read data
 768          * that reflects the state of the file *after* performing the
 769          * following compound.
 770          *
 771          * To ensure proper ordering, we therefore turn off zero copy if
 772          * the client wants us to do more in this compound:
 773          */
 774         if (!nfsd4_last_compound_op(rqstp))
 775                 rqstp->rq_splice_ok = false;
 776
 777         /* check stateid */
 778         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 779                                                  cstate, &read->rd_stateid,
 780                                                  RD_STATE, &read->rd_filp))) {
 781                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 782                 goto out;
 783         }
 784         status = nfs_ok;
 785 out:
 786         read->rd_rqstp = rqstp;
 787         read->rd_fhp = &cstate->current_fh;
 788         return status;
 789 }
 790
 791 static __be32
 792 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 793               struct nfsd4_readdir *readdir)
 794 {
 795         u64 cookie = readdir->rd_cookie;
 796         static const nfs4_verifier zeroverf;
 797
 798         /* no need to check permission - this will be done in nfsd_readdir() */
 799
 800         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 801                 return nfserr_inval;
 802
 803         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 804         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 805         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 806
 807         if ((cookie == 1) || (cookie == 2) ||
 808             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 809                 return nfserr_bad_cookie;
 810
 811         readdir->rd_rqstp = rqstp;
 812         readdir->rd_fhp = &cstate->current_fh;
 813         return nfs_ok;
 814 }
 815
 816 static __be32
 817 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 818                struct nfsd4_readlink *readlink)
 819 {
 820         readlink->rl_rqstp = rqstp;
 821         readlink->rl_fhp = &cstate->current_fh;
 822         return nfs_ok;
 823 }
 824
 825 static __be32
 826 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 827              struct nfsd4_remove *remove)
 828 {
 829         __be32 status;
 830
 831         if (locks_in_grace(SVC_NET(rqstp)))
 832                 return nfserr_grace;
 833         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 834                              remove->rm_name, remove->rm_namelen);
 835         if (!status) {
 836                 fh_unlock(&cstate->current_fh);
 837                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 838         }
 839         return status;
 840 }
 841
 842 static __be32
 843 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 844              struct nfsd4_rename *rename)
 845 {
 846         __be32 status = nfserr_nofilehandle;
 847
 848         if (!cstate->save_fh.fh_dentry)
 849                 return status;
 850         if (locks_in_grace(SVC_NET(rqstp)) &&
 851                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 852                 return nfserr_grace;
 853         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 854                              rename->rn_snamelen, &cstate->current_fh,
 855                              rename->rn_tname, rename->rn_tnamelen);
 856         if (status)
 857                 return status;
 858         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 859         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 860         return nfs_ok;
 861 }
 862
 863 static __be32
 864 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 865               struct nfsd4_secinfo *secinfo)
 866 {
 867         struct svc_fh resfh;
 868         struct svc_export *exp;
 869         struct dentry *dentry;
 870         __be32 err;
 871
 872         fh_init(&resfh, NFS4_FHSIZE);
 873         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 874         if (err)
 875                 return err;
 876         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 877                                     secinfo->si_name, secinfo->si_namelen,
 878                                     &exp, &dentry);
 879         if (err)
 880                 return err;
 881         if (dentry->d_inode == NULL) {
 882                 exp_put(exp);
 883                 err = nfserr_noent;
 884         } else
 885                 secinfo->si_exp = exp;
 886         dput(dentry);
 887         if (cstate->minorversion)
 888                 /* See rfc 5661 section 2.6.3.1.1.8 */
 889                 fh_put(&cstate->current_fh);
 890         return err;
 891 }
 892
 893 static __be32
 894 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 895               struct nfsd4_secinfo_no_name *sin)
 896 {
 897         __be32 err;
 898
 899         switch (sin->sin_style) {
 900         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 901                 break;
 902         case NFS4_SECINFO_STYLE4_PARENT:
 903                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 904                 if (err)
 905                         return err;
 906                 break;
 907         default:
 908                 return nfserr_inval;
 909         }
 910
 911         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 912         fh_put(&cstate->current_fh);
 913         return nfs_ok;
 914 }
 915
 916 static __be32
 917 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 918               struct nfsd4_setattr *setattr)
 919 {
 920         __be32 status = nfs_ok;
 921         int err;
 922
 923         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 924                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 925                         &setattr->sa_stateid, WR_STATE, NULL);
 926                 if (status) {
 927                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 928                         return status;
 929                 }
 930         }
 931         err = fh_want_write(&cstate->current_fh);
 932         if (err)
 933                 return nfserrno(err);
 934         status = nfs_ok;
 935
 936         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 937                                     nfsd_attrmask);
 938         if (status)
 939                 goto out;
 940
 941         if (setattr->sa_acl != NULL)
 942                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 943                                             setattr->sa_acl);
 944         if (status)
 945                 goto out;
 946         if (setattr->sa_label.len)
 947                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 948                                 &setattr->sa_label);
 949         if (status)
 950                 goto out;
 951         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 952                                 0, (time_t)0);
 953 out:
 954         fh_drop_write(&cstate->current_fh);
 955         return status;
 956 }
 957
 958 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 959 {
 960         int i = 1;
 961         int buflen = write->wr_buflen;
 962
 963         vec[0].iov_base = write->wr_head.iov_base;
 964         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 965         buflen -= vec[0].iov_len;
 966
 967         while (buflen) {
 968                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 969                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 970                 buflen -= vec[i].iov_len;
 971                 i++;
 972         }
 973         return i;
 974 }
 975
 976 static __be32
 977 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 978             struct nfsd4_write *write)
 979 {
 980         stateid_t *stateid = &write->wr_stateid;
 981         struct file *filp = NULL;
 982         __be32 status = nfs_ok;
 983         unsigned long cnt;
 984         int nvecs;
 985
 986         /* no need to check permission - this will be done in nfsd_write() */
 987
 988         if (write->wr_offset >= OFFSET_MAX)
 989                 return nfserr_inval;
 990
 991         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 992                                         cstate, stateid, WR_STATE, &filp);
 993         if (status) {
 994                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 995                 return status;
 996         }
 997
 998         cnt = write->wr_buflen;
 999         write->wr_how_written = write->wr_stable_how;
1000         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1001
1002         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1003         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1004
1005         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1006                              write->wr_offset, rqstp->rq_vec, nvecs,
1007                              &cnt, &write->wr_how_written);
1008         if (filp)
1009                 fput(filp);
1010
1011         write->wr_bytes_written = cnt;
1012
1013         return status;
1014 }
1015
1016 /* This routine never returns NFS_OK!  If there are no other errors, it
1017  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1018  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1019  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1020  */
1021 static __be32
1022 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1023              struct nfsd4_verify *verify)
1024 {
1025         __be32 *buf, *p;
1026         int count;
1027         __be32 status;
1028
1029         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1030         if (status)
1031                 return status;
1032
1033         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1034         if (status)
1035                 return status;
1036
1037         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1038             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1039                 return nfserr_inval;
1040         if (verify->ve_attrlen & 3)
1041                 return nfserr_inval;
1042
1043         /* count in words:
1044          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1045          */
1046         count = 4 + (verify->ve_attrlen >> 2);
1047         buf = kmalloc(count << 2, GFP_KERNEL);
1048         if (!buf)
1049                 return nfserr_jukebox;
1050
1051         p = buf;
1052         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1053                                     cstate->current_fh.fh_export,
1054                                     cstate->current_fh.fh_dentry,
1055                                     verify->ve_bmval,
1056                                     rqstp, 0);
1057         /*
1058          * If nfsd4_encode_fattr() ran out of space, assume that's because
1059          * the attributes are longer (hence different) than those given:
1060          */
1061         if (status == nfserr_resource)
1062                 status = nfserr_not_same;
1063         if (status)
1064                 goto out_kfree;
1065
1066         /* skip bitmap */
1067         p = buf + 1 + ntohl(buf[0]);
1068         status = nfserr_not_same;
1069         if (ntohl(*p++) != verify->ve_attrlen)
1070                 goto out_kfree;
1071         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1072                 status = nfserr_same;
1073
1074 out_kfree:
1075         kfree(buf);
1076         return status;
1077 }
1078
1079 static __be32
1080 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1081               struct nfsd4_verify *verify)
1082 {
1083         __be32 status;
1084
1085         status = _nfsd4_verify(rqstp, cstate, verify);
1086         return status == nfserr_not_same ? nfs_ok : status;
1087 }
1088
1089 static __be32
1090 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1091              struct nfsd4_verify *verify)
1092 {
1093         __be32 status;
1094
1095         status = _nfsd4_verify(rqstp, cstate, verify);
1096         return status == nfserr_same ? nfs_ok : status;
1097 }
1098
1099 /*
1100  * NULL call.
1101  */
1102 static __be32
1103 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1104 {
1105         return nfs_ok;
1106 }
1107
1108 static inline void nfsd4_increment_op_stats(u32 opnum)
1109 {
1110         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1111                 nfsdstats.nfs4_opcount[opnum]++;
1112 }
1113
1114 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1115                               void *);
1116 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1117 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1118 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1119
1120 enum nfsd4_op_flags {
1121         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1122         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1123         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1124         /* For rfc 5661 section 2.6.3.1.1: */
1125         OP_HANDLES_WRONGSEC = 1 << 3,
1126         OP_IS_PUTFH_LIKE = 1 << 4,
1127         /*
1128          * These are the ops whose result size we estimate before
1129          * encoding, to avoid performing an op then not being able to
1130          * respond or cache a response.  This includes writes and setattrs
1131          * as well as the operations usually called "nonidempotent":
1132          */
1133         OP_MODIFIES_SOMETHING = 1 << 5,
1134         /*
1135          * Cache compounds containing these ops in the xid-based drc:
1136          * We use the DRC for compounds containing non-idempotent
1137          * operations, *except* those that are 4.1-specific (since
1138          * sessions provide their own EOS), and except for stateful
1139          * operations other than setclientid and setclientid_confirm
1140          * (since sequence numbers provide EOS for open, lock, etc in
1141          * the v4.0 case).
1142          */
1143         OP_CACHEME = 1 << 6,
1144         /*
1145          * These are ops which clear current state id.
1146          */
1147         OP_CLEAR_STATEID = 1 << 7,
1148 };
1149
1150 struct nfsd4_operation {
1151         nfsd4op_func op_func;
1152         u32 op_flags;
1153         char *op_name;
1154         /* Try to get response size before operation */
1155         nfsd4op_rsize op_rsize_bop;
1156         stateid_getter op_get_currentstateid;
1157         stateid_setter op_set_currentstateid;
1158 };
1159
1160 static struct nfsd4_operation nfsd4_ops[];
1161
1162 static const char *nfsd4_op_name(unsigned opnum);
1163
1164 /*
1165  * Enforce NFSv4.1 COMPOUND ordering rules:
1166  *
1167  * Also note, enforced elsewhere:
1168  *      - SEQUENCE other than as first op results in
1169  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1170  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1171  *        (Enforced in nfsd4_bind_conn_to_session().)
1172  *      - DESTROY_SESSION must be the final operation in a compound, if
1173  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1174  *        (Enforced in nfsd4_destroy_session().)
1175  */
1176 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1177 {
1178         struct nfsd4_op *op = &args->ops[0];
1179
1180         /* These ordering requirements don't apply to NFSv4.0: */
1181         if (args->minorversion == 0)
1182                 return nfs_ok;
1183         /* This is weird, but OK, not our problem: */
1184         if (args->opcnt == 0)
1185                 return nfs_ok;
1186         if (op->status == nfserr_op_illegal)
1187                 return nfs_ok;
1188         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1189                 return nfserr_op_not_in_session;
1190         if (op->opnum == OP_SEQUENCE)
1191                 return nfs_ok;
1192         if (args->opcnt != 1)
1193                 return nfserr_not_only_op;
1194         return nfs_ok;
1195 }
1196
1197 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1198 {
1199         return &nfsd4_ops[op->opnum];
1200 }
1201
1202 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1203 {
1204         if (op->opnum == OP_ILLEGAL)
1205                 return false;
1206         return OPDESC(op)->op_flags & OP_CACHEME;
1207 }
1208
1209 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1210 {
1211         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1212         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1213         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1214         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1215         struct nfsd4_operation *thisd;
1216         struct nfsd4_operation *nextd;
1217
1218         thisd = OPDESC(this);
1219         /*
1220          * Most ops check wronsec on our own; only the putfh-like ops
1221          * have special rules.
1222          */
1223         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1224                 return false;
1225         /*
1226          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1227          * put-filehandle operation if we're not going to use the
1228          * result:
1229          */
1230         if (argp->opcnt == resp->opcnt)
1231                 return false;
1232
1233         nextd = OPDESC(next);
1234         /*
1235          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1236          * errors themselves as necessary; others should check for them
1237          * now:
1238          */
1239         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1240 }
1241
1242 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1243                                struct nfsd4_compoundres *resp)
1244 {
1245         struct xdr_stream *xdr = &resp->xdr;
1246         struct xdr_buf *buf = &rqstp->rq_res;
1247         struct kvec *head = buf->head;
1248
1249         xdr->buf = buf;
1250         xdr->iov = head;
1251         xdr->p   = head->iov_base + head->iov_len;
1252         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1253         /* Tail and page_len should be zero at this point: */
1254         buf->len = buf->head[0].iov_len;
1255         xdr->scratch.iov_len = 0;
1256         xdr->page_ptr = buf->pages - 1;
1257         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1258                 - rqstp->rq_auth_slack;
1259 }
1260
1261 /*
1262  * COMPOUND call.
1263  */
1264 static __be32
1265 nfsd4_proc_compound(struct svc_rqst *rqstp,
1266                     struct nfsd4_compoundargs *args,
1267                     struct nfsd4_compoundres *resp)
1268 {
1269         struct nfsd4_op *op;
1270         struct nfsd4_operation *opdesc;
1271         struct nfsd4_compound_state *cstate = &resp->cstate;
1272         struct svc_fh *current_fh = &cstate->current_fh;
1273         struct svc_fh *save_fh = &cstate->save_fh;
1274         __be32          status;
1275
1276         svcxdr_init_encode(rqstp, resp);
1277         resp->tagp = resp->xdr.p;
1278         /* reserve space for: taglen, tag, and opcnt */
1279         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1280         resp->taglen = args->taglen;
1281         resp->tag = args->tag;
1282         resp->rqstp = rqstp;
1283         cstate->minorversion = args->minorversion;
1284         fh_init(current_fh, NFS4_FHSIZE);
1285         fh_init(save_fh, NFS4_FHSIZE);
1286         /*
1287          * Don't use the deferral mechanism for NFSv4; compounds make it
1288          * too hard to avoid non-idempotency problems.
1289          */
1290         rqstp->rq_usedeferral = false;
1291
1292         /*
1293          * According to RFC3010, this takes precedence over all other errors.
1294          */
1295         status = nfserr_minor_vers_mismatch;
1296         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1297                 goto out;
1298
1299         status = nfs41_check_op_ordering(args);
1300         if (status) {
1301                 op = &args->ops[0];
1302                 op->status = status;
1303                 goto encode_op;
1304         }
1305
1306         while (!status && resp->opcnt < args->opcnt) {
1307                 op = &args->ops[resp->opcnt++];
1308
1309                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1310                         resp->opcnt, args->opcnt, op->opnum,
1311                         nfsd4_op_name(op->opnum));
1312                 /*
1313                  * The XDR decode routines may have pre-set op->status;
1314                  * for example, if there is a miscellaneous XDR error
1315                  * it will be set to nfserr_bad_xdr.
1316                  */
1317                 if (op->status) {
1318                         if (op->opnum == OP_OPEN)
1319                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1320                         goto encode_op;
1321                 }
1322
1323                 opdesc = OPDESC(op);
1324
1325                 if (!current_fh->fh_dentry) {
1326                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1327                                 op->status = nfserr_nofilehandle;
1328                                 goto encode_op;
1329                         }
1330                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1331                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1332                         op->status = nfserr_moved;
1333                         goto encode_op;
1334                 }
1335
1336                 fh_clear_wcc(current_fh);
1337
1338                 /* If op is non-idempotent */
1339                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1340                         /*
1341                          * Don't execute this op if we couldn't encode a
1342                          * succesful reply:
1343                          */
1344                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1345                         /*
1346                          * Plus if there's another operation, make sure
1347                          * we'll have space to at least encode an error:
1348                          */
1349                         if (resp->opcnt < args->opcnt)
1350                                 plen += COMPOUND_ERR_SLACK_SPACE;
1351                         op->status = nfsd4_check_resp_size(resp, plen);
1352                 }
1353
1354                 if (op->status)
1355                         goto encode_op;
1356
1357                 if (opdesc->op_get_currentstateid)
1358                         opdesc->op_get_currentstateid(cstate, &op->u);
1359                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1360
1361                 if (!op->status) {
1362                         if (opdesc->op_set_currentstateid)
1363                                 opdesc->op_set_currentstateid(cstate, &op->u);
1364
1365                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1366                                 clear_current_stateid(cstate);
1367
1368                         if (need_wrongsec_check(rqstp))
1369                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1370                 }
1371
1372 encode_op:
1373                 /* Only from SEQUENCE */
1374                 if (cstate->status == nfserr_replay_cache) {
1375                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1376                         status = op->status;
1377                         goto out;
1378                 }
1379                 if (op->status == nfserr_replay_me) {
1380                         op->replay = &cstate->replay_owner->so_replay;
1381                         nfsd4_encode_replay(&resp->xdr, op);
1382                         status = op->status = op->replay->rp_status;
1383                 } else {
1384                         nfsd4_encode_operation(resp, op);
1385                         status = op->status;
1386                 }
1387
1388                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1389                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1390                         be32_to_cpu(status));
1391
1392                 nfsd4_cstate_clear_replay(cstate);
1393                 /* XXX Ugh, we need to get rid of this kind of special case: */
1394                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1395                         fput(op->u.read.rd_filp);
1396
1397                 nfsd4_increment_op_stats(op->opnum);
1398         }
1399
1400         cstate->status = status;
1401         fh_put(current_fh);
1402         fh_put(save_fh);
1403         BUG_ON(cstate->replay_owner);
1404 out:
1405         /* Reset deferral mechanism for RPC deferrals */
1406         rqstp->rq_usedeferral = true;
1407         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1408         return status;
1409 }
1410
1411 #define op_encode_hdr_size              (2)
1412 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1413 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1414 #define op_encode_change_info_maxsz     (5)
1415 #define nfs4_fattr_bitmap_maxsz         (4)
1416
1417 /* We'll fall back on returning no lockowner if run out of space: */
1418 #define op_encode_lockowner_maxsz       (0)
1419 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1420
1421 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1422
1423 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1424 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1425                                          op_encode_ace_maxsz)
1426
1427 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1428
1429 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1430 {
1431         return (op_encode_hdr_size) * sizeof(__be32);
1432 }
1433
1434 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1435 {
1436         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1437 }
1438
1439 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1440 {
1441         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1442 }
1443
1444 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1445 {
1446         return (op_encode_hdr_size + op_encode_change_info_maxsz
1447                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1448 }
1449
1450 /*
1451  * Note since this is an idempotent operation we won't insist on failing
1452  * the op prematurely if the estimate is too large.  We may turn off splice
1453  * reads unnecessarily.
1454  */
1455 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1456                                       struct nfsd4_op *op)
1457 {
1458         u32 *bmap = op->u.getattr.ga_bmval;
1459         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1460         u32 ret = 0;
1461
1462         if (bmap0 & FATTR4_WORD0_ACL)
1463                 return svc_max_payload(rqstp);
1464         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1465                 return svc_max_payload(rqstp);
1466
1467         if (bmap1 & FATTR4_WORD1_OWNER) {
1468                 ret += IDMAP_NAMESZ + 4;
1469                 bmap1 &= ~FATTR4_WORD1_OWNER;
1470         }
1471         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1472                 ret += IDMAP_NAMESZ + 4;
1473                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1474         }
1475         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1476                 ret += NFS4_FHSIZE + 4;
1477                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1478         }
1479         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1480                 ret += NFSD4_MAX_SEC_LABEL_LEN + 12;
1481                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1482         }
1483         /*
1484          * Largest of remaining attributes are 16 bytes (e.g.,
1485          * supported_attributes)
1486          */
1487         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1488         /* bitmask, length */
1489         ret += 20;
1490         return ret;
1491 }
1492
1493 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1494 {
1495         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1496                 * sizeof(__be32);
1497 }
1498
1499 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1500 {
1501         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1502                 * sizeof(__be32);
1503 }
1504
1505 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1506 {
1507         return (op_encode_hdr_size + op_encode_stateid_maxsz
1508                 + op_encode_change_info_maxsz + 1
1509                 + nfs4_fattr_bitmap_maxsz
1510                 + op_encode_delegation_maxsz) * sizeof(__be32);
1511 }
1512
1513 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1514 {
1515         u32 maxcount = 0, rlen = 0;
1516
1517         maxcount = svc_max_payload(rqstp);
1518         rlen = min(op->u.read.rd_length, maxcount);
1519
1520         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1521 }
1522
1523 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1524 {
1525         u32 maxcount = 0, rlen = 0;
1526
1527         maxcount = svc_max_payload(rqstp);
1528         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1529
1530         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1531                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1532 }
1533
1534 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1535 {
1536         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1537                 * sizeof(__be32);
1538 }
1539
1540 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1541 {
1542         return (op_encode_hdr_size + op_encode_change_info_maxsz
1543                 + op_encode_change_info_maxsz) * sizeof(__be32);
1544 }
1545
1546 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1547                                        struct nfsd4_op *op)
1548 {
1549         return NFS4_MAX_SESSIONID_LEN + 20;
1550 }
1551
1552 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1553 {
1554         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1555 }
1556
1557 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1558 {
1559         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1560                                                                 sizeof(__be32);
1561 }
1562
1563 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1564 {
1565         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1566 }
1567
1568 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1569 {
1570         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1571                 1 + 1 + /* eir_flags, spr_how */\
1572                 4 + /* spo_must_enforce & _allow with bitmap */\
1573                 2 + /*eir_server_owner.so_minor_id */\
1574                 /* eir_server_owner.so_major_id<> */\
1575                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1576                 /* eir_server_scope<> */\
1577                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1578                 1 + /* eir_server_impl_id array length */\
1579                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1580 }
1581
1582 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1583 {
1584         return (op_encode_hdr_size + \
1585                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1586                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1587 }
1588
1589 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1590 {
1591         return (op_encode_hdr_size + \
1592                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1593                 2 + /* csr_sequence, csr_flags */\
1594                 op_encode_channel_attrs_maxsz + \
1595                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1596 }
1597
1598 static struct nfsd4_operation nfsd4_ops[] = {
1599         [OP_ACCESS] = {
1600                 .op_func = (nfsd4op_func)nfsd4_access,
1601                 .op_name = "OP_ACCESS",
1602         },
1603         [OP_CLOSE] = {
1604                 .op_func = (nfsd4op_func)nfsd4_close,
1605                 .op_flags = OP_MODIFIES_SOMETHING,
1606                 .op_name = "OP_CLOSE",
1607                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1608                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1609                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1610         },
1611         [OP_COMMIT] = {
1612                 .op_func = (nfsd4op_func)nfsd4_commit,
1613                 .op_flags = OP_MODIFIES_SOMETHING,
1614                 .op_name = "OP_COMMIT",
1615                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1616         },
1617         [OP_CREATE] = {
1618                 .op_func = (nfsd4op_func)nfsd4_create,
1619                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1620                 .op_name = "OP_CREATE",
1621                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1622         },
1623         [OP_DELEGRETURN] = {
1624                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1625                 .op_flags = OP_MODIFIES_SOMETHING,
1626                 .op_name = "OP_DELEGRETURN",
1627                 .op_rsize_bop = nfsd4_only_status_rsize,
1628                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1629         },
1630         [OP_GETATTR] = {
1631                 .op_func = (nfsd4op_func)nfsd4_getattr,
1632                 .op_flags = ALLOWED_ON_ABSENT_FS,
1633                 .op_rsize_bop = nfsd4_getattr_rsize,
1634                 .op_name = "OP_GETATTR",
1635         },
1636         [OP_GETFH] = {
1637                 .op_func = (nfsd4op_func)nfsd4_getfh,
1638                 .op_name = "OP_GETFH",
1639         },
1640         [OP_LINK] = {
1641                 .op_func = (nfsd4op_func)nfsd4_link,
1642                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1643                                 | OP_CACHEME,
1644                 .op_name = "OP_LINK",
1645                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1646         },
1647         [OP_LOCK] = {
1648                 .op_func = (nfsd4op_func)nfsd4_lock,
1649                 .op_flags = OP_MODIFIES_SOMETHING,
1650                 .op_name = "OP_LOCK",
1651                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1652                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1653         },
1654         [OP_LOCKT] = {
1655                 .op_func = (nfsd4op_func)nfsd4_lockt,
1656                 .op_name = "OP_LOCKT",
1657         },
1658         [OP_LOCKU] = {
1659                 .op_func = (nfsd4op_func)nfsd4_locku,
1660                 .op_flags = OP_MODIFIES_SOMETHING,
1661                 .op_name = "OP_LOCKU",
1662                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1663                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1664         },
1665         [OP_LOOKUP] = {
1666                 .op_func = (nfsd4op_func)nfsd4_lookup,
1667                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1668                 .op_name = "OP_LOOKUP",
1669         },
1670         [OP_LOOKUPP] = {
1671                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1672                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1673                 .op_name = "OP_LOOKUPP",
1674         },
1675         [OP_NVERIFY] = {
1676                 .op_func = (nfsd4op_func)nfsd4_nverify,
1677                 .op_name = "OP_NVERIFY",
1678         },
1679         [OP_OPEN] = {
1680                 .op_func = (nfsd4op_func)nfsd4_open,
1681                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1682                 .op_name = "OP_OPEN",
1683                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1684                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1685         },
1686         [OP_OPEN_CONFIRM] = {
1687                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1688                 .op_flags = OP_MODIFIES_SOMETHING,
1689                 .op_name = "OP_OPEN_CONFIRM",
1690                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1691         },
1692         [OP_OPEN_DOWNGRADE] = {
1693                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1694                 .op_flags = OP_MODIFIES_SOMETHING,
1695                 .op_name = "OP_OPEN_DOWNGRADE",
1696                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1697                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1698                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1699         },
1700         [OP_PUTFH] = {
1701                 .op_func = (nfsd4op_func)nfsd4_putfh,
1702                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1703                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1704                 .op_name = "OP_PUTFH",
1705                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1706         },
1707         [OP_PUTPUBFH] = {
1708                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1709                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1710                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1711                 .op_name = "OP_PUTPUBFH",
1712                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1713         },
1714         [OP_PUTROOTFH] = {
1715                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1716                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1717                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1718                 .op_name = "OP_PUTROOTFH",
1719                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1720         },
1721         [OP_READ] = {
1722                 .op_func = (nfsd4op_func)nfsd4_read,
1723                 .op_name = "OP_READ",
1724                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1725                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1726         },
1727         [OP_READDIR] = {
1728                 .op_func = (nfsd4op_func)nfsd4_readdir,
1729                 .op_name = "OP_READDIR",
1730                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1731         },
1732         [OP_READLINK] = {
1733                 .op_func = (nfsd4op_func)nfsd4_readlink,
1734                 .op_name = "OP_READLINK",
1735         },
1736         [OP_REMOVE] = {
1737                 .op_func = (nfsd4op_func)nfsd4_remove,
1738                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1739                 .op_name = "OP_REMOVE",
1740                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1741         },
1742         [OP_RENAME] = {
1743                 .op_func = (nfsd4op_func)nfsd4_rename,
1744                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1745                 .op_name = "OP_RENAME",
1746                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1747         },
1748         [OP_RENEW] = {
1749                 .op_func = (nfsd4op_func)nfsd4_renew,
1750                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1751                                 | OP_MODIFIES_SOMETHING,
1752                 .op_name = "OP_RENEW",
1753                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1754
1755         },
1756         [OP_RESTOREFH] = {
1757                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1758                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1759                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1760                 .op_name = "OP_RESTOREFH",
1761                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1762         },
1763         [OP_SAVEFH] = {
1764                 .op_func = (nfsd4op_func)nfsd4_savefh,
1765                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1766                 .op_name = "OP_SAVEFH",
1767                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1768         },
1769         [OP_SECINFO] = {
1770                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1771                 .op_flags = OP_HANDLES_WRONGSEC,
1772                 .op_name = "OP_SECINFO",
1773         },
1774         [OP_SETATTR] = {
1775                 .op_func = (nfsd4op_func)nfsd4_setattr,
1776                 .op_name = "OP_SETATTR",
1777                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1778                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1779                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1780         },
1781         [OP_SETCLIENTID] = {
1782                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1783                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1784                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1785                 .op_name = "OP_SETCLIENTID",
1786                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1787         },
1788         [OP_SETCLIENTID_CONFIRM] = {
1789                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1790                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1791                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1792                 .op_name = "OP_SETCLIENTID_CONFIRM",
1793                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1794         },
1795         [OP_VERIFY] = {
1796                 .op_func = (nfsd4op_func)nfsd4_verify,
1797                 .op_name = "OP_VERIFY",
1798         },
1799         [OP_WRITE] = {
1800                 .op_func = (nfsd4op_func)nfsd4_write,
1801                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1802                 .op_name = "OP_WRITE",
1803                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1804                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1805         },
1806         [OP_RELEASE_LOCKOWNER] = {
1807                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1808                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1809                                 | OP_MODIFIES_SOMETHING,
1810                 .op_name = "OP_RELEASE_LOCKOWNER",
1811                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1812         },
1813
1814         /* NFSv4.1 operations */
1815         [OP_EXCHANGE_ID] = {
1816                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1817                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1818                                 | OP_MODIFIES_SOMETHING,
1819                 .op_name = "OP_EXCHANGE_ID",
1820                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1821         },
1822         [OP_BACKCHANNEL_CTL] = {
1823                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1824                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1825                 .op_name = "OP_BACKCHANNEL_CTL",
1826                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1827         },
1828         [OP_BIND_CONN_TO_SESSION] = {
1829                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1830                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1831                                 | OP_MODIFIES_SOMETHING,
1832                 .op_name = "OP_BIND_CONN_TO_SESSION",
1833                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1834         },
1835         [OP_CREATE_SESSION] = {
1836                 .op_func = (nfsd4op_func)nfsd4_create_session,
1837                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1838                                 | OP_MODIFIES_SOMETHING,
1839                 .op_name = "OP_CREATE_SESSION",
1840                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1841         },
1842         [OP_DESTROY_SESSION] = {
1843                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1844                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1845                                 | OP_MODIFIES_SOMETHING,
1846                 .op_name = "OP_DESTROY_SESSION",
1847                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1848         },
1849         [OP_SEQUENCE] = {
1850                 .op_func = (nfsd4op_func)nfsd4_sequence,
1851                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1852                 .op_name = "OP_SEQUENCE",
1853         },
1854         [OP_DESTROY_CLIENTID] = {
1855                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1856                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1857                                 | OP_MODIFIES_SOMETHING,
1858                 .op_name = "OP_DESTROY_CLIENTID",
1859                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1860         },
1861         [OP_RECLAIM_COMPLETE] = {
1862                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1863                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1864                 .op_name = "OP_RECLAIM_COMPLETE",
1865                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1866         },
1867         [OP_SECINFO_NO_NAME] = {
1868                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1869                 .op_flags = OP_HANDLES_WRONGSEC,
1870                 .op_name = "OP_SECINFO_NO_NAME",
1871         },
1872         [OP_TEST_STATEID] = {
1873                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1874                 .op_flags = ALLOWED_WITHOUT_FH,
1875                 .op_name = "OP_TEST_STATEID",
1876         },
1877         [OP_FREE_STATEID] = {
1878                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1879                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1880                 .op_name = "OP_FREE_STATEID",
1881                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1882                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1883         },
1884 };
1885
1886 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
1887 {
1888         struct nfsd4_operation *opdesc;
1889         nfsd4op_rsize estimator;
1890
1891         if (op->opnum == OP_ILLEGAL)
1892                 return op_encode_hdr_size * sizeof(__be32);
1893         opdesc = OPDESC(op);
1894         estimator = opdesc->op_rsize_bop;
1895         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
1896 }
1897
1898 void warn_on_nonidempotent_op(struct nfsd4_op *op)
1899 {
1900         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
1901                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
1902                         op->opnum, nfsd4_op_name(op->opnum));
1903                 WARN_ON_ONCE(1);
1904         }
1905 }
1906
1907 static const char *nfsd4_op_name(unsigned opnum)
1908 {
1909         if (opnum < ARRAY_SIZE(nfsd4_ops))
1910                 return nfsd4_ops[opnum].op_name;
1911         return "unknown_operation";
1912 }
1913
1914 #define nfsd4_voidres                   nfsd4_voidargs
1915 struct nfsd4_voidargs { int dummy; };
1916
1917 static struct svc_procedure             nfsd_procedures4[2] = {
1918         [NFSPROC4_NULL] = {
1919                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1920                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1921                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1922                 .pc_ressize = sizeof(struct nfsd4_voidres),
1923                 .pc_cachetype = RC_NOCACHE,
1924                 .pc_xdrressize = 1,
1925         },
1926         [NFSPROC4_COMPOUND] = {
1927                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1928                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1929                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1930                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1931                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1932                 .pc_release = nfsd4_release_compoundargs,
1933                 .pc_cachetype = RC_NOCACHE,
1934                 .pc_xdrressize = NFSD_BUFSIZE/4,
1935         },
1936 };
1937
1938 struct svc_version      nfsd_version4 = {
1939                 .vs_vers        = 4,
1940                 .vs_nproc       = 2,
1941                 .vs_proc        = nfsd_procedures4,
1942                 .vs_dispatch    = nfsd_dispatch,
1943                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1944                 .vs_rpcb_optnl  = 1,
1945 };
1946
1947 /*
1948  * Local variables:
1949  *  c-basic-offset: 8
1950  * End:
1951  */