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 <[email protected]>
   8  *  Andy Adamson   <[email protected]>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/slab.h>
  37
  38 #include "idmap.h"
  39 #include "cache.h"
  40 #include "xdr4.h"
  41 #include "vfs.h"
  42 #include "current_stateid.h"
  43 #include "netns.h"
  44 #include "acl.h"
  45
  46 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  47 #include <linux/security.h>
  48
  49 static inline void
  50 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  51 {
  52         struct inode *inode = resfh->fh_dentry->d_inode;
  53         int status;
  54
  55         mutex_lock(&inode->i_mutex);
  56         status = security_inode_setsecctx(resfh->fh_dentry,
  57                 label->data, label->len);
  58         mutex_unlock(&inode->i_mutex);
  59
  60         if (status)
  61                 /*
  62                  * XXX: We should really fail the whole open, but we may
  63                  * already have created a new file, so it may be too
  64                  * late.  For now this seems the least of evils:
  65                  */
  66                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  67
  68         return;
  69 }
  70 #else
  71 static inline void
  72 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  73 { }
  74 #endif
  75
  76 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  77
  78 static u32 nfsd_attrmask[] = {
  79         NFSD_WRITEABLE_ATTRS_WORD0,
  80         NFSD_WRITEABLE_ATTRS_WORD1,
  81         NFSD_WRITEABLE_ATTRS_WORD2
  82 };
  83
  84 static u32 nfsd41_ex_attrmask[] = {
  85         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  86         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  87         NFSD_SUPPATTR_EXCLCREAT_WORD2
  88 };
  89
  90 static __be32
  91 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  92                    u32 *bmval, u32 *writable)
  93 {
  94         struct dentry *dentry = cstate->current_fh.fh_dentry;
  95
  96         /*
  97          * Check about attributes are supported by the NFSv4 server or not.
  98          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  99          */
 100         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 101             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 102             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 103                 return nfserr_attrnotsupp;
 104
 105         /*
 106          * Check FATTR4_WORD0_ACL can be supported
 107          * in current environment or not.
 108          */
 109         if (bmval[0] & FATTR4_WORD0_ACL) {
 110                 if (!IS_POSIXACL(dentry->d_inode))
 111                         return nfserr_attrnotsupp;
 112         }
 113
 114         /*
 115          * According to spec, read-only attributes return ERR_INVAL.
 116          */
 117         if (writable) {
 118                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 119                     (bmval[2] & ~writable[2]))
 120                         return nfserr_inval;
 121         }
 122
 123         return nfs_ok;
 124 }
 125
 126 static __be32
 127 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 128         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 129 {
 130         __be32 status = nfs_ok;
 131
 132         if (open->op_create == NFS4_OPEN_CREATE) {
 133                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 134                     || open->op_createmode == NFS4_CREATE_GUARDED)
 135                         status = check_attr_support(rqstp, cstate,
 136                                         open->op_bmval, nfsd_attrmask);
 137                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 138                         status = check_attr_support(rqstp, cstate,
 139                                         open->op_bmval, nfsd41_ex_attrmask);
 140         }
 141
 142         return status;
 143 }
 144
 145 static int
 146 is_create_with_attrs(struct nfsd4_open *open)
 147 {
 148         return open->op_create == NFS4_OPEN_CREATE
 149                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 150                     || open->op_createmode == NFS4_CREATE_GUARDED
 151                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 152 }
 153
 154 /*
 155  * if error occurs when setting the acl, just clear the acl bit
 156  * in the returned attr bitmap.
 157  */
 158 static void
 159 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 160                 struct nfs4_acl *acl, u32 *bmval)
 161 {
 162         __be32 status;
 163
 164         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 165         if (status)
 166                 /*
 167                  * We should probably fail the whole open at this point,
 168                  * but we've already created the file, so it's too late;
 169                  * So this seems the least of evils:
 170                  */
 171                 bmval[0] &= ~FATTR4_WORD0_ACL;
 172 }
 173
 174 static inline void
 175 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 176 {
 177         fh_put(dst);
 178         dget(src->fh_dentry);
 179         if (src->fh_export)
 180                 cache_get(&src->fh_export->h);
 181         *dst = *src;
 182 }
 183
 184 static __be32
 185 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 186 {
 187         __be32 status;
 188
 189         if (open->op_truncate &&
 190                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 191                 return nfserr_inval;
 192
 193         accmode |= NFSD_MAY_READ_IF_EXEC;
 194
 195         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 196                 accmode |= NFSD_MAY_READ;
 197         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 198                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 199         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 200                 accmode |= NFSD_MAY_WRITE;
 201
 202         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 203
 204         return status;
 205 }
 206
 207 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 208 {
 209         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 210
 211         if (S_ISREG(mode))
 212                 return nfs_ok;
 213         if (S_ISDIR(mode))
 214                 return nfserr_isdir;
 215         /*
 216          * Using err_symlink as our catch-all case may look odd; but
 217          * there's no other obvious error for this case in 4.0, and we
 218          * happen to know that it will cause the linux v4 client to do
 219          * the right thing on attempts to open something other than a
 220          * regular file.
 221          */
 222         return nfserr_symlink;
 223 }
 224
 225 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 226 {
 227         if (nfsd4_has_session(cstate))
 228                 return;
 229         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 230                         &resfh->fh_handle);
 231 }
 232
 233 static __be32
 234 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 235 {
 236         struct svc_fh *current_fh = &cstate->current_fh;
 237         int accmode;
 238         __be32 status;
 239
 240         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 241         if (!*resfh)
 242                 return nfserr_jukebox;
 243         fh_init(*resfh, NFS4_FHSIZE);
 244         open->op_truncate = 0;
 245
 246         if (open->op_create) {
 247                 /* FIXME: check session persistence and pnfs flags.
 248                  * The nfsv4.1 spec requires the following semantics:
 249                  *
 250                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 251                  * Reply Cache  | server |                 |
 252                  * -------------+--------+-----------------+--------------------
 253                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 254                  *              |        |                 | (SHOULD)
 255                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 256                  *              |        |                 | (SHOULD NOT)
 257                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 258                  * yes          | no     | GUARDED4        | GUARDED4
 259                  * yes          | yes    | GUARDED4        | GUARDED4
 260                  */
 261
 262                 /*
 263                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 264                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 265                  */
 266                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 267                                         open->op_fname.len, &open->op_iattr,
 268                                         *resfh, open->op_createmode,
 269                                         (u32 *)open->op_verf.data,
 270                                         &open->op_truncate, &open->op_created);
 271
 272                 if (!status && open->op_label.len)
 273                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 274
 275                 /*
 276                  * Following rfc 3530 14.2.16, use the returned bitmask
 277                  * to indicate which attributes we used to store the
 278                  * verifier:
 279                  */
 280                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 281                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 282                                                         FATTR4_WORD1_TIME_MODIFY);
 283         } else
 284                 /*
 285                  * Note this may exit with the parent still locked.
 286                  * We will hold the lock until nfsd4_open's final
 287                  * lookup, to prevent renames or unlinks until we've had
 288                  * a chance to an acquire a delegation if appropriate.
 289                  */
 290                 status = nfsd_lookup(rqstp, current_fh,
 291                                      open->op_fname.data, open->op_fname.len, *resfh);
 292         if (status)
 293                 goto out;
 294         status = nfsd_check_obj_isreg(*resfh);
 295         if (status)
 296                 goto out;
 297
 298         if (is_create_with_attrs(open) && open->op_acl != NULL)
 299                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 300
 301         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 302         accmode = NFSD_MAY_NOP;
 303         if (open->op_created ||
 304                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 305                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 306         status = do_open_permission(rqstp, *resfh, open, accmode);
 307         set_change_info(&open->op_cinfo, current_fh);
 308 out:
 309         return status;
 310 }
 311
 312 static __be32
 313 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 314 {
 315         struct svc_fh *current_fh = &cstate->current_fh;
 316         __be32 status;
 317         int accmode = 0;
 318
 319         /* We don't know the target directory, and therefore can not
 320         * set the change info
 321         */
 322
 323         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 324
 325         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 326
 327         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 328                 (open->op_iattr.ia_size == 0);
 329         /*
 330          * In the delegation case, the client is telling us about an
 331          * open that it *already* performed locally, some time ago.  We
 332          * should let it succeed now if possible.
 333          *
 334          * In the case of a CLAIM_FH open, on the other hand, the client
 335          * may be counting on us to enforce permissions (the Linux 4.1
 336          * client uses this for normal opens, for example).
 337          */
 338         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 339                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 340
 341         status = do_open_permission(rqstp, current_fh, open, accmode);
 342
 343         return status;
 344 }
 345
 346 static void
 347 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 348 {
 349         struct nfsd4_sessionid *sid =
 350                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 351
 352         clid->cl_boot = sid->clientid.cl_boot;
 353         clid->cl_id = sid->clientid.cl_id;
 354 }
 355
 356 static __be32
 357 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 358            struct nfsd4_open *open)
 359 {
 360         __be32 status;
 361         struct svc_fh *resfh = NULL;
 362         struct nfsd4_compoundres *resp;
 363         struct net *net = SVC_NET(rqstp);
 364         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 365
 366         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 367                 (int)open->op_fname.len, open->op_fname.data,
 368                 open->op_openowner);
 369
 370         /* This check required by spec. */
 371         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 372                 return nfserr_inval;
 373
 374         open->op_created = 0;
 375         /*
 376          * RFC5661 18.51.3
 377          * Before RECLAIM_COMPLETE done, server should deny new lock
 378          */
 379         if (nfsd4_has_session(cstate) &&
 380             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 381                       &cstate->session->se_client->cl_flags) &&
 382             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 383                 return nfserr_grace;
 384
 385         if (nfsd4_has_session(cstate))
 386                 copy_clientid(&open->op_clientid, cstate->session);
 387
 388         nfs4_lock_state();
 389
 390         /* check seqid for replay. set nfs4_owner */
 391         resp = rqstp->rq_resp;
 392         status = nfsd4_process_open1(&resp->cstate, open, nn);
 393         if (status == nfserr_replay_me) {
 394                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 395                 fh_put(&cstate->current_fh);
 396                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 397                                 &rp->rp_openfh);
 398                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 399                 if (status)
 400                         dprintk("nfsd4_open: replay failed"
 401                                 " restoring previous filehandle\n");
 402                 else
 403                         status = nfserr_replay_me;
 404         }
 405         if (status)
 406                 goto out;
 407         if (open->op_xdr_error) {
 408                 status = open->op_xdr_error;
 409                 goto out;
 410         }
 411
 412         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 413         if (status)
 414                 goto out;
 415
 416         /* Openowner is now set, so sequence id will get bumped.  Now we need
 417          * these checks before we do any creates: */
 418         status = nfserr_grace;
 419         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 420                 goto out;
 421         status = nfserr_no_grace;
 422         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 423                 goto out;
 424
 425         switch (open->op_claim_type) {
 426                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 427                 case NFS4_OPEN_CLAIM_NULL:
 428                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 429                         if (status)
 430                                 goto out;
 431                         break;
 432                 case NFS4_OPEN_CLAIM_PREVIOUS:
 433                         status = nfs4_check_open_reclaim(&open->op_clientid,
 434                                                          cstate->minorversion,
 435                                                          nn);
 436                         if (status)
 437                                 goto out;
 438                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 439                 case NFS4_OPEN_CLAIM_FH:
 440                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 441                         status = do_open_fhandle(rqstp, cstate, open);
 442                         if (status)
 443                                 goto out;
 444                         resfh = &cstate->current_fh;
 445                         break;
 446                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 447                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 448                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 449                                 open->op_claim_type);
 450                         status = nfserr_notsupp;
 451                         goto out;
 452                 default:
 453                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 454                                 open->op_claim_type);
 455                         status = nfserr_inval;
 456                         goto out;
 457         }
 458         /*
 459          * nfsd4_process_open2() does the actual opening of the file.  If
 460          * successful, it (1) truncates the file if open->op_truncate was
 461          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 462          */
 463         status = nfsd4_process_open2(rqstp, resfh, open);
 464         WARN_ON(status && open->op_created);
 465 out:
 466         if (resfh && resfh != &cstate->current_fh) {
 467                 fh_dup2(&cstate->current_fh, resfh);
 468                 fh_put(resfh);
 469                 kfree(resfh);
 470         }
 471         nfsd4_cleanup_open_state(open, status);
 472         if (open->op_openowner && !nfsd4_has_session(cstate))
 473                 cstate->replay_owner = &open->op_openowner->oo_owner;
 474         nfsd4_bump_seqid(cstate, status);
 475         if (!cstate->replay_owner)
 476                 nfs4_unlock_state();
 477         return status;
 478 }
 479
 480 /*
 481  * OPEN is the only seqid-mutating operation whose decoding can fail
 482  * with a seqid-mutating error (specifically, decoding of user names in
 483  * the attributes).  Therefore we have to do some processing to look up
 484  * the stateowner so that we can bump the seqid.
 485  */
 486 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 487 {
 488         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 489
 490         if (!seqid_mutating_err(ntohl(op->status)))
 491                 return op->status;
 492         if (nfsd4_has_session(cstate))
 493                 return op->status;
 494         open->op_xdr_error = op->status;
 495         return nfsd4_open(rqstp, cstate, open);
 496 }
 497
 498 /*
 499  * filehandle-manipulating ops.
 500  */
 501 static __be32
 502 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 503             struct svc_fh **getfh)
 504 {
 505         if (!cstate->current_fh.fh_dentry)
 506                 return nfserr_nofilehandle;
 507
 508         *getfh = &cstate->current_fh;
 509         return nfs_ok;
 510 }
 511
 512 static __be32
 513 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 514             struct nfsd4_putfh *putfh)
 515 {
 516         fh_put(&cstate->current_fh);
 517         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 518         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 519                putfh->pf_fhlen);
 520         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 521 }
 522
 523 static __be32
 524 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 525                 void *arg)
 526 {
 527         __be32 status;
 528
 529         fh_put(&cstate->current_fh);
 530         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 531         return status;
 532 }
 533
 534 static __be32
 535 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 536                 void *arg)
 537 {
 538         if (!cstate->save_fh.fh_dentry)
 539                 return nfserr_restorefh;
 540
 541         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 542         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 543                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 544                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 545         }
 546         return nfs_ok;
 547 }
 548
 549 static __be32
 550 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 551              void *arg)
 552 {
 553         if (!cstate->current_fh.fh_dentry)
 554                 return nfserr_nofilehandle;
 555
 556         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 557         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 558                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 559                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 560         }
 561         return nfs_ok;
 562 }
 563
 564 /*
 565  * misc nfsv4 ops
 566  */
 567 static __be32
 568 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 569              struct nfsd4_access *access)
 570 {
 571         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 572                 return nfserr_inval;
 573
 574         access->ac_resp_access = access->ac_req_access;
 575         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 576                            &access->ac_supported);
 577 }
 578
 579 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 580 {
 581         __be32 verf[2];
 582         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 583
 584         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 585         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 586         memcpy(verifier->data, verf, sizeof(verifier->data));
 587 }
 588
 589 static __be32
 590 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 591              struct nfsd4_commit *commit)
 592 {
 593         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 594         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 595                              commit->co_count);
 596 }
 597
 598 static __be32
 599 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600              struct nfsd4_create *create)
 601 {
 602         struct svc_fh resfh;
 603         __be32 status;
 604         dev_t rdev;
 605
 606         fh_init(&resfh, NFS4_FHSIZE);
 607
 608         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 609                            NFSD_MAY_CREATE);
 610         if (status)
 611                 return status;
 612
 613         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 614                                     nfsd_attrmask);
 615         if (status)
 616                 return status;
 617
 618         switch (create->cr_type) {
 619         case NF4LNK:
 620                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 621                                       create->cr_name, create->cr_namelen,
 622                                       create->cr_linkname, create->cr_linklen,
 623                                       &resfh, &create->cr_iattr);
 624                 break;
 625
 626         case NF4BLK:
 627                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 628                 if (MAJOR(rdev) != create->cr_specdata1 ||
 629                     MINOR(rdev) != create->cr_specdata2)
 630                         return nfserr_inval;
 631                 status = nfsd_create(rqstp, &cstate->current_fh,
 632                                      create->cr_name, create->cr_namelen,
 633                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 634                 break;
 635
 636         case NF4CHR:
 637                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 638                 if (MAJOR(rdev) != create->cr_specdata1 ||
 639                     MINOR(rdev) != create->cr_specdata2)
 640                         return nfserr_inval;
 641                 status = nfsd_create(rqstp, &cstate->current_fh,
 642                                      create->cr_name, create->cr_namelen,
 643                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 644                 break;
 645
 646         case NF4SOCK:
 647                 status = nfsd_create(rqstp, &cstate->current_fh,
 648                                      create->cr_name, create->cr_namelen,
 649                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 650                 break;
 651
 652         case NF4FIFO:
 653                 status = nfsd_create(rqstp, &cstate->current_fh,
 654                                      create->cr_name, create->cr_namelen,
 655                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 656                 break;
 657
 658         case NF4DIR:
 659                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 660                 status = nfsd_create(rqstp, &cstate->current_fh,
 661                                      create->cr_name, create->cr_namelen,
 662                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 663                 break;
 664
 665         default:
 666                 status = nfserr_badtype;
 667         }
 668
 669         if (status)
 670                 goto out;
 671
 672         if (create->cr_label.len)
 673                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 674
 675         if (create->cr_acl != NULL)
 676                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 677                                 create->cr_bmval);
 678
 679         fh_unlock(&cstate->current_fh);
 680         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 681         fh_dup2(&cstate->current_fh, &resfh);
 682 out:
 683         fh_put(&resfh);
 684         return status;
 685 }
 686
 687 static __be32
 688 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 689               struct nfsd4_getattr *getattr)
 690 {
 691         __be32 status;
 692
 693         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 694         if (status)
 695                 return status;
 696
 697         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 698                 return nfserr_inval;
 699
 700         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 701         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 702         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 703
 704         getattr->ga_fhp = &cstate->current_fh;
 705         return nfs_ok;
 706 }
 707
 708 static __be32
 709 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 710            struct nfsd4_link *link)
 711 {
 712         __be32 status = nfserr_nofilehandle;
 713
 714         if (!cstate->save_fh.fh_dentry)
 715                 return status;
 716         status = nfsd_link(rqstp, &cstate->current_fh,
 717                            link->li_name, link->li_namelen, &cstate->save_fh);
 718         if (!status)
 719                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 720         return status;
 721 }
 722
 723 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 724 {
 725         struct svc_fh tmp_fh;
 726         __be32 ret;
 727
 728         fh_init(&tmp_fh, NFS4_FHSIZE);
 729         ret = exp_pseudoroot(rqstp, &tmp_fh);
 730         if (ret)
 731                 return ret;
 732         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 733                 fh_put(&tmp_fh);
 734                 return nfserr_noent;
 735         }
 736         fh_put(&tmp_fh);
 737         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 738 }
 739
 740 static __be32
 741 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 742               void *arg)
 743 {
 744         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 745 }
 746
 747 static __be32
 748 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 749              struct nfsd4_lookup *lookup)
 750 {
 751         return nfsd_lookup(rqstp, &cstate->current_fh,
 752                            lookup->lo_name, lookup->lo_len,
 753                            &cstate->current_fh);
 754 }
 755
 756 static __be32
 757 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 758            struct nfsd4_read *read)
 759 {
 760         __be32 status;
 761
 762         /* no need to check permission - this will be done in nfsd_read() */
 763
 764         read->rd_filp = NULL;
 765         if (read->rd_offset >= OFFSET_MAX)
 766                 return nfserr_inval;
 767
 768         /*
 769          * If we do a zero copy read, then a client will see read data
 770          * that reflects the state of the file *after* performing the
 771          * following compound.
 772          *
 773          * To ensure proper ordering, we therefore turn off zero copy if
 774          * the client wants us to do more in this compound:
 775          */
 776         if (!nfsd4_last_compound_op(rqstp))
 777                 rqstp->rq_splice_ok = false;
 778
 779         /* check stateid */
 780         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 781                                                  cstate, &read->rd_stateid,
 782                                                  RD_STATE, &read->rd_filp))) {
 783                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 784                 goto out;
 785         }
 786         status = nfs_ok;
 787 out:
 788         read->rd_rqstp = rqstp;
 789         read->rd_fhp = &cstate->current_fh;
 790         return status;
 791 }
 792
 793 static __be32
 794 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 795               struct nfsd4_readdir *readdir)
 796 {
 797         u64 cookie = readdir->rd_cookie;
 798         static const nfs4_verifier zeroverf;
 799
 800         /* no need to check permission - this will be done in nfsd_readdir() */
 801
 802         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 803                 return nfserr_inval;
 804
 805         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 806         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 807         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 808
 809         if ((cookie == 1) || (cookie == 2) ||
 810             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 811                 return nfserr_bad_cookie;
 812
 813         readdir->rd_rqstp = rqstp;
 814         readdir->rd_fhp = &cstate->current_fh;
 815         return nfs_ok;
 816 }
 817
 818 static __be32
 819 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 820                struct nfsd4_readlink *readlink)
 821 {
 822         readlink->rl_rqstp = rqstp;
 823         readlink->rl_fhp = &cstate->current_fh;
 824         return nfs_ok;
 825 }
 826
 827 static __be32
 828 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 829              struct nfsd4_remove *remove)
 830 {
 831         __be32 status;
 832
 833         if (locks_in_grace(SVC_NET(rqstp)))
 834                 return nfserr_grace;
 835         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 836                              remove->rm_name, remove->rm_namelen);
 837         if (!status) {
 838                 fh_unlock(&cstate->current_fh);
 839                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 840         }
 841         return status;
 842 }
 843
 844 static __be32
 845 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 846              struct nfsd4_rename *rename)
 847 {
 848         __be32 status = nfserr_nofilehandle;
 849
 850         if (!cstate->save_fh.fh_dentry)
 851                 return status;
 852         if (locks_in_grace(SVC_NET(rqstp)) &&
 853                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 854                 return nfserr_grace;
 855         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 856                              rename->rn_snamelen, &cstate->current_fh,
 857                              rename->rn_tname, rename->rn_tnamelen);
 858         if (status)
 859                 return status;
 860         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 861         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 862         return nfs_ok;
 863 }
 864
 865 static __be32
 866 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 867               struct nfsd4_secinfo *secinfo)
 868 {
 869         struct svc_fh resfh;
 870         struct svc_export *exp;
 871         struct dentry *dentry;
 872         __be32 err;
 873
 874         fh_init(&resfh, NFS4_FHSIZE);
 875         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 876         if (err)
 877                 return err;
 878         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 879                                     secinfo->si_name, secinfo->si_namelen,
 880                                     &exp, &dentry);
 881         if (err)
 882                 return err;
 883         if (dentry->d_inode == NULL) {
 884                 exp_put(exp);
 885                 err = nfserr_noent;
 886         } else
 887                 secinfo->si_exp = exp;
 888         dput(dentry);
 889         if (cstate->minorversion)
 890                 /* See rfc 5661 section 2.6.3.1.1.8 */
 891                 fh_put(&cstate->current_fh);
 892         return err;
 893 }
 894
 895 static __be32
 896 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 897               struct nfsd4_secinfo_no_name *sin)
 898 {
 899         __be32 err;
 900
 901         switch (sin->sin_style) {
 902         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 903                 break;
 904         case NFS4_SECINFO_STYLE4_PARENT:
 905                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 906                 if (err)
 907                         return err;
 908                 break;
 909         default:
 910                 return nfserr_inval;
 911         }
 912         exp_get(cstate->current_fh.fh_export);
 913         sin->sin_exp = cstate->current_fh.fh_export;
 914         fh_put(&cstate->current_fh);
 915         return nfs_ok;
 916 }
 917
 918 static __be32
 919 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 920               struct nfsd4_setattr *setattr)
 921 {
 922         __be32 status = nfs_ok;
 923         int err;
 924
 925         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 926                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 927                         &setattr->sa_stateid, WR_STATE, NULL);
 928                 if (status) {
 929                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 930                         return status;
 931                 }
 932         }
 933         err = fh_want_write(&cstate->current_fh);
 934         if (err)
 935                 return nfserrno(err);
 936         status = nfs_ok;
 937
 938         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 939                                     nfsd_attrmask);
 940         if (status)
 941                 goto out;
 942
 943         if (setattr->sa_acl != NULL)
 944                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 945                                             setattr->sa_acl);
 946         if (status)
 947                 goto out;
 948         if (setattr->sa_label.len)
 949                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 950                                 &setattr->sa_label);
 951         if (status)
 952                 goto out;
 953         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 954                                 0, (time_t)0);
 955 out:
 956         fh_drop_write(&cstate->current_fh);
 957         return status;
 958 }
 959
 960 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 961 {
 962         int i = 1;
 963         int buflen = write->wr_buflen;
 964
 965         vec[0].iov_base = write->wr_head.iov_base;
 966         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 967         buflen -= vec[0].iov_len;
 968
 969         while (buflen) {
 970                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 971                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 972                 buflen -= vec[i].iov_len;
 973                 i++;
 974         }
 975         return i;
 976 }
 977
 978 static __be32
 979 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 980             struct nfsd4_write *write)
 981 {
 982         stateid_t *stateid = &write->wr_stateid;
 983         struct file *filp = NULL;
 984         __be32 status = nfs_ok;
 985         unsigned long cnt;
 986         int nvecs;
 987
 988         /* no need to check permission - this will be done in nfsd_write() */
 989
 990         if (write->wr_offset >= OFFSET_MAX)
 991                 return nfserr_inval;
 992
 993         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 994                                         cstate, stateid, WR_STATE, &filp);
 995         if (status) {
 996                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 997                 return status;
 998         }
 999
1000         cnt = write->wr_buflen;
1001         write->wr_how_written = write->wr_stable_how;
1002         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1003
1004         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1005         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1006
1007         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1008                              write->wr_offset, rqstp->rq_vec, nvecs,
1009                              &cnt, &write->wr_how_written);
1010         if (filp)
1011                 fput(filp);
1012
1013         write->wr_bytes_written = cnt;
1014
1015         return status;
1016 }
1017
1018 /* This routine never returns NFS_OK!  If there are no other errors, it
1019  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1020  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1021  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1022  */
1023 static __be32
1024 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1025              struct nfsd4_verify *verify)
1026 {
1027         __be32 *buf, *p;
1028         int count;
1029         __be32 status;
1030
1031         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1032         if (status)
1033                 return status;
1034
1035         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1036         if (status)
1037                 return status;
1038
1039         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1040             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1041                 return nfserr_inval;
1042         if (verify->ve_attrlen & 3)
1043                 return nfserr_inval;
1044
1045         /* count in words:
1046          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1047          */
1048         count = 4 + (verify->ve_attrlen >> 2);
1049         buf = kmalloc(count << 2, GFP_KERNEL);
1050         if (!buf)
1051                 return nfserr_jukebox;
1052
1053         p = buf;
1054         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1055                                     cstate->current_fh.fh_export,
1056                                     cstate->current_fh.fh_dentry,
1057                                     verify->ve_bmval,
1058                                     rqstp, 0);
1059         /*
1060          * If nfsd4_encode_fattr() ran out of space, assume that's because
1061          * the attributes are longer (hence different) than those given:
1062          */
1063         if (status == nfserr_resource)
1064                 status = nfserr_not_same;
1065         if (status)
1066                 goto out_kfree;
1067
1068         /* skip bitmap */
1069         p = buf + 1 + ntohl(buf[0]);
1070         status = nfserr_not_same;
1071         if (ntohl(*p++) != verify->ve_attrlen)
1072                 goto out_kfree;
1073         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1074                 status = nfserr_same;
1075
1076 out_kfree:
1077         kfree(buf);
1078         return status;
1079 }
1080
1081 static __be32
1082 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1083               struct nfsd4_verify *verify)
1084 {
1085         __be32 status;
1086
1087         status = _nfsd4_verify(rqstp, cstate, verify);
1088         return status == nfserr_not_same ? nfs_ok : status;
1089 }
1090
1091 static __be32
1092 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1093              struct nfsd4_verify *verify)
1094 {
1095         __be32 status;
1096
1097         status = _nfsd4_verify(rqstp, cstate, verify);
1098         return status == nfserr_same ? nfs_ok : status;
1099 }
1100
1101 /*
1102  * NULL call.
1103  */
1104 static __be32
1105 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1106 {
1107         return nfs_ok;
1108 }
1109
1110 static inline void nfsd4_increment_op_stats(u32 opnum)
1111 {
1112         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1113                 nfsdstats.nfs4_opcount[opnum]++;
1114 }
1115
1116 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1117                               void *);
1118 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1119 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1120 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1121
1122 enum nfsd4_op_flags {
1123         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1124         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1125         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1126         /* For rfc 5661 section 2.6.3.1.1: */
1127         OP_HANDLES_WRONGSEC = 1 << 3,
1128         OP_IS_PUTFH_LIKE = 1 << 4,
1129         /*
1130          * These are the ops whose result size we estimate before
1131          * encoding, to avoid performing an op then not being able to
1132          * respond or cache a response.  This includes writes and setattrs
1133          * as well as the operations usually called "nonidempotent":
1134          */
1135         OP_MODIFIES_SOMETHING = 1 << 5,
1136         /*
1137          * Cache compounds containing these ops in the xid-based drc:
1138          * We use the DRC for compounds containing non-idempotent
1139          * operations, *except* those that are 4.1-specific (since
1140          * sessions provide their own EOS), and except for stateful
1141          * operations other than setclientid and setclientid_confirm
1142          * (since sequence numbers provide EOS for open, lock, etc in
1143          * the v4.0 case).
1144          */
1145         OP_CACHEME = 1 << 6,
1146         /*
1147          * These are ops which clear current state id.
1148          */
1149         OP_CLEAR_STATEID = 1 << 7,
1150 };
1151
1152 struct nfsd4_operation {
1153         nfsd4op_func op_func;
1154         u32 op_flags;
1155         char *op_name;
1156         /* Try to get response size before operation */
1157         nfsd4op_rsize op_rsize_bop;
1158         stateid_getter op_get_currentstateid;
1159         stateid_setter op_set_currentstateid;
1160 };
1161
1162 static struct nfsd4_operation nfsd4_ops[];
1163
1164 static const char *nfsd4_op_name(unsigned opnum);
1165
1166 /*
1167  * Enforce NFSv4.1 COMPOUND ordering rules:
1168  *
1169  * Also note, enforced elsewhere:
1170  *      - SEQUENCE other than as first op results in
1171  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1172  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1173  *        (Enforced in nfsd4_bind_conn_to_session().)
1174  *      - DESTROY_SESSION must be the final operation in a compound, if
1175  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1176  *        (Enforced in nfsd4_destroy_session().)
1177  */
1178 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1179 {
1180         struct nfsd4_op *op = &args->ops[0];
1181
1182         /* These ordering requirements don't apply to NFSv4.0: */
1183         if (args->minorversion == 0)
1184                 return nfs_ok;
1185         /* This is weird, but OK, not our problem: */
1186         if (args->opcnt == 0)
1187                 return nfs_ok;
1188         if (op->status == nfserr_op_illegal)
1189                 return nfs_ok;
1190         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1191                 return nfserr_op_not_in_session;
1192         if (op->opnum == OP_SEQUENCE)
1193                 return nfs_ok;
1194         if (args->opcnt != 1)
1195                 return nfserr_not_only_op;
1196         return nfs_ok;
1197 }
1198
1199 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1200 {
1201         return &nfsd4_ops[op->opnum];
1202 }
1203
1204 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1205 {
1206         if (op->opnum == OP_ILLEGAL)
1207                 return false;
1208         return OPDESC(op)->op_flags & OP_CACHEME;
1209 }
1210
1211 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1212 {
1213         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1214         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1215         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1216         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1217         struct nfsd4_operation *thisd;
1218         struct nfsd4_operation *nextd;
1219
1220         thisd = OPDESC(this);
1221         /*
1222          * Most ops check wronsec on our own; only the putfh-like ops
1223          * have special rules.
1224          */
1225         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1226                 return false;
1227         /*
1228          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1229          * put-filehandle operation if we're not going to use the
1230          * result:
1231          */
1232         if (argp->opcnt == resp->opcnt)
1233                 return false;
1234
1235         nextd = OPDESC(next);
1236         /*
1237          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1238          * errors themselves as necessary; others should check for them
1239          * now:
1240          */
1241         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1242 }
1243
1244 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1245                                struct nfsd4_compoundres *resp)
1246 {
1247         struct xdr_stream *xdr = &resp->xdr;
1248         struct xdr_buf *buf = &rqstp->rq_res;
1249         struct kvec *head = buf->head;
1250
1251         xdr->buf = buf;
1252         xdr->iov = head;
1253         xdr->p   = head->iov_base + head->iov_len;
1254         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1255         /* Tail and page_len should be zero at this point: */
1256         buf->len = buf->head[0].iov_len;
1257         xdr->scratch.iov_len = 0;
1258         xdr->page_ptr = buf->pages - 1;
1259         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1260                 - rqstp->rq_auth_slack;
1261 }
1262
1263 /*
1264  * COMPOUND call.
1265  */
1266 static __be32
1267 nfsd4_proc_compound(struct svc_rqst *rqstp,
1268                     struct nfsd4_compoundargs *args,
1269                     struct nfsd4_compoundres *resp)
1270 {
1271         struct nfsd4_op *op;
1272         struct nfsd4_operation *opdesc;
1273         struct nfsd4_compound_state *cstate = &resp->cstate;
1274         struct svc_fh *current_fh = &cstate->current_fh;
1275         struct svc_fh *save_fh = &cstate->save_fh;
1276         __be32          status;
1277
1278         svcxdr_init_encode(rqstp, resp);
1279         resp->tagp = resp->xdr.p;
1280         /* reserve space for: taglen, tag, and opcnt */
1281         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1282         resp->taglen = args->taglen;
1283         resp->tag = args->tag;
1284         resp->rqstp = rqstp;
1285         cstate->minorversion = args->minorversion;
1286         fh_init(current_fh, NFS4_FHSIZE);
1287         fh_init(save_fh, NFS4_FHSIZE);
1288         /*
1289          * Don't use the deferral mechanism for NFSv4; compounds make it
1290          * too hard to avoid non-idempotency problems.
1291          */
1292         rqstp->rq_usedeferral = 0;
1293
1294         /*
1295          * According to RFC3010, this takes precedence over all other errors.
1296          */
1297         status = nfserr_minor_vers_mismatch;
1298         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1299                 goto out;
1300
1301         status = nfs41_check_op_ordering(args);
1302         if (status) {
1303                 op = &args->ops[0];
1304                 op->status = status;
1305                 goto encode_op;
1306         }
1307
1308         while (!status && resp->opcnt < args->opcnt) {
1309                 op = &args->ops[resp->opcnt++];
1310
1311                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1312                         resp->opcnt, args->opcnt, op->opnum,
1313                         nfsd4_op_name(op->opnum));
1314                 /*
1315                  * The XDR decode routines may have pre-set op->status;
1316                  * for example, if there is a miscellaneous XDR error
1317                  * it will be set to nfserr_bad_xdr.
1318                  */
1319                 if (op->status) {
1320                         if (op->opnum == OP_OPEN)
1321                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1322                         goto encode_op;
1323                 }
1324
1325                 opdesc = OPDESC(op);
1326
1327                 if (!current_fh->fh_dentry) {
1328                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1329                                 op->status = nfserr_nofilehandle;
1330                                 goto encode_op;
1331                         }
1332                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1333                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1334                         op->status = nfserr_moved;
1335                         goto encode_op;
1336                 }
1337
1338                 fh_clear_wcc(current_fh);
1339
1340                 /* If op is non-idempotent */
1341                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1342                         /*
1343                          * Don't execute this op if we couldn't encode a
1344                          * succesful reply:
1345                          */
1346                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1347                         /*
1348                          * Plus if there's another operation, make sure
1349                          * we'll have space to at least encode an error:
1350                          */
1351                         if (resp->opcnt < args->opcnt)
1352                                 plen += COMPOUND_ERR_SLACK_SPACE;
1353                         op->status = nfsd4_check_resp_size(resp, plen);
1354                 }
1355
1356                 if (op->status)
1357                         goto encode_op;
1358
1359                 if (opdesc->op_get_currentstateid)
1360                         opdesc->op_get_currentstateid(cstate, &op->u);
1361                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1362
1363                 if (!op->status) {
1364                         if (opdesc->op_set_currentstateid)
1365                                 opdesc->op_set_currentstateid(cstate, &op->u);
1366
1367                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1368                                 clear_current_stateid(cstate);
1369
1370                         if (need_wrongsec_check(rqstp))
1371                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1372                 }
1373
1374 encode_op:
1375                 /* Only from SEQUENCE */
1376                 if (cstate->status == nfserr_replay_cache) {
1377                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1378                         status = op->status;
1379                         goto out;
1380                 }
1381                 if (op->status == nfserr_replay_me) {
1382                         op->replay = &cstate->replay_owner->so_replay;
1383                         nfsd4_encode_replay(&resp->xdr, op);
1384                         status = op->status = op->replay->rp_status;
1385                 } else {
1386                         nfsd4_encode_operation(resp, op);
1387                         status = op->status;
1388                 }
1389
1390                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1391                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1392                         be32_to_cpu(status));
1393
1394                 if (cstate->replay_owner) {
1395                         nfs4_unlock_state();
1396                         cstate->replay_owner = NULL;
1397                 }
1398                 /* XXX Ugh, we need to get rid of this kind of special case: */
1399                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1400                         fput(op->u.read.rd_filp);
1401
1402                 nfsd4_increment_op_stats(op->opnum);
1403         }
1404
1405         cstate->status = status;
1406         fh_put(current_fh);
1407         fh_put(save_fh);
1408         BUG_ON(cstate->replay_owner);
1409 out:
1410         /* Reset deferral mechanism for RPC deferrals */
1411         rqstp->rq_usedeferral = 1;
1412         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1413         return status;
1414 }
1415
1416 #define op_encode_hdr_size              (2)
1417 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1418 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1419 #define op_encode_change_info_maxsz     (5)
1420 #define nfs4_fattr_bitmap_maxsz         (4)
1421
1422 /* We'll fall back on returning no lockowner if run out of space: */
1423 #define op_encode_lockowner_maxsz       (0)
1424 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1425
1426 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1427
1428 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1429 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1430                                          op_encode_ace_maxsz)
1431
1432 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1433
1434 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1435 {
1436         return (op_encode_hdr_size) * sizeof(__be32);
1437 }
1438
1439 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1440 {
1441         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1442 }
1443
1444 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1445 {
1446         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1447 }
1448
1449 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1450 {
1451         return (op_encode_hdr_size + op_encode_change_info_maxsz
1452                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1453 }
1454
1455 /*
1456  * Note since this is an idempotent operation we won't insist on failing
1457  * the op prematurely if the estimate is too large.  We may turn off splice
1458  * reads unnecessarily.
1459  */
1460 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1461                                       struct nfsd4_op *op)
1462 {
1463         u32 *bmap = op->u.getattr.ga_bmval;
1464         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1465         u32 ret = 0;
1466
1467         if (bmap0 & FATTR4_WORD0_ACL)
1468                 return svc_max_payload(rqstp);
1469         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1470                 return svc_max_payload(rqstp);
1471
1472         if (bmap1 & FATTR4_WORD1_OWNER) {
1473                 ret += IDMAP_NAMESZ + 4;
1474                 bmap1 &= ~FATTR4_WORD1_OWNER;
1475         }
1476         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1477                 ret += IDMAP_NAMESZ + 4;
1478                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1479         }
1480         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1481                 ret += NFS4_FHSIZE + 4;
1482                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1483         }
1484         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1485                 ret += NFSD4_MAX_SEC_LABEL_LEN + 12;
1486                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1487         }
1488         /*
1489          * Largest of remaining attributes are 16 bytes (e.g.,
1490          * supported_attributes)
1491          */
1492         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1493         /* bitmask, length */
1494         ret += 20;
1495         return ret;
1496 }
1497
1498 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1499 {
1500         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1501                 * sizeof(__be32);
1502 }
1503
1504 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1505 {
1506         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1507                 * sizeof(__be32);
1508 }
1509
1510 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1511 {
1512         return (op_encode_hdr_size + op_encode_stateid_maxsz
1513                 + op_encode_change_info_maxsz + 1
1514                 + nfs4_fattr_bitmap_maxsz
1515                 + op_encode_delegation_maxsz) * sizeof(__be32);
1516 }
1517
1518 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1519 {
1520         u32 maxcount = 0, rlen = 0;
1521
1522         maxcount = svc_max_payload(rqstp);
1523         rlen = op->u.read.rd_length;
1524
1525         if (rlen > maxcount)
1526                 rlen = maxcount;
1527
1528         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1529 }
1530
1531 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1532 {
1533         u32 maxcount = svc_max_payload(rqstp);
1534         u32 rlen = op->u.readdir.rd_maxcount;
1535
1536         if (rlen > maxcount)
1537                 rlen = maxcount;
1538
1539         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1540                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1541 }
1542
1543 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1544 {
1545         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1546                 * sizeof(__be32);
1547 }
1548
1549 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1550 {
1551         return (op_encode_hdr_size + op_encode_change_info_maxsz
1552                 + op_encode_change_info_maxsz) * sizeof(__be32);
1553 }
1554
1555 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1556                                        struct nfsd4_op *op)
1557 {
1558         return NFS4_MAX_SESSIONID_LEN + 20;
1559 }
1560
1561 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1562 {
1563         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1564 }
1565
1566 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1567 {
1568         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1569                                                                 sizeof(__be32);
1570 }
1571
1572 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1573 {
1574         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1575 }
1576
1577 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1578 {
1579         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1580                 1 + 1 + /* eir_flags, spr_how */\
1581                 4 + /* spo_must_enforce & _allow with bitmap */\
1582                 2 + /*eir_server_owner.so_minor_id */\
1583                 /* eir_server_owner.so_major_id<> */\
1584                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1585                 /* eir_server_scope<> */\
1586                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1587                 1 + /* eir_server_impl_id array length */\
1588                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1589 }
1590
1591 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1592 {
1593         return (op_encode_hdr_size + \
1594                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1595                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1596 }
1597
1598 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1599 {
1600         return (op_encode_hdr_size + \
1601                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1602                 2 + /* csr_sequence, csr_flags */\
1603                 op_encode_channel_attrs_maxsz + \
1604                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1605 }
1606
1607 static struct nfsd4_operation nfsd4_ops[] = {
1608         [OP_ACCESS] = {
1609                 .op_func = (nfsd4op_func)nfsd4_access,
1610                 .op_name = "OP_ACCESS",
1611         },
1612         [OP_CLOSE] = {
1613                 .op_func = (nfsd4op_func)nfsd4_close,
1614                 .op_flags = OP_MODIFIES_SOMETHING,
1615                 .op_name = "OP_CLOSE",
1616                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1617                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1618                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1619         },
1620         [OP_COMMIT] = {
1621                 .op_func = (nfsd4op_func)nfsd4_commit,
1622                 .op_flags = OP_MODIFIES_SOMETHING,
1623                 .op_name = "OP_COMMIT",
1624                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1625         },
1626         [OP_CREATE] = {
1627                 .op_func = (nfsd4op_func)nfsd4_create,
1628                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1629                 .op_name = "OP_CREATE",
1630                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1631         },
1632         [OP_DELEGRETURN] = {
1633                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1634                 .op_flags = OP_MODIFIES_SOMETHING,
1635                 .op_name = "OP_DELEGRETURN",
1636                 .op_rsize_bop = nfsd4_only_status_rsize,
1637                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1638         },
1639         [OP_GETATTR] = {
1640                 .op_func = (nfsd4op_func)nfsd4_getattr,
1641                 .op_flags = ALLOWED_ON_ABSENT_FS,
1642                 .op_rsize_bop = nfsd4_getattr_rsize,
1643                 .op_name = "OP_GETATTR",
1644         },
1645         [OP_GETFH] = {
1646                 .op_func = (nfsd4op_func)nfsd4_getfh,
1647                 .op_name = "OP_GETFH",
1648         },
1649         [OP_LINK] = {
1650                 .op_func = (nfsd4op_func)nfsd4_link,
1651                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1652                                 | OP_CACHEME,
1653                 .op_name = "OP_LINK",
1654                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1655         },
1656         [OP_LOCK] = {
1657                 .op_func = (nfsd4op_func)nfsd4_lock,
1658                 .op_flags = OP_MODIFIES_SOMETHING,
1659                 .op_name = "OP_LOCK",
1660                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1661                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1662         },
1663         [OP_LOCKT] = {
1664                 .op_func = (nfsd4op_func)nfsd4_lockt,
1665                 .op_name = "OP_LOCKT",
1666         },
1667         [OP_LOCKU] = {
1668                 .op_func = (nfsd4op_func)nfsd4_locku,
1669                 .op_flags = OP_MODIFIES_SOMETHING,
1670                 .op_name = "OP_LOCKU",
1671                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1672                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1673         },
1674         [OP_LOOKUP] = {
1675                 .op_func = (nfsd4op_func)nfsd4_lookup,
1676                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1677                 .op_name = "OP_LOOKUP",
1678         },
1679         [OP_LOOKUPP] = {
1680                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1681                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1682                 .op_name = "OP_LOOKUPP",
1683         },
1684         [OP_NVERIFY] = {
1685                 .op_func = (nfsd4op_func)nfsd4_nverify,
1686                 .op_name = "OP_NVERIFY",
1687         },
1688         [OP_OPEN] = {
1689                 .op_func = (nfsd4op_func)nfsd4_open,
1690                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1691                 .op_name = "OP_OPEN",
1692                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1693                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1694         },
1695         [OP_OPEN_CONFIRM] = {
1696                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1697                 .op_flags = OP_MODIFIES_SOMETHING,
1698                 .op_name = "OP_OPEN_CONFIRM",
1699                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1700         },
1701         [OP_OPEN_DOWNGRADE] = {
1702                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1703                 .op_flags = OP_MODIFIES_SOMETHING,
1704                 .op_name = "OP_OPEN_DOWNGRADE",
1705                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1706                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1707                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1708         },
1709         [OP_PUTFH] = {
1710                 .op_func = (nfsd4op_func)nfsd4_putfh,
1711                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1712                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1713                 .op_name = "OP_PUTFH",
1714                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1715         },
1716         [OP_PUTPUBFH] = {
1717                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1718                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1719                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1720                 .op_name = "OP_PUTPUBFH",
1721                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1722         },
1723         [OP_PUTROOTFH] = {
1724                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1725                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1726                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1727                 .op_name = "OP_PUTROOTFH",
1728                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1729         },
1730         [OP_READ] = {
1731                 .op_func = (nfsd4op_func)nfsd4_read,
1732                 .op_name = "OP_READ",
1733                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1734                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1735         },
1736         [OP_READDIR] = {
1737                 .op_func = (nfsd4op_func)nfsd4_readdir,
1738                 .op_name = "OP_READDIR",
1739                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1740         },
1741         [OP_READLINK] = {
1742                 .op_func = (nfsd4op_func)nfsd4_readlink,
1743                 .op_name = "OP_READLINK",
1744         },
1745         [OP_REMOVE] = {
1746                 .op_func = (nfsd4op_func)nfsd4_remove,
1747                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1748                 .op_name = "OP_REMOVE",
1749                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1750         },
1751         [OP_RENAME] = {
1752                 .op_func = (nfsd4op_func)nfsd4_rename,
1753                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1754                 .op_name = "OP_RENAME",
1755                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1756         },
1757         [OP_RENEW] = {
1758                 .op_func = (nfsd4op_func)nfsd4_renew,
1759                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1760                                 | OP_MODIFIES_SOMETHING,
1761                 .op_name = "OP_RENEW",
1762                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1763
1764         },
1765         [OP_RESTOREFH] = {
1766                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1767                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1768                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1769                 .op_name = "OP_RESTOREFH",
1770                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1771         },
1772         [OP_SAVEFH] = {
1773                 .op_func = (nfsd4op_func)nfsd4_savefh,
1774                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1775                 .op_name = "OP_SAVEFH",
1776                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1777         },
1778         [OP_SECINFO] = {
1779                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1780                 .op_flags = OP_HANDLES_WRONGSEC,
1781                 .op_name = "OP_SECINFO",
1782         },
1783         [OP_SETATTR] = {
1784                 .op_func = (nfsd4op_func)nfsd4_setattr,
1785                 .op_name = "OP_SETATTR",
1786                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1787                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1788                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1789         },
1790         [OP_SETCLIENTID] = {
1791                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1792                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1793                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1794                 .op_name = "OP_SETCLIENTID",
1795                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1796         },
1797         [OP_SETCLIENTID_CONFIRM] = {
1798                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1799                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1800                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1801                 .op_name = "OP_SETCLIENTID_CONFIRM",
1802                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1803         },
1804         [OP_VERIFY] = {
1805                 .op_func = (nfsd4op_func)nfsd4_verify,
1806                 .op_name = "OP_VERIFY",
1807         },
1808         [OP_WRITE] = {
1809                 .op_func = (nfsd4op_func)nfsd4_write,
1810                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1811                 .op_name = "OP_WRITE",
1812                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1813                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1814         },
1815         [OP_RELEASE_LOCKOWNER] = {
1816                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1817                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1818                                 | OP_MODIFIES_SOMETHING,
1819                 .op_name = "OP_RELEASE_LOCKOWNER",
1820                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1821         },
1822
1823         /* NFSv4.1 operations */
1824         [OP_EXCHANGE_ID] = {
1825                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1826                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1827                                 | OP_MODIFIES_SOMETHING,
1828                 .op_name = "OP_EXCHANGE_ID",
1829                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1830         },
1831         [OP_BACKCHANNEL_CTL] = {
1832                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1833                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1834                 .op_name = "OP_BACKCHANNEL_CTL",
1835                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1836         },
1837         [OP_BIND_CONN_TO_SESSION] = {
1838                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1839                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1840                                 | OP_MODIFIES_SOMETHING,
1841                 .op_name = "OP_BIND_CONN_TO_SESSION",
1842                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1843         },
1844         [OP_CREATE_SESSION] = {
1845                 .op_func = (nfsd4op_func)nfsd4_create_session,
1846                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1847                                 | OP_MODIFIES_SOMETHING,
1848                 .op_name = "OP_CREATE_SESSION",
1849                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1850         },
1851         [OP_DESTROY_SESSION] = {
1852                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1853                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1854                                 | OP_MODIFIES_SOMETHING,
1855                 .op_name = "OP_DESTROY_SESSION",
1856                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1857         },
1858         [OP_SEQUENCE] = {
1859                 .op_func = (nfsd4op_func)nfsd4_sequence,
1860                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1861                 .op_name = "OP_SEQUENCE",
1862         },
1863         [OP_DESTROY_CLIENTID] = {
1864                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1865                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1866                                 | OP_MODIFIES_SOMETHING,
1867                 .op_name = "OP_DESTROY_CLIENTID",
1868                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1869         },
1870         [OP_RECLAIM_COMPLETE] = {
1871                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1872                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1873                 .op_name = "OP_RECLAIM_COMPLETE",
1874                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1875         },
1876         [OP_SECINFO_NO_NAME] = {
1877                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1878                 .op_flags = OP_HANDLES_WRONGSEC,
1879                 .op_name = "OP_SECINFO_NO_NAME",
1880         },
1881         [OP_TEST_STATEID] = {
1882                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1883                 .op_flags = ALLOWED_WITHOUT_FH,
1884                 .op_name = "OP_TEST_STATEID",
1885         },
1886         [OP_FREE_STATEID] = {
1887                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1888                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1889                 .op_name = "OP_FREE_STATEID",
1890                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1891                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1892         },
1893 };
1894
1895 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
1896 {
1897         struct nfsd4_operation *opdesc;
1898         nfsd4op_rsize estimator;
1899
1900         if (op->opnum == OP_ILLEGAL)
1901                 return op_encode_hdr_size * sizeof(__be32);
1902         opdesc = OPDESC(op);
1903         estimator = opdesc->op_rsize_bop;
1904         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
1905 }
1906
1907 void warn_on_nonidempotent_op(struct nfsd4_op *op)
1908 {
1909         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
1910                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
1911                         op->opnum, nfsd4_op_name(op->opnum));
1912                 WARN_ON_ONCE(1);
1913         }
1914 }
1915
1916 static const char *nfsd4_op_name(unsigned opnum)
1917 {
1918         if (opnum < ARRAY_SIZE(nfsd4_ops))
1919                 return nfsd4_ops[opnum].op_name;
1920         return "unknown_operation";
1921 }
1922
1923 #define nfsd4_voidres                   nfsd4_voidargs
1924 struct nfsd4_voidargs { int dummy; };
1925
1926 static struct svc_procedure             nfsd_procedures4[2] = {
1927         [NFSPROC4_NULL] = {
1928                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1929                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1930                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1931                 .pc_ressize = sizeof(struct nfsd4_voidres),
1932                 .pc_cachetype = RC_NOCACHE,
1933                 .pc_xdrressize = 1,
1934         },
1935         [NFSPROC4_COMPOUND] = {
1936                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1937                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1938                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1939                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1940                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1941                 .pc_release = nfsd4_release_compoundargs,
1942                 .pc_cachetype = RC_NOCACHE,
1943                 .pc_xdrressize = NFSD_BUFSIZE/4,
1944         },
1945 };
1946
1947 struct svc_version      nfsd_version4 = {
1948                 .vs_vers        = 4,
1949                 .vs_nproc       = 2,
1950                 .vs_proc        = nfsd_procedures4,
1951                 .vs_dispatch    = nfsd_dispatch,
1952                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1953                 .vs_rpcb_optnl  = 1,
1954 };
1955
1956 /*
1957  * Local variables:
1958  *  c-basic-offset: 8
1959  * End:
1960  */