fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/slab.h>
  37
  38 #include "idmap.h"
  39 #include "cache.h"
  40 #include "xdr4.h"
  41 #include "vfs.h"
  42 #include "current_stateid.h"
  43 #include "netns.h"
  44 #include "acl.h"
  45
  46 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  47 #include <linux/security.h>
  48
  49 static inline void
  50 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  51 {
  52         struct inode *inode = resfh->fh_dentry->d_inode;
  53         int status;
  54
  55         mutex_lock(&inode->i_mutex);
  56         status = security_inode_setsecctx(resfh->fh_dentry,
  57                 label->data, label->len);
  58         mutex_unlock(&inode->i_mutex);
  59
  60         if (status)
  61                 /*
  62                  * XXX: We should really fail the whole open, but we may
  63                  * already have created a new file, so it may be too
  64                  * late.  For now this seems the least of evils:
  65                  */
  66                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  67
  68         return;
  69 }
  70 #else
  71 static inline void
  72 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  73 { }
  74 #endif
  75
  76 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  77
  78 static u32 nfsd_attrmask[] = {
  79         NFSD_WRITEABLE_ATTRS_WORD0,
  80         NFSD_WRITEABLE_ATTRS_WORD1,
  81         NFSD_WRITEABLE_ATTRS_WORD2
  82 };
  83
  84 static u32 nfsd41_ex_attrmask[] = {
  85         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  86         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  87         NFSD_SUPPATTR_EXCLCREAT_WORD2
  88 };
  89
  90 static __be32
  91 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  92                    u32 *bmval, u32 *writable)
  93 {
  94         struct dentry *dentry = cstate->current_fh.fh_dentry;
  95
  96         /*
  97          * Check about attributes are supported by the NFSv4 server or not.
  98          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  99          */
 100         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 101             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 102             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 103                 return nfserr_attrnotsupp;
 104
 105         /*
 106          * Check FATTR4_WORD0_ACL can be supported
 107          * in current environment or not.
 108          */
 109         if (bmval[0] & FATTR4_WORD0_ACL) {
 110                 if (!IS_POSIXACL(dentry->d_inode))
 111                         return nfserr_attrnotsupp;
 112         }
 113
 114         /*
 115          * According to spec, read-only attributes return ERR_INVAL.
 116          */
 117         if (writable) {
 118                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 119                     (bmval[2] & ~writable[2]))
 120                         return nfserr_inval;
 121         }
 122
 123         return nfs_ok;
 124 }
 125
 126 static __be32
 127 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 128         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 129 {
 130         __be32 status = nfs_ok;
 131
 132         if (open->op_create == NFS4_OPEN_CREATE) {
 133                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 134                     || open->op_createmode == NFS4_CREATE_GUARDED)
 135                         status = check_attr_support(rqstp, cstate,
 136                                         open->op_bmval, nfsd_attrmask);
 137                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 138                         status = check_attr_support(rqstp, cstate,
 139                                         open->op_bmval, nfsd41_ex_attrmask);
 140         }
 141
 142         return status;
 143 }
 144
 145 static int
 146 is_create_with_attrs(struct nfsd4_open *open)
 147 {
 148         return open->op_create == NFS4_OPEN_CREATE
 149                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 150                     || open->op_createmode == NFS4_CREATE_GUARDED
 151                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 152 }
 153
 154 /*
 155  * if error occurs when setting the acl, just clear the acl bit
 156  * in the returned attr bitmap.
 157  */
 158 static void
 159 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 160                 struct nfs4_acl *acl, u32 *bmval)
 161 {
 162         __be32 status;
 163
 164         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 165         if (status)
 166                 /*
 167                  * We should probably fail the whole open at this point,
 168                  * but we've already created the file, so it's too late;
 169                  * So this seems the least of evils:
 170                  */
 171                 bmval[0] &= ~FATTR4_WORD0_ACL;
 172 }
 173
 174 static inline void
 175 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 176 {
 177         fh_put(dst);
 178         dget(src->fh_dentry);
 179         if (src->fh_export)
 180                 cache_get(&src->fh_export->h);
 181         *dst = *src;
 182 }
 183
 184 static __be32
 185 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 186 {
 187         __be32 status;
 188
 189         if (open->op_truncate &&
 190                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 191                 return nfserr_inval;
 192
 193         accmode |= NFSD_MAY_READ_IF_EXEC;
 194
 195         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 196                 accmode |= NFSD_MAY_READ;
 197         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 198                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 199         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 200                 accmode |= NFSD_MAY_WRITE;
 201
 202         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 203
 204         return status;
 205 }
 206
 207 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 208 {
 209         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 210
 211         if (S_ISREG(mode))
 212                 return nfs_ok;
 213         if (S_ISDIR(mode))
 214                 return nfserr_isdir;
 215         /*
 216          * Using err_symlink as our catch-all case may look odd; but
 217          * there's no other obvious error for this case in 4.0, and we
 218          * happen to know that it will cause the linux v4 client to do
 219          * the right thing on attempts to open something other than a
 220          * regular file.
 221          */
 222         return nfserr_symlink;
 223 }
 224
 225 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 226 {
 227         if (nfsd4_has_session(cstate))
 228                 return;
 229         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 230                         &resfh->fh_handle);
 231 }
 232
 233 static __be32
 234 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 235 {
 236         struct svc_fh *current_fh = &cstate->current_fh;
 237         int accmode;
 238         __be32 status;
 239
 240         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 241         if (!*resfh)
 242                 return nfserr_jukebox;
 243         fh_init(*resfh, NFS4_FHSIZE);
 244         open->op_truncate = 0;
 245
 246         if (open->op_create) {
 247                 /* FIXME: check session persistence and pnfs flags.
 248                  * The nfsv4.1 spec requires the following semantics:
 249                  *
 250                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 251                  * Reply Cache  | server |                 |
 252                  * -------------+--------+-----------------+--------------------
 253                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 254                  *              |        |                 | (SHOULD)
 255                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 256                  *              |        |                 | (SHOULD NOT)
 257                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 258                  * yes          | no     | GUARDED4        | GUARDED4
 259                  * yes          | yes    | GUARDED4        | GUARDED4
 260                  */
 261
 262                 /*
 263                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 264                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 265                  */
 266                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 267                                         open->op_fname.len, &open->op_iattr,
 268                                         *resfh, open->op_createmode,
 269                                         (u32 *)open->op_verf.data,
 270                                         &open->op_truncate, &open->op_created);
 271
 272                 if (!status && open->op_label.len)
 273                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 274
 275                 /*
 276                  * Following rfc 3530 14.2.16, use the returned bitmask
 277                  * to indicate which attributes we used to store the
 278                  * verifier:
 279                  */
 280                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 281                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 282                                                         FATTR4_WORD1_TIME_MODIFY);
 283         } else
 284                 /*
 285                  * Note this may exit with the parent still locked.
 286                  * We will hold the lock until nfsd4_open's final
 287                  * lookup, to prevent renames or unlinks until we've had
 288                  * a chance to an acquire a delegation if appropriate.
 289                  */
 290                 status = nfsd_lookup(rqstp, current_fh,
 291                                      open->op_fname.data, open->op_fname.len, *resfh);
 292         if (status)
 293                 goto out;
 294         status = nfsd_check_obj_isreg(*resfh);
 295         if (status)
 296                 goto out;
 297
 298         if (is_create_with_attrs(open) && open->op_acl != NULL)
 299                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 300
 301         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 302         accmode = NFSD_MAY_NOP;
 303         if (open->op_created ||
 304                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 305                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 306         status = do_open_permission(rqstp, *resfh, open, accmode);
 307         set_change_info(&open->op_cinfo, current_fh);
 308 out:
 309         return status;
 310 }
 311
 312 static __be32
 313 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 314 {
 315         struct svc_fh *current_fh = &cstate->current_fh;
 316         __be32 status;
 317         int accmode = 0;
 318
 319         /* We don't know the target directory, and therefore can not
 320         * set the change info
 321         */
 322
 323         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 324
 325         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 326
 327         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 328                 (open->op_iattr.ia_size == 0);
 329         /*
 330          * In the delegation case, the client is telling us about an
 331          * open that it *already* performed locally, some time ago.  We
 332          * should let it succeed now if possible.
 333          *
 334          * In the case of a CLAIM_FH open, on the other hand, the client
 335          * may be counting on us to enforce permissions (the Linux 4.1
 336          * client uses this for normal opens, for example).
 337          */
 338         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 339                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 340
 341         status = do_open_permission(rqstp, current_fh, open, accmode);
 342
 343         return status;
 344 }
 345
 346 static void
 347 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 348 {
 349         struct nfsd4_sessionid *sid =
 350                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 351
 352         clid->cl_boot = sid->clientid.cl_boot;
 353         clid->cl_id = sid->clientid.cl_id;
 354 }
 355
 356 static __be32
 357 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 358            struct nfsd4_open *open)
 359 {
 360         __be32 status;
 361         struct svc_fh *resfh = NULL;
 362         struct nfsd4_compoundres *resp;
 363         struct net *net = SVC_NET(rqstp);
 364         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 365
 366         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 367                 (int)open->op_fname.len, open->op_fname.data,
 368                 open->op_openowner);
 369
 370         /* This check required by spec. */
 371         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 372                 return nfserr_inval;
 373
 374         open->op_created = 0;
 375         /*
 376          * RFC5661 18.51.3
 377          * Before RECLAIM_COMPLETE done, server should deny new lock
 378          */
 379         if (nfsd4_has_session(cstate) &&
 380             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 381                       &cstate->session->se_client->cl_flags) &&
 382             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 383                 return nfserr_grace;
 384
 385         if (nfsd4_has_session(cstate))
 386                 copy_clientid(&open->op_clientid, cstate->session);
 387
 388         nfs4_lock_state();
 389
 390         /* check seqid for replay. set nfs4_owner */
 391         resp = rqstp->rq_resp;
 392         status = nfsd4_process_open1(&resp->cstate, open, nn);
 393         if (status == nfserr_replay_me) {
 394                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 395                 fh_put(&cstate->current_fh);
 396                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 397                                 &rp->rp_openfh);
 398                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 399                 if (status)
 400                         dprintk("nfsd4_open: replay failed"
 401                                 " restoring previous filehandle\n");
 402                 else
 403                         status = nfserr_replay_me;
 404         }
 405         if (status)
 406                 goto out;
 407         if (open->op_xdr_error) {
 408                 status = open->op_xdr_error;
 409                 goto out;
 410         }
 411
 412         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 413         if (status)
 414                 goto out;
 415
 416         /* Openowner is now set, so sequence id will get bumped.  Now we need
 417          * these checks before we do any creates: */
 418         status = nfserr_grace;
 419         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 420                 goto out;
 421         status = nfserr_no_grace;
 422         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 423                 goto out;
 424
 425         switch (open->op_claim_type) {
 426                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 427                 case NFS4_OPEN_CLAIM_NULL:
 428                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 429                         if (status)
 430                                 goto out;
 431                         break;
 432                 case NFS4_OPEN_CLAIM_PREVIOUS:
 433                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 434                         status = nfs4_check_open_reclaim(&open->op_clientid,
 435                                                          cstate->minorversion,
 436                                                          nn);
 437                         if (status)
 438                                 goto out;
 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                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 449                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 450                                 open->op_claim_type);
 451                         status = nfserr_notsupp;
 452                         goto out;
 453                 default:
 454                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 455                                 open->op_claim_type);
 456                         status = nfserr_inval;
 457                         goto out;
 458         }
 459         /*
 460          * nfsd4_process_open2() does the actual opening of the file.  If
 461          * successful, it (1) truncates the file if open->op_truncate was
 462          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 463          */
 464         status = nfsd4_process_open2(rqstp, resfh, open);
 465         WARN_ON(status && open->op_created);
 466 out:
 467         if (resfh && resfh != &cstate->current_fh) {
 468                 fh_dup2(&cstate->current_fh, resfh);
 469                 fh_put(resfh);
 470                 kfree(resfh);
 471         }
 472         nfsd4_cleanup_open_state(open, status);
 473         if (open->op_openowner && !nfsd4_has_session(cstate))
 474                 cstate->replay_owner = &open->op_openowner->oo_owner;
 475         nfsd4_bump_seqid(cstate, status);
 476         if (!cstate->replay_owner)
 477                 nfs4_unlock_state();
 478         return status;
 479 }
 480
 481 /*
 482  * OPEN is the only seqid-mutating operation whose decoding can fail
 483  * with a seqid-mutating error (specifically, decoding of user names in
 484  * the attributes).  Therefore we have to do some processing to look up
 485  * the stateowner so that we can bump the seqid.
 486  */
 487 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 488 {
 489         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 490
 491         if (!seqid_mutating_err(ntohl(op->status)))
 492                 return op->status;
 493         if (nfsd4_has_session(cstate))
 494                 return op->status;
 495         open->op_xdr_error = op->status;
 496         return nfsd4_open(rqstp, cstate, open);
 497 }
 498
 499 /*
 500  * filehandle-manipulating ops.
 501  */
 502 static __be32
 503 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 504             struct svc_fh **getfh)
 505 {
 506         if (!cstate->current_fh.fh_dentry)
 507                 return nfserr_nofilehandle;
 508
 509         *getfh = &cstate->current_fh;
 510         return nfs_ok;
 511 }
 512
 513 static __be32
 514 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 515             struct nfsd4_putfh *putfh)
 516 {
 517         fh_put(&cstate->current_fh);
 518         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 519         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 520                putfh->pf_fhlen);
 521         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 522 }
 523
 524 static __be32
 525 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 526                 void *arg)
 527 {
 528         __be32 status;
 529
 530         fh_put(&cstate->current_fh);
 531         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 532         return status;
 533 }
 534
 535 static __be32
 536 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 537                 void *arg)
 538 {
 539         if (!cstate->save_fh.fh_dentry)
 540                 return nfserr_restorefh;
 541
 542         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 543         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 544                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 545                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 546         }
 547         return nfs_ok;
 548 }
 549
 550 static __be32
 551 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 552              void *arg)
 553 {
 554         if (!cstate->current_fh.fh_dentry)
 555                 return nfserr_nofilehandle;
 556
 557         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 558         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 559                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 560                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 561         }
 562         return nfs_ok;
 563 }
 564
 565 /*
 566  * misc nfsv4 ops
 567  */
 568 static __be32
 569 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 570              struct nfsd4_access *access)
 571 {
 572         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 573                 return nfserr_inval;
 574
 575         access->ac_resp_access = access->ac_req_access;
 576         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 577                            &access->ac_supported);
 578 }
 579
 580 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 581 {
 582         __be32 verf[2];
 583         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 584
 585         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 586         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 587         memcpy(verifier->data, verf, sizeof(verifier->data));
 588 }
 589
 590 static __be32
 591 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 592              struct nfsd4_commit *commit)
 593 {
 594         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 595         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 596                              commit->co_count);
 597 }
 598
 599 static __be32
 600 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 601              struct nfsd4_create *create)
 602 {
 603         struct svc_fh resfh;
 604         __be32 status;
 605         dev_t rdev;
 606
 607         fh_init(&resfh, NFS4_FHSIZE);
 608
 609         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 610                            NFSD_MAY_CREATE);
 611         if (status)
 612                 return status;
 613
 614         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 615                                     nfsd_attrmask);
 616         if (status)
 617                 return status;
 618
 619         switch (create->cr_type) {
 620         case NF4LNK:
 621                 /* ugh! we have to null-terminate the linktext, or
 622                  * vfs_symlink() will choke.  it is always safe to
 623                  * null-terminate by brute force, since at worst we
 624                  * will overwrite the first byte of the create namelen
 625                  * in the XDR buffer, which has already been extracted
 626                  * during XDR decode.
 627                  */
 628                 create->cr_linkname[create->cr_linklen] = 0;
 629
 630                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 631                                       create->cr_name, create->cr_namelen,
 632                                       create->cr_linkname, create->cr_linklen,
 633                                       &resfh, &create->cr_iattr);
 634                 break;
 635
 636         case NF4BLK:
 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_IFBLK, rdev, &resfh);
 644                 break;
 645
 646         case NF4CHR:
 647                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 648                 if (MAJOR(rdev) != create->cr_specdata1 ||
 649                     MINOR(rdev) != create->cr_specdata2)
 650                         return nfserr_inval;
 651                 status = nfsd_create(rqstp, &cstate->current_fh,
 652                                      create->cr_name, create->cr_namelen,
 653                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 654                 break;
 655
 656         case NF4SOCK:
 657                 status = nfsd_create(rqstp, &cstate->current_fh,
 658                                      create->cr_name, create->cr_namelen,
 659                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 660                 break;
 661
 662         case NF4FIFO:
 663                 status = nfsd_create(rqstp, &cstate->current_fh,
 664                                      create->cr_name, create->cr_namelen,
 665                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 666                 break;
 667
 668         case NF4DIR:
 669                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 670                 status = nfsd_create(rqstp, &cstate->current_fh,
 671                                      create->cr_name, create->cr_namelen,
 672                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 673                 break;
 674
 675         default:
 676                 status = nfserr_badtype;
 677         }
 678
 679         if (status)
 680                 goto out;
 681
 682         if (create->cr_label.len)
 683                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 684
 685         if (create->cr_acl != NULL)
 686                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 687                                 create->cr_bmval);
 688
 689         fh_unlock(&cstate->current_fh);
 690         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 691         fh_dup2(&cstate->current_fh, &resfh);
 692 out:
 693         fh_put(&resfh);
 694         return status;
 695 }
 696
 697 static __be32
 698 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 699               struct nfsd4_getattr *getattr)
 700 {
 701         __be32 status;
 702
 703         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 704         if (status)
 705                 return status;
 706
 707         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 708                 return nfserr_inval;
 709
 710         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 711         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 712         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 713
 714         getattr->ga_fhp = &cstate->current_fh;
 715         return nfs_ok;
 716 }
 717
 718 static __be32
 719 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 720            struct nfsd4_link *link)
 721 {
 722         __be32 status = nfserr_nofilehandle;
 723
 724         if (!cstate->save_fh.fh_dentry)
 725                 return status;
 726         status = nfsd_link(rqstp, &cstate->current_fh,
 727                            link->li_name, link->li_namelen, &cstate->save_fh);
 728         if (!status)
 729                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 730         return status;
 731 }
 732
 733 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 734 {
 735         struct svc_fh tmp_fh;
 736         __be32 ret;
 737
 738         fh_init(&tmp_fh, NFS4_FHSIZE);
 739         ret = exp_pseudoroot(rqstp, &tmp_fh);
 740         if (ret)
 741                 return ret;
 742         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 743                 fh_put(&tmp_fh);
 744                 return nfserr_noent;
 745         }
 746         fh_put(&tmp_fh);
 747         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 748 }
 749
 750 static __be32
 751 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 752               void *arg)
 753 {
 754         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 755 }
 756
 757 static __be32
 758 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 759              struct nfsd4_lookup *lookup)
 760 {
 761         return nfsd_lookup(rqstp, &cstate->current_fh,
 762                            lookup->lo_name, lookup->lo_len,
 763                            &cstate->current_fh);
 764 }
 765
 766 static __be32
 767 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 768            struct nfsd4_read *read)
 769 {
 770         __be32 status;
 771
 772         /* no need to check permission - this will be done in nfsd_read() */
 773
 774         read->rd_filp = NULL;
 775         if (read->rd_offset >= OFFSET_MAX)
 776                 return nfserr_inval;
 777
 778         /*
 779          * If we do a zero copy read, then a client will see read data
 780          * that reflects the state of the file *after* performing the
 781          * following compound.
 782          *
 783          * To ensure proper ordering, we therefore turn off zero copy if
 784          * the client wants us to do more in this compound:
 785          */
 786         if (!nfsd4_last_compound_op(rqstp))
 787                 rqstp->rq_splice_ok = false;
 788
 789         /* check stateid */
 790         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 791                                                  cstate, &read->rd_stateid,
 792                                                  RD_STATE, &read->rd_filp))) {
 793                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 794                 goto out;
 795         }
 796         status = nfs_ok;
 797 out:
 798         read->rd_rqstp = rqstp;
 799         read->rd_fhp = &cstate->current_fh;
 800         return status;
 801 }
 802
 803 static __be32
 804 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 805               struct nfsd4_readdir *readdir)
 806 {
 807         u64 cookie = readdir->rd_cookie;
 808         static const nfs4_verifier zeroverf;
 809
 810         /* no need to check permission - this will be done in nfsd_readdir() */
 811
 812         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 813                 return nfserr_inval;
 814
 815         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 816         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 817         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 818
 819         if ((cookie == 1) || (cookie == 2) ||
 820             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 821                 return nfserr_bad_cookie;
 822
 823         readdir->rd_rqstp = rqstp;
 824         readdir->rd_fhp = &cstate->current_fh;
 825         return nfs_ok;
 826 }
 827
 828 static __be32
 829 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 830                struct nfsd4_readlink *readlink)
 831 {
 832         readlink->rl_rqstp = rqstp;
 833         readlink->rl_fhp = &cstate->current_fh;
 834         return nfs_ok;
 835 }
 836
 837 static __be32
 838 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 839              struct nfsd4_remove *remove)
 840 {
 841         __be32 status;
 842
 843         if (locks_in_grace(SVC_NET(rqstp)))
 844                 return nfserr_grace;
 845         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 846                              remove->rm_name, remove->rm_namelen);
 847         if (!status) {
 848                 fh_unlock(&cstate->current_fh);
 849                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 850         }
 851         return status;
 852 }
 853
 854 static __be32
 855 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 856              struct nfsd4_rename *rename)
 857 {
 858         __be32 status = nfserr_nofilehandle;
 859
 860         if (!cstate->save_fh.fh_dentry)
 861                 return status;
 862         if (locks_in_grace(SVC_NET(rqstp)) &&
 863                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 864                 return nfserr_grace;
 865         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 866                              rename->rn_snamelen, &cstate->current_fh,
 867                              rename->rn_tname, rename->rn_tnamelen);
 868         if (status)
 869                 return status;
 870         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 871         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 872         return nfs_ok;
 873 }
 874
 875 static __be32
 876 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 877               struct nfsd4_secinfo *secinfo)
 878 {
 879         struct svc_fh resfh;
 880         struct svc_export *exp;
 881         struct dentry *dentry;
 882         __be32 err;
 883
 884         fh_init(&resfh, NFS4_FHSIZE);
 885         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 886         if (err)
 887                 return err;
 888         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 889                                     secinfo->si_name, secinfo->si_namelen,
 890                                     &exp, &dentry);
 891         if (err)
 892                 return err;
 893         if (dentry->d_inode == NULL) {
 894                 exp_put(exp);
 895                 err = nfserr_noent;
 896         } else
 897                 secinfo->si_exp = exp;
 898         dput(dentry);
 899         if (cstate->minorversion)
 900                 /* See rfc 5661 section 2.6.3.1.1.8 */
 901                 fh_put(&cstate->current_fh);
 902         return err;
 903 }
 904
 905 static __be32
 906 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 907               struct nfsd4_secinfo_no_name *sin)
 908 {
 909         __be32 err;
 910
 911         switch (sin->sin_style) {
 912         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 913                 break;
 914         case NFS4_SECINFO_STYLE4_PARENT:
 915                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 916                 if (err)
 917                         return err;
 918                 break;
 919         default:
 920                 return nfserr_inval;
 921         }
 922         exp_get(cstate->current_fh.fh_export);
 923         sin->sin_exp = cstate->current_fh.fh_export;
 924         fh_put(&cstate->current_fh);
 925         return nfs_ok;
 926 }
 927
 928 static __be32
 929 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 930               struct nfsd4_setattr *setattr)
 931 {
 932         __be32 status = nfs_ok;
 933         int err;
 934
 935         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 936                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 937                         &setattr->sa_stateid, WR_STATE, NULL);
 938                 if (status) {
 939                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 940                         return status;
 941                 }
 942         }
 943         err = fh_want_write(&cstate->current_fh);
 944         if (err)
 945                 return nfserrno(err);
 946         status = nfs_ok;
 947
 948         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 949                                     nfsd_attrmask);
 950         if (status)
 951                 goto out;
 952
 953         if (setattr->sa_acl != NULL)
 954                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 955                                             setattr->sa_acl);
 956         if (status)
 957                 goto out;
 958         if (setattr->sa_label.len)
 959                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 960                                 &setattr->sa_label);
 961         if (status)
 962                 goto out;
 963         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 964                                 0, (time_t)0);
 965 out:
 966         fh_drop_write(&cstate->current_fh);
 967         return status;
 968 }
 969
 970 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 971 {
 972         int i = 1;
 973         int buflen = write->wr_buflen;
 974
 975         vec[0].iov_base = write->wr_head.iov_base;
 976         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 977         buflen -= vec[0].iov_len;
 978
 979         while (buflen) {
 980                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 981                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 982                 buflen -= vec[i].iov_len;
 983                 i++;
 984         }
 985         return i;
 986 }
 987
 988 static __be32
 989 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 990             struct nfsd4_write *write)
 991 {
 992         stateid_t *stateid = &write->wr_stateid;
 993         struct file *filp = NULL;
 994         __be32 status = nfs_ok;
 995         unsigned long cnt;
 996         int nvecs;
 997
 998         /* no need to check permission - this will be done in nfsd_write() */
 999
1000         if (write->wr_offset >= OFFSET_MAX)
1001                 return nfserr_inval;
1002
1003         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
1004                                         cstate, stateid, WR_STATE, &filp);
1005         if (status) {
1006                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1007                 return status;
1008         }
1009
1010         cnt = write->wr_buflen;
1011         write->wr_how_written = write->wr_stable_how;
1012         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1013
1014         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1015         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1016
1017         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1018                              write->wr_offset, rqstp->rq_vec, nvecs,
1019                              &cnt, &write->wr_how_written);
1020         if (filp)
1021                 fput(filp);
1022
1023         write->wr_bytes_written = cnt;
1024
1025         return status;
1026 }
1027
1028 /* This routine never returns NFS_OK!  If there are no other errors, it
1029  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1030  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1031  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1032  */
1033 static __be32
1034 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1035              struct nfsd4_verify *verify)
1036 {
1037         __be32 *buf, *p;
1038         int count;
1039         __be32 status;
1040
1041         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1042         if (status)
1043                 return status;
1044
1045         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1046         if (status)
1047                 return status;
1048
1049         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1050             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1051                 return nfserr_inval;
1052         if (verify->ve_attrlen & 3)
1053                 return nfserr_inval;
1054
1055         /* count in words:
1056          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1057          */
1058         count = 4 + (verify->ve_attrlen >> 2);
1059         buf = kmalloc(count << 2, GFP_KERNEL);
1060         if (!buf)
1061                 return nfserr_jukebox;
1062
1063         p = buf;
1064         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1065                                     cstate->current_fh.fh_export,
1066                                     cstate->current_fh.fh_dentry,
1067                                     verify->ve_bmval,
1068                                     rqstp, 0);
1069         /*
1070          * If nfsd4_encode_fattr() ran out of space, assume that's because
1071          * the attributes are longer (hence different) than those given:
1072          */
1073         if (status == nfserr_resource)
1074                 status = nfserr_not_same;
1075         if (status)
1076                 goto out_kfree;
1077
1078         /* skip bitmap */
1079         p = buf + 1 + ntohl(buf[0]);
1080         status = nfserr_not_same;
1081         if (ntohl(*p++) != verify->ve_attrlen)
1082                 goto out_kfree;
1083         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1084                 status = nfserr_same;
1085
1086 out_kfree:
1087         kfree(buf);
1088         return status;
1089 }
1090
1091 static __be32
1092 nfsd4_nverify(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_not_same ? nfs_ok : status;
1099 }
1100
1101 static __be32
1102 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1103              struct nfsd4_verify *verify)
1104 {
1105         __be32 status;
1106
1107         status = _nfsd4_verify(rqstp, cstate, verify);
1108         return status == nfserr_same ? nfs_ok : status;
1109 }
1110
1111 /*
1112  * NULL call.
1113  */
1114 static __be32
1115 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1116 {
1117         return nfs_ok;
1118 }
1119
1120 static inline void nfsd4_increment_op_stats(u32 opnum)
1121 {
1122         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1123                 nfsdstats.nfs4_opcount[opnum]++;
1124 }
1125
1126 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1127                               void *);
1128 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1129 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1130 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1131
1132 enum nfsd4_op_flags {
1133         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1134         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1135         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1136         /* For rfc 5661 section 2.6.3.1.1: */
1137         OP_HANDLES_WRONGSEC = 1 << 3,
1138         OP_IS_PUTFH_LIKE = 1 << 4,
1139         /*
1140          * These are the ops whose result size we estimate before
1141          * encoding, to avoid performing an op then not being able to
1142          * respond or cache a response.  This includes writes and setattrs
1143          * as well as the operations usually called "nonidempotent":
1144          */
1145         OP_MODIFIES_SOMETHING = 1 << 5,
1146         /*
1147          * Cache compounds containing these ops in the xid-based drc:
1148          * We use the DRC for compounds containing non-idempotent
1149          * operations, *except* those that are 4.1-specific (since
1150          * sessions provide their own EOS), and except for stateful
1151          * operations other than setclientid and setclientid_confirm
1152          * (since sequence numbers provide EOS for open, lock, etc in
1153          * the v4.0 case).
1154          */
1155         OP_CACHEME = 1 << 6,
1156         /*
1157          * These are ops which clear current state id.
1158          */
1159         OP_CLEAR_STATEID = 1 << 7,
1160 };
1161
1162 struct nfsd4_operation {
1163         nfsd4op_func op_func;
1164         u32 op_flags;
1165         char *op_name;
1166         /* Try to get response size before operation */
1167         nfsd4op_rsize op_rsize_bop;
1168         stateid_getter op_get_currentstateid;
1169         stateid_setter op_set_currentstateid;
1170 };
1171
1172 static struct nfsd4_operation nfsd4_ops[];
1173
1174 static const char *nfsd4_op_name(unsigned opnum);
1175
1176 /*
1177  * Enforce NFSv4.1 COMPOUND ordering rules:
1178  *
1179  * Also note, enforced elsewhere:
1180  *      - SEQUENCE other than as first op results in
1181  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1182  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1183  *        (Enforced in nfsd4_bind_conn_to_session().)
1184  *      - DESTROY_SESSION must be the final operation in a compound, if
1185  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1186  *        (Enforced in nfsd4_destroy_session().)
1187  */
1188 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1189 {
1190         struct nfsd4_op *op = &args->ops[0];
1191
1192         /* These ordering requirements don't apply to NFSv4.0: */
1193         if (args->minorversion == 0)
1194                 return nfs_ok;
1195         /* This is weird, but OK, not our problem: */
1196         if (args->opcnt == 0)
1197                 return nfs_ok;
1198         if (op->status == nfserr_op_illegal)
1199                 return nfs_ok;
1200         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1201                 return nfserr_op_not_in_session;
1202         if (op->opnum == OP_SEQUENCE)
1203                 return nfs_ok;
1204         if (args->opcnt != 1)
1205                 return nfserr_not_only_op;
1206         return nfs_ok;
1207 }
1208
1209 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1210 {
1211         return &nfsd4_ops[op->opnum];
1212 }
1213
1214 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1215 {
1216         if (op->opnum == OP_ILLEGAL)
1217                 return false;
1218         return OPDESC(op)->op_flags & OP_CACHEME;
1219 }
1220
1221 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1222 {
1223         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1224         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1225         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1226         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1227         struct nfsd4_operation *thisd;
1228         struct nfsd4_operation *nextd;
1229
1230         thisd = OPDESC(this);
1231         /*
1232          * Most ops check wronsec on our own; only the putfh-like ops
1233          * have special rules.
1234          */
1235         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1236                 return false;
1237         /*
1238          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1239          * put-filehandle operation if we're not going to use the
1240          * result:
1241          */
1242         if (argp->opcnt == resp->opcnt)
1243                 return false;
1244
1245         nextd = OPDESC(next);
1246         /*
1247          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1248          * errors themselves as necessary; others should check for them
1249          * now:
1250          */
1251         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1252 }
1253
1254 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1255                                struct nfsd4_compoundres *resp)
1256 {
1257         struct xdr_stream *xdr = &resp->xdr;
1258         struct xdr_buf *buf = &rqstp->rq_res;
1259         struct kvec *head = buf->head;
1260
1261         xdr->buf = buf;
1262         xdr->iov = head;
1263         xdr->p   = head->iov_base + head->iov_len;
1264         xdr->end = head->iov_base + PAGE_SIZE - 2 * RPC_MAX_AUTH_SIZE;
1265         /* Tail and page_len should be zero at this point: */
1266         buf->len = buf->head[0].iov_len;
1267         xdr->scratch.iov_len = 0;
1268         xdr->page_ptr = buf->pages;
1269         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1270                 - 2 * RPC_MAX_AUTH_SIZE;
1271 }
1272
1273 /*
1274  * COMPOUND call.
1275  */
1276 static __be32
1277 nfsd4_proc_compound(struct svc_rqst *rqstp,
1278                     struct nfsd4_compoundargs *args,
1279                     struct nfsd4_compoundres *resp)
1280 {
1281         struct nfsd4_op *op;
1282         struct nfsd4_operation *opdesc;
1283         struct nfsd4_compound_state *cstate = &resp->cstate;
1284         struct svc_fh *current_fh = &cstate->current_fh;
1285         struct svc_fh *save_fh = &cstate->save_fh;
1286         __be32          status;
1287
1288         svcxdr_init_encode(rqstp, resp);
1289         resp->tagp = resp->xdr.p;
1290         /* reserve space for: taglen, tag, and opcnt */
1291         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1292         resp->taglen = args->taglen;
1293         resp->tag = args->tag;
1294         resp->opcnt = 0;
1295         resp->rqstp = rqstp;
1296         cstate->minorversion = args->minorversion;
1297         cstate->replay_owner = NULL;
1298         cstate->session = NULL;
1299         fh_init(current_fh, NFS4_FHSIZE);
1300         fh_init(save_fh, NFS4_FHSIZE);
1301         /*
1302          * Don't use the deferral mechanism for NFSv4; compounds make it
1303          * too hard to avoid non-idempotency problems.
1304          */
1305         rqstp->rq_usedeferral = 0;
1306
1307         /*
1308          * According to RFC3010, this takes precedence over all other errors.
1309          */
1310         status = nfserr_minor_vers_mismatch;
1311         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1312                 goto out;
1313
1314         status = nfs41_check_op_ordering(args);
1315         if (status) {
1316                 op = &args->ops[0];
1317                 op->status = status;
1318                 goto encode_op;
1319         }
1320
1321         while (!status && resp->opcnt < args->opcnt) {
1322                 op = &args->ops[resp->opcnt++];
1323
1324                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1325                         resp->opcnt, args->opcnt, op->opnum,
1326                         nfsd4_op_name(op->opnum));
1327                 /*
1328                  * The XDR decode routines may have pre-set op->status;
1329                  * for example, if there is a miscellaneous XDR error
1330                  * it will be set to nfserr_bad_xdr.
1331                  */
1332                 if (op->status) {
1333                         if (op->opnum == OP_OPEN)
1334                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1335                         goto encode_op;
1336                 }
1337
1338                 opdesc = OPDESC(op);
1339
1340                 if (!current_fh->fh_dentry) {
1341                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1342                                 op->status = nfserr_nofilehandle;
1343                                 goto encode_op;
1344                         }
1345                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1346                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1347                         op->status = nfserr_moved;
1348                         goto encode_op;
1349                 }
1350
1351                 fh_clear_wcc(current_fh);
1352
1353                 /* If op is non-idempotent */
1354                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1355                         /*
1356                          * Don't execute this op if we couldn't encode a
1357                          * succesful reply:
1358                          */
1359                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1360                         /*
1361                          * Plus if there's another operation, make sure
1362                          * we'll have space to at least encode an error:
1363                          */
1364                         if (resp->opcnt < args->opcnt)
1365                                 plen += COMPOUND_ERR_SLACK_SPACE;
1366                         op->status = nfsd4_check_resp_size(resp, plen);
1367                 }
1368
1369                 if (op->status)
1370                         goto encode_op;
1371
1372                 if (opdesc->op_get_currentstateid)
1373                         opdesc->op_get_currentstateid(cstate, &op->u);
1374                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1375
1376                 if (!op->status) {
1377                         if (opdesc->op_set_currentstateid)
1378                                 opdesc->op_set_currentstateid(cstate, &op->u);
1379
1380                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1381                                 clear_current_stateid(cstate);
1382
1383                         if (need_wrongsec_check(rqstp))
1384                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1385                 }
1386
1387 encode_op:
1388                 /* Only from SEQUENCE */
1389                 if (cstate->status == nfserr_replay_cache) {
1390                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1391                         status = op->status;
1392                         goto out;
1393                 }
1394                 if (op->status == nfserr_replay_me) {
1395                         op->replay = &cstate->replay_owner->so_replay;
1396                         nfsd4_encode_replay(&resp->xdr, op);
1397                         status = op->status = op->replay->rp_status;
1398                 } else {
1399                         nfsd4_encode_operation(resp, op);
1400                         status = op->status;
1401                 }
1402
1403                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1404                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1405                         be32_to_cpu(status));
1406
1407                 if (cstate->replay_owner) {
1408                         nfs4_unlock_state();
1409                         cstate->replay_owner = NULL;
1410                 }
1411                 /* XXX Ugh, we need to get rid of this kind of special case: */
1412                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1413                         fput(op->u.read.rd_filp);
1414
1415                 nfsd4_increment_op_stats(op->opnum);
1416         }
1417
1418         cstate->status = status;
1419         fh_put(current_fh);
1420         fh_put(save_fh);
1421         BUG_ON(cstate->replay_owner);
1422 out:
1423         /* Reset deferral mechanism for RPC deferrals */
1424         rqstp->rq_usedeferral = 1;
1425         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1426         return status;
1427 }
1428
1429 #define op_encode_hdr_size              (2)
1430 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1431 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1432 #define op_encode_change_info_maxsz     (5)
1433 #define nfs4_fattr_bitmap_maxsz         (4)
1434
1435 /* We'll fall back on returning no lockowner if run out of space: */
1436 #define op_encode_lockowner_maxsz       (0)
1437 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1438
1439 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1440
1441 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1442 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1443                                          op_encode_ace_maxsz)
1444
1445 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1446
1447 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1448 {
1449         return (op_encode_hdr_size) * sizeof(__be32);
1450 }
1451
1452 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1453 {
1454         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1455 }
1456
1457 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1458 {
1459         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1460 }
1461
1462 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1463 {
1464         return (op_encode_hdr_size + op_encode_change_info_maxsz
1465                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1466 }
1467
1468 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1469 {
1470         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1471                 * sizeof(__be32);
1472 }
1473
1474 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1475 {
1476         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1477                 * sizeof(__be32);
1478 }
1479
1480 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1481 {
1482         return (op_encode_hdr_size + op_encode_stateid_maxsz
1483                 + op_encode_change_info_maxsz + 1
1484                 + nfs4_fattr_bitmap_maxsz
1485                 + op_encode_delegation_maxsz) * sizeof(__be32);
1486 }
1487
1488 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1489 {
1490         u32 maxcount = 0, rlen = 0;
1491
1492         maxcount = svc_max_payload(rqstp);
1493         rlen = op->u.read.rd_length;
1494
1495         if (rlen > maxcount)
1496                 rlen = maxcount;
1497
1498         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1499 }
1500
1501 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1502 {
1503         u32 maxcount = svc_max_payload(rqstp);
1504         u32 rlen = op->u.readdir.rd_maxcount;
1505
1506         if (rlen > maxcount)
1507                 rlen = maxcount;
1508
1509         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1510                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1511 }
1512
1513 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1514 {
1515         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1516                 * sizeof(__be32);
1517 }
1518
1519 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1520 {
1521         return (op_encode_hdr_size + op_encode_change_info_maxsz
1522                 + op_encode_change_info_maxsz) * sizeof(__be32);
1523 }
1524
1525 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1526 {
1527         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1528 }
1529
1530 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1531 {
1532         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1533                                                                 sizeof(__be32);
1534 }
1535
1536 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1537 {
1538         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1539 }
1540
1541 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1542 {
1543         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1544                 1 + 1 + /* eir_flags, spr_how */\
1545                 4 + /* spo_must_enforce & _allow with bitmap */\
1546                 2 + /*eir_server_owner.so_minor_id */\
1547                 /* eir_server_owner.so_major_id<> */\
1548                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1549                 /* eir_server_scope<> */\
1550                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1551                 1 + /* eir_server_impl_id array length */\
1552                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1553 }
1554
1555 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1556 {
1557         return (op_encode_hdr_size + \
1558                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1559                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1560 }
1561
1562 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1563 {
1564         return (op_encode_hdr_size + \
1565                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1566                 2 + /* csr_sequence, csr_flags */\
1567                 op_encode_channel_attrs_maxsz + \
1568                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1569 }
1570
1571 static struct nfsd4_operation nfsd4_ops[] = {
1572         [OP_ACCESS] = {
1573                 .op_func = (nfsd4op_func)nfsd4_access,
1574                 .op_name = "OP_ACCESS",
1575         },
1576         [OP_CLOSE] = {
1577                 .op_func = (nfsd4op_func)nfsd4_close,
1578                 .op_flags = OP_MODIFIES_SOMETHING,
1579                 .op_name = "OP_CLOSE",
1580                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1581                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1582                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1583         },
1584         [OP_COMMIT] = {
1585                 .op_func = (nfsd4op_func)nfsd4_commit,
1586                 .op_flags = OP_MODIFIES_SOMETHING,
1587                 .op_name = "OP_COMMIT",
1588                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1589         },
1590         [OP_CREATE] = {
1591                 .op_func = (nfsd4op_func)nfsd4_create,
1592                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1593                 .op_name = "OP_CREATE",
1594                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1595         },
1596         [OP_DELEGRETURN] = {
1597                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1598                 .op_flags = OP_MODIFIES_SOMETHING,
1599                 .op_name = "OP_DELEGRETURN",
1600                 .op_rsize_bop = nfsd4_only_status_rsize,
1601                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1602         },
1603         [OP_GETATTR] = {
1604                 .op_func = (nfsd4op_func)nfsd4_getattr,
1605                 .op_flags = ALLOWED_ON_ABSENT_FS,
1606                 .op_name = "OP_GETATTR",
1607         },
1608         [OP_GETFH] = {
1609                 .op_func = (nfsd4op_func)nfsd4_getfh,
1610                 .op_name = "OP_GETFH",
1611         },
1612         [OP_LINK] = {
1613                 .op_func = (nfsd4op_func)nfsd4_link,
1614                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1615                                 | OP_CACHEME,
1616                 .op_name = "OP_LINK",
1617                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1618         },
1619         [OP_LOCK] = {
1620                 .op_func = (nfsd4op_func)nfsd4_lock,
1621                 .op_flags = OP_MODIFIES_SOMETHING,
1622                 .op_name = "OP_LOCK",
1623                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1624                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1625         },
1626         [OP_LOCKT] = {
1627                 .op_func = (nfsd4op_func)nfsd4_lockt,
1628                 .op_name = "OP_LOCKT",
1629         },
1630         [OP_LOCKU] = {
1631                 .op_func = (nfsd4op_func)nfsd4_locku,
1632                 .op_flags = OP_MODIFIES_SOMETHING,
1633                 .op_name = "OP_LOCKU",
1634                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1635                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1636         },
1637         [OP_LOOKUP] = {
1638                 .op_func = (nfsd4op_func)nfsd4_lookup,
1639                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1640                 .op_name = "OP_LOOKUP",
1641         },
1642         [OP_LOOKUPP] = {
1643                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1644                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1645                 .op_name = "OP_LOOKUPP",
1646         },
1647         [OP_NVERIFY] = {
1648                 .op_func = (nfsd4op_func)nfsd4_nverify,
1649                 .op_name = "OP_NVERIFY",
1650         },
1651         [OP_OPEN] = {
1652                 .op_func = (nfsd4op_func)nfsd4_open,
1653                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1654                 .op_name = "OP_OPEN",
1655                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1656                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1657         },
1658         [OP_OPEN_CONFIRM] = {
1659                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1660                 .op_flags = OP_MODIFIES_SOMETHING,
1661                 .op_name = "OP_OPEN_CONFIRM",
1662                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1663         },
1664         [OP_OPEN_DOWNGRADE] = {
1665                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1666                 .op_flags = OP_MODIFIES_SOMETHING,
1667                 .op_name = "OP_OPEN_DOWNGRADE",
1668                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1669                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1670                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1671         },
1672         [OP_PUTFH] = {
1673                 .op_func = (nfsd4op_func)nfsd4_putfh,
1674                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1675                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1676                 .op_name = "OP_PUTFH",
1677                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1678         },
1679         [OP_PUTPUBFH] = {
1680                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1681                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1682                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1683                 .op_name = "OP_PUTPUBFH",
1684                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1685         },
1686         [OP_PUTROOTFH] = {
1687                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1688                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1689                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1690                 .op_name = "OP_PUTROOTFH",
1691                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1692         },
1693         [OP_READ] = {
1694                 .op_func = (nfsd4op_func)nfsd4_read,
1695                 .op_name = "OP_READ",
1696                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1697                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1698         },
1699         [OP_READDIR] = {
1700                 .op_func = (nfsd4op_func)nfsd4_readdir,
1701                 .op_name = "OP_READDIR",
1702                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1703         },
1704         [OP_READLINK] = {
1705                 .op_func = (nfsd4op_func)nfsd4_readlink,
1706                 .op_name = "OP_READLINK",
1707         },
1708         [OP_REMOVE] = {
1709                 .op_func = (nfsd4op_func)nfsd4_remove,
1710                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1711                 .op_name = "OP_REMOVE",
1712                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1713         },
1714         [OP_RENAME] = {
1715                 .op_func = (nfsd4op_func)nfsd4_rename,
1716                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1717                 .op_name = "OP_RENAME",
1718                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1719         },
1720         [OP_RENEW] = {
1721                 .op_func = (nfsd4op_func)nfsd4_renew,
1722                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1723                                 | OP_MODIFIES_SOMETHING,
1724                 .op_name = "OP_RENEW",
1725                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1726
1727         },
1728         [OP_RESTOREFH] = {
1729                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1730                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1731                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1732                 .op_name = "OP_RESTOREFH",
1733                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1734         },
1735         [OP_SAVEFH] = {
1736                 .op_func = (nfsd4op_func)nfsd4_savefh,
1737                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1738                 .op_name = "OP_SAVEFH",
1739                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1740         },
1741         [OP_SECINFO] = {
1742                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1743                 .op_flags = OP_HANDLES_WRONGSEC,
1744                 .op_name = "OP_SECINFO",
1745         },
1746         [OP_SETATTR] = {
1747                 .op_func = (nfsd4op_func)nfsd4_setattr,
1748                 .op_name = "OP_SETATTR",
1749                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1750                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1751                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1752         },
1753         [OP_SETCLIENTID] = {
1754                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1755                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1756                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1757                 .op_name = "OP_SETCLIENTID",
1758                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1759         },
1760         [OP_SETCLIENTID_CONFIRM] = {
1761                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1762                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1763                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1764                 .op_name = "OP_SETCLIENTID_CONFIRM",
1765                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1766         },
1767         [OP_VERIFY] = {
1768                 .op_func = (nfsd4op_func)nfsd4_verify,
1769                 .op_name = "OP_VERIFY",
1770         },
1771         [OP_WRITE] = {
1772                 .op_func = (nfsd4op_func)nfsd4_write,
1773                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1774                 .op_name = "OP_WRITE",
1775                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1776                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1777         },
1778         [OP_RELEASE_LOCKOWNER] = {
1779                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1780                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1781                                 | OP_MODIFIES_SOMETHING,
1782                 .op_name = "OP_RELEASE_LOCKOWNER",
1783                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1784         },
1785
1786         /* NFSv4.1 operations */
1787         [OP_EXCHANGE_ID] = {
1788                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1789                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1790                                 | OP_MODIFIES_SOMETHING,
1791                 .op_name = "OP_EXCHANGE_ID",
1792                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1793         },
1794         [OP_BACKCHANNEL_CTL] = {
1795                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1796                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1797                 .op_name = "OP_BACKCHANNEL_CTL",
1798                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1799         },
1800         [OP_BIND_CONN_TO_SESSION] = {
1801                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1802                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1803                                 | OP_MODIFIES_SOMETHING,
1804                 .op_name = "OP_BIND_CONN_TO_SESSION",
1805                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1806         },
1807         [OP_CREATE_SESSION] = {
1808                 .op_func = (nfsd4op_func)nfsd4_create_session,
1809                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1810                                 | OP_MODIFIES_SOMETHING,
1811                 .op_name = "OP_CREATE_SESSION",
1812                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1813         },
1814         [OP_DESTROY_SESSION] = {
1815                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1816                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1817                                 | OP_MODIFIES_SOMETHING,
1818                 .op_name = "OP_DESTROY_SESSION",
1819                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1820         },
1821         [OP_SEQUENCE] = {
1822                 .op_func = (nfsd4op_func)nfsd4_sequence,
1823                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1824                 .op_name = "OP_SEQUENCE",
1825         },
1826         [OP_DESTROY_CLIENTID] = {
1827                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1828                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1829                                 | OP_MODIFIES_SOMETHING,
1830                 .op_name = "OP_DESTROY_CLIENTID",
1831                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1832         },
1833         [OP_RECLAIM_COMPLETE] = {
1834                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1835                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1836                 .op_name = "OP_RECLAIM_COMPLETE",
1837                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1838         },
1839         [OP_SECINFO_NO_NAME] = {
1840                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1841                 .op_flags = OP_HANDLES_WRONGSEC,
1842                 .op_name = "OP_SECINFO_NO_NAME",
1843         },
1844         [OP_TEST_STATEID] = {
1845                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1846                 .op_flags = ALLOWED_WITHOUT_FH,
1847                 .op_name = "OP_TEST_STATEID",
1848         },
1849         [OP_FREE_STATEID] = {
1850                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1851                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1852                 .op_name = "OP_FREE_STATEID",
1853                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1854                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1855         },
1856 };
1857
1858 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
1859 {
1860         struct nfsd4_operation *opdesc;
1861         nfsd4op_rsize estimator;
1862
1863         if (op->opnum == OP_ILLEGAL)
1864                 return op_encode_hdr_size * sizeof(__be32);
1865         opdesc = OPDESC(op);
1866         estimator = opdesc->op_rsize_bop;
1867         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
1868 }
1869
1870 void warn_on_nonidempotent_op(struct nfsd4_op *op)
1871 {
1872         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
1873                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
1874                         op->opnum, nfsd4_op_name(op->opnum));
1875                 WARN_ON_ONCE(1);
1876         }
1877 }
1878
1879 static const char *nfsd4_op_name(unsigned opnum)
1880 {
1881         if (opnum < ARRAY_SIZE(nfsd4_ops))
1882                 return nfsd4_ops[opnum].op_name;
1883         return "unknown_operation";
1884 }
1885
1886 #define nfsd4_voidres                   nfsd4_voidargs
1887 struct nfsd4_voidargs { int dummy; };
1888
1889 static struct svc_procedure             nfsd_procedures4[2] = {
1890         [NFSPROC4_NULL] = {
1891                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1892                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1893                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1894                 .pc_ressize = sizeof(struct nfsd4_voidres),
1895                 .pc_cachetype = RC_NOCACHE,
1896                 .pc_xdrressize = 1,
1897         },
1898         [NFSPROC4_COMPOUND] = {
1899                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1900                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1901                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1902                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1903                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1904                 .pc_release = nfsd4_release_compoundargs,
1905                 .pc_cachetype = RC_NOCACHE,
1906                 .pc_xdrressize = NFSD_BUFSIZE/4,
1907         },
1908 };
1909
1910 struct svc_version      nfsd_version4 = {
1911                 .vs_vers        = 4,
1912                 .vs_nproc       = 2,
1913                 .vs_proc        = nfsd_procedures4,
1914                 .vs_dispatch    = nfsd_dispatch,
1915                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1916                 .vs_rpcb_optnl  = 1,
1917 };
1918
1919 /*
1920  * Local variables:
1921  *  c-basic-offset: 8
1922  * End:
1923  */