Pileus Git - ~andy/linux/blob - 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         nfs4_lock_state();
 790         /* check stateid */
 791         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 792                                                  cstate, &read->rd_stateid,
 793                                                  RD_STATE, &read->rd_filp))) {
 794                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 795                 goto out;
 796         }
 797         if (read->rd_filp)
 798                 get_file(read->rd_filp);
 799         status = nfs_ok;
 800 out:
 801         nfs4_unlock_state();
 802         read->rd_rqstp = rqstp;
 803         read->rd_fhp = &cstate->current_fh;
 804         return status;
 805 }
 806
 807 static __be32
 808 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 809               struct nfsd4_readdir *readdir)
 810 {
 811         u64 cookie = readdir->rd_cookie;
 812         static const nfs4_verifier zeroverf;
 813
 814         /* no need to check permission - this will be done in nfsd_readdir() */
 815
 816         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 817                 return nfserr_inval;
 818
 819         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 820         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 821         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 822
 823         if ((cookie == 1) || (cookie == 2) ||
 824             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 825                 return nfserr_bad_cookie;
 826
 827         readdir->rd_rqstp = rqstp;
 828         readdir->rd_fhp = &cstate->current_fh;
 829         return nfs_ok;
 830 }
 831
 832 static __be32
 833 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 834                struct nfsd4_readlink *readlink)
 835 {
 836         readlink->rl_rqstp = rqstp;
 837         readlink->rl_fhp = &cstate->current_fh;
 838         return nfs_ok;
 839 }
 840
 841 static __be32
 842 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 843              struct nfsd4_remove *remove)
 844 {
 845         __be32 status;
 846
 847         if (locks_in_grace(SVC_NET(rqstp)))
 848                 return nfserr_grace;
 849         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 850                              remove->rm_name, remove->rm_namelen);
 851         if (!status) {
 852                 fh_unlock(&cstate->current_fh);
 853                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 854         }
 855         return status;
 856 }
 857
 858 static __be32
 859 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 860              struct nfsd4_rename *rename)
 861 {
 862         __be32 status = nfserr_nofilehandle;
 863
 864         if (!cstate->save_fh.fh_dentry)
 865                 return status;
 866         if (locks_in_grace(SVC_NET(rqstp)) &&
 867                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 868                 return nfserr_grace;
 869         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 870                              rename->rn_snamelen, &cstate->current_fh,
 871                              rename->rn_tname, rename->rn_tnamelen);
 872         if (status)
 873                 return status;
 874         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 875         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 876         return nfs_ok;
 877 }
 878
 879 static __be32
 880 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 881               struct nfsd4_secinfo *secinfo)
 882 {
 883         struct svc_fh resfh;
 884         struct svc_export *exp;
 885         struct dentry *dentry;
 886         __be32 err;
 887
 888         fh_init(&resfh, NFS4_FHSIZE);
 889         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 890         if (err)
 891                 return err;
 892         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 893                                     secinfo->si_name, secinfo->si_namelen,
 894                                     &exp, &dentry);
 895         if (err)
 896                 return err;
 897         if (dentry->d_inode == NULL) {
 898                 exp_put(exp);
 899                 err = nfserr_noent;
 900         } else
 901                 secinfo->si_exp = exp;
 902         dput(dentry);
 903         if (cstate->minorversion)
 904                 /* See rfc 5661 section 2.6.3.1.1.8 */
 905                 fh_put(&cstate->current_fh);
 906         return err;
 907 }
 908
 909 static __be32
 910 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 911               struct nfsd4_secinfo_no_name *sin)
 912 {
 913         __be32 err;
 914
 915         switch (sin->sin_style) {
 916         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 917                 break;
 918         case NFS4_SECINFO_STYLE4_PARENT:
 919                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 920                 if (err)
 921                         return err;
 922                 break;
 923         default:
 924                 return nfserr_inval;
 925         }
 926         exp_get(cstate->current_fh.fh_export);
 927         sin->sin_exp = cstate->current_fh.fh_export;
 928         fh_put(&cstate->current_fh);
 929         return nfs_ok;
 930 }
 931
 932 static __be32
 933 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 934               struct nfsd4_setattr *setattr)
 935 {
 936         __be32 status = nfs_ok;
 937         int err;
 938
 939         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 940                 nfs4_lock_state();
 941                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 942                         &setattr->sa_stateid, WR_STATE, NULL);
 943                 nfs4_unlock_state();
 944                 if (status) {
 945                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 946                         return status;
 947                 }
 948         }
 949         err = fh_want_write(&cstate->current_fh);
 950         if (err)
 951                 return nfserrno(err);
 952         status = nfs_ok;
 953
 954         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 955                                     nfsd_attrmask);
 956         if (status)
 957                 goto out;
 958
 959         if (setattr->sa_acl != NULL)
 960                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 961                                             setattr->sa_acl);
 962         if (status)
 963                 goto out;
 964         if (setattr->sa_label.len)
 965                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 966                                 &setattr->sa_label);
 967         if (status)
 968                 goto out;
 969         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 970                                 0, (time_t)0);
 971 out:
 972         fh_drop_write(&cstate->current_fh);
 973         return status;
 974 }
 975
 976 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 977 {
 978         int i = 1;
 979         int buflen = write->wr_buflen;
 980
 981         vec[0].iov_base = write->wr_head.iov_base;
 982         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 983         buflen -= vec[0].iov_len;
 984
 985         while (buflen) {
 986                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 987                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 988                 buflen -= vec[i].iov_len;
 989                 i++;
 990         }
 991         return i;
 992 }
 993
 994 static __be32
 995 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 996             struct nfsd4_write *write)
 997 {
 998         stateid_t *stateid = &write->wr_stateid;
 999         struct file *filp = NULL;
1000         __be32 status = nfs_ok;
1001         unsigned long cnt;
1002         int nvecs;
1003
1004         /* no need to check permission - this will be done in nfsd_write() */
1005
1006         if (write->wr_offset >= OFFSET_MAX)
1007                 return nfserr_inval;
1008
1009         nfs4_lock_state();
1010         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
1011                                         cstate, stateid, WR_STATE, &filp);
1012         if (status) {
1013                 nfs4_unlock_state();
1014                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1015                 return status;
1016         }
1017         if (filp)
1018                 get_file(filp);
1019         nfs4_unlock_state();
1020
1021         cnt = write->wr_buflen;
1022         write->wr_how_written = write->wr_stable_how;
1023         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1024
1025         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1026         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1027
1028         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1029                              write->wr_offset, rqstp->rq_vec, nvecs,
1030                              &cnt, &write->wr_how_written);
1031         if (filp)
1032                 fput(filp);
1033
1034         write->wr_bytes_written = cnt;
1035
1036         return status;
1037 }
1038
1039 /* This routine never returns NFS_OK!  If there are no other errors, it
1040  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1041  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1042  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1043  */
1044 static __be32
1045 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1046              struct nfsd4_verify *verify)
1047 {
1048         __be32 *buf, *p;
1049         int count;
1050         __be32 status;
1051
1052         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1053         if (status)
1054                 return status;
1055
1056         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1057         if (status)
1058                 return status;
1059
1060         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1061             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1062                 return nfserr_inval;
1063         if (verify->ve_attrlen & 3)
1064                 return nfserr_inval;
1065
1066         /* count in words:
1067          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1068          */
1069         count = 4 + (verify->ve_attrlen >> 2);
1070         buf = kmalloc(count << 2, GFP_KERNEL);
1071         if (!buf)
1072                 return nfserr_jukebox;
1073
1074         p = buf;
1075         status = nfsd4_encode_fattr(&cstate->current_fh,
1076                                     cstate->current_fh.fh_export,
1077                                     cstate->current_fh.fh_dentry, &p,
1078                                     count, verify->ve_bmval,
1079                                     rqstp, 0);
1080         /*
1081          * If nfsd4_encode_fattr() ran out of space, assume that's because
1082          * the attributes are longer (hence different) than those given:
1083          */
1084         if (status == nfserr_resource)
1085                 status = nfserr_not_same;
1086         if (status)
1087                 goto out_kfree;
1088
1089         /* skip bitmap */
1090         p = buf + 1 + ntohl(buf[0]);
1091         status = nfserr_not_same;
1092         if (ntohl(*p++) != verify->ve_attrlen)
1093                 goto out_kfree;
1094         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1095                 status = nfserr_same;
1096
1097 out_kfree:
1098         kfree(buf);
1099         return status;
1100 }
1101
1102 static __be32
1103 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1104               struct nfsd4_verify *verify)
1105 {
1106         __be32 status;
1107
1108         status = _nfsd4_verify(rqstp, cstate, verify);
1109         return status == nfserr_not_same ? nfs_ok : status;
1110 }
1111
1112 static __be32
1113 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1114              struct nfsd4_verify *verify)
1115 {
1116         __be32 status;
1117
1118         status = _nfsd4_verify(rqstp, cstate, verify);
1119         return status == nfserr_same ? nfs_ok : status;
1120 }
1121
1122 /*
1123  * NULL call.
1124  */
1125 static __be32
1126 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1127 {
1128         return nfs_ok;
1129 }
1130
1131 static inline void nfsd4_increment_op_stats(u32 opnum)
1132 {
1133         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1134                 nfsdstats.nfs4_opcount[opnum]++;
1135 }
1136
1137 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1138                               void *);
1139 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1140 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1141 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1142
1143 enum nfsd4_op_flags {
1144         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1145         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1146         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1147         /* For rfc 5661 section 2.6.3.1.1: */
1148         OP_HANDLES_WRONGSEC = 1 << 3,
1149         OP_IS_PUTFH_LIKE = 1 << 4,
1150         /*
1151          * These are the ops whose result size we estimate before
1152          * encoding, to avoid performing an op then not being able to
1153          * respond or cache a response.  This includes writes and setattrs
1154          * as well as the operations usually called "nonidempotent":
1155          */
1156         OP_MODIFIES_SOMETHING = 1 << 5,
1157         /*
1158          * Cache compounds containing these ops in the xid-based drc:
1159          * We use the DRC for compounds containing non-idempotent
1160          * operations, *except* those that are 4.1-specific (since
1161          * sessions provide their own EOS), and except for stateful
1162          * operations other than setclientid and setclientid_confirm
1163          * (since sequence numbers provide EOS for open, lock, etc in
1164          * the v4.0 case).
1165          */
1166         OP_CACHEME = 1 << 6,
1167         /*
1168          * These are ops which clear current state id.
1169          */
1170         OP_CLEAR_STATEID = 1 << 7,
1171 };
1172
1173 struct nfsd4_operation {
1174         nfsd4op_func op_func;
1175         u32 op_flags;
1176         char *op_name;
1177         /* Try to get response size before operation */
1178         nfsd4op_rsize op_rsize_bop;
1179         stateid_getter op_get_currentstateid;
1180         stateid_setter op_set_currentstateid;
1181 };
1182
1183 static struct nfsd4_operation nfsd4_ops[];
1184
1185 #ifdef NFSD_DEBUG
1186 static const char *nfsd4_op_name(unsigned opnum);
1187 #endif
1188
1189 /*
1190  * Enforce NFSv4.1 COMPOUND ordering rules:
1191  *
1192  * Also note, enforced elsewhere:
1193  *      - SEQUENCE other than as first op results in
1194  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1195  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1196  *        (Enforced in nfsd4_bind_conn_to_session().)
1197  *      - DESTROY_SESSION must be the final operation in a compound, if
1198  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1199  *        (Enforced in nfsd4_destroy_session().)
1200  */
1201 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1202 {
1203         struct nfsd4_op *op = &args->ops[0];
1204
1205         /* These ordering requirements don't apply to NFSv4.0: */
1206         if (args->minorversion == 0)
1207                 return nfs_ok;
1208         /* This is weird, but OK, not our problem: */
1209         if (args->opcnt == 0)
1210                 return nfs_ok;
1211         if (op->status == nfserr_op_illegal)
1212                 return nfs_ok;
1213         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1214                 return nfserr_op_not_in_session;
1215         if (op->opnum == OP_SEQUENCE)
1216                 return nfs_ok;
1217         if (args->opcnt != 1)
1218                 return nfserr_not_only_op;
1219         return nfs_ok;
1220 }
1221
1222 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1223 {
1224         return &nfsd4_ops[op->opnum];
1225 }
1226
1227 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1228 {
1229         return OPDESC(op)->op_flags & OP_CACHEME;
1230 }
1231
1232 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1233 {
1234         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1235         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1236         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1237         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1238         struct nfsd4_operation *thisd;
1239         struct nfsd4_operation *nextd;
1240
1241         thisd = OPDESC(this);
1242         /*
1243          * Most ops check wronsec on our own; only the putfh-like ops
1244          * have special rules.
1245          */
1246         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1247                 return false;
1248         /*
1249          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1250          * put-filehandle operation if we're not going to use the
1251          * result:
1252          */
1253         if (argp->opcnt == resp->opcnt)
1254                 return false;
1255
1256         nextd = OPDESC(next);
1257         /*
1258          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1259          * errors themselves as necessary; others should check for them
1260          * now:
1261          */
1262         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1263 }
1264
1265 /*
1266  * COMPOUND call.
1267  */
1268 static __be32
1269 nfsd4_proc_compound(struct svc_rqst *rqstp,
1270                     struct nfsd4_compoundargs *args,
1271                     struct nfsd4_compoundres *resp)
1272 {
1273         struct nfsd4_op *op;
1274         struct nfsd4_operation *opdesc;
1275         struct nfsd4_compound_state *cstate = &resp->cstate;
1276         int             slack_bytes;
1277         u32             plen = 0;
1278         __be32          status;
1279
1280         resp->xbuf = &rqstp->rq_res;
1281         resp->p = rqstp->rq_res.head[0].iov_base +
1282                                                 rqstp->rq_res.head[0].iov_len;
1283         resp->tagp = resp->p;
1284         /* reserve space for: taglen, tag, and opcnt */
1285         resp->p += 2 + XDR_QUADLEN(args->taglen);
1286         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1287         resp->taglen = args->taglen;
1288         resp->tag = args->tag;
1289         resp->opcnt = 0;
1290         resp->rqstp = rqstp;
1291         resp->cstate.minorversion = args->minorversion;
1292         resp->cstate.replay_owner = NULL;
1293         resp->cstate.session = NULL;
1294         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1295         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1296         /*
1297          * Don't use the deferral mechanism for NFSv4; compounds make it
1298          * too hard to avoid non-idempotency problems.
1299          */
1300         rqstp->rq_usedeferral = 0;
1301
1302         /*
1303          * According to RFC3010, this takes precedence over all other errors.
1304          */
1305         status = nfserr_minor_vers_mismatch;
1306         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1307                 goto out;
1308
1309         status = nfs41_check_op_ordering(args);
1310         if (status) {
1311                 op = &args->ops[0];
1312                 op->status = status;
1313                 goto encode_op;
1314         }
1315
1316         while (!status && resp->opcnt < args->opcnt) {
1317                 op = &args->ops[resp->opcnt++];
1318
1319                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1320                         resp->opcnt, args->opcnt, op->opnum,
1321                         nfsd4_op_name(op->opnum));
1322                 /*
1323                  * The XDR decode routines may have pre-set op->status;
1324                  * for example, if there is a miscellaneous XDR error
1325                  * it will be set to nfserr_bad_xdr.
1326                  */
1327                 if (op->status) {
1328                         if (op->opnum == OP_OPEN)
1329                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1330                         goto encode_op;
1331                 }
1332
1333                 /* We must be able to encode a successful response to
1334                  * this operation, with enough room left over to encode a
1335                  * failed response to the next operation.  If we don't
1336                  * have enough room, fail with ERR_RESOURCE.
1337                  */
1338                 slack_bytes = (char *)resp->end - (char *)resp->p;
1339                 if (slack_bytes < COMPOUND_SLACK_SPACE
1340                                 + COMPOUND_ERR_SLACK_SPACE) {
1341                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1342                         op->status = nfserr_resource;
1343                         goto encode_op;
1344                 }
1345
1346                 opdesc = OPDESC(op);
1347
1348                 if (!cstate->current_fh.fh_dentry) {
1349                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1350                                 op->status = nfserr_nofilehandle;
1351                                 goto encode_op;
1352                         }
1353                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1354                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1355                         op->status = nfserr_moved;
1356                         goto encode_op;
1357                 }
1358
1359                 /* If op is non-idempotent */
1360                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1361                         plen = opdesc->op_rsize_bop(rqstp, op);
1362                         op->status = nfsd4_check_resp_size(resp, plen);
1363                 }
1364
1365                 if (op->status)
1366                         goto encode_op;
1367
1368                 if (opdesc->op_get_currentstateid)
1369                         opdesc->op_get_currentstateid(cstate, &op->u);
1370                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1371
1372                 if (!op->status) {
1373                         if (opdesc->op_set_currentstateid)
1374                                 opdesc->op_set_currentstateid(cstate, &op->u);
1375
1376                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1377                                 clear_current_stateid(cstate);
1378
1379                         if (need_wrongsec_check(rqstp))
1380                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1381                 }
1382
1383 encode_op:
1384                 /* Only from SEQUENCE */
1385                 if (resp->cstate.status == nfserr_replay_cache) {
1386                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1387                         status = op->status;
1388                         goto out;
1389                 }
1390                 if (op->status == nfserr_replay_me) {
1391                         op->replay = &cstate->replay_owner->so_replay;
1392                         nfsd4_encode_replay(resp, op);
1393                         status = op->status = op->replay->rp_status;
1394                 } else {
1395                         nfsd4_encode_operation(resp, op);
1396                         status = op->status;
1397                 }
1398
1399                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1400                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1401                         be32_to_cpu(status));
1402
1403                 if (cstate->replay_owner) {
1404                         nfs4_unlock_state();
1405                         cstate->replay_owner = NULL;
1406                 }
1407                 /* XXX Ugh, we need to get rid of this kind of special case: */
1408                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1409                         fput(op->u.read.rd_filp);
1410
1411                 nfsd4_increment_op_stats(op->opnum);
1412         }
1413
1414         resp->cstate.status = status;
1415         fh_put(&resp->cstate.current_fh);
1416         fh_put(&resp->cstate.save_fh);
1417         BUG_ON(resp->cstate.replay_owner);
1418 out:
1419         /* Reset deferral mechanism for RPC deferrals */
1420         rqstp->rq_usedeferral = 1;
1421         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1422         return status;
1423 }
1424
1425 #define op_encode_hdr_size              (2)
1426 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1427 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1428 #define op_encode_change_info_maxsz     (5)
1429 #define nfs4_fattr_bitmap_maxsz         (4)
1430
1431 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1432 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1433
1434 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1435
1436 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1437 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1438                                          op_encode_ace_maxsz)
1439
1440 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1441
1442 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1443 {
1444         return (op_encode_hdr_size) * sizeof(__be32);
1445 }
1446
1447 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1448 {
1449         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1450 }
1451
1452 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1453 {
1454         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1455 }
1456
1457 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1458 {
1459         return (op_encode_hdr_size + op_encode_change_info_maxsz
1460                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1461 }
1462
1463 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1464 {
1465         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1466                 * sizeof(__be32);
1467 }
1468
1469 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1470 {
1471         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1472                 * sizeof(__be32);
1473 }
1474
1475 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1476 {
1477         return (op_encode_hdr_size + op_encode_stateid_maxsz
1478                 + op_encode_change_info_maxsz + 1
1479                 + nfs4_fattr_bitmap_maxsz
1480                 + op_encode_delegation_maxsz) * sizeof(__be32);
1481 }
1482
1483 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1484 {
1485         u32 maxcount = 0, rlen = 0;
1486
1487         maxcount = svc_max_payload(rqstp);
1488         rlen = op->u.read.rd_length;
1489
1490         if (rlen > maxcount)
1491                 rlen = maxcount;
1492
1493         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1494 }
1495
1496 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1497 {
1498         u32 rlen = op->u.readdir.rd_maxcount;
1499
1500         if (rlen > PAGE_SIZE)
1501                 rlen = PAGE_SIZE;
1502
1503         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1504                  * sizeof(__be32) + rlen;
1505 }
1506
1507 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1508 {
1509         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1510                 * sizeof(__be32);
1511 }
1512
1513 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1514 {
1515         return (op_encode_hdr_size + op_encode_change_info_maxsz
1516                 + op_encode_change_info_maxsz) * sizeof(__be32);
1517 }
1518
1519 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1520 {
1521         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1522 }
1523
1524 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1525 {
1526         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1527 }
1528
1529 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1530 {
1531         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1532 }
1533
1534 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1535 {
1536         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1537                 1 + 1 + /* eir_flags, spr_how */\
1538                 4 + /* spo_must_enforce & _allow with bitmap */\
1539                 2 + /*eir_server_owner.so_minor_id */\
1540                 /* eir_server_owner.so_major_id<> */\
1541                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1542                 /* eir_server_scope<> */\
1543                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1544                 1 + /* eir_server_impl_id array length */\
1545                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1546 }
1547
1548 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1549 {
1550         return (op_encode_hdr_size + \
1551                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1552                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1553 }
1554
1555 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1556 {
1557         return (op_encode_hdr_size + \
1558                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1559                 2 + /* csr_sequence, csr_flags */\
1560                 op_encode_channel_attrs_maxsz + \
1561                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1562 }
1563
1564 static struct nfsd4_operation nfsd4_ops[] = {
1565         [OP_ACCESS] = {
1566                 .op_func = (nfsd4op_func)nfsd4_access,
1567                 .op_name = "OP_ACCESS",
1568         },
1569         [OP_CLOSE] = {
1570                 .op_func = (nfsd4op_func)nfsd4_close,
1571                 .op_flags = OP_MODIFIES_SOMETHING,
1572                 .op_name = "OP_CLOSE",
1573                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1574                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1575                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1576         },
1577         [OP_COMMIT] = {
1578                 .op_func = (nfsd4op_func)nfsd4_commit,
1579                 .op_flags = OP_MODIFIES_SOMETHING,
1580                 .op_name = "OP_COMMIT",
1581                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1582         },
1583         [OP_CREATE] = {
1584                 .op_func = (nfsd4op_func)nfsd4_create,
1585                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1586                 .op_name = "OP_CREATE",
1587                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1588         },
1589         [OP_DELEGRETURN] = {
1590                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1591                 .op_flags = OP_MODIFIES_SOMETHING,
1592                 .op_name = "OP_DELEGRETURN",
1593                 .op_rsize_bop = nfsd4_only_status_rsize,
1594                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1595         },
1596         [OP_GETATTR] = {
1597                 .op_func = (nfsd4op_func)nfsd4_getattr,
1598                 .op_flags = ALLOWED_ON_ABSENT_FS,
1599                 .op_name = "OP_GETATTR",
1600         },
1601         [OP_GETFH] = {
1602                 .op_func = (nfsd4op_func)nfsd4_getfh,
1603                 .op_name = "OP_GETFH",
1604         },
1605         [OP_LINK] = {
1606                 .op_func = (nfsd4op_func)nfsd4_link,
1607                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1608                                 | OP_CACHEME,
1609                 .op_name = "OP_LINK",
1610                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1611         },
1612         [OP_LOCK] = {
1613                 .op_func = (nfsd4op_func)nfsd4_lock,
1614                 .op_flags = OP_MODIFIES_SOMETHING,
1615                 .op_name = "OP_LOCK",
1616                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1617                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1618         },
1619         [OP_LOCKT] = {
1620                 .op_func = (nfsd4op_func)nfsd4_lockt,
1621                 .op_name = "OP_LOCKT",
1622         },
1623         [OP_LOCKU] = {
1624                 .op_func = (nfsd4op_func)nfsd4_locku,
1625                 .op_flags = OP_MODIFIES_SOMETHING,
1626                 .op_name = "OP_LOCKU",
1627                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1628                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1629         },
1630         [OP_LOOKUP] = {
1631                 .op_func = (nfsd4op_func)nfsd4_lookup,
1632                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1633                 .op_name = "OP_LOOKUP",
1634         },
1635         [OP_LOOKUPP] = {
1636                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1637                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1638                 .op_name = "OP_LOOKUPP",
1639         },
1640         [OP_NVERIFY] = {
1641                 .op_func = (nfsd4op_func)nfsd4_nverify,
1642                 .op_name = "OP_NVERIFY",
1643         },
1644         [OP_OPEN] = {
1645                 .op_func = (nfsd4op_func)nfsd4_open,
1646                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1647                 .op_name = "OP_OPEN",
1648                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1649                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1650         },
1651         [OP_OPEN_CONFIRM] = {
1652                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1653                 .op_flags = OP_MODIFIES_SOMETHING,
1654                 .op_name = "OP_OPEN_CONFIRM",
1655                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1656         },
1657         [OP_OPEN_DOWNGRADE] = {
1658                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1659                 .op_flags = OP_MODIFIES_SOMETHING,
1660                 .op_name = "OP_OPEN_DOWNGRADE",
1661                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1662                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1663                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1664         },
1665         [OP_PUTFH] = {
1666                 .op_func = (nfsd4op_func)nfsd4_putfh,
1667                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1668                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1669                                 | OP_CLEAR_STATEID,
1670                 .op_name = "OP_PUTFH",
1671                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1672         },
1673         [OP_PUTPUBFH] = {
1674                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1675                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1676                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1677                                 | OP_CLEAR_STATEID,
1678                 .op_name = "OP_PUTPUBFH",
1679                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1680         },
1681         [OP_PUTROOTFH] = {
1682                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1683                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1684                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1685                                 | OP_CLEAR_STATEID,
1686                 .op_name = "OP_PUTROOTFH",
1687                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1688         },
1689         [OP_READ] = {
1690                 .op_func = (nfsd4op_func)nfsd4_read,
1691                 .op_flags = OP_MODIFIES_SOMETHING,
1692                 .op_name = "OP_READ",
1693                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1694                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1695         },
1696         [OP_READDIR] = {
1697                 .op_func = (nfsd4op_func)nfsd4_readdir,
1698                 .op_flags = OP_MODIFIES_SOMETHING,
1699                 .op_name = "OP_READDIR",
1700                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1701         },
1702         [OP_READLINK] = {
1703                 .op_func = (nfsd4op_func)nfsd4_readlink,
1704                 .op_name = "OP_READLINK",
1705         },
1706         [OP_REMOVE] = {
1707                 .op_func = (nfsd4op_func)nfsd4_remove,
1708                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1709                 .op_name = "OP_REMOVE",
1710                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1711         },
1712         [OP_RENAME] = {
1713                 .op_func = (nfsd4op_func)nfsd4_rename,
1714                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1715                 .op_name = "OP_RENAME",
1716                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1717         },
1718         [OP_RENEW] = {
1719                 .op_func = (nfsd4op_func)nfsd4_renew,
1720                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1721                                 | OP_MODIFIES_SOMETHING,
1722                 .op_name = "OP_RENEW",
1723                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1724
1725         },
1726         [OP_RESTOREFH] = {
1727                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1728                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1729                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1730                 .op_name = "OP_RESTOREFH",
1731                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1732         },
1733         [OP_SAVEFH] = {
1734                 .op_func = (nfsd4op_func)nfsd4_savefh,
1735                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1736                 .op_name = "OP_SAVEFH",
1737                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1738         },
1739         [OP_SECINFO] = {
1740                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1741                 .op_flags = OP_HANDLES_WRONGSEC,
1742                 .op_name = "OP_SECINFO",
1743         },
1744         [OP_SETATTR] = {
1745                 .op_func = (nfsd4op_func)nfsd4_setattr,
1746                 .op_name = "OP_SETATTR",
1747                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1748                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1749                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1750         },
1751         [OP_SETCLIENTID] = {
1752                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1753                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1754                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1755                 .op_name = "OP_SETCLIENTID",
1756                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1757         },
1758         [OP_SETCLIENTID_CONFIRM] = {
1759                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1760                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1761                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1762                 .op_name = "OP_SETCLIENTID_CONFIRM",
1763                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1764         },
1765         [OP_VERIFY] = {
1766                 .op_func = (nfsd4op_func)nfsd4_verify,
1767                 .op_name = "OP_VERIFY",
1768         },
1769         [OP_WRITE] = {
1770                 .op_func = (nfsd4op_func)nfsd4_write,
1771                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1772                 .op_name = "OP_WRITE",
1773                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1774                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1775         },
1776         [OP_RELEASE_LOCKOWNER] = {
1777                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1778                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1779                                 | OP_MODIFIES_SOMETHING,
1780                 .op_name = "OP_RELEASE_LOCKOWNER",
1781                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1782         },
1783
1784         /* NFSv4.1 operations */
1785         [OP_EXCHANGE_ID] = {
1786                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1787                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1788                                 | OP_MODIFIES_SOMETHING,
1789                 .op_name = "OP_EXCHANGE_ID",
1790                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1791         },
1792         [OP_BACKCHANNEL_CTL] = {
1793                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1794                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1795                 .op_name = "OP_BACKCHANNEL_CTL",
1796                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1797         },
1798         [OP_BIND_CONN_TO_SESSION] = {
1799                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1800                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1801                                 | OP_MODIFIES_SOMETHING,
1802                 .op_name = "OP_BIND_CONN_TO_SESSION",
1803                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1804         },
1805         [OP_CREATE_SESSION] = {
1806                 .op_func = (nfsd4op_func)nfsd4_create_session,
1807                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1808                                 | OP_MODIFIES_SOMETHING,
1809                 .op_name = "OP_CREATE_SESSION",
1810                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1811         },
1812         [OP_DESTROY_SESSION] = {
1813                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1814                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1815                                 | OP_MODIFIES_SOMETHING,
1816                 .op_name = "OP_DESTROY_SESSION",
1817                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1818         },
1819         [OP_SEQUENCE] = {
1820                 .op_func = (nfsd4op_func)nfsd4_sequence,
1821                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1822                 .op_name = "OP_SEQUENCE",
1823         },
1824         [OP_DESTROY_CLIENTID] = {
1825                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1826                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1827                                 | OP_MODIFIES_SOMETHING,
1828                 .op_name = "OP_DESTROY_CLIENTID",
1829                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1830         },
1831         [OP_RECLAIM_COMPLETE] = {
1832                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1833                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1834                 .op_name = "OP_RECLAIM_COMPLETE",
1835                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1836         },
1837         [OP_SECINFO_NO_NAME] = {
1838                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1839                 .op_flags = OP_HANDLES_WRONGSEC,
1840                 .op_name = "OP_SECINFO_NO_NAME",
1841         },
1842         [OP_TEST_STATEID] = {
1843                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1844                 .op_flags = ALLOWED_WITHOUT_FH,
1845                 .op_name = "OP_TEST_STATEID",
1846         },
1847         [OP_FREE_STATEID] = {
1848                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1849                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1850                 .op_name = "OP_FREE_STATEID",
1851                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1852                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1853         },
1854 };
1855
1856 #ifdef NFSD_DEBUG
1857 static const char *nfsd4_op_name(unsigned opnum)
1858 {
1859         if (opnum < ARRAY_SIZE(nfsd4_ops))
1860                 return nfsd4_ops[opnum].op_name;
1861         return "unknown_operation";
1862 }
1863 #endif
1864
1865 #define nfsd4_voidres                   nfsd4_voidargs
1866 struct nfsd4_voidargs { int dummy; };
1867
1868 static struct svc_procedure             nfsd_procedures4[2] = {
1869         [NFSPROC4_NULL] = {
1870                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1871                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1872                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1873                 .pc_ressize = sizeof(struct nfsd4_voidres),
1874                 .pc_cachetype = RC_NOCACHE,
1875                 .pc_xdrressize = 1,
1876         },
1877         [NFSPROC4_COMPOUND] = {
1878                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1879                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1880                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1881                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1882                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1883                 .pc_release = nfsd4_release_compoundargs,
1884                 .pc_cachetype = RC_NOCACHE,
1885                 .pc_xdrressize = NFSD_BUFSIZE/4,
1886         },
1887 };
1888
1889 struct svc_version      nfsd_version4 = {
1890                 .vs_vers        = 4,
1891                 .vs_nproc       = 2,
1892                 .vs_proc        = nfsd_procedures4,
1893                 .vs_dispatch    = nfsd_dispatch,
1894                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1895                 .vs_rpcb_optnl  = 1,
1896 };
1897
1898 /*
1899  * Local variables:
1900  *  c-basic-offset: 8
1901  * End:
1902  */