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/falloc.h>
  37 #include <linux/slab.h>
  38
  39 #include "idmap.h"
  40 #include "cache.h"
  41 #include "xdr4.h"
  42 #include "vfs.h"
  43 #include "current_stateid.h"
  44 #include "netns.h"
  45 #include "acl.h"
  46
  47 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  48 #include <linux/security.h>
  49
  50 static inline void
  51 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  52 {
  53         struct inode *inode = resfh->fh_dentry->d_inode;
  54         int status;
  55
  56         mutex_lock(&inode->i_mutex);
  57         status = security_inode_setsecctx(resfh->fh_dentry,
  58                 label->data, label->len);
  59         mutex_unlock(&inode->i_mutex);
  60
  61         if (status)
  62                 /*
  63                  * XXX: We should really fail the whole open, but we may
  64                  * already have created a new file, so it may be too
  65                  * late.  For now this seems the least of evils:
  66                  */
  67                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  68
  69         return;
  70 }
  71 #else
  72 static inline void
  73 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  74 { }
  75 #endif
  76
  77 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  78
  79 static u32 nfsd_attrmask[] = {
  80         NFSD_WRITEABLE_ATTRS_WORD0,
  81         NFSD_WRITEABLE_ATTRS_WORD1,
  82         NFSD_WRITEABLE_ATTRS_WORD2
  83 };
  84
  85 static u32 nfsd41_ex_attrmask[] = {
  86         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  87         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  88         NFSD_SUPPATTR_EXCLCREAT_WORD2
  89 };
  90
  91 static __be32
  92 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  93                    u32 *bmval, u32 *writable)
  94 {
  95         struct dentry *dentry = cstate->current_fh.fh_dentry;
  96
  97         /*
  98          * Check about attributes are supported by the NFSv4 server or not.
  99          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
 100          */
 101         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 102             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 103             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 104                 return nfserr_attrnotsupp;
 105
 106         /*
 107          * Check FATTR4_WORD0_ACL can be supported
 108          * in current environment or not.
 109          */
 110         if (bmval[0] & FATTR4_WORD0_ACL) {
 111                 if (!IS_POSIXACL(dentry->d_inode))
 112                         return nfserr_attrnotsupp;
 113         }
 114
 115         /*
 116          * According to spec, read-only attributes return ERR_INVAL.
 117          */
 118         if (writable) {
 119                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 120                     (bmval[2] & ~writable[2]))
 121                         return nfserr_inval;
 122         }
 123
 124         return nfs_ok;
 125 }
 126
 127 static __be32
 128 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 129         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 130 {
 131         __be32 status = nfs_ok;
 132
 133         if (open->op_create == NFS4_OPEN_CREATE) {
 134                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 135                     || open->op_createmode == NFS4_CREATE_GUARDED)
 136                         status = check_attr_support(rqstp, cstate,
 137                                         open->op_bmval, nfsd_attrmask);
 138                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 139                         status = check_attr_support(rqstp, cstate,
 140                                         open->op_bmval, nfsd41_ex_attrmask);
 141         }
 142
 143         return status;
 144 }
 145
 146 static int
 147 is_create_with_attrs(struct nfsd4_open *open)
 148 {
 149         return open->op_create == NFS4_OPEN_CREATE
 150                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 151                     || open->op_createmode == NFS4_CREATE_GUARDED
 152                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 153 }
 154
 155 /*
 156  * if error occurs when setting the acl, just clear the acl bit
 157  * in the returned attr bitmap.
 158  */
 159 static void
 160 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 161                 struct nfs4_acl *acl, u32 *bmval)
 162 {
 163         __be32 status;
 164
 165         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 166         if (status)
 167                 /*
 168                  * We should probably fail the whole open at this point,
 169                  * but we've already created the file, so it's too late;
 170                  * So this seems the least of evils:
 171                  */
 172                 bmval[0] &= ~FATTR4_WORD0_ACL;
 173 }
 174
 175 static inline void
 176 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 177 {
 178         fh_put(dst);
 179         dget(src->fh_dentry);
 180         if (src->fh_export)
 181                 exp_get(src->fh_export);
 182         *dst = *src;
 183 }
 184
 185 static __be32
 186 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 187 {
 188         __be32 status;
 189
 190         if (open->op_truncate &&
 191                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 192                 return nfserr_inval;
 193
 194         accmode |= NFSD_MAY_READ_IF_EXEC;
 195
 196         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 197                 accmode |= NFSD_MAY_READ;
 198         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 199                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 200         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 201                 accmode |= NFSD_MAY_WRITE;
 202
 203         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 204
 205         return status;
 206 }
 207
 208 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 209 {
 210         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 211
 212         if (S_ISREG(mode))
 213                 return nfs_ok;
 214         if (S_ISDIR(mode))
 215                 return nfserr_isdir;
 216         /*
 217          * Using err_symlink as our catch-all case may look odd; but
 218          * there's no other obvious error for this case in 4.0, and we
 219          * happen to know that it will cause the linux v4 client to do
 220          * the right thing on attempts to open something other than a
 221          * regular file.
 222          */
 223         return nfserr_symlink;
 224 }
 225
 226 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 227 {
 228         if (nfsd4_has_session(cstate))
 229                 return;
 230         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 231                         &resfh->fh_handle);
 232 }
 233
 234 static __be32
 235 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 236 {
 237         struct svc_fh *current_fh = &cstate->current_fh;
 238         int accmode;
 239         __be32 status;
 240
 241         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 242         if (!*resfh)
 243                 return nfserr_jukebox;
 244         fh_init(*resfh, NFS4_FHSIZE);
 245         open->op_truncate = 0;
 246
 247         if (open->op_create) {
 248                 /* FIXME: check session persistence and pnfs flags.
 249                  * The nfsv4.1 spec requires the following semantics:
 250                  *
 251                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 252                  * Reply Cache  | server |                 |
 253                  * -------------+--------+-----------------+--------------------
 254                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 255                  *              |        |                 | (SHOULD)
 256                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 257                  *              |        |                 | (SHOULD NOT)
 258                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 259                  * yes          | no     | GUARDED4        | GUARDED4
 260                  * yes          | yes    | GUARDED4        | GUARDED4
 261                  */
 262
 263                 /*
 264                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 265                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 266                  */
 267                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 268                                         open->op_fname.len, &open->op_iattr,
 269                                         *resfh, open->op_createmode,
 270                                         (u32 *)open->op_verf.data,
 271                                         &open->op_truncate, &open->op_created);
 272
 273                 if (!status && open->op_label.len)
 274                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 275
 276                 /*
 277                  * Following rfc 3530 14.2.16, use the returned bitmask
 278                  * to indicate which attributes we used to store the
 279                  * verifier:
 280                  */
 281                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 282                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 283                                                         FATTR4_WORD1_TIME_MODIFY);
 284         } else
 285                 /*
 286                  * Note this may exit with the parent still locked.
 287                  * We will hold the lock until nfsd4_open's final
 288                  * lookup, to prevent renames or unlinks until we've had
 289                  * a chance to an acquire a delegation if appropriate.
 290                  */
 291                 status = nfsd_lookup(rqstp, current_fh,
 292                                      open->op_fname.data, open->op_fname.len, *resfh);
 293         if (status)
 294                 goto out;
 295         status = nfsd_check_obj_isreg(*resfh);
 296         if (status)
 297                 goto out;
 298
 299         if (is_create_with_attrs(open) && open->op_acl != NULL)
 300                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 301
 302         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 303         accmode = NFSD_MAY_NOP;
 304         if (open->op_created ||
 305                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 306                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 307         status = do_open_permission(rqstp, *resfh, open, accmode);
 308         set_change_info(&open->op_cinfo, current_fh);
 309 out:
 310         return status;
 311 }
 312
 313 static __be32
 314 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 315 {
 316         struct svc_fh *current_fh = &cstate->current_fh;
 317         __be32 status;
 318         int accmode = 0;
 319
 320         /* We don't know the target directory, and therefore can not
 321         * set the change info
 322         */
 323
 324         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 325
 326         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 327
 328         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 329                 (open->op_iattr.ia_size == 0);
 330         /*
 331          * In the delegation case, the client is telling us about an
 332          * open that it *already* performed locally, some time ago.  We
 333          * should let it succeed now if possible.
 334          *
 335          * In the case of a CLAIM_FH open, on the other hand, the client
 336          * may be counting on us to enforce permissions (the Linux 4.1
 337          * client uses this for normal opens, for example).
 338          */
 339         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 340                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 341
 342         status = do_open_permission(rqstp, current_fh, open, accmode);
 343
 344         return status;
 345 }
 346
 347 static void
 348 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 349 {
 350         struct nfsd4_sessionid *sid =
 351                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 352
 353         clid->cl_boot = sid->clientid.cl_boot;
 354         clid->cl_id = sid->clientid.cl_id;
 355 }
 356
 357 static __be32
 358 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 359            struct nfsd4_open *open)
 360 {
 361         __be32 status;
 362         struct svc_fh *resfh = NULL;
 363         struct nfsd4_compoundres *resp;
 364         struct net *net = SVC_NET(rqstp);
 365         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 366
 367         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 368                 (int)open->op_fname.len, open->op_fname.data,
 369                 open->op_openowner);
 370
 371         /* This check required by spec. */
 372         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 373                 return nfserr_inval;
 374
 375         open->op_created = 0;
 376         /*
 377          * RFC5661 18.51.3
 378          * Before RECLAIM_COMPLETE done, server should deny new lock
 379          */
 380         if (nfsd4_has_session(cstate) &&
 381             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 382                       &cstate->session->se_client->cl_flags) &&
 383             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 384                 return nfserr_grace;
 385
 386         if (nfsd4_has_session(cstate))
 387                 copy_clientid(&open->op_clientid, cstate->session);
 388
 389         /* check seqid for replay. set nfs4_owner */
 390         resp = rqstp->rq_resp;
 391         status = nfsd4_process_open1(&resp->cstate, open, nn);
 392         if (status == nfserr_replay_me) {
 393                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 394                 fh_put(&cstate->current_fh);
 395                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 396                                 &rp->rp_openfh);
 397                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 398                 if (status)
 399                         dprintk("nfsd4_open: replay failed"
 400                                 " restoring previous filehandle\n");
 401                 else
 402                         status = nfserr_replay_me;
 403         }
 404         if (status)
 405                 goto out;
 406         if (open->op_xdr_error) {
 407                 status = open->op_xdr_error;
 408                 goto out;
 409         }
 410
 411         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 412         if (status)
 413                 goto out;
 414
 415         /* Openowner is now set, so sequence id will get bumped.  Now we need
 416          * these checks before we do any creates: */
 417         status = nfserr_grace;
 418         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 419                 goto out;
 420         status = nfserr_no_grace;
 421         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 422                 goto out;
 423
 424         switch (open->op_claim_type) {
 425                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 426                 case NFS4_OPEN_CLAIM_NULL:
 427                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 428                         if (status)
 429                                 goto out;
 430                         break;
 431                 case NFS4_OPEN_CLAIM_PREVIOUS:
 432                         status = nfs4_check_open_reclaim(&open->op_clientid,
 433                                                          cstate, nn);
 434                         if (status)
 435                                 goto out;
 436                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 437                 case NFS4_OPEN_CLAIM_FH:
 438                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 439                         status = do_open_fhandle(rqstp, cstate, open);
 440                         if (status)
 441                                 goto out;
 442                         resfh = &cstate->current_fh;
 443                         break;
 444                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 445                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 446                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 447                                 open->op_claim_type);
 448                         status = nfserr_notsupp;
 449                         goto out;
 450                 default:
 451                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 452                                 open->op_claim_type);
 453                         status = nfserr_inval;
 454                         goto out;
 455         }
 456         /*
 457          * nfsd4_process_open2() does the actual opening of the file.  If
 458          * successful, it (1) truncates the file if open->op_truncate was
 459          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 460          */
 461         status = nfsd4_process_open2(rqstp, resfh, open);
 462         WARN(status && open->op_created,
 463              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 464              be32_to_cpu(status));
 465 out:
 466         if (resfh && resfh != &cstate->current_fh) {
 467                 fh_dup2(&cstate->current_fh, resfh);
 468                 fh_put(resfh);
 469                 kfree(resfh);
 470         }
 471         nfsd4_cleanup_open_state(cstate, open, status);
 472         nfsd4_bump_seqid(cstate, status);
 473         return status;
 474 }
 475
 476 /*
 477  * OPEN is the only seqid-mutating operation whose decoding can fail
 478  * with a seqid-mutating error (specifically, decoding of user names in
 479  * the attributes).  Therefore we have to do some processing to look up
 480  * the stateowner so that we can bump the seqid.
 481  */
 482 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 483 {
 484         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 485
 486         if (!seqid_mutating_err(ntohl(op->status)))
 487                 return op->status;
 488         if (nfsd4_has_session(cstate))
 489                 return op->status;
 490         open->op_xdr_error = op->status;
 491         return nfsd4_open(rqstp, cstate, open);
 492 }
 493
 494 /*
 495  * filehandle-manipulating ops.
 496  */
 497 static __be32
 498 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 499             struct svc_fh **getfh)
 500 {
 501         if (!cstate->current_fh.fh_dentry)
 502                 return nfserr_nofilehandle;
 503
 504         *getfh = &cstate->current_fh;
 505         return nfs_ok;
 506 }
 507
 508 static __be32
 509 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510             struct nfsd4_putfh *putfh)
 511 {
 512         fh_put(&cstate->current_fh);
 513         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 514         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 515                putfh->pf_fhlen);
 516         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 517 }
 518
 519 static __be32
 520 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 521                 void *arg)
 522 {
 523         __be32 status;
 524
 525         fh_put(&cstate->current_fh);
 526         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 527         return status;
 528 }
 529
 530 static __be32
 531 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 532                 void *arg)
 533 {
 534         if (!cstate->save_fh.fh_dentry)
 535                 return nfserr_restorefh;
 536
 537         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 538         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 539                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 540                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 541         }
 542         return nfs_ok;
 543 }
 544
 545 static __be32
 546 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 547              void *arg)
 548 {
 549         if (!cstate->current_fh.fh_dentry)
 550                 return nfserr_nofilehandle;
 551
 552         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 553         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 554                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 555                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 556         }
 557         return nfs_ok;
 558 }
 559
 560 /*
 561  * misc nfsv4 ops
 562  */
 563 static __be32
 564 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 565              struct nfsd4_access *access)
 566 {
 567         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 568                 return nfserr_inval;
 569
 570         access->ac_resp_access = access->ac_req_access;
 571         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 572                            &access->ac_supported);
 573 }
 574
 575 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 576 {
 577         __be32 verf[2];
 578         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 579
 580         /*
 581          * This is opaque to client, so no need to byte-swap. Use
 582          * __force to keep sparse happy
 583          */
 584         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 585         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 586         memcpy(verifier->data, verf, sizeof(verifier->data));
 587 }
 588
 589 static __be32
 590 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 591              struct nfsd4_commit *commit)
 592 {
 593         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 594         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 595                              commit->co_count);
 596 }
 597
 598 static __be32
 599 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600              struct nfsd4_create *create)
 601 {
 602         struct svc_fh resfh;
 603         __be32 status;
 604         dev_t rdev;
 605
 606         fh_init(&resfh, NFS4_FHSIZE);
 607
 608         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 609                            NFSD_MAY_CREATE);
 610         if (status)
 611                 return status;
 612
 613         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 614                                     nfsd_attrmask);
 615         if (status)
 616                 return status;
 617
 618         switch (create->cr_type) {
 619         case NF4LNK:
 620                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 621                                       create->cr_name, create->cr_namelen,
 622                                       create->cr_data, &resfh);
 623                 break;
 624
 625         case NF4BLK:
 626                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 627                 if (MAJOR(rdev) != create->cr_specdata1 ||
 628                     MINOR(rdev) != create->cr_specdata2)
 629                         return nfserr_inval;
 630                 status = nfsd_create(rqstp, &cstate->current_fh,
 631                                      create->cr_name, create->cr_namelen,
 632                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 633                 break;
 634
 635         case NF4CHR:
 636                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 637                 if (MAJOR(rdev) != create->cr_specdata1 ||
 638                     MINOR(rdev) != create->cr_specdata2)
 639                         return nfserr_inval;
 640                 status = nfsd_create(rqstp, &cstate->current_fh,
 641                                      create->cr_name, create->cr_namelen,
 642                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 643                 break;
 644
 645         case NF4SOCK:
 646                 status = nfsd_create(rqstp, &cstate->current_fh,
 647                                      create->cr_name, create->cr_namelen,
 648                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 649                 break;
 650
 651         case NF4FIFO:
 652                 status = nfsd_create(rqstp, &cstate->current_fh,
 653                                      create->cr_name, create->cr_namelen,
 654                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 655                 break;
 656
 657         case NF4DIR:
 658                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 659                 status = nfsd_create(rqstp, &cstate->current_fh,
 660                                      create->cr_name, create->cr_namelen,
 661                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 662                 break;
 663
 664         default:
 665                 status = nfserr_badtype;
 666         }
 667
 668         if (status)
 669                 goto out;
 670
 671         if (create->cr_label.len)
 672                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 673
 674         if (create->cr_acl != NULL)
 675                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 676                                 create->cr_bmval);
 677
 678         fh_unlock(&cstate->current_fh);
 679         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 680         fh_dup2(&cstate->current_fh, &resfh);
 681 out:
 682         fh_put(&resfh);
 683         return status;
 684 }
 685
 686 static __be32
 687 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 688               struct nfsd4_getattr *getattr)
 689 {
 690         __be32 status;
 691
 692         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 693         if (status)
 694                 return status;
 695
 696         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 697                 return nfserr_inval;
 698
 699         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 700         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 701         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 702
 703         getattr->ga_fhp = &cstate->current_fh;
 704         return nfs_ok;
 705 }
 706
 707 static __be32
 708 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 709            struct nfsd4_link *link)
 710 {
 711         __be32 status = nfserr_nofilehandle;
 712
 713         if (!cstate->save_fh.fh_dentry)
 714                 return status;
 715         status = nfsd_link(rqstp, &cstate->current_fh,
 716                            link->li_name, link->li_namelen, &cstate->save_fh);
 717         if (!status)
 718                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 719         return status;
 720 }
 721
 722 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 723 {
 724         struct svc_fh tmp_fh;
 725         __be32 ret;
 726
 727         fh_init(&tmp_fh, NFS4_FHSIZE);
 728         ret = exp_pseudoroot(rqstp, &tmp_fh);
 729         if (ret)
 730                 return ret;
 731         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 732                 fh_put(&tmp_fh);
 733                 return nfserr_noent;
 734         }
 735         fh_put(&tmp_fh);
 736         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 737 }
 738
 739 static __be32
 740 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 741               void *arg)
 742 {
 743         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 744 }
 745
 746 static __be32
 747 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 748              struct nfsd4_lookup *lookup)
 749 {
 750         return nfsd_lookup(rqstp, &cstate->current_fh,
 751                            lookup->lo_name, lookup->lo_len,
 752                            &cstate->current_fh);
 753 }
 754
 755 static __be32
 756 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 757            struct nfsd4_read *read)
 758 {
 759         __be32 status;
 760
 761         /* no need to check permission - this will be done in nfsd_read() */
 762
 763         read->rd_filp = NULL;
 764         if (read->rd_offset >= OFFSET_MAX)
 765                 return nfserr_inval;
 766
 767         /*
 768          * If we do a zero copy read, then a client will see read data
 769          * that reflects the state of the file *after* performing the
 770          * following compound.
 771          *
 772          * To ensure proper ordering, we therefore turn off zero copy if
 773          * the client wants us to do more in this compound:
 774          */
 775         if (!nfsd4_last_compound_op(rqstp))
 776                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 777
 778         /* check stateid */
 779         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 780                                                  cstate, &read->rd_stateid,
 781                                                  RD_STATE, &read->rd_filp))) {
 782                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 783                 goto out;
 784         }
 785         status = nfs_ok;
 786 out:
 787         read->rd_rqstp = rqstp;
 788         read->rd_fhp = &cstate->current_fh;
 789         return status;
 790 }
 791
 792 static __be32
 793 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 794               struct nfsd4_readdir *readdir)
 795 {
 796         u64 cookie = readdir->rd_cookie;
 797         static const nfs4_verifier zeroverf;
 798
 799         /* no need to check permission - this will be done in nfsd_readdir() */
 800
 801         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 802                 return nfserr_inval;
 803
 804         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 805         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 806         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 807
 808         if ((cookie == 1) || (cookie == 2) ||
 809             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 810                 return nfserr_bad_cookie;
 811
 812         readdir->rd_rqstp = rqstp;
 813         readdir->rd_fhp = &cstate->current_fh;
 814         return nfs_ok;
 815 }
 816
 817 static __be32
 818 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 819                struct nfsd4_readlink *readlink)
 820 {
 821         readlink->rl_rqstp = rqstp;
 822         readlink->rl_fhp = &cstate->current_fh;
 823         return nfs_ok;
 824 }
 825
 826 static __be32
 827 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 828              struct nfsd4_remove *remove)
 829 {
 830         __be32 status;
 831
 832         if (locks_in_grace(SVC_NET(rqstp)))
 833                 return nfserr_grace;
 834         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 835                              remove->rm_name, remove->rm_namelen);
 836         if (!status) {
 837                 fh_unlock(&cstate->current_fh);
 838                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 839         }
 840         return status;
 841 }
 842
 843 static __be32
 844 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 845              struct nfsd4_rename *rename)
 846 {
 847         __be32 status = nfserr_nofilehandle;
 848
 849         if (!cstate->save_fh.fh_dentry)
 850                 return status;
 851         if (locks_in_grace(SVC_NET(rqstp)) &&
 852                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 853                 return nfserr_grace;
 854         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 855                              rename->rn_snamelen, &cstate->current_fh,
 856                              rename->rn_tname, rename->rn_tnamelen);
 857         if (status)
 858                 return status;
 859         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 860         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 861         return nfs_ok;
 862 }
 863
 864 static __be32
 865 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 866               struct nfsd4_secinfo *secinfo)
 867 {
 868         struct svc_fh resfh;
 869         struct svc_export *exp;
 870         struct dentry *dentry;
 871         __be32 err;
 872
 873         fh_init(&resfh, NFS4_FHSIZE);
 874         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 875         if (err)
 876                 return err;
 877         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 878                                     secinfo->si_name, secinfo->si_namelen,
 879                                     &exp, &dentry);
 880         if (err)
 881                 return err;
 882         if (dentry->d_inode == NULL) {
 883                 exp_put(exp);
 884                 err = nfserr_noent;
 885         } else
 886                 secinfo->si_exp = exp;
 887         dput(dentry);
 888         if (cstate->minorversion)
 889                 /* See rfc 5661 section 2.6.3.1.1.8 */
 890                 fh_put(&cstate->current_fh);
 891         return err;
 892 }
 893
 894 static __be32
 895 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 896               struct nfsd4_secinfo_no_name *sin)
 897 {
 898         __be32 err;
 899
 900         switch (sin->sin_style) {
 901         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 902                 break;
 903         case NFS4_SECINFO_STYLE4_PARENT:
 904                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 905                 if (err)
 906                         return err;
 907                 break;
 908         default:
 909                 return nfserr_inval;
 910         }
 911
 912         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 913         fh_put(&cstate->current_fh);
 914         return nfs_ok;
 915 }
 916
 917 static __be32
 918 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 919               struct nfsd4_setattr *setattr)
 920 {
 921         __be32 status = nfs_ok;
 922         int err;
 923
 924         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 925                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 926                         &setattr->sa_stateid, WR_STATE, NULL);
 927                 if (status) {
 928                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 929                         return status;
 930                 }
 931         }
 932         err = fh_want_write(&cstate->current_fh);
 933         if (err)
 934                 return nfserrno(err);
 935         status = nfs_ok;
 936
 937         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 938                                     nfsd_attrmask);
 939         if (status)
 940                 goto out;
 941
 942         if (setattr->sa_acl != NULL)
 943                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 944                                             setattr->sa_acl);
 945         if (status)
 946                 goto out;
 947         if (setattr->sa_label.len)
 948                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 949                                 &setattr->sa_label);
 950         if (status)
 951                 goto out;
 952         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 953                                 0, (time_t)0);
 954 out:
 955         fh_drop_write(&cstate->current_fh);
 956         return status;
 957 }
 958
 959 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 960 {
 961         int i = 1;
 962         int buflen = write->wr_buflen;
 963
 964         vec[0].iov_base = write->wr_head.iov_base;
 965         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 966         buflen -= vec[0].iov_len;
 967
 968         while (buflen) {
 969                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 970                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 971                 buflen -= vec[i].iov_len;
 972                 i++;
 973         }
 974         return i;
 975 }
 976
 977 static __be32
 978 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 979             struct nfsd4_write *write)
 980 {
 981         stateid_t *stateid = &write->wr_stateid;
 982         struct file *filp = NULL;
 983         __be32 status = nfs_ok;
 984         unsigned long cnt;
 985         int nvecs;
 986
 987         /* no need to check permission - this will be done in nfsd_write() */
 988
 989         if (write->wr_offset >= OFFSET_MAX)
 990                 return nfserr_inval;
 991
 992         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 993                                         cstate, stateid, WR_STATE, &filp);
 994         if (status) {
 995                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 996                 return status;
 997         }
 998
 999         cnt = write->wr_buflen;
1000         write->wr_how_written = write->wr_stable_how;
1001         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1002
1003         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1004         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1005
1006         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1007                              write->wr_offset, rqstp->rq_vec, nvecs,
1008                              &cnt, &write->wr_how_written);
1009         if (filp)
1010                 fput(filp);
1011
1012         write->wr_bytes_written = cnt;
1013
1014         return status;
1015 }
1016
1017 static __be32
1018 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1019                 struct nfsd4_fallocate *fallocate, int flags)
1020 {
1021         __be32 status = nfserr_notsupp;
1022         struct file *file;
1023
1024         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
1025                                             &fallocate->falloc_stateid,
1026                                             WR_STATE, &file);
1027         if (status != nfs_ok) {
1028                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1029                 return status;
1030         }
1031
1032         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1033                                      fallocate->falloc_offset,
1034                                      fallocate->falloc_length,
1035                                      flags);
1036         fput(file);
1037         return status;
1038 }
1039
1040 static __be32
1041 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1042                struct nfsd4_fallocate *fallocate)
1043 {
1044         return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1045 }
1046
1047 static __be32
1048 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1049                  struct nfsd4_fallocate *fallocate)
1050 {
1051         return nfsd4_fallocate(rqstp, cstate, fallocate,
1052                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1053 }
1054
1055 static __be32
1056 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1057                 struct nfsd4_seek *seek)
1058 {
1059         int whence;
1060         __be32 status;
1061         struct file *file;
1062
1063         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
1064                                             &seek->seek_stateid,
1065                                             RD_STATE, &file);
1066         if (status) {
1067                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1068                 return status;
1069         }
1070
1071         switch (seek->seek_whence) {
1072         case NFS4_CONTENT_DATA:
1073                 whence = SEEK_DATA;
1074                 break;
1075         case NFS4_CONTENT_HOLE:
1076                 whence = SEEK_HOLE;
1077                 break;
1078         default:
1079                 status = nfserr_union_notsupp;
1080                 goto out;
1081         }
1082
1083         /*
1084          * Note:  This call does change file->f_pos, but nothing in NFSD
1085          *        should ever file->f_pos.
1086          */
1087         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1088         if (seek->seek_pos < 0)
1089                 status = nfserrno(seek->seek_pos);
1090         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1091                 seek->seek_eof = true;
1092
1093 out:
1094         fput(file);
1095         return status;
1096 }
1097
1098 /* This routine never returns NFS_OK!  If there are no other errors, it
1099  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1100  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1101  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1102  */
1103 static __be32
1104 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1105              struct nfsd4_verify *verify)
1106 {
1107         __be32 *buf, *p;
1108         int count;
1109         __be32 status;
1110
1111         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1112         if (status)
1113                 return status;
1114
1115         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1116         if (status)
1117                 return status;
1118
1119         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1120             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1121                 return nfserr_inval;
1122         if (verify->ve_attrlen & 3)
1123                 return nfserr_inval;
1124
1125         /* count in words:
1126          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1127          */
1128         count = 4 + (verify->ve_attrlen >> 2);
1129         buf = kmalloc(count << 2, GFP_KERNEL);
1130         if (!buf)
1131                 return nfserr_jukebox;
1132
1133         p = buf;
1134         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1135                                     cstate->current_fh.fh_export,
1136                                     cstate->current_fh.fh_dentry,
1137                                     verify->ve_bmval,
1138                                     rqstp, 0);
1139         /*
1140          * If nfsd4_encode_fattr() ran out of space, assume that's because
1141          * the attributes are longer (hence different) than those given:
1142          */
1143         if (status == nfserr_resource)
1144                 status = nfserr_not_same;
1145         if (status)
1146                 goto out_kfree;
1147
1148         /* skip bitmap */
1149         p = buf + 1 + ntohl(buf[0]);
1150         status = nfserr_not_same;
1151         if (ntohl(*p++) != verify->ve_attrlen)
1152                 goto out_kfree;
1153         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1154                 status = nfserr_same;
1155
1156 out_kfree:
1157         kfree(buf);
1158         return status;
1159 }
1160
1161 static __be32
1162 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1163               struct nfsd4_verify *verify)
1164 {
1165         __be32 status;
1166
1167         status = _nfsd4_verify(rqstp, cstate, verify);
1168         return status == nfserr_not_same ? nfs_ok : status;
1169 }
1170
1171 static __be32
1172 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1173              struct nfsd4_verify *verify)
1174 {
1175         __be32 status;
1176
1177         status = _nfsd4_verify(rqstp, cstate, verify);
1178         return status == nfserr_same ? nfs_ok : status;
1179 }
1180
1181 /*
1182  * NULL call.
1183  */
1184 static __be32
1185 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1186 {
1187         return nfs_ok;
1188 }
1189
1190 static inline void nfsd4_increment_op_stats(u32 opnum)
1191 {
1192         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1193                 nfsdstats.nfs4_opcount[opnum]++;
1194 }
1195
1196 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1197                               void *);
1198 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1199 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1200 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1201
1202 enum nfsd4_op_flags {
1203         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1204         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1205         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1206         /* For rfc 5661 section 2.6.3.1.1: */
1207         OP_HANDLES_WRONGSEC = 1 << 3,
1208         OP_IS_PUTFH_LIKE = 1 << 4,
1209         /*
1210          * These are the ops whose result size we estimate before
1211          * encoding, to avoid performing an op then not being able to
1212          * respond or cache a response.  This includes writes and setattrs
1213          * as well as the operations usually called "nonidempotent":
1214          */
1215         OP_MODIFIES_SOMETHING = 1 << 5,
1216         /*
1217          * Cache compounds containing these ops in the xid-based drc:
1218          * We use the DRC for compounds containing non-idempotent
1219          * operations, *except* those that are 4.1-specific (since
1220          * sessions provide their own EOS), and except for stateful
1221          * operations other than setclientid and setclientid_confirm
1222          * (since sequence numbers provide EOS for open, lock, etc in
1223          * the v4.0 case).
1224          */
1225         OP_CACHEME = 1 << 6,
1226         /*
1227          * These are ops which clear current state id.
1228          */
1229         OP_CLEAR_STATEID = 1 << 7,
1230 };
1231
1232 struct nfsd4_operation {
1233         nfsd4op_func op_func;
1234         u32 op_flags;
1235         char *op_name;
1236         /* Try to get response size before operation */
1237         nfsd4op_rsize op_rsize_bop;
1238         stateid_getter op_get_currentstateid;
1239         stateid_setter op_set_currentstateid;
1240 };
1241
1242 static struct nfsd4_operation nfsd4_ops[];
1243
1244 static const char *nfsd4_op_name(unsigned opnum);
1245
1246 /*
1247  * Enforce NFSv4.1 COMPOUND ordering rules:
1248  *
1249  * Also note, enforced elsewhere:
1250  *      - SEQUENCE other than as first op results in
1251  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1252  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1253  *        (Enforced in nfsd4_bind_conn_to_session().)
1254  *      - DESTROY_SESSION must be the final operation in a compound, if
1255  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1256  *        (Enforced in nfsd4_destroy_session().)
1257  */
1258 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1259 {
1260         struct nfsd4_op *op = &args->ops[0];
1261
1262         /* These ordering requirements don't apply to NFSv4.0: */
1263         if (args->minorversion == 0)
1264                 return nfs_ok;
1265         /* This is weird, but OK, not our problem: */
1266         if (args->opcnt == 0)
1267                 return nfs_ok;
1268         if (op->status == nfserr_op_illegal)
1269                 return nfs_ok;
1270         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1271                 return nfserr_op_not_in_session;
1272         if (op->opnum == OP_SEQUENCE)
1273                 return nfs_ok;
1274         if (args->opcnt != 1)
1275                 return nfserr_not_only_op;
1276         return nfs_ok;
1277 }
1278
1279 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1280 {
1281         return &nfsd4_ops[op->opnum];
1282 }
1283
1284 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1285 {
1286         if (op->opnum == OP_ILLEGAL)
1287                 return false;
1288         return OPDESC(op)->op_flags & OP_CACHEME;
1289 }
1290
1291 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1292 {
1293         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1294         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1295         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1296         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1297         struct nfsd4_operation *thisd;
1298         struct nfsd4_operation *nextd;
1299
1300         thisd = OPDESC(this);
1301         /*
1302          * Most ops check wronsec on our own; only the putfh-like ops
1303          * have special rules.
1304          */
1305         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1306                 return false;
1307         /*
1308          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1309          * put-filehandle operation if we're not going to use the
1310          * result:
1311          */
1312         if (argp->opcnt == resp->opcnt)
1313                 return false;
1314         if (next->opnum == OP_ILLEGAL)
1315                 return false;
1316         nextd = OPDESC(next);
1317         /*
1318          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1319          * errors themselves as necessary; others should check for them
1320          * now:
1321          */
1322         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1323 }
1324
1325 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1326                                struct nfsd4_compoundres *resp)
1327 {
1328         struct xdr_stream *xdr = &resp->xdr;
1329         struct xdr_buf *buf = &rqstp->rq_res;
1330         struct kvec *head = buf->head;
1331
1332         xdr->buf = buf;
1333         xdr->iov = head;
1334         xdr->p   = head->iov_base + head->iov_len;
1335         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1336         /* Tail and page_len should be zero at this point: */
1337         buf->len = buf->head[0].iov_len;
1338         xdr->scratch.iov_len = 0;
1339         xdr->page_ptr = buf->pages - 1;
1340         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1341                 - rqstp->rq_auth_slack;
1342 }
1343
1344 /*
1345  * COMPOUND call.
1346  */
1347 static __be32
1348 nfsd4_proc_compound(struct svc_rqst *rqstp,
1349                     struct nfsd4_compoundargs *args,
1350                     struct nfsd4_compoundres *resp)
1351 {
1352         struct nfsd4_op *op;
1353         struct nfsd4_operation *opdesc;
1354         struct nfsd4_compound_state *cstate = &resp->cstate;
1355         struct svc_fh *current_fh = &cstate->current_fh;
1356         struct svc_fh *save_fh = &cstate->save_fh;
1357         __be32          status;
1358
1359         svcxdr_init_encode(rqstp, resp);
1360         resp->tagp = resp->xdr.p;
1361         /* reserve space for: taglen, tag, and opcnt */
1362         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1363         resp->taglen = args->taglen;
1364         resp->tag = args->tag;
1365         resp->rqstp = rqstp;
1366         cstate->minorversion = args->minorversion;
1367         fh_init(current_fh, NFS4_FHSIZE);
1368         fh_init(save_fh, NFS4_FHSIZE);
1369         /*
1370          * Don't use the deferral mechanism for NFSv4; compounds make it
1371          * too hard to avoid non-idempotency problems.
1372          */
1373         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1374
1375         /*
1376          * According to RFC3010, this takes precedence over all other errors.
1377          */
1378         status = nfserr_minor_vers_mismatch;
1379         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1380                 goto out;
1381
1382         status = nfs41_check_op_ordering(args);
1383         if (status) {
1384                 op = &args->ops[0];
1385                 op->status = status;
1386                 goto encode_op;
1387         }
1388
1389         while (!status && resp->opcnt < args->opcnt) {
1390                 op = &args->ops[resp->opcnt++];
1391
1392                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1393                         resp->opcnt, args->opcnt, op->opnum,
1394                         nfsd4_op_name(op->opnum));
1395                 /*
1396                  * The XDR decode routines may have pre-set op->status;
1397                  * for example, if there is a miscellaneous XDR error
1398                  * it will be set to nfserr_bad_xdr.
1399                  */
1400                 if (op->status) {
1401                         if (op->opnum == OP_OPEN)
1402                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1403                         goto encode_op;
1404                 }
1405
1406                 opdesc = OPDESC(op);
1407
1408                 if (!current_fh->fh_dentry) {
1409                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1410                                 op->status = nfserr_nofilehandle;
1411                                 goto encode_op;
1412                         }
1413                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1414                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1415                         op->status = nfserr_moved;
1416                         goto encode_op;
1417                 }
1418
1419                 fh_clear_wcc(current_fh);
1420
1421                 /* If op is non-idempotent */
1422                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1423                         /*
1424                          * Don't execute this op if we couldn't encode a
1425                          * succesful reply:
1426                          */
1427                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1428                         /*
1429                          * Plus if there's another operation, make sure
1430                          * we'll have space to at least encode an error:
1431                          */
1432                         if (resp->opcnt < args->opcnt)
1433                                 plen += COMPOUND_ERR_SLACK_SPACE;
1434                         op->status = nfsd4_check_resp_size(resp, plen);
1435                 }
1436
1437                 if (op->status)
1438                         goto encode_op;
1439
1440                 if (opdesc->op_get_currentstateid)
1441                         opdesc->op_get_currentstateid(cstate, &op->u);
1442                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1443
1444                 if (!op->status) {
1445                         if (opdesc->op_set_currentstateid)
1446                                 opdesc->op_set_currentstateid(cstate, &op->u);
1447
1448                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1449                                 clear_current_stateid(cstate);
1450
1451                         if (need_wrongsec_check(rqstp))
1452                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1453                 }
1454
1455 encode_op:
1456                 /* Only from SEQUENCE */
1457                 if (cstate->status == nfserr_replay_cache) {
1458                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1459                         status = op->status;
1460                         goto out;
1461                 }
1462                 if (op->status == nfserr_replay_me) {
1463                         op->replay = &cstate->replay_owner->so_replay;
1464                         nfsd4_encode_replay(&resp->xdr, op);
1465                         status = op->status = op->replay->rp_status;
1466                 } else {
1467                         nfsd4_encode_operation(resp, op);
1468                         status = op->status;
1469                 }
1470
1471                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1472                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1473                         be32_to_cpu(status));
1474
1475                 nfsd4_cstate_clear_replay(cstate);
1476                 /* XXX Ugh, we need to get rid of this kind of special case: */
1477                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1478                         fput(op->u.read.rd_filp);
1479
1480                 nfsd4_increment_op_stats(op->opnum);
1481         }
1482
1483         cstate->status = status;
1484         fh_put(current_fh);
1485         fh_put(save_fh);
1486         BUG_ON(cstate->replay_owner);
1487 out:
1488         /* Reset deferral mechanism for RPC deferrals */
1489         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1490         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1491         return status;
1492 }
1493
1494 #define op_encode_hdr_size              (2)
1495 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1496 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1497 #define op_encode_change_info_maxsz     (5)
1498 #define nfs4_fattr_bitmap_maxsz         (4)
1499
1500 /* We'll fall back on returning no lockowner if run out of space: */
1501 #define op_encode_lockowner_maxsz       (0)
1502 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1503
1504 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1505
1506 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1507 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1508                                          op_encode_ace_maxsz)
1509
1510 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1511
1512 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1513 {
1514         return (op_encode_hdr_size) * sizeof(__be32);
1515 }
1516
1517 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1518 {
1519         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1520 }
1521
1522 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1523 {
1524         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1525 }
1526
1527 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1528 {
1529         return (op_encode_hdr_size + op_encode_change_info_maxsz
1530                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1531 }
1532
1533 /*
1534  * Note since this is an idempotent operation we won't insist on failing
1535  * the op prematurely if the estimate is too large.  We may turn off splice
1536  * reads unnecessarily.
1537  */
1538 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1539                                       struct nfsd4_op *op)
1540 {
1541         u32 *bmap = op->u.getattr.ga_bmval;
1542         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1543         u32 ret = 0;
1544
1545         if (bmap0 & FATTR4_WORD0_ACL)
1546                 return svc_max_payload(rqstp);
1547         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1548                 return svc_max_payload(rqstp);
1549
1550         if (bmap1 & FATTR4_WORD1_OWNER) {
1551                 ret += IDMAP_NAMESZ + 4;
1552                 bmap1 &= ~FATTR4_WORD1_OWNER;
1553         }
1554         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1555                 ret += IDMAP_NAMESZ + 4;
1556                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1557         }
1558         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1559                 ret += NFS4_FHSIZE + 4;
1560                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1561         }
1562         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1563                 ret += NFSD4_MAX_SEC_LABEL_LEN + 12;
1564                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1565         }
1566         /*
1567          * Largest of remaining attributes are 16 bytes (e.g.,
1568          * supported_attributes)
1569          */
1570         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1571         /* bitmask, length */
1572         ret += 20;
1573         return ret;
1574 }
1575
1576 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1577 {
1578         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1579                 * sizeof(__be32);
1580 }
1581
1582 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1583 {
1584         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1585                 * sizeof(__be32);
1586 }
1587
1588 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1589 {
1590         return (op_encode_hdr_size + op_encode_stateid_maxsz
1591                 + op_encode_change_info_maxsz + 1
1592                 + nfs4_fattr_bitmap_maxsz
1593                 + op_encode_delegation_maxsz) * sizeof(__be32);
1594 }
1595
1596 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1597 {
1598         u32 maxcount = 0, rlen = 0;
1599
1600         maxcount = svc_max_payload(rqstp);
1601         rlen = min(op->u.read.rd_length, maxcount);
1602
1603         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1604 }
1605
1606 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1607 {
1608         u32 maxcount = 0, rlen = 0;
1609
1610         maxcount = svc_max_payload(rqstp);
1611         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1612
1613         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1614                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1615 }
1616
1617 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1618 {
1619         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1620                 * sizeof(__be32);
1621 }
1622
1623 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1624 {
1625         return (op_encode_hdr_size + op_encode_change_info_maxsz
1626                 + op_encode_change_info_maxsz) * sizeof(__be32);
1627 }
1628
1629 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1630                                        struct nfsd4_op *op)
1631 {
1632         return (op_encode_hdr_size
1633                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1634 }
1635
1636 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1637 {
1638         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1639 }
1640
1641 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1642 {
1643         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1644                                                                 sizeof(__be32);
1645 }
1646
1647 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1648 {
1649         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1650 }
1651
1652 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1653 {
1654         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1655                 1 + 1 + /* eir_flags, spr_how */\
1656                 4 + /* spo_must_enforce & _allow with bitmap */\
1657                 2 + /*eir_server_owner.so_minor_id */\
1658                 /* eir_server_owner.so_major_id<> */\
1659                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1660                 /* eir_server_scope<> */\
1661                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1662                 1 + /* eir_server_impl_id array length */\
1663                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1664 }
1665
1666 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1667 {
1668         return (op_encode_hdr_size + \
1669                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1670                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1671 }
1672
1673 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1674 {
1675         return (op_encode_hdr_size + \
1676                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1677                 2 + /* csr_sequence, csr_flags */\
1678                 op_encode_channel_attrs_maxsz + \
1679                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1680 }
1681
1682 static struct nfsd4_operation nfsd4_ops[] = {
1683         [OP_ACCESS] = {
1684                 .op_func = (nfsd4op_func)nfsd4_access,
1685                 .op_name = "OP_ACCESS",
1686         },
1687         [OP_CLOSE] = {
1688                 .op_func = (nfsd4op_func)nfsd4_close,
1689                 .op_flags = OP_MODIFIES_SOMETHING,
1690                 .op_name = "OP_CLOSE",
1691                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1692                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1693                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1694         },
1695         [OP_COMMIT] = {
1696                 .op_func = (nfsd4op_func)nfsd4_commit,
1697                 .op_flags = OP_MODIFIES_SOMETHING,
1698                 .op_name = "OP_COMMIT",
1699                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1700         },
1701         [OP_CREATE] = {
1702                 .op_func = (nfsd4op_func)nfsd4_create,
1703                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1704                 .op_name = "OP_CREATE",
1705                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1706         },
1707         [OP_DELEGRETURN] = {
1708                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1709                 .op_flags = OP_MODIFIES_SOMETHING,
1710                 .op_name = "OP_DELEGRETURN",
1711                 .op_rsize_bop = nfsd4_only_status_rsize,
1712                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1713         },
1714         [OP_GETATTR] = {
1715                 .op_func = (nfsd4op_func)nfsd4_getattr,
1716                 .op_flags = ALLOWED_ON_ABSENT_FS,
1717                 .op_rsize_bop = nfsd4_getattr_rsize,
1718                 .op_name = "OP_GETATTR",
1719         },
1720         [OP_GETFH] = {
1721                 .op_func = (nfsd4op_func)nfsd4_getfh,
1722                 .op_name = "OP_GETFH",
1723         },
1724         [OP_LINK] = {
1725                 .op_func = (nfsd4op_func)nfsd4_link,
1726                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1727                                 | OP_CACHEME,
1728                 .op_name = "OP_LINK",
1729                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1730         },
1731         [OP_LOCK] = {
1732                 .op_func = (nfsd4op_func)nfsd4_lock,
1733                 .op_flags = OP_MODIFIES_SOMETHING,
1734                 .op_name = "OP_LOCK",
1735                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1736                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1737         },
1738         [OP_LOCKT] = {
1739                 .op_func = (nfsd4op_func)nfsd4_lockt,
1740                 .op_name = "OP_LOCKT",
1741         },
1742         [OP_LOCKU] = {
1743                 .op_func = (nfsd4op_func)nfsd4_locku,
1744                 .op_flags = OP_MODIFIES_SOMETHING,
1745                 .op_name = "OP_LOCKU",
1746                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1747                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1748         },
1749         [OP_LOOKUP] = {
1750                 .op_func = (nfsd4op_func)nfsd4_lookup,
1751                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1752                 .op_name = "OP_LOOKUP",
1753         },
1754         [OP_LOOKUPP] = {
1755                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1756                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1757                 .op_name = "OP_LOOKUPP",
1758         },
1759         [OP_NVERIFY] = {
1760                 .op_func = (nfsd4op_func)nfsd4_nverify,
1761                 .op_name = "OP_NVERIFY",
1762         },
1763         [OP_OPEN] = {
1764                 .op_func = (nfsd4op_func)nfsd4_open,
1765                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1766                 .op_name = "OP_OPEN",
1767                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1768                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1769         },
1770         [OP_OPEN_CONFIRM] = {
1771                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1772                 .op_flags = OP_MODIFIES_SOMETHING,
1773                 .op_name = "OP_OPEN_CONFIRM",
1774                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1775         },
1776         [OP_OPEN_DOWNGRADE] = {
1777                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1778                 .op_flags = OP_MODIFIES_SOMETHING,
1779                 .op_name = "OP_OPEN_DOWNGRADE",
1780                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1781                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1782                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1783         },
1784         [OP_PUTFH] = {
1785                 .op_func = (nfsd4op_func)nfsd4_putfh,
1786                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1787                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1788                 .op_name = "OP_PUTFH",
1789                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1790         },
1791         [OP_PUTPUBFH] = {
1792                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1793                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1794                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1795                 .op_name = "OP_PUTPUBFH",
1796                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1797         },
1798         [OP_PUTROOTFH] = {
1799                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1800                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1801                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1802                 .op_name = "OP_PUTROOTFH",
1803                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1804         },
1805         [OP_READ] = {
1806                 .op_func = (nfsd4op_func)nfsd4_read,
1807                 .op_name = "OP_READ",
1808                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1809                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1810         },
1811         [OP_READDIR] = {
1812                 .op_func = (nfsd4op_func)nfsd4_readdir,
1813                 .op_name = "OP_READDIR",
1814                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1815         },
1816         [OP_READLINK] = {
1817                 .op_func = (nfsd4op_func)nfsd4_readlink,
1818                 .op_name = "OP_READLINK",
1819         },
1820         [OP_REMOVE] = {
1821                 .op_func = (nfsd4op_func)nfsd4_remove,
1822                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1823                 .op_name = "OP_REMOVE",
1824                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1825         },
1826         [OP_RENAME] = {
1827                 .op_func = (nfsd4op_func)nfsd4_rename,
1828                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1829                 .op_name = "OP_RENAME",
1830                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1831         },
1832         [OP_RENEW] = {
1833                 .op_func = (nfsd4op_func)nfsd4_renew,
1834                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1835                                 | OP_MODIFIES_SOMETHING,
1836                 .op_name = "OP_RENEW",
1837                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1838
1839         },
1840         [OP_RESTOREFH] = {
1841                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1842                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1843                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1844                 .op_name = "OP_RESTOREFH",
1845                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1846         },
1847         [OP_SAVEFH] = {
1848                 .op_func = (nfsd4op_func)nfsd4_savefh,
1849                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1850                 .op_name = "OP_SAVEFH",
1851                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1852         },
1853         [OP_SECINFO] = {
1854                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1855                 .op_flags = OP_HANDLES_WRONGSEC,
1856                 .op_name = "OP_SECINFO",
1857         },
1858         [OP_SETATTR] = {
1859                 .op_func = (nfsd4op_func)nfsd4_setattr,
1860                 .op_name = "OP_SETATTR",
1861                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1862                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1863                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1864         },
1865         [OP_SETCLIENTID] = {
1866                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1867                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1868                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1869                 .op_name = "OP_SETCLIENTID",
1870                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1871         },
1872         [OP_SETCLIENTID_CONFIRM] = {
1873                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1874                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1875                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1876                 .op_name = "OP_SETCLIENTID_CONFIRM",
1877                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1878         },
1879         [OP_VERIFY] = {
1880                 .op_func = (nfsd4op_func)nfsd4_verify,
1881                 .op_name = "OP_VERIFY",
1882         },
1883         [OP_WRITE] = {
1884                 .op_func = (nfsd4op_func)nfsd4_write,
1885                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1886                 .op_name = "OP_WRITE",
1887                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1888                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1889         },
1890         [OP_RELEASE_LOCKOWNER] = {
1891                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1892                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1893                                 | OP_MODIFIES_SOMETHING,
1894                 .op_name = "OP_RELEASE_LOCKOWNER",
1895                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1896         },
1897
1898         /* NFSv4.1 operations */
1899         [OP_EXCHANGE_ID] = {
1900                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1901                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1902                                 | OP_MODIFIES_SOMETHING,
1903                 .op_name = "OP_EXCHANGE_ID",
1904                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1905         },
1906         [OP_BACKCHANNEL_CTL] = {
1907                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1908                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1909                 .op_name = "OP_BACKCHANNEL_CTL",
1910                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1911         },
1912         [OP_BIND_CONN_TO_SESSION] = {
1913                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1914                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1915                                 | OP_MODIFIES_SOMETHING,
1916                 .op_name = "OP_BIND_CONN_TO_SESSION",
1917                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1918         },
1919         [OP_CREATE_SESSION] = {
1920                 .op_func = (nfsd4op_func)nfsd4_create_session,
1921                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1922                                 | OP_MODIFIES_SOMETHING,
1923                 .op_name = "OP_CREATE_SESSION",
1924                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1925         },
1926         [OP_DESTROY_SESSION] = {
1927                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1928                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1929                                 | OP_MODIFIES_SOMETHING,
1930                 .op_name = "OP_DESTROY_SESSION",
1931                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1932         },
1933         [OP_SEQUENCE] = {
1934                 .op_func = (nfsd4op_func)nfsd4_sequence,
1935                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1936                 .op_name = "OP_SEQUENCE",
1937                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
1938         },
1939         [OP_DESTROY_CLIENTID] = {
1940                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1941                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1942                                 | OP_MODIFIES_SOMETHING,
1943                 .op_name = "OP_DESTROY_CLIENTID",
1944                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1945         },
1946         [OP_RECLAIM_COMPLETE] = {
1947                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1948                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1949                 .op_name = "OP_RECLAIM_COMPLETE",
1950                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1951         },
1952         [OP_SECINFO_NO_NAME] = {
1953                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1954                 .op_flags = OP_HANDLES_WRONGSEC,
1955                 .op_name = "OP_SECINFO_NO_NAME",
1956         },
1957         [OP_TEST_STATEID] = {
1958                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1959                 .op_flags = ALLOWED_WITHOUT_FH,
1960                 .op_name = "OP_TEST_STATEID",
1961         },
1962         [OP_FREE_STATEID] = {
1963                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1964                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1965                 .op_name = "OP_FREE_STATEID",
1966                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1967                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1968         },
1969
1970         /* NFSv4.2 operations */
1971         [OP_ALLOCATE] = {
1972                 .op_func = (nfsd4op_func)nfsd4_allocate,
1973                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1974                 .op_name = "OP_ALLOCATE",
1975                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1976         },
1977         [OP_DEALLOCATE] = {
1978                 .op_func = (nfsd4op_func)nfsd4_deallocate,
1979                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1980                 .op_name = "OP_DEALLOCATE",
1981                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1982         },
1983         [OP_SEEK] = {
1984                 .op_func = (nfsd4op_func)nfsd4_seek,
1985                 .op_name = "OP_SEEK",
1986         },
1987 };
1988
1989 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
1990 {
1991         struct nfsd4_operation *opdesc;
1992         nfsd4op_rsize estimator;
1993
1994         if (op->opnum == OP_ILLEGAL)
1995                 return op_encode_hdr_size * sizeof(__be32);
1996         opdesc = OPDESC(op);
1997         estimator = opdesc->op_rsize_bop;
1998         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
1999 }
2000
2001 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2002 {
2003         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2004                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2005                         op->opnum, nfsd4_op_name(op->opnum));
2006                 WARN_ON_ONCE(1);
2007         }
2008 }
2009
2010 static const char *nfsd4_op_name(unsigned opnum)
2011 {
2012         if (opnum < ARRAY_SIZE(nfsd4_ops))
2013                 return nfsd4_ops[opnum].op_name;
2014         return "unknown_operation";
2015 }
2016
2017 #define nfsd4_voidres                   nfsd4_voidargs
2018 struct nfsd4_voidargs { int dummy; };
2019
2020 static struct svc_procedure             nfsd_procedures4[2] = {
2021         [NFSPROC4_NULL] = {
2022                 .pc_func = (svc_procfunc) nfsd4_proc_null,
2023                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2024                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2025                 .pc_ressize = sizeof(struct nfsd4_voidres),
2026                 .pc_cachetype = RC_NOCACHE,
2027                 .pc_xdrressize = 1,
2028         },
2029         [NFSPROC4_COMPOUND] = {
2030                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
2031                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2032                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2033                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2034                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2035                 .pc_release = nfsd4_release_compoundargs,
2036                 .pc_cachetype = RC_NOCACHE,
2037                 .pc_xdrressize = NFSD_BUFSIZE/4,
2038         },
2039 };
2040
2041 struct svc_version      nfsd_version4 = {
2042                 .vs_vers        = 4,
2043                 .vs_nproc       = 2,
2044                 .vs_proc        = nfsd_procedures4,
2045                 .vs_dispatch    = nfsd_dispatch,
2046                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
2047                 .vs_rpcb_optnl  = 1,
2048 };
2049
2050 /*
2051  * Local variables:
2052  *  c-basic-offset: 8
2053  * End:
2054  */