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/fs_struct.h>
  36 #include <linux/file.h>
  37 #include <linux/falloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/kthread.h>
  40
  41 #include "idmap.h"
  42 #include "cache.h"
  43 #include "xdr4.h"
  44 #include "vfs.h"
  45 #include "current_stateid.h"
  46 #include "netns.h"
  47 #include "acl.h"
  48 #include "pnfs.h"
  49 #include "trace.h"
  50
  51 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  52 #include <linux/security.h>
  53
  54 static inline void
  55 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  56 {
  57         struct inode *inode = d_inode(resfh->fh_dentry);
  58         int status;
  59
  60         inode_lock(inode);
  61         status = security_inode_setsecctx(resfh->fh_dentry,
  62                 label->data, label->len);
  63         inode_unlock(inode);
  64
  65         if (status)
  66                 /*
  67                  * XXX: We should really fail the whole open, but we may
  68                  * already have created a new file, so it may be too
  69                  * late.  For now this seems the least of evils:
  70                  */
  71                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  72
  73         return;
  74 }
  75 #else
  76 static inline void
  77 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  78 { }
  79 #endif
  80
  81 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  82
  83 static u32 nfsd_attrmask[] = {
  84         NFSD_WRITEABLE_ATTRS_WORD0,
  85         NFSD_WRITEABLE_ATTRS_WORD1,
  86         NFSD_WRITEABLE_ATTRS_WORD2
  87 };
  88
  89 static u32 nfsd41_ex_attrmask[] = {
  90         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  91         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  92         NFSD_SUPPATTR_EXCLCREAT_WORD2
  93 };
  94
  95 static __be32
  96 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  97                    u32 *bmval, u32 *writable)
  98 {
  99         struct dentry *dentry = cstate->current_fh.fh_dentry;
 100         struct svc_export *exp = cstate->current_fh.fh_export;
 101
 102         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
 103                 return nfserr_attrnotsupp;
 104         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
 105                 return nfserr_attrnotsupp;
 106         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
 107                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
 108                 return nfserr_attrnotsupp;
 109         if (writable && !bmval_is_subset(bmval, writable))
 110                 return nfserr_inval;
 111         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
 112                         (bmval[1] & FATTR4_WORD1_MODE))
 113                 return nfserr_inval;
 114         return nfs_ok;
 115 }
 116
 117 static __be32
 118 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 119         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 120 {
 121         __be32 status = nfs_ok;
 122
 123         if (open->op_create == NFS4_OPEN_CREATE) {
 124                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 125                     || open->op_createmode == NFS4_CREATE_GUARDED)
 126                         status = check_attr_support(rqstp, cstate,
 127                                         open->op_bmval, nfsd_attrmask);
 128                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 129                         status = check_attr_support(rqstp, cstate,
 130                                         open->op_bmval, nfsd41_ex_attrmask);
 131         }
 132
 133         return status;
 134 }
 135
 136 static int
 137 is_create_with_attrs(struct nfsd4_open *open)
 138 {
 139         return open->op_create == NFS4_OPEN_CREATE
 140                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 141                     || open->op_createmode == NFS4_CREATE_GUARDED
 142                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 143 }
 144
 145 /*
 146  * if error occurs when setting the acl, just clear the acl bit
 147  * in the returned attr bitmap.
 148  */
 149 static void
 150 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 151                 struct nfs4_acl *acl, u32 *bmval)
 152 {
 153         __be32 status;
 154
 155         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 156         if (status)
 157                 /*
 158                  * We should probably fail the whole open at this point,
 159                  * but we've already created the file, so it's too late;
 160                  * So this seems the least of evils:
 161                  */
 162                 bmval[0] &= ~FATTR4_WORD0_ACL;
 163 }
 164
 165 static inline void
 166 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 167 {
 168         fh_put(dst);
 169         dget(src->fh_dentry);
 170         if (src->fh_export)
 171                 exp_get(src->fh_export);
 172         *dst = *src;
 173 }
 174
 175 static __be32
 176 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 177 {
 178         __be32 status;
 179
 180         if (open->op_truncate &&
 181                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 182                 return nfserr_inval;
 183
 184         accmode |= NFSD_MAY_READ_IF_EXEC;
 185
 186         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 187                 accmode |= NFSD_MAY_READ;
 188         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 189                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 190         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 191                 accmode |= NFSD_MAY_WRITE;
 192
 193         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 194
 195         return status;
 196 }
 197
 198 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 199 {
 200         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 201
 202         if (S_ISREG(mode))
 203                 return nfs_ok;
 204         if (S_ISDIR(mode))
 205                 return nfserr_isdir;
 206         /*
 207          * Using err_symlink as our catch-all case may look odd; but
 208          * there's no other obvious error for this case in 4.0, and we
 209          * happen to know that it will cause the linux v4 client to do
 210          * the right thing on attempts to open something other than a
 211          * regular file.
 212          */
 213         return nfserr_symlink;
 214 }
 215
 216 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 217 {
 218         if (nfsd4_has_session(cstate))
 219                 return;
 220         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 221                         &resfh->fh_handle);
 222 }
 223
 224 static __be32
 225 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 226 {
 227         struct svc_fh *current_fh = &cstate->current_fh;
 228         int accmode;
 229         __be32 status;
 230
 231         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 232         if (!*resfh)
 233                 return nfserr_jukebox;
 234         fh_init(*resfh, NFS4_FHSIZE);
 235         open->op_truncate = 0;
 236
 237         if (open->op_create) {
 238                 /* FIXME: check session persistence and pnfs flags.
 239                  * The nfsv4.1 spec requires the following semantics:
 240                  *
 241                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 242                  * Reply Cache  | server |                 |
 243                  * -------------+--------+-----------------+--------------------
 244                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 245                  *              |        |                 | (SHOULD)
 246                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 247                  *              |        |                 | (SHOULD NOT)
 248                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 249                  * yes          | no     | GUARDED4        | GUARDED4
 250                  * yes          | yes    | GUARDED4        | GUARDED4
 251                  */
 252
 253                 /*
 254                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 255                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 256                  */
 257                 current->fs->umask = open->op_umask;
 258                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 259                                         open->op_fname.len, &open->op_iattr,
 260                                         *resfh, open->op_createmode,
 261                                         (u32 *)open->op_verf.data,
 262                                         &open->op_truncate, &open->op_created);
 263                 current->fs->umask = 0;
 264
 265                 if (!status && open->op_label.len)
 266                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 267
 268                 /*
 269                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 270                  * use the returned bitmask to indicate which attributes
 271                  * we used to store the verifier:
 272                  */
 273                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 274                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 275                                                 FATTR4_WORD1_TIME_MODIFY);
 276         } else
 277                 /*
 278                  * Note this may exit with the parent still locked.
 279                  * We will hold the lock until nfsd4_open's final
 280                  * lookup, to prevent renames or unlinks until we've had
 281                  * a chance to an acquire a delegation if appropriate.
 282                  */
 283                 status = nfsd_lookup(rqstp, current_fh,
 284                                      open->op_fname.data, open->op_fname.len, *resfh);
 285         if (status)
 286                 goto out;
 287         status = nfsd_check_obj_isreg(*resfh);
 288         if (status)
 289                 goto out;
 290
 291         if (is_create_with_attrs(open) && open->op_acl != NULL)
 292                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 293
 294         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 295         accmode = NFSD_MAY_NOP;
 296         if (open->op_created ||
 297                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 298                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 299         status = do_open_permission(rqstp, *resfh, open, accmode);
 300         set_change_info(&open->op_cinfo, current_fh);
 301 out:
 302         return status;
 303 }
 304
 305 static __be32
 306 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 307 {
 308         struct svc_fh *current_fh = &cstate->current_fh;
 309         __be32 status;
 310         int accmode = 0;
 311
 312         /* We don't know the target directory, and therefore can not
 313         * set the change info
 314         */
 315
 316         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 317
 318         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 319
 320         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 321                 (open->op_iattr.ia_size == 0);
 322         /*
 323          * In the delegation case, the client is telling us about an
 324          * open that it *already* performed locally, some time ago.  We
 325          * should let it succeed now if possible.
 326          *
 327          * In the case of a CLAIM_FH open, on the other hand, the client
 328          * may be counting on us to enforce permissions (the Linux 4.1
 329          * client uses this for normal opens, for example).
 330          */
 331         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 332                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 333
 334         status = do_open_permission(rqstp, current_fh, open, accmode);
 335
 336         return status;
 337 }
 338
 339 static void
 340 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 341 {
 342         struct nfsd4_sessionid *sid =
 343                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 344
 345         clid->cl_boot = sid->clientid.cl_boot;
 346         clid->cl_id = sid->clientid.cl_id;
 347 }
 348
 349 static __be32
 350 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 351            union nfsd4_op_u *u)
 352 {
 353         struct nfsd4_open *open = &u->open;
 354         __be32 status;
 355         struct svc_fh *resfh = NULL;
 356         struct net *net = SVC_NET(rqstp);
 357         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 358         bool reclaim = false;
 359
 360         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 361                 (int)open->op_fname.len, open->op_fname.data,
 362                 open->op_openowner);
 363
 364         /* This check required by spec. */
 365         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 366                 return nfserr_inval;
 367
 368         open->op_created = 0;
 369         /*
 370          * RFC5661 18.51.3
 371          * Before RECLAIM_COMPLETE done, server should deny new lock
 372          */
 373         if (nfsd4_has_session(cstate) &&
 374             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 375                       &cstate->session->se_client->cl_flags) &&
 376             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 377                 return nfserr_grace;
 378
 379         if (nfsd4_has_session(cstate))
 380                 copy_clientid(&open->op_clientid, cstate->session);
 381
 382         /* check seqid for replay. set nfs4_owner */
 383         status = nfsd4_process_open1(cstate, open, nn);
 384         if (status == nfserr_replay_me) {
 385                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 386                 fh_put(&cstate->current_fh);
 387                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 388                                 &rp->rp_openfh);
 389                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 390                 if (status)
 391                         dprintk("nfsd4_open: replay failed"
 392                                 " restoring previous filehandle\n");
 393                 else
 394                         status = nfserr_replay_me;
 395         }
 396         if (status)
 397                 goto out;
 398         if (open->op_xdr_error) {
 399                 status = open->op_xdr_error;
 400                 goto out;
 401         }
 402
 403         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 404         if (status)
 405                 goto out;
 406
 407         /* Openowner is now set, so sequence id will get bumped.  Now we need
 408          * these checks before we do any creates: */
 409         status = nfserr_grace;
 410         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 411                 goto out;
 412         status = nfserr_no_grace;
 413         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 414                 goto out;
 415
 416         switch (open->op_claim_type) {
 417                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 418                 case NFS4_OPEN_CLAIM_NULL:
 419                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 420                         if (status)
 421                                 goto out;
 422                         break;
 423                 case NFS4_OPEN_CLAIM_PREVIOUS:
 424                         status = nfs4_check_open_reclaim(&open->op_clientid,
 425                                                          cstate, nn);
 426                         if (status)
 427                                 goto out;
 428                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 429                         reclaim = true;
 430                 case NFS4_OPEN_CLAIM_FH:
 431                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 432                         status = do_open_fhandle(rqstp, cstate, open);
 433                         if (status)
 434                                 goto out;
 435                         resfh = &cstate->current_fh;
 436                         break;
 437                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 438                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 439                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 440                                 open->op_claim_type);
 441                         status = nfserr_notsupp;
 442                         goto out;
 443                 default:
 444                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 445                                 open->op_claim_type);
 446                         status = nfserr_inval;
 447                         goto out;
 448         }
 449         /*
 450          * nfsd4_process_open2() does the actual opening of the file.  If
 451          * successful, it (1) truncates the file if open->op_truncate was
 452          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 453          */
 454         status = nfsd4_process_open2(rqstp, resfh, open);
 455         WARN(status && open->op_created,
 456              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 457              be32_to_cpu(status));
 458         if (reclaim && !status)
 459                 nn->somebody_reclaimed = true;
 460 out:
 461         if (resfh && resfh != &cstate->current_fh) {
 462                 fh_dup2(&cstate->current_fh, resfh);
 463                 fh_put(resfh);
 464                 kfree(resfh);
 465         }
 466         nfsd4_cleanup_open_state(cstate, open);
 467         nfsd4_bump_seqid(cstate, status);
 468         return status;
 469 }
 470
 471 /*
 472  * OPEN is the only seqid-mutating operation whose decoding can fail
 473  * with a seqid-mutating error (specifically, decoding of user names in
 474  * the attributes).  Therefore we have to do some processing to look up
 475  * the stateowner so that we can bump the seqid.
 476  */
 477 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 478 {
 479         struct nfsd4_open *open = &op->u.open;
 480
 481         if (!seqid_mutating_err(ntohl(op->status)))
 482                 return op->status;
 483         if (nfsd4_has_session(cstate))
 484                 return op->status;
 485         open->op_xdr_error = op->status;
 486         return nfsd4_open(rqstp, cstate, &op->u);
 487 }
 488
 489 /*
 490  * filehandle-manipulating ops.
 491  */
 492 static __be32
 493 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 494             union nfsd4_op_u *u)
 495 {
 496         u->getfh = &cstate->current_fh;
 497         return nfs_ok;
 498 }
 499
 500 static __be32
 501 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 502             union nfsd4_op_u *u)
 503 {
 504         struct nfsd4_putfh *putfh = &u->putfh;
 505
 506         fh_put(&cstate->current_fh);
 507         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 508         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 509                putfh->pf_fhlen);
 510         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 511 }
 512
 513 static __be32
 514 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 515                 union nfsd4_op_u *u)
 516 {
 517         __be32 status;
 518
 519         fh_put(&cstate->current_fh);
 520         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 521         return status;
 522 }
 523
 524 static __be32
 525 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 526                 union nfsd4_op_u *u)
 527 {
 528         if (!cstate->save_fh.fh_dentry)
 529                 return nfserr_restorefh;
 530
 531         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 532         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 533                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 534                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 535         }
 536         return nfs_ok;
 537 }
 538
 539 static __be32
 540 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 541              union nfsd4_op_u *u)
 542 {
 543         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 544         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 545                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 546                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 547         }
 548         return nfs_ok;
 549 }
 550
 551 /*
 552  * misc nfsv4 ops
 553  */
 554 static __be32
 555 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 556              union nfsd4_op_u *u)
 557 {
 558         struct nfsd4_access *access = &u->access;
 559
 560         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 561                 return nfserr_inval;
 562
 563         access->ac_resp_access = access->ac_req_access;
 564         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 565                            &access->ac_supported);
 566 }
 567
 568 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 569 {
 570         __be32 verf[2];
 571         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 572
 573         /*
 574          * This is opaque to client, so no need to byte-swap. Use
 575          * __force to keep sparse happy. y2038 time_t overflow is
 576          * irrelevant in this usage.
 577          */
 578         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 579         verf[1] = (__force __be32)nn->nfssvc_boot.tv_nsec;
 580         memcpy(verifier->data, verf, sizeof(verifier->data));
 581 }
 582
 583 static __be32
 584 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 585              union nfsd4_op_u *u)
 586 {
 587         struct nfsd4_commit *commit = &u->commit;
 588
 589         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 590         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 591                              commit->co_count);
 592 }
 593
 594 static __be32
 595 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 596              union nfsd4_op_u *u)
 597 {
 598         struct nfsd4_create *create = &u->create;
 599         struct svc_fh resfh;
 600         __be32 status;
 601         dev_t rdev;
 602
 603         fh_init(&resfh, NFS4_FHSIZE);
 604
 605         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 606         if (status)
 607                 return status;
 608
 609         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 610                                     nfsd_attrmask);
 611         if (status)
 612                 return status;
 613
 614         current->fs->umask = create->cr_umask;
 615         switch (create->cr_type) {
 616         case NF4LNK:
 617                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 618                                       create->cr_name, create->cr_namelen,
 619                                       create->cr_data, &resfh);
 620                 break;
 621
 622         case NF4BLK:
 623                 status = nfserr_inval;
 624                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 625                 if (MAJOR(rdev) != create->cr_specdata1 ||
 626                     MINOR(rdev) != create->cr_specdata2)
 627                         goto out_umask;
 628                 status = nfsd_create(rqstp, &cstate->current_fh,
 629                                      create->cr_name, create->cr_namelen,
 630                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 631                 break;
 632
 633         case NF4CHR:
 634                 status = nfserr_inval;
 635                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 636                 if (MAJOR(rdev) != create->cr_specdata1 ||
 637                     MINOR(rdev) != create->cr_specdata2)
 638                         goto out_umask;
 639                 status = nfsd_create(rqstp, &cstate->current_fh,
 640                                      create->cr_name, create->cr_namelen,
 641                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 642                 break;
 643
 644         case NF4SOCK:
 645                 status = nfsd_create(rqstp, &cstate->current_fh,
 646                                      create->cr_name, create->cr_namelen,
 647                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 648                 break;
 649
 650         case NF4FIFO:
 651                 status = nfsd_create(rqstp, &cstate->current_fh,
 652                                      create->cr_name, create->cr_namelen,
 653                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 654                 break;
 655
 656         case NF4DIR:
 657                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 658                 status = nfsd_create(rqstp, &cstate->current_fh,
 659                                      create->cr_name, create->cr_namelen,
 660                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 661                 break;
 662
 663         default:
 664                 status = nfserr_badtype;
 665         }
 666
 667         if (status)
 668                 goto out;
 669
 670         if (create->cr_label.len)
 671                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 672
 673         if (create->cr_acl != NULL)
 674                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 675                                 create->cr_bmval);
 676
 677         fh_unlock(&cstate->current_fh);
 678         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 679         fh_dup2(&cstate->current_fh, &resfh);
 680 out:
 681         fh_put(&resfh);
 682 out_umask:
 683         current->fs->umask = 0;
 684         return status;
 685 }
 686
 687 static __be32
 688 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 689               union nfsd4_op_u *u)
 690 {
 691         struct nfsd4_getattr *getattr = &u->getattr;
 692         __be32 status;
 693
 694         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 695         if (status)
 696                 return status;
 697
 698         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 699                 return nfserr_inval;
 700
 701         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 702         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 703         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 704
 705         getattr->ga_fhp = &cstate->current_fh;
 706         return nfs_ok;
 707 }
 708
 709 static __be32
 710 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 711            union nfsd4_op_u *u)
 712 {
 713         struct nfsd4_link *link = &u->link;
 714         __be32 status;
 715
 716         status = nfsd_link(rqstp, &cstate->current_fh,
 717                            link->li_name, link->li_namelen, &cstate->save_fh);
 718         if (!status)
 719                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 720         return status;
 721 }
 722
 723 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 724 {
 725         struct svc_fh tmp_fh;
 726         __be32 ret;
 727
 728         fh_init(&tmp_fh, NFS4_FHSIZE);
 729         ret = exp_pseudoroot(rqstp, &tmp_fh);
 730         if (ret)
 731                 return ret;
 732         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 733                 fh_put(&tmp_fh);
 734                 return nfserr_noent;
 735         }
 736         fh_put(&tmp_fh);
 737         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 738 }
 739
 740 static __be32
 741 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 742               union nfsd4_op_u *u)
 743 {
 744         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 745 }
 746
 747 static __be32
 748 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 749              union nfsd4_op_u *u)
 750 {
 751         return nfsd_lookup(rqstp, &cstate->current_fh,
 752                            u->lookup.lo_name, u->lookup.lo_len,
 753                            &cstate->current_fh);
 754 }
 755
 756 static __be32
 757 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 758            union nfsd4_op_u *u)
 759 {
 760         struct nfsd4_read *read = &u->read;
 761         __be32 status;
 762
 763         read->rd_filp = NULL;
 764         if (read->rd_offset >= OFFSET_MAX)
 765                 return nfserr_inval;
 766
 767         trace_nfsd_read_start(rqstp, &cstate->current_fh,
 768                               read->rd_offset, read->rd_length);
 769
 770         /*
 771          * If we do a zero copy read, then a client will see read data
 772          * that reflects the state of the file *after* performing the
 773          * following compound.
 774          *
 775          * To ensure proper ordering, we therefore turn off zero copy if
 776          * the client wants us to do more in this compound:
 777          */
 778         if (!nfsd4_last_compound_op(rqstp))
 779                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 780
 781         /* check stateid */
 782         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 783                                         &read->rd_stateid, RD_STATE,
 784                                         &read->rd_filp, &read->rd_tmp_file);
 785         if (status) {
 786                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 787                 goto out;
 788         }
 789         status = nfs_ok;
 790 out:
 791         read->rd_rqstp = rqstp;
 792         read->rd_fhp = &cstate->current_fh;
 793         return status;
 794 }
 795
 796
 797 static void
 798 nfsd4_read_release(union nfsd4_op_u *u)
 799 {
 800         if (u->read.rd_filp)
 801                 fput(u->read.rd_filp);
 802         trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
 803                              u->read.rd_offset, u->read.rd_length);
 804 }
 805
 806 static __be32
 807 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 808               union nfsd4_op_u *u)
 809 {
 810         struct nfsd4_readdir *readdir = &u->readdir;
 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_suppattrs[cstate->minorversion][0];
 820         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 821         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 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                union nfsd4_op_u *u)
 835 {
 836         u->readlink.rl_rqstp = rqstp;
 837         u->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              union nfsd4_op_u *u)
 844 {
 845         struct nfsd4_remove *remove = &u->remove;
 846         __be32 status;
 847
 848         if (opens_in_grace(SVC_NET(rqstp)))
 849                 return nfserr_grace;
 850         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 851                              remove->rm_name, remove->rm_namelen);
 852         if (!status) {
 853                 fh_unlock(&cstate->current_fh);
 854                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 855         }
 856         return status;
 857 }
 858
 859 static __be32
 860 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 861              union nfsd4_op_u *u)
 862 {
 863         struct nfsd4_rename *rename = &u->rename;
 864         __be32 status;
 865
 866         if (opens_in_grace(SVC_NET(rqstp)))
 867                 return nfserr_grace;
 868         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 869                              rename->rn_snamelen, &cstate->current_fh,
 870                              rename->rn_tname, rename->rn_tnamelen);
 871         if (status)
 872                 return status;
 873         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 874         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 875         return nfs_ok;
 876 }
 877
 878 static __be32
 879 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 880               union nfsd4_op_u *u)
 881 {
 882         struct nfsd4_secinfo *secinfo = &u->secinfo;
 883         struct svc_export *exp;
 884         struct dentry *dentry;
 885         __be32 err;
 886
 887         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 888         if (err)
 889                 return err;
 890         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 891                                     secinfo->si_name, secinfo->si_namelen,
 892                                     &exp, &dentry);
 893         if (err)
 894                 return err;
 895         fh_unlock(&cstate->current_fh);
 896         if (d_really_is_negative(dentry)) {
 897                 exp_put(exp);
 898                 err = nfserr_noent;
 899         } else
 900                 secinfo->si_exp = exp;
 901         dput(dentry);
 902         if (cstate->minorversion)
 903                 /* See rfc 5661 section 2.6.3.1.1.8 */
 904                 fh_put(&cstate->current_fh);
 905         return err;
 906 }
 907
 908 static __be32
 909 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 910                 union nfsd4_op_u *u)
 911 {
 912         __be32 err;
 913
 914         switch (u->secinfo_no_name.sin_style) {
 915         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 916                 break;
 917         case NFS4_SECINFO_STYLE4_PARENT:
 918                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 919                 if (err)
 920                         return err;
 921                 break;
 922         default:
 923                 return nfserr_inval;
 924         }
 925
 926         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 927         fh_put(&cstate->current_fh);
 928         return nfs_ok;
 929 }
 930
 931 static void
 932 nfsd4_secinfo_release(union nfsd4_op_u *u)
 933 {
 934         if (u->secinfo.si_exp)
 935                 exp_put(u->secinfo.si_exp);
 936 }
 937
 938 static void
 939 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
 940 {
 941         if (u->secinfo_no_name.sin_exp)
 942                 exp_put(u->secinfo_no_name.sin_exp);
 943 }
 944
 945 static __be32
 946 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 947               union nfsd4_op_u *u)
 948 {
 949         struct nfsd4_setattr *setattr = &u->setattr;
 950         __be32 status = nfs_ok;
 951         int err;
 952
 953         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 954                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 955                                 &cstate->current_fh, &setattr->sa_stateid,
 956                                 WR_STATE, NULL, NULL);
 957                 if (status) {
 958                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 959                         return status;
 960                 }
 961         }
 962         err = fh_want_write(&cstate->current_fh);
 963         if (err)
 964                 return nfserrno(err);
 965         status = nfs_ok;
 966
 967         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 968                                     nfsd_attrmask);
 969         if (status)
 970                 goto out;
 971
 972         if (setattr->sa_acl != NULL)
 973                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 974                                             setattr->sa_acl);
 975         if (status)
 976                 goto out;
 977         if (setattr->sa_label.len)
 978                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 979                                 &setattr->sa_label);
 980         if (status)
 981                 goto out;
 982         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 983                                 0, (time_t)0);
 984 out:
 985         fh_drop_write(&cstate->current_fh);
 986         return status;
 987 }
 988
 989 static __be32
 990 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 991             union nfsd4_op_u *u)
 992 {
 993         struct nfsd4_write *write = &u->write;
 994         stateid_t *stateid = &write->wr_stateid;
 995         struct file *filp = NULL;
 996         __be32 status = nfs_ok;
 997         unsigned long cnt;
 998         int nvecs;
 999
1000         if (write->wr_offset >= OFFSET_MAX)
1001                 return nfserr_inval;
1002
1003         cnt = write->wr_buflen;
1004         trace_nfsd_write_start(rqstp, &cstate->current_fh,
1005                                write->wr_offset, cnt);
1006         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1007                                                 stateid, WR_STATE, &filp, NULL);
1008         if (status) {
1009                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1010                 return status;
1011         }
1012
1013         write->wr_how_written = write->wr_stable_how;
1014         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1015
1016         nvecs = svc_fill_write_vector(rqstp, write->wr_pagelist,
1017                                       &write->wr_head, write->wr_buflen);
1018         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1019
1020         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1021                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1022                                 write->wr_how_written);
1023         fput(filp);
1024
1025         write->wr_bytes_written = cnt;
1026         trace_nfsd_write_done(rqstp, &cstate->current_fh,
1027                               write->wr_offset, cnt);
1028         return status;
1029 }
1030
1031 static __be32
1032 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1033                   stateid_t *src_stateid, struct file **src,
1034                   stateid_t *dst_stateid, struct file **dst)
1035 {
1036         __be32 status;
1037
1038         if (!cstate->save_fh.fh_dentry)
1039                 return nfserr_nofilehandle;
1040
1041         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1042                                             src_stateid, RD_STATE, src, NULL);
1043         if (status) {
1044                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1045                 goto out;
1046         }
1047
1048         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1049                                             dst_stateid, WR_STATE, dst, NULL);
1050         if (status) {
1051                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1052                 goto out_put_src;
1053         }
1054
1055         /* fix up for NFS-specific error code */
1056         if (!S_ISREG(file_inode(*src)->i_mode) ||
1057             !S_ISREG(file_inode(*dst)->i_mode)) {
1058                 status = nfserr_wrong_type;
1059                 goto out_put_dst;
1060         }
1061
1062 out:
1063         return status;
1064 out_put_dst:
1065         fput(*dst);
1066 out_put_src:
1067         fput(*src);
1068         goto out;
1069 }
1070
1071 static __be32
1072 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1073                 union nfsd4_op_u *u)
1074 {
1075         struct nfsd4_clone *clone = &u->clone;
1076         struct file *src, *dst;
1077         __be32 status;
1078
1079         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1080                                    &clone->cl_dst_stateid, &dst);
1081         if (status)
1082                 goto out;
1083
1084         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1085                         dst, clone->cl_dst_pos, clone->cl_count);
1086
1087         fput(dst);
1088         fput(src);
1089 out:
1090         return status;
1091 }
1092
1093 void nfs4_put_copy(struct nfsd4_copy *copy)
1094 {
1095         if (!refcount_dec_and_test(&copy->refcount))
1096                 return;
1097         kfree(copy);
1098 }
1099
1100 static bool
1101 check_and_set_stop_copy(struct nfsd4_copy *copy)
1102 {
1103         bool value;
1104
1105         spin_lock(&copy->cp_clp->async_lock);
1106         value = copy->stopped;
1107         if (!copy->stopped)
1108                 copy->stopped = true;
1109         spin_unlock(&copy->cp_clp->async_lock);
1110         return value;
1111 }
1112
1113 static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1114 {
1115         /* only 1 thread should stop the copy */
1116         if (!check_and_set_stop_copy(copy))
1117                 kthread_stop(copy->copy_task);
1118         nfs4_put_copy(copy);
1119 }
1120
1121 static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
1122 {
1123         struct nfsd4_copy *copy = NULL;
1124
1125         spin_lock(&clp->async_lock);
1126         if (!list_empty(&clp->async_copies)) {
1127                 copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1128                                         copies);
1129                 refcount_inc(&copy->refcount);
1130         }
1131         spin_unlock(&clp->async_lock);
1132         return copy;
1133 }
1134
1135 void nfsd4_shutdown_copy(struct nfs4_client *clp)
1136 {
1137         struct nfsd4_copy *copy;
1138
1139         while ((copy = nfsd4_get_copy(clp)) != NULL)
1140                 nfsd4_stop_copy(copy);
1141 }
1142
1143 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1144 {
1145         struct nfsd4_copy *copy = container_of(cb, struct nfsd4_copy, cp_cb);
1146
1147         nfs4_put_copy(copy);
1148 }
1149
1150 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1151                                  struct rpc_task *task)
1152 {
1153         return 1;
1154 }
1155
1156 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1157         .release = nfsd4_cb_offload_release,
1158         .done = nfsd4_cb_offload_done
1159 };
1160
1161 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1162 {
1163         copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1164         copy->cp_synchronous = sync;
1165         gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
1166 }
1167
1168 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy)
1169 {
1170         ssize_t bytes_copied = 0;
1171         size_t bytes_total = copy->cp_count;
1172         u64 src_pos = copy->cp_src_pos;
1173         u64 dst_pos = copy->cp_dst_pos;
1174
1175         do {
1176                 if (kthread_should_stop())
1177                         break;
1178                 bytes_copied = nfsd_copy_file_range(copy->file_src, src_pos,
1179                                 copy->file_dst, dst_pos, bytes_total);
1180                 if (bytes_copied <= 0)
1181                         break;
1182                 bytes_total -= bytes_copied;
1183                 copy->cp_res.wr_bytes_written += bytes_copied;
1184                 src_pos += bytes_copied;
1185                 dst_pos += bytes_copied;
1186         } while (bytes_total > 0 && !copy->cp_synchronous);
1187         return bytes_copied;
1188 }
1189
1190 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy, bool sync)
1191 {
1192         __be32 status;
1193         ssize_t bytes;
1194
1195         bytes = _nfsd_copy_file_range(copy);
1196         /* for async copy, we ignore the error, client can always retry
1197          * to get the error
1198          */
1199         if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1200                 status = nfserrno(bytes);
1201         else {
1202                 nfsd4_init_copy_res(copy, sync);
1203                 status = nfs_ok;
1204         }
1205
1206         fput(copy->file_src);
1207         fput(copy->file_dst);
1208         return status;
1209 }
1210
1211 static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1212 {
1213         dst->cp_src_pos = src->cp_src_pos;
1214         dst->cp_dst_pos = src->cp_dst_pos;
1215         dst->cp_count = src->cp_count;
1216         dst->cp_synchronous = src->cp_synchronous;
1217         memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1218         memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1219         dst->cp_clp = src->cp_clp;
1220         dst->file_dst = get_file(src->file_dst);
1221         dst->file_src = get_file(src->file_src);
1222         memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1223 }
1224
1225 static void cleanup_async_copy(struct nfsd4_copy *copy)
1226 {
1227         nfs4_free_cp_state(copy);
1228         fput(copy->file_dst);
1229         fput(copy->file_src);
1230         spin_lock(&copy->cp_clp->async_lock);
1231         list_del(&copy->copies);
1232         spin_unlock(&copy->cp_clp->async_lock);
1233         nfs4_put_copy(copy);
1234 }
1235
1236 static int nfsd4_do_async_copy(void *data)
1237 {
1238         struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1239         struct nfsd4_copy *cb_copy;
1240
1241         copy->nfserr = nfsd4_do_copy(copy, 0);
1242         cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1243         if (!cb_copy)
1244                 goto out;
1245         memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
1246         cb_copy->cp_clp = copy->cp_clp;
1247         cb_copy->nfserr = copy->nfserr;
1248         memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
1249         nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
1250                         &nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
1251         nfsd4_run_cb(&cb_copy->cp_cb);
1252 out:
1253         cleanup_async_copy(copy);
1254         return 0;
1255 }
1256
1257 static __be32
1258 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1259                 union nfsd4_op_u *u)
1260 {
1261         struct nfsd4_copy *copy = &u->copy;
1262         __be32 status;
1263         struct nfsd4_copy *async_copy = NULL;
1264
1265         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
1266                                    &copy->file_src, &copy->cp_dst_stateid,
1267                                    &copy->file_dst);
1268         if (status)
1269                 goto out;
1270
1271         copy->cp_clp = cstate->clp;
1272         memcpy(&copy->fh, &cstate->current_fh.fh_handle,
1273                 sizeof(struct knfsd_fh));
1274         if (!copy->cp_synchronous) {
1275                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1276
1277                 status = nfserrno(-ENOMEM);
1278                 async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1279                 if (!async_copy)
1280                         goto out;
1281                 if (!nfs4_init_cp_state(nn, copy)) {
1282                         kfree(async_copy);
1283                         goto out;
1284                 }
1285                 refcount_set(&async_copy->refcount, 1);
1286                 memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid,
1287                         sizeof(copy->cp_stateid));
1288                 dup_copy_fields(copy, async_copy);
1289                 async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1290                                 async_copy, "%s", "copy thread");
1291                 if (IS_ERR(async_copy->copy_task))
1292                         goto out_err;
1293                 spin_lock(&async_copy->cp_clp->async_lock);
1294                 list_add(&async_copy->copies,
1295                                 &async_copy->cp_clp->async_copies);
1296                 spin_unlock(&async_copy->cp_clp->async_lock);
1297                 wake_up_process(async_copy->copy_task);
1298                 status = nfs_ok;
1299         } else
1300                 status = nfsd4_do_copy(copy, 1);
1301 out:
1302         return status;
1303 out_err:
1304         cleanup_async_copy(async_copy);
1305         goto out;
1306 }
1307
1308 struct nfsd4_copy *
1309 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1310 {
1311         struct nfsd4_copy *copy;
1312
1313         spin_lock(&clp->async_lock);
1314         list_for_each_entry(copy, &clp->async_copies, copies) {
1315                 if (memcmp(&copy->cp_stateid, stateid, NFS4_STATEID_SIZE))
1316                         continue;
1317                 refcount_inc(&copy->refcount);
1318                 spin_unlock(&clp->async_lock);
1319                 return copy;
1320         }
1321         spin_unlock(&clp->async_lock);
1322         return NULL;
1323 }
1324
1325 static __be32
1326 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1327                      struct nfsd4_compound_state *cstate,
1328                      union nfsd4_op_u *u)
1329 {
1330         struct nfsd4_offload_status *os = &u->offload_status;
1331         __be32 status = 0;
1332         struct nfsd4_copy *copy;
1333         struct nfs4_client *clp = cstate->clp;
1334
1335         copy = find_async_copy(clp, &os->stateid);
1336         if (copy)
1337                 nfsd4_stop_copy(copy);
1338         else
1339                 status = nfserr_bad_stateid;
1340
1341         return status;
1342 }
1343
1344 static __be32
1345 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1346                 struct nfsd4_fallocate *fallocate, int flags)
1347 {
1348         __be32 status;
1349         struct file *file;
1350
1351         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1352                                             &fallocate->falloc_stateid,
1353                                             WR_STATE, &file, NULL);
1354         if (status != nfs_ok) {
1355                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1356                 return status;
1357         }
1358
1359         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1360                                      fallocate->falloc_offset,
1361                                      fallocate->falloc_length,
1362                                      flags);
1363         fput(file);
1364         return status;
1365 }
1366 static __be32
1367 nfsd4_offload_status(struct svc_rqst *rqstp,
1368                      struct nfsd4_compound_state *cstate,
1369                      union nfsd4_op_u *u)
1370 {
1371         struct nfsd4_offload_status *os = &u->offload_status;
1372         __be32 status = 0;
1373         struct nfsd4_copy *copy;
1374         struct nfs4_client *clp = cstate->clp;
1375
1376         copy = find_async_copy(clp, &os->stateid);
1377         if (copy) {
1378                 os->count = copy->cp_res.wr_bytes_written;
1379                 nfs4_put_copy(copy);
1380         } else
1381                 status = nfserr_bad_stateid;
1382
1383         return status;
1384 }
1385
1386 static __be32
1387 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1388                union nfsd4_op_u *u)
1389 {
1390         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1391 }
1392
1393 static __be32
1394 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1395                  union nfsd4_op_u *u)
1396 {
1397         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1398                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1399 }
1400
1401 static __be32
1402 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1403            union nfsd4_op_u *u)
1404 {
1405         struct nfsd4_seek *seek = &u->seek;
1406         int whence;
1407         __be32 status;
1408         struct file *file;
1409
1410         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1411                                             &seek->seek_stateid,
1412                                             RD_STATE, &file, NULL);
1413         if (status) {
1414                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1415                 return status;
1416         }
1417
1418         switch (seek->seek_whence) {
1419         case NFS4_CONTENT_DATA:
1420                 whence = SEEK_DATA;
1421                 break;
1422         case NFS4_CONTENT_HOLE:
1423                 whence = SEEK_HOLE;
1424                 break;
1425         default:
1426                 status = nfserr_union_notsupp;
1427                 goto out;
1428         }
1429
1430         /*
1431          * Note:  This call does change file->f_pos, but nothing in NFSD
1432          *        should ever file->f_pos.
1433          */
1434         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1435         if (seek->seek_pos < 0)
1436                 status = nfserrno(seek->seek_pos);
1437         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1438                 seek->seek_eof = true;
1439
1440 out:
1441         fput(file);
1442         return status;
1443 }
1444
1445 /* This routine never returns NFS_OK!  If there are no other errors, it
1446  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1447  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1448  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1449  */
1450 static __be32
1451 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1452              struct nfsd4_verify *verify)
1453 {
1454         __be32 *buf, *p;
1455         int count;
1456         __be32 status;
1457
1458         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1459         if (status)
1460                 return status;
1461
1462         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1463         if (status)
1464                 return status;
1465
1466         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1467             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1468                 return nfserr_inval;
1469         if (verify->ve_attrlen & 3)
1470                 return nfserr_inval;
1471
1472         /* count in words:
1473          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1474          */
1475         count = 4 + (verify->ve_attrlen >> 2);
1476         buf = kmalloc(count << 2, GFP_KERNEL);
1477         if (!buf)
1478                 return nfserr_jukebox;
1479
1480         p = buf;
1481         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1482                                     cstate->current_fh.fh_export,
1483                                     cstate->current_fh.fh_dentry,
1484                                     verify->ve_bmval,
1485                                     rqstp, 0);
1486         /*
1487          * If nfsd4_encode_fattr() ran out of space, assume that's because
1488          * the attributes are longer (hence different) than those given:
1489          */
1490         if (status == nfserr_resource)
1491                 status = nfserr_not_same;
1492         if (status)
1493                 goto out_kfree;
1494
1495         /* skip bitmap */
1496         p = buf + 1 + ntohl(buf[0]);
1497         status = nfserr_not_same;
1498         if (ntohl(*p++) != verify->ve_attrlen)
1499                 goto out_kfree;
1500         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1501                 status = nfserr_same;
1502
1503 out_kfree:
1504         kfree(buf);
1505         return status;
1506 }
1507
1508 static __be32
1509 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1510               union nfsd4_op_u *u)
1511 {
1512         __be32 status;
1513
1514         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1515         return status == nfserr_not_same ? nfs_ok : status;
1516 }
1517
1518 static __be32
1519 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1520              union nfsd4_op_u *u)
1521 {
1522         __be32 status;
1523
1524         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1525         return status == nfserr_same ? nfs_ok : status;
1526 }
1527
1528 #ifdef CONFIG_NFSD_PNFS
1529 static const struct nfsd4_layout_ops *
1530 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1531 {
1532         if (!exp->ex_layout_types) {
1533                 dprintk("%s: export does not support pNFS\n", __func__);
1534                 return NULL;
1535         }
1536
1537         if (layout_type >= LAYOUT_TYPE_MAX ||
1538             !(exp->ex_layout_types & (1 << layout_type))) {
1539                 dprintk("%s: layout type %d not supported\n",
1540                         __func__, layout_type);
1541                 return NULL;
1542         }
1543
1544         return nfsd4_layout_ops[layout_type];
1545 }
1546
1547 static __be32
1548 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1549                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1550 {
1551         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1552         const struct nfsd4_layout_ops *ops;
1553         struct nfsd4_deviceid_map *map;
1554         struct svc_export *exp;
1555         __be32 nfserr;
1556
1557         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1558                __func__,
1559                gdp->gd_layout_type,
1560                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1561                gdp->gd_maxcount);
1562
1563         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1564         if (!map) {
1565                 dprintk("%s: couldn't find device ID to export mapping!\n",
1566                         __func__);
1567                 return nfserr_noent;
1568         }
1569
1570         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1571         if (IS_ERR(exp)) {
1572                 dprintk("%s: could not find device id\n", __func__);
1573                 return nfserr_noent;
1574         }
1575
1576         nfserr = nfserr_layoutunavailable;
1577         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1578         if (!ops)
1579                 goto out;
1580
1581         nfserr = nfs_ok;
1582         if (gdp->gd_maxcount != 0) {
1583                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1584                                 rqstp, cstate->session->se_client, gdp);
1585         }
1586
1587         gdp->gd_notify_types &= ops->notify_types;
1588 out:
1589         exp_put(exp);
1590         return nfserr;
1591 }
1592
1593 static void
1594 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1595 {
1596         kfree(u->getdeviceinfo.gd_device);
1597 }
1598
1599 static __be32
1600 nfsd4_layoutget(struct svc_rqst *rqstp,
1601                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1602 {
1603         struct nfsd4_layoutget *lgp = &u->layoutget;
1604         struct svc_fh *current_fh = &cstate->current_fh;
1605         const struct nfsd4_layout_ops *ops;
1606         struct nfs4_layout_stateid *ls;
1607         __be32 nfserr;
1608         int accmode = NFSD_MAY_READ_IF_EXEC;
1609
1610         switch (lgp->lg_seg.iomode) {
1611         case IOMODE_READ:
1612                 accmode |= NFSD_MAY_READ;
1613                 break;
1614         case IOMODE_RW:
1615                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
1616                 break;
1617         default:
1618                 dprintk("%s: invalid iomode %d\n",
1619                         __func__, lgp->lg_seg.iomode);
1620                 nfserr = nfserr_badiomode;
1621                 goto out;
1622         }
1623
1624         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1625         if (nfserr)
1626                 goto out;
1627
1628         nfserr = nfserr_layoutunavailable;
1629         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1630         if (!ops)
1631                 goto out;
1632
1633         /*
1634          * Verify minlength and range as per RFC5661:
1635          *  o  If loga_length is less than loga_minlength,
1636          *     the metadata server MUST return NFS4ERR_INVAL.
1637          *  o  If the sum of loga_offset and loga_minlength exceeds
1638          *     NFS4_UINT64_MAX, and loga_minlength is not
1639          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1640          *  o  If the sum of loga_offset and loga_length exceeds
1641          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1642          *     the error NFS4ERR_INVAL MUST result.
1643          */
1644         nfserr = nfserr_inval;
1645         if (lgp->lg_seg.length < lgp->lg_minlength ||
1646             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1647              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1648             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1649              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1650                 goto out;
1651         if (lgp->lg_seg.length == 0)
1652                 goto out;
1653
1654         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1655                                                 true, lgp->lg_layout_type, &ls);
1656         if (nfserr) {
1657                 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
1658                 goto out;
1659         }
1660
1661         nfserr = nfserr_recallconflict;
1662         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1663                 goto out_put_stid;
1664
1665         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1666                                      current_fh, lgp);
1667         if (nfserr)
1668                 goto out_put_stid;
1669
1670         nfserr = nfsd4_insert_layout(lgp, ls);
1671
1672 out_put_stid:
1673         mutex_unlock(&ls->ls_mutex);
1674         nfs4_put_stid(&ls->ls_stid);
1675 out:
1676         return nfserr;
1677 }
1678
1679 static void
1680 nfsd4_layoutget_release(union nfsd4_op_u *u)
1681 {
1682         kfree(u->layoutget.lg_content);
1683 }
1684
1685 static __be32
1686 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1687                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1688 {
1689         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1690         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1691         struct svc_fh *current_fh = &cstate->current_fh;
1692         const struct nfsd4_layout_ops *ops;
1693         loff_t new_size = lcp->lc_last_wr + 1;
1694         struct inode *inode;
1695         struct nfs4_layout_stateid *ls;
1696         __be32 nfserr;
1697
1698         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1699         if (nfserr)
1700                 goto out;
1701
1702         nfserr = nfserr_layoutunavailable;
1703         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1704         if (!ops)
1705                 goto out;
1706         inode = d_inode(current_fh->fh_dentry);
1707
1708         nfserr = nfserr_inval;
1709         if (new_size <= seg->offset) {
1710                 dprintk("pnfsd: last write before layout segment\n");
1711                 goto out;
1712         }
1713         if (new_size > seg->offset + seg->length) {
1714                 dprintk("pnfsd: last write beyond layout segment\n");
1715                 goto out;
1716         }
1717         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1718                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1719                 goto out;
1720         }
1721
1722         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1723                                                 false, lcp->lc_layout_type,
1724                                                 &ls);
1725         if (nfserr) {
1726                 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
1727                 /* fixup error code as per RFC5661 */
1728                 if (nfserr == nfserr_bad_stateid)
1729                         nfserr = nfserr_badlayout;
1730                 goto out;
1731         }
1732
1733         /* LAYOUTCOMMIT does not require any serialization */
1734         mutex_unlock(&ls->ls_mutex);
1735
1736         if (new_size > i_size_read(inode)) {
1737                 lcp->lc_size_chg = 1;
1738                 lcp->lc_newsize = new_size;
1739         } else {
1740                 lcp->lc_size_chg = 0;
1741         }
1742
1743         nfserr = ops->proc_layoutcommit(inode, lcp);
1744         nfs4_put_stid(&ls->ls_stid);
1745 out:
1746         return nfserr;
1747 }
1748
1749 static __be32
1750 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1751                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1752 {
1753         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1754         struct svc_fh *current_fh = &cstate->current_fh;
1755         __be32 nfserr;
1756
1757         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1758         if (nfserr)
1759                 goto out;
1760
1761         nfserr = nfserr_layoutunavailable;
1762         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1763                 goto out;
1764
1765         switch (lrp->lr_seg.iomode) {
1766         case IOMODE_READ:
1767         case IOMODE_RW:
1768         case IOMODE_ANY:
1769                 break;
1770         default:
1771                 dprintk("%s: invalid iomode %d\n", __func__,
1772                         lrp->lr_seg.iomode);
1773                 nfserr = nfserr_inval;
1774                 goto out;
1775         }
1776
1777         switch (lrp->lr_return_type) {
1778         case RETURN_FILE:
1779                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1780                 break;
1781         case RETURN_FSID:
1782         case RETURN_ALL:
1783                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1784                 break;
1785         default:
1786                 dprintk("%s: invalid return_type %d\n", __func__,
1787                         lrp->lr_return_type);
1788                 nfserr = nfserr_inval;
1789                 break;
1790         }
1791 out:
1792         return nfserr;
1793 }
1794 #endif /* CONFIG_NFSD_PNFS */
1795
1796 /*
1797  * NULL call.
1798  */
1799 static __be32
1800 nfsd4_proc_null(struct svc_rqst *rqstp)
1801 {
1802         return nfs_ok;
1803 }
1804
1805 static inline void nfsd4_increment_op_stats(u32 opnum)
1806 {
1807         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1808                 nfsdstats.nfs4_opcount[opnum]++;
1809 }
1810
1811 static const struct nfsd4_operation nfsd4_ops[];
1812
1813 static const char *nfsd4_op_name(unsigned opnum);
1814
1815 /*
1816  * Enforce NFSv4.1 COMPOUND ordering rules:
1817  *
1818  * Also note, enforced elsewhere:
1819  *      - SEQUENCE other than as first op results in
1820  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1821  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1822  *        (Enforced in nfsd4_bind_conn_to_session().)
1823  *      - DESTROY_SESSION must be the final operation in a compound, if
1824  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1825  *        (Enforced in nfsd4_destroy_session().)
1826  */
1827 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1828 {
1829         struct nfsd4_op *first_op = &args->ops[0];
1830
1831         /* These ordering requirements don't apply to NFSv4.0: */
1832         if (args->minorversion == 0)
1833                 return nfs_ok;
1834         /* This is weird, but OK, not our problem: */
1835         if (args->opcnt == 0)
1836                 return nfs_ok;
1837         if (first_op->status == nfserr_op_illegal)
1838                 return nfs_ok;
1839         if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1840                 return nfserr_op_not_in_session;
1841         if (first_op->opnum == OP_SEQUENCE)
1842                 return nfs_ok;
1843         /*
1844          * So first_op is something allowed outside a session, like
1845          * EXCHANGE_ID; but then it has to be the only op in the
1846          * compound:
1847          */
1848         if (args->opcnt != 1)
1849                 return nfserr_not_only_op;
1850         return nfs_ok;
1851 }
1852
1853 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1854 {
1855         return &nfsd4_ops[op->opnum];
1856 }
1857
1858 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1859 {
1860         if (op->opnum == OP_ILLEGAL)
1861                 return false;
1862         return OPDESC(op)->op_flags & OP_CACHEME;
1863 }
1864
1865 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1866 {
1867         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1868         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1869         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1870         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1871         const struct nfsd4_operation *thisd = OPDESC(this);
1872         const struct nfsd4_operation *nextd;
1873
1874         /*
1875          * Most ops check wronsec on our own; only the putfh-like ops
1876          * have special rules.
1877          */
1878         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1879                 return false;
1880         /*
1881          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1882          * put-filehandle operation if we're not going to use the
1883          * result:
1884          */
1885         if (argp->opcnt == resp->opcnt)
1886                 return false;
1887         if (next->opnum == OP_ILLEGAL)
1888                 return false;
1889         nextd = OPDESC(next);
1890         /*
1891          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1892          * errors themselves as necessary; others should check for them
1893          * now:
1894          */
1895         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1896 }
1897
1898 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1899                                struct nfsd4_compoundres *resp)
1900 {
1901         struct xdr_stream *xdr = &resp->xdr;
1902         struct xdr_buf *buf = &rqstp->rq_res;
1903         struct kvec *head = buf->head;
1904
1905         xdr->buf = buf;
1906         xdr->iov = head;
1907         xdr->p   = head->iov_base + head->iov_len;
1908         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1909         /* Tail and page_len should be zero at this point: */
1910         buf->len = buf->head[0].iov_len;
1911         xdr->scratch.iov_len = 0;
1912         xdr->page_ptr = buf->pages - 1;
1913         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1914                 - rqstp->rq_auth_slack;
1915 }
1916
1917 /*
1918  * COMPOUND call.
1919  */
1920 static __be32
1921 nfsd4_proc_compound(struct svc_rqst *rqstp)
1922 {
1923         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1924         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1925         struct nfsd4_op *op;
1926         struct nfsd4_compound_state *cstate = &resp->cstate;
1927         struct svc_fh *current_fh = &cstate->current_fh;
1928         struct svc_fh *save_fh = &cstate->save_fh;
1929         __be32          status;
1930
1931         svcxdr_init_encode(rqstp, resp);
1932         resp->tagp = resp->xdr.p;
1933         /* reserve space for: taglen, tag, and opcnt */
1934         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1935         resp->taglen = args->taglen;
1936         resp->tag = args->tag;
1937         resp->rqstp = rqstp;
1938         cstate->minorversion = args->minorversion;
1939         fh_init(current_fh, NFS4_FHSIZE);
1940         fh_init(save_fh, NFS4_FHSIZE);
1941         /*
1942          * Don't use the deferral mechanism for NFSv4; compounds make it
1943          * too hard to avoid non-idempotency problems.
1944          */
1945         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1946
1947         /*
1948          * According to RFC3010, this takes precedence over all other errors.
1949          */
1950         status = nfserr_minor_vers_mismatch;
1951         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1952                 goto out;
1953         status = nfserr_resource;
1954         if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1955                 goto out;
1956
1957         status = nfs41_check_op_ordering(args);
1958         if (status) {
1959                 op = &args->ops[0];
1960                 op->status = status;
1961                 resp->opcnt = 1;
1962                 goto encode_op;
1963         }
1964
1965         trace_nfsd_compound(rqstp, args->opcnt);
1966         while (!status && resp->opcnt < args->opcnt) {
1967                 op = &args->ops[resp->opcnt++];
1968
1969                 /*
1970                  * The XDR decode routines may have pre-set op->status;
1971                  * for example, if there is a miscellaneous XDR error
1972                  * it will be set to nfserr_bad_xdr.
1973                  */
1974                 if (op->status) {
1975                         if (op->opnum == OP_OPEN)
1976                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1977                         goto encode_op;
1978                 }
1979
1980                 if (!current_fh->fh_dentry) {
1981                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1982                                 op->status = nfserr_nofilehandle;
1983                                 goto encode_op;
1984                         }
1985                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1986                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1987                         op->status = nfserr_moved;
1988                         goto encode_op;
1989                 }
1990
1991                 fh_clear_wcc(current_fh);
1992
1993                 /* If op is non-idempotent */
1994                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1995                         /*
1996                          * Don't execute this op if we couldn't encode a
1997                          * succesful reply:
1998                          */
1999                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2000                         /*
2001                          * Plus if there's another operation, make sure
2002                          * we'll have space to at least encode an error:
2003                          */
2004                         if (resp->opcnt < args->opcnt)
2005                                 plen += COMPOUND_ERR_SLACK_SPACE;
2006                         op->status = nfsd4_check_resp_size(resp, plen);
2007                 }
2008
2009                 if (op->status)
2010                         goto encode_op;
2011
2012                 if (op->opdesc->op_get_currentstateid)
2013                         op->opdesc->op_get_currentstateid(cstate, &op->u);
2014                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2015
2016                 /* Only from SEQUENCE */
2017                 if (cstate->status == nfserr_replay_cache) {
2018                         dprintk("%s NFS4.1 replay from cache\n", __func__);
2019                         status = op->status;
2020                         goto out;
2021                 }
2022                 if (!op->status) {
2023                         if (op->opdesc->op_set_currentstateid)
2024                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
2025
2026                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2027                                 clear_current_stateid(cstate);
2028
2029                         if (need_wrongsec_check(rqstp))
2030                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2031                 }
2032 encode_op:
2033                 if (op->status == nfserr_replay_me) {
2034                         op->replay = &cstate->replay_owner->so_replay;
2035                         nfsd4_encode_replay(&resp->xdr, op);
2036                         status = op->status = op->replay->rp_status;
2037                 } else {
2038                         nfsd4_encode_operation(resp, op);
2039                         status = op->status;
2040                 }
2041
2042                 trace_nfsd_compound_status(args->opcnt, resp->opcnt, status,
2043                                            nfsd4_op_name(op->opnum));
2044
2045                 nfsd4_cstate_clear_replay(cstate);
2046                 nfsd4_increment_op_stats(op->opnum);
2047         }
2048
2049         cstate->status = status;
2050         fh_put(current_fh);
2051         fh_put(save_fh);
2052         BUG_ON(cstate->replay_owner);
2053 out:
2054         /* Reset deferral mechanism for RPC deferrals */
2055         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2056         dprintk("nfsv4 compound returned %d\n", ntohl(status));
2057         return status;
2058 }
2059
2060 #define op_encode_hdr_size              (2)
2061 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
2062 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2063 #define op_encode_change_info_maxsz     (5)
2064 #define nfs4_fattr_bitmap_maxsz         (4)
2065
2066 /* We'll fall back on returning no lockowner if run out of space: */
2067 #define op_encode_lockowner_maxsz       (0)
2068 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
2069
2070 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
2071
2072 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
2073 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
2074                                          op_encode_ace_maxsz)
2075
2076 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
2077
2078 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2079 {
2080         return (op_encode_hdr_size) * sizeof(__be32);
2081 }
2082
2083 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2084 {
2085         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2086 }
2087
2088 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2089 {
2090         /* ac_supported, ac_resp_access */
2091         return (op_encode_hdr_size + 2)* sizeof(__be32);
2092 }
2093
2094 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2095 {
2096         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2097 }
2098
2099 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2100 {
2101         return (op_encode_hdr_size + op_encode_change_info_maxsz
2102                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2103 }
2104
2105 /*
2106  * Note since this is an idempotent operation we won't insist on failing
2107  * the op prematurely if the estimate is too large.  We may turn off splice
2108  * reads unnecessarily.
2109  */
2110 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
2111                                       struct nfsd4_op *op)
2112 {
2113         u32 *bmap = op->u.getattr.ga_bmval;
2114         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2115         u32 ret = 0;
2116
2117         if (bmap0 & FATTR4_WORD0_ACL)
2118                 return svc_max_payload(rqstp);
2119         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2120                 return svc_max_payload(rqstp);
2121
2122         if (bmap1 & FATTR4_WORD1_OWNER) {
2123                 ret += IDMAP_NAMESZ + 4;
2124                 bmap1 &= ~FATTR4_WORD1_OWNER;
2125         }
2126         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2127                 ret += IDMAP_NAMESZ + 4;
2128                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2129         }
2130         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2131                 ret += NFS4_FHSIZE + 4;
2132                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2133         }
2134         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2135                 ret += NFS4_MAXLABELLEN + 12;
2136                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2137         }
2138         /*
2139          * Largest of remaining attributes are 16 bytes (e.g.,
2140          * supported_attributes)
2141          */
2142         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2143         /* bitmask, length */
2144         ret += 20;
2145         return ret;
2146 }
2147
2148 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2149 {
2150         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2151 }
2152
2153 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2154 {
2155         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2156                 * sizeof(__be32);
2157 }
2158
2159 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2160 {
2161         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2162                 * sizeof(__be32);
2163 }
2164
2165 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2166 {
2167         return (op_encode_hdr_size + op_encode_stateid_maxsz
2168                 + op_encode_change_info_maxsz + 1
2169                 + nfs4_fattr_bitmap_maxsz
2170                 + op_encode_delegation_maxsz) * sizeof(__be32);
2171 }
2172
2173 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2174 {
2175         u32 maxcount = 0, rlen = 0;
2176
2177         maxcount = svc_max_payload(rqstp);
2178         rlen = min(op->u.read.rd_length, maxcount);
2179
2180         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2181 }
2182
2183 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2184 {
2185         u32 maxcount = 0, rlen = 0;
2186
2187         maxcount = svc_max_payload(rqstp);
2188         rlen = min(op->u.readdir.rd_maxcount, maxcount);
2189
2190         return (op_encode_hdr_size + op_encode_verifier_maxsz +
2191                 XDR_QUADLEN(rlen)) * sizeof(__be32);
2192 }
2193
2194 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2195 {
2196         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2197 }
2198
2199 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2200 {
2201         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2202                 * sizeof(__be32);
2203 }
2204
2205 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2206 {
2207         return (op_encode_hdr_size + op_encode_change_info_maxsz
2208                 + op_encode_change_info_maxsz) * sizeof(__be32);
2209 }
2210
2211 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
2212                                        struct nfsd4_op *op)
2213 {
2214         return (op_encode_hdr_size
2215                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
2216 }
2217
2218 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2219 {
2220         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
2221                 * sizeof(__be32);
2222 }
2223
2224 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2225 {
2226         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2227 }
2228
2229 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2230 {
2231         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2232                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2233 }
2234
2235 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2236 {
2237         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2238                                                                 sizeof(__be32);
2239 }
2240
2241 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2242 {
2243         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2244 }
2245
2246 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2247 {
2248         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2249                 1 + 1 + /* eir_flags, spr_how */\
2250                 4 + /* spo_must_enforce & _allow with bitmap */\
2251                 2 + /*eir_server_owner.so_minor_id */\
2252                 /* eir_server_owner.so_major_id<> */\
2253                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2254                 /* eir_server_scope<> */\
2255                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2256                 1 + /* eir_server_impl_id array length */\
2257                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2258 }
2259
2260 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2261 {
2262         return (op_encode_hdr_size + \
2263                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2264                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2265 }
2266
2267 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2268 {
2269         return (op_encode_hdr_size + \
2270                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2271                 2 + /* csr_sequence, csr_flags */\
2272                 op_encode_channel_attrs_maxsz + \
2273                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2274 }
2275
2276 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2277 {
2278         return (op_encode_hdr_size +
2279                 1 /* wr_callback */ +
2280                 op_encode_stateid_maxsz /* wr_callback */ +
2281                 2 /* wr_count */ +
2282                 1 /* wr_committed */ +
2283                 op_encode_verifier_maxsz +
2284                 1 /* cr_consecutive */ +
2285                 1 /* cr_synchronous */) * sizeof(__be32);
2286 }
2287
2288 static inline u32 nfsd4_offload_status_rsize(struct svc_rqst *rqstp,
2289                                              struct nfsd4_op *op)
2290 {
2291         return (op_encode_hdr_size +
2292                 2 /* osr_count */ +
2293                 1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
2294 }
2295
2296 #ifdef CONFIG_NFSD_PNFS
2297 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2298 {
2299         u32 maxcount = 0, rlen = 0;
2300
2301         maxcount = svc_max_payload(rqstp);
2302         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2303
2304         return (op_encode_hdr_size +
2305                 1 /* gd_layout_type*/ +
2306                 XDR_QUADLEN(rlen) +
2307                 2 /* gd_notify_types */) * sizeof(__be32);
2308 }
2309
2310 /*
2311  * At this stage we don't really know what layout driver will handle the request,
2312  * so we need to define an arbitrary upper bound here.
2313  */
2314 #define MAX_LAYOUT_SIZE         128
2315 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2316 {
2317         return (op_encode_hdr_size +
2318                 1 /* logr_return_on_close */ +
2319                 op_encode_stateid_maxsz +
2320                 1 /* nr of layouts */ +
2321                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2322 }
2323
2324 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2325 {
2326         return (op_encode_hdr_size +
2327                 1 /* locr_newsize */ +
2328                 2 /* ns_size */) * sizeof(__be32);
2329 }
2330
2331 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2332 {
2333         return (op_encode_hdr_size +
2334                 1 /* lrs_stateid */ +
2335                 op_encode_stateid_maxsz) * sizeof(__be32);
2336 }
2337 #endif /* CONFIG_NFSD_PNFS */
2338
2339
2340 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2341 {
2342         return (op_encode_hdr_size + 3) * sizeof(__be32);
2343 }
2344
2345 static const struct nfsd4_operation nfsd4_ops[] = {
2346         [OP_ACCESS] = {
2347                 .op_func = nfsd4_access,
2348                 .op_name = "OP_ACCESS",
2349                 .op_rsize_bop = nfsd4_access_rsize,
2350         },
2351         [OP_CLOSE] = {
2352                 .op_func = nfsd4_close,
2353                 .op_flags = OP_MODIFIES_SOMETHING,
2354                 .op_name = "OP_CLOSE",
2355                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2356                 .op_get_currentstateid = nfsd4_get_closestateid,
2357                 .op_set_currentstateid = nfsd4_set_closestateid,
2358         },
2359         [OP_COMMIT] = {
2360                 .op_func = nfsd4_commit,
2361                 .op_flags = OP_MODIFIES_SOMETHING,
2362                 .op_name = "OP_COMMIT",
2363                 .op_rsize_bop = nfsd4_commit_rsize,
2364         },
2365         [OP_CREATE] = {
2366                 .op_func = nfsd4_create,
2367                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2368                 .op_name = "OP_CREATE",
2369                 .op_rsize_bop = nfsd4_create_rsize,
2370         },
2371         [OP_DELEGRETURN] = {
2372                 .op_func = nfsd4_delegreturn,
2373                 .op_flags = OP_MODIFIES_SOMETHING,
2374                 .op_name = "OP_DELEGRETURN",
2375                 .op_rsize_bop = nfsd4_only_status_rsize,
2376                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2377         },
2378         [OP_GETATTR] = {
2379                 .op_func = nfsd4_getattr,
2380                 .op_flags = ALLOWED_ON_ABSENT_FS,
2381                 .op_rsize_bop = nfsd4_getattr_rsize,
2382                 .op_name = "OP_GETATTR",
2383         },
2384         [OP_GETFH] = {
2385                 .op_func = nfsd4_getfh,
2386                 .op_name = "OP_GETFH",
2387                 .op_rsize_bop = nfsd4_getfh_rsize,
2388         },
2389         [OP_LINK] = {
2390                 .op_func = nfsd4_link,
2391                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2392                                 | OP_CACHEME,
2393                 .op_name = "OP_LINK",
2394                 .op_rsize_bop = nfsd4_link_rsize,
2395         },
2396         [OP_LOCK] = {
2397                 .op_func = nfsd4_lock,
2398                 .op_flags = OP_MODIFIES_SOMETHING |
2399                                 OP_NONTRIVIAL_ERROR_ENCODE,
2400                 .op_name = "OP_LOCK",
2401                 .op_rsize_bop = nfsd4_lock_rsize,
2402                 .op_set_currentstateid = nfsd4_set_lockstateid,
2403         },
2404         [OP_LOCKT] = {
2405                 .op_func = nfsd4_lockt,
2406                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2407                 .op_name = "OP_LOCKT",
2408                 .op_rsize_bop = nfsd4_lock_rsize,
2409         },
2410         [OP_LOCKU] = {
2411                 .op_func = nfsd4_locku,
2412                 .op_flags = OP_MODIFIES_SOMETHING,
2413                 .op_name = "OP_LOCKU",
2414                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2415                 .op_get_currentstateid = nfsd4_get_lockustateid,
2416         },
2417         [OP_LOOKUP] = {
2418                 .op_func = nfsd4_lookup,
2419                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2420                 .op_name = "OP_LOOKUP",
2421                 .op_rsize_bop = nfsd4_only_status_rsize,
2422         },
2423         [OP_LOOKUPP] = {
2424                 .op_func = nfsd4_lookupp,
2425                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2426                 .op_name = "OP_LOOKUPP",
2427                 .op_rsize_bop = nfsd4_only_status_rsize,
2428         },
2429         [OP_NVERIFY] = {
2430                 .op_func = nfsd4_nverify,
2431                 .op_name = "OP_NVERIFY",
2432                 .op_rsize_bop = nfsd4_only_status_rsize,
2433         },
2434         [OP_OPEN] = {
2435                 .op_func = nfsd4_open,
2436                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2437                 .op_name = "OP_OPEN",
2438                 .op_rsize_bop = nfsd4_open_rsize,
2439                 .op_set_currentstateid = nfsd4_set_openstateid,
2440         },
2441         [OP_OPEN_CONFIRM] = {
2442                 .op_func = nfsd4_open_confirm,
2443                 .op_flags = OP_MODIFIES_SOMETHING,
2444                 .op_name = "OP_OPEN_CONFIRM",
2445                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2446         },
2447         [OP_OPEN_DOWNGRADE] = {
2448                 .op_func = nfsd4_open_downgrade,
2449                 .op_flags = OP_MODIFIES_SOMETHING,
2450                 .op_name = "OP_OPEN_DOWNGRADE",
2451                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2452                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2453                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2454         },
2455         [OP_PUTFH] = {
2456                 .op_func = nfsd4_putfh,
2457                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2458                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2459                 .op_name = "OP_PUTFH",
2460                 .op_rsize_bop = nfsd4_only_status_rsize,
2461         },
2462         [OP_PUTPUBFH] = {
2463                 .op_func = nfsd4_putrootfh,
2464                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2465                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2466                 .op_name = "OP_PUTPUBFH",
2467                 .op_rsize_bop = nfsd4_only_status_rsize,
2468         },
2469         [OP_PUTROOTFH] = {
2470                 .op_func = nfsd4_putrootfh,
2471                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2472                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2473                 .op_name = "OP_PUTROOTFH",
2474                 .op_rsize_bop = nfsd4_only_status_rsize,
2475         },
2476         [OP_READ] = {
2477                 .op_func = nfsd4_read,
2478                 .op_release = nfsd4_read_release,
2479                 .op_name = "OP_READ",
2480                 .op_rsize_bop = nfsd4_read_rsize,
2481                 .op_get_currentstateid = nfsd4_get_readstateid,
2482         },
2483         [OP_READDIR] = {
2484                 .op_func = nfsd4_readdir,
2485                 .op_name = "OP_READDIR",
2486                 .op_rsize_bop = nfsd4_readdir_rsize,
2487         },
2488         [OP_READLINK] = {
2489                 .op_func = nfsd4_readlink,
2490                 .op_name = "OP_READLINK",
2491                 .op_rsize_bop = nfsd4_readlink_rsize,
2492         },
2493         [OP_REMOVE] = {
2494                 .op_func = nfsd4_remove,
2495                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2496                 .op_name = "OP_REMOVE",
2497                 .op_rsize_bop = nfsd4_remove_rsize,
2498         },
2499         [OP_RENAME] = {
2500                 .op_func = nfsd4_rename,
2501                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2502                 .op_name = "OP_RENAME",
2503                 .op_rsize_bop = nfsd4_rename_rsize,
2504         },
2505         [OP_RENEW] = {
2506                 .op_func = nfsd4_renew,
2507                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2508                                 | OP_MODIFIES_SOMETHING,
2509                 .op_name = "OP_RENEW",
2510                 .op_rsize_bop = nfsd4_only_status_rsize,
2511
2512         },
2513         [OP_RESTOREFH] = {
2514                 .op_func = nfsd4_restorefh,
2515                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2516                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2517                 .op_name = "OP_RESTOREFH",
2518                 .op_rsize_bop = nfsd4_only_status_rsize,
2519         },
2520         [OP_SAVEFH] = {
2521                 .op_func = nfsd4_savefh,
2522                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2523                 .op_name = "OP_SAVEFH",
2524                 .op_rsize_bop = nfsd4_only_status_rsize,
2525         },
2526         [OP_SECINFO] = {
2527                 .op_func = nfsd4_secinfo,
2528                 .op_release = nfsd4_secinfo_release,
2529                 .op_flags = OP_HANDLES_WRONGSEC,
2530                 .op_name = "OP_SECINFO",
2531                 .op_rsize_bop = nfsd4_secinfo_rsize,
2532         },
2533         [OP_SETATTR] = {
2534                 .op_func = nfsd4_setattr,
2535                 .op_name = "OP_SETATTR",
2536                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2537                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2538                 .op_rsize_bop = nfsd4_setattr_rsize,
2539                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2540         },
2541         [OP_SETCLIENTID] = {
2542                 .op_func = nfsd4_setclientid,
2543                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2544                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2545                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2546                 .op_name = "OP_SETCLIENTID",
2547                 .op_rsize_bop = nfsd4_setclientid_rsize,
2548         },
2549         [OP_SETCLIENTID_CONFIRM] = {
2550                 .op_func = nfsd4_setclientid_confirm,
2551                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2552                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2553                 .op_name = "OP_SETCLIENTID_CONFIRM",
2554                 .op_rsize_bop = nfsd4_only_status_rsize,
2555         },
2556         [OP_VERIFY] = {
2557                 .op_func = nfsd4_verify,
2558                 .op_name = "OP_VERIFY",
2559                 .op_rsize_bop = nfsd4_only_status_rsize,
2560         },
2561         [OP_WRITE] = {
2562                 .op_func = nfsd4_write,
2563                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2564                 .op_name = "OP_WRITE",
2565                 .op_rsize_bop = nfsd4_write_rsize,
2566                 .op_get_currentstateid = nfsd4_get_writestateid,
2567         },
2568         [OP_RELEASE_LOCKOWNER] = {
2569                 .op_func = nfsd4_release_lockowner,
2570                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2571                                 | OP_MODIFIES_SOMETHING,
2572                 .op_name = "OP_RELEASE_LOCKOWNER",
2573                 .op_rsize_bop = nfsd4_only_status_rsize,
2574         },
2575
2576         /* NFSv4.1 operations */
2577         [OP_EXCHANGE_ID] = {
2578                 .op_func = nfsd4_exchange_id,
2579                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2580                                 | OP_MODIFIES_SOMETHING,
2581                 .op_name = "OP_EXCHANGE_ID",
2582                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2583         },
2584         [OP_BACKCHANNEL_CTL] = {
2585                 .op_func = nfsd4_backchannel_ctl,
2586                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2587                 .op_name = "OP_BACKCHANNEL_CTL",
2588                 .op_rsize_bop = nfsd4_only_status_rsize,
2589         },
2590         [OP_BIND_CONN_TO_SESSION] = {
2591                 .op_func = nfsd4_bind_conn_to_session,
2592                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2593                                 | OP_MODIFIES_SOMETHING,
2594                 .op_name = "OP_BIND_CONN_TO_SESSION",
2595                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2596         },
2597         [OP_CREATE_SESSION] = {
2598                 .op_func = nfsd4_create_session,
2599                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2600                                 | OP_MODIFIES_SOMETHING,
2601                 .op_name = "OP_CREATE_SESSION",
2602                 .op_rsize_bop = nfsd4_create_session_rsize,
2603         },
2604         [OP_DESTROY_SESSION] = {
2605                 .op_func = nfsd4_destroy_session,
2606                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2607                                 | OP_MODIFIES_SOMETHING,
2608                 .op_name = "OP_DESTROY_SESSION",
2609                 .op_rsize_bop = nfsd4_only_status_rsize,
2610         },
2611         [OP_SEQUENCE] = {
2612                 .op_func = nfsd4_sequence,
2613                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2614                 .op_name = "OP_SEQUENCE",
2615                 .op_rsize_bop = nfsd4_sequence_rsize,
2616         },
2617         [OP_DESTROY_CLIENTID] = {
2618                 .op_func = nfsd4_destroy_clientid,
2619                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2620                                 | OP_MODIFIES_SOMETHING,
2621                 .op_name = "OP_DESTROY_CLIENTID",
2622                 .op_rsize_bop = nfsd4_only_status_rsize,
2623         },
2624         [OP_RECLAIM_COMPLETE] = {
2625                 .op_func = nfsd4_reclaim_complete,
2626                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2627                 .op_name = "OP_RECLAIM_COMPLETE",
2628                 .op_rsize_bop = nfsd4_only_status_rsize,
2629         },
2630         [OP_SECINFO_NO_NAME] = {
2631                 .op_func = nfsd4_secinfo_no_name,
2632                 .op_release = nfsd4_secinfo_no_name_release,
2633                 .op_flags = OP_HANDLES_WRONGSEC,
2634                 .op_name = "OP_SECINFO_NO_NAME",
2635                 .op_rsize_bop = nfsd4_secinfo_rsize,
2636         },
2637         [OP_TEST_STATEID] = {
2638                 .op_func = nfsd4_test_stateid,
2639                 .op_flags = ALLOWED_WITHOUT_FH,
2640                 .op_name = "OP_TEST_STATEID",
2641                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2642         },
2643         [OP_FREE_STATEID] = {
2644                 .op_func = nfsd4_free_stateid,
2645                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2646                 .op_name = "OP_FREE_STATEID",
2647                 .op_get_currentstateid = nfsd4_get_freestateid,
2648                 .op_rsize_bop = nfsd4_only_status_rsize,
2649         },
2650 #ifdef CONFIG_NFSD_PNFS
2651         [OP_GETDEVICEINFO] = {
2652                 .op_func = nfsd4_getdeviceinfo,
2653                 .op_release = nfsd4_getdeviceinfo_release,
2654                 .op_flags = ALLOWED_WITHOUT_FH,
2655                 .op_name = "OP_GETDEVICEINFO",
2656                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2657         },
2658         [OP_LAYOUTGET] = {
2659                 .op_func = nfsd4_layoutget,
2660                 .op_release = nfsd4_layoutget_release,
2661                 .op_flags = OP_MODIFIES_SOMETHING,
2662                 .op_name = "OP_LAYOUTGET",
2663                 .op_rsize_bop = nfsd4_layoutget_rsize,
2664         },
2665         [OP_LAYOUTCOMMIT] = {
2666                 .op_func = nfsd4_layoutcommit,
2667                 .op_flags = OP_MODIFIES_SOMETHING,
2668                 .op_name = "OP_LAYOUTCOMMIT",
2669                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2670         },
2671         [OP_LAYOUTRETURN] = {
2672                 .op_func = nfsd4_layoutreturn,
2673                 .op_flags = OP_MODIFIES_SOMETHING,
2674                 .op_name = "OP_LAYOUTRETURN",
2675                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2676         },
2677 #endif /* CONFIG_NFSD_PNFS */
2678
2679         /* NFSv4.2 operations */
2680         [OP_ALLOCATE] = {
2681                 .op_func = nfsd4_allocate,
2682                 .op_flags = OP_MODIFIES_SOMETHING,
2683                 .op_name = "OP_ALLOCATE",
2684                 .op_rsize_bop = nfsd4_only_status_rsize,
2685         },
2686         [OP_DEALLOCATE] = {
2687                 .op_func = nfsd4_deallocate,
2688                 .op_flags = OP_MODIFIES_SOMETHING,
2689                 .op_name = "OP_DEALLOCATE",
2690                 .op_rsize_bop = nfsd4_only_status_rsize,
2691         },
2692         [OP_CLONE] = {
2693                 .op_func = nfsd4_clone,
2694                 .op_flags = OP_MODIFIES_SOMETHING,
2695                 .op_name = "OP_CLONE",
2696                 .op_rsize_bop = nfsd4_only_status_rsize,
2697         },
2698         [OP_COPY] = {
2699                 .op_func = nfsd4_copy,
2700                 .op_flags = OP_MODIFIES_SOMETHING,
2701                 .op_name = "OP_COPY",
2702                 .op_rsize_bop = nfsd4_copy_rsize,
2703         },
2704         [OP_SEEK] = {
2705                 .op_func = nfsd4_seek,
2706                 .op_name = "OP_SEEK",
2707                 .op_rsize_bop = nfsd4_seek_rsize,
2708         },
2709         [OP_OFFLOAD_STATUS] = {
2710                 .op_func = nfsd4_offload_status,
2711                 .op_name = "OP_OFFLOAD_STATUS",
2712                 .op_rsize_bop = nfsd4_offload_status_rsize,
2713         },
2714         [OP_OFFLOAD_CANCEL] = {
2715                 .op_func = nfsd4_offload_cancel,
2716                 .op_flags = OP_MODIFIES_SOMETHING,
2717                 .op_name = "OP_OFFLOAD_CANCEL",
2718                 .op_rsize_bop = nfsd4_only_status_rsize,
2719         },
2720 };
2721
2722 /**
2723  * nfsd4_spo_must_allow - Determine if the compound op contains an
2724  * operation that is allowed to be sent with machine credentials
2725  *
2726  * @rqstp: a pointer to the struct svc_rqst
2727  *
2728  * Checks to see if the compound contains a spo_must_allow op
2729  * and confirms that it was sent with the proper machine creds.
2730  */
2731
2732 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2733 {
2734         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2735         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2736         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2737         struct nfsd4_compound_state *cstate = &resp->cstate;
2738         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2739         u32 opiter;
2740
2741         if (!cstate->minorversion)
2742                 return false;
2743
2744         if (cstate->spo_must_allowed == true)
2745                 return true;
2746
2747         opiter = resp->opcnt;
2748         while (opiter < argp->opcnt) {
2749                 this = &argp->ops[opiter++];
2750                 if (test_bit(this->opnum, allow->u.longs) &&
2751                         cstate->clp->cl_mach_cred &&
2752                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2753                         cstate->spo_must_allowed = true;
2754                         return true;
2755                 }
2756         }
2757         cstate->spo_must_allowed = false;
2758         return false;
2759 }
2760
2761 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2762 {
2763         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2764                 return op_encode_hdr_size * sizeof(__be32);
2765
2766         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2767         return OPDESC(op)->op_rsize_bop(rqstp, op);
2768 }
2769
2770 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2771 {
2772         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2773                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2774                         op->opnum, nfsd4_op_name(op->opnum));
2775                 WARN_ON_ONCE(1);
2776         }
2777 }
2778
2779 static const char *nfsd4_op_name(unsigned opnum)
2780 {
2781         if (opnum < ARRAY_SIZE(nfsd4_ops))
2782                 return nfsd4_ops[opnum].op_name;
2783         return "unknown_operation";
2784 }
2785
2786 #define nfsd4_voidres                   nfsd4_voidargs
2787 struct nfsd4_voidargs { int dummy; };
2788
2789 static const struct svc_procedure nfsd_procedures4[2] = {
2790         [NFSPROC4_NULL] = {
2791                 .pc_func = nfsd4_proc_null,
2792                 .pc_encode = nfs4svc_encode_voidres,
2793                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2794                 .pc_ressize = sizeof(struct nfsd4_voidres),
2795                 .pc_cachetype = RC_NOCACHE,
2796                 .pc_xdrressize = 1,
2797         },
2798         [NFSPROC4_COMPOUND] = {
2799                 .pc_func = nfsd4_proc_compound,
2800                 .pc_decode = nfs4svc_decode_compoundargs,
2801                 .pc_encode = nfs4svc_encode_compoundres,
2802                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2803                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2804                 .pc_release = nfsd4_release_compoundargs,
2805                 .pc_cachetype = RC_NOCACHE,
2806                 .pc_xdrressize = NFSD_BUFSIZE/4,
2807         },
2808 };
2809
2810 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2811 const struct svc_version nfsd_version4 = {
2812         .vs_vers                = 4,
2813         .vs_nproc               = 2,
2814         .vs_proc                = nfsd_procedures4,
2815         .vs_count               = nfsd_count3,
2816         .vs_dispatch            = nfsd_dispatch,
2817         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2818         .vs_rpcb_optnl          = true,
2819         .vs_need_cong_ctrl      = true,
2820 };
2821
2822 /*
2823  * Local variables:
2824  *  c-basic-offset: 8
2825  * End:
2826  */