fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/falloc.h>
  37 #include <linux/slab.h>
  38
  39 #include "idmap.h"
  40 #include "cache.h"
  41 #include "xdr4.h"
  42 #include "vfs.h"
  43 #include "current_stateid.h"
  44 #include "netns.h"
  45 #include "acl.h"
  46 #include "pnfs.h"
  47 #include "trace.h"
  48
  49 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  50 #include <linux/security.h>
  51
  52 static inline void
  53 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  54 {
  55         struct inode *inode = d_inode(resfh->fh_dentry);
  56         int status;
  57
  58         inode_lock(inode);
  59         status = security_inode_setsecctx(resfh->fh_dentry,
  60                 label->data, label->len);
  61         inode_unlock(inode);
  62
  63         if (status)
  64                 /*
  65                  * XXX: We should really fail the whole open, but we may
  66                  * already have created a new file, so it may be too
  67                  * late.  For now this seems the least of evils:
  68                  */
  69                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  70
  71         return;
  72 }
  73 #else
  74 static inline void
  75 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  76 { }
  77 #endif
  78
  79 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  80
  81 static u32 nfsd_attrmask[] = {
  82         NFSD_WRITEABLE_ATTRS_WORD0,
  83         NFSD_WRITEABLE_ATTRS_WORD1,
  84         NFSD_WRITEABLE_ATTRS_WORD2
  85 };
  86
  87 static u32 nfsd41_ex_attrmask[] = {
  88         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  89         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  90         NFSD_SUPPATTR_EXCLCREAT_WORD2
  91 };
  92
  93 static __be32
  94 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  95                    u32 *bmval, u32 *writable)
  96 {
  97         struct dentry *dentry = cstate->current_fh.fh_dentry;
  98         struct svc_export *exp = cstate->current_fh.fh_export;
  99
 100         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
 101                 return nfserr_attrnotsupp;
 102         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
 103                 return nfserr_attrnotsupp;
 104         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
 105                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
 106                 return nfserr_attrnotsupp;
 107         if (writable && !bmval_is_subset(bmval, writable))
 108                 return nfserr_inval;
 109         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
 110                         (bmval[1] & FATTR4_WORD1_MODE))
 111                 return nfserr_inval;
 112         return nfs_ok;
 113 }
 114
 115 static __be32
 116 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 117         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 118 {
 119         __be32 status = nfs_ok;
 120
 121         if (open->op_create == NFS4_OPEN_CREATE) {
 122                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 123                     || open->op_createmode == NFS4_CREATE_GUARDED)
 124                         status = check_attr_support(rqstp, cstate,
 125                                         open->op_bmval, nfsd_attrmask);
 126                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 127                         status = check_attr_support(rqstp, cstate,
 128                                         open->op_bmval, nfsd41_ex_attrmask);
 129         }
 130
 131         return status;
 132 }
 133
 134 static int
 135 is_create_with_attrs(struct nfsd4_open *open)
 136 {
 137         return open->op_create == NFS4_OPEN_CREATE
 138                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 139                     || open->op_createmode == NFS4_CREATE_GUARDED
 140                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 141 }
 142
 143 /*
 144  * if error occurs when setting the acl, just clear the acl bit
 145  * in the returned attr bitmap.
 146  */
 147 static void
 148 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 149                 struct nfs4_acl *acl, u32 *bmval)
 150 {
 151         __be32 status;
 152
 153         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 154         if (status)
 155                 /*
 156                  * We should probably fail the whole open at this point,
 157                  * but we've already created the file, so it's too late;
 158                  * So this seems the least of evils:
 159                  */
 160                 bmval[0] &= ~FATTR4_WORD0_ACL;
 161 }
 162
 163 static inline void
 164 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 165 {
 166         fh_put(dst);
 167         dget(src->fh_dentry);
 168         if (src->fh_export)
 169                 exp_get(src->fh_export);
 170         *dst = *src;
 171 }
 172
 173 static __be32
 174 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 175 {
 176         __be32 status;
 177
 178         if (open->op_truncate &&
 179                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 180                 return nfserr_inval;
 181
 182         accmode |= NFSD_MAY_READ_IF_EXEC;
 183
 184         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 185                 accmode |= NFSD_MAY_READ;
 186         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 187                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 188         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 189                 accmode |= NFSD_MAY_WRITE;
 190
 191         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 192
 193         return status;
 194 }
 195
 196 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 197 {
 198         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 199
 200         if (S_ISREG(mode))
 201                 return nfs_ok;
 202         if (S_ISDIR(mode))
 203                 return nfserr_isdir;
 204         /*
 205          * Using err_symlink as our catch-all case may look odd; but
 206          * there's no other obvious error for this case in 4.0, and we
 207          * happen to know that it will cause the linux v4 client to do
 208          * the right thing on attempts to open something other than a
 209          * regular file.
 210          */
 211         return nfserr_symlink;
 212 }
 213
 214 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 215 {
 216         if (nfsd4_has_session(cstate))
 217                 return;
 218         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 219                         &resfh->fh_handle);
 220 }
 221
 222 static __be32
 223 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 224 {
 225         struct svc_fh *current_fh = &cstate->current_fh;
 226         int accmode;
 227         __be32 status;
 228
 229         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 230         if (!*resfh)
 231                 return nfserr_jukebox;
 232         fh_init(*resfh, NFS4_FHSIZE);
 233         open->op_truncate = 0;
 234
 235         if (open->op_create) {
 236                 /* FIXME: check session persistence and pnfs flags.
 237                  * The nfsv4.1 spec requires the following semantics:
 238                  *
 239                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 240                  * Reply Cache  | server |                 |
 241                  * -------------+--------+-----------------+--------------------
 242                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 243                  *              |        |                 | (SHOULD)
 244                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 245                  *              |        |                 | (SHOULD NOT)
 246                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 247                  * yes          | no     | GUARDED4        | GUARDED4
 248                  * yes          | yes    | GUARDED4        | GUARDED4
 249                  */
 250
 251                 /*
 252                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 253                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 254                  */
 255                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 256                                         open->op_fname.len, &open->op_iattr,
 257                                         *resfh, open->op_createmode,
 258                                         (u32 *)open->op_verf.data,
 259                                         &open->op_truncate, &open->op_created);
 260
 261                 if (!status && open->op_label.len)
 262                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 263
 264                 /*
 265                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 266                  * use the returned bitmask to indicate which attributes
 267                  * we used to store the verifier:
 268                  */
 269                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 270                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 271                                                 FATTR4_WORD1_TIME_MODIFY);
 272         } else
 273                 /*
 274                  * Note this may exit with the parent still locked.
 275                  * We will hold the lock until nfsd4_open's final
 276                  * lookup, to prevent renames or unlinks until we've had
 277                  * a chance to an acquire a delegation if appropriate.
 278                  */
 279                 status = nfsd_lookup(rqstp, current_fh,
 280                                      open->op_fname.data, open->op_fname.len, *resfh);
 281         if (status)
 282                 goto out;
 283         status = nfsd_check_obj_isreg(*resfh);
 284         if (status)
 285                 goto out;
 286
 287         if (is_create_with_attrs(open) && open->op_acl != NULL)
 288                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 289
 290         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 291         accmode = NFSD_MAY_NOP;
 292         if (open->op_created ||
 293                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 294                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 295         status = do_open_permission(rqstp, *resfh, open, accmode);
 296         set_change_info(&open->op_cinfo, current_fh);
 297 out:
 298         return status;
 299 }
 300
 301 static __be32
 302 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 303 {
 304         struct svc_fh *current_fh = &cstate->current_fh;
 305         __be32 status;
 306         int accmode = 0;
 307
 308         /* We don't know the target directory, and therefore can not
 309         * set the change info
 310         */
 311
 312         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 313
 314         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 315
 316         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 317                 (open->op_iattr.ia_size == 0);
 318         /*
 319          * In the delegation case, the client is telling us about an
 320          * open that it *already* performed locally, some time ago.  We
 321          * should let it succeed now if possible.
 322          *
 323          * In the case of a CLAIM_FH open, on the other hand, the client
 324          * may be counting on us to enforce permissions (the Linux 4.1
 325          * client uses this for normal opens, for example).
 326          */
 327         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 328                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 329
 330         status = do_open_permission(rqstp, current_fh, open, accmode);
 331
 332         return status;
 333 }
 334
 335 static void
 336 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 337 {
 338         struct nfsd4_sessionid *sid =
 339                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 340
 341         clid->cl_boot = sid->clientid.cl_boot;
 342         clid->cl_id = sid->clientid.cl_id;
 343 }
 344
 345 static __be32
 346 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 347            union nfsd4_op_u *u)
 348 {
 349         struct nfsd4_open *open = &u->open;
 350         __be32 status;
 351         struct svc_fh *resfh = NULL;
 352         struct net *net = SVC_NET(rqstp);
 353         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 354
 355         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 356                 (int)open->op_fname.len, open->op_fname.data,
 357                 open->op_openowner);
 358
 359         /* This check required by spec. */
 360         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 361                 return nfserr_inval;
 362
 363         open->op_created = 0;
 364         /*
 365          * RFC5661 18.51.3
 366          * Before RECLAIM_COMPLETE done, server should deny new lock
 367          */
 368         if (nfsd4_has_session(cstate) &&
 369             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 370                       &cstate->session->se_client->cl_flags) &&
 371             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 372                 return nfserr_grace;
 373
 374         if (nfsd4_has_session(cstate))
 375                 copy_clientid(&open->op_clientid, cstate->session);
 376
 377         /* check seqid for replay. set nfs4_owner */
 378         status = nfsd4_process_open1(cstate, open, nn);
 379         if (status == nfserr_replay_me) {
 380                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 381                 fh_put(&cstate->current_fh);
 382                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 383                                 &rp->rp_openfh);
 384                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 385                 if (status)
 386                         dprintk("nfsd4_open: replay failed"
 387                                 " restoring previous filehandle\n");
 388                 else
 389                         status = nfserr_replay_me;
 390         }
 391         if (status)
 392                 goto out;
 393         if (open->op_xdr_error) {
 394                 status = open->op_xdr_error;
 395                 goto out;
 396         }
 397
 398         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 399         if (status)
 400                 goto out;
 401
 402         /* Openowner is now set, so sequence id will get bumped.  Now we need
 403          * these checks before we do any creates: */
 404         status = nfserr_grace;
 405         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 406                 goto out;
 407         status = nfserr_no_grace;
 408         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 409                 goto out;
 410
 411         switch (open->op_claim_type) {
 412                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 413                 case NFS4_OPEN_CLAIM_NULL:
 414                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 415                         if (status)
 416                                 goto out;
 417                         break;
 418                 case NFS4_OPEN_CLAIM_PREVIOUS:
 419                         status = nfs4_check_open_reclaim(&open->op_clientid,
 420                                                          cstate, nn);
 421                         if (status)
 422                                 goto out;
 423                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 424                 case NFS4_OPEN_CLAIM_FH:
 425                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 426                         status = do_open_fhandle(rqstp, cstate, open);
 427                         if (status)
 428                                 goto out;
 429                         resfh = &cstate->current_fh;
 430                         break;
 431                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 432                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 433                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 434                                 open->op_claim_type);
 435                         status = nfserr_notsupp;
 436                         goto out;
 437                 default:
 438                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 439                                 open->op_claim_type);
 440                         status = nfserr_inval;
 441                         goto out;
 442         }
 443         /*
 444          * nfsd4_process_open2() does the actual opening of the file.  If
 445          * successful, it (1) truncates the file if open->op_truncate was
 446          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 447          */
 448         status = nfsd4_process_open2(rqstp, resfh, open);
 449         WARN(status && open->op_created,
 450              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 451              be32_to_cpu(status));
 452 out:
 453         if (resfh && resfh != &cstate->current_fh) {
 454                 fh_dup2(&cstate->current_fh, resfh);
 455                 fh_put(resfh);
 456                 kfree(resfh);
 457         }
 458         nfsd4_cleanup_open_state(cstate, open);
 459         nfsd4_bump_seqid(cstate, status);
 460         return status;
 461 }
 462
 463 /*
 464  * OPEN is the only seqid-mutating operation whose decoding can fail
 465  * with a seqid-mutating error (specifically, decoding of user names in
 466  * the attributes).  Therefore we have to do some processing to look up
 467  * the stateowner so that we can bump the seqid.
 468  */
 469 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 470 {
 471         struct nfsd4_open *open = &op->u.open;
 472
 473         if (!seqid_mutating_err(ntohl(op->status)))
 474                 return op->status;
 475         if (nfsd4_has_session(cstate))
 476                 return op->status;
 477         open->op_xdr_error = op->status;
 478         return nfsd4_open(rqstp, cstate, &op->u);
 479 }
 480
 481 /*
 482  * filehandle-manipulating ops.
 483  */
 484 static __be32
 485 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 486             union nfsd4_op_u *u)
 487 {
 488         if (!cstate->current_fh.fh_dentry)
 489                 return nfserr_nofilehandle;
 490
 491         u->getfh = &cstate->current_fh;
 492         return nfs_ok;
 493 }
 494
 495 static __be32
 496 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 497             union nfsd4_op_u *u)
 498 {
 499         struct nfsd4_putfh *putfh = &u->putfh;
 500
 501         fh_put(&cstate->current_fh);
 502         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 503         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 504                putfh->pf_fhlen);
 505         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 506 }
 507
 508 static __be32
 509 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510                 union nfsd4_op_u *u)
 511 {
 512         __be32 status;
 513
 514         fh_put(&cstate->current_fh);
 515         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 516         return status;
 517 }
 518
 519 static __be32
 520 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 521                 union nfsd4_op_u *u)
 522 {
 523         if (!cstate->save_fh.fh_dentry)
 524                 return nfserr_restorefh;
 525
 526         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 527         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 528                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 529                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 530         }
 531         return nfs_ok;
 532 }
 533
 534 static __be32
 535 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 536              union nfsd4_op_u *u)
 537 {
 538         if (!cstate->current_fh.fh_dentry)
 539                 return nfserr_nofilehandle;
 540
 541         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 542         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 543                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 544                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 545         }
 546         return nfs_ok;
 547 }
 548
 549 /*
 550  * misc nfsv4 ops
 551  */
 552 static __be32
 553 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 554              union nfsd4_op_u *u)
 555 {
 556         struct nfsd4_access *access = &u->access;
 557
 558         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 559                 return nfserr_inval;
 560
 561         access->ac_resp_access = access->ac_req_access;
 562         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 563                            &access->ac_supported);
 564 }
 565
 566 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 567 {
 568         __be32 verf[2];
 569         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 570
 571         /*
 572          * This is opaque to client, so no need to byte-swap. Use
 573          * __force to keep sparse happy
 574          */
 575         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 576         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 577         memcpy(verifier->data, verf, sizeof(verifier->data));
 578 }
 579
 580 static __be32
 581 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 582              union nfsd4_op_u *u)
 583 {
 584         struct nfsd4_commit *commit = &u->commit;
 585
 586         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 587         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 588                              commit->co_count);
 589 }
 590
 591 static __be32
 592 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 593              union nfsd4_op_u *u)
 594 {
 595         struct nfsd4_create *create = &u->create;
 596         struct svc_fh resfh;
 597         __be32 status;
 598         dev_t rdev;
 599
 600         fh_init(&resfh, NFS4_FHSIZE);
 601
 602         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 603         if (status)
 604                 return status;
 605
 606         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 607                                     nfsd_attrmask);
 608         if (status)
 609                 return status;
 610
 611         switch (create->cr_type) {
 612         case NF4LNK:
 613                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 614                                       create->cr_name, create->cr_namelen,
 615                                       create->cr_data, &resfh);
 616                 break;
 617
 618         case NF4BLK:
 619                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 620                 if (MAJOR(rdev) != create->cr_specdata1 ||
 621                     MINOR(rdev) != create->cr_specdata2)
 622                         return nfserr_inval;
 623                 status = nfsd_create(rqstp, &cstate->current_fh,
 624                                      create->cr_name, create->cr_namelen,
 625                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 626                 break;
 627
 628         case NF4CHR:
 629                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 630                 if (MAJOR(rdev) != create->cr_specdata1 ||
 631                     MINOR(rdev) != create->cr_specdata2)
 632                         return nfserr_inval;
 633                 status = nfsd_create(rqstp, &cstate->current_fh,
 634                                      create->cr_name, create->cr_namelen,
 635                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 636                 break;
 637
 638         case NF4SOCK:
 639                 status = nfsd_create(rqstp, &cstate->current_fh,
 640                                      create->cr_name, create->cr_namelen,
 641                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 642                 break;
 643
 644         case NF4FIFO:
 645                 status = nfsd_create(rqstp, &cstate->current_fh,
 646                                      create->cr_name, create->cr_namelen,
 647                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 648                 break;
 649
 650         case NF4DIR:
 651                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 652                 status = nfsd_create(rqstp, &cstate->current_fh,
 653                                      create->cr_name, create->cr_namelen,
 654                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 655                 break;
 656
 657         default:
 658                 status = nfserr_badtype;
 659         }
 660
 661         if (status)
 662                 goto out;
 663
 664         if (create->cr_label.len)
 665                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 666
 667         if (create->cr_acl != NULL)
 668                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 669                                 create->cr_bmval);
 670
 671         fh_unlock(&cstate->current_fh);
 672         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 673         fh_dup2(&cstate->current_fh, &resfh);
 674 out:
 675         fh_put(&resfh);
 676         return status;
 677 }
 678
 679 static __be32
 680 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 681               union nfsd4_op_u *u)
 682 {
 683         struct nfsd4_getattr *getattr = &u->getattr;
 684         __be32 status;
 685
 686         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 687         if (status)
 688                 return status;
 689
 690         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 691                 return nfserr_inval;
 692
 693         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 694         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 695         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 696
 697         getattr->ga_fhp = &cstate->current_fh;
 698         return nfs_ok;
 699 }
 700
 701 static __be32
 702 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 703            union nfsd4_op_u *u)
 704 {
 705         struct nfsd4_link *link = &u->link;
 706         __be32 status = nfserr_nofilehandle;
 707
 708         if (!cstate->save_fh.fh_dentry)
 709                 return status;
 710         status = nfsd_link(rqstp, &cstate->current_fh,
 711                            link->li_name, link->li_namelen, &cstate->save_fh);
 712         if (!status)
 713                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 714         return status;
 715 }
 716
 717 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 718 {
 719         struct svc_fh tmp_fh;
 720         __be32 ret;
 721
 722         fh_init(&tmp_fh, NFS4_FHSIZE);
 723         ret = exp_pseudoroot(rqstp, &tmp_fh);
 724         if (ret)
 725                 return ret;
 726         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 727                 fh_put(&tmp_fh);
 728                 return nfserr_noent;
 729         }
 730         fh_put(&tmp_fh);
 731         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 732 }
 733
 734 static __be32
 735 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 736               union nfsd4_op_u *u)
 737 {
 738         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 739 }
 740
 741 static __be32
 742 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 743              union nfsd4_op_u *u)
 744 {
 745         return nfsd_lookup(rqstp, &cstate->current_fh,
 746                            u->lookup.lo_name, u->lookup.lo_len,
 747                            &cstate->current_fh);
 748 }
 749
 750 static __be32
 751 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 752            union nfsd4_op_u *u)
 753 {
 754         struct nfsd4_read *read = &u->read;
 755         __be32 status;
 756
 757         read->rd_filp = NULL;
 758         if (read->rd_offset >= OFFSET_MAX)
 759                 return nfserr_inval;
 760
 761         /*
 762          * If we do a zero copy read, then a client will see read data
 763          * that reflects the state of the file *after* performing the
 764          * following compound.
 765          *
 766          * To ensure proper ordering, we therefore turn off zero copy if
 767          * the client wants us to do more in this compound:
 768          */
 769         if (!nfsd4_last_compound_op(rqstp))
 770                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 771
 772         /* check stateid */
 773         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 774                                         &read->rd_stateid, RD_STATE,
 775                                         &read->rd_filp, &read->rd_tmp_file);
 776         if (status) {
 777                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 778                 goto out;
 779         }
 780         status = nfs_ok;
 781 out:
 782         read->rd_rqstp = rqstp;
 783         read->rd_fhp = &cstate->current_fh;
 784         return status;
 785 }
 786
 787 static __be32
 788 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 789               union nfsd4_op_u *u)
 790 {
 791         struct nfsd4_readdir *readdir = &u->readdir;
 792         u64 cookie = readdir->rd_cookie;
 793         static const nfs4_verifier zeroverf;
 794
 795         /* no need to check permission - this will be done in nfsd_readdir() */
 796
 797         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 798                 return nfserr_inval;
 799
 800         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 801         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 802         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 803
 804         if ((cookie == 1) || (cookie == 2) ||
 805             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 806                 return nfserr_bad_cookie;
 807
 808         readdir->rd_rqstp = rqstp;
 809         readdir->rd_fhp = &cstate->current_fh;
 810         return nfs_ok;
 811 }
 812
 813 static __be32
 814 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 815                union nfsd4_op_u *u)
 816 {
 817         u->readlink.rl_rqstp = rqstp;
 818         u->readlink.rl_fhp = &cstate->current_fh;
 819         return nfs_ok;
 820 }
 821
 822 static __be32
 823 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 824              union nfsd4_op_u *u)
 825 {
 826         struct nfsd4_remove *remove = &u->remove;
 827         __be32 status;
 828
 829         if (opens_in_grace(SVC_NET(rqstp)))
 830                 return nfserr_grace;
 831         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 832                              remove->rm_name, remove->rm_namelen);
 833         if (!status) {
 834                 fh_unlock(&cstate->current_fh);
 835                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 836         }
 837         return status;
 838 }
 839
 840 static __be32
 841 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 842              union nfsd4_op_u *u)
 843 {
 844         struct nfsd4_rename *rename = &u->rename;
 845         __be32 status = nfserr_nofilehandle;
 846
 847         if (!cstate->save_fh.fh_dentry)
 848                 return status;
 849         if (opens_in_grace(SVC_NET(rqstp)) &&
 850                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 851                 return nfserr_grace;
 852         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 853                              rename->rn_snamelen, &cstate->current_fh,
 854                              rename->rn_tname, rename->rn_tnamelen);
 855         if (status)
 856                 return status;
 857         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 858         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 859         return nfs_ok;
 860 }
 861
 862 static __be32
 863 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 864               union nfsd4_op_u *u)
 865 {
 866         struct nfsd4_secinfo *secinfo = &u->secinfo;
 867         struct svc_export *exp;
 868         struct dentry *dentry;
 869         __be32 err;
 870
 871         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 872         if (err)
 873                 return err;
 874         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 875                                     secinfo->si_name, secinfo->si_namelen,
 876                                     &exp, &dentry);
 877         if (err)
 878                 return err;
 879         fh_unlock(&cstate->current_fh);
 880         if (d_really_is_negative(dentry)) {
 881                 exp_put(exp);
 882                 err = nfserr_noent;
 883         } else
 884                 secinfo->si_exp = exp;
 885         dput(dentry);
 886         if (cstate->minorversion)
 887                 /* See rfc 5661 section 2.6.3.1.1.8 */
 888                 fh_put(&cstate->current_fh);
 889         return err;
 890 }
 891
 892 static __be32
 893 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 894                 union nfsd4_op_u *u)
 895 {
 896         __be32 err;
 897
 898         switch (u->secinfo_no_name.sin_style) {
 899         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 900                 break;
 901         case NFS4_SECINFO_STYLE4_PARENT:
 902                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 903                 if (err)
 904                         return err;
 905                 break;
 906         default:
 907                 return nfserr_inval;
 908         }
 909
 910         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 911         fh_put(&cstate->current_fh);
 912         return nfs_ok;
 913 }
 914
 915 static __be32
 916 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 917               union nfsd4_op_u *u)
 918 {
 919         struct nfsd4_setattr *setattr = &u->setattr;
 920         __be32 status = nfs_ok;
 921         int err;
 922
 923         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 924                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 925                                 &cstate->current_fh, &setattr->sa_stateid,
 926                                 WR_STATE, NULL, NULL);
 927                 if (status) {
 928                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 929                         return status;
 930                 }
 931         }
 932         err = fh_want_write(&cstate->current_fh);
 933         if (err)
 934                 return nfserrno(err);
 935         status = nfs_ok;
 936
 937         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 938                                     nfsd_attrmask);
 939         if (status)
 940                 goto out;
 941
 942         if (setattr->sa_acl != NULL)
 943                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 944                                             setattr->sa_acl);
 945         if (status)
 946                 goto out;
 947         if (setattr->sa_label.len)
 948                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 949                                 &setattr->sa_label);
 950         if (status)
 951                 goto out;
 952         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 953                                 0, (time_t)0);
 954 out:
 955         fh_drop_write(&cstate->current_fh);
 956         return status;
 957 }
 958
 959 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 960 {
 961         int i = 1;
 962         int buflen = write->wr_buflen;
 963
 964         vec[0].iov_base = write->wr_head.iov_base;
 965         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 966         buflen -= vec[0].iov_len;
 967
 968         while (buflen) {
 969                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 970                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 971                 buflen -= vec[i].iov_len;
 972                 i++;
 973         }
 974         return i;
 975 }
 976
 977 static __be32
 978 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 979             union nfsd4_op_u *u)
 980 {
 981         struct nfsd4_write *write = &u->write;
 982         stateid_t *stateid = &write->wr_stateid;
 983         struct file *filp = NULL;
 984         __be32 status = nfs_ok;
 985         unsigned long cnt;
 986         int nvecs;
 987
 988         if (write->wr_offset >= OFFSET_MAX)
 989                 return nfserr_inval;
 990
 991         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 992                                                 stateid, WR_STATE, &filp, NULL);
 993         if (status) {
 994                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 995                 return status;
 996         }
 997
 998         cnt = write->wr_buflen;
 999         write->wr_how_written = write->wr_stable_how;
1000         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1001
1002         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1003         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1004
1005         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1006                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1007                                 write->wr_how_written);
1008         fput(filp);
1009
1010         write->wr_bytes_written = cnt;
1011
1012         return status;
1013 }
1014
1015 static __be32
1016 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1017                   stateid_t *src_stateid, struct file **src,
1018                   stateid_t *dst_stateid, struct file **dst)
1019 {
1020         __be32 status;
1021
1022         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1023                                             src_stateid, RD_STATE, src, NULL);
1024         if (status) {
1025                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1026                 goto out;
1027         }
1028
1029         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1030                                             dst_stateid, WR_STATE, dst, NULL);
1031         if (status) {
1032                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1033                 goto out_put_src;
1034         }
1035
1036         /* fix up for NFS-specific error code */
1037         if (!S_ISREG(file_inode(*src)->i_mode) ||
1038             !S_ISREG(file_inode(*dst)->i_mode)) {
1039                 status = nfserr_wrong_type;
1040                 goto out_put_dst;
1041         }
1042
1043 out:
1044         return status;
1045 out_put_dst:
1046         fput(*dst);
1047 out_put_src:
1048         fput(*src);
1049         goto out;
1050 }
1051
1052 static __be32
1053 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1054                 union nfsd4_op_u *u)
1055 {
1056         struct nfsd4_clone *clone = &u->clone;
1057         struct file *src, *dst;
1058         __be32 status;
1059
1060         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1061                                    &clone->cl_dst_stateid, &dst);
1062         if (status)
1063                 goto out;
1064
1065         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1066                         dst, clone->cl_dst_pos, clone->cl_count);
1067
1068         fput(dst);
1069         fput(src);
1070 out:
1071         return status;
1072 }
1073
1074 static __be32
1075 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1076                 union nfsd4_op_u *u)
1077 {
1078         struct nfsd4_copy *copy = &u->copy;
1079         struct file *src, *dst;
1080         __be32 status;
1081         ssize_t bytes;
1082
1083         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1084                                    &copy->cp_dst_stateid, &dst);
1085         if (status)
1086                 goto out;
1087
1088         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1089                         dst, copy->cp_dst_pos, copy->cp_count);
1090
1091         if (bytes < 0)
1092                 status = nfserrno(bytes);
1093         else {
1094                 copy->cp_res.wr_bytes_written = bytes;
1095                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1096                 copy->cp_consecutive = 1;
1097                 copy->cp_synchronous = 1;
1098                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1099                 status = nfs_ok;
1100         }
1101
1102         fput(src);
1103         fput(dst);
1104 out:
1105         return status;
1106 }
1107
1108 static __be32
1109 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1110                 struct nfsd4_fallocate *fallocate, int flags)
1111 {
1112         __be32 status = nfserr_notsupp;
1113         struct file *file;
1114
1115         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1116                                             &fallocate->falloc_stateid,
1117                                             WR_STATE, &file, NULL);
1118         if (status != nfs_ok) {
1119                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1120                 return status;
1121         }
1122
1123         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1124                                      fallocate->falloc_offset,
1125                                      fallocate->falloc_length,
1126                                      flags);
1127         fput(file);
1128         return status;
1129 }
1130
1131 static __be32
1132 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1133                union nfsd4_op_u *u)
1134 {
1135         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1136 }
1137
1138 static __be32
1139 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1140                  union nfsd4_op_u *u)
1141 {
1142         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1143                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1144 }
1145
1146 static __be32
1147 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1148            union nfsd4_op_u *u)
1149 {
1150         struct nfsd4_seek *seek = &u->seek;
1151         int whence;
1152         __be32 status;
1153         struct file *file;
1154
1155         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1156                                             &seek->seek_stateid,
1157                                             RD_STATE, &file, NULL);
1158         if (status) {
1159                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1160                 return status;
1161         }
1162
1163         switch (seek->seek_whence) {
1164         case NFS4_CONTENT_DATA:
1165                 whence = SEEK_DATA;
1166                 break;
1167         case NFS4_CONTENT_HOLE:
1168                 whence = SEEK_HOLE;
1169                 break;
1170         default:
1171                 status = nfserr_union_notsupp;
1172                 goto out;
1173         }
1174
1175         /*
1176          * Note:  This call does change file->f_pos, but nothing in NFSD
1177          *        should ever file->f_pos.
1178          */
1179         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1180         if (seek->seek_pos < 0)
1181                 status = nfserrno(seek->seek_pos);
1182         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1183                 seek->seek_eof = true;
1184
1185 out:
1186         fput(file);
1187         return status;
1188 }
1189
1190 /* This routine never returns NFS_OK!  If there are no other errors, it
1191  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1192  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1193  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1194  */
1195 static __be32
1196 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1197              struct nfsd4_verify *verify)
1198 {
1199         __be32 *buf, *p;
1200         int count;
1201         __be32 status;
1202
1203         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1204         if (status)
1205                 return status;
1206
1207         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1208         if (status)
1209                 return status;
1210
1211         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1212             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1213                 return nfserr_inval;
1214         if (verify->ve_attrlen & 3)
1215                 return nfserr_inval;
1216
1217         /* count in words:
1218          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1219          */
1220         count = 4 + (verify->ve_attrlen >> 2);
1221         buf = kmalloc(count << 2, GFP_KERNEL);
1222         if (!buf)
1223                 return nfserr_jukebox;
1224
1225         p = buf;
1226         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1227                                     cstate->current_fh.fh_export,
1228                                     cstate->current_fh.fh_dentry,
1229                                     verify->ve_bmval,
1230                                     rqstp, 0);
1231         /*
1232          * If nfsd4_encode_fattr() ran out of space, assume that's because
1233          * the attributes are longer (hence different) than those given:
1234          */
1235         if (status == nfserr_resource)
1236                 status = nfserr_not_same;
1237         if (status)
1238                 goto out_kfree;
1239
1240         /* skip bitmap */
1241         p = buf + 1 + ntohl(buf[0]);
1242         status = nfserr_not_same;
1243         if (ntohl(*p++) != verify->ve_attrlen)
1244                 goto out_kfree;
1245         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1246                 status = nfserr_same;
1247
1248 out_kfree:
1249         kfree(buf);
1250         return status;
1251 }
1252
1253 static __be32
1254 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1255               union nfsd4_op_u *u)
1256 {
1257         __be32 status;
1258
1259         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1260         return status == nfserr_not_same ? nfs_ok : status;
1261 }
1262
1263 static __be32
1264 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1265              union nfsd4_op_u *u)
1266 {
1267         __be32 status;
1268
1269         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1270         return status == nfserr_same ? nfs_ok : status;
1271 }
1272
1273 #ifdef CONFIG_NFSD_PNFS
1274 static const struct nfsd4_layout_ops *
1275 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1276 {
1277         if (!exp->ex_layout_types) {
1278                 dprintk("%s: export does not support pNFS\n", __func__);
1279                 return NULL;
1280         }
1281
1282         if (layout_type >= LAYOUT_TYPE_MAX ||
1283             !(exp->ex_layout_types & (1 << layout_type))) {
1284                 dprintk("%s: layout type %d not supported\n",
1285                         __func__, layout_type);
1286                 return NULL;
1287         }
1288
1289         return nfsd4_layout_ops[layout_type];
1290 }
1291
1292 static __be32
1293 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1294                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1295 {
1296         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1297         const struct nfsd4_layout_ops *ops;
1298         struct nfsd4_deviceid_map *map;
1299         struct svc_export *exp;
1300         __be32 nfserr;
1301
1302         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1303                __func__,
1304                gdp->gd_layout_type,
1305                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1306                gdp->gd_maxcount);
1307
1308         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1309         if (!map) {
1310                 dprintk("%s: couldn't find device ID to export mapping!\n",
1311                         __func__);
1312                 return nfserr_noent;
1313         }
1314
1315         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1316         if (IS_ERR(exp)) {
1317                 dprintk("%s: could not find device id\n", __func__);
1318                 return nfserr_noent;
1319         }
1320
1321         nfserr = nfserr_layoutunavailable;
1322         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1323         if (!ops)
1324                 goto out;
1325
1326         nfserr = nfs_ok;
1327         if (gdp->gd_maxcount != 0) {
1328                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1329                                 rqstp, cstate->session->se_client, gdp);
1330         }
1331
1332         gdp->gd_notify_types &= ops->notify_types;
1333 out:
1334         exp_put(exp);
1335         return nfserr;
1336 }
1337
1338 static __be32
1339 nfsd4_layoutget(struct svc_rqst *rqstp,
1340                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1341 {
1342         struct nfsd4_layoutget *lgp = &u->layoutget;
1343         struct svc_fh *current_fh = &cstate->current_fh;
1344         const struct nfsd4_layout_ops *ops;
1345         struct nfs4_layout_stateid *ls;
1346         __be32 nfserr;
1347         int accmode;
1348
1349         switch (lgp->lg_seg.iomode) {
1350         case IOMODE_READ:
1351                 accmode = NFSD_MAY_READ;
1352                 break;
1353         case IOMODE_RW:
1354                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1355                 break;
1356         default:
1357                 dprintk("%s: invalid iomode %d\n",
1358                         __func__, lgp->lg_seg.iomode);
1359                 nfserr = nfserr_badiomode;
1360                 goto out;
1361         }
1362
1363         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1364         if (nfserr)
1365                 goto out;
1366
1367         nfserr = nfserr_layoutunavailable;
1368         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1369         if (!ops)
1370                 goto out;
1371
1372         /*
1373          * Verify minlength and range as per RFC5661:
1374          *  o  If loga_length is less than loga_minlength,
1375          *     the metadata server MUST return NFS4ERR_INVAL.
1376          *  o  If the sum of loga_offset and loga_minlength exceeds
1377          *     NFS4_UINT64_MAX, and loga_minlength is not
1378          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1379          *  o  If the sum of loga_offset and loga_length exceeds
1380          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1381          *     the error NFS4ERR_INVAL MUST result.
1382          */
1383         nfserr = nfserr_inval;
1384         if (lgp->lg_seg.length < lgp->lg_minlength ||
1385             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1386              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1387             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1388              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1389                 goto out;
1390         if (lgp->lg_seg.length == 0)
1391                 goto out;
1392
1393         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1394                                                 true, lgp->lg_layout_type, &ls);
1395         if (nfserr) {
1396                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1397                 goto out;
1398         }
1399
1400         nfserr = nfserr_recallconflict;
1401         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1402                 goto out_put_stid;
1403
1404         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1405                                      current_fh, lgp);
1406         if (nfserr)
1407                 goto out_put_stid;
1408
1409         nfserr = nfsd4_insert_layout(lgp, ls);
1410
1411 out_put_stid:
1412         mutex_unlock(&ls->ls_mutex);
1413         nfs4_put_stid(&ls->ls_stid);
1414 out:
1415         return nfserr;
1416 }
1417
1418 static __be32
1419 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1420                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1421 {
1422         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1423         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1424         struct svc_fh *current_fh = &cstate->current_fh;
1425         const struct nfsd4_layout_ops *ops;
1426         loff_t new_size = lcp->lc_last_wr + 1;
1427         struct inode *inode;
1428         struct nfs4_layout_stateid *ls;
1429         __be32 nfserr;
1430
1431         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1432         if (nfserr)
1433                 goto out;
1434
1435         nfserr = nfserr_layoutunavailable;
1436         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1437         if (!ops)
1438                 goto out;
1439         inode = d_inode(current_fh->fh_dentry);
1440
1441         nfserr = nfserr_inval;
1442         if (new_size <= seg->offset) {
1443                 dprintk("pnfsd: last write before layout segment\n");
1444                 goto out;
1445         }
1446         if (new_size > seg->offset + seg->length) {
1447                 dprintk("pnfsd: last write beyond layout segment\n");
1448                 goto out;
1449         }
1450         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1451                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1452                 goto out;
1453         }
1454
1455         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1456                                                 false, lcp->lc_layout_type,
1457                                                 &ls);
1458         if (nfserr) {
1459                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1460                 /* fixup error code as per RFC5661 */
1461                 if (nfserr == nfserr_bad_stateid)
1462                         nfserr = nfserr_badlayout;
1463                 goto out;
1464         }
1465
1466         /* LAYOUTCOMMIT does not require any serialization */
1467         mutex_unlock(&ls->ls_mutex);
1468
1469         if (new_size > i_size_read(inode)) {
1470                 lcp->lc_size_chg = 1;
1471                 lcp->lc_newsize = new_size;
1472         } else {
1473                 lcp->lc_size_chg = 0;
1474         }
1475
1476         nfserr = ops->proc_layoutcommit(inode, lcp);
1477         nfs4_put_stid(&ls->ls_stid);
1478 out:
1479         return nfserr;
1480 }
1481
1482 static __be32
1483 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1484                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1485 {
1486         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1487         struct svc_fh *current_fh = &cstate->current_fh;
1488         __be32 nfserr;
1489
1490         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1491         if (nfserr)
1492                 goto out;
1493
1494         nfserr = nfserr_layoutunavailable;
1495         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1496                 goto out;
1497
1498         switch (lrp->lr_seg.iomode) {
1499         case IOMODE_READ:
1500         case IOMODE_RW:
1501         case IOMODE_ANY:
1502                 break;
1503         default:
1504                 dprintk("%s: invalid iomode %d\n", __func__,
1505                         lrp->lr_seg.iomode);
1506                 nfserr = nfserr_inval;
1507                 goto out;
1508         }
1509
1510         switch (lrp->lr_return_type) {
1511         case RETURN_FILE:
1512                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1513                 break;
1514         case RETURN_FSID:
1515         case RETURN_ALL:
1516                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1517                 break;
1518         default:
1519                 dprintk("%s: invalid return_type %d\n", __func__,
1520                         lrp->lr_return_type);
1521                 nfserr = nfserr_inval;
1522                 break;
1523         }
1524 out:
1525         return nfserr;
1526 }
1527 #endif /* CONFIG_NFSD_PNFS */
1528
1529 /*
1530  * NULL call.
1531  */
1532 static __be32
1533 nfsd4_proc_null(struct svc_rqst *rqstp)
1534 {
1535         return nfs_ok;
1536 }
1537
1538 static inline void nfsd4_increment_op_stats(u32 opnum)
1539 {
1540         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1541                 nfsdstats.nfs4_opcount[opnum]++;
1542 }
1543
1544 enum nfsd4_op_flags {
1545         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1546         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1547         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1548         /* For rfc 5661 section 2.6.3.1.1: */
1549         OP_HANDLES_WRONGSEC = 1 << 3,
1550         OP_IS_PUTFH_LIKE = 1 << 4,
1551         /*
1552          * These are the ops whose result size we estimate before
1553          * encoding, to avoid performing an op then not being able to
1554          * respond or cache a response.  This includes writes and setattrs
1555          * as well as the operations usually called "nonidempotent":
1556          */
1557         OP_MODIFIES_SOMETHING = 1 << 5,
1558         /*
1559          * Cache compounds containing these ops in the xid-based drc:
1560          * We use the DRC for compounds containing non-idempotent
1561          * operations, *except* those that are 4.1-specific (since
1562          * sessions provide their own EOS), and except for stateful
1563          * operations other than setclientid and setclientid_confirm
1564          * (since sequence numbers provide EOS for open, lock, etc in
1565          * the v4.0 case).
1566          */
1567         OP_CACHEME = 1 << 6,
1568         /*
1569          * These are ops which clear current state id.
1570          */
1571         OP_CLEAR_STATEID = 1 << 7,
1572 };
1573
1574 struct nfsd4_operation {
1575         __be32 (*op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1576                         union nfsd4_op_u *);
1577         u32 op_flags;
1578         char *op_name;
1579         /* Try to get response size before operation */
1580         u32 (*op_rsize_bop)(struct svc_rqst *, struct nfsd4_op *);
1581         void (*op_get_currentstateid)(struct nfsd4_compound_state *,
1582                         union nfsd4_op_u *);
1583         void (*op_set_currentstateid)(struct nfsd4_compound_state *,
1584                         union nfsd4_op_u *);
1585 };
1586
1587 static const struct nfsd4_operation nfsd4_ops[];
1588
1589 static const char *nfsd4_op_name(unsigned opnum);
1590
1591 /*
1592  * Enforce NFSv4.1 COMPOUND ordering rules:
1593  *
1594  * Also note, enforced elsewhere:
1595  *      - SEQUENCE other than as first op results in
1596  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1597  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1598  *        (Enforced in nfsd4_bind_conn_to_session().)
1599  *      - DESTROY_SESSION must be the final operation in a compound, if
1600  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1601  *        (Enforced in nfsd4_destroy_session().)
1602  */
1603 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1604 {
1605         struct nfsd4_op *op = &args->ops[0];
1606
1607         /* These ordering requirements don't apply to NFSv4.0: */
1608         if (args->minorversion == 0)
1609                 return nfs_ok;
1610         /* This is weird, but OK, not our problem: */
1611         if (args->opcnt == 0)
1612                 return nfs_ok;
1613         if (op->status == nfserr_op_illegal)
1614                 return nfs_ok;
1615         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1616                 return nfserr_op_not_in_session;
1617         if (op->opnum == OP_SEQUENCE)
1618                 return nfs_ok;
1619         if (args->opcnt != 1)
1620                 return nfserr_not_only_op;
1621         return nfs_ok;
1622 }
1623
1624 static inline const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1625 {
1626         return &nfsd4_ops[op->opnum];
1627 }
1628
1629 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1630 {
1631         if (op->opnum == OP_ILLEGAL)
1632                 return false;
1633         return OPDESC(op)->op_flags & OP_CACHEME;
1634 }
1635
1636 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1637 {
1638         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1639         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1640         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1641         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1642         const struct nfsd4_operation *thisd = OPDESC(this);
1643         const struct nfsd4_operation *nextd;
1644
1645         /*
1646          * Most ops check wronsec on our own; only the putfh-like ops
1647          * have special rules.
1648          */
1649         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1650                 return false;
1651         /*
1652          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1653          * put-filehandle operation if we're not going to use the
1654          * result:
1655          */
1656         if (argp->opcnt == resp->opcnt)
1657                 return false;
1658         if (next->opnum == OP_ILLEGAL)
1659                 return false;
1660         nextd = OPDESC(next);
1661         /*
1662          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1663          * errors themselves as necessary; others should check for them
1664          * now:
1665          */
1666         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1667 }
1668
1669 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1670                                struct nfsd4_compoundres *resp)
1671 {
1672         struct xdr_stream *xdr = &resp->xdr;
1673         struct xdr_buf *buf = &rqstp->rq_res;
1674         struct kvec *head = buf->head;
1675
1676         xdr->buf = buf;
1677         xdr->iov = head;
1678         xdr->p   = head->iov_base + head->iov_len;
1679         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1680         /* Tail and page_len should be zero at this point: */
1681         buf->len = buf->head[0].iov_len;
1682         xdr->scratch.iov_len = 0;
1683         xdr->page_ptr = buf->pages - 1;
1684         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1685                 - rqstp->rq_auth_slack;
1686 }
1687
1688 /*
1689  * COMPOUND call.
1690  */
1691 static __be32
1692 nfsd4_proc_compound(struct svc_rqst *rqstp)
1693 {
1694         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1695         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1696         struct nfsd4_op *op;
1697         const struct nfsd4_operation *opdesc;
1698         struct nfsd4_compound_state *cstate = &resp->cstate;
1699         struct svc_fh *current_fh = &cstate->current_fh;
1700         struct svc_fh *save_fh = &cstate->save_fh;
1701         __be32          status;
1702
1703         svcxdr_init_encode(rqstp, resp);
1704         resp->tagp = resp->xdr.p;
1705         /* reserve space for: taglen, tag, and opcnt */
1706         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1707         resp->taglen = args->taglen;
1708         resp->tag = args->tag;
1709         resp->rqstp = rqstp;
1710         cstate->minorversion = args->minorversion;
1711         fh_init(current_fh, NFS4_FHSIZE);
1712         fh_init(save_fh, NFS4_FHSIZE);
1713         /*
1714          * Don't use the deferral mechanism for NFSv4; compounds make it
1715          * too hard to avoid non-idempotency problems.
1716          */
1717         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1718
1719         /*
1720          * According to RFC3010, this takes precedence over all other errors.
1721          */
1722         status = nfserr_minor_vers_mismatch;
1723         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1724                 goto out;
1725
1726         status = nfs41_check_op_ordering(args);
1727         if (status) {
1728                 op = &args->ops[0];
1729                 op->status = status;
1730                 goto encode_op;
1731         }
1732
1733         while (!status && resp->opcnt < args->opcnt) {
1734                 op = &args->ops[resp->opcnt++];
1735
1736                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1737                         resp->opcnt, args->opcnt, op->opnum,
1738                         nfsd4_op_name(op->opnum));
1739                 /*
1740                  * The XDR decode routines may have pre-set op->status;
1741                  * for example, if there is a miscellaneous XDR error
1742                  * it will be set to nfserr_bad_xdr.
1743                  */
1744                 if (op->status) {
1745                         if (op->opnum == OP_OPEN)
1746                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1747                         goto encode_op;
1748                 }
1749
1750                 opdesc = OPDESC(op);
1751
1752                 if (!current_fh->fh_dentry) {
1753                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1754                                 op->status = nfserr_nofilehandle;
1755                                 goto encode_op;
1756                         }
1757                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1758                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1759                         op->status = nfserr_moved;
1760                         goto encode_op;
1761                 }
1762
1763                 fh_clear_wcc(current_fh);
1764
1765                 /* If op is non-idempotent */
1766                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1767                         /*
1768                          * Don't execute this op if we couldn't encode a
1769                          * succesful reply:
1770                          */
1771                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1772                         /*
1773                          * Plus if there's another operation, make sure
1774                          * we'll have space to at least encode an error:
1775                          */
1776                         if (resp->opcnt < args->opcnt)
1777                                 plen += COMPOUND_ERR_SLACK_SPACE;
1778                         op->status = nfsd4_check_resp_size(resp, plen);
1779                 }
1780
1781                 if (op->status)
1782                         goto encode_op;
1783
1784                 if (opdesc->op_get_currentstateid)
1785                         opdesc->op_get_currentstateid(cstate, &op->u);
1786                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1787
1788                 /* Only from SEQUENCE */
1789                 if (cstate->status == nfserr_replay_cache) {
1790                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1791                         status = op->status;
1792                         goto out;
1793                 }
1794                 if (!op->status) {
1795                         if (opdesc->op_set_currentstateid)
1796                                 opdesc->op_set_currentstateid(cstate, &op->u);
1797
1798                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1799                                 clear_current_stateid(cstate);
1800
1801                         if (need_wrongsec_check(rqstp))
1802                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1803                 }
1804 encode_op:
1805                 if (op->status == nfserr_replay_me) {
1806                         op->replay = &cstate->replay_owner->so_replay;
1807                         nfsd4_encode_replay(&resp->xdr, op);
1808                         status = op->status = op->replay->rp_status;
1809                 } else {
1810                         nfsd4_encode_operation(resp, op);
1811                         status = op->status;
1812                 }
1813
1814                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1815                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1816                         be32_to_cpu(status));
1817
1818                 nfsd4_cstate_clear_replay(cstate);
1819                 nfsd4_increment_op_stats(op->opnum);
1820         }
1821
1822         cstate->status = status;
1823         fh_put(current_fh);
1824         fh_put(save_fh);
1825         BUG_ON(cstate->replay_owner);
1826 out:
1827         /* Reset deferral mechanism for RPC deferrals */
1828         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1829         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1830         return status;
1831 }
1832
1833 #define op_encode_hdr_size              (2)
1834 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1835 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1836 #define op_encode_change_info_maxsz     (5)
1837 #define nfs4_fattr_bitmap_maxsz         (4)
1838
1839 /* We'll fall back on returning no lockowner if run out of space: */
1840 #define op_encode_lockowner_maxsz       (0)
1841 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1842
1843 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1844
1845 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1846 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1847                                          op_encode_ace_maxsz)
1848
1849 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1850
1851 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1852 {
1853         return (op_encode_hdr_size) * sizeof(__be32);
1854 }
1855
1856 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1857 {
1858         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1859 }
1860
1861 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1862 {
1863         /* ac_supported, ac_resp_access */
1864         return (op_encode_hdr_size + 2)* sizeof(__be32);
1865 }
1866
1867 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1868 {
1869         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1870 }
1871
1872 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1873 {
1874         return (op_encode_hdr_size + op_encode_change_info_maxsz
1875                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1876 }
1877
1878 /*
1879  * Note since this is an idempotent operation we won't insist on failing
1880  * the op prematurely if the estimate is too large.  We may turn off splice
1881  * reads unnecessarily.
1882  */
1883 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1884                                       struct nfsd4_op *op)
1885 {
1886         u32 *bmap = op->u.getattr.ga_bmval;
1887         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1888         u32 ret = 0;
1889
1890         if (bmap0 & FATTR4_WORD0_ACL)
1891                 return svc_max_payload(rqstp);
1892         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1893                 return svc_max_payload(rqstp);
1894
1895         if (bmap1 & FATTR4_WORD1_OWNER) {
1896                 ret += IDMAP_NAMESZ + 4;
1897                 bmap1 &= ~FATTR4_WORD1_OWNER;
1898         }
1899         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1900                 ret += IDMAP_NAMESZ + 4;
1901                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1902         }
1903         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1904                 ret += NFS4_FHSIZE + 4;
1905                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1906         }
1907         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1908                 ret += NFS4_MAXLABELLEN + 12;
1909                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1910         }
1911         /*
1912          * Largest of remaining attributes are 16 bytes (e.g.,
1913          * supported_attributes)
1914          */
1915         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1916         /* bitmask, length */
1917         ret += 20;
1918         return ret;
1919 }
1920
1921 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1922 {
1923         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1924 }
1925
1926 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1927 {
1928         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1929                 * sizeof(__be32);
1930 }
1931
1932 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1933 {
1934         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1935                 * sizeof(__be32);
1936 }
1937
1938 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1939 {
1940         return (op_encode_hdr_size + op_encode_stateid_maxsz
1941                 + op_encode_change_info_maxsz + 1
1942                 + nfs4_fattr_bitmap_maxsz
1943                 + op_encode_delegation_maxsz) * sizeof(__be32);
1944 }
1945
1946 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1947 {
1948         u32 maxcount = 0, rlen = 0;
1949
1950         maxcount = svc_max_payload(rqstp);
1951         rlen = min(op->u.read.rd_length, maxcount);
1952
1953         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1954 }
1955
1956 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1957 {
1958         u32 maxcount = 0, rlen = 0;
1959
1960         maxcount = svc_max_payload(rqstp);
1961         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1962
1963         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1964                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1965 }
1966
1967 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1968 {
1969         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1970 }
1971
1972 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1973 {
1974         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1975                 * sizeof(__be32);
1976 }
1977
1978 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1979 {
1980         return (op_encode_hdr_size + op_encode_change_info_maxsz
1981                 + op_encode_change_info_maxsz) * sizeof(__be32);
1982 }
1983
1984 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1985                                        struct nfsd4_op *op)
1986 {
1987         return (op_encode_hdr_size
1988                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1989 }
1990
1991 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1992 {
1993         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1994                 * sizeof(__be32);
1995 }
1996
1997 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1998 {
1999         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2000 }
2001
2002 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2003 {
2004         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2005                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2006 }
2007
2008 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2009 {
2010         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2011                                                                 sizeof(__be32);
2012 }
2013
2014 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2015 {
2016         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2017 }
2018
2019 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2020 {
2021         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2022                 1 + 1 + /* eir_flags, spr_how */\
2023                 4 + /* spo_must_enforce & _allow with bitmap */\
2024                 2 + /*eir_server_owner.so_minor_id */\
2025                 /* eir_server_owner.so_major_id<> */\
2026                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2027                 /* eir_server_scope<> */\
2028                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2029                 1 + /* eir_server_impl_id array length */\
2030                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2031 }
2032
2033 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2034 {
2035         return (op_encode_hdr_size + \
2036                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2037                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2038 }
2039
2040 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2041 {
2042         return (op_encode_hdr_size + \
2043                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2044                 2 + /* csr_sequence, csr_flags */\
2045                 op_encode_channel_attrs_maxsz + \
2046                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2047 }
2048
2049 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2050 {
2051         return (op_encode_hdr_size +
2052                 1 /* wr_callback */ +
2053                 op_encode_stateid_maxsz /* wr_callback */ +
2054                 2 /* wr_count */ +
2055                 1 /* wr_committed */ +
2056                 op_encode_verifier_maxsz +
2057                 1 /* cr_consecutive */ +
2058                 1 /* cr_synchronous */) * sizeof(__be32);
2059 }
2060
2061 #ifdef CONFIG_NFSD_PNFS
2062 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2063 {
2064         u32 maxcount = 0, rlen = 0;
2065
2066         maxcount = svc_max_payload(rqstp);
2067         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2068
2069         return (op_encode_hdr_size +
2070                 1 /* gd_layout_type*/ +
2071                 XDR_QUADLEN(rlen) +
2072                 2 /* gd_notify_types */) * sizeof(__be32);
2073 }
2074
2075 /*
2076  * At this stage we don't really know what layout driver will handle the request,
2077  * so we need to define an arbitrary upper bound here.
2078  */
2079 #define MAX_LAYOUT_SIZE         128
2080 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2081 {
2082         return (op_encode_hdr_size +
2083                 1 /* logr_return_on_close */ +
2084                 op_encode_stateid_maxsz +
2085                 1 /* nr of layouts */ +
2086                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2087 }
2088
2089 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2090 {
2091         return (op_encode_hdr_size +
2092                 1 /* locr_newsize */ +
2093                 2 /* ns_size */) * sizeof(__be32);
2094 }
2095
2096 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2097 {
2098         return (op_encode_hdr_size +
2099                 1 /* lrs_stateid */ +
2100                 op_encode_stateid_maxsz) * sizeof(__be32);
2101 }
2102 #endif /* CONFIG_NFSD_PNFS */
2103
2104
2105 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2106 {
2107         return (op_encode_hdr_size + 3) * sizeof(__be32);
2108 }
2109
2110 static const struct nfsd4_operation nfsd4_ops[] = {
2111         [OP_ACCESS] = {
2112                 .op_func = nfsd4_access,
2113                 .op_name = "OP_ACCESS",
2114                 .op_rsize_bop = nfsd4_access_rsize,
2115         },
2116         [OP_CLOSE] = {
2117                 .op_func = nfsd4_close,
2118                 .op_flags = OP_MODIFIES_SOMETHING,
2119                 .op_name = "OP_CLOSE",
2120                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2121                 .op_get_currentstateid = nfsd4_get_closestateid,
2122                 .op_set_currentstateid = nfsd4_set_closestateid,
2123         },
2124         [OP_COMMIT] = {
2125                 .op_func = nfsd4_commit,
2126                 .op_flags = OP_MODIFIES_SOMETHING,
2127                 .op_name = "OP_COMMIT",
2128                 .op_rsize_bop = nfsd4_commit_rsize,
2129         },
2130         [OP_CREATE] = {
2131                 .op_func = nfsd4_create,
2132                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2133                 .op_name = "OP_CREATE",
2134                 .op_rsize_bop = nfsd4_create_rsize,
2135         },
2136         [OP_DELEGRETURN] = {
2137                 .op_func = nfsd4_delegreturn,
2138                 .op_flags = OP_MODIFIES_SOMETHING,
2139                 .op_name = "OP_DELEGRETURN",
2140                 .op_rsize_bop = nfsd4_only_status_rsize,
2141                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2142         },
2143         [OP_GETATTR] = {
2144                 .op_func = nfsd4_getattr,
2145                 .op_flags = ALLOWED_ON_ABSENT_FS,
2146                 .op_rsize_bop = nfsd4_getattr_rsize,
2147                 .op_name = "OP_GETATTR",
2148         },
2149         [OP_GETFH] = {
2150                 .op_func = nfsd4_getfh,
2151                 .op_name = "OP_GETFH",
2152                 .op_rsize_bop = nfsd4_getfh_rsize,
2153         },
2154         [OP_LINK] = {
2155                 .op_func = nfsd4_link,
2156                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2157                                 | OP_CACHEME,
2158                 .op_name = "OP_LINK",
2159                 .op_rsize_bop = nfsd4_link_rsize,
2160         },
2161         [OP_LOCK] = {
2162                 .op_func = nfsd4_lock,
2163                 .op_flags = OP_MODIFIES_SOMETHING,
2164                 .op_name = "OP_LOCK",
2165                 .op_rsize_bop = nfsd4_lock_rsize,
2166                 .op_set_currentstateid = nfsd4_set_lockstateid,
2167         },
2168         [OP_LOCKT] = {
2169                 .op_func = nfsd4_lockt,
2170                 .op_name = "OP_LOCKT",
2171                 .op_rsize_bop = nfsd4_lock_rsize,
2172         },
2173         [OP_LOCKU] = {
2174                 .op_func = nfsd4_locku,
2175                 .op_flags = OP_MODIFIES_SOMETHING,
2176                 .op_name = "OP_LOCKU",
2177                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2178                 .op_get_currentstateid = nfsd4_get_lockustateid,
2179         },
2180         [OP_LOOKUP] = {
2181                 .op_func = nfsd4_lookup,
2182                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2183                 .op_name = "OP_LOOKUP",
2184                 .op_rsize_bop = nfsd4_only_status_rsize,
2185         },
2186         [OP_LOOKUPP] = {
2187                 .op_func = nfsd4_lookupp,
2188                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2189                 .op_name = "OP_LOOKUPP",
2190                 .op_rsize_bop = nfsd4_only_status_rsize,
2191         },
2192         [OP_NVERIFY] = {
2193                 .op_func = nfsd4_nverify,
2194                 .op_name = "OP_NVERIFY",
2195                 .op_rsize_bop = nfsd4_only_status_rsize,
2196         },
2197         [OP_OPEN] = {
2198                 .op_func = nfsd4_open,
2199                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2200                 .op_name = "OP_OPEN",
2201                 .op_rsize_bop = nfsd4_open_rsize,
2202                 .op_set_currentstateid = nfsd4_set_openstateid,
2203         },
2204         [OP_OPEN_CONFIRM] = {
2205                 .op_func = nfsd4_open_confirm,
2206                 .op_flags = OP_MODIFIES_SOMETHING,
2207                 .op_name = "OP_OPEN_CONFIRM",
2208                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2209         },
2210         [OP_OPEN_DOWNGRADE] = {
2211                 .op_func = nfsd4_open_downgrade,
2212                 .op_flags = OP_MODIFIES_SOMETHING,
2213                 .op_name = "OP_OPEN_DOWNGRADE",
2214                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2215                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2216                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2217         },
2218         [OP_PUTFH] = {
2219                 .op_func = nfsd4_putfh,
2220                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2221                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2222                 .op_name = "OP_PUTFH",
2223                 .op_rsize_bop = nfsd4_only_status_rsize,
2224         },
2225         [OP_PUTPUBFH] = {
2226                 .op_func = nfsd4_putrootfh,
2227                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2228                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2229                 .op_name = "OP_PUTPUBFH",
2230                 .op_rsize_bop = nfsd4_only_status_rsize,
2231         },
2232         [OP_PUTROOTFH] = {
2233                 .op_func = nfsd4_putrootfh,
2234                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2235                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2236                 .op_name = "OP_PUTROOTFH",
2237                 .op_rsize_bop = nfsd4_only_status_rsize,
2238         },
2239         [OP_READ] = {
2240                 .op_func = nfsd4_read,
2241                 .op_name = "OP_READ",
2242                 .op_rsize_bop = nfsd4_read_rsize,
2243                 .op_get_currentstateid = nfsd4_get_readstateid,
2244         },
2245         [OP_READDIR] = {
2246                 .op_func = nfsd4_readdir,
2247                 .op_name = "OP_READDIR",
2248                 .op_rsize_bop = nfsd4_readdir_rsize,
2249         },
2250         [OP_READLINK] = {
2251                 .op_func = nfsd4_readlink,
2252                 .op_name = "OP_READLINK",
2253                 .op_rsize_bop = nfsd4_readlink_rsize,
2254         },
2255         [OP_REMOVE] = {
2256                 .op_func = nfsd4_remove,
2257                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2258                 .op_name = "OP_REMOVE",
2259                 .op_rsize_bop = nfsd4_remove_rsize,
2260         },
2261         [OP_RENAME] = {
2262                 .op_func = nfsd4_rename,
2263                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2264                 .op_name = "OP_RENAME",
2265                 .op_rsize_bop = nfsd4_rename_rsize,
2266         },
2267         [OP_RENEW] = {
2268                 .op_func = nfsd4_renew,
2269                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2270                                 | OP_MODIFIES_SOMETHING,
2271                 .op_name = "OP_RENEW",
2272                 .op_rsize_bop = nfsd4_only_status_rsize,
2273
2274         },
2275         [OP_RESTOREFH] = {
2276                 .op_func = nfsd4_restorefh,
2277                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2278                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2279                 .op_name = "OP_RESTOREFH",
2280                 .op_rsize_bop = nfsd4_only_status_rsize,
2281         },
2282         [OP_SAVEFH] = {
2283                 .op_func = nfsd4_savefh,
2284                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2285                 .op_name = "OP_SAVEFH",
2286                 .op_rsize_bop = nfsd4_only_status_rsize,
2287         },
2288         [OP_SECINFO] = {
2289                 .op_func = nfsd4_secinfo,
2290                 .op_flags = OP_HANDLES_WRONGSEC,
2291                 .op_name = "OP_SECINFO",
2292                 .op_rsize_bop = nfsd4_secinfo_rsize,
2293         },
2294         [OP_SETATTR] = {
2295                 .op_func = nfsd4_setattr,
2296                 .op_name = "OP_SETATTR",
2297                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2298                 .op_rsize_bop = nfsd4_setattr_rsize,
2299                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2300         },
2301         [OP_SETCLIENTID] = {
2302                 .op_func = nfsd4_setclientid,
2303                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2304                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2305                 .op_name = "OP_SETCLIENTID",
2306                 .op_rsize_bop = nfsd4_setclientid_rsize,
2307         },
2308         [OP_SETCLIENTID_CONFIRM] = {
2309                 .op_func = nfsd4_setclientid_confirm,
2310                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2311                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2312                 .op_name = "OP_SETCLIENTID_CONFIRM",
2313                 .op_rsize_bop = nfsd4_only_status_rsize,
2314         },
2315         [OP_VERIFY] = {
2316                 .op_func = nfsd4_verify,
2317                 .op_name = "OP_VERIFY",
2318                 .op_rsize_bop = nfsd4_only_status_rsize,
2319         },
2320         [OP_WRITE] = {
2321                 .op_func = nfsd4_write,
2322                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2323                 .op_name = "OP_WRITE",
2324                 .op_rsize_bop = nfsd4_write_rsize,
2325                 .op_get_currentstateid = nfsd4_get_writestateid,
2326         },
2327         [OP_RELEASE_LOCKOWNER] = {
2328                 .op_func = nfsd4_release_lockowner,
2329                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2330                                 | OP_MODIFIES_SOMETHING,
2331                 .op_name = "OP_RELEASE_LOCKOWNER",
2332                 .op_rsize_bop = nfsd4_only_status_rsize,
2333         },
2334
2335         /* NFSv4.1 operations */
2336         [OP_EXCHANGE_ID] = {
2337                 .op_func = nfsd4_exchange_id,
2338                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2339                                 | OP_MODIFIES_SOMETHING,
2340                 .op_name = "OP_EXCHANGE_ID",
2341                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2342         },
2343         [OP_BACKCHANNEL_CTL] = {
2344                 .op_func = nfsd4_backchannel_ctl,
2345                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2346                 .op_name = "OP_BACKCHANNEL_CTL",
2347                 .op_rsize_bop = nfsd4_only_status_rsize,
2348         },
2349         [OP_BIND_CONN_TO_SESSION] = {
2350                 .op_func = nfsd4_bind_conn_to_session,
2351                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2352                                 | OP_MODIFIES_SOMETHING,
2353                 .op_name = "OP_BIND_CONN_TO_SESSION",
2354                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2355         },
2356         [OP_CREATE_SESSION] = {
2357                 .op_func = nfsd4_create_session,
2358                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2359                                 | OP_MODIFIES_SOMETHING,
2360                 .op_name = "OP_CREATE_SESSION",
2361                 .op_rsize_bop = nfsd4_create_session_rsize,
2362         },
2363         [OP_DESTROY_SESSION] = {
2364                 .op_func = nfsd4_destroy_session,
2365                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2366                                 | OP_MODIFIES_SOMETHING,
2367                 .op_name = "OP_DESTROY_SESSION",
2368                 .op_rsize_bop = nfsd4_only_status_rsize,
2369         },
2370         [OP_SEQUENCE] = {
2371                 .op_func = nfsd4_sequence,
2372                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2373                 .op_name = "OP_SEQUENCE",
2374                 .op_rsize_bop = nfsd4_sequence_rsize,
2375         },
2376         [OP_DESTROY_CLIENTID] = {
2377                 .op_func = nfsd4_destroy_clientid,
2378                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2379                                 | OP_MODIFIES_SOMETHING,
2380                 .op_name = "OP_DESTROY_CLIENTID",
2381                 .op_rsize_bop = nfsd4_only_status_rsize,
2382         },
2383         [OP_RECLAIM_COMPLETE] = {
2384                 .op_func = nfsd4_reclaim_complete,
2385                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2386                 .op_name = "OP_RECLAIM_COMPLETE",
2387                 .op_rsize_bop = nfsd4_only_status_rsize,
2388         },
2389         [OP_SECINFO_NO_NAME] = {
2390                 .op_func = nfsd4_secinfo_no_name,
2391                 .op_flags = OP_HANDLES_WRONGSEC,
2392                 .op_name = "OP_SECINFO_NO_NAME",
2393                 .op_rsize_bop = nfsd4_secinfo_rsize,
2394         },
2395         [OP_TEST_STATEID] = {
2396                 .op_func = nfsd4_test_stateid,
2397                 .op_flags = ALLOWED_WITHOUT_FH,
2398                 .op_name = "OP_TEST_STATEID",
2399                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2400         },
2401         [OP_FREE_STATEID] = {
2402                 .op_func = nfsd4_free_stateid,
2403                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2404                 .op_name = "OP_FREE_STATEID",
2405                 .op_get_currentstateid = nfsd4_get_freestateid,
2406                 .op_rsize_bop = nfsd4_only_status_rsize,
2407         },
2408 #ifdef CONFIG_NFSD_PNFS
2409         [OP_GETDEVICEINFO] = {
2410                 .op_func = nfsd4_getdeviceinfo,
2411                 .op_flags = ALLOWED_WITHOUT_FH,
2412                 .op_name = "OP_GETDEVICEINFO",
2413                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2414         },
2415         [OP_LAYOUTGET] = {
2416                 .op_func = nfsd4_layoutget,
2417                 .op_flags = OP_MODIFIES_SOMETHING,
2418                 .op_name = "OP_LAYOUTGET",
2419                 .op_rsize_bop = nfsd4_layoutget_rsize,
2420         },
2421         [OP_LAYOUTCOMMIT] = {
2422                 .op_func = nfsd4_layoutcommit,
2423                 .op_flags = OP_MODIFIES_SOMETHING,
2424                 .op_name = "OP_LAYOUTCOMMIT",
2425                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2426         },
2427         [OP_LAYOUTRETURN] = {
2428                 .op_func = nfsd4_layoutreturn,
2429                 .op_flags = OP_MODIFIES_SOMETHING,
2430                 .op_name = "OP_LAYOUTRETURN",
2431                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2432         },
2433 #endif /* CONFIG_NFSD_PNFS */
2434
2435         /* NFSv4.2 operations */
2436         [OP_ALLOCATE] = {
2437                 .op_func = nfsd4_allocate,
2438                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2439                 .op_name = "OP_ALLOCATE",
2440                 .op_rsize_bop = nfsd4_only_status_rsize,
2441         },
2442         [OP_DEALLOCATE] = {
2443                 .op_func = nfsd4_deallocate,
2444                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2445                 .op_name = "OP_DEALLOCATE",
2446                 .op_rsize_bop = nfsd4_only_status_rsize,
2447         },
2448         [OP_CLONE] = {
2449                 .op_func = nfsd4_clone,
2450                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2451                 .op_name = "OP_CLONE",
2452                 .op_rsize_bop = nfsd4_only_status_rsize,
2453         },
2454         [OP_COPY] = {
2455                 .op_func = nfsd4_copy,
2456                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2457                 .op_name = "OP_COPY",
2458                 .op_rsize_bop = nfsd4_copy_rsize,
2459         },
2460         [OP_SEEK] = {
2461                 .op_func = nfsd4_seek,
2462                 .op_name = "OP_SEEK",
2463                 .op_rsize_bop = nfsd4_seek_rsize,
2464         },
2465 };
2466
2467 /**
2468  * nfsd4_spo_must_allow - Determine if the compound op contains an
2469  * operation that is allowed to be sent with machine credentials
2470  *
2471  * @rqstp: a pointer to the struct svc_rqst
2472  *
2473  * Checks to see if the compound contains a spo_must_allow op
2474  * and confirms that it was sent with the proper machine creds.
2475  */
2476
2477 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2478 {
2479         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2480         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2481         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2482         struct nfsd4_compound_state *cstate = &resp->cstate;
2483         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2484         u32 opiter;
2485
2486         if (!cstate->minorversion)
2487                 return false;
2488
2489         if (cstate->spo_must_allowed == true)
2490                 return true;
2491
2492         opiter = resp->opcnt;
2493         while (opiter < argp->opcnt) {
2494                 this = &argp->ops[opiter++];
2495                 if (test_bit(this->opnum, allow->u.longs) &&
2496                         cstate->clp->cl_mach_cred &&
2497                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2498                         cstate->spo_must_allowed = true;
2499                         return true;
2500                 }
2501         }
2502         cstate->spo_must_allowed = false;
2503         return false;
2504 }
2505
2506 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2507 {
2508         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2509                 return op_encode_hdr_size * sizeof(__be32);
2510
2511         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2512         return OPDESC(op)->op_rsize_bop(rqstp, op);
2513 }
2514
2515 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2516 {
2517         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2518                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2519                         op->opnum, nfsd4_op_name(op->opnum));
2520                 WARN_ON_ONCE(1);
2521         }
2522 }
2523
2524 static const char *nfsd4_op_name(unsigned opnum)
2525 {
2526         if (opnum < ARRAY_SIZE(nfsd4_ops))
2527                 return nfsd4_ops[opnum].op_name;
2528         return "unknown_operation";
2529 }
2530
2531 #define nfsd4_voidres                   nfsd4_voidargs
2532 struct nfsd4_voidargs { int dummy; };
2533
2534 static const struct svc_procedure nfsd_procedures4[2] = {
2535         [NFSPROC4_NULL] = {
2536                 .pc_func = nfsd4_proc_null,
2537                 .pc_encode = nfs4svc_encode_voidres,
2538                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2539                 .pc_ressize = sizeof(struct nfsd4_voidres),
2540                 .pc_cachetype = RC_NOCACHE,
2541                 .pc_xdrressize = 1,
2542         },
2543         [NFSPROC4_COMPOUND] = {
2544                 .pc_func = nfsd4_proc_compound,
2545                 .pc_decode = nfs4svc_decode_compoundargs,
2546                 .pc_encode = nfs4svc_encode_compoundres,
2547                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2548                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2549                 .pc_release = nfsd4_release_compoundargs,
2550                 .pc_cachetype = RC_NOCACHE,
2551                 .pc_xdrressize = NFSD_BUFSIZE/4,
2552         },
2553 };
2554
2555 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2556 const struct svc_version nfsd_version4 = {
2557         .vs_vers                = 4,
2558         .vs_nproc               = 2,
2559         .vs_proc                = nfsd_procedures4,
2560         .vs_count               = nfsd_count3,
2561         .vs_dispatch            = nfsd_dispatch,
2562         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2563         .vs_rpcb_optnl          = true,
2564         .vs_need_cong_ctrl      = true,
2565 };
2566
2567 /*
2568  * Local variables:
2569  *  c-basic-offset: 8
2570  * End:
2571  */