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
 788 static void
 789 nfsd4_read_release(union nfsd4_op_u *u)
 790 {
 791         if (u->read.rd_filp)
 792                 fput(u->read.rd_filp);
 793 }
 794
 795 static __be32
 796 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 797               union nfsd4_op_u *u)
 798 {
 799         struct nfsd4_readdir *readdir = &u->readdir;
 800         u64 cookie = readdir->rd_cookie;
 801         static const nfs4_verifier zeroverf;
 802
 803         /* no need to check permission - this will be done in nfsd_readdir() */
 804
 805         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 806                 return nfserr_inval;
 807
 808         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 809         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 810         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 811
 812         if ((cookie == 1) || (cookie == 2) ||
 813             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 814                 return nfserr_bad_cookie;
 815
 816         readdir->rd_rqstp = rqstp;
 817         readdir->rd_fhp = &cstate->current_fh;
 818         return nfs_ok;
 819 }
 820
 821 static __be32
 822 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 823                union nfsd4_op_u *u)
 824 {
 825         u->readlink.rl_rqstp = rqstp;
 826         u->readlink.rl_fhp = &cstate->current_fh;
 827         return nfs_ok;
 828 }
 829
 830 static __be32
 831 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 832              union nfsd4_op_u *u)
 833 {
 834         struct nfsd4_remove *remove = &u->remove;
 835         __be32 status;
 836
 837         if (opens_in_grace(SVC_NET(rqstp)))
 838                 return nfserr_grace;
 839         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 840                              remove->rm_name, remove->rm_namelen);
 841         if (!status) {
 842                 fh_unlock(&cstate->current_fh);
 843                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 844         }
 845         return status;
 846 }
 847
 848 static __be32
 849 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 850              union nfsd4_op_u *u)
 851 {
 852         struct nfsd4_rename *rename = &u->rename;
 853         __be32 status = nfserr_nofilehandle;
 854
 855         if (!cstate->save_fh.fh_dentry)
 856                 return status;
 857         if (opens_in_grace(SVC_NET(rqstp)) &&
 858                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 859                 return nfserr_grace;
 860         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 861                              rename->rn_snamelen, &cstate->current_fh,
 862                              rename->rn_tname, rename->rn_tnamelen);
 863         if (status)
 864                 return status;
 865         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 866         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 867         return nfs_ok;
 868 }
 869
 870 static __be32
 871 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 872               union nfsd4_op_u *u)
 873 {
 874         struct nfsd4_secinfo *secinfo = &u->secinfo;
 875         struct svc_export *exp;
 876         struct dentry *dentry;
 877         __be32 err;
 878
 879         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 880         if (err)
 881                 return err;
 882         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 883                                     secinfo->si_name, secinfo->si_namelen,
 884                                     &exp, &dentry);
 885         if (err)
 886                 return err;
 887         fh_unlock(&cstate->current_fh);
 888         if (d_really_is_negative(dentry)) {
 889                 exp_put(exp);
 890                 err = nfserr_noent;
 891         } else
 892                 secinfo->si_exp = exp;
 893         dput(dentry);
 894         if (cstate->minorversion)
 895                 /* See rfc 5661 section 2.6.3.1.1.8 */
 896                 fh_put(&cstate->current_fh);
 897         return err;
 898 }
 899
 900 static __be32
 901 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 902                 union nfsd4_op_u *u)
 903 {
 904         __be32 err;
 905
 906         switch (u->secinfo_no_name.sin_style) {
 907         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 908                 break;
 909         case NFS4_SECINFO_STYLE4_PARENT:
 910                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 911                 if (err)
 912                         return err;
 913                 break;
 914         default:
 915                 return nfserr_inval;
 916         }
 917
 918         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 919         fh_put(&cstate->current_fh);
 920         return nfs_ok;
 921 }
 922
 923 static void
 924 nfsd4_secinfo_release(union nfsd4_op_u *u)
 925 {
 926         if (u->secinfo.si_exp)
 927                 exp_put(u->secinfo.si_exp);
 928 }
 929
 930 static void
 931 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
 932 {
 933         if (u->secinfo_no_name.sin_exp)
 934                 exp_put(u->secinfo_no_name.sin_exp);
 935 }
 936
 937 static __be32
 938 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 939               union nfsd4_op_u *u)
 940 {
 941         struct nfsd4_setattr *setattr = &u->setattr;
 942         __be32 status = nfs_ok;
 943         int err;
 944
 945         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 946                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 947                                 &cstate->current_fh, &setattr->sa_stateid,
 948                                 WR_STATE, NULL, NULL);
 949                 if (status) {
 950                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 951                         return status;
 952                 }
 953         }
 954         err = fh_want_write(&cstate->current_fh);
 955         if (err)
 956                 return nfserrno(err);
 957         status = nfs_ok;
 958
 959         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 960                                     nfsd_attrmask);
 961         if (status)
 962                 goto out;
 963
 964         if (setattr->sa_acl != NULL)
 965                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 966                                             setattr->sa_acl);
 967         if (status)
 968                 goto out;
 969         if (setattr->sa_label.len)
 970                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 971                                 &setattr->sa_label);
 972         if (status)
 973                 goto out;
 974         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 975                                 0, (time_t)0);
 976 out:
 977         fh_drop_write(&cstate->current_fh);
 978         return status;
 979 }
 980
 981 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 982 {
 983         int i = 1;
 984         int buflen = write->wr_buflen;
 985
 986         vec[0].iov_base = write->wr_head.iov_base;
 987         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 988         buflen -= vec[0].iov_len;
 989
 990         while (buflen) {
 991                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 992                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 993                 buflen -= vec[i].iov_len;
 994                 i++;
 995         }
 996         return i;
 997 }
 998
 999 static __be32
1000 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1001             union nfsd4_op_u *u)
1002 {
1003         struct nfsd4_write *write = &u->write;
1004         stateid_t *stateid = &write->wr_stateid;
1005         struct file *filp = NULL;
1006         __be32 status = nfs_ok;
1007         unsigned long cnt;
1008         int nvecs;
1009
1010         if (write->wr_offset >= OFFSET_MAX)
1011                 return nfserr_inval;
1012
1013         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1014                                                 stateid, WR_STATE, &filp, NULL);
1015         if (status) {
1016                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1017                 return status;
1018         }
1019
1020         cnt = write->wr_buflen;
1021         write->wr_how_written = write->wr_stable_how;
1022         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1023
1024         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1025         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1026
1027         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1028                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1029                                 write->wr_how_written);
1030         fput(filp);
1031
1032         write->wr_bytes_written = cnt;
1033
1034         return status;
1035 }
1036
1037 static __be32
1038 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1039                   stateid_t *src_stateid, struct file **src,
1040                   stateid_t *dst_stateid, struct file **dst)
1041 {
1042         __be32 status;
1043
1044         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1045                                             src_stateid, RD_STATE, src, NULL);
1046         if (status) {
1047                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1048                 goto out;
1049         }
1050
1051         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1052                                             dst_stateid, WR_STATE, dst, NULL);
1053         if (status) {
1054                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1055                 goto out_put_src;
1056         }
1057
1058         /* fix up for NFS-specific error code */
1059         if (!S_ISREG(file_inode(*src)->i_mode) ||
1060             !S_ISREG(file_inode(*dst)->i_mode)) {
1061                 status = nfserr_wrong_type;
1062                 goto out_put_dst;
1063         }
1064
1065 out:
1066         return status;
1067 out_put_dst:
1068         fput(*dst);
1069 out_put_src:
1070         fput(*src);
1071         goto out;
1072 }
1073
1074 static __be32
1075 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1076                 union nfsd4_op_u *u)
1077 {
1078         struct nfsd4_clone *clone = &u->clone;
1079         struct file *src, *dst;
1080         __be32 status;
1081
1082         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1083                                    &clone->cl_dst_stateid, &dst);
1084         if (status)
1085                 goto out;
1086
1087         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1088                         dst, clone->cl_dst_pos, clone->cl_count);
1089
1090         fput(dst);
1091         fput(src);
1092 out:
1093         return status;
1094 }
1095
1096 static __be32
1097 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1098                 union nfsd4_op_u *u)
1099 {
1100         struct nfsd4_copy *copy = &u->copy;
1101         struct file *src, *dst;
1102         __be32 status;
1103         ssize_t bytes;
1104
1105         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1106                                    &copy->cp_dst_stateid, &dst);
1107         if (status)
1108                 goto out;
1109
1110         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1111                         dst, copy->cp_dst_pos, copy->cp_count);
1112
1113         if (bytes < 0)
1114                 status = nfserrno(bytes);
1115         else {
1116                 copy->cp_res.wr_bytes_written = bytes;
1117                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1118                 copy->cp_consecutive = 1;
1119                 copy->cp_synchronous = 1;
1120                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1121                 status = nfs_ok;
1122         }
1123
1124         fput(src);
1125         fput(dst);
1126 out:
1127         return status;
1128 }
1129
1130 static __be32
1131 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1132                 struct nfsd4_fallocate *fallocate, int flags)
1133 {
1134         __be32 status = nfserr_notsupp;
1135         struct file *file;
1136
1137         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1138                                             &fallocate->falloc_stateid,
1139                                             WR_STATE, &file, NULL);
1140         if (status != nfs_ok) {
1141                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1142                 return status;
1143         }
1144
1145         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1146                                      fallocate->falloc_offset,
1147                                      fallocate->falloc_length,
1148                                      flags);
1149         fput(file);
1150         return status;
1151 }
1152
1153 static __be32
1154 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1155                union nfsd4_op_u *u)
1156 {
1157         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1158 }
1159
1160 static __be32
1161 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1162                  union nfsd4_op_u *u)
1163 {
1164         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1165                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1166 }
1167
1168 static __be32
1169 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1170            union nfsd4_op_u *u)
1171 {
1172         struct nfsd4_seek *seek = &u->seek;
1173         int whence;
1174         __be32 status;
1175         struct file *file;
1176
1177         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1178                                             &seek->seek_stateid,
1179                                             RD_STATE, &file, NULL);
1180         if (status) {
1181                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1182                 return status;
1183         }
1184
1185         switch (seek->seek_whence) {
1186         case NFS4_CONTENT_DATA:
1187                 whence = SEEK_DATA;
1188                 break;
1189         case NFS4_CONTENT_HOLE:
1190                 whence = SEEK_HOLE;
1191                 break;
1192         default:
1193                 status = nfserr_union_notsupp;
1194                 goto out;
1195         }
1196
1197         /*
1198          * Note:  This call does change file->f_pos, but nothing in NFSD
1199          *        should ever file->f_pos.
1200          */
1201         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1202         if (seek->seek_pos < 0)
1203                 status = nfserrno(seek->seek_pos);
1204         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1205                 seek->seek_eof = true;
1206
1207 out:
1208         fput(file);
1209         return status;
1210 }
1211
1212 /* This routine never returns NFS_OK!  If there are no other errors, it
1213  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1214  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1215  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1216  */
1217 static __be32
1218 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1219              struct nfsd4_verify *verify)
1220 {
1221         __be32 *buf, *p;
1222         int count;
1223         __be32 status;
1224
1225         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1226         if (status)
1227                 return status;
1228
1229         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1230         if (status)
1231                 return status;
1232
1233         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1234             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1235                 return nfserr_inval;
1236         if (verify->ve_attrlen & 3)
1237                 return nfserr_inval;
1238
1239         /* count in words:
1240          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1241          */
1242         count = 4 + (verify->ve_attrlen >> 2);
1243         buf = kmalloc(count << 2, GFP_KERNEL);
1244         if (!buf)
1245                 return nfserr_jukebox;
1246
1247         p = buf;
1248         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1249                                     cstate->current_fh.fh_export,
1250                                     cstate->current_fh.fh_dentry,
1251                                     verify->ve_bmval,
1252                                     rqstp, 0);
1253         /*
1254          * If nfsd4_encode_fattr() ran out of space, assume that's because
1255          * the attributes are longer (hence different) than those given:
1256          */
1257         if (status == nfserr_resource)
1258                 status = nfserr_not_same;
1259         if (status)
1260                 goto out_kfree;
1261
1262         /* skip bitmap */
1263         p = buf + 1 + ntohl(buf[0]);
1264         status = nfserr_not_same;
1265         if (ntohl(*p++) != verify->ve_attrlen)
1266                 goto out_kfree;
1267         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1268                 status = nfserr_same;
1269
1270 out_kfree:
1271         kfree(buf);
1272         return status;
1273 }
1274
1275 static __be32
1276 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1277               union nfsd4_op_u *u)
1278 {
1279         __be32 status;
1280
1281         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1282         return status == nfserr_not_same ? nfs_ok : status;
1283 }
1284
1285 static __be32
1286 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1287              union nfsd4_op_u *u)
1288 {
1289         __be32 status;
1290
1291         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1292         return status == nfserr_same ? nfs_ok : status;
1293 }
1294
1295 #ifdef CONFIG_NFSD_PNFS
1296 static const struct nfsd4_layout_ops *
1297 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1298 {
1299         if (!exp->ex_layout_types) {
1300                 dprintk("%s: export does not support pNFS\n", __func__);
1301                 return NULL;
1302         }
1303
1304         if (layout_type >= LAYOUT_TYPE_MAX ||
1305             !(exp->ex_layout_types & (1 << layout_type))) {
1306                 dprintk("%s: layout type %d not supported\n",
1307                         __func__, layout_type);
1308                 return NULL;
1309         }
1310
1311         return nfsd4_layout_ops[layout_type];
1312 }
1313
1314 static __be32
1315 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1316                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1317 {
1318         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1319         const struct nfsd4_layout_ops *ops;
1320         struct nfsd4_deviceid_map *map;
1321         struct svc_export *exp;
1322         __be32 nfserr;
1323
1324         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1325                __func__,
1326                gdp->gd_layout_type,
1327                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1328                gdp->gd_maxcount);
1329
1330         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1331         if (!map) {
1332                 dprintk("%s: couldn't find device ID to export mapping!\n",
1333                         __func__);
1334                 return nfserr_noent;
1335         }
1336
1337         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1338         if (IS_ERR(exp)) {
1339                 dprintk("%s: could not find device id\n", __func__);
1340                 return nfserr_noent;
1341         }
1342
1343         nfserr = nfserr_layoutunavailable;
1344         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1345         if (!ops)
1346                 goto out;
1347
1348         nfserr = nfs_ok;
1349         if (gdp->gd_maxcount != 0) {
1350                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1351                                 rqstp, cstate->session->se_client, gdp);
1352         }
1353
1354         gdp->gd_notify_types &= ops->notify_types;
1355 out:
1356         exp_put(exp);
1357         return nfserr;
1358 }
1359
1360 static void
1361 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1362 {
1363         kfree(u->getdeviceinfo.gd_device);
1364 }
1365
1366 static __be32
1367 nfsd4_layoutget(struct svc_rqst *rqstp,
1368                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1369 {
1370         struct nfsd4_layoutget *lgp = &u->layoutget;
1371         struct svc_fh *current_fh = &cstate->current_fh;
1372         const struct nfsd4_layout_ops *ops;
1373         struct nfs4_layout_stateid *ls;
1374         __be32 nfserr;
1375         int accmode;
1376
1377         switch (lgp->lg_seg.iomode) {
1378         case IOMODE_READ:
1379                 accmode = NFSD_MAY_READ;
1380                 break;
1381         case IOMODE_RW:
1382                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1383                 break;
1384         default:
1385                 dprintk("%s: invalid iomode %d\n",
1386                         __func__, lgp->lg_seg.iomode);
1387                 nfserr = nfserr_badiomode;
1388                 goto out;
1389         }
1390
1391         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1392         if (nfserr)
1393                 goto out;
1394
1395         nfserr = nfserr_layoutunavailable;
1396         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1397         if (!ops)
1398                 goto out;
1399
1400         /*
1401          * Verify minlength and range as per RFC5661:
1402          *  o  If loga_length is less than loga_minlength,
1403          *     the metadata server MUST return NFS4ERR_INVAL.
1404          *  o  If the sum of loga_offset and loga_minlength exceeds
1405          *     NFS4_UINT64_MAX, and loga_minlength is not
1406          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1407          *  o  If the sum of loga_offset and loga_length exceeds
1408          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1409          *     the error NFS4ERR_INVAL MUST result.
1410          */
1411         nfserr = nfserr_inval;
1412         if (lgp->lg_seg.length < lgp->lg_minlength ||
1413             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1414              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1415             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1416              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1417                 goto out;
1418         if (lgp->lg_seg.length == 0)
1419                 goto out;
1420
1421         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1422                                                 true, lgp->lg_layout_type, &ls);
1423         if (nfserr) {
1424                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1425                 goto out;
1426         }
1427
1428         nfserr = nfserr_recallconflict;
1429         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1430                 goto out_put_stid;
1431
1432         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1433                                      current_fh, lgp);
1434         if (nfserr)
1435                 goto out_put_stid;
1436
1437         nfserr = nfsd4_insert_layout(lgp, ls);
1438
1439 out_put_stid:
1440         mutex_unlock(&ls->ls_mutex);
1441         nfs4_put_stid(&ls->ls_stid);
1442 out:
1443         return nfserr;
1444 }
1445
1446 static void
1447 nfsd4_layoutget_release(union nfsd4_op_u *u)
1448 {
1449         kfree(u->layoutget.lg_content);
1450 }
1451
1452 static __be32
1453 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1454                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1455 {
1456         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1457         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1458         struct svc_fh *current_fh = &cstate->current_fh;
1459         const struct nfsd4_layout_ops *ops;
1460         loff_t new_size = lcp->lc_last_wr + 1;
1461         struct inode *inode;
1462         struct nfs4_layout_stateid *ls;
1463         __be32 nfserr;
1464
1465         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1466         if (nfserr)
1467                 goto out;
1468
1469         nfserr = nfserr_layoutunavailable;
1470         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1471         if (!ops)
1472                 goto out;
1473         inode = d_inode(current_fh->fh_dentry);
1474
1475         nfserr = nfserr_inval;
1476         if (new_size <= seg->offset) {
1477                 dprintk("pnfsd: last write before layout segment\n");
1478                 goto out;
1479         }
1480         if (new_size > seg->offset + seg->length) {
1481                 dprintk("pnfsd: last write beyond layout segment\n");
1482                 goto out;
1483         }
1484         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1485                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1486                 goto out;
1487         }
1488
1489         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1490                                                 false, lcp->lc_layout_type,
1491                                                 &ls);
1492         if (nfserr) {
1493                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1494                 /* fixup error code as per RFC5661 */
1495                 if (nfserr == nfserr_bad_stateid)
1496                         nfserr = nfserr_badlayout;
1497                 goto out;
1498         }
1499
1500         /* LAYOUTCOMMIT does not require any serialization */
1501         mutex_unlock(&ls->ls_mutex);
1502
1503         if (new_size > i_size_read(inode)) {
1504                 lcp->lc_size_chg = 1;
1505                 lcp->lc_newsize = new_size;
1506         } else {
1507                 lcp->lc_size_chg = 0;
1508         }
1509
1510         nfserr = ops->proc_layoutcommit(inode, lcp);
1511         nfs4_put_stid(&ls->ls_stid);
1512 out:
1513         return nfserr;
1514 }
1515
1516 static __be32
1517 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1518                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1519 {
1520         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1521         struct svc_fh *current_fh = &cstate->current_fh;
1522         __be32 nfserr;
1523
1524         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1525         if (nfserr)
1526                 goto out;
1527
1528         nfserr = nfserr_layoutunavailable;
1529         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1530                 goto out;
1531
1532         switch (lrp->lr_seg.iomode) {
1533         case IOMODE_READ:
1534         case IOMODE_RW:
1535         case IOMODE_ANY:
1536                 break;
1537         default:
1538                 dprintk("%s: invalid iomode %d\n", __func__,
1539                         lrp->lr_seg.iomode);
1540                 nfserr = nfserr_inval;
1541                 goto out;
1542         }
1543
1544         switch (lrp->lr_return_type) {
1545         case RETURN_FILE:
1546                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1547                 break;
1548         case RETURN_FSID:
1549         case RETURN_ALL:
1550                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1551                 break;
1552         default:
1553                 dprintk("%s: invalid return_type %d\n", __func__,
1554                         lrp->lr_return_type);
1555                 nfserr = nfserr_inval;
1556                 break;
1557         }
1558 out:
1559         return nfserr;
1560 }
1561 #endif /* CONFIG_NFSD_PNFS */
1562
1563 /*
1564  * NULL call.
1565  */
1566 static __be32
1567 nfsd4_proc_null(struct svc_rqst *rqstp)
1568 {
1569         return nfs_ok;
1570 }
1571
1572 static inline void nfsd4_increment_op_stats(u32 opnum)
1573 {
1574         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1575                 nfsdstats.nfs4_opcount[opnum]++;
1576 }
1577
1578 static const struct nfsd4_operation nfsd4_ops[];
1579
1580 static const char *nfsd4_op_name(unsigned opnum);
1581
1582 /*
1583  * Enforce NFSv4.1 COMPOUND ordering rules:
1584  *
1585  * Also note, enforced elsewhere:
1586  *      - SEQUENCE other than as first op results in
1587  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1588  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1589  *        (Enforced in nfsd4_bind_conn_to_session().)
1590  *      - DESTROY_SESSION must be the final operation in a compound, if
1591  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1592  *        (Enforced in nfsd4_destroy_session().)
1593  */
1594 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1595 {
1596         struct nfsd4_op *op = &args->ops[0];
1597
1598         /* These ordering requirements don't apply to NFSv4.0: */
1599         if (args->minorversion == 0)
1600                 return nfs_ok;
1601         /* This is weird, but OK, not our problem: */
1602         if (args->opcnt == 0)
1603                 return nfs_ok;
1604         if (op->status == nfserr_op_illegal)
1605                 return nfs_ok;
1606         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1607                 return nfserr_op_not_in_session;
1608         if (op->opnum == OP_SEQUENCE)
1609                 return nfs_ok;
1610         if (args->opcnt != 1)
1611                 return nfserr_not_only_op;
1612         return nfs_ok;
1613 }
1614
1615 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1616 {
1617         return &nfsd4_ops[op->opnum];
1618 }
1619
1620 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1621 {
1622         if (op->opnum == OP_ILLEGAL)
1623                 return false;
1624         return OPDESC(op)->op_flags & OP_CACHEME;
1625 }
1626
1627 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1628 {
1629         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1630         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1631         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1632         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1633         const struct nfsd4_operation *thisd = OPDESC(this);
1634         const struct nfsd4_operation *nextd;
1635
1636         /*
1637          * Most ops check wronsec on our own; only the putfh-like ops
1638          * have special rules.
1639          */
1640         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1641                 return false;
1642         /*
1643          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1644          * put-filehandle operation if we're not going to use the
1645          * result:
1646          */
1647         if (argp->opcnt == resp->opcnt)
1648                 return false;
1649         if (next->opnum == OP_ILLEGAL)
1650                 return false;
1651         nextd = OPDESC(next);
1652         /*
1653          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1654          * errors themselves as necessary; others should check for them
1655          * now:
1656          */
1657         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1658 }
1659
1660 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1661                                struct nfsd4_compoundres *resp)
1662 {
1663         struct xdr_stream *xdr = &resp->xdr;
1664         struct xdr_buf *buf = &rqstp->rq_res;
1665         struct kvec *head = buf->head;
1666
1667         xdr->buf = buf;
1668         xdr->iov = head;
1669         xdr->p   = head->iov_base + head->iov_len;
1670         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1671         /* Tail and page_len should be zero at this point: */
1672         buf->len = buf->head[0].iov_len;
1673         xdr->scratch.iov_len = 0;
1674         xdr->page_ptr = buf->pages - 1;
1675         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1676                 - rqstp->rq_auth_slack;
1677 }
1678
1679 /*
1680  * COMPOUND call.
1681  */
1682 static __be32
1683 nfsd4_proc_compound(struct svc_rqst *rqstp)
1684 {
1685         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1686         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1687         struct nfsd4_op *op;
1688         struct nfsd4_compound_state *cstate = &resp->cstate;
1689         struct svc_fh *current_fh = &cstate->current_fh;
1690         struct svc_fh *save_fh = &cstate->save_fh;
1691         __be32          status;
1692
1693         svcxdr_init_encode(rqstp, resp);
1694         resp->tagp = resp->xdr.p;
1695         /* reserve space for: taglen, tag, and opcnt */
1696         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1697         resp->taglen = args->taglen;
1698         resp->tag = args->tag;
1699         resp->rqstp = rqstp;
1700         cstate->minorversion = args->minorversion;
1701         fh_init(current_fh, NFS4_FHSIZE);
1702         fh_init(save_fh, NFS4_FHSIZE);
1703         /*
1704          * Don't use the deferral mechanism for NFSv4; compounds make it
1705          * too hard to avoid non-idempotency problems.
1706          */
1707         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1708
1709         /*
1710          * According to RFC3010, this takes precedence over all other errors.
1711          */
1712         status = nfserr_minor_vers_mismatch;
1713         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1714                 goto out;
1715
1716         status = nfs41_check_op_ordering(args);
1717         if (status) {
1718                 op = &args->ops[0];
1719                 op->status = status;
1720                 goto encode_op;
1721         }
1722
1723         while (!status && resp->opcnt < args->opcnt) {
1724                 op = &args->ops[resp->opcnt++];
1725
1726                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1727                         resp->opcnt, args->opcnt, op->opnum,
1728                         nfsd4_op_name(op->opnum));
1729                 /*
1730                  * The XDR decode routines may have pre-set op->status;
1731                  * for example, if there is a miscellaneous XDR error
1732                  * it will be set to nfserr_bad_xdr.
1733                  */
1734                 if (op->status) {
1735                         if (op->opnum == OP_OPEN)
1736                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1737                         goto encode_op;
1738                 }
1739
1740                 if (!current_fh->fh_dentry) {
1741                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1742                                 op->status = nfserr_nofilehandle;
1743                                 goto encode_op;
1744                         }
1745                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1746                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1747                         op->status = nfserr_moved;
1748                         goto encode_op;
1749                 }
1750
1751                 fh_clear_wcc(current_fh);
1752
1753                 /* If op is non-idempotent */
1754                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1755                         /*
1756                          * Don't execute this op if we couldn't encode a
1757                          * succesful reply:
1758                          */
1759                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
1760                         /*
1761                          * Plus if there's another operation, make sure
1762                          * we'll have space to at least encode an error:
1763                          */
1764                         if (resp->opcnt < args->opcnt)
1765                                 plen += COMPOUND_ERR_SLACK_SPACE;
1766                         op->status = nfsd4_check_resp_size(resp, plen);
1767                 }
1768
1769                 if (op->status)
1770                         goto encode_op;
1771
1772                 if (op->opdesc->op_get_currentstateid)
1773                         op->opdesc->op_get_currentstateid(cstate, &op->u);
1774                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
1775
1776                 /* Only from SEQUENCE */
1777                 if (cstate->status == nfserr_replay_cache) {
1778                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1779                         status = op->status;
1780                         goto out;
1781                 }
1782                 if (!op->status) {
1783                         if (op->opdesc->op_set_currentstateid)
1784                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
1785
1786                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
1787                                 clear_current_stateid(cstate);
1788
1789                         if (need_wrongsec_check(rqstp))
1790                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1791                 }
1792 encode_op:
1793                 if (op->status == nfserr_replay_me) {
1794                         op->replay = &cstate->replay_owner->so_replay;
1795                         nfsd4_encode_replay(&resp->xdr, op);
1796                         status = op->status = op->replay->rp_status;
1797                 } else {
1798                         nfsd4_encode_operation(resp, op);
1799                         status = op->status;
1800                 }
1801
1802                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1803                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1804                         be32_to_cpu(status));
1805
1806                 nfsd4_cstate_clear_replay(cstate);
1807                 nfsd4_increment_op_stats(op->opnum);
1808         }
1809
1810         cstate->status = status;
1811         fh_put(current_fh);
1812         fh_put(save_fh);
1813         BUG_ON(cstate->replay_owner);
1814 out:
1815         /* Reset deferral mechanism for RPC deferrals */
1816         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1817         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1818         return status;
1819 }
1820
1821 #define op_encode_hdr_size              (2)
1822 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1823 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1824 #define op_encode_change_info_maxsz     (5)
1825 #define nfs4_fattr_bitmap_maxsz         (4)
1826
1827 /* We'll fall back on returning no lockowner if run out of space: */
1828 #define op_encode_lockowner_maxsz       (0)
1829 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1830
1831 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1832
1833 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1834 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1835                                          op_encode_ace_maxsz)
1836
1837 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1838
1839 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1840 {
1841         return (op_encode_hdr_size) * sizeof(__be32);
1842 }
1843
1844 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1845 {
1846         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1847 }
1848
1849 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1850 {
1851         /* ac_supported, ac_resp_access */
1852         return (op_encode_hdr_size + 2)* sizeof(__be32);
1853 }
1854
1855 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1856 {
1857         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1858 }
1859
1860 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1861 {
1862         return (op_encode_hdr_size + op_encode_change_info_maxsz
1863                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1864 }
1865
1866 /*
1867  * Note since this is an idempotent operation we won't insist on failing
1868  * the op prematurely if the estimate is too large.  We may turn off splice
1869  * reads unnecessarily.
1870  */
1871 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1872                                       struct nfsd4_op *op)
1873 {
1874         u32 *bmap = op->u.getattr.ga_bmval;
1875         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1876         u32 ret = 0;
1877
1878         if (bmap0 & FATTR4_WORD0_ACL)
1879                 return svc_max_payload(rqstp);
1880         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1881                 return svc_max_payload(rqstp);
1882
1883         if (bmap1 & FATTR4_WORD1_OWNER) {
1884                 ret += IDMAP_NAMESZ + 4;
1885                 bmap1 &= ~FATTR4_WORD1_OWNER;
1886         }
1887         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1888                 ret += IDMAP_NAMESZ + 4;
1889                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1890         }
1891         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1892                 ret += NFS4_FHSIZE + 4;
1893                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1894         }
1895         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1896                 ret += NFS4_MAXLABELLEN + 12;
1897                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1898         }
1899         /*
1900          * Largest of remaining attributes are 16 bytes (e.g.,
1901          * supported_attributes)
1902          */
1903         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1904         /* bitmask, length */
1905         ret += 20;
1906         return ret;
1907 }
1908
1909 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1910 {
1911         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1912 }
1913
1914 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1915 {
1916         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1917                 * sizeof(__be32);
1918 }
1919
1920 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1921 {
1922         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1923                 * sizeof(__be32);
1924 }
1925
1926 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1927 {
1928         return (op_encode_hdr_size + op_encode_stateid_maxsz
1929                 + op_encode_change_info_maxsz + 1
1930                 + nfs4_fattr_bitmap_maxsz
1931                 + op_encode_delegation_maxsz) * sizeof(__be32);
1932 }
1933
1934 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1935 {
1936         u32 maxcount = 0, rlen = 0;
1937
1938         maxcount = svc_max_payload(rqstp);
1939         rlen = min(op->u.read.rd_length, maxcount);
1940
1941         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1942 }
1943
1944 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1945 {
1946         u32 maxcount = 0, rlen = 0;
1947
1948         maxcount = svc_max_payload(rqstp);
1949         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1950
1951         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1952                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1953 }
1954
1955 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1956 {
1957         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1958 }
1959
1960 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1961 {
1962         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1963                 * sizeof(__be32);
1964 }
1965
1966 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1967 {
1968         return (op_encode_hdr_size + op_encode_change_info_maxsz
1969                 + op_encode_change_info_maxsz) * sizeof(__be32);
1970 }
1971
1972 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1973                                        struct nfsd4_op *op)
1974 {
1975         return (op_encode_hdr_size
1976                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1977 }
1978
1979 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1980 {
1981         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1982                 * sizeof(__be32);
1983 }
1984
1985 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1986 {
1987         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1988 }
1989
1990 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1991 {
1992         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
1993                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
1994 }
1995
1996 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1997 {
1998         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1999                                                                 sizeof(__be32);
2000 }
2001
2002 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2003 {
2004         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2005 }
2006
2007 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2008 {
2009         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2010                 1 + 1 + /* eir_flags, spr_how */\
2011                 4 + /* spo_must_enforce & _allow with bitmap */\
2012                 2 + /*eir_server_owner.so_minor_id */\
2013                 /* eir_server_owner.so_major_id<> */\
2014                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2015                 /* eir_server_scope<> */\
2016                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2017                 1 + /* eir_server_impl_id array length */\
2018                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2019 }
2020
2021 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2022 {
2023         return (op_encode_hdr_size + \
2024                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2025                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2026 }
2027
2028 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2029 {
2030         return (op_encode_hdr_size + \
2031                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2032                 2 + /* csr_sequence, csr_flags */\
2033                 op_encode_channel_attrs_maxsz + \
2034                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2035 }
2036
2037 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2038 {
2039         return (op_encode_hdr_size +
2040                 1 /* wr_callback */ +
2041                 op_encode_stateid_maxsz /* wr_callback */ +
2042                 2 /* wr_count */ +
2043                 1 /* wr_committed */ +
2044                 op_encode_verifier_maxsz +
2045                 1 /* cr_consecutive */ +
2046                 1 /* cr_synchronous */) * sizeof(__be32);
2047 }
2048
2049 #ifdef CONFIG_NFSD_PNFS
2050 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2051 {
2052         u32 maxcount = 0, rlen = 0;
2053
2054         maxcount = svc_max_payload(rqstp);
2055         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2056
2057         return (op_encode_hdr_size +
2058                 1 /* gd_layout_type*/ +
2059                 XDR_QUADLEN(rlen) +
2060                 2 /* gd_notify_types */) * sizeof(__be32);
2061 }
2062
2063 /*
2064  * At this stage we don't really know what layout driver will handle the request,
2065  * so we need to define an arbitrary upper bound here.
2066  */
2067 #define MAX_LAYOUT_SIZE         128
2068 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2069 {
2070         return (op_encode_hdr_size +
2071                 1 /* logr_return_on_close */ +
2072                 op_encode_stateid_maxsz +
2073                 1 /* nr of layouts */ +
2074                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2075 }
2076
2077 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2078 {
2079         return (op_encode_hdr_size +
2080                 1 /* locr_newsize */ +
2081                 2 /* ns_size */) * sizeof(__be32);
2082 }
2083
2084 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2085 {
2086         return (op_encode_hdr_size +
2087                 1 /* lrs_stateid */ +
2088                 op_encode_stateid_maxsz) * sizeof(__be32);
2089 }
2090 #endif /* CONFIG_NFSD_PNFS */
2091
2092
2093 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2094 {
2095         return (op_encode_hdr_size + 3) * sizeof(__be32);
2096 }
2097
2098 static const struct nfsd4_operation nfsd4_ops[] = {
2099         [OP_ACCESS] = {
2100                 .op_func = nfsd4_access,
2101                 .op_name = "OP_ACCESS",
2102                 .op_rsize_bop = nfsd4_access_rsize,
2103         },
2104         [OP_CLOSE] = {
2105                 .op_func = nfsd4_close,
2106                 .op_flags = OP_MODIFIES_SOMETHING,
2107                 .op_name = "OP_CLOSE",
2108                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2109                 .op_get_currentstateid = nfsd4_get_closestateid,
2110                 .op_set_currentstateid = nfsd4_set_closestateid,
2111         },
2112         [OP_COMMIT] = {
2113                 .op_func = nfsd4_commit,
2114                 .op_flags = OP_MODIFIES_SOMETHING,
2115                 .op_name = "OP_COMMIT",
2116                 .op_rsize_bop = nfsd4_commit_rsize,
2117         },
2118         [OP_CREATE] = {
2119                 .op_func = nfsd4_create,
2120                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2121                 .op_name = "OP_CREATE",
2122                 .op_rsize_bop = nfsd4_create_rsize,
2123         },
2124         [OP_DELEGRETURN] = {
2125                 .op_func = nfsd4_delegreturn,
2126                 .op_flags = OP_MODIFIES_SOMETHING,
2127                 .op_name = "OP_DELEGRETURN",
2128                 .op_rsize_bop = nfsd4_only_status_rsize,
2129                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2130         },
2131         [OP_GETATTR] = {
2132                 .op_func = nfsd4_getattr,
2133                 .op_flags = ALLOWED_ON_ABSENT_FS,
2134                 .op_rsize_bop = nfsd4_getattr_rsize,
2135                 .op_name = "OP_GETATTR",
2136         },
2137         [OP_GETFH] = {
2138                 .op_func = nfsd4_getfh,
2139                 .op_name = "OP_GETFH",
2140                 .op_rsize_bop = nfsd4_getfh_rsize,
2141         },
2142         [OP_LINK] = {
2143                 .op_func = nfsd4_link,
2144                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2145                                 | OP_CACHEME,
2146                 .op_name = "OP_LINK",
2147                 .op_rsize_bop = nfsd4_link_rsize,
2148         },
2149         [OP_LOCK] = {
2150                 .op_func = nfsd4_lock,
2151                 .op_flags = OP_MODIFIES_SOMETHING |
2152                                 OP_NONTRIVIAL_ERROR_ENCODE,
2153                 .op_name = "OP_LOCK",
2154                 .op_rsize_bop = nfsd4_lock_rsize,
2155                 .op_set_currentstateid = nfsd4_set_lockstateid,
2156         },
2157         [OP_LOCKT] = {
2158                 .op_func = nfsd4_lockt,
2159                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2160                 .op_name = "OP_LOCKT",
2161                 .op_rsize_bop = nfsd4_lock_rsize,
2162         },
2163         [OP_LOCKU] = {
2164                 .op_func = nfsd4_locku,
2165                 .op_flags = OP_MODIFIES_SOMETHING,
2166                 .op_name = "OP_LOCKU",
2167                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2168                 .op_get_currentstateid = nfsd4_get_lockustateid,
2169         },
2170         [OP_LOOKUP] = {
2171                 .op_func = nfsd4_lookup,
2172                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2173                 .op_name = "OP_LOOKUP",
2174                 .op_rsize_bop = nfsd4_only_status_rsize,
2175         },
2176         [OP_LOOKUPP] = {
2177                 .op_func = nfsd4_lookupp,
2178                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2179                 .op_name = "OP_LOOKUPP",
2180                 .op_rsize_bop = nfsd4_only_status_rsize,
2181         },
2182         [OP_NVERIFY] = {
2183                 .op_func = nfsd4_nverify,
2184                 .op_name = "OP_NVERIFY",
2185                 .op_rsize_bop = nfsd4_only_status_rsize,
2186         },
2187         [OP_OPEN] = {
2188                 .op_func = nfsd4_open,
2189                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2190                 .op_name = "OP_OPEN",
2191                 .op_rsize_bop = nfsd4_open_rsize,
2192                 .op_set_currentstateid = nfsd4_set_openstateid,
2193         },
2194         [OP_OPEN_CONFIRM] = {
2195                 .op_func = nfsd4_open_confirm,
2196                 .op_flags = OP_MODIFIES_SOMETHING,
2197                 .op_name = "OP_OPEN_CONFIRM",
2198                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2199         },
2200         [OP_OPEN_DOWNGRADE] = {
2201                 .op_func = nfsd4_open_downgrade,
2202                 .op_flags = OP_MODIFIES_SOMETHING,
2203                 .op_name = "OP_OPEN_DOWNGRADE",
2204                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2205                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2206                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2207         },
2208         [OP_PUTFH] = {
2209                 .op_func = nfsd4_putfh,
2210                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2211                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2212                 .op_name = "OP_PUTFH",
2213                 .op_rsize_bop = nfsd4_only_status_rsize,
2214         },
2215         [OP_PUTPUBFH] = {
2216                 .op_func = nfsd4_putrootfh,
2217                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2218                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2219                 .op_name = "OP_PUTPUBFH",
2220                 .op_rsize_bop = nfsd4_only_status_rsize,
2221         },
2222         [OP_PUTROOTFH] = {
2223                 .op_func = nfsd4_putrootfh,
2224                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2225                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2226                 .op_name = "OP_PUTROOTFH",
2227                 .op_rsize_bop = nfsd4_only_status_rsize,
2228         },
2229         [OP_READ] = {
2230                 .op_func = nfsd4_read,
2231                 .op_release = nfsd4_read_release,
2232                 .op_name = "OP_READ",
2233                 .op_rsize_bop = nfsd4_read_rsize,
2234                 .op_get_currentstateid = nfsd4_get_readstateid,
2235         },
2236         [OP_READDIR] = {
2237                 .op_func = nfsd4_readdir,
2238                 .op_name = "OP_READDIR",
2239                 .op_rsize_bop = nfsd4_readdir_rsize,
2240         },
2241         [OP_READLINK] = {
2242                 .op_func = nfsd4_readlink,
2243                 .op_name = "OP_READLINK",
2244                 .op_rsize_bop = nfsd4_readlink_rsize,
2245         },
2246         [OP_REMOVE] = {
2247                 .op_func = nfsd4_remove,
2248                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2249                 .op_name = "OP_REMOVE",
2250                 .op_rsize_bop = nfsd4_remove_rsize,
2251         },
2252         [OP_RENAME] = {
2253                 .op_func = nfsd4_rename,
2254                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2255                 .op_name = "OP_RENAME",
2256                 .op_rsize_bop = nfsd4_rename_rsize,
2257         },
2258         [OP_RENEW] = {
2259                 .op_func = nfsd4_renew,
2260                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2261                                 | OP_MODIFIES_SOMETHING,
2262                 .op_name = "OP_RENEW",
2263                 .op_rsize_bop = nfsd4_only_status_rsize,
2264
2265         },
2266         [OP_RESTOREFH] = {
2267                 .op_func = nfsd4_restorefh,
2268                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2269                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2270                 .op_name = "OP_RESTOREFH",
2271                 .op_rsize_bop = nfsd4_only_status_rsize,
2272         },
2273         [OP_SAVEFH] = {
2274                 .op_func = nfsd4_savefh,
2275                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2276                 .op_name = "OP_SAVEFH",
2277                 .op_rsize_bop = nfsd4_only_status_rsize,
2278         },
2279         [OP_SECINFO] = {
2280                 .op_func = nfsd4_secinfo,
2281                 .op_release = nfsd4_secinfo_release,
2282                 .op_flags = OP_HANDLES_WRONGSEC,
2283                 .op_name = "OP_SECINFO",
2284                 .op_rsize_bop = nfsd4_secinfo_rsize,
2285         },
2286         [OP_SETATTR] = {
2287                 .op_func = nfsd4_setattr,
2288                 .op_name = "OP_SETATTR",
2289                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2290                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2291                 .op_rsize_bop = nfsd4_setattr_rsize,
2292                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2293         },
2294         [OP_SETCLIENTID] = {
2295                 .op_func = nfsd4_setclientid,
2296                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2297                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2298                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2299                 .op_name = "OP_SETCLIENTID",
2300                 .op_rsize_bop = nfsd4_setclientid_rsize,
2301         },
2302         [OP_SETCLIENTID_CONFIRM] = {
2303                 .op_func = nfsd4_setclientid_confirm,
2304                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2305                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2306                 .op_name = "OP_SETCLIENTID_CONFIRM",
2307                 .op_rsize_bop = nfsd4_only_status_rsize,
2308         },
2309         [OP_VERIFY] = {
2310                 .op_func = nfsd4_verify,
2311                 .op_name = "OP_VERIFY",
2312                 .op_rsize_bop = nfsd4_only_status_rsize,
2313         },
2314         [OP_WRITE] = {
2315                 .op_func = nfsd4_write,
2316                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2317                 .op_name = "OP_WRITE",
2318                 .op_rsize_bop = nfsd4_write_rsize,
2319                 .op_get_currentstateid = nfsd4_get_writestateid,
2320         },
2321         [OP_RELEASE_LOCKOWNER] = {
2322                 .op_func = nfsd4_release_lockowner,
2323                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2324                                 | OP_MODIFIES_SOMETHING,
2325                 .op_name = "OP_RELEASE_LOCKOWNER",
2326                 .op_rsize_bop = nfsd4_only_status_rsize,
2327         },
2328
2329         /* NFSv4.1 operations */
2330         [OP_EXCHANGE_ID] = {
2331                 .op_func = nfsd4_exchange_id,
2332                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2333                                 | OP_MODIFIES_SOMETHING,
2334                 .op_name = "OP_EXCHANGE_ID",
2335                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2336         },
2337         [OP_BACKCHANNEL_CTL] = {
2338                 .op_func = nfsd4_backchannel_ctl,
2339                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2340                 .op_name = "OP_BACKCHANNEL_CTL",
2341                 .op_rsize_bop = nfsd4_only_status_rsize,
2342         },
2343         [OP_BIND_CONN_TO_SESSION] = {
2344                 .op_func = nfsd4_bind_conn_to_session,
2345                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2346                                 | OP_MODIFIES_SOMETHING,
2347                 .op_name = "OP_BIND_CONN_TO_SESSION",
2348                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2349         },
2350         [OP_CREATE_SESSION] = {
2351                 .op_func = nfsd4_create_session,
2352                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2353                                 | OP_MODIFIES_SOMETHING,
2354                 .op_name = "OP_CREATE_SESSION",
2355                 .op_rsize_bop = nfsd4_create_session_rsize,
2356         },
2357         [OP_DESTROY_SESSION] = {
2358                 .op_func = nfsd4_destroy_session,
2359                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2360                                 | OP_MODIFIES_SOMETHING,
2361                 .op_name = "OP_DESTROY_SESSION",
2362                 .op_rsize_bop = nfsd4_only_status_rsize,
2363         },
2364         [OP_SEQUENCE] = {
2365                 .op_func = nfsd4_sequence,
2366                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2367                 .op_name = "OP_SEQUENCE",
2368                 .op_rsize_bop = nfsd4_sequence_rsize,
2369         },
2370         [OP_DESTROY_CLIENTID] = {
2371                 .op_func = nfsd4_destroy_clientid,
2372                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2373                                 | OP_MODIFIES_SOMETHING,
2374                 .op_name = "OP_DESTROY_CLIENTID",
2375                 .op_rsize_bop = nfsd4_only_status_rsize,
2376         },
2377         [OP_RECLAIM_COMPLETE] = {
2378                 .op_func = nfsd4_reclaim_complete,
2379                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2380                 .op_name = "OP_RECLAIM_COMPLETE",
2381                 .op_rsize_bop = nfsd4_only_status_rsize,
2382         },
2383         [OP_SECINFO_NO_NAME] = {
2384                 .op_func = nfsd4_secinfo_no_name,
2385                 .op_release = nfsd4_secinfo_no_name_release,
2386                 .op_flags = OP_HANDLES_WRONGSEC,
2387                 .op_name = "OP_SECINFO_NO_NAME",
2388                 .op_rsize_bop = nfsd4_secinfo_rsize,
2389         },
2390         [OP_TEST_STATEID] = {
2391                 .op_func = nfsd4_test_stateid,
2392                 .op_flags = ALLOWED_WITHOUT_FH,
2393                 .op_name = "OP_TEST_STATEID",
2394                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2395         },
2396         [OP_FREE_STATEID] = {
2397                 .op_func = nfsd4_free_stateid,
2398                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2399                 .op_name = "OP_FREE_STATEID",
2400                 .op_get_currentstateid = nfsd4_get_freestateid,
2401                 .op_rsize_bop = nfsd4_only_status_rsize,
2402         },
2403 #ifdef CONFIG_NFSD_PNFS
2404         [OP_GETDEVICEINFO] = {
2405                 .op_func = nfsd4_getdeviceinfo,
2406                 .op_release = nfsd4_getdeviceinfo_release,
2407                 .op_flags = ALLOWED_WITHOUT_FH,
2408                 .op_name = "OP_GETDEVICEINFO",
2409                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2410         },
2411         [OP_LAYOUTGET] = {
2412                 .op_func = nfsd4_layoutget,
2413                 .op_release = nfsd4_layoutget_release,
2414                 .op_flags = OP_MODIFIES_SOMETHING,
2415                 .op_name = "OP_LAYOUTGET",
2416                 .op_rsize_bop = nfsd4_layoutget_rsize,
2417         },
2418         [OP_LAYOUTCOMMIT] = {
2419                 .op_func = nfsd4_layoutcommit,
2420                 .op_flags = OP_MODIFIES_SOMETHING,
2421                 .op_name = "OP_LAYOUTCOMMIT",
2422                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2423         },
2424         [OP_LAYOUTRETURN] = {
2425                 .op_func = nfsd4_layoutreturn,
2426                 .op_flags = OP_MODIFIES_SOMETHING,
2427                 .op_name = "OP_LAYOUTRETURN",
2428                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2429         },
2430 #endif /* CONFIG_NFSD_PNFS */
2431
2432         /* NFSv4.2 operations */
2433         [OP_ALLOCATE] = {
2434                 .op_func = nfsd4_allocate,
2435                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2436                 .op_name = "OP_ALLOCATE",
2437                 .op_rsize_bop = nfsd4_only_status_rsize,
2438         },
2439         [OP_DEALLOCATE] = {
2440                 .op_func = nfsd4_deallocate,
2441                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2442                 .op_name = "OP_DEALLOCATE",
2443                 .op_rsize_bop = nfsd4_only_status_rsize,
2444         },
2445         [OP_CLONE] = {
2446                 .op_func = nfsd4_clone,
2447                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2448                 .op_name = "OP_CLONE",
2449                 .op_rsize_bop = nfsd4_only_status_rsize,
2450         },
2451         [OP_COPY] = {
2452                 .op_func = nfsd4_copy,
2453                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2454                 .op_name = "OP_COPY",
2455                 .op_rsize_bop = nfsd4_copy_rsize,
2456         },
2457         [OP_SEEK] = {
2458                 .op_func = nfsd4_seek,
2459                 .op_name = "OP_SEEK",
2460                 .op_rsize_bop = nfsd4_seek_rsize,
2461         },
2462 };
2463
2464 /**
2465  * nfsd4_spo_must_allow - Determine if the compound op contains an
2466  * operation that is allowed to be sent with machine credentials
2467  *
2468  * @rqstp: a pointer to the struct svc_rqst
2469  *
2470  * Checks to see if the compound contains a spo_must_allow op
2471  * and confirms that it was sent with the proper machine creds.
2472  */
2473
2474 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2475 {
2476         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2477         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2478         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2479         struct nfsd4_compound_state *cstate = &resp->cstate;
2480         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2481         u32 opiter;
2482
2483         if (!cstate->minorversion)
2484                 return false;
2485
2486         if (cstate->spo_must_allowed == true)
2487                 return true;
2488
2489         opiter = resp->opcnt;
2490         while (opiter < argp->opcnt) {
2491                 this = &argp->ops[opiter++];
2492                 if (test_bit(this->opnum, allow->u.longs) &&
2493                         cstate->clp->cl_mach_cred &&
2494                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2495                         cstate->spo_must_allowed = true;
2496                         return true;
2497                 }
2498         }
2499         cstate->spo_must_allowed = false;
2500         return false;
2501 }
2502
2503 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2504 {
2505         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2506                 return op_encode_hdr_size * sizeof(__be32);
2507
2508         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2509         return OPDESC(op)->op_rsize_bop(rqstp, op);
2510 }
2511
2512 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2513 {
2514         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2515                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2516                         op->opnum, nfsd4_op_name(op->opnum));
2517                 WARN_ON_ONCE(1);
2518         }
2519 }
2520
2521 static const char *nfsd4_op_name(unsigned opnum)
2522 {
2523         if (opnum < ARRAY_SIZE(nfsd4_ops))
2524                 return nfsd4_ops[opnum].op_name;
2525         return "unknown_operation";
2526 }
2527
2528 #define nfsd4_voidres                   nfsd4_voidargs
2529 struct nfsd4_voidargs { int dummy; };
2530
2531 static const struct svc_procedure nfsd_procedures4[2] = {
2532         [NFSPROC4_NULL] = {
2533                 .pc_func = nfsd4_proc_null,
2534                 .pc_encode = nfs4svc_encode_voidres,
2535                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2536                 .pc_ressize = sizeof(struct nfsd4_voidres),
2537                 .pc_cachetype = RC_NOCACHE,
2538                 .pc_xdrressize = 1,
2539         },
2540         [NFSPROC4_COMPOUND] = {
2541                 .pc_func = nfsd4_proc_compound,
2542                 .pc_decode = nfs4svc_decode_compoundargs,
2543                 .pc_encode = nfs4svc_encode_compoundres,
2544                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2545                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2546                 .pc_release = nfsd4_release_compoundargs,
2547                 .pc_cachetype = RC_NOCACHE,
2548                 .pc_xdrressize = NFSD_BUFSIZE/4,
2549         },
2550 };
2551
2552 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2553 const struct svc_version nfsd_version4 = {
2554         .vs_vers                = 4,
2555         .vs_nproc               = 2,
2556         .vs_proc                = nfsd_procedures4,
2557         .vs_count               = nfsd_count3,
2558         .vs_dispatch            = nfsd_dispatch,
2559         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2560         .vs_rpcb_optnl          = true,
2561         .vs_need_cong_ctrl      = true,
2562 };
2563
2564 /*
2565  * Local variables:
2566  *  c-basic-offset: 8
2567  * End:
2568  */