fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/fs_struct.h>
  36 #include <linux/file.h>
  37 #include <linux/falloc.h>
  38 #include <linux/slab.h>
  39
  40 #include "idmap.h"
  41 #include "cache.h"
  42 #include "xdr4.h"
  43 #include "vfs.h"
  44 #include "current_stateid.h"
  45 #include "netns.h"
  46 #include "acl.h"
  47 #include "pnfs.h"
  48 #include "trace.h"
  49
  50 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  51 #include <linux/security.h>
  52
  53 static inline void
  54 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  55 {
  56         struct inode *inode = d_inode(resfh->fh_dentry);
  57         int status;
  58
  59         inode_lock(inode);
  60         status = security_inode_setsecctx(resfh->fh_dentry,
  61                 label->data, label->len);
  62         inode_unlock(inode);
  63
  64         if (status)
  65                 /*
  66                  * XXX: We should really fail the whole open, but we may
  67                  * already have created a new file, so it may be too
  68                  * late.  For now this seems the least of evils:
  69                  */
  70                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  71
  72         return;
  73 }
  74 #else
  75 static inline void
  76 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  77 { }
  78 #endif
  79
  80 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  81
  82 static u32 nfsd_attrmask[] = {
  83         NFSD_WRITEABLE_ATTRS_WORD0,
  84         NFSD_WRITEABLE_ATTRS_WORD1,
  85         NFSD_WRITEABLE_ATTRS_WORD2
  86 };
  87
  88 static u32 nfsd41_ex_attrmask[] = {
  89         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  90         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  91         NFSD_SUPPATTR_EXCLCREAT_WORD2
  92 };
  93
  94 static __be32
  95 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  96                    u32 *bmval, u32 *writable)
  97 {
  98         struct dentry *dentry = cstate->current_fh.fh_dentry;
  99         struct svc_export *exp = cstate->current_fh.fh_export;
 100
 101         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
 102                 return nfserr_attrnotsupp;
 103         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
 104                 return nfserr_attrnotsupp;
 105         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
 106                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
 107                 return nfserr_attrnotsupp;
 108         if (writable && !bmval_is_subset(bmval, writable))
 109                 return nfserr_inval;
 110         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
 111                         (bmval[1] & FATTR4_WORD1_MODE))
 112                 return nfserr_inval;
 113         return nfs_ok;
 114 }
 115
 116 static __be32
 117 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 118         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 119 {
 120         __be32 status = nfs_ok;
 121
 122         if (open->op_create == NFS4_OPEN_CREATE) {
 123                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 124                     || open->op_createmode == NFS4_CREATE_GUARDED)
 125                         status = check_attr_support(rqstp, cstate,
 126                                         open->op_bmval, nfsd_attrmask);
 127                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 128                         status = check_attr_support(rqstp, cstate,
 129                                         open->op_bmval, nfsd41_ex_attrmask);
 130         }
 131
 132         return status;
 133 }
 134
 135 static int
 136 is_create_with_attrs(struct nfsd4_open *open)
 137 {
 138         return open->op_create == NFS4_OPEN_CREATE
 139                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 140                     || open->op_createmode == NFS4_CREATE_GUARDED
 141                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 142 }
 143
 144 /*
 145  * if error occurs when setting the acl, just clear the acl bit
 146  * in the returned attr bitmap.
 147  */
 148 static void
 149 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 150                 struct nfs4_acl *acl, u32 *bmval)
 151 {
 152         __be32 status;
 153
 154         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 155         if (status)
 156                 /*
 157                  * We should probably fail the whole open at this point,
 158                  * but we've already created the file, so it's too late;
 159                  * So this seems the least of evils:
 160                  */
 161                 bmval[0] &= ~FATTR4_WORD0_ACL;
 162 }
 163
 164 static inline void
 165 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 166 {
 167         fh_put(dst);
 168         dget(src->fh_dentry);
 169         if (src->fh_export)
 170                 exp_get(src->fh_export);
 171         *dst = *src;
 172 }
 173
 174 static __be32
 175 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 176 {
 177         __be32 status;
 178
 179         if (open->op_truncate &&
 180                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 181                 return nfserr_inval;
 182
 183         accmode |= NFSD_MAY_READ_IF_EXEC;
 184
 185         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 186                 accmode |= NFSD_MAY_READ;
 187         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 188                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 189         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 190                 accmode |= NFSD_MAY_WRITE;
 191
 192         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 193
 194         return status;
 195 }
 196
 197 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 198 {
 199         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 200
 201         if (S_ISREG(mode))
 202                 return nfs_ok;
 203         if (S_ISDIR(mode))
 204                 return nfserr_isdir;
 205         /*
 206          * Using err_symlink as our catch-all case may look odd; but
 207          * there's no other obvious error for this case in 4.0, and we
 208          * happen to know that it will cause the linux v4 client to do
 209          * the right thing on attempts to open something other than a
 210          * regular file.
 211          */
 212         return nfserr_symlink;
 213 }
 214
 215 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 216 {
 217         if (nfsd4_has_session(cstate))
 218                 return;
 219         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 220                         &resfh->fh_handle);
 221 }
 222
 223 static __be32
 224 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 225 {
 226         struct svc_fh *current_fh = &cstate->current_fh;
 227         int accmode;
 228         __be32 status;
 229
 230         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 231         if (!*resfh)
 232                 return nfserr_jukebox;
 233         fh_init(*resfh, NFS4_FHSIZE);
 234         open->op_truncate = 0;
 235
 236         if (open->op_create) {
 237                 /* FIXME: check session persistence and pnfs flags.
 238                  * The nfsv4.1 spec requires the following semantics:
 239                  *
 240                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 241                  * Reply Cache  | server |                 |
 242                  * -------------+--------+-----------------+--------------------
 243                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 244                  *              |        |                 | (SHOULD)
 245                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 246                  *              |        |                 | (SHOULD NOT)
 247                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 248                  * yes          | no     | GUARDED4        | GUARDED4
 249                  * yes          | yes    | GUARDED4        | GUARDED4
 250                  */
 251
 252                 /*
 253                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 254                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 255                  */
 256                 current->fs->umask = open->op_umask;
 257                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 258                                         open->op_fname.len, &open->op_iattr,
 259                                         *resfh, open->op_createmode,
 260                                         (u32 *)open->op_verf.data,
 261                                         &open->op_truncate, &open->op_created);
 262                 current->fs->umask = 0;
 263
 264                 if (!status && open->op_label.len)
 265                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 266
 267                 /*
 268                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 269                  * use the returned bitmask to indicate which attributes
 270                  * we used to store the verifier:
 271                  */
 272                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 273                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 274                                                 FATTR4_WORD1_TIME_MODIFY);
 275         } else
 276                 /*
 277                  * Note this may exit with the parent still locked.
 278                  * We will hold the lock until nfsd4_open's final
 279                  * lookup, to prevent renames or unlinks until we've had
 280                  * a chance to an acquire a delegation if appropriate.
 281                  */
 282                 status = nfsd_lookup(rqstp, current_fh,
 283                                      open->op_fname.data, open->op_fname.len, *resfh);
 284         if (status)
 285                 goto out;
 286         status = nfsd_check_obj_isreg(*resfh);
 287         if (status)
 288                 goto out;
 289
 290         if (is_create_with_attrs(open) && open->op_acl != NULL)
 291                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 292
 293         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 294         accmode = NFSD_MAY_NOP;
 295         if (open->op_created ||
 296                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 297                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 298         status = do_open_permission(rqstp, *resfh, open, accmode);
 299         set_change_info(&open->op_cinfo, current_fh);
 300 out:
 301         return status;
 302 }
 303
 304 static __be32
 305 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 306 {
 307         struct svc_fh *current_fh = &cstate->current_fh;
 308         __be32 status;
 309         int accmode = 0;
 310
 311         /* We don't know the target directory, and therefore can not
 312         * set the change info
 313         */
 314
 315         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 316
 317         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 318
 319         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 320                 (open->op_iattr.ia_size == 0);
 321         /*
 322          * In the delegation case, the client is telling us about an
 323          * open that it *already* performed locally, some time ago.  We
 324          * should let it succeed now if possible.
 325          *
 326          * In the case of a CLAIM_FH open, on the other hand, the client
 327          * may be counting on us to enforce permissions (the Linux 4.1
 328          * client uses this for normal opens, for example).
 329          */
 330         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 331                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 332
 333         status = do_open_permission(rqstp, current_fh, open, accmode);
 334
 335         return status;
 336 }
 337
 338 static void
 339 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 340 {
 341         struct nfsd4_sessionid *sid =
 342                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 343
 344         clid->cl_boot = sid->clientid.cl_boot;
 345         clid->cl_id = sid->clientid.cl_id;
 346 }
 347
 348 static __be32
 349 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 350            union nfsd4_op_u *u)
 351 {
 352         struct nfsd4_open *open = &u->open;
 353         __be32 status;
 354         struct svc_fh *resfh = NULL;
 355         struct net *net = SVC_NET(rqstp);
 356         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 357
 358         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 359                 (int)open->op_fname.len, open->op_fname.data,
 360                 open->op_openowner);
 361
 362         /* This check required by spec. */
 363         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 364                 return nfserr_inval;
 365
 366         open->op_created = 0;
 367         /*
 368          * RFC5661 18.51.3
 369          * Before RECLAIM_COMPLETE done, server should deny new lock
 370          */
 371         if (nfsd4_has_session(cstate) &&
 372             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 373                       &cstate->session->se_client->cl_flags) &&
 374             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 375                 return nfserr_grace;
 376
 377         if (nfsd4_has_session(cstate))
 378                 copy_clientid(&open->op_clientid, cstate->session);
 379
 380         /* check seqid for replay. set nfs4_owner */
 381         status = nfsd4_process_open1(cstate, open, nn);
 382         if (status == nfserr_replay_me) {
 383                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 384                 fh_put(&cstate->current_fh);
 385                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 386                                 &rp->rp_openfh);
 387                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 388                 if (status)
 389                         dprintk("nfsd4_open: replay failed"
 390                                 " restoring previous filehandle\n");
 391                 else
 392                         status = nfserr_replay_me;
 393         }
 394         if (status)
 395                 goto out;
 396         if (open->op_xdr_error) {
 397                 status = open->op_xdr_error;
 398                 goto out;
 399         }
 400
 401         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 402         if (status)
 403                 goto out;
 404
 405         /* Openowner is now set, so sequence id will get bumped.  Now we need
 406          * these checks before we do any creates: */
 407         status = nfserr_grace;
 408         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 409                 goto out;
 410         status = nfserr_no_grace;
 411         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 412                 goto out;
 413
 414         switch (open->op_claim_type) {
 415                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 416                 case NFS4_OPEN_CLAIM_NULL:
 417                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 418                         if (status)
 419                                 goto out;
 420                         break;
 421                 case NFS4_OPEN_CLAIM_PREVIOUS:
 422                         status = nfs4_check_open_reclaim(&open->op_clientid,
 423                                                          cstate, nn);
 424                         if (status)
 425                                 goto out;
 426                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 427                 case NFS4_OPEN_CLAIM_FH:
 428                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 429                         status = do_open_fhandle(rqstp, cstate, open);
 430                         if (status)
 431                                 goto out;
 432                         resfh = &cstate->current_fh;
 433                         break;
 434                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 435                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 436                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 437                                 open->op_claim_type);
 438                         status = nfserr_notsupp;
 439                         goto out;
 440                 default:
 441                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 442                                 open->op_claim_type);
 443                         status = nfserr_inval;
 444                         goto out;
 445         }
 446         /*
 447          * nfsd4_process_open2() does the actual opening of the file.  If
 448          * successful, it (1) truncates the file if open->op_truncate was
 449          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 450          */
 451         status = nfsd4_process_open2(rqstp, resfh, open);
 452         WARN(status && open->op_created,
 453              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 454              be32_to_cpu(status));
 455 out:
 456         if (resfh && resfh != &cstate->current_fh) {
 457                 fh_dup2(&cstate->current_fh, resfh);
 458                 fh_put(resfh);
 459                 kfree(resfh);
 460         }
 461         nfsd4_cleanup_open_state(cstate, open);
 462         nfsd4_bump_seqid(cstate, status);
 463         return status;
 464 }
 465
 466 /*
 467  * OPEN is the only seqid-mutating operation whose decoding can fail
 468  * with a seqid-mutating error (specifically, decoding of user names in
 469  * the attributes).  Therefore we have to do some processing to look up
 470  * the stateowner so that we can bump the seqid.
 471  */
 472 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 473 {
 474         struct nfsd4_open *open = &op->u.open;
 475
 476         if (!seqid_mutating_err(ntohl(op->status)))
 477                 return op->status;
 478         if (nfsd4_has_session(cstate))
 479                 return op->status;
 480         open->op_xdr_error = op->status;
 481         return nfsd4_open(rqstp, cstate, &op->u);
 482 }
 483
 484 /*
 485  * filehandle-manipulating ops.
 486  */
 487 static __be32
 488 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 489             union nfsd4_op_u *u)
 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         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 539         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 540                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 541                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 542         }
 543         return nfs_ok;
 544 }
 545
 546 /*
 547  * misc nfsv4 ops
 548  */
 549 static __be32
 550 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 551              union nfsd4_op_u *u)
 552 {
 553         struct nfsd4_access *access = &u->access;
 554
 555         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 556                 return nfserr_inval;
 557
 558         access->ac_resp_access = access->ac_req_access;
 559         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 560                            &access->ac_supported);
 561 }
 562
 563 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 564 {
 565         __be32 verf[2];
 566         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 567
 568         /*
 569          * This is opaque to client, so no need to byte-swap. Use
 570          * __force to keep sparse happy. y2038 time_t overflow is
 571          * irrelevant in this usage.
 572          */
 573         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 574         verf[1] = (__force __be32)nn->nfssvc_boot.tv_nsec;
 575         memcpy(verifier->data, verf, sizeof(verifier->data));
 576 }
 577
 578 static __be32
 579 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 580              union nfsd4_op_u *u)
 581 {
 582         struct nfsd4_commit *commit = &u->commit;
 583
 584         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 585         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 586                              commit->co_count);
 587 }
 588
 589 static __be32
 590 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 591              union nfsd4_op_u *u)
 592 {
 593         struct nfsd4_create *create = &u->create;
 594         struct svc_fh resfh;
 595         __be32 status;
 596         dev_t rdev;
 597
 598         fh_init(&resfh, NFS4_FHSIZE);
 599
 600         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 601         if (status)
 602                 return status;
 603
 604         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 605                                     nfsd_attrmask);
 606         if (status)
 607                 return status;
 608
 609         current->fs->umask = create->cr_umask;
 610         switch (create->cr_type) {
 611         case NF4LNK:
 612                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 613                                       create->cr_name, create->cr_namelen,
 614                                       create->cr_data, &resfh);
 615                 break;
 616
 617         case NF4BLK:
 618                 status = nfserr_inval;
 619                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 620                 if (MAJOR(rdev) != create->cr_specdata1 ||
 621                     MINOR(rdev) != create->cr_specdata2)
 622                         goto out_umask;
 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                 status = nfserr_inval;
 630                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 631                 if (MAJOR(rdev) != create->cr_specdata1 ||
 632                     MINOR(rdev) != create->cr_specdata2)
 633                         goto out_umask;
 634                 status = nfsd_create(rqstp, &cstate->current_fh,
 635                                      create->cr_name, create->cr_namelen,
 636                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 637                 break;
 638
 639         case NF4SOCK:
 640                 status = nfsd_create(rqstp, &cstate->current_fh,
 641                                      create->cr_name, create->cr_namelen,
 642                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 643                 break;
 644
 645         case NF4FIFO:
 646                 status = nfsd_create(rqstp, &cstate->current_fh,
 647                                      create->cr_name, create->cr_namelen,
 648                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 649                 break;
 650
 651         case NF4DIR:
 652                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 653                 status = nfsd_create(rqstp, &cstate->current_fh,
 654                                      create->cr_name, create->cr_namelen,
 655                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 656                 break;
 657
 658         default:
 659                 status = nfserr_badtype;
 660         }
 661
 662         if (status)
 663                 goto out;
 664
 665         if (create->cr_label.len)
 666                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 667
 668         if (create->cr_acl != NULL)
 669                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 670                                 create->cr_bmval);
 671
 672         fh_unlock(&cstate->current_fh);
 673         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 674         fh_dup2(&cstate->current_fh, &resfh);
 675 out:
 676         fh_put(&resfh);
 677 out_umask:
 678         current->fs->umask = 0;
 679         return status;
 680 }
 681
 682 static __be32
 683 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 684               union nfsd4_op_u *u)
 685 {
 686         struct nfsd4_getattr *getattr = &u->getattr;
 687         __be32 status;
 688
 689         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 690         if (status)
 691                 return status;
 692
 693         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 694                 return nfserr_inval;
 695
 696         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 697         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 698         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 699
 700         getattr->ga_fhp = &cstate->current_fh;
 701         return nfs_ok;
 702 }
 703
 704 static __be32
 705 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 706            union nfsd4_op_u *u)
 707 {
 708         struct nfsd4_link *link = &u->link;
 709         __be32 status;
 710
 711         status = nfsd_link(rqstp, &cstate->current_fh,
 712                            link->li_name, link->li_namelen, &cstate->save_fh);
 713         if (!status)
 714                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 715         return status;
 716 }
 717
 718 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 719 {
 720         struct svc_fh tmp_fh;
 721         __be32 ret;
 722
 723         fh_init(&tmp_fh, NFS4_FHSIZE);
 724         ret = exp_pseudoroot(rqstp, &tmp_fh);
 725         if (ret)
 726                 return ret;
 727         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 728                 fh_put(&tmp_fh);
 729                 return nfserr_noent;
 730         }
 731         fh_put(&tmp_fh);
 732         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 733 }
 734
 735 static __be32
 736 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 737               union nfsd4_op_u *u)
 738 {
 739         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 740 }
 741
 742 static __be32
 743 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 744              union nfsd4_op_u *u)
 745 {
 746         return nfsd_lookup(rqstp, &cstate->current_fh,
 747                            u->lookup.lo_name, u->lookup.lo_len,
 748                            &cstate->current_fh);
 749 }
 750
 751 static __be32
 752 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 753            union nfsd4_op_u *u)
 754 {
 755         struct nfsd4_read *read = &u->read;
 756         __be32 status;
 757
 758         read->rd_filp = NULL;
 759         if (read->rd_offset >= OFFSET_MAX)
 760                 return nfserr_inval;
 761
 762         trace_nfsd_read_start(rqstp, &cstate->current_fh,
 763                               read->rd_offset, read->rd_length);
 764
 765         /*
 766          * If we do a zero copy read, then a client will see read data
 767          * that reflects the state of the file *after* performing the
 768          * following compound.
 769          *
 770          * To ensure proper ordering, we therefore turn off zero copy if
 771          * the client wants us to do more in this compound:
 772          */
 773         if (!nfsd4_last_compound_op(rqstp))
 774                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 775
 776         /* check stateid */
 777         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 778                                         &read->rd_stateid, RD_STATE,
 779                                         &read->rd_filp, &read->rd_tmp_file);
 780         if (status) {
 781                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 782                 goto out;
 783         }
 784         status = nfs_ok;
 785 out:
 786         read->rd_rqstp = rqstp;
 787         read->rd_fhp = &cstate->current_fh;
 788         return status;
 789 }
 790
 791
 792 static void
 793 nfsd4_read_release(union nfsd4_op_u *u)
 794 {
 795         if (u->read.rd_filp)
 796                 fput(u->read.rd_filp);
 797         trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
 798                              u->read.rd_offset, u->read.rd_length);
 799 }
 800
 801 static __be32
 802 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 803               union nfsd4_op_u *u)
 804 {
 805         struct nfsd4_readdir *readdir = &u->readdir;
 806         u64 cookie = readdir->rd_cookie;
 807         static const nfs4_verifier zeroverf;
 808
 809         /* no need to check permission - this will be done in nfsd_readdir() */
 810
 811         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 812                 return nfserr_inval;
 813
 814         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 815         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 816         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 817
 818         if ((cookie == 1) || (cookie == 2) ||
 819             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 820                 return nfserr_bad_cookie;
 821
 822         readdir->rd_rqstp = rqstp;
 823         readdir->rd_fhp = &cstate->current_fh;
 824         return nfs_ok;
 825 }
 826
 827 static __be32
 828 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 829                union nfsd4_op_u *u)
 830 {
 831         u->readlink.rl_rqstp = rqstp;
 832         u->readlink.rl_fhp = &cstate->current_fh;
 833         return nfs_ok;
 834 }
 835
 836 static __be32
 837 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 838              union nfsd4_op_u *u)
 839 {
 840         struct nfsd4_remove *remove = &u->remove;
 841         __be32 status;
 842
 843         if (opens_in_grace(SVC_NET(rqstp)))
 844                 return nfserr_grace;
 845         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 846                              remove->rm_name, remove->rm_namelen);
 847         if (!status) {
 848                 fh_unlock(&cstate->current_fh);
 849                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 850         }
 851         return status;
 852 }
 853
 854 static __be32
 855 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 856              union nfsd4_op_u *u)
 857 {
 858         struct nfsd4_rename *rename = &u->rename;
 859         __be32 status;
 860
 861         if (opens_in_grace(SVC_NET(rqstp)) &&
 862                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 863                 return nfserr_grace;
 864         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 865                              rename->rn_snamelen, &cstate->current_fh,
 866                              rename->rn_tname, rename->rn_tnamelen);
 867         if (status)
 868                 return status;
 869         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 870         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 871         return nfs_ok;
 872 }
 873
 874 static __be32
 875 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 876               union nfsd4_op_u *u)
 877 {
 878         struct nfsd4_secinfo *secinfo = &u->secinfo;
 879         struct svc_export *exp;
 880         struct dentry *dentry;
 881         __be32 err;
 882
 883         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 884         if (err)
 885                 return err;
 886         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 887                                     secinfo->si_name, secinfo->si_namelen,
 888                                     &exp, &dentry);
 889         if (err)
 890                 return err;
 891         fh_unlock(&cstate->current_fh);
 892         if (d_really_is_negative(dentry)) {
 893                 exp_put(exp);
 894                 err = nfserr_noent;
 895         } else
 896                 secinfo->si_exp = exp;
 897         dput(dentry);
 898         if (cstate->minorversion)
 899                 /* See rfc 5661 section 2.6.3.1.1.8 */
 900                 fh_put(&cstate->current_fh);
 901         return err;
 902 }
 903
 904 static __be32
 905 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 906                 union nfsd4_op_u *u)
 907 {
 908         __be32 err;
 909
 910         switch (u->secinfo_no_name.sin_style) {
 911         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 912                 break;
 913         case NFS4_SECINFO_STYLE4_PARENT:
 914                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 915                 if (err)
 916                         return err;
 917                 break;
 918         default:
 919                 return nfserr_inval;
 920         }
 921
 922         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 923         fh_put(&cstate->current_fh);
 924         return nfs_ok;
 925 }
 926
 927 static void
 928 nfsd4_secinfo_release(union nfsd4_op_u *u)
 929 {
 930         if (u->secinfo.si_exp)
 931                 exp_put(u->secinfo.si_exp);
 932 }
 933
 934 static void
 935 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
 936 {
 937         if (u->secinfo_no_name.sin_exp)
 938                 exp_put(u->secinfo_no_name.sin_exp);
 939 }
 940
 941 static __be32
 942 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 943               union nfsd4_op_u *u)
 944 {
 945         struct nfsd4_setattr *setattr = &u->setattr;
 946         __be32 status = nfs_ok;
 947         int err;
 948
 949         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 950                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 951                                 &cstate->current_fh, &setattr->sa_stateid,
 952                                 WR_STATE, NULL, NULL);
 953                 if (status) {
 954                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 955                         return status;
 956                 }
 957         }
 958         err = fh_want_write(&cstate->current_fh);
 959         if (err)
 960                 return nfserrno(err);
 961         status = nfs_ok;
 962
 963         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 964                                     nfsd_attrmask);
 965         if (status)
 966                 goto out;
 967
 968         if (setattr->sa_acl != NULL)
 969                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 970                                             setattr->sa_acl);
 971         if (status)
 972                 goto out;
 973         if (setattr->sa_label.len)
 974                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 975                                 &setattr->sa_label);
 976         if (status)
 977                 goto out;
 978         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 979                                 0, (time_t)0);
 980 out:
 981         fh_drop_write(&cstate->current_fh);
 982         return status;
 983 }
 984
 985 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 986 {
 987         int i = 1;
 988         int buflen = write->wr_buflen;
 989
 990         vec[0].iov_base = write->wr_head.iov_base;
 991         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 992         buflen -= vec[0].iov_len;
 993
 994         while (buflen) {
 995                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 996                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 997                 buflen -= vec[i].iov_len;
 998                 i++;
 999         }
1000         return i;
1001 }
1002
1003 static __be32
1004 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1005             union nfsd4_op_u *u)
1006 {
1007         struct nfsd4_write *write = &u->write;
1008         stateid_t *stateid = &write->wr_stateid;
1009         struct file *filp = NULL;
1010         __be32 status = nfs_ok;
1011         unsigned long cnt;
1012         int nvecs;
1013
1014         if (write->wr_offset >= OFFSET_MAX)
1015                 return nfserr_inval;
1016
1017         cnt = write->wr_buflen;
1018         trace_nfsd_write_start(rqstp, &cstate->current_fh,
1019                                write->wr_offset, cnt);
1020         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1021                                                 stateid, WR_STATE, &filp, NULL);
1022         if (status) {
1023                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1024                 return status;
1025         }
1026
1027         write->wr_how_written = write->wr_stable_how;
1028         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1029
1030         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1031         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1032
1033         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1034                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1035                                 write->wr_how_written);
1036         fput(filp);
1037
1038         write->wr_bytes_written = cnt;
1039         trace_nfsd_write_done(rqstp, &cstate->current_fh,
1040                               write->wr_offset, cnt);
1041         return status;
1042 }
1043
1044 static __be32
1045 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1046                   stateid_t *src_stateid, struct file **src,
1047                   stateid_t *dst_stateid, struct file **dst)
1048 {
1049         __be32 status;
1050
1051         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1052                                             src_stateid, RD_STATE, src, NULL);
1053         if (status) {
1054                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1055                 goto out;
1056         }
1057
1058         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1059                                             dst_stateid, WR_STATE, dst, NULL);
1060         if (status) {
1061                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1062                 goto out_put_src;
1063         }
1064
1065         /* fix up for NFS-specific error code */
1066         if (!S_ISREG(file_inode(*src)->i_mode) ||
1067             !S_ISREG(file_inode(*dst)->i_mode)) {
1068                 status = nfserr_wrong_type;
1069                 goto out_put_dst;
1070         }
1071
1072 out:
1073         return status;
1074 out_put_dst:
1075         fput(*dst);
1076 out_put_src:
1077         fput(*src);
1078         goto out;
1079 }
1080
1081 static __be32
1082 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1083                 union nfsd4_op_u *u)
1084 {
1085         struct nfsd4_clone *clone = &u->clone;
1086         struct file *src, *dst;
1087         __be32 status;
1088
1089         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1090                                    &clone->cl_dst_stateid, &dst);
1091         if (status)
1092                 goto out;
1093
1094         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1095                         dst, clone->cl_dst_pos, clone->cl_count);
1096
1097         fput(dst);
1098         fput(src);
1099 out:
1100         return status;
1101 }
1102
1103 static __be32
1104 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1105                 union nfsd4_op_u *u)
1106 {
1107         struct nfsd4_copy *copy = &u->copy;
1108         struct file *src, *dst;
1109         __be32 status;
1110         ssize_t bytes;
1111
1112         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1113                                    &copy->cp_dst_stateid, &dst);
1114         if (status)
1115                 goto out;
1116
1117         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1118                         dst, copy->cp_dst_pos, copy->cp_count);
1119
1120         if (bytes < 0)
1121                 status = nfserrno(bytes);
1122         else {
1123                 copy->cp_res.wr_bytes_written = bytes;
1124                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1125                 copy->cp_synchronous = 1;
1126                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1127                 status = nfs_ok;
1128         }
1129
1130         fput(src);
1131         fput(dst);
1132 out:
1133         return status;
1134 }
1135
1136 static __be32
1137 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1138                 struct nfsd4_fallocate *fallocate, int flags)
1139 {
1140         __be32 status = nfserr_notsupp;
1141         struct file *file;
1142
1143         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1144                                             &fallocate->falloc_stateid,
1145                                             WR_STATE, &file, NULL);
1146         if (status != nfs_ok) {
1147                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1148                 return status;
1149         }
1150
1151         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1152                                      fallocate->falloc_offset,
1153                                      fallocate->falloc_length,
1154                                      flags);
1155         fput(file);
1156         return status;
1157 }
1158
1159 static __be32
1160 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1161                union nfsd4_op_u *u)
1162 {
1163         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1164 }
1165
1166 static __be32
1167 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1168                  union nfsd4_op_u *u)
1169 {
1170         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1171                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1172 }
1173
1174 static __be32
1175 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1176            union nfsd4_op_u *u)
1177 {
1178         struct nfsd4_seek *seek = &u->seek;
1179         int whence;
1180         __be32 status;
1181         struct file *file;
1182
1183         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1184                                             &seek->seek_stateid,
1185                                             RD_STATE, &file, NULL);
1186         if (status) {
1187                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1188                 return status;
1189         }
1190
1191         switch (seek->seek_whence) {
1192         case NFS4_CONTENT_DATA:
1193                 whence = SEEK_DATA;
1194                 break;
1195         case NFS4_CONTENT_HOLE:
1196                 whence = SEEK_HOLE;
1197                 break;
1198         default:
1199                 status = nfserr_union_notsupp;
1200                 goto out;
1201         }
1202
1203         /*
1204          * Note:  This call does change file->f_pos, but nothing in NFSD
1205          *        should ever file->f_pos.
1206          */
1207         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1208         if (seek->seek_pos < 0)
1209                 status = nfserrno(seek->seek_pos);
1210         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1211                 seek->seek_eof = true;
1212
1213 out:
1214         fput(file);
1215         return status;
1216 }
1217
1218 /* This routine never returns NFS_OK!  If there are no other errors, it
1219  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1220  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1221  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1222  */
1223 static __be32
1224 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1225              struct nfsd4_verify *verify)
1226 {
1227         __be32 *buf, *p;
1228         int count;
1229         __be32 status;
1230
1231         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1232         if (status)
1233                 return status;
1234
1235         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1236         if (status)
1237                 return status;
1238
1239         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1240             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1241                 return nfserr_inval;
1242         if (verify->ve_attrlen & 3)
1243                 return nfserr_inval;
1244
1245         /* count in words:
1246          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1247          */
1248         count = 4 + (verify->ve_attrlen >> 2);
1249         buf = kmalloc(count << 2, GFP_KERNEL);
1250         if (!buf)
1251                 return nfserr_jukebox;
1252
1253         p = buf;
1254         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1255                                     cstate->current_fh.fh_export,
1256                                     cstate->current_fh.fh_dentry,
1257                                     verify->ve_bmval,
1258                                     rqstp, 0);
1259         /*
1260          * If nfsd4_encode_fattr() ran out of space, assume that's because
1261          * the attributes are longer (hence different) than those given:
1262          */
1263         if (status == nfserr_resource)
1264                 status = nfserr_not_same;
1265         if (status)
1266                 goto out_kfree;
1267
1268         /* skip bitmap */
1269         p = buf + 1 + ntohl(buf[0]);
1270         status = nfserr_not_same;
1271         if (ntohl(*p++) != verify->ve_attrlen)
1272                 goto out_kfree;
1273         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1274                 status = nfserr_same;
1275
1276 out_kfree:
1277         kfree(buf);
1278         return status;
1279 }
1280
1281 static __be32
1282 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1283               union nfsd4_op_u *u)
1284 {
1285         __be32 status;
1286
1287         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1288         return status == nfserr_not_same ? nfs_ok : status;
1289 }
1290
1291 static __be32
1292 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1293              union nfsd4_op_u *u)
1294 {
1295         __be32 status;
1296
1297         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1298         return status == nfserr_same ? nfs_ok : status;
1299 }
1300
1301 #ifdef CONFIG_NFSD_PNFS
1302 static const struct nfsd4_layout_ops *
1303 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1304 {
1305         if (!exp->ex_layout_types) {
1306                 dprintk("%s: export does not support pNFS\n", __func__);
1307                 return NULL;
1308         }
1309
1310         if (layout_type >= LAYOUT_TYPE_MAX ||
1311             !(exp->ex_layout_types & (1 << layout_type))) {
1312                 dprintk("%s: layout type %d not supported\n",
1313                         __func__, layout_type);
1314                 return NULL;
1315         }
1316
1317         return nfsd4_layout_ops[layout_type];
1318 }
1319
1320 static __be32
1321 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1322                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1323 {
1324         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1325         const struct nfsd4_layout_ops *ops;
1326         struct nfsd4_deviceid_map *map;
1327         struct svc_export *exp;
1328         __be32 nfserr;
1329
1330         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1331                __func__,
1332                gdp->gd_layout_type,
1333                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1334                gdp->gd_maxcount);
1335
1336         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1337         if (!map) {
1338                 dprintk("%s: couldn't find device ID to export mapping!\n",
1339                         __func__);
1340                 return nfserr_noent;
1341         }
1342
1343         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1344         if (IS_ERR(exp)) {
1345                 dprintk("%s: could not find device id\n", __func__);
1346                 return nfserr_noent;
1347         }
1348
1349         nfserr = nfserr_layoutunavailable;
1350         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1351         if (!ops)
1352                 goto out;
1353
1354         nfserr = nfs_ok;
1355         if (gdp->gd_maxcount != 0) {
1356                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1357                                 rqstp, cstate->session->se_client, gdp);
1358         }
1359
1360         gdp->gd_notify_types &= ops->notify_types;
1361 out:
1362         exp_put(exp);
1363         return nfserr;
1364 }
1365
1366 static void
1367 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1368 {
1369         kfree(u->getdeviceinfo.gd_device);
1370 }
1371
1372 static __be32
1373 nfsd4_layoutget(struct svc_rqst *rqstp,
1374                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1375 {
1376         struct nfsd4_layoutget *lgp = &u->layoutget;
1377         struct svc_fh *current_fh = &cstate->current_fh;
1378         const struct nfsd4_layout_ops *ops;
1379         struct nfs4_layout_stateid *ls;
1380         __be32 nfserr;
1381         int accmode = NFSD_MAY_READ_IF_EXEC;
1382
1383         switch (lgp->lg_seg.iomode) {
1384         case IOMODE_READ:
1385                 accmode |= NFSD_MAY_READ;
1386                 break;
1387         case IOMODE_RW:
1388                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
1389                 break;
1390         default:
1391                 dprintk("%s: invalid iomode %d\n",
1392                         __func__, lgp->lg_seg.iomode);
1393                 nfserr = nfserr_badiomode;
1394                 goto out;
1395         }
1396
1397         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1398         if (nfserr)
1399                 goto out;
1400
1401         nfserr = nfserr_layoutunavailable;
1402         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1403         if (!ops)
1404                 goto out;
1405
1406         /*
1407          * Verify minlength and range as per RFC5661:
1408          *  o  If loga_length is less than loga_minlength,
1409          *     the metadata server MUST return NFS4ERR_INVAL.
1410          *  o  If the sum of loga_offset and loga_minlength exceeds
1411          *     NFS4_UINT64_MAX, and loga_minlength is not
1412          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1413          *  o  If the sum of loga_offset and loga_length exceeds
1414          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1415          *     the error NFS4ERR_INVAL MUST result.
1416          */
1417         nfserr = nfserr_inval;
1418         if (lgp->lg_seg.length < lgp->lg_minlength ||
1419             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1420              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1421             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1422              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1423                 goto out;
1424         if (lgp->lg_seg.length == 0)
1425                 goto out;
1426
1427         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1428                                                 true, lgp->lg_layout_type, &ls);
1429         if (nfserr) {
1430                 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
1431                 goto out;
1432         }
1433
1434         nfserr = nfserr_recallconflict;
1435         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1436                 goto out_put_stid;
1437
1438         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1439                                      current_fh, lgp);
1440         if (nfserr)
1441                 goto out_put_stid;
1442
1443         nfserr = nfsd4_insert_layout(lgp, ls);
1444
1445 out_put_stid:
1446         mutex_unlock(&ls->ls_mutex);
1447         nfs4_put_stid(&ls->ls_stid);
1448 out:
1449         return nfserr;
1450 }
1451
1452 static void
1453 nfsd4_layoutget_release(union nfsd4_op_u *u)
1454 {
1455         kfree(u->layoutget.lg_content);
1456 }
1457
1458 static __be32
1459 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1460                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1461 {
1462         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1463         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1464         struct svc_fh *current_fh = &cstate->current_fh;
1465         const struct nfsd4_layout_ops *ops;
1466         loff_t new_size = lcp->lc_last_wr + 1;
1467         struct inode *inode;
1468         struct nfs4_layout_stateid *ls;
1469         __be32 nfserr;
1470
1471         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1472         if (nfserr)
1473                 goto out;
1474
1475         nfserr = nfserr_layoutunavailable;
1476         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1477         if (!ops)
1478                 goto out;
1479         inode = d_inode(current_fh->fh_dentry);
1480
1481         nfserr = nfserr_inval;
1482         if (new_size <= seg->offset) {
1483                 dprintk("pnfsd: last write before layout segment\n");
1484                 goto out;
1485         }
1486         if (new_size > seg->offset + seg->length) {
1487                 dprintk("pnfsd: last write beyond layout segment\n");
1488                 goto out;
1489         }
1490         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1491                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1492                 goto out;
1493         }
1494
1495         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1496                                                 false, lcp->lc_layout_type,
1497                                                 &ls);
1498         if (nfserr) {
1499                 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
1500                 /* fixup error code as per RFC5661 */
1501                 if (nfserr == nfserr_bad_stateid)
1502                         nfserr = nfserr_badlayout;
1503                 goto out;
1504         }
1505
1506         /* LAYOUTCOMMIT does not require any serialization */
1507         mutex_unlock(&ls->ls_mutex);
1508
1509         if (new_size > i_size_read(inode)) {
1510                 lcp->lc_size_chg = 1;
1511                 lcp->lc_newsize = new_size;
1512         } else {
1513                 lcp->lc_size_chg = 0;
1514         }
1515
1516         nfserr = ops->proc_layoutcommit(inode, lcp);
1517         nfs4_put_stid(&ls->ls_stid);
1518 out:
1519         return nfserr;
1520 }
1521
1522 static __be32
1523 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1524                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1525 {
1526         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1527         struct svc_fh *current_fh = &cstate->current_fh;
1528         __be32 nfserr;
1529
1530         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1531         if (nfserr)
1532                 goto out;
1533
1534         nfserr = nfserr_layoutunavailable;
1535         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1536                 goto out;
1537
1538         switch (lrp->lr_seg.iomode) {
1539         case IOMODE_READ:
1540         case IOMODE_RW:
1541         case IOMODE_ANY:
1542                 break;
1543         default:
1544                 dprintk("%s: invalid iomode %d\n", __func__,
1545                         lrp->lr_seg.iomode);
1546                 nfserr = nfserr_inval;
1547                 goto out;
1548         }
1549
1550         switch (lrp->lr_return_type) {
1551         case RETURN_FILE:
1552                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1553                 break;
1554         case RETURN_FSID:
1555         case RETURN_ALL:
1556                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1557                 break;
1558         default:
1559                 dprintk("%s: invalid return_type %d\n", __func__,
1560                         lrp->lr_return_type);
1561                 nfserr = nfserr_inval;
1562                 break;
1563         }
1564 out:
1565         return nfserr;
1566 }
1567 #endif /* CONFIG_NFSD_PNFS */
1568
1569 /*
1570  * NULL call.
1571  */
1572 static __be32
1573 nfsd4_proc_null(struct svc_rqst *rqstp)
1574 {
1575         return nfs_ok;
1576 }
1577
1578 static inline void nfsd4_increment_op_stats(u32 opnum)
1579 {
1580         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1581                 nfsdstats.nfs4_opcount[opnum]++;
1582 }
1583
1584 static const struct nfsd4_operation nfsd4_ops[];
1585
1586 static const char *nfsd4_op_name(unsigned opnum);
1587
1588 /*
1589  * Enforce NFSv4.1 COMPOUND ordering rules:
1590  *
1591  * Also note, enforced elsewhere:
1592  *      - SEQUENCE other than as first op results in
1593  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1594  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1595  *        (Enforced in nfsd4_bind_conn_to_session().)
1596  *      - DESTROY_SESSION must be the final operation in a compound, if
1597  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1598  *        (Enforced in nfsd4_destroy_session().)
1599  */
1600 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1601 {
1602         struct nfsd4_op *op = &args->ops[0];
1603
1604         /* These ordering requirements don't apply to NFSv4.0: */
1605         if (args->minorversion == 0)
1606                 return nfs_ok;
1607         /* This is weird, but OK, not our problem: */
1608         if (args->opcnt == 0)
1609                 return nfs_ok;
1610         if (op->status == nfserr_op_illegal)
1611                 return nfs_ok;
1612         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1613                 return nfserr_op_not_in_session;
1614         if (op->opnum == OP_SEQUENCE)
1615                 return nfs_ok;
1616         if (args->opcnt != 1)
1617                 return nfserr_not_only_op;
1618         return nfs_ok;
1619 }
1620
1621 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1622 {
1623         return &nfsd4_ops[op->opnum];
1624 }
1625
1626 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1627 {
1628         if (op->opnum == OP_ILLEGAL)
1629                 return false;
1630         return OPDESC(op)->op_flags & OP_CACHEME;
1631 }
1632
1633 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1634 {
1635         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1636         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1637         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1638         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1639         const struct nfsd4_operation *thisd = OPDESC(this);
1640         const struct nfsd4_operation *nextd;
1641
1642         /*
1643          * Most ops check wronsec on our own; only the putfh-like ops
1644          * have special rules.
1645          */
1646         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1647                 return false;
1648         /*
1649          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1650          * put-filehandle operation if we're not going to use the
1651          * result:
1652          */
1653         if (argp->opcnt == resp->opcnt)
1654                 return false;
1655         if (next->opnum == OP_ILLEGAL)
1656                 return false;
1657         nextd = OPDESC(next);
1658         /*
1659          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1660          * errors themselves as necessary; others should check for them
1661          * now:
1662          */
1663         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1664 }
1665
1666 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1667                                struct nfsd4_compoundres *resp)
1668 {
1669         struct xdr_stream *xdr = &resp->xdr;
1670         struct xdr_buf *buf = &rqstp->rq_res;
1671         struct kvec *head = buf->head;
1672
1673         xdr->buf = buf;
1674         xdr->iov = head;
1675         xdr->p   = head->iov_base + head->iov_len;
1676         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1677         /* Tail and page_len should be zero at this point: */
1678         buf->len = buf->head[0].iov_len;
1679         xdr->scratch.iov_len = 0;
1680         xdr->page_ptr = buf->pages - 1;
1681         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1682                 - rqstp->rq_auth_slack;
1683 }
1684
1685 /*
1686  * COMPOUND call.
1687  */
1688 static __be32
1689 nfsd4_proc_compound(struct svc_rqst *rqstp)
1690 {
1691         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1692         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1693         struct nfsd4_op *op;
1694         struct nfsd4_compound_state *cstate = &resp->cstate;
1695         struct svc_fh *current_fh = &cstate->current_fh;
1696         struct svc_fh *save_fh = &cstate->save_fh;
1697         __be32          status;
1698
1699         svcxdr_init_encode(rqstp, resp);
1700         resp->tagp = resp->xdr.p;
1701         /* reserve space for: taglen, tag, and opcnt */
1702         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1703         resp->taglen = args->taglen;
1704         resp->tag = args->tag;
1705         resp->rqstp = rqstp;
1706         cstate->minorversion = args->minorversion;
1707         fh_init(current_fh, NFS4_FHSIZE);
1708         fh_init(save_fh, NFS4_FHSIZE);
1709         /*
1710          * Don't use the deferral mechanism for NFSv4; compounds make it
1711          * too hard to avoid non-idempotency problems.
1712          */
1713         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1714
1715         /*
1716          * According to RFC3010, this takes precedence over all other errors.
1717          */
1718         status = nfserr_minor_vers_mismatch;
1719         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1720                 goto out;
1721         status = nfserr_resource;
1722         if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1723                 goto out;
1724
1725         status = nfs41_check_op_ordering(args);
1726         if (status) {
1727                 op = &args->ops[0];
1728                 op->status = status;
1729                 goto encode_op;
1730         }
1731
1732         trace_nfsd_compound(rqstp, args->opcnt);
1733         while (!status && resp->opcnt < args->opcnt) {
1734                 op = &args->ops[resp->opcnt++];
1735
1736                 /*
1737                  * The XDR decode routines may have pre-set op->status;
1738                  * for example, if there is a miscellaneous XDR error
1739                  * it will be set to nfserr_bad_xdr.
1740                  */
1741                 if (op->status) {
1742                         if (op->opnum == OP_OPEN)
1743                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1744                         goto encode_op;
1745                 }
1746
1747                 if (!current_fh->fh_dentry) {
1748                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1749                                 op->status = nfserr_nofilehandle;
1750                                 goto encode_op;
1751                         }
1752                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1753                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1754                         op->status = nfserr_moved;
1755                         goto encode_op;
1756                 }
1757
1758                 fh_clear_wcc(current_fh);
1759
1760                 /* If op is non-idempotent */
1761                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1762                         /*
1763                          * Don't execute this op if we couldn't encode a
1764                          * succesful reply:
1765                          */
1766                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
1767                         /*
1768                          * Plus if there's another operation, make sure
1769                          * we'll have space to at least encode an error:
1770                          */
1771                         if (resp->opcnt < args->opcnt)
1772                                 plen += COMPOUND_ERR_SLACK_SPACE;
1773                         op->status = nfsd4_check_resp_size(resp, plen);
1774                 }
1775
1776                 if (op->status)
1777                         goto encode_op;
1778
1779                 if (op->opdesc->op_get_currentstateid)
1780                         op->opdesc->op_get_currentstateid(cstate, &op->u);
1781                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
1782
1783                 /* Only from SEQUENCE */
1784                 if (cstate->status == nfserr_replay_cache) {
1785                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1786                         status = op->status;
1787                         goto out;
1788                 }
1789                 if (!op->status) {
1790                         if (op->opdesc->op_set_currentstateid)
1791                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
1792
1793                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
1794                                 clear_current_stateid(cstate);
1795
1796                         if (need_wrongsec_check(rqstp))
1797                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1798                 }
1799 encode_op:
1800                 if (op->status == nfserr_replay_me) {
1801                         op->replay = &cstate->replay_owner->so_replay;
1802                         nfsd4_encode_replay(&resp->xdr, op);
1803                         status = op->status = op->replay->rp_status;
1804                 } else {
1805                         nfsd4_encode_operation(resp, op);
1806                         status = op->status;
1807                 }
1808
1809                 trace_nfsd_compound_status(args->opcnt, resp->opcnt, status,
1810                                            nfsd4_op_name(op->opnum));
1811
1812                 nfsd4_cstate_clear_replay(cstate);
1813                 nfsd4_increment_op_stats(op->opnum);
1814         }
1815
1816         cstate->status = status;
1817         fh_put(current_fh);
1818         fh_put(save_fh);
1819         BUG_ON(cstate->replay_owner);
1820 out:
1821         /* Reset deferral mechanism for RPC deferrals */
1822         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1823         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1824         return status;
1825 }
1826
1827 #define op_encode_hdr_size              (2)
1828 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1829 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1830 #define op_encode_change_info_maxsz     (5)
1831 #define nfs4_fattr_bitmap_maxsz         (4)
1832
1833 /* We'll fall back on returning no lockowner if run out of space: */
1834 #define op_encode_lockowner_maxsz       (0)
1835 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1836
1837 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1838
1839 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1840 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1841                                          op_encode_ace_maxsz)
1842
1843 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1844
1845 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1846 {
1847         return (op_encode_hdr_size) * sizeof(__be32);
1848 }
1849
1850 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1851 {
1852         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1853 }
1854
1855 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1856 {
1857         /* ac_supported, ac_resp_access */
1858         return (op_encode_hdr_size + 2)* sizeof(__be32);
1859 }
1860
1861 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1862 {
1863         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1864 }
1865
1866 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1867 {
1868         return (op_encode_hdr_size + op_encode_change_info_maxsz
1869                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1870 }
1871
1872 /*
1873  * Note since this is an idempotent operation we won't insist on failing
1874  * the op prematurely if the estimate is too large.  We may turn off splice
1875  * reads unnecessarily.
1876  */
1877 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1878                                       struct nfsd4_op *op)
1879 {
1880         u32 *bmap = op->u.getattr.ga_bmval;
1881         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1882         u32 ret = 0;
1883
1884         if (bmap0 & FATTR4_WORD0_ACL)
1885                 return svc_max_payload(rqstp);
1886         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1887                 return svc_max_payload(rqstp);
1888
1889         if (bmap1 & FATTR4_WORD1_OWNER) {
1890                 ret += IDMAP_NAMESZ + 4;
1891                 bmap1 &= ~FATTR4_WORD1_OWNER;
1892         }
1893         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1894                 ret += IDMAP_NAMESZ + 4;
1895                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1896         }
1897         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1898                 ret += NFS4_FHSIZE + 4;
1899                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1900         }
1901         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1902                 ret += NFS4_MAXLABELLEN + 12;
1903                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1904         }
1905         /*
1906          * Largest of remaining attributes are 16 bytes (e.g.,
1907          * supported_attributes)
1908          */
1909         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1910         /* bitmask, length */
1911         ret += 20;
1912         return ret;
1913 }
1914
1915 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1916 {
1917         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1918 }
1919
1920 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1921 {
1922         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1923                 * sizeof(__be32);
1924 }
1925
1926 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1927 {
1928         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1929                 * sizeof(__be32);
1930 }
1931
1932 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1933 {
1934         return (op_encode_hdr_size + op_encode_stateid_maxsz
1935                 + op_encode_change_info_maxsz + 1
1936                 + nfs4_fattr_bitmap_maxsz
1937                 + op_encode_delegation_maxsz) * sizeof(__be32);
1938 }
1939
1940 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1941 {
1942         u32 maxcount = 0, rlen = 0;
1943
1944         maxcount = svc_max_payload(rqstp);
1945         rlen = min(op->u.read.rd_length, maxcount);
1946
1947         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1948 }
1949
1950 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1951 {
1952         u32 maxcount = 0, rlen = 0;
1953
1954         maxcount = svc_max_payload(rqstp);
1955         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1956
1957         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1958                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1959 }
1960
1961 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1962 {
1963         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1964 }
1965
1966 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1967 {
1968         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1969                 * sizeof(__be32);
1970 }
1971
1972 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1973 {
1974         return (op_encode_hdr_size + op_encode_change_info_maxsz
1975                 + op_encode_change_info_maxsz) * sizeof(__be32);
1976 }
1977
1978 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1979                                        struct nfsd4_op *op)
1980 {
1981         return (op_encode_hdr_size
1982                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1983 }
1984
1985 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1986 {
1987         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1988                 * sizeof(__be32);
1989 }
1990
1991 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1992 {
1993         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1994 }
1995
1996 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1997 {
1998         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
1999                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2000 }
2001
2002 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2003 {
2004         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2005                                                                 sizeof(__be32);
2006 }
2007
2008 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2009 {
2010         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2011 }
2012
2013 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2014 {
2015         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2016                 1 + 1 + /* eir_flags, spr_how */\
2017                 4 + /* spo_must_enforce & _allow with bitmap */\
2018                 2 + /*eir_server_owner.so_minor_id */\
2019                 /* eir_server_owner.so_major_id<> */\
2020                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2021                 /* eir_server_scope<> */\
2022                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2023                 1 + /* eir_server_impl_id array length */\
2024                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2025 }
2026
2027 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2028 {
2029         return (op_encode_hdr_size + \
2030                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2031                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2032 }
2033
2034 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2035 {
2036         return (op_encode_hdr_size + \
2037                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2038                 2 + /* csr_sequence, csr_flags */\
2039                 op_encode_channel_attrs_maxsz + \
2040                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2041 }
2042
2043 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2044 {
2045         return (op_encode_hdr_size +
2046                 1 /* wr_callback */ +
2047                 op_encode_stateid_maxsz /* wr_callback */ +
2048                 2 /* wr_count */ +
2049                 1 /* wr_committed */ +
2050                 op_encode_verifier_maxsz +
2051                 1 /* cr_consecutive */ +
2052                 1 /* cr_synchronous */) * sizeof(__be32);
2053 }
2054
2055 #ifdef CONFIG_NFSD_PNFS
2056 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2057 {
2058         u32 maxcount = 0, rlen = 0;
2059
2060         maxcount = svc_max_payload(rqstp);
2061         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2062
2063         return (op_encode_hdr_size +
2064                 1 /* gd_layout_type*/ +
2065                 XDR_QUADLEN(rlen) +
2066                 2 /* gd_notify_types */) * sizeof(__be32);
2067 }
2068
2069 /*
2070  * At this stage we don't really know what layout driver will handle the request,
2071  * so we need to define an arbitrary upper bound here.
2072  */
2073 #define MAX_LAYOUT_SIZE         128
2074 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2075 {
2076         return (op_encode_hdr_size +
2077                 1 /* logr_return_on_close */ +
2078                 op_encode_stateid_maxsz +
2079                 1 /* nr of layouts */ +
2080                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2081 }
2082
2083 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2084 {
2085         return (op_encode_hdr_size +
2086                 1 /* locr_newsize */ +
2087                 2 /* ns_size */) * sizeof(__be32);
2088 }
2089
2090 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2091 {
2092         return (op_encode_hdr_size +
2093                 1 /* lrs_stateid */ +
2094                 op_encode_stateid_maxsz) * sizeof(__be32);
2095 }
2096 #endif /* CONFIG_NFSD_PNFS */
2097
2098
2099 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2100 {
2101         return (op_encode_hdr_size + 3) * sizeof(__be32);
2102 }
2103
2104 static const struct nfsd4_operation nfsd4_ops[] = {
2105         [OP_ACCESS] = {
2106                 .op_func = nfsd4_access,
2107                 .op_name = "OP_ACCESS",
2108                 .op_rsize_bop = nfsd4_access_rsize,
2109         },
2110         [OP_CLOSE] = {
2111                 .op_func = nfsd4_close,
2112                 .op_flags = OP_MODIFIES_SOMETHING,
2113                 .op_name = "OP_CLOSE",
2114                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2115                 .op_get_currentstateid = nfsd4_get_closestateid,
2116                 .op_set_currentstateid = nfsd4_set_closestateid,
2117         },
2118         [OP_COMMIT] = {
2119                 .op_func = nfsd4_commit,
2120                 .op_flags = OP_MODIFIES_SOMETHING,
2121                 .op_name = "OP_COMMIT",
2122                 .op_rsize_bop = nfsd4_commit_rsize,
2123         },
2124         [OP_CREATE] = {
2125                 .op_func = nfsd4_create,
2126                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2127                 .op_name = "OP_CREATE",
2128                 .op_rsize_bop = nfsd4_create_rsize,
2129         },
2130         [OP_DELEGRETURN] = {
2131                 .op_func = nfsd4_delegreturn,
2132                 .op_flags = OP_MODIFIES_SOMETHING,
2133                 .op_name = "OP_DELEGRETURN",
2134                 .op_rsize_bop = nfsd4_only_status_rsize,
2135                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2136         },
2137         [OP_GETATTR] = {
2138                 .op_func = nfsd4_getattr,
2139                 .op_flags = ALLOWED_ON_ABSENT_FS,
2140                 .op_rsize_bop = nfsd4_getattr_rsize,
2141                 .op_name = "OP_GETATTR",
2142         },
2143         [OP_GETFH] = {
2144                 .op_func = nfsd4_getfh,
2145                 .op_name = "OP_GETFH",
2146                 .op_rsize_bop = nfsd4_getfh_rsize,
2147         },
2148         [OP_LINK] = {
2149                 .op_func = nfsd4_link,
2150                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2151                                 | OP_CACHEME,
2152                 .op_name = "OP_LINK",
2153                 .op_rsize_bop = nfsd4_link_rsize,
2154         },
2155         [OP_LOCK] = {
2156                 .op_func = nfsd4_lock,
2157                 .op_flags = OP_MODIFIES_SOMETHING |
2158                                 OP_NONTRIVIAL_ERROR_ENCODE,
2159                 .op_name = "OP_LOCK",
2160                 .op_rsize_bop = nfsd4_lock_rsize,
2161                 .op_set_currentstateid = nfsd4_set_lockstateid,
2162         },
2163         [OP_LOCKT] = {
2164                 .op_func = nfsd4_lockt,
2165                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2166                 .op_name = "OP_LOCKT",
2167                 .op_rsize_bop = nfsd4_lock_rsize,
2168         },
2169         [OP_LOCKU] = {
2170                 .op_func = nfsd4_locku,
2171                 .op_flags = OP_MODIFIES_SOMETHING,
2172                 .op_name = "OP_LOCKU",
2173                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2174                 .op_get_currentstateid = nfsd4_get_lockustateid,
2175         },
2176         [OP_LOOKUP] = {
2177                 .op_func = nfsd4_lookup,
2178                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2179                 .op_name = "OP_LOOKUP",
2180                 .op_rsize_bop = nfsd4_only_status_rsize,
2181         },
2182         [OP_LOOKUPP] = {
2183                 .op_func = nfsd4_lookupp,
2184                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2185                 .op_name = "OP_LOOKUPP",
2186                 .op_rsize_bop = nfsd4_only_status_rsize,
2187         },
2188         [OP_NVERIFY] = {
2189                 .op_func = nfsd4_nverify,
2190                 .op_name = "OP_NVERIFY",
2191                 .op_rsize_bop = nfsd4_only_status_rsize,
2192         },
2193         [OP_OPEN] = {
2194                 .op_func = nfsd4_open,
2195                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2196                 .op_name = "OP_OPEN",
2197                 .op_rsize_bop = nfsd4_open_rsize,
2198                 .op_set_currentstateid = nfsd4_set_openstateid,
2199         },
2200         [OP_OPEN_CONFIRM] = {
2201                 .op_func = nfsd4_open_confirm,
2202                 .op_flags = OP_MODIFIES_SOMETHING,
2203                 .op_name = "OP_OPEN_CONFIRM",
2204                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2205         },
2206         [OP_OPEN_DOWNGRADE] = {
2207                 .op_func = nfsd4_open_downgrade,
2208                 .op_flags = OP_MODIFIES_SOMETHING,
2209                 .op_name = "OP_OPEN_DOWNGRADE",
2210                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2211                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2212                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2213         },
2214         [OP_PUTFH] = {
2215                 .op_func = nfsd4_putfh,
2216                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2217                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2218                 .op_name = "OP_PUTFH",
2219                 .op_rsize_bop = nfsd4_only_status_rsize,
2220         },
2221         [OP_PUTPUBFH] = {
2222                 .op_func = nfsd4_putrootfh,
2223                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2224                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2225                 .op_name = "OP_PUTPUBFH",
2226                 .op_rsize_bop = nfsd4_only_status_rsize,
2227         },
2228         [OP_PUTROOTFH] = {
2229                 .op_func = nfsd4_putrootfh,
2230                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2231                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2232                 .op_name = "OP_PUTROOTFH",
2233                 .op_rsize_bop = nfsd4_only_status_rsize,
2234         },
2235         [OP_READ] = {
2236                 .op_func = nfsd4_read,
2237                 .op_release = nfsd4_read_release,
2238                 .op_name = "OP_READ",
2239                 .op_rsize_bop = nfsd4_read_rsize,
2240                 .op_get_currentstateid = nfsd4_get_readstateid,
2241         },
2242         [OP_READDIR] = {
2243                 .op_func = nfsd4_readdir,
2244                 .op_name = "OP_READDIR",
2245                 .op_rsize_bop = nfsd4_readdir_rsize,
2246         },
2247         [OP_READLINK] = {
2248                 .op_func = nfsd4_readlink,
2249                 .op_name = "OP_READLINK",
2250                 .op_rsize_bop = nfsd4_readlink_rsize,
2251         },
2252         [OP_REMOVE] = {
2253                 .op_func = nfsd4_remove,
2254                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2255                 .op_name = "OP_REMOVE",
2256                 .op_rsize_bop = nfsd4_remove_rsize,
2257         },
2258         [OP_RENAME] = {
2259                 .op_func = nfsd4_rename,
2260                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2261                 .op_name = "OP_RENAME",
2262                 .op_rsize_bop = nfsd4_rename_rsize,
2263         },
2264         [OP_RENEW] = {
2265                 .op_func = nfsd4_renew,
2266                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2267                                 | OP_MODIFIES_SOMETHING,
2268                 .op_name = "OP_RENEW",
2269                 .op_rsize_bop = nfsd4_only_status_rsize,
2270
2271         },
2272         [OP_RESTOREFH] = {
2273                 .op_func = nfsd4_restorefh,
2274                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2275                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2276                 .op_name = "OP_RESTOREFH",
2277                 .op_rsize_bop = nfsd4_only_status_rsize,
2278         },
2279         [OP_SAVEFH] = {
2280                 .op_func = nfsd4_savefh,
2281                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2282                 .op_name = "OP_SAVEFH",
2283                 .op_rsize_bop = nfsd4_only_status_rsize,
2284         },
2285         [OP_SECINFO] = {
2286                 .op_func = nfsd4_secinfo,
2287                 .op_release = nfsd4_secinfo_release,
2288                 .op_flags = OP_HANDLES_WRONGSEC,
2289                 .op_name = "OP_SECINFO",
2290                 .op_rsize_bop = nfsd4_secinfo_rsize,
2291         },
2292         [OP_SETATTR] = {
2293                 .op_func = nfsd4_setattr,
2294                 .op_name = "OP_SETATTR",
2295                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2296                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2297                 .op_rsize_bop = nfsd4_setattr_rsize,
2298                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2299         },
2300         [OP_SETCLIENTID] = {
2301                 .op_func = nfsd4_setclientid,
2302                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2303                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2304                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2305                 .op_name = "OP_SETCLIENTID",
2306                 .op_rsize_bop = nfsd4_setclientid_rsize,
2307         },
2308         [OP_SETCLIENTID_CONFIRM] = {
2309                 .op_func = nfsd4_setclientid_confirm,
2310                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2311                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2312                 .op_name = "OP_SETCLIENTID_CONFIRM",
2313                 .op_rsize_bop = nfsd4_only_status_rsize,
2314         },
2315         [OP_VERIFY] = {
2316                 .op_func = nfsd4_verify,
2317                 .op_name = "OP_VERIFY",
2318                 .op_rsize_bop = nfsd4_only_status_rsize,
2319         },
2320         [OP_WRITE] = {
2321                 .op_func = nfsd4_write,
2322                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2323                 .op_name = "OP_WRITE",
2324                 .op_rsize_bop = nfsd4_write_rsize,
2325                 .op_get_currentstateid = nfsd4_get_writestateid,
2326         },
2327         [OP_RELEASE_LOCKOWNER] = {
2328                 .op_func = nfsd4_release_lockowner,
2329                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2330                                 | OP_MODIFIES_SOMETHING,
2331                 .op_name = "OP_RELEASE_LOCKOWNER",
2332                 .op_rsize_bop = nfsd4_only_status_rsize,
2333         },
2334
2335         /* NFSv4.1 operations */
2336         [OP_EXCHANGE_ID] = {
2337                 .op_func = nfsd4_exchange_id,
2338                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2339                                 | OP_MODIFIES_SOMETHING,
2340                 .op_name = "OP_EXCHANGE_ID",
2341                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2342         },
2343         [OP_BACKCHANNEL_CTL] = {
2344                 .op_func = nfsd4_backchannel_ctl,
2345                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2346                 .op_name = "OP_BACKCHANNEL_CTL",
2347                 .op_rsize_bop = nfsd4_only_status_rsize,
2348         },
2349         [OP_BIND_CONN_TO_SESSION] = {
2350                 .op_func = nfsd4_bind_conn_to_session,
2351                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2352                                 | OP_MODIFIES_SOMETHING,
2353                 .op_name = "OP_BIND_CONN_TO_SESSION",
2354                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2355         },
2356         [OP_CREATE_SESSION] = {
2357                 .op_func = nfsd4_create_session,
2358                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2359                                 | OP_MODIFIES_SOMETHING,
2360                 .op_name = "OP_CREATE_SESSION",
2361                 .op_rsize_bop = nfsd4_create_session_rsize,
2362         },
2363         [OP_DESTROY_SESSION] = {
2364                 .op_func = nfsd4_destroy_session,
2365                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2366                                 | OP_MODIFIES_SOMETHING,
2367                 .op_name = "OP_DESTROY_SESSION",
2368                 .op_rsize_bop = nfsd4_only_status_rsize,
2369         },
2370         [OP_SEQUENCE] = {
2371                 .op_func = nfsd4_sequence,
2372                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2373                 .op_name = "OP_SEQUENCE",
2374                 .op_rsize_bop = nfsd4_sequence_rsize,
2375         },
2376         [OP_DESTROY_CLIENTID] = {
2377                 .op_func = nfsd4_destroy_clientid,
2378                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2379                                 | OP_MODIFIES_SOMETHING,
2380                 .op_name = "OP_DESTROY_CLIENTID",
2381                 .op_rsize_bop = nfsd4_only_status_rsize,
2382         },
2383         [OP_RECLAIM_COMPLETE] = {
2384                 .op_func = nfsd4_reclaim_complete,
2385                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2386                 .op_name = "OP_RECLAIM_COMPLETE",
2387                 .op_rsize_bop = nfsd4_only_status_rsize,
2388         },
2389         [OP_SECINFO_NO_NAME] = {
2390                 .op_func = nfsd4_secinfo_no_name,
2391                 .op_release = nfsd4_secinfo_no_name_release,
2392                 .op_flags = OP_HANDLES_WRONGSEC,
2393                 .op_name = "OP_SECINFO_NO_NAME",
2394                 .op_rsize_bop = nfsd4_secinfo_rsize,
2395         },
2396         [OP_TEST_STATEID] = {
2397                 .op_func = nfsd4_test_stateid,
2398                 .op_flags = ALLOWED_WITHOUT_FH,
2399                 .op_name = "OP_TEST_STATEID",
2400                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2401         },
2402         [OP_FREE_STATEID] = {
2403                 .op_func = nfsd4_free_stateid,
2404                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2405                 .op_name = "OP_FREE_STATEID",
2406                 .op_get_currentstateid = nfsd4_get_freestateid,
2407                 .op_rsize_bop = nfsd4_only_status_rsize,
2408         },
2409 #ifdef CONFIG_NFSD_PNFS
2410         [OP_GETDEVICEINFO] = {
2411                 .op_func = nfsd4_getdeviceinfo,
2412                 .op_release = nfsd4_getdeviceinfo_release,
2413                 .op_flags = ALLOWED_WITHOUT_FH,
2414                 .op_name = "OP_GETDEVICEINFO",
2415                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2416         },
2417         [OP_LAYOUTGET] = {
2418                 .op_func = nfsd4_layoutget,
2419                 .op_release = nfsd4_layoutget_release,
2420                 .op_flags = OP_MODIFIES_SOMETHING,
2421                 .op_name = "OP_LAYOUTGET",
2422                 .op_rsize_bop = nfsd4_layoutget_rsize,
2423         },
2424         [OP_LAYOUTCOMMIT] = {
2425                 .op_func = nfsd4_layoutcommit,
2426                 .op_flags = OP_MODIFIES_SOMETHING,
2427                 .op_name = "OP_LAYOUTCOMMIT",
2428                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2429         },
2430         [OP_LAYOUTRETURN] = {
2431                 .op_func = nfsd4_layoutreturn,
2432                 .op_flags = OP_MODIFIES_SOMETHING,
2433                 .op_name = "OP_LAYOUTRETURN",
2434                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2435         },
2436 #endif /* CONFIG_NFSD_PNFS */
2437
2438         /* NFSv4.2 operations */
2439         [OP_ALLOCATE] = {
2440                 .op_func = nfsd4_allocate,
2441                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2442                 .op_name = "OP_ALLOCATE",
2443                 .op_rsize_bop = nfsd4_only_status_rsize,
2444         },
2445         [OP_DEALLOCATE] = {
2446                 .op_func = nfsd4_deallocate,
2447                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2448                 .op_name = "OP_DEALLOCATE",
2449                 .op_rsize_bop = nfsd4_only_status_rsize,
2450         },
2451         [OP_CLONE] = {
2452                 .op_func = nfsd4_clone,
2453                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2454                 .op_name = "OP_CLONE",
2455                 .op_rsize_bop = nfsd4_only_status_rsize,
2456         },
2457         [OP_COPY] = {
2458                 .op_func = nfsd4_copy,
2459                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2460                 .op_name = "OP_COPY",
2461                 .op_rsize_bop = nfsd4_copy_rsize,
2462         },
2463         [OP_SEEK] = {
2464                 .op_func = nfsd4_seek,
2465                 .op_name = "OP_SEEK",
2466                 .op_rsize_bop = nfsd4_seek_rsize,
2467         },
2468 };
2469
2470 /**
2471  * nfsd4_spo_must_allow - Determine if the compound op contains an
2472  * operation that is allowed to be sent with machine credentials
2473  *
2474  * @rqstp: a pointer to the struct svc_rqst
2475  *
2476  * Checks to see if the compound contains a spo_must_allow op
2477  * and confirms that it was sent with the proper machine creds.
2478  */
2479
2480 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2481 {
2482         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2483         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2484         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2485         struct nfsd4_compound_state *cstate = &resp->cstate;
2486         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2487         u32 opiter;
2488
2489         if (!cstate->minorversion)
2490                 return false;
2491
2492         if (cstate->spo_must_allowed == true)
2493                 return true;
2494
2495         opiter = resp->opcnt;
2496         while (opiter < argp->opcnt) {
2497                 this = &argp->ops[opiter++];
2498                 if (test_bit(this->opnum, allow->u.longs) &&
2499                         cstate->clp->cl_mach_cred &&
2500                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2501                         cstate->spo_must_allowed = true;
2502                         return true;
2503                 }
2504         }
2505         cstate->spo_must_allowed = false;
2506         return false;
2507 }
2508
2509 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2510 {
2511         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2512                 return op_encode_hdr_size * sizeof(__be32);
2513
2514         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2515         return OPDESC(op)->op_rsize_bop(rqstp, op);
2516 }
2517
2518 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2519 {
2520         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2521                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2522                         op->opnum, nfsd4_op_name(op->opnum));
2523                 WARN_ON_ONCE(1);
2524         }
2525 }
2526
2527 static const char *nfsd4_op_name(unsigned opnum)
2528 {
2529         if (opnum < ARRAY_SIZE(nfsd4_ops))
2530                 return nfsd4_ops[opnum].op_name;
2531         return "unknown_operation";
2532 }
2533
2534 #define nfsd4_voidres                   nfsd4_voidargs
2535 struct nfsd4_voidargs { int dummy; };
2536
2537 static const struct svc_procedure nfsd_procedures4[2] = {
2538         [NFSPROC4_NULL] = {
2539                 .pc_func = nfsd4_proc_null,
2540                 .pc_encode = nfs4svc_encode_voidres,
2541                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2542                 .pc_ressize = sizeof(struct nfsd4_voidres),
2543                 .pc_cachetype = RC_NOCACHE,
2544                 .pc_xdrressize = 1,
2545         },
2546         [NFSPROC4_COMPOUND] = {
2547                 .pc_func = nfsd4_proc_compound,
2548                 .pc_decode = nfs4svc_decode_compoundargs,
2549                 .pc_encode = nfs4svc_encode_compoundres,
2550                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2551                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2552                 .pc_release = nfsd4_release_compoundargs,
2553                 .pc_cachetype = RC_NOCACHE,
2554                 .pc_xdrressize = NFSD_BUFSIZE/4,
2555         },
2556 };
2557
2558 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2559 const struct svc_version nfsd_version4 = {
2560         .vs_vers                = 4,
2561         .vs_nproc               = 2,
2562         .vs_proc                = nfsd_procedures4,
2563         .vs_count               = nfsd_count3,
2564         .vs_dispatch            = nfsd_dispatch,
2565         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2566         .vs_rpcb_optnl          = true,
2567         .vs_need_cong_ctrl      = true,
2568 };
2569
2570 /*
2571  * Local variables:
2572  *  c-basic-offset: 8
2573  * End:
2574  */