fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/falloc.h>
  37 #include <linux/slab.h>
  38
  39 #include "idmap.h"
  40 #include "cache.h"
  41 #include "xdr4.h"
  42 #include "vfs.h"
  43 #include "current_stateid.h"
  44 #include "netns.h"
  45 #include "acl.h"
  46 #include "pnfs.h"
  47 #include "trace.h"
  48
  49 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  50 #include <linux/security.h>
  51
  52 static inline void
  53 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  54 {
  55         struct inode *inode = d_inode(resfh->fh_dentry);
  56         int status;
  57
  58         inode_lock(inode);
  59         status = security_inode_setsecctx(resfh->fh_dentry,
  60                 label->data, label->len);
  61         inode_unlock(inode);
  62
  63         if (status)
  64                 /*
  65                  * XXX: We should really fail the whole open, but we may
  66                  * already have created a new file, so it may be too
  67                  * late.  For now this seems the least of evils:
  68                  */
  69                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  70
  71         return;
  72 }
  73 #else
  74 static inline void
  75 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  76 { }
  77 #endif
  78
  79 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  80
  81 static u32 nfsd_attrmask[] = {
  82         NFSD_WRITEABLE_ATTRS_WORD0,
  83         NFSD_WRITEABLE_ATTRS_WORD1,
  84         NFSD_WRITEABLE_ATTRS_WORD2
  85 };
  86
  87 static u32 nfsd41_ex_attrmask[] = {
  88         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  89         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  90         NFSD_SUPPATTR_EXCLCREAT_WORD2
  91 };
  92
  93 static __be32
  94 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  95                    u32 *bmval, u32 *writable)
  96 {
  97         struct dentry *dentry = cstate->current_fh.fh_dentry;
  98         struct svc_export *exp = cstate->current_fh.fh_export;
  99
 100         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
 101                 return nfserr_attrnotsupp;
 102         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
 103                 return nfserr_attrnotsupp;
 104         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
 105                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
 106                 return nfserr_attrnotsupp;
 107         if (writable && !bmval_is_subset(bmval, writable))
 108                 return nfserr_inval;
 109         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
 110                         (bmval[1] & FATTR4_WORD1_MODE))
 111                 return nfserr_inval;
 112         return nfs_ok;
 113 }
 114
 115 static __be32
 116 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 117         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 118 {
 119         __be32 status = nfs_ok;
 120
 121         if (open->op_create == NFS4_OPEN_CREATE) {
 122                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 123                     || open->op_createmode == NFS4_CREATE_GUARDED)
 124                         status = check_attr_support(rqstp, cstate,
 125                                         open->op_bmval, nfsd_attrmask);
 126                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 127                         status = check_attr_support(rqstp, cstate,
 128                                         open->op_bmval, nfsd41_ex_attrmask);
 129         }
 130
 131         return status;
 132 }
 133
 134 static int
 135 is_create_with_attrs(struct nfsd4_open *open)
 136 {
 137         return open->op_create == NFS4_OPEN_CREATE
 138                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 139                     || open->op_createmode == NFS4_CREATE_GUARDED
 140                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 141 }
 142
 143 /*
 144  * if error occurs when setting the acl, just clear the acl bit
 145  * in the returned attr bitmap.
 146  */
 147 static void
 148 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 149                 struct nfs4_acl *acl, u32 *bmval)
 150 {
 151         __be32 status;
 152
 153         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 154         if (status)
 155                 /*
 156                  * We should probably fail the whole open at this point,
 157                  * but we've already created the file, so it's too late;
 158                  * So this seems the least of evils:
 159                  */
 160                 bmval[0] &= ~FATTR4_WORD0_ACL;
 161 }
 162
 163 static inline void
 164 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 165 {
 166         fh_put(dst);
 167         dget(src->fh_dentry);
 168         if (src->fh_export)
 169                 exp_get(src->fh_export);
 170         *dst = *src;
 171 }
 172
 173 static __be32
 174 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 175 {
 176         __be32 status;
 177
 178         if (open->op_truncate &&
 179                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 180                 return nfserr_inval;
 181
 182         accmode |= NFSD_MAY_READ_IF_EXEC;
 183
 184         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 185                 accmode |= NFSD_MAY_READ;
 186         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 187                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 188         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 189                 accmode |= NFSD_MAY_WRITE;
 190
 191         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 192
 193         return status;
 194 }
 195
 196 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 197 {
 198         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 199
 200         if (S_ISREG(mode))
 201                 return nfs_ok;
 202         if (S_ISDIR(mode))
 203                 return nfserr_isdir;
 204         /*
 205          * Using err_symlink as our catch-all case may look odd; but
 206          * there's no other obvious error for this case in 4.0, and we
 207          * happen to know that it will cause the linux v4 client to do
 208          * the right thing on attempts to open something other than a
 209          * regular file.
 210          */
 211         return nfserr_symlink;
 212 }
 213
 214 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 215 {
 216         if (nfsd4_has_session(cstate))
 217                 return;
 218         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 219                         &resfh->fh_handle);
 220 }
 221
 222 static __be32
 223 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 224 {
 225         struct svc_fh *current_fh = &cstate->current_fh;
 226         int accmode;
 227         __be32 status;
 228
 229         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 230         if (!*resfh)
 231                 return nfserr_jukebox;
 232         fh_init(*resfh, NFS4_FHSIZE);
 233         open->op_truncate = 0;
 234
 235         if (open->op_create) {
 236                 /* FIXME: check session persistence and pnfs flags.
 237                  * The nfsv4.1 spec requires the following semantics:
 238                  *
 239                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 240                  * Reply Cache  | server |                 |
 241                  * -------------+--------+-----------------+--------------------
 242                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 243                  *              |        |                 | (SHOULD)
 244                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 245                  *              |        |                 | (SHOULD NOT)
 246                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 247                  * yes          | no     | GUARDED4        | GUARDED4
 248                  * yes          | yes    | GUARDED4        | GUARDED4
 249                  */
 250
 251                 /*
 252                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 253                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 254                  */
 255                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 256                                         open->op_fname.len, &open->op_iattr,
 257                                         *resfh, open->op_createmode,
 258                                         (u32 *)open->op_verf.data,
 259                                         &open->op_truncate, &open->op_created);
 260
 261                 if (!status && open->op_label.len)
 262                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 263
 264                 /*
 265                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 266                  * use the returned bitmask to indicate which attributes
 267                  * we used to store the verifier:
 268                  */
 269                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 270                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 271                                                 FATTR4_WORD1_TIME_MODIFY);
 272         } else
 273                 /*
 274                  * Note this may exit with the parent still locked.
 275                  * We will hold the lock until nfsd4_open's final
 276                  * lookup, to prevent renames or unlinks until we've had
 277                  * a chance to an acquire a delegation if appropriate.
 278                  */
 279                 status = nfsd_lookup(rqstp, current_fh,
 280                                      open->op_fname.data, open->op_fname.len, *resfh);
 281         if (status)
 282                 goto out;
 283         status = nfsd_check_obj_isreg(*resfh);
 284         if (status)
 285                 goto out;
 286
 287         if (is_create_with_attrs(open) && open->op_acl != NULL)
 288                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 289
 290         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 291         accmode = NFSD_MAY_NOP;
 292         if (open->op_created ||
 293                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 294                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 295         status = do_open_permission(rqstp, *resfh, open, accmode);
 296         set_change_info(&open->op_cinfo, current_fh);
 297 out:
 298         return status;
 299 }
 300
 301 static __be32
 302 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 303 {
 304         struct svc_fh *current_fh = &cstate->current_fh;
 305         __be32 status;
 306         int accmode = 0;
 307
 308         /* We don't know the target directory, and therefore can not
 309         * set the change info
 310         */
 311
 312         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 313
 314         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 315
 316         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 317                 (open->op_iattr.ia_size == 0);
 318         /*
 319          * In the delegation case, the client is telling us about an
 320          * open that it *already* performed locally, some time ago.  We
 321          * should let it succeed now if possible.
 322          *
 323          * In the case of a CLAIM_FH open, on the other hand, the client
 324          * may be counting on us to enforce permissions (the Linux 4.1
 325          * client uses this for normal opens, for example).
 326          */
 327         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 328                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 329
 330         status = do_open_permission(rqstp, current_fh, open, accmode);
 331
 332         return status;
 333 }
 334
 335 static void
 336 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 337 {
 338         struct nfsd4_sessionid *sid =
 339                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 340
 341         clid->cl_boot = sid->clientid.cl_boot;
 342         clid->cl_id = sid->clientid.cl_id;
 343 }
 344
 345 static __be32
 346 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 347            union nfsd4_op_u *u)
 348 {
 349         struct nfsd4_open *open = &u->open;
 350         __be32 status;
 351         struct svc_fh *resfh = NULL;
 352         struct net *net = SVC_NET(rqstp);
 353         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 354
 355         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 356                 (int)open->op_fname.len, open->op_fname.data,
 357                 open->op_openowner);
 358
 359         /* This check required by spec. */
 360         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 361                 return nfserr_inval;
 362
 363         open->op_created = 0;
 364         /*
 365          * RFC5661 18.51.3
 366          * Before RECLAIM_COMPLETE done, server should deny new lock
 367          */
 368         if (nfsd4_has_session(cstate) &&
 369             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 370                       &cstate->session->se_client->cl_flags) &&
 371             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 372                 return nfserr_grace;
 373
 374         if (nfsd4_has_session(cstate))
 375                 copy_clientid(&open->op_clientid, cstate->session);
 376
 377         /* check seqid for replay. set nfs4_owner */
 378         status = nfsd4_process_open1(cstate, open, nn);
 379         if (status == nfserr_replay_me) {
 380                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 381                 fh_put(&cstate->current_fh);
 382                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 383                                 &rp->rp_openfh);
 384                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 385                 if (status)
 386                         dprintk("nfsd4_open: replay failed"
 387                                 " restoring previous filehandle\n");
 388                 else
 389                         status = nfserr_replay_me;
 390         }
 391         if (status)
 392                 goto out;
 393         if (open->op_xdr_error) {
 394                 status = open->op_xdr_error;
 395                 goto out;
 396         }
 397
 398         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 399         if (status)
 400                 goto out;
 401
 402         /* Openowner is now set, so sequence id will get bumped.  Now we need
 403          * these checks before we do any creates: */
 404         status = nfserr_grace;
 405         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 406                 goto out;
 407         status = nfserr_no_grace;
 408         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 409                 goto out;
 410
 411         switch (open->op_claim_type) {
 412                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 413                 case NFS4_OPEN_CLAIM_NULL:
 414                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 415                         if (status)
 416                                 goto out;
 417                         break;
 418                 case NFS4_OPEN_CLAIM_PREVIOUS:
 419                         status = nfs4_check_open_reclaim(&open->op_clientid,
 420                                                          cstate, nn);
 421                         if (status)
 422                                 goto out;
 423                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 424                 case NFS4_OPEN_CLAIM_FH:
 425                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 426                         status = do_open_fhandle(rqstp, cstate, open);
 427                         if (status)
 428                                 goto out;
 429                         resfh = &cstate->current_fh;
 430                         break;
 431                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 432                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 433                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 434                                 open->op_claim_type);
 435                         status = nfserr_notsupp;
 436                         goto out;
 437                 default:
 438                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 439                                 open->op_claim_type);
 440                         status = nfserr_inval;
 441                         goto out;
 442         }
 443         /*
 444          * nfsd4_process_open2() does the actual opening of the file.  If
 445          * successful, it (1) truncates the file if open->op_truncate was
 446          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 447          */
 448         status = nfsd4_process_open2(rqstp, resfh, open);
 449         WARN(status && open->op_created,
 450              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 451              be32_to_cpu(status));
 452 out:
 453         if (resfh && resfh != &cstate->current_fh) {
 454                 fh_dup2(&cstate->current_fh, resfh);
 455                 fh_put(resfh);
 456                 kfree(resfh);
 457         }
 458         nfsd4_cleanup_open_state(cstate, open);
 459         nfsd4_bump_seqid(cstate, status);
 460         return status;
 461 }
 462
 463 /*
 464  * OPEN is the only seqid-mutating operation whose decoding can fail
 465  * with a seqid-mutating error (specifically, decoding of user names in
 466  * the attributes).  Therefore we have to do some processing to look up
 467  * the stateowner so that we can bump the seqid.
 468  */
 469 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 470 {
 471         struct nfsd4_open *open = &op->u.open;
 472
 473         if (!seqid_mutating_err(ntohl(op->status)))
 474                 return op->status;
 475         if (nfsd4_has_session(cstate))
 476                 return op->status;
 477         open->op_xdr_error = op->status;
 478         return nfsd4_open(rqstp, cstate, &op->u);
 479 }
 480
 481 /*
 482  * filehandle-manipulating ops.
 483  */
 484 static __be32
 485 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 486             union nfsd4_op_u *u)
 487 {
 488         u->getfh = &cstate->current_fh;
 489         return nfs_ok;
 490 }
 491
 492 static __be32
 493 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 494             union nfsd4_op_u *u)
 495 {
 496         struct nfsd4_putfh *putfh = &u->putfh;
 497
 498         fh_put(&cstate->current_fh);
 499         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 500         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 501                putfh->pf_fhlen);
 502         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 503 }
 504
 505 static __be32
 506 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 507                 union nfsd4_op_u *u)
 508 {
 509         __be32 status;
 510
 511         fh_put(&cstate->current_fh);
 512         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 513         return status;
 514 }
 515
 516 static __be32
 517 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 518                 union nfsd4_op_u *u)
 519 {
 520         if (!cstate->save_fh.fh_dentry)
 521                 return nfserr_restorefh;
 522
 523         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 524         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 525                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 526                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 527         }
 528         return nfs_ok;
 529 }
 530
 531 static __be32
 532 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 533              union nfsd4_op_u *u)
 534 {
 535         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 536         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 537                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 538                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 539         }
 540         return nfs_ok;
 541 }
 542
 543 /*
 544  * misc nfsv4 ops
 545  */
 546 static __be32
 547 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 548              union nfsd4_op_u *u)
 549 {
 550         struct nfsd4_access *access = &u->access;
 551
 552         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 553                 return nfserr_inval;
 554
 555         access->ac_resp_access = access->ac_req_access;
 556         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 557                            &access->ac_supported);
 558 }
 559
 560 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 561 {
 562         __be32 verf[2];
 563         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 564
 565         /*
 566          * This is opaque to client, so no need to byte-swap. Use
 567          * __force to keep sparse happy. y2038 time_t overflow is
 568          * irrelevant in this usage.
 569          */
 570         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 571         verf[1] = (__force __be32)nn->nfssvc_boot.tv_nsec;
 572         memcpy(verifier->data, verf, sizeof(verifier->data));
 573 }
 574
 575 static __be32
 576 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 577              union nfsd4_op_u *u)
 578 {
 579         struct nfsd4_commit *commit = &u->commit;
 580
 581         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 582         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 583                              commit->co_count);
 584 }
 585
 586 static __be32
 587 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 588              union nfsd4_op_u *u)
 589 {
 590         struct nfsd4_create *create = &u->create;
 591         struct svc_fh resfh;
 592         __be32 status;
 593         dev_t rdev;
 594
 595         fh_init(&resfh, NFS4_FHSIZE);
 596
 597         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 598         if (status)
 599                 return status;
 600
 601         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 602                                     nfsd_attrmask);
 603         if (status)
 604                 return status;
 605
 606         switch (create->cr_type) {
 607         case NF4LNK:
 608                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 609                                       create->cr_name, create->cr_namelen,
 610                                       create->cr_data, &resfh);
 611                 break;
 612
 613         case NF4BLK:
 614                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 615                 if (MAJOR(rdev) != create->cr_specdata1 ||
 616                     MINOR(rdev) != create->cr_specdata2)
 617                         return nfserr_inval;
 618                 status = nfsd_create(rqstp, &cstate->current_fh,
 619                                      create->cr_name, create->cr_namelen,
 620                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 621                 break;
 622
 623         case NF4CHR:
 624                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 625                 if (MAJOR(rdev) != create->cr_specdata1 ||
 626                     MINOR(rdev) != create->cr_specdata2)
 627                         return nfserr_inval;
 628                 status = nfsd_create(rqstp, &cstate->current_fh,
 629                                      create->cr_name, create->cr_namelen,
 630                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 631                 break;
 632
 633         case NF4SOCK:
 634                 status = nfsd_create(rqstp, &cstate->current_fh,
 635                                      create->cr_name, create->cr_namelen,
 636                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 637                 break;
 638
 639         case NF4FIFO:
 640                 status = nfsd_create(rqstp, &cstate->current_fh,
 641                                      create->cr_name, create->cr_namelen,
 642                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 643                 break;
 644
 645         case NF4DIR:
 646                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 647                 status = nfsd_create(rqstp, &cstate->current_fh,
 648                                      create->cr_name, create->cr_namelen,
 649                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 650                 break;
 651
 652         default:
 653                 status = nfserr_badtype;
 654         }
 655
 656         if (status)
 657                 goto out;
 658
 659         if (create->cr_label.len)
 660                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 661
 662         if (create->cr_acl != NULL)
 663                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 664                                 create->cr_bmval);
 665
 666         fh_unlock(&cstate->current_fh);
 667         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 668         fh_dup2(&cstate->current_fh, &resfh);
 669 out:
 670         fh_put(&resfh);
 671         return status;
 672 }
 673
 674 static __be32
 675 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 676               union nfsd4_op_u *u)
 677 {
 678         struct nfsd4_getattr *getattr = &u->getattr;
 679         __be32 status;
 680
 681         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 682         if (status)
 683                 return status;
 684
 685         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 686                 return nfserr_inval;
 687
 688         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 689         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 690         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 691
 692         getattr->ga_fhp = &cstate->current_fh;
 693         return nfs_ok;
 694 }
 695
 696 static __be32
 697 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 698            union nfsd4_op_u *u)
 699 {
 700         struct nfsd4_link *link = &u->link;
 701         __be32 status;
 702
 703         status = nfsd_link(rqstp, &cstate->current_fh,
 704                            link->li_name, link->li_namelen, &cstate->save_fh);
 705         if (!status)
 706                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 707         return status;
 708 }
 709
 710 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 711 {
 712         struct svc_fh tmp_fh;
 713         __be32 ret;
 714
 715         fh_init(&tmp_fh, NFS4_FHSIZE);
 716         ret = exp_pseudoroot(rqstp, &tmp_fh);
 717         if (ret)
 718                 return ret;
 719         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 720                 fh_put(&tmp_fh);
 721                 return nfserr_noent;
 722         }
 723         fh_put(&tmp_fh);
 724         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 725 }
 726
 727 static __be32
 728 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 729               union nfsd4_op_u *u)
 730 {
 731         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 732 }
 733
 734 static __be32
 735 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 736              union nfsd4_op_u *u)
 737 {
 738         return nfsd_lookup(rqstp, &cstate->current_fh,
 739                            u->lookup.lo_name, u->lookup.lo_len,
 740                            &cstate->current_fh);
 741 }
 742
 743 static __be32
 744 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 745            union nfsd4_op_u *u)
 746 {
 747         struct nfsd4_read *read = &u->read;
 748         __be32 status;
 749
 750         read->rd_filp = NULL;
 751         if (read->rd_offset >= OFFSET_MAX)
 752                 return nfserr_inval;
 753
 754         /*
 755          * If we do a zero copy read, then a client will see read data
 756          * that reflects the state of the file *after* performing the
 757          * following compound.
 758          *
 759          * To ensure proper ordering, we therefore turn off zero copy if
 760          * the client wants us to do more in this compound:
 761          */
 762         if (!nfsd4_last_compound_op(rqstp))
 763                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 764
 765         /* check stateid */
 766         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 767                                         &read->rd_stateid, RD_STATE,
 768                                         &read->rd_filp, &read->rd_tmp_file);
 769         if (status) {
 770                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 771                 goto out;
 772         }
 773         status = nfs_ok;
 774 out:
 775         read->rd_rqstp = rqstp;
 776         read->rd_fhp = &cstate->current_fh;
 777         return status;
 778 }
 779
 780
 781 static void
 782 nfsd4_read_release(union nfsd4_op_u *u)
 783 {
 784         if (u->read.rd_filp)
 785                 fput(u->read.rd_filp);
 786 }
 787
 788 static __be32
 789 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 790               union nfsd4_op_u *u)
 791 {
 792         struct nfsd4_readdir *readdir = &u->readdir;
 793         u64 cookie = readdir->rd_cookie;
 794         static const nfs4_verifier zeroverf;
 795
 796         /* no need to check permission - this will be done in nfsd_readdir() */
 797
 798         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 799                 return nfserr_inval;
 800
 801         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 802         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 803         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 804
 805         if ((cookie == 1) || (cookie == 2) ||
 806             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 807                 return nfserr_bad_cookie;
 808
 809         readdir->rd_rqstp = rqstp;
 810         readdir->rd_fhp = &cstate->current_fh;
 811         return nfs_ok;
 812 }
 813
 814 static __be32
 815 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 816                union nfsd4_op_u *u)
 817 {
 818         u->readlink.rl_rqstp = rqstp;
 819         u->readlink.rl_fhp = &cstate->current_fh;
 820         return nfs_ok;
 821 }
 822
 823 static __be32
 824 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 825              union nfsd4_op_u *u)
 826 {
 827         struct nfsd4_remove *remove = &u->remove;
 828         __be32 status;
 829
 830         if (opens_in_grace(SVC_NET(rqstp)))
 831                 return nfserr_grace;
 832         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 833                              remove->rm_name, remove->rm_namelen);
 834         if (!status) {
 835                 fh_unlock(&cstate->current_fh);
 836                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 837         }
 838         return status;
 839 }
 840
 841 static __be32
 842 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 843              union nfsd4_op_u *u)
 844 {
 845         struct nfsd4_rename *rename = &u->rename;
 846         __be32 status;
 847
 848         if (opens_in_grace(SVC_NET(rqstp)) &&
 849                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 850                 return nfserr_grace;
 851         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 852                              rename->rn_snamelen, &cstate->current_fh,
 853                              rename->rn_tname, rename->rn_tnamelen);
 854         if (status)
 855                 return status;
 856         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 857         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 858         return nfs_ok;
 859 }
 860
 861 static __be32
 862 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 863               union nfsd4_op_u *u)
 864 {
 865         struct nfsd4_secinfo *secinfo = &u->secinfo;
 866         struct svc_export *exp;
 867         struct dentry *dentry;
 868         __be32 err;
 869
 870         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 871         if (err)
 872                 return err;
 873         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 874                                     secinfo->si_name, secinfo->si_namelen,
 875                                     &exp, &dentry);
 876         if (err)
 877                 return err;
 878         fh_unlock(&cstate->current_fh);
 879         if (d_really_is_negative(dentry)) {
 880                 exp_put(exp);
 881                 err = nfserr_noent;
 882         } else
 883                 secinfo->si_exp = exp;
 884         dput(dentry);
 885         if (cstate->minorversion)
 886                 /* See rfc 5661 section 2.6.3.1.1.8 */
 887                 fh_put(&cstate->current_fh);
 888         return err;
 889 }
 890
 891 static __be32
 892 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 893                 union nfsd4_op_u *u)
 894 {
 895         __be32 err;
 896
 897         switch (u->secinfo_no_name.sin_style) {
 898         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 899                 break;
 900         case NFS4_SECINFO_STYLE4_PARENT:
 901                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 902                 if (err)
 903                         return err;
 904                 break;
 905         default:
 906                 return nfserr_inval;
 907         }
 908
 909         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 910         fh_put(&cstate->current_fh);
 911         return nfs_ok;
 912 }
 913
 914 static void
 915 nfsd4_secinfo_release(union nfsd4_op_u *u)
 916 {
 917         if (u->secinfo.si_exp)
 918                 exp_put(u->secinfo.si_exp);
 919 }
 920
 921 static void
 922 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
 923 {
 924         if (u->secinfo_no_name.sin_exp)
 925                 exp_put(u->secinfo_no_name.sin_exp);
 926 }
 927
 928 static __be32
 929 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 930               union nfsd4_op_u *u)
 931 {
 932         struct nfsd4_setattr *setattr = &u->setattr;
 933         __be32 status = nfs_ok;
 934         int err;
 935
 936         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 937                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 938                                 &cstate->current_fh, &setattr->sa_stateid,
 939                                 WR_STATE, NULL, NULL);
 940                 if (status) {
 941                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 942                         return status;
 943                 }
 944         }
 945         err = fh_want_write(&cstate->current_fh);
 946         if (err)
 947                 return nfserrno(err);
 948         status = nfs_ok;
 949
 950         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 951                                     nfsd_attrmask);
 952         if (status)
 953                 goto out;
 954
 955         if (setattr->sa_acl != NULL)
 956                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 957                                             setattr->sa_acl);
 958         if (status)
 959                 goto out;
 960         if (setattr->sa_label.len)
 961                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 962                                 &setattr->sa_label);
 963         if (status)
 964                 goto out;
 965         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 966                                 0, (time_t)0);
 967 out:
 968         fh_drop_write(&cstate->current_fh);
 969         return status;
 970 }
 971
 972 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 973 {
 974         int i = 1;
 975         int buflen = write->wr_buflen;
 976
 977         vec[0].iov_base = write->wr_head.iov_base;
 978         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 979         buflen -= vec[0].iov_len;
 980
 981         while (buflen) {
 982                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 983                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 984                 buflen -= vec[i].iov_len;
 985                 i++;
 986         }
 987         return i;
 988 }
 989
 990 static __be32
 991 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 992             union nfsd4_op_u *u)
 993 {
 994         struct nfsd4_write *write = &u->write;
 995         stateid_t *stateid = &write->wr_stateid;
 996         struct file *filp = NULL;
 997         __be32 status = nfs_ok;
 998         unsigned long cnt;
 999         int nvecs;
1000
1001         if (write->wr_offset >= OFFSET_MAX)
1002                 return nfserr_inval;
1003
1004         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1005                                                 stateid, WR_STATE, &filp, NULL);
1006         if (status) {
1007                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1008                 return status;
1009         }
1010
1011         cnt = write->wr_buflen;
1012         write->wr_how_written = write->wr_stable_how;
1013         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1014
1015         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1016         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1017
1018         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1019                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1020                                 write->wr_how_written);
1021         fput(filp);
1022
1023         write->wr_bytes_written = cnt;
1024
1025         return status;
1026 }
1027
1028 static __be32
1029 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1030                   stateid_t *src_stateid, struct file **src,
1031                   stateid_t *dst_stateid, struct file **dst)
1032 {
1033         __be32 status;
1034
1035         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1036                                             src_stateid, RD_STATE, src, NULL);
1037         if (status) {
1038                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1039                 goto out;
1040         }
1041
1042         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1043                                             dst_stateid, WR_STATE, dst, NULL);
1044         if (status) {
1045                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1046                 goto out_put_src;
1047         }
1048
1049         /* fix up for NFS-specific error code */
1050         if (!S_ISREG(file_inode(*src)->i_mode) ||
1051             !S_ISREG(file_inode(*dst)->i_mode)) {
1052                 status = nfserr_wrong_type;
1053                 goto out_put_dst;
1054         }
1055
1056 out:
1057         return status;
1058 out_put_dst:
1059         fput(*dst);
1060 out_put_src:
1061         fput(*src);
1062         goto out;
1063 }
1064
1065 static __be32
1066 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1067                 union nfsd4_op_u *u)
1068 {
1069         struct nfsd4_clone *clone = &u->clone;
1070         struct file *src, *dst;
1071         __be32 status;
1072
1073         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1074                                    &clone->cl_dst_stateid, &dst);
1075         if (status)
1076                 goto out;
1077
1078         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1079                         dst, clone->cl_dst_pos, clone->cl_count);
1080
1081         fput(dst);
1082         fput(src);
1083 out:
1084         return status;
1085 }
1086
1087 static __be32
1088 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1089                 union nfsd4_op_u *u)
1090 {
1091         struct nfsd4_copy *copy = &u->copy;
1092         struct file *src, *dst;
1093         __be32 status;
1094         ssize_t bytes;
1095
1096         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1097                                    &copy->cp_dst_stateid, &dst);
1098         if (status)
1099                 goto out;
1100
1101         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1102                         dst, copy->cp_dst_pos, copy->cp_count);
1103
1104         if (bytes < 0)
1105                 status = nfserrno(bytes);
1106         else {
1107                 copy->cp_res.wr_bytes_written = bytes;
1108                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1109                 copy->cp_consecutive = 1;
1110                 copy->cp_synchronous = 1;
1111                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1112                 status = nfs_ok;
1113         }
1114
1115         fput(src);
1116         fput(dst);
1117 out:
1118         return status;
1119 }
1120
1121 static __be32
1122 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1123                 struct nfsd4_fallocate *fallocate, int flags)
1124 {
1125         __be32 status = nfserr_notsupp;
1126         struct file *file;
1127
1128         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1129                                             &fallocate->falloc_stateid,
1130                                             WR_STATE, &file, NULL);
1131         if (status != nfs_ok) {
1132                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1133                 return status;
1134         }
1135
1136         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1137                                      fallocate->falloc_offset,
1138                                      fallocate->falloc_length,
1139                                      flags);
1140         fput(file);
1141         return status;
1142 }
1143
1144 static __be32
1145 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1146                union nfsd4_op_u *u)
1147 {
1148         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1149 }
1150
1151 static __be32
1152 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1153                  union nfsd4_op_u *u)
1154 {
1155         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1156                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1157 }
1158
1159 static __be32
1160 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1161            union nfsd4_op_u *u)
1162 {
1163         struct nfsd4_seek *seek = &u->seek;
1164         int whence;
1165         __be32 status;
1166         struct file *file;
1167
1168         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1169                                             &seek->seek_stateid,
1170                                             RD_STATE, &file, NULL);
1171         if (status) {
1172                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1173                 return status;
1174         }
1175
1176         switch (seek->seek_whence) {
1177         case NFS4_CONTENT_DATA:
1178                 whence = SEEK_DATA;
1179                 break;
1180         case NFS4_CONTENT_HOLE:
1181                 whence = SEEK_HOLE;
1182                 break;
1183         default:
1184                 status = nfserr_union_notsupp;
1185                 goto out;
1186         }
1187
1188         /*
1189          * Note:  This call does change file->f_pos, but nothing in NFSD
1190          *        should ever file->f_pos.
1191          */
1192         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1193         if (seek->seek_pos < 0)
1194                 status = nfserrno(seek->seek_pos);
1195         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1196                 seek->seek_eof = true;
1197
1198 out:
1199         fput(file);
1200         return status;
1201 }
1202
1203 /* This routine never returns NFS_OK!  If there are no other errors, it
1204  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1205  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1206  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1207  */
1208 static __be32
1209 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1210              struct nfsd4_verify *verify)
1211 {
1212         __be32 *buf, *p;
1213         int count;
1214         __be32 status;
1215
1216         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1217         if (status)
1218                 return status;
1219
1220         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1221         if (status)
1222                 return status;
1223
1224         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1225             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1226                 return nfserr_inval;
1227         if (verify->ve_attrlen & 3)
1228                 return nfserr_inval;
1229
1230         /* count in words:
1231          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1232          */
1233         count = 4 + (verify->ve_attrlen >> 2);
1234         buf = kmalloc(count << 2, GFP_KERNEL);
1235         if (!buf)
1236                 return nfserr_jukebox;
1237
1238         p = buf;
1239         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1240                                     cstate->current_fh.fh_export,
1241                                     cstate->current_fh.fh_dentry,
1242                                     verify->ve_bmval,
1243                                     rqstp, 0);
1244         /*
1245          * If nfsd4_encode_fattr() ran out of space, assume that's because
1246          * the attributes are longer (hence different) than those given:
1247          */
1248         if (status == nfserr_resource)
1249                 status = nfserr_not_same;
1250         if (status)
1251                 goto out_kfree;
1252
1253         /* skip bitmap */
1254         p = buf + 1 + ntohl(buf[0]);
1255         status = nfserr_not_same;
1256         if (ntohl(*p++) != verify->ve_attrlen)
1257                 goto out_kfree;
1258         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1259                 status = nfserr_same;
1260
1261 out_kfree:
1262         kfree(buf);
1263         return status;
1264 }
1265
1266 static __be32
1267 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1268               union nfsd4_op_u *u)
1269 {
1270         __be32 status;
1271
1272         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1273         return status == nfserr_not_same ? nfs_ok : status;
1274 }
1275
1276 static __be32
1277 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1278              union nfsd4_op_u *u)
1279 {
1280         __be32 status;
1281
1282         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1283         return status == nfserr_same ? nfs_ok : status;
1284 }
1285
1286 #ifdef CONFIG_NFSD_PNFS
1287 static const struct nfsd4_layout_ops *
1288 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1289 {
1290         if (!exp->ex_layout_types) {
1291                 dprintk("%s: export does not support pNFS\n", __func__);
1292                 return NULL;
1293         }
1294
1295         if (layout_type >= LAYOUT_TYPE_MAX ||
1296             !(exp->ex_layout_types & (1 << layout_type))) {
1297                 dprintk("%s: layout type %d not supported\n",
1298                         __func__, layout_type);
1299                 return NULL;
1300         }
1301
1302         return nfsd4_layout_ops[layout_type];
1303 }
1304
1305 static __be32
1306 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1307                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1308 {
1309         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1310         const struct nfsd4_layout_ops *ops;
1311         struct nfsd4_deviceid_map *map;
1312         struct svc_export *exp;
1313         __be32 nfserr;
1314
1315         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1316                __func__,
1317                gdp->gd_layout_type,
1318                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1319                gdp->gd_maxcount);
1320
1321         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1322         if (!map) {
1323                 dprintk("%s: couldn't find device ID to export mapping!\n",
1324                         __func__);
1325                 return nfserr_noent;
1326         }
1327
1328         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1329         if (IS_ERR(exp)) {
1330                 dprintk("%s: could not find device id\n", __func__);
1331                 return nfserr_noent;
1332         }
1333
1334         nfserr = nfserr_layoutunavailable;
1335         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1336         if (!ops)
1337                 goto out;
1338
1339         nfserr = nfs_ok;
1340         if (gdp->gd_maxcount != 0) {
1341                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1342                                 rqstp, cstate->session->se_client, gdp);
1343         }
1344
1345         gdp->gd_notify_types &= ops->notify_types;
1346 out:
1347         exp_put(exp);
1348         return nfserr;
1349 }
1350
1351 static void
1352 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1353 {
1354         kfree(u->getdeviceinfo.gd_device);
1355 }
1356
1357 static __be32
1358 nfsd4_layoutget(struct svc_rqst *rqstp,
1359                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1360 {
1361         struct nfsd4_layoutget *lgp = &u->layoutget;
1362         struct svc_fh *current_fh = &cstate->current_fh;
1363         const struct nfsd4_layout_ops *ops;
1364         struct nfs4_layout_stateid *ls;
1365         __be32 nfserr;
1366         int accmode;
1367
1368         switch (lgp->lg_seg.iomode) {
1369         case IOMODE_READ:
1370                 accmode = NFSD_MAY_READ;
1371                 break;
1372         case IOMODE_RW:
1373                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1374                 break;
1375         default:
1376                 dprintk("%s: invalid iomode %d\n",
1377                         __func__, lgp->lg_seg.iomode);
1378                 nfserr = nfserr_badiomode;
1379                 goto out;
1380         }
1381
1382         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1383         if (nfserr)
1384                 goto out;
1385
1386         nfserr = nfserr_layoutunavailable;
1387         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1388         if (!ops)
1389                 goto out;
1390
1391         /*
1392          * Verify minlength and range as per RFC5661:
1393          *  o  If loga_length is less than loga_minlength,
1394          *     the metadata server MUST return NFS4ERR_INVAL.
1395          *  o  If the sum of loga_offset and loga_minlength exceeds
1396          *     NFS4_UINT64_MAX, and loga_minlength is not
1397          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1398          *  o  If the sum of loga_offset and loga_length exceeds
1399          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1400          *     the error NFS4ERR_INVAL MUST result.
1401          */
1402         nfserr = nfserr_inval;
1403         if (lgp->lg_seg.length < lgp->lg_minlength ||
1404             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1405              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1406             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1407              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1408                 goto out;
1409         if (lgp->lg_seg.length == 0)
1410                 goto out;
1411
1412         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1413                                                 true, lgp->lg_layout_type, &ls);
1414         if (nfserr) {
1415                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1416                 goto out;
1417         }
1418
1419         nfserr = nfserr_recallconflict;
1420         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1421                 goto out_put_stid;
1422
1423         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1424                                      current_fh, lgp);
1425         if (nfserr)
1426                 goto out_put_stid;
1427
1428         nfserr = nfsd4_insert_layout(lgp, ls);
1429
1430 out_put_stid:
1431         mutex_unlock(&ls->ls_mutex);
1432         nfs4_put_stid(&ls->ls_stid);
1433 out:
1434         return nfserr;
1435 }
1436
1437 static void
1438 nfsd4_layoutget_release(union nfsd4_op_u *u)
1439 {
1440         kfree(u->layoutget.lg_content);
1441 }
1442
1443 static __be32
1444 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1445                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1446 {
1447         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1448         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1449         struct svc_fh *current_fh = &cstate->current_fh;
1450         const struct nfsd4_layout_ops *ops;
1451         loff_t new_size = lcp->lc_last_wr + 1;
1452         struct inode *inode;
1453         struct nfs4_layout_stateid *ls;
1454         __be32 nfserr;
1455
1456         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1457         if (nfserr)
1458                 goto out;
1459
1460         nfserr = nfserr_layoutunavailable;
1461         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1462         if (!ops)
1463                 goto out;
1464         inode = d_inode(current_fh->fh_dentry);
1465
1466         nfserr = nfserr_inval;
1467         if (new_size <= seg->offset) {
1468                 dprintk("pnfsd: last write before layout segment\n");
1469                 goto out;
1470         }
1471         if (new_size > seg->offset + seg->length) {
1472                 dprintk("pnfsd: last write beyond layout segment\n");
1473                 goto out;
1474         }
1475         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1476                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1477                 goto out;
1478         }
1479
1480         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1481                                                 false, lcp->lc_layout_type,
1482                                                 &ls);
1483         if (nfserr) {
1484                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1485                 /* fixup error code as per RFC5661 */
1486                 if (nfserr == nfserr_bad_stateid)
1487                         nfserr = nfserr_badlayout;
1488                 goto out;
1489         }
1490
1491         /* LAYOUTCOMMIT does not require any serialization */
1492         mutex_unlock(&ls->ls_mutex);
1493
1494         if (new_size > i_size_read(inode)) {
1495                 lcp->lc_size_chg = 1;
1496                 lcp->lc_newsize = new_size;
1497         } else {
1498                 lcp->lc_size_chg = 0;
1499         }
1500
1501         nfserr = ops->proc_layoutcommit(inode, lcp);
1502         nfs4_put_stid(&ls->ls_stid);
1503 out:
1504         return nfserr;
1505 }
1506
1507 static __be32
1508 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1509                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1510 {
1511         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1512         struct svc_fh *current_fh = &cstate->current_fh;
1513         __be32 nfserr;
1514
1515         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1516         if (nfserr)
1517                 goto out;
1518
1519         nfserr = nfserr_layoutunavailable;
1520         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1521                 goto out;
1522
1523         switch (lrp->lr_seg.iomode) {
1524         case IOMODE_READ:
1525         case IOMODE_RW:
1526         case IOMODE_ANY:
1527                 break;
1528         default:
1529                 dprintk("%s: invalid iomode %d\n", __func__,
1530                         lrp->lr_seg.iomode);
1531                 nfserr = nfserr_inval;
1532                 goto out;
1533         }
1534
1535         switch (lrp->lr_return_type) {
1536         case RETURN_FILE:
1537                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1538                 break;
1539         case RETURN_FSID:
1540         case RETURN_ALL:
1541                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1542                 break;
1543         default:
1544                 dprintk("%s: invalid return_type %d\n", __func__,
1545                         lrp->lr_return_type);
1546                 nfserr = nfserr_inval;
1547                 break;
1548         }
1549 out:
1550         return nfserr;
1551 }
1552 #endif /* CONFIG_NFSD_PNFS */
1553
1554 /*
1555  * NULL call.
1556  */
1557 static __be32
1558 nfsd4_proc_null(struct svc_rqst *rqstp)
1559 {
1560         return nfs_ok;
1561 }
1562
1563 static inline void nfsd4_increment_op_stats(u32 opnum)
1564 {
1565         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1566                 nfsdstats.nfs4_opcount[opnum]++;
1567 }
1568
1569 static const struct nfsd4_operation nfsd4_ops[];
1570
1571 static const char *nfsd4_op_name(unsigned opnum);
1572
1573 /*
1574  * Enforce NFSv4.1 COMPOUND ordering rules:
1575  *
1576  * Also note, enforced elsewhere:
1577  *      - SEQUENCE other than as first op results in
1578  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1579  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1580  *        (Enforced in nfsd4_bind_conn_to_session().)
1581  *      - DESTROY_SESSION must be the final operation in a compound, if
1582  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1583  *        (Enforced in nfsd4_destroy_session().)
1584  */
1585 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1586 {
1587         struct nfsd4_op *op = &args->ops[0];
1588
1589         /* These ordering requirements don't apply to NFSv4.0: */
1590         if (args->minorversion == 0)
1591                 return nfs_ok;
1592         /* This is weird, but OK, not our problem: */
1593         if (args->opcnt == 0)
1594                 return nfs_ok;
1595         if (op->status == nfserr_op_illegal)
1596                 return nfs_ok;
1597         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1598                 return nfserr_op_not_in_session;
1599         if (op->opnum == OP_SEQUENCE)
1600                 return nfs_ok;
1601         if (args->opcnt != 1)
1602                 return nfserr_not_only_op;
1603         return nfs_ok;
1604 }
1605
1606 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1607 {
1608         return &nfsd4_ops[op->opnum];
1609 }
1610
1611 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1612 {
1613         if (op->opnum == OP_ILLEGAL)
1614                 return false;
1615         return OPDESC(op)->op_flags & OP_CACHEME;
1616 }
1617
1618 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1619 {
1620         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1621         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1622         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1623         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1624         const struct nfsd4_operation *thisd = OPDESC(this);
1625         const struct nfsd4_operation *nextd;
1626
1627         /*
1628          * Most ops check wronsec on our own; only the putfh-like ops
1629          * have special rules.
1630          */
1631         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1632                 return false;
1633         /*
1634          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1635          * put-filehandle operation if we're not going to use the
1636          * result:
1637          */
1638         if (argp->opcnt == resp->opcnt)
1639                 return false;
1640         if (next->opnum == OP_ILLEGAL)
1641                 return false;
1642         nextd = OPDESC(next);
1643         /*
1644          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1645          * errors themselves as necessary; others should check for them
1646          * now:
1647          */
1648         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1649 }
1650
1651 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1652                                struct nfsd4_compoundres *resp)
1653 {
1654         struct xdr_stream *xdr = &resp->xdr;
1655         struct xdr_buf *buf = &rqstp->rq_res;
1656         struct kvec *head = buf->head;
1657
1658         xdr->buf = buf;
1659         xdr->iov = head;
1660         xdr->p   = head->iov_base + head->iov_len;
1661         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1662         /* Tail and page_len should be zero at this point: */
1663         buf->len = buf->head[0].iov_len;
1664         xdr->scratch.iov_len = 0;
1665         xdr->page_ptr = buf->pages - 1;
1666         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1667                 - rqstp->rq_auth_slack;
1668 }
1669
1670 /*
1671  * COMPOUND call.
1672  */
1673 static __be32
1674 nfsd4_proc_compound(struct svc_rqst *rqstp)
1675 {
1676         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1677         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1678         struct nfsd4_op *op;
1679         struct nfsd4_compound_state *cstate = &resp->cstate;
1680         struct svc_fh *current_fh = &cstate->current_fh;
1681         struct svc_fh *save_fh = &cstate->save_fh;
1682         __be32          status;
1683
1684         svcxdr_init_encode(rqstp, resp);
1685         resp->tagp = resp->xdr.p;
1686         /* reserve space for: taglen, tag, and opcnt */
1687         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1688         resp->taglen = args->taglen;
1689         resp->tag = args->tag;
1690         resp->rqstp = rqstp;
1691         cstate->minorversion = args->minorversion;
1692         fh_init(current_fh, NFS4_FHSIZE);
1693         fh_init(save_fh, NFS4_FHSIZE);
1694         /*
1695          * Don't use the deferral mechanism for NFSv4; compounds make it
1696          * too hard to avoid non-idempotency problems.
1697          */
1698         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1699
1700         /*
1701          * According to RFC3010, this takes precedence over all other errors.
1702          */
1703         status = nfserr_minor_vers_mismatch;
1704         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1705                 goto out;
1706
1707         status = nfs41_check_op_ordering(args);
1708         if (status) {
1709                 op = &args->ops[0];
1710                 op->status = status;
1711                 goto encode_op;
1712         }
1713
1714         while (!status && resp->opcnt < args->opcnt) {
1715                 op = &args->ops[resp->opcnt++];
1716
1717                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1718                         resp->opcnt, args->opcnt, op->opnum,
1719                         nfsd4_op_name(op->opnum));
1720                 /*
1721                  * The XDR decode routines may have pre-set op->status;
1722                  * for example, if there is a miscellaneous XDR error
1723                  * it will be set to nfserr_bad_xdr.
1724                  */
1725                 if (op->status) {
1726                         if (op->opnum == OP_OPEN)
1727                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1728                         goto encode_op;
1729                 }
1730
1731                 if (!current_fh->fh_dentry) {
1732                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1733                                 op->status = nfserr_nofilehandle;
1734                                 goto encode_op;
1735                         }
1736                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1737                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1738                         op->status = nfserr_moved;
1739                         goto encode_op;
1740                 }
1741
1742                 fh_clear_wcc(current_fh);
1743
1744                 /* If op is non-idempotent */
1745                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1746                         /*
1747                          * Don't execute this op if we couldn't encode a
1748                          * succesful reply:
1749                          */
1750                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
1751                         /*
1752                          * Plus if there's another operation, make sure
1753                          * we'll have space to at least encode an error:
1754                          */
1755                         if (resp->opcnt < args->opcnt)
1756                                 plen += COMPOUND_ERR_SLACK_SPACE;
1757                         op->status = nfsd4_check_resp_size(resp, plen);
1758                 }
1759
1760                 if (op->status)
1761                         goto encode_op;
1762
1763                 if (op->opdesc->op_get_currentstateid)
1764                         op->opdesc->op_get_currentstateid(cstate, &op->u);
1765                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
1766
1767                 /* Only from SEQUENCE */
1768                 if (cstate->status == nfserr_replay_cache) {
1769                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1770                         status = op->status;
1771                         goto out;
1772                 }
1773                 if (!op->status) {
1774                         if (op->opdesc->op_set_currentstateid)
1775                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
1776
1777                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
1778                                 clear_current_stateid(cstate);
1779
1780                         if (need_wrongsec_check(rqstp))
1781                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1782                 }
1783 encode_op:
1784                 if (op->status == nfserr_replay_me) {
1785                         op->replay = &cstate->replay_owner->so_replay;
1786                         nfsd4_encode_replay(&resp->xdr, op);
1787                         status = op->status = op->replay->rp_status;
1788                 } else {
1789                         nfsd4_encode_operation(resp, op);
1790                         status = op->status;
1791                 }
1792
1793                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1794                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1795                         be32_to_cpu(status));
1796
1797                 nfsd4_cstate_clear_replay(cstate);
1798                 nfsd4_increment_op_stats(op->opnum);
1799         }
1800
1801         cstate->status = status;
1802         fh_put(current_fh);
1803         fh_put(save_fh);
1804         BUG_ON(cstate->replay_owner);
1805 out:
1806         /* Reset deferral mechanism for RPC deferrals */
1807         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1808         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1809         return status;
1810 }
1811
1812 #define op_encode_hdr_size              (2)
1813 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1814 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1815 #define op_encode_change_info_maxsz     (5)
1816 #define nfs4_fattr_bitmap_maxsz         (4)
1817
1818 /* We'll fall back on returning no lockowner if run out of space: */
1819 #define op_encode_lockowner_maxsz       (0)
1820 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1821
1822 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1823
1824 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1825 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1826                                          op_encode_ace_maxsz)
1827
1828 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1829
1830 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1831 {
1832         return (op_encode_hdr_size) * sizeof(__be32);
1833 }
1834
1835 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1836 {
1837         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1838 }
1839
1840 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1841 {
1842         /* ac_supported, ac_resp_access */
1843         return (op_encode_hdr_size + 2)* sizeof(__be32);
1844 }
1845
1846 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1847 {
1848         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1849 }
1850
1851 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1852 {
1853         return (op_encode_hdr_size + op_encode_change_info_maxsz
1854                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1855 }
1856
1857 /*
1858  * Note since this is an idempotent operation we won't insist on failing
1859  * the op prematurely if the estimate is too large.  We may turn off splice
1860  * reads unnecessarily.
1861  */
1862 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1863                                       struct nfsd4_op *op)
1864 {
1865         u32 *bmap = op->u.getattr.ga_bmval;
1866         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1867         u32 ret = 0;
1868
1869         if (bmap0 & FATTR4_WORD0_ACL)
1870                 return svc_max_payload(rqstp);
1871         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1872                 return svc_max_payload(rqstp);
1873
1874         if (bmap1 & FATTR4_WORD1_OWNER) {
1875                 ret += IDMAP_NAMESZ + 4;
1876                 bmap1 &= ~FATTR4_WORD1_OWNER;
1877         }
1878         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1879                 ret += IDMAP_NAMESZ + 4;
1880                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1881         }
1882         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1883                 ret += NFS4_FHSIZE + 4;
1884                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1885         }
1886         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1887                 ret += NFS4_MAXLABELLEN + 12;
1888                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1889         }
1890         /*
1891          * Largest of remaining attributes are 16 bytes (e.g.,
1892          * supported_attributes)
1893          */
1894         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1895         /* bitmask, length */
1896         ret += 20;
1897         return ret;
1898 }
1899
1900 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1901 {
1902         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1903 }
1904
1905 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1906 {
1907         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1908                 * sizeof(__be32);
1909 }
1910
1911 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1912 {
1913         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1914                 * sizeof(__be32);
1915 }
1916
1917 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1918 {
1919         return (op_encode_hdr_size + op_encode_stateid_maxsz
1920                 + op_encode_change_info_maxsz + 1
1921                 + nfs4_fattr_bitmap_maxsz
1922                 + op_encode_delegation_maxsz) * sizeof(__be32);
1923 }
1924
1925 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1926 {
1927         u32 maxcount = 0, rlen = 0;
1928
1929         maxcount = svc_max_payload(rqstp);
1930         rlen = min(op->u.read.rd_length, maxcount);
1931
1932         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1933 }
1934
1935 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1936 {
1937         u32 maxcount = 0, rlen = 0;
1938
1939         maxcount = svc_max_payload(rqstp);
1940         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1941
1942         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1943                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1944 }
1945
1946 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1947 {
1948         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1949 }
1950
1951 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1952 {
1953         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1954                 * sizeof(__be32);
1955 }
1956
1957 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1958 {
1959         return (op_encode_hdr_size + op_encode_change_info_maxsz
1960                 + op_encode_change_info_maxsz) * sizeof(__be32);
1961 }
1962
1963 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1964                                        struct nfsd4_op *op)
1965 {
1966         return (op_encode_hdr_size
1967                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1968 }
1969
1970 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1971 {
1972         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1973                 * sizeof(__be32);
1974 }
1975
1976 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1977 {
1978         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1979 }
1980
1981 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1982 {
1983         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
1984                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
1985 }
1986
1987 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1988 {
1989         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1990                                                                 sizeof(__be32);
1991 }
1992
1993 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1994 {
1995         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1996 }
1997
1998 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1999 {
2000         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2001                 1 + 1 + /* eir_flags, spr_how */\
2002                 4 + /* spo_must_enforce & _allow with bitmap */\
2003                 2 + /*eir_server_owner.so_minor_id */\
2004                 /* eir_server_owner.so_major_id<> */\
2005                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2006                 /* eir_server_scope<> */\
2007                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2008                 1 + /* eir_server_impl_id array length */\
2009                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2010 }
2011
2012 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2013 {
2014         return (op_encode_hdr_size + \
2015                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2016                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2017 }
2018
2019 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2020 {
2021         return (op_encode_hdr_size + \
2022                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2023                 2 + /* csr_sequence, csr_flags */\
2024                 op_encode_channel_attrs_maxsz + \
2025                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2026 }
2027
2028 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2029 {
2030         return (op_encode_hdr_size +
2031                 1 /* wr_callback */ +
2032                 op_encode_stateid_maxsz /* wr_callback */ +
2033                 2 /* wr_count */ +
2034                 1 /* wr_committed */ +
2035                 op_encode_verifier_maxsz +
2036                 1 /* cr_consecutive */ +
2037                 1 /* cr_synchronous */) * sizeof(__be32);
2038 }
2039
2040 #ifdef CONFIG_NFSD_PNFS
2041 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2042 {
2043         u32 maxcount = 0, rlen = 0;
2044
2045         maxcount = svc_max_payload(rqstp);
2046         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2047
2048         return (op_encode_hdr_size +
2049                 1 /* gd_layout_type*/ +
2050                 XDR_QUADLEN(rlen) +
2051                 2 /* gd_notify_types */) * sizeof(__be32);
2052 }
2053
2054 /*
2055  * At this stage we don't really know what layout driver will handle the request,
2056  * so we need to define an arbitrary upper bound here.
2057  */
2058 #define MAX_LAYOUT_SIZE         128
2059 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2060 {
2061         return (op_encode_hdr_size +
2062                 1 /* logr_return_on_close */ +
2063                 op_encode_stateid_maxsz +
2064                 1 /* nr of layouts */ +
2065                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2066 }
2067
2068 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2069 {
2070         return (op_encode_hdr_size +
2071                 1 /* locr_newsize */ +
2072                 2 /* ns_size */) * sizeof(__be32);
2073 }
2074
2075 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2076 {
2077         return (op_encode_hdr_size +
2078                 1 /* lrs_stateid */ +
2079                 op_encode_stateid_maxsz) * sizeof(__be32);
2080 }
2081 #endif /* CONFIG_NFSD_PNFS */
2082
2083
2084 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2085 {
2086         return (op_encode_hdr_size + 3) * sizeof(__be32);
2087 }
2088
2089 static const struct nfsd4_operation nfsd4_ops[] = {
2090         [OP_ACCESS] = {
2091                 .op_func = nfsd4_access,
2092                 .op_name = "OP_ACCESS",
2093                 .op_rsize_bop = nfsd4_access_rsize,
2094         },
2095         [OP_CLOSE] = {
2096                 .op_func = nfsd4_close,
2097                 .op_flags = OP_MODIFIES_SOMETHING,
2098                 .op_name = "OP_CLOSE",
2099                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2100                 .op_get_currentstateid = nfsd4_get_closestateid,
2101                 .op_set_currentstateid = nfsd4_set_closestateid,
2102         },
2103         [OP_COMMIT] = {
2104                 .op_func = nfsd4_commit,
2105                 .op_flags = OP_MODIFIES_SOMETHING,
2106                 .op_name = "OP_COMMIT",
2107                 .op_rsize_bop = nfsd4_commit_rsize,
2108         },
2109         [OP_CREATE] = {
2110                 .op_func = nfsd4_create,
2111                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2112                 .op_name = "OP_CREATE",
2113                 .op_rsize_bop = nfsd4_create_rsize,
2114         },
2115         [OP_DELEGRETURN] = {
2116                 .op_func = nfsd4_delegreturn,
2117                 .op_flags = OP_MODIFIES_SOMETHING,
2118                 .op_name = "OP_DELEGRETURN",
2119                 .op_rsize_bop = nfsd4_only_status_rsize,
2120                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2121         },
2122         [OP_GETATTR] = {
2123                 .op_func = nfsd4_getattr,
2124                 .op_flags = ALLOWED_ON_ABSENT_FS,
2125                 .op_rsize_bop = nfsd4_getattr_rsize,
2126                 .op_name = "OP_GETATTR",
2127         },
2128         [OP_GETFH] = {
2129                 .op_func = nfsd4_getfh,
2130                 .op_name = "OP_GETFH",
2131                 .op_rsize_bop = nfsd4_getfh_rsize,
2132         },
2133         [OP_LINK] = {
2134                 .op_func = nfsd4_link,
2135                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2136                                 | OP_CACHEME,
2137                 .op_name = "OP_LINK",
2138                 .op_rsize_bop = nfsd4_link_rsize,
2139         },
2140         [OP_LOCK] = {
2141                 .op_func = nfsd4_lock,
2142                 .op_flags = OP_MODIFIES_SOMETHING |
2143                                 OP_NONTRIVIAL_ERROR_ENCODE,
2144                 .op_name = "OP_LOCK",
2145                 .op_rsize_bop = nfsd4_lock_rsize,
2146                 .op_set_currentstateid = nfsd4_set_lockstateid,
2147         },
2148         [OP_LOCKT] = {
2149                 .op_func = nfsd4_lockt,
2150                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2151                 .op_name = "OP_LOCKT",
2152                 .op_rsize_bop = nfsd4_lock_rsize,
2153         },
2154         [OP_LOCKU] = {
2155                 .op_func = nfsd4_locku,
2156                 .op_flags = OP_MODIFIES_SOMETHING,
2157                 .op_name = "OP_LOCKU",
2158                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2159                 .op_get_currentstateid = nfsd4_get_lockustateid,
2160         },
2161         [OP_LOOKUP] = {
2162                 .op_func = nfsd4_lookup,
2163                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2164                 .op_name = "OP_LOOKUP",
2165                 .op_rsize_bop = nfsd4_only_status_rsize,
2166         },
2167         [OP_LOOKUPP] = {
2168                 .op_func = nfsd4_lookupp,
2169                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2170                 .op_name = "OP_LOOKUPP",
2171                 .op_rsize_bop = nfsd4_only_status_rsize,
2172         },
2173         [OP_NVERIFY] = {
2174                 .op_func = nfsd4_nverify,
2175                 .op_name = "OP_NVERIFY",
2176                 .op_rsize_bop = nfsd4_only_status_rsize,
2177         },
2178         [OP_OPEN] = {
2179                 .op_func = nfsd4_open,
2180                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2181                 .op_name = "OP_OPEN",
2182                 .op_rsize_bop = nfsd4_open_rsize,
2183                 .op_set_currentstateid = nfsd4_set_openstateid,
2184         },
2185         [OP_OPEN_CONFIRM] = {
2186                 .op_func = nfsd4_open_confirm,
2187                 .op_flags = OP_MODIFIES_SOMETHING,
2188                 .op_name = "OP_OPEN_CONFIRM",
2189                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2190         },
2191         [OP_OPEN_DOWNGRADE] = {
2192                 .op_func = nfsd4_open_downgrade,
2193                 .op_flags = OP_MODIFIES_SOMETHING,
2194                 .op_name = "OP_OPEN_DOWNGRADE",
2195                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2196                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2197                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2198         },
2199         [OP_PUTFH] = {
2200                 .op_func = nfsd4_putfh,
2201                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2202                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2203                 .op_name = "OP_PUTFH",
2204                 .op_rsize_bop = nfsd4_only_status_rsize,
2205         },
2206         [OP_PUTPUBFH] = {
2207                 .op_func = nfsd4_putrootfh,
2208                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2209                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2210                 .op_name = "OP_PUTPUBFH",
2211                 .op_rsize_bop = nfsd4_only_status_rsize,
2212         },
2213         [OP_PUTROOTFH] = {
2214                 .op_func = nfsd4_putrootfh,
2215                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2216                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2217                 .op_name = "OP_PUTROOTFH",
2218                 .op_rsize_bop = nfsd4_only_status_rsize,
2219         },
2220         [OP_READ] = {
2221                 .op_func = nfsd4_read,
2222                 .op_release = nfsd4_read_release,
2223                 .op_name = "OP_READ",
2224                 .op_rsize_bop = nfsd4_read_rsize,
2225                 .op_get_currentstateid = nfsd4_get_readstateid,
2226         },
2227         [OP_READDIR] = {
2228                 .op_func = nfsd4_readdir,
2229                 .op_name = "OP_READDIR",
2230                 .op_rsize_bop = nfsd4_readdir_rsize,
2231         },
2232         [OP_READLINK] = {
2233                 .op_func = nfsd4_readlink,
2234                 .op_name = "OP_READLINK",
2235                 .op_rsize_bop = nfsd4_readlink_rsize,
2236         },
2237         [OP_REMOVE] = {
2238                 .op_func = nfsd4_remove,
2239                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2240                 .op_name = "OP_REMOVE",
2241                 .op_rsize_bop = nfsd4_remove_rsize,
2242         },
2243         [OP_RENAME] = {
2244                 .op_func = nfsd4_rename,
2245                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2246                 .op_name = "OP_RENAME",
2247                 .op_rsize_bop = nfsd4_rename_rsize,
2248         },
2249         [OP_RENEW] = {
2250                 .op_func = nfsd4_renew,
2251                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2252                                 | OP_MODIFIES_SOMETHING,
2253                 .op_name = "OP_RENEW",
2254                 .op_rsize_bop = nfsd4_only_status_rsize,
2255
2256         },
2257         [OP_RESTOREFH] = {
2258                 .op_func = nfsd4_restorefh,
2259                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2260                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2261                 .op_name = "OP_RESTOREFH",
2262                 .op_rsize_bop = nfsd4_only_status_rsize,
2263         },
2264         [OP_SAVEFH] = {
2265                 .op_func = nfsd4_savefh,
2266                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2267                 .op_name = "OP_SAVEFH",
2268                 .op_rsize_bop = nfsd4_only_status_rsize,
2269         },
2270         [OP_SECINFO] = {
2271                 .op_func = nfsd4_secinfo,
2272                 .op_release = nfsd4_secinfo_release,
2273                 .op_flags = OP_HANDLES_WRONGSEC,
2274                 .op_name = "OP_SECINFO",
2275                 .op_rsize_bop = nfsd4_secinfo_rsize,
2276         },
2277         [OP_SETATTR] = {
2278                 .op_func = nfsd4_setattr,
2279                 .op_name = "OP_SETATTR",
2280                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2281                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2282                 .op_rsize_bop = nfsd4_setattr_rsize,
2283                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2284         },
2285         [OP_SETCLIENTID] = {
2286                 .op_func = nfsd4_setclientid,
2287                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2288                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2289                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2290                 .op_name = "OP_SETCLIENTID",
2291                 .op_rsize_bop = nfsd4_setclientid_rsize,
2292         },
2293         [OP_SETCLIENTID_CONFIRM] = {
2294                 .op_func = nfsd4_setclientid_confirm,
2295                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2296                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2297                 .op_name = "OP_SETCLIENTID_CONFIRM",
2298                 .op_rsize_bop = nfsd4_only_status_rsize,
2299         },
2300         [OP_VERIFY] = {
2301                 .op_func = nfsd4_verify,
2302                 .op_name = "OP_VERIFY",
2303                 .op_rsize_bop = nfsd4_only_status_rsize,
2304         },
2305         [OP_WRITE] = {
2306                 .op_func = nfsd4_write,
2307                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2308                 .op_name = "OP_WRITE",
2309                 .op_rsize_bop = nfsd4_write_rsize,
2310                 .op_get_currentstateid = nfsd4_get_writestateid,
2311         },
2312         [OP_RELEASE_LOCKOWNER] = {
2313                 .op_func = nfsd4_release_lockowner,
2314                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2315                                 | OP_MODIFIES_SOMETHING,
2316                 .op_name = "OP_RELEASE_LOCKOWNER",
2317                 .op_rsize_bop = nfsd4_only_status_rsize,
2318         },
2319
2320         /* NFSv4.1 operations */
2321         [OP_EXCHANGE_ID] = {
2322                 .op_func = nfsd4_exchange_id,
2323                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2324                                 | OP_MODIFIES_SOMETHING,
2325                 .op_name = "OP_EXCHANGE_ID",
2326                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2327         },
2328         [OP_BACKCHANNEL_CTL] = {
2329                 .op_func = nfsd4_backchannel_ctl,
2330                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2331                 .op_name = "OP_BACKCHANNEL_CTL",
2332                 .op_rsize_bop = nfsd4_only_status_rsize,
2333         },
2334         [OP_BIND_CONN_TO_SESSION] = {
2335                 .op_func = nfsd4_bind_conn_to_session,
2336                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2337                                 | OP_MODIFIES_SOMETHING,
2338                 .op_name = "OP_BIND_CONN_TO_SESSION",
2339                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2340         },
2341         [OP_CREATE_SESSION] = {
2342                 .op_func = nfsd4_create_session,
2343                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2344                                 | OP_MODIFIES_SOMETHING,
2345                 .op_name = "OP_CREATE_SESSION",
2346                 .op_rsize_bop = nfsd4_create_session_rsize,
2347         },
2348         [OP_DESTROY_SESSION] = {
2349                 .op_func = nfsd4_destroy_session,
2350                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2351                                 | OP_MODIFIES_SOMETHING,
2352                 .op_name = "OP_DESTROY_SESSION",
2353                 .op_rsize_bop = nfsd4_only_status_rsize,
2354         },
2355         [OP_SEQUENCE] = {
2356                 .op_func = nfsd4_sequence,
2357                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2358                 .op_name = "OP_SEQUENCE",
2359                 .op_rsize_bop = nfsd4_sequence_rsize,
2360         },
2361         [OP_DESTROY_CLIENTID] = {
2362                 .op_func = nfsd4_destroy_clientid,
2363                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2364                                 | OP_MODIFIES_SOMETHING,
2365                 .op_name = "OP_DESTROY_CLIENTID",
2366                 .op_rsize_bop = nfsd4_only_status_rsize,
2367         },
2368         [OP_RECLAIM_COMPLETE] = {
2369                 .op_func = nfsd4_reclaim_complete,
2370                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2371                 .op_name = "OP_RECLAIM_COMPLETE",
2372                 .op_rsize_bop = nfsd4_only_status_rsize,
2373         },
2374         [OP_SECINFO_NO_NAME] = {
2375                 .op_func = nfsd4_secinfo_no_name,
2376                 .op_release = nfsd4_secinfo_no_name_release,
2377                 .op_flags = OP_HANDLES_WRONGSEC,
2378                 .op_name = "OP_SECINFO_NO_NAME",
2379                 .op_rsize_bop = nfsd4_secinfo_rsize,
2380         },
2381         [OP_TEST_STATEID] = {
2382                 .op_func = nfsd4_test_stateid,
2383                 .op_flags = ALLOWED_WITHOUT_FH,
2384                 .op_name = "OP_TEST_STATEID",
2385                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2386         },
2387         [OP_FREE_STATEID] = {
2388                 .op_func = nfsd4_free_stateid,
2389                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2390                 .op_name = "OP_FREE_STATEID",
2391                 .op_get_currentstateid = nfsd4_get_freestateid,
2392                 .op_rsize_bop = nfsd4_only_status_rsize,
2393         },
2394 #ifdef CONFIG_NFSD_PNFS
2395         [OP_GETDEVICEINFO] = {
2396                 .op_func = nfsd4_getdeviceinfo,
2397                 .op_release = nfsd4_getdeviceinfo_release,
2398                 .op_flags = ALLOWED_WITHOUT_FH,
2399                 .op_name = "OP_GETDEVICEINFO",
2400                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2401         },
2402         [OP_LAYOUTGET] = {
2403                 .op_func = nfsd4_layoutget,
2404                 .op_release = nfsd4_layoutget_release,
2405                 .op_flags = OP_MODIFIES_SOMETHING,
2406                 .op_name = "OP_LAYOUTGET",
2407                 .op_rsize_bop = nfsd4_layoutget_rsize,
2408         },
2409         [OP_LAYOUTCOMMIT] = {
2410                 .op_func = nfsd4_layoutcommit,
2411                 .op_flags = OP_MODIFIES_SOMETHING,
2412                 .op_name = "OP_LAYOUTCOMMIT",
2413                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2414         },
2415         [OP_LAYOUTRETURN] = {
2416                 .op_func = nfsd4_layoutreturn,
2417                 .op_flags = OP_MODIFIES_SOMETHING,
2418                 .op_name = "OP_LAYOUTRETURN",
2419                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2420         },
2421 #endif /* CONFIG_NFSD_PNFS */
2422
2423         /* NFSv4.2 operations */
2424         [OP_ALLOCATE] = {
2425                 .op_func = nfsd4_allocate,
2426                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2427                 .op_name = "OP_ALLOCATE",
2428                 .op_rsize_bop = nfsd4_only_status_rsize,
2429         },
2430         [OP_DEALLOCATE] = {
2431                 .op_func = nfsd4_deallocate,
2432                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2433                 .op_name = "OP_DEALLOCATE",
2434                 .op_rsize_bop = nfsd4_only_status_rsize,
2435         },
2436         [OP_CLONE] = {
2437                 .op_func = nfsd4_clone,
2438                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2439                 .op_name = "OP_CLONE",
2440                 .op_rsize_bop = nfsd4_only_status_rsize,
2441         },
2442         [OP_COPY] = {
2443                 .op_func = nfsd4_copy,
2444                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2445                 .op_name = "OP_COPY",
2446                 .op_rsize_bop = nfsd4_copy_rsize,
2447         },
2448         [OP_SEEK] = {
2449                 .op_func = nfsd4_seek,
2450                 .op_name = "OP_SEEK",
2451                 .op_rsize_bop = nfsd4_seek_rsize,
2452         },
2453 };
2454
2455 /**
2456  * nfsd4_spo_must_allow - Determine if the compound op contains an
2457  * operation that is allowed to be sent with machine credentials
2458  *
2459  * @rqstp: a pointer to the struct svc_rqst
2460  *
2461  * Checks to see if the compound contains a spo_must_allow op
2462  * and confirms that it was sent with the proper machine creds.
2463  */
2464
2465 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2466 {
2467         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2468         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2469         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2470         struct nfsd4_compound_state *cstate = &resp->cstate;
2471         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2472         u32 opiter;
2473
2474         if (!cstate->minorversion)
2475                 return false;
2476
2477         if (cstate->spo_must_allowed == true)
2478                 return true;
2479
2480         opiter = resp->opcnt;
2481         while (opiter < argp->opcnt) {
2482                 this = &argp->ops[opiter++];
2483                 if (test_bit(this->opnum, allow->u.longs) &&
2484                         cstate->clp->cl_mach_cred &&
2485                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2486                         cstate->spo_must_allowed = true;
2487                         return true;
2488                 }
2489         }
2490         cstate->spo_must_allowed = false;
2491         return false;
2492 }
2493
2494 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2495 {
2496         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2497                 return op_encode_hdr_size * sizeof(__be32);
2498
2499         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2500         return OPDESC(op)->op_rsize_bop(rqstp, op);
2501 }
2502
2503 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2504 {
2505         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2506                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2507                         op->opnum, nfsd4_op_name(op->opnum));
2508                 WARN_ON_ONCE(1);
2509         }
2510 }
2511
2512 static const char *nfsd4_op_name(unsigned opnum)
2513 {
2514         if (opnum < ARRAY_SIZE(nfsd4_ops))
2515                 return nfsd4_ops[opnum].op_name;
2516         return "unknown_operation";
2517 }
2518
2519 #define nfsd4_voidres                   nfsd4_voidargs
2520 struct nfsd4_voidargs { int dummy; };
2521
2522 static const struct svc_procedure nfsd_procedures4[2] = {
2523         [NFSPROC4_NULL] = {
2524                 .pc_func = nfsd4_proc_null,
2525                 .pc_encode = nfs4svc_encode_voidres,
2526                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2527                 .pc_ressize = sizeof(struct nfsd4_voidres),
2528                 .pc_cachetype = RC_NOCACHE,
2529                 .pc_xdrressize = 1,
2530         },
2531         [NFSPROC4_COMPOUND] = {
2532                 .pc_func = nfsd4_proc_compound,
2533                 .pc_decode = nfs4svc_decode_compoundargs,
2534                 .pc_encode = nfs4svc_encode_compoundres,
2535                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2536                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2537                 .pc_release = nfsd4_release_compoundargs,
2538                 .pc_cachetype = RC_NOCACHE,
2539                 .pc_xdrressize = NFSD_BUFSIZE/4,
2540         },
2541 };
2542
2543 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2544 const struct svc_version nfsd_version4 = {
2545         .vs_vers                = 4,
2546         .vs_nproc               = 2,
2547         .vs_proc                = nfsd_procedures4,
2548         .vs_count               = nfsd_count3,
2549         .vs_dispatch            = nfsd_dispatch,
2550         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2551         .vs_rpcb_optnl          = true,
2552         .vs_need_cong_ctrl      = true,
2553 };
2554
2555 /*
2556  * Local variables:
2557  *  c-basic-offset: 8
2558  * End:
2559  */