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            struct nfsd4_open *open)
 348 {
 349         __be32 status;
 350         struct svc_fh *resfh = NULL;
 351         struct net *net = SVC_NET(rqstp);
 352         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 353
 354         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 355                 (int)open->op_fname.len, open->op_fname.data,
 356                 open->op_openowner);
 357
 358         /* This check required by spec. */
 359         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 360                 return nfserr_inval;
 361
 362         open->op_created = 0;
 363         /*
 364          * RFC5661 18.51.3
 365          * Before RECLAIM_COMPLETE done, server should deny new lock
 366          */
 367         if (nfsd4_has_session(cstate) &&
 368             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 369                       &cstate->session->se_client->cl_flags) &&
 370             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 371                 return nfserr_grace;
 372
 373         if (nfsd4_has_session(cstate))
 374                 copy_clientid(&open->op_clientid, cstate->session);
 375
 376         /* check seqid for replay. set nfs4_owner */
 377         status = nfsd4_process_open1(cstate, open, nn);
 378         if (status == nfserr_replay_me) {
 379                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 380                 fh_put(&cstate->current_fh);
 381                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 382                                 &rp->rp_openfh);
 383                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 384                 if (status)
 385                         dprintk("nfsd4_open: replay failed"
 386                                 " restoring previous filehandle\n");
 387                 else
 388                         status = nfserr_replay_me;
 389         }
 390         if (status)
 391                 goto out;
 392         if (open->op_xdr_error) {
 393                 status = open->op_xdr_error;
 394                 goto out;
 395         }
 396
 397         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 398         if (status)
 399                 goto out;
 400
 401         /* Openowner is now set, so sequence id will get bumped.  Now we need
 402          * these checks before we do any creates: */
 403         status = nfserr_grace;
 404         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 405                 goto out;
 406         status = nfserr_no_grace;
 407         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 408                 goto out;
 409
 410         switch (open->op_claim_type) {
 411                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 412                 case NFS4_OPEN_CLAIM_NULL:
 413                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 414                         if (status)
 415                                 goto out;
 416                         break;
 417                 case NFS4_OPEN_CLAIM_PREVIOUS:
 418                         status = nfs4_check_open_reclaim(&open->op_clientid,
 419                                                          cstate, nn);
 420                         if (status)
 421                                 goto out;
 422                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 423                 case NFS4_OPEN_CLAIM_FH:
 424                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 425                         status = do_open_fhandle(rqstp, cstate, open);
 426                         if (status)
 427                                 goto out;
 428                         resfh = &cstate->current_fh;
 429                         break;
 430                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 431                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 432                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 433                                 open->op_claim_type);
 434                         status = nfserr_notsupp;
 435                         goto out;
 436                 default:
 437                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 438                                 open->op_claim_type);
 439                         status = nfserr_inval;
 440                         goto out;
 441         }
 442         /*
 443          * nfsd4_process_open2() does the actual opening of the file.  If
 444          * successful, it (1) truncates the file if open->op_truncate was
 445          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 446          */
 447         status = nfsd4_process_open2(rqstp, resfh, open);
 448         WARN(status && open->op_created,
 449              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 450              be32_to_cpu(status));
 451 out:
 452         if (resfh && resfh != &cstate->current_fh) {
 453                 fh_dup2(&cstate->current_fh, resfh);
 454                 fh_put(resfh);
 455                 kfree(resfh);
 456         }
 457         nfsd4_cleanup_open_state(cstate, open);
 458         nfsd4_bump_seqid(cstate, status);
 459         return status;
 460 }
 461
 462 /*
 463  * OPEN is the only seqid-mutating operation whose decoding can fail
 464  * with a seqid-mutating error (specifically, decoding of user names in
 465  * the attributes).  Therefore we have to do some processing to look up
 466  * the stateowner so that we can bump the seqid.
 467  */
 468 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 469 {
 470         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 471
 472         if (!seqid_mutating_err(ntohl(op->status)))
 473                 return op->status;
 474         if (nfsd4_has_session(cstate))
 475                 return op->status;
 476         open->op_xdr_error = op->status;
 477         return nfsd4_open(rqstp, cstate, open);
 478 }
 479
 480 /*
 481  * filehandle-manipulating ops.
 482  */
 483 static __be32
 484 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 485             struct svc_fh **getfh)
 486 {
 487         if (!cstate->current_fh.fh_dentry)
 488                 return nfserr_nofilehandle;
 489
 490         *getfh = &cstate->current_fh;
 491         return nfs_ok;
 492 }
 493
 494 static __be32
 495 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 496             struct nfsd4_putfh *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                 void *arg)
 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                 void *arg)
 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              void *arg)
 534 {
 535         if (!cstate->current_fh.fh_dentry)
 536                 return nfserr_nofilehandle;
 537
 538         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 539         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 540                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 541                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 542         }
 543         return nfs_ok;
 544 }
 545
 546 /*
 547  * misc nfsv4 ops
 548  */
 549 static __be32
 550 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 551              struct nfsd4_access *access)
 552 {
 553         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 554                 return nfserr_inval;
 555
 556         access->ac_resp_access = access->ac_req_access;
 557         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 558                            &access->ac_supported);
 559 }
 560
 561 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 562 {
 563         __be32 verf[2];
 564         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 565
 566         /*
 567          * This is opaque to client, so no need to byte-swap. Use
 568          * __force to keep sparse happy
 569          */
 570         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 571         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 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              struct nfsd4_commit *commit)
 578 {
 579         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 580         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 581                              commit->co_count);
 582 }
 583
 584 static __be32
 585 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 586              struct nfsd4_create *create)
 587 {
 588         struct svc_fh resfh;
 589         __be32 status;
 590         dev_t rdev;
 591
 592         fh_init(&resfh, NFS4_FHSIZE);
 593
 594         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 595         if (status)
 596                 return status;
 597
 598         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 599                                     nfsd_attrmask);
 600         if (status)
 601                 return status;
 602
 603         switch (create->cr_type) {
 604         case NF4LNK:
 605                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 606                                       create->cr_name, create->cr_namelen,
 607                                       create->cr_data, &resfh);
 608                 break;
 609
 610         case NF4BLK:
 611                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 612                 if (MAJOR(rdev) != create->cr_specdata1 ||
 613                     MINOR(rdev) != create->cr_specdata2)
 614                         return nfserr_inval;
 615                 status = nfsd_create(rqstp, &cstate->current_fh,
 616                                      create->cr_name, create->cr_namelen,
 617                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 618                 break;
 619
 620         case NF4CHR:
 621                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 622                 if (MAJOR(rdev) != create->cr_specdata1 ||
 623                     MINOR(rdev) != create->cr_specdata2)
 624                         return nfserr_inval;
 625                 status = nfsd_create(rqstp, &cstate->current_fh,
 626                                      create->cr_name, create->cr_namelen,
 627                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 628                 break;
 629
 630         case NF4SOCK:
 631                 status = nfsd_create(rqstp, &cstate->current_fh,
 632                                      create->cr_name, create->cr_namelen,
 633                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 634                 break;
 635
 636         case NF4FIFO:
 637                 status = nfsd_create(rqstp, &cstate->current_fh,
 638                                      create->cr_name, create->cr_namelen,
 639                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 640                 break;
 641
 642         case NF4DIR:
 643                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 644                 status = nfsd_create(rqstp, &cstate->current_fh,
 645                                      create->cr_name, create->cr_namelen,
 646                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 647                 break;
 648
 649         default:
 650                 status = nfserr_badtype;
 651         }
 652
 653         if (status)
 654                 goto out;
 655
 656         if (create->cr_label.len)
 657                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 658
 659         if (create->cr_acl != NULL)
 660                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 661                                 create->cr_bmval);
 662
 663         fh_unlock(&cstate->current_fh);
 664         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 665         fh_dup2(&cstate->current_fh, &resfh);
 666 out:
 667         fh_put(&resfh);
 668         return status;
 669 }
 670
 671 static __be32
 672 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 673               struct nfsd4_getattr *getattr)
 674 {
 675         __be32 status;
 676
 677         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 678         if (status)
 679                 return status;
 680
 681         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 682                 return nfserr_inval;
 683
 684         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 685         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 686         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 687
 688         getattr->ga_fhp = &cstate->current_fh;
 689         return nfs_ok;
 690 }
 691
 692 static __be32
 693 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 694            struct nfsd4_link *link)
 695 {
 696         __be32 status = nfserr_nofilehandle;
 697
 698         if (!cstate->save_fh.fh_dentry)
 699                 return status;
 700         status = nfsd_link(rqstp, &cstate->current_fh,
 701                            link->li_name, link->li_namelen, &cstate->save_fh);
 702         if (!status)
 703                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 704         return status;
 705 }
 706
 707 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 708 {
 709         struct svc_fh tmp_fh;
 710         __be32 ret;
 711
 712         fh_init(&tmp_fh, NFS4_FHSIZE);
 713         ret = exp_pseudoroot(rqstp, &tmp_fh);
 714         if (ret)
 715                 return ret;
 716         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 717                 fh_put(&tmp_fh);
 718                 return nfserr_noent;
 719         }
 720         fh_put(&tmp_fh);
 721         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 722 }
 723
 724 static __be32
 725 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 726               void *arg)
 727 {
 728         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 729 }
 730
 731 static __be32
 732 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 733              struct nfsd4_lookup *lookup)
 734 {
 735         return nfsd_lookup(rqstp, &cstate->current_fh,
 736                            lookup->lo_name, lookup->lo_len,
 737                            &cstate->current_fh);
 738 }
 739
 740 static __be32
 741 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 742            struct nfsd4_read *read)
 743 {
 744         __be32 status;
 745
 746         read->rd_filp = NULL;
 747         if (read->rd_offset >= OFFSET_MAX)
 748                 return nfserr_inval;
 749
 750         /*
 751          * If we do a zero copy read, then a client will see read data
 752          * that reflects the state of the file *after* performing the
 753          * following compound.
 754          *
 755          * To ensure proper ordering, we therefore turn off zero copy if
 756          * the client wants us to do more in this compound:
 757          */
 758         if (!nfsd4_last_compound_op(rqstp))
 759                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 760
 761         /* check stateid */
 762         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 763                                         &read->rd_stateid, RD_STATE,
 764                                         &read->rd_filp, &read->rd_tmp_file);
 765         if (status) {
 766                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 767                 goto out;
 768         }
 769         status = nfs_ok;
 770 out:
 771         read->rd_rqstp = rqstp;
 772         read->rd_fhp = &cstate->current_fh;
 773         return status;
 774 }
 775
 776 static __be32
 777 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 778               struct nfsd4_readdir *readdir)
 779 {
 780         u64 cookie = readdir->rd_cookie;
 781         static const nfs4_verifier zeroverf;
 782
 783         /* no need to check permission - this will be done in nfsd_readdir() */
 784
 785         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 786                 return nfserr_inval;
 787
 788         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 789         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 790         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 791
 792         if ((cookie == 1) || (cookie == 2) ||
 793             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 794                 return nfserr_bad_cookie;
 795
 796         readdir->rd_rqstp = rqstp;
 797         readdir->rd_fhp = &cstate->current_fh;
 798         return nfs_ok;
 799 }
 800
 801 static __be32
 802 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 803                struct nfsd4_readlink *readlink)
 804 {
 805         readlink->rl_rqstp = rqstp;
 806         readlink->rl_fhp = &cstate->current_fh;
 807         return nfs_ok;
 808 }
 809
 810 static __be32
 811 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 812              struct nfsd4_remove *remove)
 813 {
 814         __be32 status;
 815
 816         if (opens_in_grace(SVC_NET(rqstp)))
 817                 return nfserr_grace;
 818         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 819                              remove->rm_name, remove->rm_namelen);
 820         if (!status) {
 821                 fh_unlock(&cstate->current_fh);
 822                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 823         }
 824         return status;
 825 }
 826
 827 static __be32
 828 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 829              struct nfsd4_rename *rename)
 830 {
 831         __be32 status = nfserr_nofilehandle;
 832
 833         if (!cstate->save_fh.fh_dentry)
 834                 return status;
 835         if (opens_in_grace(SVC_NET(rqstp)) &&
 836                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 837                 return nfserr_grace;
 838         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 839                              rename->rn_snamelen, &cstate->current_fh,
 840                              rename->rn_tname, rename->rn_tnamelen);
 841         if (status)
 842                 return status;
 843         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 844         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 845         return nfs_ok;
 846 }
 847
 848 static __be32
 849 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 850               struct nfsd4_secinfo *secinfo)
 851 {
 852         struct svc_export *exp;
 853         struct dentry *dentry;
 854         __be32 err;
 855
 856         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 857         if (err)
 858                 return err;
 859         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 860                                     secinfo->si_name, secinfo->si_namelen,
 861                                     &exp, &dentry);
 862         if (err)
 863                 return err;
 864         fh_unlock(&cstate->current_fh);
 865         if (d_really_is_negative(dentry)) {
 866                 exp_put(exp);
 867                 err = nfserr_noent;
 868         } else
 869                 secinfo->si_exp = exp;
 870         dput(dentry);
 871         if (cstate->minorversion)
 872                 /* See rfc 5661 section 2.6.3.1.1.8 */
 873                 fh_put(&cstate->current_fh);
 874         return err;
 875 }
 876
 877 static __be32
 878 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 879               struct nfsd4_secinfo_no_name *sin)
 880 {
 881         __be32 err;
 882
 883         switch (sin->sin_style) {
 884         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 885                 break;
 886         case NFS4_SECINFO_STYLE4_PARENT:
 887                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 888                 if (err)
 889                         return err;
 890                 break;
 891         default:
 892                 return nfserr_inval;
 893         }
 894
 895         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 896         fh_put(&cstate->current_fh);
 897         return nfs_ok;
 898 }
 899
 900 static __be32
 901 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 902               struct nfsd4_setattr *setattr)
 903 {
 904         __be32 status = nfs_ok;
 905         int err;
 906
 907         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 908                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 909                                 &cstate->current_fh, &setattr->sa_stateid,
 910                                 WR_STATE, NULL, NULL);
 911                 if (status) {
 912                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 913                         return status;
 914                 }
 915         }
 916         err = fh_want_write(&cstate->current_fh);
 917         if (err)
 918                 return nfserrno(err);
 919         status = nfs_ok;
 920
 921         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 922                                     nfsd_attrmask);
 923         if (status)
 924                 goto out;
 925
 926         if (setattr->sa_acl != NULL)
 927                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 928                                             setattr->sa_acl);
 929         if (status)
 930                 goto out;
 931         if (setattr->sa_label.len)
 932                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 933                                 &setattr->sa_label);
 934         if (status)
 935                 goto out;
 936         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 937                                 0, (time_t)0);
 938 out:
 939         fh_drop_write(&cstate->current_fh);
 940         return status;
 941 }
 942
 943 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 944 {
 945         int i = 1;
 946         int buflen = write->wr_buflen;
 947
 948         vec[0].iov_base = write->wr_head.iov_base;
 949         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 950         buflen -= vec[0].iov_len;
 951
 952         while (buflen) {
 953                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 954                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 955                 buflen -= vec[i].iov_len;
 956                 i++;
 957         }
 958         return i;
 959 }
 960
 961 static __be32
 962 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 963             struct nfsd4_write *write)
 964 {
 965         stateid_t *stateid = &write->wr_stateid;
 966         struct file *filp = NULL;
 967         __be32 status = nfs_ok;
 968         unsigned long cnt;
 969         int nvecs;
 970
 971         if (write->wr_offset >= OFFSET_MAX)
 972                 return nfserr_inval;
 973
 974         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 975                                                 stateid, WR_STATE, &filp, NULL);
 976         if (status) {
 977                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 978                 return status;
 979         }
 980
 981         cnt = write->wr_buflen;
 982         write->wr_how_written = write->wr_stable_how;
 983         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
 984
 985         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
 986         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
 987
 988         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
 989                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
 990                                 write->wr_how_written);
 991         fput(filp);
 992
 993         write->wr_bytes_written = cnt;
 994
 995         return status;
 996 }
 997
 998 static __be32
 999 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1000                   stateid_t *src_stateid, struct file **src,
1001                   stateid_t *dst_stateid, struct file **dst)
1002 {
1003         __be32 status;
1004
1005         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1006                                             src_stateid, RD_STATE, src, NULL);
1007         if (status) {
1008                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1009                 goto out;
1010         }
1011
1012         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1013                                             dst_stateid, WR_STATE, dst, NULL);
1014         if (status) {
1015                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1016                 goto out_put_src;
1017         }
1018
1019         /* fix up for NFS-specific error code */
1020         if (!S_ISREG(file_inode(*src)->i_mode) ||
1021             !S_ISREG(file_inode(*dst)->i_mode)) {
1022                 status = nfserr_wrong_type;
1023                 goto out_put_dst;
1024         }
1025
1026 out:
1027         return status;
1028 out_put_dst:
1029         fput(*dst);
1030 out_put_src:
1031         fput(*src);
1032         goto out;
1033 }
1034
1035 static __be32
1036 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1037                 struct nfsd4_clone *clone)
1038 {
1039         struct file *src, *dst;
1040         __be32 status;
1041
1042         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1043                                    &clone->cl_dst_stateid, &dst);
1044         if (status)
1045                 goto out;
1046
1047         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1048                         dst, clone->cl_dst_pos, clone->cl_count);
1049
1050         fput(dst);
1051         fput(src);
1052 out:
1053         return status;
1054 }
1055
1056 static __be32
1057 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1058                 struct nfsd4_copy *copy)
1059 {
1060         struct file *src, *dst;
1061         __be32 status;
1062         ssize_t bytes;
1063
1064         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1065                                    &copy->cp_dst_stateid, &dst);
1066         if (status)
1067                 goto out;
1068
1069         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1070                         dst, copy->cp_dst_pos, copy->cp_count);
1071
1072         if (bytes < 0)
1073                 status = nfserrno(bytes);
1074         else {
1075                 copy->cp_res.wr_bytes_written = bytes;
1076                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1077                 copy->cp_consecutive = 1;
1078                 copy->cp_synchronous = 1;
1079                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1080                 status = nfs_ok;
1081         }
1082
1083         fput(src);
1084         fput(dst);
1085 out:
1086         return status;
1087 }
1088
1089 static __be32
1090 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1091                 struct nfsd4_fallocate *fallocate, int flags)
1092 {
1093         __be32 status = nfserr_notsupp;
1094         struct file *file;
1095
1096         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1097                                             &fallocate->falloc_stateid,
1098                                             WR_STATE, &file, NULL);
1099         if (status != nfs_ok) {
1100                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1101                 return status;
1102         }
1103
1104         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1105                                      fallocate->falloc_offset,
1106                                      fallocate->falloc_length,
1107                                      flags);
1108         fput(file);
1109         return status;
1110 }
1111
1112 static __be32
1113 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1114                struct nfsd4_fallocate *fallocate)
1115 {
1116         return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1117 }
1118
1119 static __be32
1120 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1121                  struct nfsd4_fallocate *fallocate)
1122 {
1123         return nfsd4_fallocate(rqstp, cstate, fallocate,
1124                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1125 }
1126
1127 static __be32
1128 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1129                 struct nfsd4_seek *seek)
1130 {
1131         int whence;
1132         __be32 status;
1133         struct file *file;
1134
1135         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1136                                             &seek->seek_stateid,
1137                                             RD_STATE, &file, NULL);
1138         if (status) {
1139                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1140                 return status;
1141         }
1142
1143         switch (seek->seek_whence) {
1144         case NFS4_CONTENT_DATA:
1145                 whence = SEEK_DATA;
1146                 break;
1147         case NFS4_CONTENT_HOLE:
1148                 whence = SEEK_HOLE;
1149                 break;
1150         default:
1151                 status = nfserr_union_notsupp;
1152                 goto out;
1153         }
1154
1155         /*
1156          * Note:  This call does change file->f_pos, but nothing in NFSD
1157          *        should ever file->f_pos.
1158          */
1159         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1160         if (seek->seek_pos < 0)
1161                 status = nfserrno(seek->seek_pos);
1162         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1163                 seek->seek_eof = true;
1164
1165 out:
1166         fput(file);
1167         return status;
1168 }
1169
1170 /* This routine never returns NFS_OK!  If there are no other errors, it
1171  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1172  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1173  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1174  */
1175 static __be32
1176 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1177              struct nfsd4_verify *verify)
1178 {
1179         __be32 *buf, *p;
1180         int count;
1181         __be32 status;
1182
1183         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1184         if (status)
1185                 return status;
1186
1187         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1188         if (status)
1189                 return status;
1190
1191         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1192             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1193                 return nfserr_inval;
1194         if (verify->ve_attrlen & 3)
1195                 return nfserr_inval;
1196
1197         /* count in words:
1198          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1199          */
1200         count = 4 + (verify->ve_attrlen >> 2);
1201         buf = kmalloc(count << 2, GFP_KERNEL);
1202         if (!buf)
1203                 return nfserr_jukebox;
1204
1205         p = buf;
1206         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1207                                     cstate->current_fh.fh_export,
1208                                     cstate->current_fh.fh_dentry,
1209                                     verify->ve_bmval,
1210                                     rqstp, 0);
1211         /*
1212          * If nfsd4_encode_fattr() ran out of space, assume that's because
1213          * the attributes are longer (hence different) than those given:
1214          */
1215         if (status == nfserr_resource)
1216                 status = nfserr_not_same;
1217         if (status)
1218                 goto out_kfree;
1219
1220         /* skip bitmap */
1221         p = buf + 1 + ntohl(buf[0]);
1222         status = nfserr_not_same;
1223         if (ntohl(*p++) != verify->ve_attrlen)
1224                 goto out_kfree;
1225         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1226                 status = nfserr_same;
1227
1228 out_kfree:
1229         kfree(buf);
1230         return status;
1231 }
1232
1233 static __be32
1234 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1235               struct nfsd4_verify *verify)
1236 {
1237         __be32 status;
1238
1239         status = _nfsd4_verify(rqstp, cstate, verify);
1240         return status == nfserr_not_same ? nfs_ok : status;
1241 }
1242
1243 static __be32
1244 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1245              struct nfsd4_verify *verify)
1246 {
1247         __be32 status;
1248
1249         status = _nfsd4_verify(rqstp, cstate, verify);
1250         return status == nfserr_same ? nfs_ok : status;
1251 }
1252
1253 #ifdef CONFIG_NFSD_PNFS
1254 static const struct nfsd4_layout_ops *
1255 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1256 {
1257         if (!exp->ex_layout_types) {
1258                 dprintk("%s: export does not support pNFS\n", __func__);
1259                 return NULL;
1260         }
1261
1262         if (layout_type >= LAYOUT_TYPE_MAX ||
1263             !(exp->ex_layout_types & (1 << layout_type))) {
1264                 dprintk("%s: layout type %d not supported\n",
1265                         __func__, layout_type);
1266                 return NULL;
1267         }
1268
1269         return nfsd4_layout_ops[layout_type];
1270 }
1271
1272 static __be32
1273 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1274                 struct nfsd4_compound_state *cstate,
1275                 struct nfsd4_getdeviceinfo *gdp)
1276 {
1277         const struct nfsd4_layout_ops *ops;
1278         struct nfsd4_deviceid_map *map;
1279         struct svc_export *exp;
1280         __be32 nfserr;
1281
1282         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1283                __func__,
1284                gdp->gd_layout_type,
1285                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1286                gdp->gd_maxcount);
1287
1288         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1289         if (!map) {
1290                 dprintk("%s: couldn't find device ID to export mapping!\n",
1291                         __func__);
1292                 return nfserr_noent;
1293         }
1294
1295         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1296         if (IS_ERR(exp)) {
1297                 dprintk("%s: could not find device id\n", __func__);
1298                 return nfserr_noent;
1299         }
1300
1301         nfserr = nfserr_layoutunavailable;
1302         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1303         if (!ops)
1304                 goto out;
1305
1306         nfserr = nfs_ok;
1307         if (gdp->gd_maxcount != 0) {
1308                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1309                                 rqstp, cstate->session->se_client, gdp);
1310         }
1311
1312         gdp->gd_notify_types &= ops->notify_types;
1313 out:
1314         exp_put(exp);
1315         return nfserr;
1316 }
1317
1318 static __be32
1319 nfsd4_layoutget(struct svc_rqst *rqstp,
1320                 struct nfsd4_compound_state *cstate,
1321                 struct nfsd4_layoutget *lgp)
1322 {
1323         struct svc_fh *current_fh = &cstate->current_fh;
1324         const struct nfsd4_layout_ops *ops;
1325         struct nfs4_layout_stateid *ls;
1326         __be32 nfserr;
1327         int accmode;
1328
1329         switch (lgp->lg_seg.iomode) {
1330         case IOMODE_READ:
1331                 accmode = NFSD_MAY_READ;
1332                 break;
1333         case IOMODE_RW:
1334                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1335                 break;
1336         default:
1337                 dprintk("%s: invalid iomode %d\n",
1338                         __func__, lgp->lg_seg.iomode);
1339                 nfserr = nfserr_badiomode;
1340                 goto out;
1341         }
1342
1343         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1344         if (nfserr)
1345                 goto out;
1346
1347         nfserr = nfserr_layoutunavailable;
1348         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1349         if (!ops)
1350                 goto out;
1351
1352         /*
1353          * Verify minlength and range as per RFC5661:
1354          *  o  If loga_length is less than loga_minlength,
1355          *     the metadata server MUST return NFS4ERR_INVAL.
1356          *  o  If the sum of loga_offset and loga_minlength exceeds
1357          *     NFS4_UINT64_MAX, and loga_minlength is not
1358          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1359          *  o  If the sum of loga_offset and loga_length exceeds
1360          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1361          *     the error NFS4ERR_INVAL MUST result.
1362          */
1363         nfserr = nfserr_inval;
1364         if (lgp->lg_seg.length < lgp->lg_minlength ||
1365             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1366              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1367             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1368              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1369                 goto out;
1370         if (lgp->lg_seg.length == 0)
1371                 goto out;
1372
1373         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1374                                                 true, lgp->lg_layout_type, &ls);
1375         if (nfserr) {
1376                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1377                 goto out;
1378         }
1379
1380         nfserr = nfserr_recallconflict;
1381         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1382                 goto out_put_stid;
1383
1384         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1385                                      current_fh, lgp);
1386         if (nfserr)
1387                 goto out_put_stid;
1388
1389         nfserr = nfsd4_insert_layout(lgp, ls);
1390
1391 out_put_stid:
1392         mutex_unlock(&ls->ls_mutex);
1393         nfs4_put_stid(&ls->ls_stid);
1394 out:
1395         return nfserr;
1396 }
1397
1398 static __be32
1399 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1400                 struct nfsd4_compound_state *cstate,
1401                 struct nfsd4_layoutcommit *lcp)
1402 {
1403         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1404         struct svc_fh *current_fh = &cstate->current_fh;
1405         const struct nfsd4_layout_ops *ops;
1406         loff_t new_size = lcp->lc_last_wr + 1;
1407         struct inode *inode;
1408         struct nfs4_layout_stateid *ls;
1409         __be32 nfserr;
1410
1411         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1412         if (nfserr)
1413                 goto out;
1414
1415         nfserr = nfserr_layoutunavailable;
1416         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1417         if (!ops)
1418                 goto out;
1419         inode = d_inode(current_fh->fh_dentry);
1420
1421         nfserr = nfserr_inval;
1422         if (new_size <= seg->offset) {
1423                 dprintk("pnfsd: last write before layout segment\n");
1424                 goto out;
1425         }
1426         if (new_size > seg->offset + seg->length) {
1427                 dprintk("pnfsd: last write beyond layout segment\n");
1428                 goto out;
1429         }
1430         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1431                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1432                 goto out;
1433         }
1434
1435         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1436                                                 false, lcp->lc_layout_type,
1437                                                 &ls);
1438         if (nfserr) {
1439                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1440                 /* fixup error code as per RFC5661 */
1441                 if (nfserr == nfserr_bad_stateid)
1442                         nfserr = nfserr_badlayout;
1443                 goto out;
1444         }
1445
1446         /* LAYOUTCOMMIT does not require any serialization */
1447         mutex_unlock(&ls->ls_mutex);
1448
1449         if (new_size > i_size_read(inode)) {
1450                 lcp->lc_size_chg = 1;
1451                 lcp->lc_newsize = new_size;
1452         } else {
1453                 lcp->lc_size_chg = 0;
1454         }
1455
1456         nfserr = ops->proc_layoutcommit(inode, lcp);
1457         nfs4_put_stid(&ls->ls_stid);
1458 out:
1459         return nfserr;
1460 }
1461
1462 static __be32
1463 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1464                 struct nfsd4_compound_state *cstate,
1465                 struct nfsd4_layoutreturn *lrp)
1466 {
1467         struct svc_fh *current_fh = &cstate->current_fh;
1468         __be32 nfserr;
1469
1470         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1471         if (nfserr)
1472                 goto out;
1473
1474         nfserr = nfserr_layoutunavailable;
1475         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1476                 goto out;
1477
1478         switch (lrp->lr_seg.iomode) {
1479         case IOMODE_READ:
1480         case IOMODE_RW:
1481         case IOMODE_ANY:
1482                 break;
1483         default:
1484                 dprintk("%s: invalid iomode %d\n", __func__,
1485                         lrp->lr_seg.iomode);
1486                 nfserr = nfserr_inval;
1487                 goto out;
1488         }
1489
1490         switch (lrp->lr_return_type) {
1491         case RETURN_FILE:
1492                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1493                 break;
1494         case RETURN_FSID:
1495         case RETURN_ALL:
1496                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1497                 break;
1498         default:
1499                 dprintk("%s: invalid return_type %d\n", __func__,
1500                         lrp->lr_return_type);
1501                 nfserr = nfserr_inval;
1502                 break;
1503         }
1504 out:
1505         return nfserr;
1506 }
1507 #endif /* CONFIG_NFSD_PNFS */
1508
1509 /*
1510  * NULL call.
1511  */
1512 static __be32
1513 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1514 {
1515         return nfs_ok;
1516 }
1517
1518 static inline void nfsd4_increment_op_stats(u32 opnum)
1519 {
1520         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1521                 nfsdstats.nfs4_opcount[opnum]++;
1522 }
1523
1524 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1525                               void *);
1526 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1527 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1528 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1529
1530 enum nfsd4_op_flags {
1531         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1532         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1533         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1534         /* For rfc 5661 section 2.6.3.1.1: */
1535         OP_HANDLES_WRONGSEC = 1 << 3,
1536         OP_IS_PUTFH_LIKE = 1 << 4,
1537         /*
1538          * These are the ops whose result size we estimate before
1539          * encoding, to avoid performing an op then not being able to
1540          * respond or cache a response.  This includes writes and setattrs
1541          * as well as the operations usually called "nonidempotent":
1542          */
1543         OP_MODIFIES_SOMETHING = 1 << 5,
1544         /*
1545          * Cache compounds containing these ops in the xid-based drc:
1546          * We use the DRC for compounds containing non-idempotent
1547          * operations, *except* those that are 4.1-specific (since
1548          * sessions provide their own EOS), and except for stateful
1549          * operations other than setclientid and setclientid_confirm
1550          * (since sequence numbers provide EOS for open, lock, etc in
1551          * the v4.0 case).
1552          */
1553         OP_CACHEME = 1 << 6,
1554         /*
1555          * These are ops which clear current state id.
1556          */
1557         OP_CLEAR_STATEID = 1 << 7,
1558 };
1559
1560 struct nfsd4_operation {
1561         nfsd4op_func op_func;
1562         u32 op_flags;
1563         char *op_name;
1564         /* Try to get response size before operation */
1565         nfsd4op_rsize op_rsize_bop;
1566         stateid_getter op_get_currentstateid;
1567         stateid_setter op_set_currentstateid;
1568 };
1569
1570 static struct nfsd4_operation nfsd4_ops[];
1571
1572 static const char *nfsd4_op_name(unsigned opnum);
1573
1574 /*
1575  * Enforce NFSv4.1 COMPOUND ordering rules:
1576  *
1577  * Also note, enforced elsewhere:
1578  *      - SEQUENCE other than as first op results in
1579  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1580  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1581  *        (Enforced in nfsd4_bind_conn_to_session().)
1582  *      - DESTROY_SESSION must be the final operation in a compound, if
1583  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1584  *        (Enforced in nfsd4_destroy_session().)
1585  */
1586 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1587 {
1588         struct nfsd4_op *op = &args->ops[0];
1589
1590         /* These ordering requirements don't apply to NFSv4.0: */
1591         if (args->minorversion == 0)
1592                 return nfs_ok;
1593         /* This is weird, but OK, not our problem: */
1594         if (args->opcnt == 0)
1595                 return nfs_ok;
1596         if (op->status == nfserr_op_illegal)
1597                 return nfs_ok;
1598         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1599                 return nfserr_op_not_in_session;
1600         if (op->opnum == OP_SEQUENCE)
1601                 return nfs_ok;
1602         if (args->opcnt != 1)
1603                 return nfserr_not_only_op;
1604         return nfs_ok;
1605 }
1606
1607 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1608 {
1609         return &nfsd4_ops[op->opnum];
1610 }
1611
1612 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1613 {
1614         if (op->opnum == OP_ILLEGAL)
1615                 return false;
1616         return OPDESC(op)->op_flags & OP_CACHEME;
1617 }
1618
1619 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1620 {
1621         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1622         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1623         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1624         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1625         struct nfsd4_operation *thisd;
1626         struct nfsd4_operation *nextd;
1627
1628         thisd = OPDESC(this);
1629         /*
1630          * Most ops check wronsec on our own; only the putfh-like ops
1631          * have special rules.
1632          */
1633         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1634                 return false;
1635         /*
1636          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1637          * put-filehandle operation if we're not going to use the
1638          * result:
1639          */
1640         if (argp->opcnt == resp->opcnt)
1641                 return false;
1642         if (next->opnum == OP_ILLEGAL)
1643                 return false;
1644         nextd = OPDESC(next);
1645         /*
1646          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1647          * errors themselves as necessary; others should check for them
1648          * now:
1649          */
1650         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1651 }
1652
1653 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1654                                struct nfsd4_compoundres *resp)
1655 {
1656         struct xdr_stream *xdr = &resp->xdr;
1657         struct xdr_buf *buf = &rqstp->rq_res;
1658         struct kvec *head = buf->head;
1659
1660         xdr->buf = buf;
1661         xdr->iov = head;
1662         xdr->p   = head->iov_base + head->iov_len;
1663         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1664         /* Tail and page_len should be zero at this point: */
1665         buf->len = buf->head[0].iov_len;
1666         xdr->scratch.iov_len = 0;
1667         xdr->page_ptr = buf->pages - 1;
1668         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1669                 - rqstp->rq_auth_slack;
1670 }
1671
1672 /*
1673  * COMPOUND call.
1674  */
1675 static __be32
1676 nfsd4_proc_compound(struct svc_rqst *rqstp,
1677                     struct nfsd4_compoundargs *args,
1678                     struct nfsd4_compoundres *resp)
1679 {
1680         struct nfsd4_op *op;
1681         struct nfsd4_operation *opdesc;
1682         struct nfsd4_compound_state *cstate = &resp->cstate;
1683         struct svc_fh *current_fh = &cstate->current_fh;
1684         struct svc_fh *save_fh = &cstate->save_fh;
1685         __be32          status;
1686
1687         svcxdr_init_encode(rqstp, resp);
1688         resp->tagp = resp->xdr.p;
1689         /* reserve space for: taglen, tag, and opcnt */
1690         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1691         resp->taglen = args->taglen;
1692         resp->tag = args->tag;
1693         resp->rqstp = rqstp;
1694         cstate->minorversion = args->minorversion;
1695         fh_init(current_fh, NFS4_FHSIZE);
1696         fh_init(save_fh, NFS4_FHSIZE);
1697         /*
1698          * Don't use the deferral mechanism for NFSv4; compounds make it
1699          * too hard to avoid non-idempotency problems.
1700          */
1701         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1702
1703         /*
1704          * According to RFC3010, this takes precedence over all other errors.
1705          */
1706         status = nfserr_minor_vers_mismatch;
1707         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1708                 goto out;
1709
1710         status = nfs41_check_op_ordering(args);
1711         if (status) {
1712                 op = &args->ops[0];
1713                 op->status = status;
1714                 goto encode_op;
1715         }
1716
1717         while (!status && resp->opcnt < args->opcnt) {
1718                 op = &args->ops[resp->opcnt++];
1719
1720                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1721                         resp->opcnt, args->opcnt, op->opnum,
1722                         nfsd4_op_name(op->opnum));
1723                 /*
1724                  * The XDR decode routines may have pre-set op->status;
1725                  * for example, if there is a miscellaneous XDR error
1726                  * it will be set to nfserr_bad_xdr.
1727                  */
1728                 if (op->status) {
1729                         if (op->opnum == OP_OPEN)
1730                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1731                         goto encode_op;
1732                 }
1733
1734                 opdesc = OPDESC(op);
1735
1736                 if (!current_fh->fh_dentry) {
1737                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1738                                 op->status = nfserr_nofilehandle;
1739                                 goto encode_op;
1740                         }
1741                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1742                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1743                         op->status = nfserr_moved;
1744                         goto encode_op;
1745                 }
1746
1747                 fh_clear_wcc(current_fh);
1748
1749                 /* If op is non-idempotent */
1750                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1751                         /*
1752                          * Don't execute this op if we couldn't encode a
1753                          * succesful reply:
1754                          */
1755                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1756                         /*
1757                          * Plus if there's another operation, make sure
1758                          * we'll have space to at least encode an error:
1759                          */
1760                         if (resp->opcnt < args->opcnt)
1761                                 plen += COMPOUND_ERR_SLACK_SPACE;
1762                         op->status = nfsd4_check_resp_size(resp, plen);
1763                 }
1764
1765                 if (op->status)
1766                         goto encode_op;
1767
1768                 if (opdesc->op_get_currentstateid)
1769                         opdesc->op_get_currentstateid(cstate, &op->u);
1770                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1771
1772                 /* Only from SEQUENCE */
1773                 if (cstate->status == nfserr_replay_cache) {
1774                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1775                         status = op->status;
1776                         goto out;
1777                 }
1778                 if (!op->status) {
1779                         if (opdesc->op_set_currentstateid)
1780                                 opdesc->op_set_currentstateid(cstate, &op->u);
1781
1782                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1783                                 clear_current_stateid(cstate);
1784
1785                         if (need_wrongsec_check(rqstp))
1786                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1787                 }
1788 encode_op:
1789                 if (op->status == nfserr_replay_me) {
1790                         op->replay = &cstate->replay_owner->so_replay;
1791                         nfsd4_encode_replay(&resp->xdr, op);
1792                         status = op->status = op->replay->rp_status;
1793                 } else {
1794                         nfsd4_encode_operation(resp, op);
1795                         status = op->status;
1796                 }
1797
1798                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1799                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1800                         be32_to_cpu(status));
1801
1802                 nfsd4_cstate_clear_replay(cstate);
1803                 nfsd4_increment_op_stats(op->opnum);
1804         }
1805
1806         cstate->status = status;
1807         fh_put(current_fh);
1808         fh_put(save_fh);
1809         BUG_ON(cstate->replay_owner);
1810 out:
1811         /* Reset deferral mechanism for RPC deferrals */
1812         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1813         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1814         return status;
1815 }
1816
1817 #define op_encode_hdr_size              (2)
1818 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1819 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1820 #define op_encode_change_info_maxsz     (5)
1821 #define nfs4_fattr_bitmap_maxsz         (4)
1822
1823 /* We'll fall back on returning no lockowner if run out of space: */
1824 #define op_encode_lockowner_maxsz       (0)
1825 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1826
1827 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1828
1829 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1830 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1831                                          op_encode_ace_maxsz)
1832
1833 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1834
1835 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1836 {
1837         return (op_encode_hdr_size) * sizeof(__be32);
1838 }
1839
1840 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1841 {
1842         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1843 }
1844
1845 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1846 {
1847         /* ac_supported, ac_resp_access */
1848         return (op_encode_hdr_size + 2)* sizeof(__be32);
1849 }
1850
1851 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1852 {
1853         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1854 }
1855
1856 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1857 {
1858         return (op_encode_hdr_size + op_encode_change_info_maxsz
1859                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1860 }
1861
1862 /*
1863  * Note since this is an idempotent operation we won't insist on failing
1864  * the op prematurely if the estimate is too large.  We may turn off splice
1865  * reads unnecessarily.
1866  */
1867 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1868                                       struct nfsd4_op *op)
1869 {
1870         u32 *bmap = op->u.getattr.ga_bmval;
1871         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1872         u32 ret = 0;
1873
1874         if (bmap0 & FATTR4_WORD0_ACL)
1875                 return svc_max_payload(rqstp);
1876         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1877                 return svc_max_payload(rqstp);
1878
1879         if (bmap1 & FATTR4_WORD1_OWNER) {
1880                 ret += IDMAP_NAMESZ + 4;
1881                 bmap1 &= ~FATTR4_WORD1_OWNER;
1882         }
1883         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1884                 ret += IDMAP_NAMESZ + 4;
1885                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1886         }
1887         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1888                 ret += NFS4_FHSIZE + 4;
1889                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1890         }
1891         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1892                 ret += NFS4_MAXLABELLEN + 12;
1893                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1894         }
1895         /*
1896          * Largest of remaining attributes are 16 bytes (e.g.,
1897          * supported_attributes)
1898          */
1899         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1900         /* bitmask, length */
1901         ret += 20;
1902         return ret;
1903 }
1904
1905 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1906 {
1907         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1908 }
1909
1910 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1911 {
1912         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1913                 * sizeof(__be32);
1914 }
1915
1916 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1917 {
1918         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1919                 * sizeof(__be32);
1920 }
1921
1922 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1923 {
1924         return (op_encode_hdr_size + op_encode_stateid_maxsz
1925                 + op_encode_change_info_maxsz + 1
1926                 + nfs4_fattr_bitmap_maxsz
1927                 + op_encode_delegation_maxsz) * sizeof(__be32);
1928 }
1929
1930 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1931 {
1932         u32 maxcount = 0, rlen = 0;
1933
1934         maxcount = svc_max_payload(rqstp);
1935         rlen = min(op->u.read.rd_length, maxcount);
1936
1937         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1938 }
1939
1940 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1941 {
1942         u32 maxcount = 0, rlen = 0;
1943
1944         maxcount = svc_max_payload(rqstp);
1945         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1946
1947         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1948                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1949 }
1950
1951 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1952 {
1953         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1954 }
1955
1956 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1957 {
1958         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1959                 * sizeof(__be32);
1960 }
1961
1962 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1963 {
1964         return (op_encode_hdr_size + op_encode_change_info_maxsz
1965                 + op_encode_change_info_maxsz) * sizeof(__be32);
1966 }
1967
1968 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1969                                        struct nfsd4_op *op)
1970 {
1971         return (op_encode_hdr_size
1972                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1973 }
1974
1975 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1976 {
1977         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1978                 * sizeof(__be32);
1979 }
1980
1981 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1982 {
1983         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1984 }
1985
1986 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1987 {
1988         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
1989                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
1990 }
1991
1992 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1993 {
1994         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1995                                                                 sizeof(__be32);
1996 }
1997
1998 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1999 {
2000         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2001 }
2002
2003 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2004 {
2005         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2006                 1 + 1 + /* eir_flags, spr_how */\
2007                 4 + /* spo_must_enforce & _allow with bitmap */\
2008                 2 + /*eir_server_owner.so_minor_id */\
2009                 /* eir_server_owner.so_major_id<> */\
2010                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2011                 /* eir_server_scope<> */\
2012                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2013                 1 + /* eir_server_impl_id array length */\
2014                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2015 }
2016
2017 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2018 {
2019         return (op_encode_hdr_size + \
2020                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2021                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2022 }
2023
2024 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2025 {
2026         return (op_encode_hdr_size + \
2027                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2028                 2 + /* csr_sequence, csr_flags */\
2029                 op_encode_channel_attrs_maxsz + \
2030                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2031 }
2032
2033 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2034 {
2035         return (op_encode_hdr_size +
2036                 1 /* wr_callback */ +
2037                 op_encode_stateid_maxsz /* wr_callback */ +
2038                 2 /* wr_count */ +
2039                 1 /* wr_committed */ +
2040                 op_encode_verifier_maxsz +
2041                 1 /* cr_consecutive */ +
2042                 1 /* cr_synchronous */) * sizeof(__be32);
2043 }
2044
2045 #ifdef CONFIG_NFSD_PNFS
2046 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2047 {
2048         u32 maxcount = 0, rlen = 0;
2049
2050         maxcount = svc_max_payload(rqstp);
2051         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2052
2053         return (op_encode_hdr_size +
2054                 1 /* gd_layout_type*/ +
2055                 XDR_QUADLEN(rlen) +
2056                 2 /* gd_notify_types */) * sizeof(__be32);
2057 }
2058
2059 /*
2060  * At this stage we don't really know what layout driver will handle the request,
2061  * so we need to define an arbitrary upper bound here.
2062  */
2063 #define MAX_LAYOUT_SIZE         128
2064 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2065 {
2066         return (op_encode_hdr_size +
2067                 1 /* logr_return_on_close */ +
2068                 op_encode_stateid_maxsz +
2069                 1 /* nr of layouts */ +
2070                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2071 }
2072
2073 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2074 {
2075         return (op_encode_hdr_size +
2076                 1 /* locr_newsize */ +
2077                 2 /* ns_size */) * sizeof(__be32);
2078 }
2079
2080 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2081 {
2082         return (op_encode_hdr_size +
2083                 1 /* lrs_stateid */ +
2084                 op_encode_stateid_maxsz) * sizeof(__be32);
2085 }
2086 #endif /* CONFIG_NFSD_PNFS */
2087
2088
2089 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2090 {
2091         return (op_encode_hdr_size + 3) * sizeof(__be32);
2092 }
2093
2094 static struct nfsd4_operation nfsd4_ops[] = {
2095         [OP_ACCESS] = {
2096                 .op_func = (nfsd4op_func)nfsd4_access,
2097                 .op_name = "OP_ACCESS",
2098                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_access_rsize,
2099         },
2100         [OP_CLOSE] = {
2101                 .op_func = (nfsd4op_func)nfsd4_close,
2102                 .op_flags = OP_MODIFIES_SOMETHING,
2103                 .op_name = "OP_CLOSE",
2104                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2105                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
2106                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
2107         },
2108         [OP_COMMIT] = {
2109                 .op_func = (nfsd4op_func)nfsd4_commit,
2110                 .op_flags = OP_MODIFIES_SOMETHING,
2111                 .op_name = "OP_COMMIT",
2112                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
2113         },
2114         [OP_CREATE] = {
2115                 .op_func = (nfsd4op_func)nfsd4_create,
2116                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2117                 .op_name = "OP_CREATE",
2118                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
2119         },
2120         [OP_DELEGRETURN] = {
2121                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
2122                 .op_flags = OP_MODIFIES_SOMETHING,
2123                 .op_name = "OP_DELEGRETURN",
2124                 .op_rsize_bop = nfsd4_only_status_rsize,
2125                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
2126         },
2127         [OP_GETATTR] = {
2128                 .op_func = (nfsd4op_func)nfsd4_getattr,
2129                 .op_flags = ALLOWED_ON_ABSENT_FS,
2130                 .op_rsize_bop = nfsd4_getattr_rsize,
2131                 .op_name = "OP_GETATTR",
2132         },
2133         [OP_GETFH] = {
2134                 .op_func = (nfsd4op_func)nfsd4_getfh,
2135                 .op_name = "OP_GETFH",
2136                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_getfh_rsize,
2137         },
2138         [OP_LINK] = {
2139                 .op_func = (nfsd4op_func)nfsd4_link,
2140                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2141                                 | OP_CACHEME,
2142                 .op_name = "OP_LINK",
2143                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
2144         },
2145         [OP_LOCK] = {
2146                 .op_func = (nfsd4op_func)nfsd4_lock,
2147                 .op_flags = OP_MODIFIES_SOMETHING,
2148                 .op_name = "OP_LOCK",
2149                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2150                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
2151         },
2152         [OP_LOCKT] = {
2153                 .op_func = (nfsd4op_func)nfsd4_lockt,
2154                 .op_name = "OP_LOCKT",
2155                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2156         },
2157         [OP_LOCKU] = {
2158                 .op_func = (nfsd4op_func)nfsd4_locku,
2159                 .op_flags = OP_MODIFIES_SOMETHING,
2160                 .op_name = "OP_LOCKU",
2161                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2162                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
2163         },
2164         [OP_LOOKUP] = {
2165                 .op_func = (nfsd4op_func)nfsd4_lookup,
2166                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2167                 .op_name = "OP_LOOKUP",
2168                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2169         },
2170         [OP_LOOKUPP] = {
2171                 .op_func = (nfsd4op_func)nfsd4_lookupp,
2172                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2173                 .op_name = "OP_LOOKUPP",
2174                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2175         },
2176         [OP_NVERIFY] = {
2177                 .op_func = (nfsd4op_func)nfsd4_nverify,
2178                 .op_name = "OP_NVERIFY",
2179                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2180         },
2181         [OP_OPEN] = {
2182                 .op_func = (nfsd4op_func)nfsd4_open,
2183                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2184                 .op_name = "OP_OPEN",
2185                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
2186                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
2187         },
2188         [OP_OPEN_CONFIRM] = {
2189                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
2190                 .op_flags = OP_MODIFIES_SOMETHING,
2191                 .op_name = "OP_OPEN_CONFIRM",
2192                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2193         },
2194         [OP_OPEN_DOWNGRADE] = {
2195                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
2196                 .op_flags = OP_MODIFIES_SOMETHING,
2197                 .op_name = "OP_OPEN_DOWNGRADE",
2198                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2199                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
2200                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
2201         },
2202         [OP_PUTFH] = {
2203                 .op_func = (nfsd4op_func)nfsd4_putfh,
2204                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2205                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2206                 .op_name = "OP_PUTFH",
2207                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2208         },
2209         [OP_PUTPUBFH] = {
2210                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2211                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2212                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2213                 .op_name = "OP_PUTPUBFH",
2214                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2215         },
2216         [OP_PUTROOTFH] = {
2217                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2218                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2219                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2220                 .op_name = "OP_PUTROOTFH",
2221                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2222         },
2223         [OP_READ] = {
2224                 .op_func = (nfsd4op_func)nfsd4_read,
2225                 .op_name = "OP_READ",
2226                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
2227                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
2228         },
2229         [OP_READDIR] = {
2230                 .op_func = (nfsd4op_func)nfsd4_readdir,
2231                 .op_name = "OP_READDIR",
2232                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
2233         },
2234         [OP_READLINK] = {
2235                 .op_func = (nfsd4op_func)nfsd4_readlink,
2236                 .op_name = "OP_READLINK",
2237                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readlink_rsize,
2238         },
2239         [OP_REMOVE] = {
2240                 .op_func = (nfsd4op_func)nfsd4_remove,
2241                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2242                 .op_name = "OP_REMOVE",
2243                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
2244         },
2245         [OP_RENAME] = {
2246                 .op_func = (nfsd4op_func)nfsd4_rename,
2247                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2248                 .op_name = "OP_RENAME",
2249                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
2250         },
2251         [OP_RENEW] = {
2252                 .op_func = (nfsd4op_func)nfsd4_renew,
2253                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2254                                 | OP_MODIFIES_SOMETHING,
2255                 .op_name = "OP_RENEW",
2256                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2257
2258         },
2259         [OP_RESTOREFH] = {
2260                 .op_func = (nfsd4op_func)nfsd4_restorefh,
2261                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2262                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2263                 .op_name = "OP_RESTOREFH",
2264                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2265         },
2266         [OP_SAVEFH] = {
2267                 .op_func = (nfsd4op_func)nfsd4_savefh,
2268                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2269                 .op_name = "OP_SAVEFH",
2270                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2271         },
2272         [OP_SECINFO] = {
2273                 .op_func = (nfsd4op_func)nfsd4_secinfo,
2274                 .op_flags = OP_HANDLES_WRONGSEC,
2275                 .op_name = "OP_SECINFO",
2276                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_secinfo_rsize,
2277         },
2278         [OP_SETATTR] = {
2279                 .op_func = (nfsd4op_func)nfsd4_setattr,
2280                 .op_name = "OP_SETATTR",
2281                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2282                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
2283                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
2284         },
2285         [OP_SETCLIENTID] = {
2286                 .op_func = (nfsd4op_func)nfsd4_setclientid,
2287                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2288                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2289                 .op_name = "OP_SETCLIENTID",
2290                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
2291         },
2292         [OP_SETCLIENTID_CONFIRM] = {
2293                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
2294                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2295                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2296                 .op_name = "OP_SETCLIENTID_CONFIRM",
2297                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2298         },
2299         [OP_VERIFY] = {
2300                 .op_func = (nfsd4op_func)nfsd4_verify,
2301                 .op_name = "OP_VERIFY",
2302                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2303         },
2304         [OP_WRITE] = {
2305                 .op_func = (nfsd4op_func)nfsd4_write,
2306                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2307                 .op_name = "OP_WRITE",
2308                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
2309                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
2310         },
2311         [OP_RELEASE_LOCKOWNER] = {
2312                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
2313                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2314                                 | OP_MODIFIES_SOMETHING,
2315                 .op_name = "OP_RELEASE_LOCKOWNER",
2316                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2317         },
2318
2319         /* NFSv4.1 operations */
2320         [OP_EXCHANGE_ID] = {
2321                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
2322                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2323                                 | OP_MODIFIES_SOMETHING,
2324                 .op_name = "OP_EXCHANGE_ID",
2325                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
2326         },
2327         [OP_BACKCHANNEL_CTL] = {
2328                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
2329                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2330                 .op_name = "OP_BACKCHANNEL_CTL",
2331                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2332         },
2333         [OP_BIND_CONN_TO_SESSION] = {
2334                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
2335                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2336                                 | OP_MODIFIES_SOMETHING,
2337                 .op_name = "OP_BIND_CONN_TO_SESSION",
2338                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
2339         },
2340         [OP_CREATE_SESSION] = {
2341                 .op_func = (nfsd4op_func)nfsd4_create_session,
2342                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2343                                 | OP_MODIFIES_SOMETHING,
2344                 .op_name = "OP_CREATE_SESSION",
2345                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
2346         },
2347         [OP_DESTROY_SESSION] = {
2348                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
2349                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2350                                 | OP_MODIFIES_SOMETHING,
2351                 .op_name = "OP_DESTROY_SESSION",
2352                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2353         },
2354         [OP_SEQUENCE] = {
2355                 .op_func = (nfsd4op_func)nfsd4_sequence,
2356                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2357                 .op_name = "OP_SEQUENCE",
2358                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
2359         },
2360         [OP_DESTROY_CLIENTID] = {
2361                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
2362                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2363                                 | OP_MODIFIES_SOMETHING,
2364                 .op_name = "OP_DESTROY_CLIENTID",
2365                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2366         },
2367         [OP_RECLAIM_COMPLETE] = {
2368                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
2369                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2370                 .op_name = "OP_RECLAIM_COMPLETE",
2371                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2372         },
2373         [OP_SECINFO_NO_NAME] = {
2374                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
2375                 .op_flags = OP_HANDLES_WRONGSEC,
2376                 .op_name = "OP_SECINFO_NO_NAME",
2377                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_secinfo_rsize,
2378         },
2379         [OP_TEST_STATEID] = {
2380                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
2381                 .op_flags = ALLOWED_WITHOUT_FH,
2382                 .op_name = "OP_TEST_STATEID",
2383                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_test_stateid_rsize,
2384         },
2385         [OP_FREE_STATEID] = {
2386                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
2387                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2388                 .op_name = "OP_FREE_STATEID",
2389                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
2390                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2391         },
2392 #ifdef CONFIG_NFSD_PNFS
2393         [OP_GETDEVICEINFO] = {
2394                 .op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
2395                 .op_flags = ALLOWED_WITHOUT_FH,
2396                 .op_name = "OP_GETDEVICEINFO",
2397                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_getdeviceinfo_rsize,
2398         },
2399         [OP_LAYOUTGET] = {
2400                 .op_func = (nfsd4op_func)nfsd4_layoutget,
2401                 .op_flags = OP_MODIFIES_SOMETHING,
2402                 .op_name = "OP_LAYOUTGET",
2403                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutget_rsize,
2404         },
2405         [OP_LAYOUTCOMMIT] = {
2406                 .op_func = (nfsd4op_func)nfsd4_layoutcommit,
2407                 .op_flags = OP_MODIFIES_SOMETHING,
2408                 .op_name = "OP_LAYOUTCOMMIT",
2409                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutcommit_rsize,
2410         },
2411         [OP_LAYOUTRETURN] = {
2412                 .op_func = (nfsd4op_func)nfsd4_layoutreturn,
2413                 .op_flags = OP_MODIFIES_SOMETHING,
2414                 .op_name = "OP_LAYOUTRETURN",
2415                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutreturn_rsize,
2416         },
2417 #endif /* CONFIG_NFSD_PNFS */
2418
2419         /* NFSv4.2 operations */
2420         [OP_ALLOCATE] = {
2421                 .op_func = (nfsd4op_func)nfsd4_allocate,
2422                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2423                 .op_name = "OP_ALLOCATE",
2424                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2425         },
2426         [OP_DEALLOCATE] = {
2427                 .op_func = (nfsd4op_func)nfsd4_deallocate,
2428                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2429                 .op_name = "OP_DEALLOCATE",
2430                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2431         },
2432         [OP_CLONE] = {
2433                 .op_func = (nfsd4op_func)nfsd4_clone,
2434                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2435                 .op_name = "OP_CLONE",
2436                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2437         },
2438         [OP_COPY] = {
2439                 .op_func = (nfsd4op_func)nfsd4_copy,
2440                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2441                 .op_name = "OP_COPY",
2442                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_copy_rsize,
2443         },
2444         [OP_SEEK] = {
2445                 .op_func = (nfsd4op_func)nfsd4_seek,
2446                 .op_name = "OP_SEEK",
2447                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_seek_rsize,
2448         },
2449 };
2450
2451 /**
2452  * nfsd4_spo_must_allow - Determine if the compound op contains an
2453  * operation that is allowed to be sent with machine credentials
2454  *
2455  * @rqstp: a pointer to the struct svc_rqst
2456  *
2457  * Checks to see if the compound contains a spo_must_allow op
2458  * and confirms that it was sent with the proper machine creds.
2459  */
2460
2461 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2462 {
2463         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2464         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2465         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2466         struct nfsd4_compound_state *cstate = &resp->cstate;
2467         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2468         u32 opiter;
2469
2470         if (!cstate->minorversion)
2471                 return false;
2472
2473         if (cstate->spo_must_allowed == true)
2474                 return true;
2475
2476         opiter = resp->opcnt;
2477         while (opiter < argp->opcnt) {
2478                 this = &argp->ops[opiter++];
2479                 if (test_bit(this->opnum, allow->u.longs) &&
2480                         cstate->clp->cl_mach_cred &&
2481                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2482                         cstate->spo_must_allowed = true;
2483                         return true;
2484                 }
2485         }
2486         cstate->spo_must_allowed = false;
2487         return false;
2488 }
2489
2490 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2491 {
2492         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2493                 return op_encode_hdr_size * sizeof(__be32);
2494
2495         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2496         return OPDESC(op)->op_rsize_bop(rqstp, op);
2497 }
2498
2499 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2500 {
2501         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2502                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2503                         op->opnum, nfsd4_op_name(op->opnum));
2504                 WARN_ON_ONCE(1);
2505         }
2506 }
2507
2508 static const char *nfsd4_op_name(unsigned opnum)
2509 {
2510         if (opnum < ARRAY_SIZE(nfsd4_ops))
2511                 return nfsd4_ops[opnum].op_name;
2512         return "unknown_operation";
2513 }
2514
2515 #define nfsd4_voidres                   nfsd4_voidargs
2516 struct nfsd4_voidargs { int dummy; };
2517
2518 static struct svc_procedure             nfsd_procedures4[2] = {
2519         [NFSPROC4_NULL] = {
2520                 .pc_func = (svc_procfunc) nfsd4_proc_null,
2521                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2522                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2523                 .pc_ressize = sizeof(struct nfsd4_voidres),
2524                 .pc_cachetype = RC_NOCACHE,
2525                 .pc_xdrressize = 1,
2526         },
2527         [NFSPROC4_COMPOUND] = {
2528                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
2529                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2530                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2531                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2532                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2533                 .pc_release = nfsd4_release_compoundargs,
2534                 .pc_cachetype = RC_NOCACHE,
2535                 .pc_xdrressize = NFSD_BUFSIZE/4,
2536         },
2537 };
2538
2539 struct svc_version      nfsd_version4 = {
2540         .vs_vers                = 4,
2541         .vs_nproc               = 2,
2542         .vs_proc                = nfsd_procedures4,
2543         .vs_dispatch            = nfsd_dispatch,
2544         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2545         .vs_rpcb_optnl          = true,
2546         .vs_need_cong_ctrl      = true,
2547 };
2548
2549 /*
2550  * Local variables:
2551  *  c-basic-offset: 8
2552  * End:
2553  */