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
  99         /*
 100          * Check about attributes are supported by the NFSv4 server or not.
 101          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
 102          */
 103         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 104             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 105             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 106                 return nfserr_attrnotsupp;
 107
 108         /*
 109          * Check FATTR4_WORD0_ACL can be supported
 110          * in current environment or not.
 111          */
 112         if (bmval[0] & FATTR4_WORD0_ACL) {
 113                 if (!IS_POSIXACL(d_inode(dentry)))
 114                         return nfserr_attrnotsupp;
 115         }
 116
 117         /*
 118          * According to spec, read-only attributes return ERR_INVAL.
 119          */
 120         if (writable) {
 121                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 122                     (bmval[2] & ~writable[2]))
 123                         return nfserr_inval;
 124         }
 125
 126         return nfs_ok;
 127 }
 128
 129 static __be32
 130 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 131         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 132 {
 133         __be32 status = nfs_ok;
 134
 135         if (open->op_create == NFS4_OPEN_CREATE) {
 136                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 137                     || open->op_createmode == NFS4_CREATE_GUARDED)
 138                         status = check_attr_support(rqstp, cstate,
 139                                         open->op_bmval, nfsd_attrmask);
 140                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 141                         status = check_attr_support(rqstp, cstate,
 142                                         open->op_bmval, nfsd41_ex_attrmask);
 143         }
 144
 145         return status;
 146 }
 147
 148 static int
 149 is_create_with_attrs(struct nfsd4_open *open)
 150 {
 151         return open->op_create == NFS4_OPEN_CREATE
 152                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 153                     || open->op_createmode == NFS4_CREATE_GUARDED
 154                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 155 }
 156
 157 /*
 158  * if error occurs when setting the acl, just clear the acl bit
 159  * in the returned attr bitmap.
 160  */
 161 static void
 162 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 163                 struct nfs4_acl *acl, u32 *bmval)
 164 {
 165         __be32 status;
 166
 167         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 168         if (status)
 169                 /*
 170                  * We should probably fail the whole open at this point,
 171                  * but we've already created the file, so it's too late;
 172                  * So this seems the least of evils:
 173                  */
 174                 bmval[0] &= ~FATTR4_WORD0_ACL;
 175 }
 176
 177 static inline void
 178 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 179 {
 180         fh_put(dst);
 181         dget(src->fh_dentry);
 182         if (src->fh_export)
 183                 exp_get(src->fh_export);
 184         *dst = *src;
 185 }
 186
 187 static __be32
 188 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 189 {
 190         __be32 status;
 191
 192         if (open->op_truncate &&
 193                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 194                 return nfserr_inval;
 195
 196         accmode |= NFSD_MAY_READ_IF_EXEC;
 197
 198         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 199                 accmode |= NFSD_MAY_READ;
 200         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 201                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 202         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 203                 accmode |= NFSD_MAY_WRITE;
 204
 205         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 206
 207         return status;
 208 }
 209
 210 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 211 {
 212         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 213
 214         if (S_ISREG(mode))
 215                 return nfs_ok;
 216         if (S_ISDIR(mode))
 217                 return nfserr_isdir;
 218         /*
 219          * Using err_symlink as our catch-all case may look odd; but
 220          * there's no other obvious error for this case in 4.0, and we
 221          * happen to know that it will cause the linux v4 client to do
 222          * the right thing on attempts to open something other than a
 223          * regular file.
 224          */
 225         return nfserr_symlink;
 226 }
 227
 228 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 229 {
 230         if (nfsd4_has_session(cstate))
 231                 return;
 232         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 233                         &resfh->fh_handle);
 234 }
 235
 236 static __be32
 237 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 238 {
 239         struct svc_fh *current_fh = &cstate->current_fh;
 240         int accmode;
 241         __be32 status;
 242
 243         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 244         if (!*resfh)
 245                 return nfserr_jukebox;
 246         fh_init(*resfh, NFS4_FHSIZE);
 247         open->op_truncate = 0;
 248
 249         if (open->op_create) {
 250                 /* FIXME: check session persistence and pnfs flags.
 251                  * The nfsv4.1 spec requires the following semantics:
 252                  *
 253                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 254                  * Reply Cache  | server |                 |
 255                  * -------------+--------+-----------------+--------------------
 256                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 257                  *              |        |                 | (SHOULD)
 258                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 259                  *              |        |                 | (SHOULD NOT)
 260                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 261                  * yes          | no     | GUARDED4        | GUARDED4
 262                  * yes          | yes    | GUARDED4        | GUARDED4
 263                  */
 264
 265                 /*
 266                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 267                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 268                  */
 269                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 270                                         open->op_fname.len, &open->op_iattr,
 271                                         *resfh, open->op_createmode,
 272                                         (u32 *)open->op_verf.data,
 273                                         &open->op_truncate, &open->op_created);
 274
 275                 if (!status && open->op_label.len)
 276                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 277
 278                 /*
 279                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 280                  * use the returned bitmask to indicate which attributes
 281                  * we used to store the verifier:
 282                  */
 283                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 284                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 285                                                 FATTR4_WORD1_TIME_MODIFY);
 286         } else
 287                 /*
 288                  * Note this may exit with the parent still locked.
 289                  * We will hold the lock until nfsd4_open's final
 290                  * lookup, to prevent renames or unlinks until we've had
 291                  * a chance to an acquire a delegation if appropriate.
 292                  */
 293                 status = nfsd_lookup(rqstp, current_fh,
 294                                      open->op_fname.data, open->op_fname.len, *resfh);
 295         if (status)
 296                 goto out;
 297         status = nfsd_check_obj_isreg(*resfh);
 298         if (status)
 299                 goto out;
 300
 301         if (is_create_with_attrs(open) && open->op_acl != NULL)
 302                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 303
 304         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 305         accmode = NFSD_MAY_NOP;
 306         if (open->op_created ||
 307                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 308                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 309         status = do_open_permission(rqstp, *resfh, open, accmode);
 310         set_change_info(&open->op_cinfo, current_fh);
 311 out:
 312         return status;
 313 }
 314
 315 static __be32
 316 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 317 {
 318         struct svc_fh *current_fh = &cstate->current_fh;
 319         __be32 status;
 320         int accmode = 0;
 321
 322         /* We don't know the target directory, and therefore can not
 323         * set the change info
 324         */
 325
 326         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 327
 328         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 329
 330         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 331                 (open->op_iattr.ia_size == 0);
 332         /*
 333          * In the delegation case, the client is telling us about an
 334          * open that it *already* performed locally, some time ago.  We
 335          * should let it succeed now if possible.
 336          *
 337          * In the case of a CLAIM_FH open, on the other hand, the client
 338          * may be counting on us to enforce permissions (the Linux 4.1
 339          * client uses this for normal opens, for example).
 340          */
 341         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 342                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 343
 344         status = do_open_permission(rqstp, current_fh, open, accmode);
 345
 346         return status;
 347 }
 348
 349 static void
 350 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 351 {
 352         struct nfsd4_sessionid *sid =
 353                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 354
 355         clid->cl_boot = sid->clientid.cl_boot;
 356         clid->cl_id = sid->clientid.cl_id;
 357 }
 358
 359 static __be32
 360 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 361            struct nfsd4_open *open)
 362 {
 363         __be32 status;
 364         struct svc_fh *resfh = NULL;
 365         struct net *net = SVC_NET(rqstp);
 366         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 367
 368         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 369                 (int)open->op_fname.len, open->op_fname.data,
 370                 open->op_openowner);
 371
 372         /* This check required by spec. */
 373         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 374                 return nfserr_inval;
 375
 376         open->op_created = 0;
 377         /*
 378          * RFC5661 18.51.3
 379          * Before RECLAIM_COMPLETE done, server should deny new lock
 380          */
 381         if (nfsd4_has_session(cstate) &&
 382             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 383                       &cstate->session->se_client->cl_flags) &&
 384             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 385                 return nfserr_grace;
 386
 387         if (nfsd4_has_session(cstate))
 388                 copy_clientid(&open->op_clientid, cstate->session);
 389
 390         /* check seqid for replay. set nfs4_owner */
 391         status = nfsd4_process_open1(cstate, open, nn);
 392         if (status == nfserr_replay_me) {
 393                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 394                 fh_put(&cstate->current_fh);
 395                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 396                                 &rp->rp_openfh);
 397                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 398                 if (status)
 399                         dprintk("nfsd4_open: replay failed"
 400                                 " restoring previous filehandle\n");
 401                 else
 402                         status = nfserr_replay_me;
 403         }
 404         if (status)
 405                 goto out;
 406         if (open->op_xdr_error) {
 407                 status = open->op_xdr_error;
 408                 goto out;
 409         }
 410
 411         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 412         if (status)
 413                 goto out;
 414
 415         /* Openowner is now set, so sequence id will get bumped.  Now we need
 416          * these checks before we do any creates: */
 417         status = nfserr_grace;
 418         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 419                 goto out;
 420         status = nfserr_no_grace;
 421         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 422                 goto out;
 423
 424         switch (open->op_claim_type) {
 425                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 426                 case NFS4_OPEN_CLAIM_NULL:
 427                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 428                         if (status)
 429                                 goto out;
 430                         break;
 431                 case NFS4_OPEN_CLAIM_PREVIOUS:
 432                         status = nfs4_check_open_reclaim(&open->op_clientid,
 433                                                          cstate, nn);
 434                         if (status)
 435                                 goto out;
 436                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 437                 case NFS4_OPEN_CLAIM_FH:
 438                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 439                         status = do_open_fhandle(rqstp, cstate, open);
 440                         if (status)
 441                                 goto out;
 442                         resfh = &cstate->current_fh;
 443                         break;
 444                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 445                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 446                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 447                                 open->op_claim_type);
 448                         status = nfserr_notsupp;
 449                         goto out;
 450                 default:
 451                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 452                                 open->op_claim_type);
 453                         status = nfserr_inval;
 454                         goto out;
 455         }
 456         /*
 457          * nfsd4_process_open2() does the actual opening of the file.  If
 458          * successful, it (1) truncates the file if open->op_truncate was
 459          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 460          */
 461         status = nfsd4_process_open2(rqstp, resfh, open);
 462         WARN(status && open->op_created,
 463              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 464              be32_to_cpu(status));
 465 out:
 466         if (resfh && resfh != &cstate->current_fh) {
 467                 fh_dup2(&cstate->current_fh, resfh);
 468                 fh_put(resfh);
 469                 kfree(resfh);
 470         }
 471         nfsd4_cleanup_open_state(cstate, open);
 472         nfsd4_bump_seqid(cstate, status);
 473         return status;
 474 }
 475
 476 /*
 477  * OPEN is the only seqid-mutating operation whose decoding can fail
 478  * with a seqid-mutating error (specifically, decoding of user names in
 479  * the attributes).  Therefore we have to do some processing to look up
 480  * the stateowner so that we can bump the seqid.
 481  */
 482 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 483 {
 484         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 485
 486         if (!seqid_mutating_err(ntohl(op->status)))
 487                 return op->status;
 488         if (nfsd4_has_session(cstate))
 489                 return op->status;
 490         open->op_xdr_error = op->status;
 491         return nfsd4_open(rqstp, cstate, open);
 492 }
 493
 494 /*
 495  * filehandle-manipulating ops.
 496  */
 497 static __be32
 498 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 499             struct svc_fh **getfh)
 500 {
 501         if (!cstate->current_fh.fh_dentry)
 502                 return nfserr_nofilehandle;
 503
 504         *getfh = &cstate->current_fh;
 505         return nfs_ok;
 506 }
 507
 508 static __be32
 509 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510             struct nfsd4_putfh *putfh)
 511 {
 512         fh_put(&cstate->current_fh);
 513         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 514         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 515                putfh->pf_fhlen);
 516         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 517 }
 518
 519 static __be32
 520 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 521                 void *arg)
 522 {
 523         __be32 status;
 524
 525         fh_put(&cstate->current_fh);
 526         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 527         return status;
 528 }
 529
 530 static __be32
 531 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 532                 void *arg)
 533 {
 534         if (!cstate->save_fh.fh_dentry)
 535                 return nfserr_restorefh;
 536
 537         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 538         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 539                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 540                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 541         }
 542         return nfs_ok;
 543 }
 544
 545 static __be32
 546 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 547              void *arg)
 548 {
 549         if (!cstate->current_fh.fh_dentry)
 550                 return nfserr_nofilehandle;
 551
 552         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 553         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 554                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 555                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 556         }
 557         return nfs_ok;
 558 }
 559
 560 /*
 561  * misc nfsv4 ops
 562  */
 563 static __be32
 564 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 565              struct nfsd4_access *access)
 566 {
 567         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 568                 return nfserr_inval;
 569
 570         access->ac_resp_access = access->ac_req_access;
 571         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 572                            &access->ac_supported);
 573 }
 574
 575 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 576 {
 577         __be32 verf[2];
 578         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 579
 580         /*
 581          * This is opaque to client, so no need to byte-swap. Use
 582          * __force to keep sparse happy
 583          */
 584         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 585         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 586         memcpy(verifier->data, verf, sizeof(verifier->data));
 587 }
 588
 589 static __be32
 590 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 591              struct nfsd4_commit *commit)
 592 {
 593         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 594         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 595                              commit->co_count);
 596 }
 597
 598 static __be32
 599 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600              struct nfsd4_create *create)
 601 {
 602         struct svc_fh resfh;
 603         __be32 status;
 604         dev_t rdev;
 605
 606         fh_init(&resfh, NFS4_FHSIZE);
 607
 608         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 609         if (status)
 610                 return status;
 611
 612         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 613                                     nfsd_attrmask);
 614         if (status)
 615                 return status;
 616
 617         switch (create->cr_type) {
 618         case NF4LNK:
 619                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 620                                       create->cr_name, create->cr_namelen,
 621                                       create->cr_data, &resfh);
 622                 break;
 623
 624         case NF4BLK:
 625                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 626                 if (MAJOR(rdev) != create->cr_specdata1 ||
 627                     MINOR(rdev) != create->cr_specdata2)
 628                         return nfserr_inval;
 629                 status = nfsd_create(rqstp, &cstate->current_fh,
 630                                      create->cr_name, create->cr_namelen,
 631                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 632                 break;
 633
 634         case NF4CHR:
 635                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 636                 if (MAJOR(rdev) != create->cr_specdata1 ||
 637                     MINOR(rdev) != create->cr_specdata2)
 638                         return nfserr_inval;
 639                 status = nfsd_create(rqstp, &cstate->current_fh,
 640                                      create->cr_name, create->cr_namelen,
 641                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 642                 break;
 643
 644         case NF4SOCK:
 645                 status = nfsd_create(rqstp, &cstate->current_fh,
 646                                      create->cr_name, create->cr_namelen,
 647                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 648                 break;
 649
 650         case NF4FIFO:
 651                 status = nfsd_create(rqstp, &cstate->current_fh,
 652                                      create->cr_name, create->cr_namelen,
 653                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 654                 break;
 655
 656         case NF4DIR:
 657                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 658                 status = nfsd_create(rqstp, &cstate->current_fh,
 659                                      create->cr_name, create->cr_namelen,
 660                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 661                 break;
 662
 663         default:
 664                 status = nfserr_badtype;
 665         }
 666
 667         if (status)
 668                 goto out;
 669
 670         if (create->cr_label.len)
 671                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 672
 673         if (create->cr_acl != NULL)
 674                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 675                                 create->cr_bmval);
 676
 677         fh_unlock(&cstate->current_fh);
 678         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 679         fh_dup2(&cstate->current_fh, &resfh);
 680 out:
 681         fh_put(&resfh);
 682         return status;
 683 }
 684
 685 static __be32
 686 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 687               struct nfsd4_getattr *getattr)
 688 {
 689         __be32 status;
 690
 691         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 692         if (status)
 693                 return status;
 694
 695         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 696                 return nfserr_inval;
 697
 698         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 699         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 700         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 701
 702         getattr->ga_fhp = &cstate->current_fh;
 703         return nfs_ok;
 704 }
 705
 706 static __be32
 707 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 708            struct nfsd4_link *link)
 709 {
 710         __be32 status = nfserr_nofilehandle;
 711
 712         if (!cstate->save_fh.fh_dentry)
 713                 return status;
 714         status = nfsd_link(rqstp, &cstate->current_fh,
 715                            link->li_name, link->li_namelen, &cstate->save_fh);
 716         if (!status)
 717                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 718         return status;
 719 }
 720
 721 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 722 {
 723         struct svc_fh tmp_fh;
 724         __be32 ret;
 725
 726         fh_init(&tmp_fh, NFS4_FHSIZE);
 727         ret = exp_pseudoroot(rqstp, &tmp_fh);
 728         if (ret)
 729                 return ret;
 730         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 731                 fh_put(&tmp_fh);
 732                 return nfserr_noent;
 733         }
 734         fh_put(&tmp_fh);
 735         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 736 }
 737
 738 static __be32
 739 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 740               void *arg)
 741 {
 742         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 743 }
 744
 745 static __be32
 746 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 747              struct nfsd4_lookup *lookup)
 748 {
 749         return nfsd_lookup(rqstp, &cstate->current_fh,
 750                            lookup->lo_name, lookup->lo_len,
 751                            &cstate->current_fh);
 752 }
 753
 754 static __be32
 755 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 756            struct nfsd4_read *read)
 757 {
 758         __be32 status;
 759
 760         read->rd_filp = NULL;
 761         if (read->rd_offset >= OFFSET_MAX)
 762                 return nfserr_inval;
 763
 764         /*
 765          * If we do a zero copy read, then a client will see read data
 766          * that reflects the state of the file *after* performing the
 767          * following compound.
 768          *
 769          * To ensure proper ordering, we therefore turn off zero copy if
 770          * the client wants us to do more in this compound:
 771          */
 772         if (!nfsd4_last_compound_op(rqstp))
 773                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 774
 775         /* check stateid */
 776         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 777                                         &read->rd_stateid, RD_STATE,
 778                                         &read->rd_filp, &read->rd_tmp_file);
 779         if (status) {
 780                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 781                 goto out;
 782         }
 783         status = nfs_ok;
 784 out:
 785         read->rd_rqstp = rqstp;
 786         read->rd_fhp = &cstate->current_fh;
 787         return status;
 788 }
 789
 790 static __be32
 791 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 792               struct nfsd4_readdir *readdir)
 793 {
 794         u64 cookie = readdir->rd_cookie;
 795         static const nfs4_verifier zeroverf;
 796
 797         /* no need to check permission - this will be done in nfsd_readdir() */
 798
 799         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 800                 return nfserr_inval;
 801
 802         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 803         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 804         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 805
 806         if ((cookie == 1) || (cookie == 2) ||
 807             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 808                 return nfserr_bad_cookie;
 809
 810         readdir->rd_rqstp = rqstp;
 811         readdir->rd_fhp = &cstate->current_fh;
 812         return nfs_ok;
 813 }
 814
 815 static __be32
 816 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 817                struct nfsd4_readlink *readlink)
 818 {
 819         readlink->rl_rqstp = rqstp;
 820         readlink->rl_fhp = &cstate->current_fh;
 821         return nfs_ok;
 822 }
 823
 824 static __be32
 825 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 826              struct nfsd4_remove *remove)
 827 {
 828         __be32 status;
 829
 830         if (opens_in_grace(SVC_NET(rqstp)))
 831                 return nfserr_grace;
 832         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 833                              remove->rm_name, remove->rm_namelen);
 834         if (!status) {
 835                 fh_unlock(&cstate->current_fh);
 836                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 837         }
 838         return status;
 839 }
 840
 841 static __be32
 842 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 843              struct nfsd4_rename *rename)
 844 {
 845         __be32 status = nfserr_nofilehandle;
 846
 847         if (!cstate->save_fh.fh_dentry)
 848                 return status;
 849         if (opens_in_grace(SVC_NET(rqstp)) &&
 850                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 851                 return nfserr_grace;
 852         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 853                              rename->rn_snamelen, &cstate->current_fh,
 854                              rename->rn_tname, rename->rn_tnamelen);
 855         if (status)
 856                 return status;
 857         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 858         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 859         return nfs_ok;
 860 }
 861
 862 static __be32
 863 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 864               struct nfsd4_secinfo *secinfo)
 865 {
 866         struct svc_export *exp;
 867         struct dentry *dentry;
 868         __be32 err;
 869
 870         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 871         if (err)
 872                 return err;
 873         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 874                                     secinfo->si_name, secinfo->si_namelen,
 875                                     &exp, &dentry);
 876         if (err)
 877                 return err;
 878         fh_unlock(&cstate->current_fh);
 879         if (d_really_is_negative(dentry)) {
 880                 exp_put(exp);
 881                 err = nfserr_noent;
 882         } else
 883                 secinfo->si_exp = exp;
 884         dput(dentry);
 885         if (cstate->minorversion)
 886                 /* See rfc 5661 section 2.6.3.1.1.8 */
 887                 fh_put(&cstate->current_fh);
 888         return err;
 889 }
 890
 891 static __be32
 892 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 893               struct nfsd4_secinfo_no_name *sin)
 894 {
 895         __be32 err;
 896
 897         switch (sin->sin_style) {
 898         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 899                 break;
 900         case NFS4_SECINFO_STYLE4_PARENT:
 901                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 902                 if (err)
 903                         return err;
 904                 break;
 905         default:
 906                 return nfserr_inval;
 907         }
 908
 909         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 910         fh_put(&cstate->current_fh);
 911         return nfs_ok;
 912 }
 913
 914 static __be32
 915 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 916               struct nfsd4_setattr *setattr)
 917 {
 918         __be32 status = nfs_ok;
 919         int err;
 920
 921         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 922                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 923                                 &cstate->current_fh, &setattr->sa_stateid,
 924                                 WR_STATE, NULL, NULL);
 925                 if (status) {
 926                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 927                         return status;
 928                 }
 929         }
 930         err = fh_want_write(&cstate->current_fh);
 931         if (err)
 932                 return nfserrno(err);
 933         status = nfs_ok;
 934
 935         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 936                                     nfsd_attrmask);
 937         if (status)
 938                 goto out;
 939
 940         if (setattr->sa_acl != NULL)
 941                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 942                                             setattr->sa_acl);
 943         if (status)
 944                 goto out;
 945         if (setattr->sa_label.len)
 946                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 947                                 &setattr->sa_label);
 948         if (status)
 949                 goto out;
 950         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 951                                 0, (time_t)0);
 952 out:
 953         fh_drop_write(&cstate->current_fh);
 954         return status;
 955 }
 956
 957 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 958 {
 959         int i = 1;
 960         int buflen = write->wr_buflen;
 961
 962         vec[0].iov_base = write->wr_head.iov_base;
 963         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 964         buflen -= vec[0].iov_len;
 965
 966         while (buflen) {
 967                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 968                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 969                 buflen -= vec[i].iov_len;
 970                 i++;
 971         }
 972         return i;
 973 }
 974
 975 static __be32
 976 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 977             struct nfsd4_write *write)
 978 {
 979         stateid_t *stateid = &write->wr_stateid;
 980         struct file *filp = NULL;
 981         __be32 status = nfs_ok;
 982         unsigned long cnt;
 983         int nvecs;
 984
 985         if (write->wr_offset >= OFFSET_MAX)
 986                 return nfserr_inval;
 987
 988         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 989                                                 stateid, WR_STATE, &filp, NULL);
 990         if (status) {
 991                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 992                 return status;
 993         }
 994
 995         cnt = write->wr_buflen;
 996         write->wr_how_written = write->wr_stable_how;
 997         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
 998
 999         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1000         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1001
1002         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1003                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1004                                 &write->wr_how_written);
1005         fput(filp);
1006
1007         write->wr_bytes_written = cnt;
1008
1009         return status;
1010 }
1011
1012 static __be32
1013 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1014                 struct nfsd4_clone *clone)
1015 {
1016         struct file *src, *dst;
1017         __be32 status;
1018
1019         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1020                                             &clone->cl_src_stateid, RD_STATE,
1021                                             &src, NULL);
1022         if (status) {
1023                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1024                 goto out;
1025         }
1026
1027         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1028                                             &clone->cl_dst_stateid, WR_STATE,
1029                                             &dst, NULL);
1030         if (status) {
1031                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1032                 goto out_put_src;
1033         }
1034
1035         /* fix up for NFS-specific error code */
1036         if (!S_ISREG(file_inode(src)->i_mode) ||
1037             !S_ISREG(file_inode(dst)->i_mode)) {
1038                 status = nfserr_wrong_type;
1039                 goto out_put_dst;
1040         }
1041
1042         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1043                         dst, clone->cl_dst_pos, clone->cl_count);
1044
1045 out_put_dst:
1046         fput(dst);
1047 out_put_src:
1048         fput(src);
1049 out:
1050         return status;
1051 }
1052
1053 static __be32
1054 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1055                 struct nfsd4_fallocate *fallocate, int flags)
1056 {
1057         __be32 status = nfserr_notsupp;
1058         struct file *file;
1059
1060         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1061                                             &fallocate->falloc_stateid,
1062                                             WR_STATE, &file, NULL);
1063         if (status != nfs_ok) {
1064                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1065                 return status;
1066         }
1067
1068         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1069                                      fallocate->falloc_offset,
1070                                      fallocate->falloc_length,
1071                                      flags);
1072         fput(file);
1073         return status;
1074 }
1075
1076 static __be32
1077 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1078                struct nfsd4_fallocate *fallocate)
1079 {
1080         return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1081 }
1082
1083 static __be32
1084 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1085                  struct nfsd4_fallocate *fallocate)
1086 {
1087         return nfsd4_fallocate(rqstp, cstate, fallocate,
1088                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1089 }
1090
1091 static __be32
1092 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1093                 struct nfsd4_seek *seek)
1094 {
1095         int whence;
1096         __be32 status;
1097         struct file *file;
1098
1099         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1100                                             &seek->seek_stateid,
1101                                             RD_STATE, &file, NULL);
1102         if (status) {
1103                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1104                 return status;
1105         }
1106
1107         switch (seek->seek_whence) {
1108         case NFS4_CONTENT_DATA:
1109                 whence = SEEK_DATA;
1110                 break;
1111         case NFS4_CONTENT_HOLE:
1112                 whence = SEEK_HOLE;
1113                 break;
1114         default:
1115                 status = nfserr_union_notsupp;
1116                 goto out;
1117         }
1118
1119         /*
1120          * Note:  This call does change file->f_pos, but nothing in NFSD
1121          *        should ever file->f_pos.
1122          */
1123         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1124         if (seek->seek_pos < 0)
1125                 status = nfserrno(seek->seek_pos);
1126         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1127                 seek->seek_eof = true;
1128
1129 out:
1130         fput(file);
1131         return status;
1132 }
1133
1134 /* This routine never returns NFS_OK!  If there are no other errors, it
1135  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1136  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1137  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1138  */
1139 static __be32
1140 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1141              struct nfsd4_verify *verify)
1142 {
1143         __be32 *buf, *p;
1144         int count;
1145         __be32 status;
1146
1147         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1148         if (status)
1149                 return status;
1150
1151         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1152         if (status)
1153                 return status;
1154
1155         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1156             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1157                 return nfserr_inval;
1158         if (verify->ve_attrlen & 3)
1159                 return nfserr_inval;
1160
1161         /* count in words:
1162          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1163          */
1164         count = 4 + (verify->ve_attrlen >> 2);
1165         buf = kmalloc(count << 2, GFP_KERNEL);
1166         if (!buf)
1167                 return nfserr_jukebox;
1168
1169         p = buf;
1170         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1171                                     cstate->current_fh.fh_export,
1172                                     cstate->current_fh.fh_dentry,
1173                                     verify->ve_bmval,
1174                                     rqstp, 0);
1175         /*
1176          * If nfsd4_encode_fattr() ran out of space, assume that's because
1177          * the attributes are longer (hence different) than those given:
1178          */
1179         if (status == nfserr_resource)
1180                 status = nfserr_not_same;
1181         if (status)
1182                 goto out_kfree;
1183
1184         /* skip bitmap */
1185         p = buf + 1 + ntohl(buf[0]);
1186         status = nfserr_not_same;
1187         if (ntohl(*p++) != verify->ve_attrlen)
1188                 goto out_kfree;
1189         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1190                 status = nfserr_same;
1191
1192 out_kfree:
1193         kfree(buf);
1194         return status;
1195 }
1196
1197 static __be32
1198 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1199               struct nfsd4_verify *verify)
1200 {
1201         __be32 status;
1202
1203         status = _nfsd4_verify(rqstp, cstate, verify);
1204         return status == nfserr_not_same ? nfs_ok : status;
1205 }
1206
1207 static __be32
1208 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1209              struct nfsd4_verify *verify)
1210 {
1211         __be32 status;
1212
1213         status = _nfsd4_verify(rqstp, cstate, verify);
1214         return status == nfserr_same ? nfs_ok : status;
1215 }
1216
1217 #ifdef CONFIG_NFSD_PNFS
1218 static const struct nfsd4_layout_ops *
1219 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1220 {
1221         if (!exp->ex_layout_types) {
1222                 dprintk("%s: export does not support pNFS\n", __func__);
1223                 return NULL;
1224         }
1225
1226         if (!(exp->ex_layout_types & (1 << layout_type))) {
1227                 dprintk("%s: layout type %d not supported\n",
1228                         __func__, layout_type);
1229                 return NULL;
1230         }
1231
1232         return nfsd4_layout_ops[layout_type];
1233 }
1234
1235 static __be32
1236 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1237                 struct nfsd4_compound_state *cstate,
1238                 struct nfsd4_getdeviceinfo *gdp)
1239 {
1240         const struct nfsd4_layout_ops *ops;
1241         struct nfsd4_deviceid_map *map;
1242         struct svc_export *exp;
1243         __be32 nfserr;
1244
1245         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1246                __func__,
1247                gdp->gd_layout_type,
1248                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1249                gdp->gd_maxcount);
1250
1251         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1252         if (!map) {
1253                 dprintk("%s: couldn't find device ID to export mapping!\n",
1254                         __func__);
1255                 return nfserr_noent;
1256         }
1257
1258         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1259         if (IS_ERR(exp)) {
1260                 dprintk("%s: could not find device id\n", __func__);
1261                 return nfserr_noent;
1262         }
1263
1264         nfserr = nfserr_layoutunavailable;
1265         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1266         if (!ops)
1267                 goto out;
1268
1269         nfserr = nfs_ok;
1270         if (gdp->gd_maxcount != 0) {
1271                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1272                                 rqstp, cstate->session->se_client, gdp);
1273         }
1274
1275         gdp->gd_notify_types &= ops->notify_types;
1276 out:
1277         exp_put(exp);
1278         return nfserr;
1279 }
1280
1281 static __be32
1282 nfsd4_layoutget(struct svc_rqst *rqstp,
1283                 struct nfsd4_compound_state *cstate,
1284                 struct nfsd4_layoutget *lgp)
1285 {
1286         struct svc_fh *current_fh = &cstate->current_fh;
1287         const struct nfsd4_layout_ops *ops;
1288         struct nfs4_layout_stateid *ls;
1289         __be32 nfserr;
1290         int accmode;
1291
1292         switch (lgp->lg_seg.iomode) {
1293         case IOMODE_READ:
1294                 accmode = NFSD_MAY_READ;
1295                 break;
1296         case IOMODE_RW:
1297                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1298                 break;
1299         default:
1300                 dprintk("%s: invalid iomode %d\n",
1301                         __func__, lgp->lg_seg.iomode);
1302                 nfserr = nfserr_badiomode;
1303                 goto out;
1304         }
1305
1306         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1307         if (nfserr)
1308                 goto out;
1309
1310         nfserr = nfserr_layoutunavailable;
1311         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1312         if (!ops)
1313                 goto out;
1314
1315         /*
1316          * Verify minlength and range as per RFC5661:
1317          *  o  If loga_length is less than loga_minlength,
1318          *     the metadata server MUST return NFS4ERR_INVAL.
1319          *  o  If the sum of loga_offset and loga_minlength exceeds
1320          *     NFS4_UINT64_MAX, and loga_minlength is not
1321          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1322          *  o  If the sum of loga_offset and loga_length exceeds
1323          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1324          *     the error NFS4ERR_INVAL MUST result.
1325          */
1326         nfserr = nfserr_inval;
1327         if (lgp->lg_seg.length < lgp->lg_minlength ||
1328             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1329              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1330             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1331              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1332                 goto out;
1333         if (lgp->lg_seg.length == 0)
1334                 goto out;
1335
1336         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1337                                                 true, lgp->lg_layout_type, &ls);
1338         if (nfserr) {
1339                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1340                 goto out;
1341         }
1342
1343         nfserr = nfserr_recallconflict;
1344         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1345                 goto out_put_stid;
1346
1347         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1348                                      current_fh, lgp);
1349         if (nfserr)
1350                 goto out_put_stid;
1351
1352         nfserr = nfsd4_insert_layout(lgp, ls);
1353
1354 out_put_stid:
1355         mutex_unlock(&ls->ls_mutex);
1356         nfs4_put_stid(&ls->ls_stid);
1357 out:
1358         return nfserr;
1359 }
1360
1361 static __be32
1362 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1363                 struct nfsd4_compound_state *cstate,
1364                 struct nfsd4_layoutcommit *lcp)
1365 {
1366         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1367         struct svc_fh *current_fh = &cstate->current_fh;
1368         const struct nfsd4_layout_ops *ops;
1369         loff_t new_size = lcp->lc_last_wr + 1;
1370         struct inode *inode;
1371         struct nfs4_layout_stateid *ls;
1372         __be32 nfserr;
1373
1374         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1375         if (nfserr)
1376                 goto out;
1377
1378         nfserr = nfserr_layoutunavailable;
1379         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1380         if (!ops)
1381                 goto out;
1382         inode = d_inode(current_fh->fh_dentry);
1383
1384         nfserr = nfserr_inval;
1385         if (new_size <= seg->offset) {
1386                 dprintk("pnfsd: last write before layout segment\n");
1387                 goto out;
1388         }
1389         if (new_size > seg->offset + seg->length) {
1390                 dprintk("pnfsd: last write beyond layout segment\n");
1391                 goto out;
1392         }
1393         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1394                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1395                 goto out;
1396         }
1397
1398         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1399                                                 false, lcp->lc_layout_type,
1400                                                 &ls);
1401         if (nfserr) {
1402                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1403                 /* fixup error code as per RFC5661 */
1404                 if (nfserr == nfserr_bad_stateid)
1405                         nfserr = nfserr_badlayout;
1406                 goto out;
1407         }
1408
1409         /* LAYOUTCOMMIT does not require any serialization */
1410         mutex_unlock(&ls->ls_mutex);
1411
1412         if (new_size > i_size_read(inode)) {
1413                 lcp->lc_size_chg = 1;
1414                 lcp->lc_newsize = new_size;
1415         } else {
1416                 lcp->lc_size_chg = 0;
1417         }
1418
1419         nfserr = ops->proc_layoutcommit(inode, lcp);
1420         nfs4_put_stid(&ls->ls_stid);
1421 out:
1422         return nfserr;
1423 }
1424
1425 static __be32
1426 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1427                 struct nfsd4_compound_state *cstate,
1428                 struct nfsd4_layoutreturn *lrp)
1429 {
1430         struct svc_fh *current_fh = &cstate->current_fh;
1431         __be32 nfserr;
1432
1433         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1434         if (nfserr)
1435                 goto out;
1436
1437         nfserr = nfserr_layoutunavailable;
1438         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1439                 goto out;
1440
1441         switch (lrp->lr_seg.iomode) {
1442         case IOMODE_READ:
1443         case IOMODE_RW:
1444         case IOMODE_ANY:
1445                 break;
1446         default:
1447                 dprintk("%s: invalid iomode %d\n", __func__,
1448                         lrp->lr_seg.iomode);
1449                 nfserr = nfserr_inval;
1450                 goto out;
1451         }
1452
1453         switch (lrp->lr_return_type) {
1454         case RETURN_FILE:
1455                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1456                 break;
1457         case RETURN_FSID:
1458         case RETURN_ALL:
1459                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1460                 break;
1461         default:
1462                 dprintk("%s: invalid return_type %d\n", __func__,
1463                         lrp->lr_return_type);
1464                 nfserr = nfserr_inval;
1465                 break;
1466         }
1467 out:
1468         return nfserr;
1469 }
1470 #endif /* CONFIG_NFSD_PNFS */
1471
1472 /*
1473  * NULL call.
1474  */
1475 static __be32
1476 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1477 {
1478         return nfs_ok;
1479 }
1480
1481 static inline void nfsd4_increment_op_stats(u32 opnum)
1482 {
1483         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1484                 nfsdstats.nfs4_opcount[opnum]++;
1485 }
1486
1487 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1488                               void *);
1489 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1490 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1491 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1492
1493 enum nfsd4_op_flags {
1494         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1495         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1496         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1497         /* For rfc 5661 section 2.6.3.1.1: */
1498         OP_HANDLES_WRONGSEC = 1 << 3,
1499         OP_IS_PUTFH_LIKE = 1 << 4,
1500         /*
1501          * These are the ops whose result size we estimate before
1502          * encoding, to avoid performing an op then not being able to
1503          * respond or cache a response.  This includes writes and setattrs
1504          * as well as the operations usually called "nonidempotent":
1505          */
1506         OP_MODIFIES_SOMETHING = 1 << 5,
1507         /*
1508          * Cache compounds containing these ops in the xid-based drc:
1509          * We use the DRC for compounds containing non-idempotent
1510          * operations, *except* those that are 4.1-specific (since
1511          * sessions provide their own EOS), and except for stateful
1512          * operations other than setclientid and setclientid_confirm
1513          * (since sequence numbers provide EOS for open, lock, etc in
1514          * the v4.0 case).
1515          */
1516         OP_CACHEME = 1 << 6,
1517         /*
1518          * These are ops which clear current state id.
1519          */
1520         OP_CLEAR_STATEID = 1 << 7,
1521 };
1522
1523 struct nfsd4_operation {
1524         nfsd4op_func op_func;
1525         u32 op_flags;
1526         char *op_name;
1527         /* Try to get response size before operation */
1528         nfsd4op_rsize op_rsize_bop;
1529         stateid_getter op_get_currentstateid;
1530         stateid_setter op_set_currentstateid;
1531 };
1532
1533 static struct nfsd4_operation nfsd4_ops[];
1534
1535 static const char *nfsd4_op_name(unsigned opnum);
1536
1537 /*
1538  * Enforce NFSv4.1 COMPOUND ordering rules:
1539  *
1540  * Also note, enforced elsewhere:
1541  *      - SEQUENCE other than as first op results in
1542  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1543  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1544  *        (Enforced in nfsd4_bind_conn_to_session().)
1545  *      - DESTROY_SESSION must be the final operation in a compound, if
1546  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1547  *        (Enforced in nfsd4_destroy_session().)
1548  */
1549 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1550 {
1551         struct nfsd4_op *op = &args->ops[0];
1552
1553         /* These ordering requirements don't apply to NFSv4.0: */
1554         if (args->minorversion == 0)
1555                 return nfs_ok;
1556         /* This is weird, but OK, not our problem: */
1557         if (args->opcnt == 0)
1558                 return nfs_ok;
1559         if (op->status == nfserr_op_illegal)
1560                 return nfs_ok;
1561         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1562                 return nfserr_op_not_in_session;
1563         if (op->opnum == OP_SEQUENCE)
1564                 return nfs_ok;
1565         if (args->opcnt != 1)
1566                 return nfserr_not_only_op;
1567         return nfs_ok;
1568 }
1569
1570 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1571 {
1572         return &nfsd4_ops[op->opnum];
1573 }
1574
1575 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1576 {
1577         if (op->opnum == OP_ILLEGAL)
1578                 return false;
1579         return OPDESC(op)->op_flags & OP_CACHEME;
1580 }
1581
1582 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1583 {
1584         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1585         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1586         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1587         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1588         struct nfsd4_operation *thisd;
1589         struct nfsd4_operation *nextd;
1590
1591         thisd = OPDESC(this);
1592         /*
1593          * Most ops check wronsec on our own; only the putfh-like ops
1594          * have special rules.
1595          */
1596         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1597                 return false;
1598         /*
1599          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1600          * put-filehandle operation if we're not going to use the
1601          * result:
1602          */
1603         if (argp->opcnt == resp->opcnt)
1604                 return false;
1605         if (next->opnum == OP_ILLEGAL)
1606                 return false;
1607         nextd = OPDESC(next);
1608         /*
1609          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1610          * errors themselves as necessary; others should check for them
1611          * now:
1612          */
1613         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1614 }
1615
1616 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1617                                struct nfsd4_compoundres *resp)
1618 {
1619         struct xdr_stream *xdr = &resp->xdr;
1620         struct xdr_buf *buf = &rqstp->rq_res;
1621         struct kvec *head = buf->head;
1622
1623         xdr->buf = buf;
1624         xdr->iov = head;
1625         xdr->p   = head->iov_base + head->iov_len;
1626         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1627         /* Tail and page_len should be zero at this point: */
1628         buf->len = buf->head[0].iov_len;
1629         xdr->scratch.iov_len = 0;
1630         xdr->page_ptr = buf->pages - 1;
1631         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1632                 - rqstp->rq_auth_slack;
1633 }
1634
1635 /*
1636  * COMPOUND call.
1637  */
1638 static __be32
1639 nfsd4_proc_compound(struct svc_rqst *rqstp,
1640                     struct nfsd4_compoundargs *args,
1641                     struct nfsd4_compoundres *resp)
1642 {
1643         struct nfsd4_op *op;
1644         struct nfsd4_operation *opdesc;
1645         struct nfsd4_compound_state *cstate = &resp->cstate;
1646         struct svc_fh *current_fh = &cstate->current_fh;
1647         struct svc_fh *save_fh = &cstate->save_fh;
1648         __be32          status;
1649
1650         svcxdr_init_encode(rqstp, resp);
1651         resp->tagp = resp->xdr.p;
1652         /* reserve space for: taglen, tag, and opcnt */
1653         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1654         resp->taglen = args->taglen;
1655         resp->tag = args->tag;
1656         resp->rqstp = rqstp;
1657         cstate->minorversion = args->minorversion;
1658         fh_init(current_fh, NFS4_FHSIZE);
1659         fh_init(save_fh, NFS4_FHSIZE);
1660         /*
1661          * Don't use the deferral mechanism for NFSv4; compounds make it
1662          * too hard to avoid non-idempotency problems.
1663          */
1664         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1665
1666         /*
1667          * According to RFC3010, this takes precedence over all other errors.
1668          */
1669         status = nfserr_minor_vers_mismatch;
1670         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1671                 goto out;
1672
1673         status = nfs41_check_op_ordering(args);
1674         if (status) {
1675                 op = &args->ops[0];
1676                 op->status = status;
1677                 goto encode_op;
1678         }
1679
1680         while (!status && resp->opcnt < args->opcnt) {
1681                 op = &args->ops[resp->opcnt++];
1682
1683                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1684                         resp->opcnt, args->opcnt, op->opnum,
1685                         nfsd4_op_name(op->opnum));
1686                 /*
1687                  * The XDR decode routines may have pre-set op->status;
1688                  * for example, if there is a miscellaneous XDR error
1689                  * it will be set to nfserr_bad_xdr.
1690                  */
1691                 if (op->status) {
1692                         if (op->opnum == OP_OPEN)
1693                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1694                         goto encode_op;
1695                 }
1696
1697                 opdesc = OPDESC(op);
1698
1699                 if (!current_fh->fh_dentry) {
1700                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1701                                 op->status = nfserr_nofilehandle;
1702                                 goto encode_op;
1703                         }
1704                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1705                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1706                         op->status = nfserr_moved;
1707                         goto encode_op;
1708                 }
1709
1710                 fh_clear_wcc(current_fh);
1711
1712                 /* If op is non-idempotent */
1713                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1714                         /*
1715                          * Don't execute this op if we couldn't encode a
1716                          * succesful reply:
1717                          */
1718                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1719                         /*
1720                          * Plus if there's another operation, make sure
1721                          * we'll have space to at least encode an error:
1722                          */
1723                         if (resp->opcnt < args->opcnt)
1724                                 plen += COMPOUND_ERR_SLACK_SPACE;
1725                         op->status = nfsd4_check_resp_size(resp, plen);
1726                 }
1727
1728                 if (op->status)
1729                         goto encode_op;
1730
1731                 if (opdesc->op_get_currentstateid)
1732                         opdesc->op_get_currentstateid(cstate, &op->u);
1733                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1734
1735                 if (!op->status) {
1736                         if (opdesc->op_set_currentstateid)
1737                                 opdesc->op_set_currentstateid(cstate, &op->u);
1738
1739                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1740                                 clear_current_stateid(cstate);
1741
1742                         if (need_wrongsec_check(rqstp))
1743                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1744                 }
1745
1746 encode_op:
1747                 /* Only from SEQUENCE */
1748                 if (cstate->status == nfserr_replay_cache) {
1749                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1750                         status = op->status;
1751                         goto out;
1752                 }
1753                 if (op->status == nfserr_replay_me) {
1754                         op->replay = &cstate->replay_owner->so_replay;
1755                         nfsd4_encode_replay(&resp->xdr, op);
1756                         status = op->status = op->replay->rp_status;
1757                 } else {
1758                         nfsd4_encode_operation(resp, op);
1759                         status = op->status;
1760                 }
1761
1762                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1763                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1764                         be32_to_cpu(status));
1765
1766                 nfsd4_cstate_clear_replay(cstate);
1767                 nfsd4_increment_op_stats(op->opnum);
1768         }
1769
1770         cstate->status = status;
1771         fh_put(current_fh);
1772         fh_put(save_fh);
1773         BUG_ON(cstate->replay_owner);
1774 out:
1775         /* Reset deferral mechanism for RPC deferrals */
1776         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1777         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1778         return status;
1779 }
1780
1781 #define op_encode_hdr_size              (2)
1782 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1783 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1784 #define op_encode_change_info_maxsz     (5)
1785 #define nfs4_fattr_bitmap_maxsz         (4)
1786
1787 /* We'll fall back on returning no lockowner if run out of space: */
1788 #define op_encode_lockowner_maxsz       (0)
1789 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1790
1791 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1792
1793 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1794 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1795                                          op_encode_ace_maxsz)
1796
1797 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1798
1799 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1800 {
1801         return (op_encode_hdr_size) * sizeof(__be32);
1802 }
1803
1804 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1805 {
1806         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1807 }
1808
1809 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1810 {
1811         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1812 }
1813
1814 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1815 {
1816         return (op_encode_hdr_size + op_encode_change_info_maxsz
1817                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1818 }
1819
1820 /*
1821  * Note since this is an idempotent operation we won't insist on failing
1822  * the op prematurely if the estimate is too large.  We may turn off splice
1823  * reads unnecessarily.
1824  */
1825 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1826                                       struct nfsd4_op *op)
1827 {
1828         u32 *bmap = op->u.getattr.ga_bmval;
1829         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1830         u32 ret = 0;
1831
1832         if (bmap0 & FATTR4_WORD0_ACL)
1833                 return svc_max_payload(rqstp);
1834         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1835                 return svc_max_payload(rqstp);
1836
1837         if (bmap1 & FATTR4_WORD1_OWNER) {
1838                 ret += IDMAP_NAMESZ + 4;
1839                 bmap1 &= ~FATTR4_WORD1_OWNER;
1840         }
1841         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1842                 ret += IDMAP_NAMESZ + 4;
1843                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1844         }
1845         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1846                 ret += NFS4_FHSIZE + 4;
1847                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1848         }
1849         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1850                 ret += NFS4_MAXLABELLEN + 12;
1851                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1852         }
1853         /*
1854          * Largest of remaining attributes are 16 bytes (e.g.,
1855          * supported_attributes)
1856          */
1857         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1858         /* bitmask, length */
1859         ret += 20;
1860         return ret;
1861 }
1862
1863 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1864 {
1865         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1866                 * sizeof(__be32);
1867 }
1868
1869 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1870 {
1871         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1872                 * sizeof(__be32);
1873 }
1874
1875 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1876 {
1877         return (op_encode_hdr_size + op_encode_stateid_maxsz
1878                 + op_encode_change_info_maxsz + 1
1879                 + nfs4_fattr_bitmap_maxsz
1880                 + op_encode_delegation_maxsz) * sizeof(__be32);
1881 }
1882
1883 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1884 {
1885         u32 maxcount = 0, rlen = 0;
1886
1887         maxcount = svc_max_payload(rqstp);
1888         rlen = min(op->u.read.rd_length, maxcount);
1889
1890         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1891 }
1892
1893 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1894 {
1895         u32 maxcount = 0, rlen = 0;
1896
1897         maxcount = svc_max_payload(rqstp);
1898         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1899
1900         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1901                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1902 }
1903
1904 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1905 {
1906         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1907                 * sizeof(__be32);
1908 }
1909
1910 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1911 {
1912         return (op_encode_hdr_size + op_encode_change_info_maxsz
1913                 + op_encode_change_info_maxsz) * sizeof(__be32);
1914 }
1915
1916 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1917                                        struct nfsd4_op *op)
1918 {
1919         return (op_encode_hdr_size
1920                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1921 }
1922
1923 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1924 {
1925         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1926 }
1927
1928 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1929 {
1930         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1931                                                                 sizeof(__be32);
1932 }
1933
1934 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1935 {
1936         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1937 }
1938
1939 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1940 {
1941         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1942                 1 + 1 + /* eir_flags, spr_how */\
1943                 4 + /* spo_must_enforce & _allow with bitmap */\
1944                 2 + /*eir_server_owner.so_minor_id */\
1945                 /* eir_server_owner.so_major_id<> */\
1946                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1947                 /* eir_server_scope<> */\
1948                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1949                 1 + /* eir_server_impl_id array length */\
1950                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1951 }
1952
1953 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1954 {
1955         return (op_encode_hdr_size + \
1956                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1957                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1958 }
1959
1960 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1961 {
1962         return (op_encode_hdr_size + \
1963                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1964                 2 + /* csr_sequence, csr_flags */\
1965                 op_encode_channel_attrs_maxsz + \
1966                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1967 }
1968
1969 #ifdef CONFIG_NFSD_PNFS
1970 /*
1971  * At this stage we don't really know what layout driver will handle the request,
1972  * so we need to define an arbitrary upper bound here.
1973  */
1974 #define MAX_LAYOUT_SIZE         128
1975 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1976 {
1977         return (op_encode_hdr_size +
1978                 1 /* logr_return_on_close */ +
1979                 op_encode_stateid_maxsz +
1980                 1 /* nr of layouts */ +
1981                 MAX_LAYOUT_SIZE) * sizeof(__be32);
1982 }
1983
1984 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1985 {
1986         return (op_encode_hdr_size +
1987                 1 /* locr_newsize */ +
1988                 2 /* ns_size */) * sizeof(__be32);
1989 }
1990
1991 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1992 {
1993         return (op_encode_hdr_size +
1994                 1 /* lrs_stateid */ +
1995                 op_encode_stateid_maxsz) * sizeof(__be32);
1996 }
1997 #endif /* CONFIG_NFSD_PNFS */
1998
1999 static struct nfsd4_operation nfsd4_ops[] = {
2000         [OP_ACCESS] = {
2001                 .op_func = (nfsd4op_func)nfsd4_access,
2002                 .op_name = "OP_ACCESS",
2003         },
2004         [OP_CLOSE] = {
2005                 .op_func = (nfsd4op_func)nfsd4_close,
2006                 .op_flags = OP_MODIFIES_SOMETHING,
2007                 .op_name = "OP_CLOSE",
2008                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2009                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
2010                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
2011         },
2012         [OP_COMMIT] = {
2013                 .op_func = (nfsd4op_func)nfsd4_commit,
2014                 .op_flags = OP_MODIFIES_SOMETHING,
2015                 .op_name = "OP_COMMIT",
2016                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
2017         },
2018         [OP_CREATE] = {
2019                 .op_func = (nfsd4op_func)nfsd4_create,
2020                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2021                 .op_name = "OP_CREATE",
2022                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
2023         },
2024         [OP_DELEGRETURN] = {
2025                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
2026                 .op_flags = OP_MODIFIES_SOMETHING,
2027                 .op_name = "OP_DELEGRETURN",
2028                 .op_rsize_bop = nfsd4_only_status_rsize,
2029                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
2030         },
2031         [OP_GETATTR] = {
2032                 .op_func = (nfsd4op_func)nfsd4_getattr,
2033                 .op_flags = ALLOWED_ON_ABSENT_FS,
2034                 .op_rsize_bop = nfsd4_getattr_rsize,
2035                 .op_name = "OP_GETATTR",
2036         },
2037         [OP_GETFH] = {
2038                 .op_func = (nfsd4op_func)nfsd4_getfh,
2039                 .op_name = "OP_GETFH",
2040         },
2041         [OP_LINK] = {
2042                 .op_func = (nfsd4op_func)nfsd4_link,
2043                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2044                                 | OP_CACHEME,
2045                 .op_name = "OP_LINK",
2046                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
2047         },
2048         [OP_LOCK] = {
2049                 .op_func = (nfsd4op_func)nfsd4_lock,
2050                 .op_flags = OP_MODIFIES_SOMETHING,
2051                 .op_name = "OP_LOCK",
2052                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2053                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
2054         },
2055         [OP_LOCKT] = {
2056                 .op_func = (nfsd4op_func)nfsd4_lockt,
2057                 .op_name = "OP_LOCKT",
2058         },
2059         [OP_LOCKU] = {
2060                 .op_func = (nfsd4op_func)nfsd4_locku,
2061                 .op_flags = OP_MODIFIES_SOMETHING,
2062                 .op_name = "OP_LOCKU",
2063                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2064                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
2065         },
2066         [OP_LOOKUP] = {
2067                 .op_func = (nfsd4op_func)nfsd4_lookup,
2068                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2069                 .op_name = "OP_LOOKUP",
2070         },
2071         [OP_LOOKUPP] = {
2072                 .op_func = (nfsd4op_func)nfsd4_lookupp,
2073                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2074                 .op_name = "OP_LOOKUPP",
2075         },
2076         [OP_NVERIFY] = {
2077                 .op_func = (nfsd4op_func)nfsd4_nverify,
2078                 .op_name = "OP_NVERIFY",
2079         },
2080         [OP_OPEN] = {
2081                 .op_func = (nfsd4op_func)nfsd4_open,
2082                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2083                 .op_name = "OP_OPEN",
2084                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
2085                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
2086         },
2087         [OP_OPEN_CONFIRM] = {
2088                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
2089                 .op_flags = OP_MODIFIES_SOMETHING,
2090                 .op_name = "OP_OPEN_CONFIRM",
2091                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2092         },
2093         [OP_OPEN_DOWNGRADE] = {
2094                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
2095                 .op_flags = OP_MODIFIES_SOMETHING,
2096                 .op_name = "OP_OPEN_DOWNGRADE",
2097                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2098                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
2099                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
2100         },
2101         [OP_PUTFH] = {
2102                 .op_func = (nfsd4op_func)nfsd4_putfh,
2103                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2104                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2105                 .op_name = "OP_PUTFH",
2106                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2107         },
2108         [OP_PUTPUBFH] = {
2109                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2110                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2111                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2112                 .op_name = "OP_PUTPUBFH",
2113                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2114         },
2115         [OP_PUTROOTFH] = {
2116                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2117                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2118                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2119                 .op_name = "OP_PUTROOTFH",
2120                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2121         },
2122         [OP_READ] = {
2123                 .op_func = (nfsd4op_func)nfsd4_read,
2124                 .op_name = "OP_READ",
2125                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
2126                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
2127         },
2128         [OP_READDIR] = {
2129                 .op_func = (nfsd4op_func)nfsd4_readdir,
2130                 .op_name = "OP_READDIR",
2131                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
2132         },
2133         [OP_READLINK] = {
2134                 .op_func = (nfsd4op_func)nfsd4_readlink,
2135                 .op_name = "OP_READLINK",
2136         },
2137         [OP_REMOVE] = {
2138                 .op_func = (nfsd4op_func)nfsd4_remove,
2139                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2140                 .op_name = "OP_REMOVE",
2141                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
2142         },
2143         [OP_RENAME] = {
2144                 .op_func = (nfsd4op_func)nfsd4_rename,
2145                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2146                 .op_name = "OP_RENAME",
2147                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
2148         },
2149         [OP_RENEW] = {
2150                 .op_func = (nfsd4op_func)nfsd4_renew,
2151                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2152                                 | OP_MODIFIES_SOMETHING,
2153                 .op_name = "OP_RENEW",
2154                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2155
2156         },
2157         [OP_RESTOREFH] = {
2158                 .op_func = (nfsd4op_func)nfsd4_restorefh,
2159                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2160                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2161                 .op_name = "OP_RESTOREFH",
2162                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2163         },
2164         [OP_SAVEFH] = {
2165                 .op_func = (nfsd4op_func)nfsd4_savefh,
2166                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2167                 .op_name = "OP_SAVEFH",
2168                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2169         },
2170         [OP_SECINFO] = {
2171                 .op_func = (nfsd4op_func)nfsd4_secinfo,
2172                 .op_flags = OP_HANDLES_WRONGSEC,
2173                 .op_name = "OP_SECINFO",
2174         },
2175         [OP_SETATTR] = {
2176                 .op_func = (nfsd4op_func)nfsd4_setattr,
2177                 .op_name = "OP_SETATTR",
2178                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2179                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
2180                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
2181         },
2182         [OP_SETCLIENTID] = {
2183                 .op_func = (nfsd4op_func)nfsd4_setclientid,
2184                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2185                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2186                 .op_name = "OP_SETCLIENTID",
2187                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
2188         },
2189         [OP_SETCLIENTID_CONFIRM] = {
2190                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
2191                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2192                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2193                 .op_name = "OP_SETCLIENTID_CONFIRM",
2194                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2195         },
2196         [OP_VERIFY] = {
2197                 .op_func = (nfsd4op_func)nfsd4_verify,
2198                 .op_name = "OP_VERIFY",
2199         },
2200         [OP_WRITE] = {
2201                 .op_func = (nfsd4op_func)nfsd4_write,
2202                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2203                 .op_name = "OP_WRITE",
2204                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
2205                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
2206         },
2207         [OP_RELEASE_LOCKOWNER] = {
2208                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
2209                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2210                                 | OP_MODIFIES_SOMETHING,
2211                 .op_name = "OP_RELEASE_LOCKOWNER",
2212                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2213         },
2214
2215         /* NFSv4.1 operations */
2216         [OP_EXCHANGE_ID] = {
2217                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
2218                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2219                                 | OP_MODIFIES_SOMETHING,
2220                 .op_name = "OP_EXCHANGE_ID",
2221                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
2222         },
2223         [OP_BACKCHANNEL_CTL] = {
2224                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
2225                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2226                 .op_name = "OP_BACKCHANNEL_CTL",
2227                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2228         },
2229         [OP_BIND_CONN_TO_SESSION] = {
2230                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
2231                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2232                                 | OP_MODIFIES_SOMETHING,
2233                 .op_name = "OP_BIND_CONN_TO_SESSION",
2234                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
2235         },
2236         [OP_CREATE_SESSION] = {
2237                 .op_func = (nfsd4op_func)nfsd4_create_session,
2238                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2239                                 | OP_MODIFIES_SOMETHING,
2240                 .op_name = "OP_CREATE_SESSION",
2241                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
2242         },
2243         [OP_DESTROY_SESSION] = {
2244                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
2245                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2246                                 | OP_MODIFIES_SOMETHING,
2247                 .op_name = "OP_DESTROY_SESSION",
2248                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2249         },
2250         [OP_SEQUENCE] = {
2251                 .op_func = (nfsd4op_func)nfsd4_sequence,
2252                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2253                 .op_name = "OP_SEQUENCE",
2254                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
2255         },
2256         [OP_DESTROY_CLIENTID] = {
2257                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
2258                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2259                                 | OP_MODIFIES_SOMETHING,
2260                 .op_name = "OP_DESTROY_CLIENTID",
2261                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2262         },
2263         [OP_RECLAIM_COMPLETE] = {
2264                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
2265                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2266                 .op_name = "OP_RECLAIM_COMPLETE",
2267                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2268         },
2269         [OP_SECINFO_NO_NAME] = {
2270                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
2271                 .op_flags = OP_HANDLES_WRONGSEC,
2272                 .op_name = "OP_SECINFO_NO_NAME",
2273         },
2274         [OP_TEST_STATEID] = {
2275                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
2276                 .op_flags = ALLOWED_WITHOUT_FH,
2277                 .op_name = "OP_TEST_STATEID",
2278         },
2279         [OP_FREE_STATEID] = {
2280                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
2281                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2282                 .op_name = "OP_FREE_STATEID",
2283                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
2284                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2285         },
2286 #ifdef CONFIG_NFSD_PNFS
2287         [OP_GETDEVICEINFO] = {
2288                 .op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
2289                 .op_flags = ALLOWED_WITHOUT_FH,
2290                 .op_name = "OP_GETDEVICEINFO",
2291         },
2292         [OP_LAYOUTGET] = {
2293                 .op_func = (nfsd4op_func)nfsd4_layoutget,
2294                 .op_flags = OP_MODIFIES_SOMETHING,
2295                 .op_name = "OP_LAYOUTGET",
2296                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutget_rsize,
2297         },
2298         [OP_LAYOUTCOMMIT] = {
2299                 .op_func = (nfsd4op_func)nfsd4_layoutcommit,
2300                 .op_flags = OP_MODIFIES_SOMETHING,
2301                 .op_name = "OP_LAYOUTCOMMIT",
2302                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutcommit_rsize,
2303         },
2304         [OP_LAYOUTRETURN] = {
2305                 .op_func = (nfsd4op_func)nfsd4_layoutreturn,
2306                 .op_flags = OP_MODIFIES_SOMETHING,
2307                 .op_name = "OP_LAYOUTRETURN",
2308                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutreturn_rsize,
2309         },
2310 #endif /* CONFIG_NFSD_PNFS */
2311
2312         /* NFSv4.2 operations */
2313         [OP_ALLOCATE] = {
2314                 .op_func = (nfsd4op_func)nfsd4_allocate,
2315                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2316                 .op_name = "OP_ALLOCATE",
2317                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2318         },
2319         [OP_DEALLOCATE] = {
2320                 .op_func = (nfsd4op_func)nfsd4_deallocate,
2321                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2322                 .op_name = "OP_DEALLOCATE",
2323                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2324         },
2325         [OP_CLONE] = {
2326                 .op_func = (nfsd4op_func)nfsd4_clone,
2327                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2328                 .op_name = "OP_CLONE",
2329                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2330         },
2331         [OP_SEEK] = {
2332                 .op_func = (nfsd4op_func)nfsd4_seek,
2333                 .op_name = "OP_SEEK",
2334         },
2335 };
2336
2337 /**
2338  * nfsd4_spo_must_allow - Determine if the compound op contains an
2339  * operation that is allowed to be sent with machine credentials
2340  *
2341  * @rqstp: a pointer to the struct svc_rqst
2342  *
2343  * Checks to see if the compound contains a spo_must_allow op
2344  * and confirms that it was sent with the proper machine creds.
2345  */
2346
2347 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2348 {
2349         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2350         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2351         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2352         struct nfsd4_compound_state *cstate = &resp->cstate;
2353         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2354         u32 opiter;
2355
2356         if (!cstate->minorversion)
2357                 return false;
2358
2359         if (cstate->spo_must_allowed == true)
2360                 return true;
2361
2362         opiter = resp->opcnt;
2363         while (opiter < argp->opcnt) {
2364                 this = &argp->ops[opiter++];
2365                 if (test_bit(this->opnum, allow->u.longs) &&
2366                         cstate->clp->cl_mach_cred &&
2367                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2368                         cstate->spo_must_allowed = true;
2369                         return true;
2370                 }
2371         }
2372         cstate->spo_must_allowed = false;
2373         return false;
2374 }
2375
2376 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2377 {
2378         struct nfsd4_operation *opdesc;
2379         nfsd4op_rsize estimator;
2380
2381         if (op->opnum == OP_ILLEGAL)
2382                 return op_encode_hdr_size * sizeof(__be32);
2383         opdesc = OPDESC(op);
2384         estimator = opdesc->op_rsize_bop;
2385         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
2386 }
2387
2388 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2389 {
2390         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2391                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2392                         op->opnum, nfsd4_op_name(op->opnum));
2393                 WARN_ON_ONCE(1);
2394         }
2395 }
2396
2397 static const char *nfsd4_op_name(unsigned opnum)
2398 {
2399         if (opnum < ARRAY_SIZE(nfsd4_ops))
2400                 return nfsd4_ops[opnum].op_name;
2401         return "unknown_operation";
2402 }
2403
2404 #define nfsd4_voidres                   nfsd4_voidargs
2405 struct nfsd4_voidargs { int dummy; };
2406
2407 static struct svc_procedure             nfsd_procedures4[2] = {
2408         [NFSPROC4_NULL] = {
2409                 .pc_func = (svc_procfunc) nfsd4_proc_null,
2410                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2411                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2412                 .pc_ressize = sizeof(struct nfsd4_voidres),
2413                 .pc_cachetype = RC_NOCACHE,
2414                 .pc_xdrressize = 1,
2415         },
2416         [NFSPROC4_COMPOUND] = {
2417                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
2418                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2419                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2420                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2421                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2422                 .pc_release = nfsd4_release_compoundargs,
2423                 .pc_cachetype = RC_NOCACHE,
2424                 .pc_xdrressize = NFSD_BUFSIZE/4,
2425         },
2426 };
2427
2428 struct svc_version      nfsd_version4 = {
2429                 .vs_vers        = 4,
2430                 .vs_nproc       = 2,
2431                 .vs_proc        = nfsd_procedures4,
2432                 .vs_dispatch    = nfsd_dispatch,
2433                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
2434                 .vs_rpcb_optnl  = 1,
2435 };
2436
2437 /*
2438  * Local variables:
2439  *  c-basic-offset: 8
2440  * End:
2441  */