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 <[email protected]>
   8  *  Andy Adamson   <[email protected]>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/fs_struct.h>
  36 #include <linux/file.h>
  37 #include <linux/falloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/kthread.h>
  40 #include <linux/sunrpc/addr.h>
  41
  42 #include "idmap.h"
  43 #include "cache.h"
  44 #include "xdr4.h"
  45 #include "vfs.h"
  46 #include "current_stateid.h"
  47 #include "netns.h"
  48 #include "acl.h"
  49 #include "pnfs.h"
  50 #include "trace.h"
  51
  52 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  53 #include <linux/security.h>
  54
  55 static inline void
  56 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  57 {
  58         struct inode *inode = d_inode(resfh->fh_dentry);
  59         int status;
  60
  61         inode_lock(inode);
  62         status = security_inode_setsecctx(resfh->fh_dentry,
  63                 label->data, label->len);
  64         inode_unlock(inode);
  65
  66         if (status)
  67                 /*
  68                  * XXX: We should really fail the whole open, but we may
  69                  * already have created a new file, so it may be too
  70                  * late.  For now this seems the least of evils:
  71                  */
  72                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  73
  74         return;
  75 }
  76 #else
  77 static inline void
  78 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  79 { }
  80 #endif
  81
  82 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  83
  84 static u32 nfsd_attrmask[] = {
  85         NFSD_WRITEABLE_ATTRS_WORD0,
  86         NFSD_WRITEABLE_ATTRS_WORD1,
  87         NFSD_WRITEABLE_ATTRS_WORD2
  88 };
  89
  90 static u32 nfsd41_ex_attrmask[] = {
  91         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  92         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  93         NFSD_SUPPATTR_EXCLCREAT_WORD2
  94 };
  95
  96 static __be32
  97 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  98                    u32 *bmval, u32 *writable)
  99 {
 100         struct dentry *dentry = cstate->current_fh.fh_dentry;
 101         struct svc_export *exp = cstate->current_fh.fh_export;
 102
 103         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
 104                 return nfserr_attrnotsupp;
 105         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
 106                 return nfserr_attrnotsupp;
 107         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
 108                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
 109                 return nfserr_attrnotsupp;
 110         if (writable && !bmval_is_subset(bmval, writable))
 111                 return nfserr_inval;
 112         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
 113                         (bmval[1] & FATTR4_WORD1_MODE))
 114                 return nfserr_inval;
 115         return nfs_ok;
 116 }
 117
 118 static __be32
 119 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 120         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 121 {
 122         __be32 status = nfs_ok;
 123
 124         if (open->op_create == NFS4_OPEN_CREATE) {
 125                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 126                     || open->op_createmode == NFS4_CREATE_GUARDED)
 127                         status = check_attr_support(rqstp, cstate,
 128                                         open->op_bmval, nfsd_attrmask);
 129                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 130                         status = check_attr_support(rqstp, cstate,
 131                                         open->op_bmval, nfsd41_ex_attrmask);
 132         }
 133
 134         return status;
 135 }
 136
 137 static int
 138 is_create_with_attrs(struct nfsd4_open *open)
 139 {
 140         return open->op_create == NFS4_OPEN_CREATE
 141                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 142                     || open->op_createmode == NFS4_CREATE_GUARDED
 143                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 144 }
 145
 146 /*
 147  * if error occurs when setting the acl, just clear the acl bit
 148  * in the returned attr bitmap.
 149  */
 150 static void
 151 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 152                 struct nfs4_acl *acl, u32 *bmval)
 153 {
 154         __be32 status;
 155
 156         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 157         if (status)
 158                 /*
 159                  * We should probably fail the whole open at this point,
 160                  * but we've already created the file, so it's too late;
 161                  * So this seems the least of evils:
 162                  */
 163                 bmval[0] &= ~FATTR4_WORD0_ACL;
 164 }
 165
 166 static inline void
 167 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 168 {
 169         fh_put(dst);
 170         dget(src->fh_dentry);
 171         if (src->fh_export)
 172                 exp_get(src->fh_export);
 173         *dst = *src;
 174 }
 175
 176 static __be32
 177 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 178 {
 179         __be32 status;
 180
 181         if (open->op_truncate &&
 182                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 183                 return nfserr_inval;
 184
 185         accmode |= NFSD_MAY_READ_IF_EXEC;
 186
 187         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 188                 accmode |= NFSD_MAY_READ;
 189         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 190                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 191         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 192                 accmode |= NFSD_MAY_WRITE;
 193
 194         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 195
 196         return status;
 197 }
 198
 199 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 200 {
 201         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 202
 203         if (S_ISREG(mode))
 204                 return nfs_ok;
 205         if (S_ISDIR(mode))
 206                 return nfserr_isdir;
 207         /*
 208          * Using err_symlink as our catch-all case may look odd; but
 209          * there's no other obvious error for this case in 4.0, and we
 210          * happen to know that it will cause the linux v4 client to do
 211          * the right thing on attempts to open something other than a
 212          * regular file.
 213          */
 214         return nfserr_symlink;
 215 }
 216
 217 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 218 {
 219         if (nfsd4_has_session(cstate))
 220                 return;
 221         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 222                         &resfh->fh_handle);
 223 }
 224
 225 static __be32
 226 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 227 {
 228         struct svc_fh *current_fh = &cstate->current_fh;
 229         int accmode;
 230         __be32 status;
 231
 232         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 233         if (!*resfh)
 234                 return nfserr_jukebox;
 235         fh_init(*resfh, NFS4_FHSIZE);
 236         open->op_truncate = false;
 237
 238         if (open->op_create) {
 239                 /* FIXME: check session persistence and pnfs flags.
 240                  * The nfsv4.1 spec requires the following semantics:
 241                  *
 242                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 243                  * Reply Cache  | server |                 |
 244                  * -------------+--------+-----------------+--------------------
 245                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 246                  *              |        |                 | (SHOULD)
 247                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 248                  *              |        |                 | (SHOULD NOT)
 249                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 250                  * yes          | no     | GUARDED4        | GUARDED4
 251                  * yes          | yes    | GUARDED4        | GUARDED4
 252                  */
 253
 254                 /*
 255                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 256                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 257                  */
 258                 current->fs->umask = open->op_umask;
 259                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 260                                         open->op_fname.len, &open->op_iattr,
 261                                         *resfh, open->op_createmode,
 262                                         (u32 *)open->op_verf.data,
 263                                         &open->op_truncate, &open->op_created);
 264                 current->fs->umask = 0;
 265
 266                 if (!status && open->op_label.len)
 267                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 268
 269                 /*
 270                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 271                  * use the returned bitmask to indicate which attributes
 272                  * we used to store the verifier:
 273                  */
 274                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 275                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 276                                                 FATTR4_WORD1_TIME_MODIFY);
 277         } else
 278                 /*
 279                  * Note this may exit with the parent still locked.
 280                  * We will hold the lock until nfsd4_open's final
 281                  * lookup, to prevent renames or unlinks until we've had
 282                  * a chance to an acquire a delegation if appropriate.
 283                  */
 284                 status = nfsd_lookup(rqstp, current_fh,
 285                                      open->op_fname.data, open->op_fname.len, *resfh);
 286         if (status)
 287                 goto out;
 288         status = nfsd_check_obj_isreg(*resfh);
 289         if (status)
 290                 goto out;
 291
 292         if (is_create_with_attrs(open) && open->op_acl != NULL)
 293                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 294
 295         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 296         accmode = NFSD_MAY_NOP;
 297         if (open->op_created ||
 298                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 299                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 300         status = do_open_permission(rqstp, *resfh, open, accmode);
 301         set_change_info(&open->op_cinfo, current_fh);
 302 out:
 303         return status;
 304 }
 305
 306 static __be32
 307 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 308 {
 309         struct svc_fh *current_fh = &cstate->current_fh;
 310         __be32 status;
 311         int accmode = 0;
 312
 313         /* We don't know the target directory, and therefore can not
 314         * set the change info
 315         */
 316
 317         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 318
 319         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 320
 321         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 322                 (open->op_iattr.ia_size == 0);
 323         /*
 324          * In the delegation case, the client is telling us about an
 325          * open that it *already* performed locally, some time ago.  We
 326          * should let it succeed now if possible.
 327          *
 328          * In the case of a CLAIM_FH open, on the other hand, the client
 329          * may be counting on us to enforce permissions (the Linux 4.1
 330          * client uses this for normal opens, for example).
 331          */
 332         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 333                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 334
 335         status = do_open_permission(rqstp, current_fh, open, accmode);
 336
 337         return status;
 338 }
 339
 340 static void
 341 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 342 {
 343         struct nfsd4_sessionid *sid =
 344                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 345
 346         clid->cl_boot = sid->clientid.cl_boot;
 347         clid->cl_id = sid->clientid.cl_id;
 348 }
 349
 350 static __be32
 351 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 352            union nfsd4_op_u *u)
 353 {
 354         struct nfsd4_open *open = &u->open;
 355         __be32 status;
 356         struct svc_fh *resfh = NULL;
 357         struct net *net = SVC_NET(rqstp);
 358         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 359         bool reclaim = false;
 360
 361         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 362                 (int)open->op_fname.len, open->op_fname.data,
 363                 open->op_openowner);
 364
 365         /* This check required by spec. */
 366         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 367                 return nfserr_inval;
 368
 369         open->op_created = false;
 370         /*
 371          * RFC5661 18.51.3
 372          * Before RECLAIM_COMPLETE done, server should deny new lock
 373          */
 374         if (nfsd4_has_session(cstate) &&
 375             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 376                       &cstate->session->se_client->cl_flags) &&
 377             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 378                 return nfserr_grace;
 379
 380         if (nfsd4_has_session(cstate))
 381                 copy_clientid(&open->op_clientid, cstate->session);
 382
 383         /* check seqid for replay. set nfs4_owner */
 384         status = nfsd4_process_open1(cstate, open, nn);
 385         if (status == nfserr_replay_me) {
 386                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 387                 fh_put(&cstate->current_fh);
 388                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 389                                 &rp->rp_openfh);
 390                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 391                 if (status)
 392                         dprintk("nfsd4_open: replay failed"
 393                                 " restoring previous filehandle\n");
 394                 else
 395                         status = nfserr_replay_me;
 396         }
 397         if (status)
 398                 goto out;
 399         if (open->op_xdr_error) {
 400                 status = open->op_xdr_error;
 401                 goto out;
 402         }
 403
 404         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 405         if (status)
 406                 goto out;
 407
 408         /* Openowner is now set, so sequence id will get bumped.  Now we need
 409          * these checks before we do any creates: */
 410         status = nfserr_grace;
 411         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 412                 goto out;
 413         status = nfserr_no_grace;
 414         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 415                 goto out;
 416
 417         switch (open->op_claim_type) {
 418                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 419                 case NFS4_OPEN_CLAIM_NULL:
 420                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 421                         if (status)
 422                                 goto out;
 423                         break;
 424                 case NFS4_OPEN_CLAIM_PREVIOUS:
 425                         status = nfs4_check_open_reclaim(&open->op_clientid,
 426                                                          cstate, nn);
 427                         if (status)
 428                                 goto out;
 429                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 430                         reclaim = true;
 431                         /* fall through */
 432                 case NFS4_OPEN_CLAIM_FH:
 433                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 434                         status = do_open_fhandle(rqstp, cstate, open);
 435                         if (status)
 436                                 goto out;
 437                         resfh = &cstate->current_fh;
 438                         break;
 439                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 440                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 441                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 442                                 open->op_claim_type);
 443                         status = nfserr_notsupp;
 444                         goto out;
 445                 default:
 446                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 447                                 open->op_claim_type);
 448                         status = nfserr_inval;
 449                         goto out;
 450         }
 451         /*
 452          * nfsd4_process_open2() does the actual opening of the file.  If
 453          * successful, it (1) truncates the file if open->op_truncate was
 454          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 455          */
 456         status = nfsd4_process_open2(rqstp, resfh, open);
 457         WARN(status && open->op_created,
 458              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 459              be32_to_cpu(status));
 460         if (reclaim && !status)
 461                 nn->somebody_reclaimed = true;
 462 out:
 463         if (resfh && resfh != &cstate->current_fh) {
 464                 fh_dup2(&cstate->current_fh, resfh);
 465                 fh_put(resfh);
 466                 kfree(resfh);
 467         }
 468         nfsd4_cleanup_open_state(cstate, open);
 469         nfsd4_bump_seqid(cstate, status);
 470         return status;
 471 }
 472
 473 /*
 474  * OPEN is the only seqid-mutating operation whose decoding can fail
 475  * with a seqid-mutating error (specifically, decoding of user names in
 476  * the attributes).  Therefore we have to do some processing to look up
 477  * the stateowner so that we can bump the seqid.
 478  */
 479 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 480 {
 481         struct nfsd4_open *open = &op->u.open;
 482
 483         if (!seqid_mutating_err(ntohl(op->status)))
 484                 return op->status;
 485         if (nfsd4_has_session(cstate))
 486                 return op->status;
 487         open->op_xdr_error = op->status;
 488         return nfsd4_open(rqstp, cstate, &op->u);
 489 }
 490
 491 /*
 492  * filehandle-manipulating ops.
 493  */
 494 static __be32
 495 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 496             union nfsd4_op_u *u)
 497 {
 498         u->getfh = &cstate->current_fh;
 499         return nfs_ok;
 500 }
 501
 502 static __be32
 503 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 504             union nfsd4_op_u *u)
 505 {
 506         struct nfsd4_putfh *putfh = &u->putfh;
 507         __be32 ret;
 508
 509         fh_put(&cstate->current_fh);
 510         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 511         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 512                putfh->pf_fhlen);
 513         ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 514 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
 515         if (ret == nfserr_stale && putfh->no_verify) {
 516                 SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
 517                 ret = 0;
 518         }
 519 #endif
 520         return ret;
 521 }
 522
 523 static __be32
 524 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 525                 union nfsd4_op_u *u)
 526 {
 527         __be32 status;
 528
 529         fh_put(&cstate->current_fh);
 530         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 531         return status;
 532 }
 533
 534 static __be32
 535 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 536                 union nfsd4_op_u *u)
 537 {
 538         if (!cstate->save_fh.fh_dentry)
 539                 return nfserr_restorefh;
 540
 541         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 542         if (HAS_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG)) {
 543                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 544                 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
 545         }
 546         return nfs_ok;
 547 }
 548
 549 static __be32
 550 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 551              union nfsd4_op_u *u)
 552 {
 553         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 554         if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG)) {
 555                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 556                 SET_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG);
 557         }
 558         return nfs_ok;
 559 }
 560
 561 /*
 562  * misc nfsv4 ops
 563  */
 564 static __be32
 565 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 566              union nfsd4_op_u *u)
 567 {
 568         struct nfsd4_access *access = &u->access;
 569
 570         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 571                 return nfserr_inval;
 572
 573         access->ac_resp_access = access->ac_req_access;
 574         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 575                            &access->ac_supported);
 576 }
 577
 578 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 579 {
 580         __be32 *verf = (__be32 *)verifier->data;
 581
 582         BUILD_BUG_ON(2*sizeof(*verf) != sizeof(verifier->data));
 583
 584         nfsd_copy_boot_verifier(verf, net_generic(net, nfsd_net_id));
 585 }
 586
 587 static __be32
 588 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 589              union nfsd4_op_u *u)
 590 {
 591         struct nfsd4_commit *commit = &u->commit;
 592
 593         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 594                              commit->co_count,
 595                              (__be32 *)commit->co_verf.data);
 596 }
 597
 598 static __be32
 599 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600              union nfsd4_op_u *u)
 601 {
 602         struct nfsd4_create *create = &u->create;
 603         struct svc_fh resfh;
 604         __be32 status;
 605         dev_t rdev;
 606
 607         fh_init(&resfh, NFS4_FHSIZE);
 608
 609         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 610         if (status)
 611                 return status;
 612
 613         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 614                                     nfsd_attrmask);
 615         if (status)
 616                 return status;
 617
 618         current->fs->umask = create->cr_umask;
 619         switch (create->cr_type) {
 620         case NF4LNK:
 621                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 622                                       create->cr_name, create->cr_namelen,
 623                                       create->cr_data, &resfh);
 624                 break;
 625
 626         case NF4BLK:
 627                 status = nfserr_inval;
 628                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 629                 if (MAJOR(rdev) != create->cr_specdata1 ||
 630                     MINOR(rdev) != create->cr_specdata2)
 631                         goto out_umask;
 632                 status = nfsd_create(rqstp, &cstate->current_fh,
 633                                      create->cr_name, create->cr_namelen,
 634                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 635                 break;
 636
 637         case NF4CHR:
 638                 status = nfserr_inval;
 639                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 640                 if (MAJOR(rdev) != create->cr_specdata1 ||
 641                     MINOR(rdev) != create->cr_specdata2)
 642                         goto out_umask;
 643                 status = nfsd_create(rqstp, &cstate->current_fh,
 644                                      create->cr_name, create->cr_namelen,
 645                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 646                 break;
 647
 648         case NF4SOCK:
 649                 status = nfsd_create(rqstp, &cstate->current_fh,
 650                                      create->cr_name, create->cr_namelen,
 651                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 652                 break;
 653
 654         case NF4FIFO:
 655                 status = nfsd_create(rqstp, &cstate->current_fh,
 656                                      create->cr_name, create->cr_namelen,
 657                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 658                 break;
 659
 660         case NF4DIR:
 661                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 662                 status = nfsd_create(rqstp, &cstate->current_fh,
 663                                      create->cr_name, create->cr_namelen,
 664                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 665                 break;
 666
 667         default:
 668                 status = nfserr_badtype;
 669         }
 670
 671         if (status)
 672                 goto out;
 673
 674         if (create->cr_label.len)
 675                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 676
 677         if (create->cr_acl != NULL)
 678                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 679                                 create->cr_bmval);
 680
 681         fh_unlock(&cstate->current_fh);
 682         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 683         fh_dup2(&cstate->current_fh, &resfh);
 684 out:
 685         fh_put(&resfh);
 686 out_umask:
 687         current->fs->umask = 0;
 688         return status;
 689 }
 690
 691 static __be32
 692 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 693               union nfsd4_op_u *u)
 694 {
 695         struct nfsd4_getattr *getattr = &u->getattr;
 696         __be32 status;
 697
 698         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 699         if (status)
 700                 return status;
 701
 702         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 703                 return nfserr_inval;
 704
 705         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 706         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 707         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 708
 709         getattr->ga_fhp = &cstate->current_fh;
 710         return nfs_ok;
 711 }
 712
 713 static __be32
 714 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 715            union nfsd4_op_u *u)
 716 {
 717         struct nfsd4_link *link = &u->link;
 718         __be32 status;
 719
 720         status = nfsd_link(rqstp, &cstate->current_fh,
 721                            link->li_name, link->li_namelen, &cstate->save_fh);
 722         if (!status)
 723                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 724         return status;
 725 }
 726
 727 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 728 {
 729         struct svc_fh tmp_fh;
 730         __be32 ret;
 731
 732         fh_init(&tmp_fh, NFS4_FHSIZE);
 733         ret = exp_pseudoroot(rqstp, &tmp_fh);
 734         if (ret)
 735                 return ret;
 736         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 737                 fh_put(&tmp_fh);
 738                 return nfserr_noent;
 739         }
 740         fh_put(&tmp_fh);
 741         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 742 }
 743
 744 static __be32
 745 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 746               union nfsd4_op_u *u)
 747 {
 748         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 749 }
 750
 751 static __be32
 752 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 753              union nfsd4_op_u *u)
 754 {
 755         return nfsd_lookup(rqstp, &cstate->current_fh,
 756                            u->lookup.lo_name, u->lookup.lo_len,
 757                            &cstate->current_fh);
 758 }
 759
 760 static __be32
 761 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 762            union nfsd4_op_u *u)
 763 {
 764         struct nfsd4_read *read = &u->read;
 765         __be32 status;
 766
 767         read->rd_nf = NULL;
 768         if (read->rd_offset >= OFFSET_MAX)
 769                 return nfserr_inval;
 770
 771         trace_nfsd_read_start(rqstp, &cstate->current_fh,
 772                               read->rd_offset, read->rd_length);
 773
 774         /*
 775          * If we do a zero copy read, then a client will see read data
 776          * that reflects the state of the file *after* performing the
 777          * following compound.
 778          *
 779          * To ensure proper ordering, we therefore turn off zero copy if
 780          * the client wants us to do more in this compound:
 781          */
 782         if (!nfsd4_last_compound_op(rqstp))
 783                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 784
 785         /* check stateid */
 786         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 787                                         &read->rd_stateid, RD_STATE,
 788                                         &read->rd_nf, NULL);
 789         if (status) {
 790                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 791                 goto out;
 792         }
 793         status = nfs_ok;
 794 out:
 795         read->rd_rqstp = rqstp;
 796         read->rd_fhp = &cstate->current_fh;
 797         return status;
 798 }
 799
 800
 801 static void
 802 nfsd4_read_release(union nfsd4_op_u *u)
 803 {
 804         if (u->read.rd_nf)
 805                 nfsd_file_put(u->read.rd_nf);
 806         trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
 807                              u->read.rd_offset, u->read.rd_length);
 808 }
 809
 810 static __be32
 811 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 812               union nfsd4_op_u *u)
 813 {
 814         struct nfsd4_readdir *readdir = &u->readdir;
 815         u64 cookie = readdir->rd_cookie;
 816         static const nfs4_verifier zeroverf;
 817
 818         /* no need to check permission - this will be done in nfsd_readdir() */
 819
 820         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 821                 return nfserr_inval;
 822
 823         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 824         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 825         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 826
 827         if ((cookie == 1) || (cookie == 2) ||
 828             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 829                 return nfserr_bad_cookie;
 830
 831         readdir->rd_rqstp = rqstp;
 832         readdir->rd_fhp = &cstate->current_fh;
 833         return nfs_ok;
 834 }
 835
 836 static __be32
 837 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 838                union nfsd4_op_u *u)
 839 {
 840         u->readlink.rl_rqstp = rqstp;
 841         u->readlink.rl_fhp = &cstate->current_fh;
 842         return nfs_ok;
 843 }
 844
 845 static __be32
 846 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 847              union nfsd4_op_u *u)
 848 {
 849         struct nfsd4_remove *remove = &u->remove;
 850         __be32 status;
 851
 852         if (opens_in_grace(SVC_NET(rqstp)))
 853                 return nfserr_grace;
 854         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 855                              remove->rm_name, remove->rm_namelen);
 856         if (!status) {
 857                 fh_unlock(&cstate->current_fh);
 858                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 859         }
 860         return status;
 861 }
 862
 863 static __be32
 864 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 865              union nfsd4_op_u *u)
 866 {
 867         struct nfsd4_rename *rename = &u->rename;
 868         __be32 status;
 869
 870         if (opens_in_grace(SVC_NET(rqstp)))
 871                 return nfserr_grace;
 872         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 873                              rename->rn_snamelen, &cstate->current_fh,
 874                              rename->rn_tname, rename->rn_tnamelen);
 875         if (status)
 876                 return status;
 877         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 878         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 879         return nfs_ok;
 880 }
 881
 882 static __be32
 883 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 884               union nfsd4_op_u *u)
 885 {
 886         struct nfsd4_secinfo *secinfo = &u->secinfo;
 887         struct svc_export *exp;
 888         struct dentry *dentry;
 889         __be32 err;
 890
 891         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 892         if (err)
 893                 return err;
 894         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 895                                     secinfo->si_name, secinfo->si_namelen,
 896                                     &exp, &dentry);
 897         if (err)
 898                 return err;
 899         fh_unlock(&cstate->current_fh);
 900         if (d_really_is_negative(dentry)) {
 901                 exp_put(exp);
 902                 err = nfserr_noent;
 903         } else
 904                 secinfo->si_exp = exp;
 905         dput(dentry);
 906         if (cstate->minorversion)
 907                 /* See rfc 5661 section 2.6.3.1.1.8 */
 908                 fh_put(&cstate->current_fh);
 909         return err;
 910 }
 911
 912 static __be32
 913 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 914                 union nfsd4_op_u *u)
 915 {
 916         __be32 err;
 917
 918         switch (u->secinfo_no_name.sin_style) {
 919         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 920                 break;
 921         case NFS4_SECINFO_STYLE4_PARENT:
 922                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 923                 if (err)
 924                         return err;
 925                 break;
 926         default:
 927                 return nfserr_inval;
 928         }
 929
 930         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 931         fh_put(&cstate->current_fh);
 932         return nfs_ok;
 933 }
 934
 935 static void
 936 nfsd4_secinfo_release(union nfsd4_op_u *u)
 937 {
 938         if (u->secinfo.si_exp)
 939                 exp_put(u->secinfo.si_exp);
 940 }
 941
 942 static void
 943 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
 944 {
 945         if (u->secinfo_no_name.sin_exp)
 946                 exp_put(u->secinfo_no_name.sin_exp);
 947 }
 948
 949 static __be32
 950 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 951               union nfsd4_op_u *u)
 952 {
 953         struct nfsd4_setattr *setattr = &u->setattr;
 954         __be32 status = nfs_ok;
 955         int err;
 956
 957         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 958                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 959                                 &cstate->current_fh, &setattr->sa_stateid,
 960                                 WR_STATE, NULL, NULL);
 961                 if (status) {
 962                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 963                         return status;
 964                 }
 965         }
 966         err = fh_want_write(&cstate->current_fh);
 967         if (err)
 968                 return nfserrno(err);
 969         status = nfs_ok;
 970
 971         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 972                                     nfsd_attrmask);
 973         if (status)
 974                 goto out;
 975
 976         if (setattr->sa_acl != NULL)
 977                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 978                                             setattr->sa_acl);
 979         if (status)
 980                 goto out;
 981         if (setattr->sa_label.len)
 982                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 983                                 &setattr->sa_label);
 984         if (status)
 985                 goto out;
 986         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 987                                 0, (time64_t)0);
 988 out:
 989         fh_drop_write(&cstate->current_fh);
 990         return status;
 991 }
 992
 993 static __be32
 994 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 995             union nfsd4_op_u *u)
 996 {
 997         struct nfsd4_write *write = &u->write;
 998         stateid_t *stateid = &write->wr_stateid;
 999         struct nfsd_file *nf = NULL;
1000         __be32 status = nfs_ok;
1001         unsigned long cnt;
1002         int nvecs;
1003
1004         if (write->wr_offset >= OFFSET_MAX)
1005                 return nfserr_inval;
1006
1007         cnt = write->wr_buflen;
1008         trace_nfsd_write_start(rqstp, &cstate->current_fh,
1009                                write->wr_offset, cnt);
1010         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1011                                                 stateid, WR_STATE, &nf, NULL);
1012         if (status) {
1013                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1014                 return status;
1015         }
1016
1017         write->wr_how_written = write->wr_stable_how;
1018
1019         nvecs = svc_fill_write_vector(rqstp, write->wr_pagelist,
1020                                       &write->wr_head, write->wr_buflen);
1021         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1022
1023         status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
1024                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1025                                 write->wr_how_written,
1026                                 (__be32 *)write->wr_verifier.data);
1027         nfsd_file_put(nf);
1028
1029         write->wr_bytes_written = cnt;
1030         trace_nfsd_write_done(rqstp, &cstate->current_fh,
1031                               write->wr_offset, cnt);
1032         return status;
1033 }
1034
1035 static __be32
1036 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1037                   stateid_t *src_stateid, struct nfsd_file **src,
1038                   stateid_t *dst_stateid, struct nfsd_file **dst)
1039 {
1040         __be32 status;
1041
1042         if (!cstate->save_fh.fh_dentry)
1043                 return nfserr_nofilehandle;
1044
1045         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1046                                             src_stateid, RD_STATE, src, NULL);
1047         if (status) {
1048                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1049                 goto out;
1050         }
1051
1052         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1053                                             dst_stateid, WR_STATE, dst, NULL);
1054         if (status) {
1055                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1056                 goto out_put_src;
1057         }
1058
1059         /* fix up for NFS-specific error code */
1060         if (!S_ISREG(file_inode((*src)->nf_file)->i_mode) ||
1061             !S_ISREG(file_inode((*dst)->nf_file)->i_mode)) {
1062                 status = nfserr_wrong_type;
1063                 goto out_put_dst;
1064         }
1065
1066 out:
1067         return status;
1068 out_put_dst:
1069         nfsd_file_put(*dst);
1070 out_put_src:
1071         nfsd_file_put(*src);
1072         goto out;
1073 }
1074
1075 static __be32
1076 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1077                 union nfsd4_op_u *u)
1078 {
1079         struct nfsd4_clone *clone = &u->clone;
1080         struct nfsd_file *src, *dst;
1081         __be32 status;
1082
1083         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1084                                    &clone->cl_dst_stateid, &dst);
1085         if (status)
1086                 goto out;
1087
1088         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1089                         dst, clone->cl_dst_pos, clone->cl_count,
1090                         EX_ISSYNC(cstate->current_fh.fh_export));
1091
1092         nfsd_file_put(dst);
1093         nfsd_file_put(src);
1094 out:
1095         return status;
1096 }
1097
1098 void nfs4_put_copy(struct nfsd4_copy *copy)
1099 {
1100         if (!refcount_dec_and_test(&copy->refcount))
1101                 return;
1102         kfree(copy);
1103 }
1104
1105 static bool
1106 check_and_set_stop_copy(struct nfsd4_copy *copy)
1107 {
1108         bool value;
1109
1110         spin_lock(&copy->cp_clp->async_lock);
1111         value = copy->stopped;
1112         if (!copy->stopped)
1113                 copy->stopped = true;
1114         spin_unlock(&copy->cp_clp->async_lock);
1115         return value;
1116 }
1117
1118 static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1119 {
1120         /* only 1 thread should stop the copy */
1121         if (!check_and_set_stop_copy(copy))
1122                 kthread_stop(copy->copy_task);
1123         nfs4_put_copy(copy);
1124 }
1125
1126 static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
1127 {
1128         struct nfsd4_copy *copy = NULL;
1129
1130         spin_lock(&clp->async_lock);
1131         if (!list_empty(&clp->async_copies)) {
1132                 copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1133                                         copies);
1134                 refcount_inc(&copy->refcount);
1135         }
1136         spin_unlock(&clp->async_lock);
1137         return copy;
1138 }
1139
1140 void nfsd4_shutdown_copy(struct nfs4_client *clp)
1141 {
1142         struct nfsd4_copy *copy;
1143
1144         while ((copy = nfsd4_get_copy(clp)) != NULL)
1145                 nfsd4_stop_copy(copy);
1146 }
1147 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
1148
1149 extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1150                                    struct nfs_fh *src_fh,
1151                                    nfs4_stateid *stateid);
1152 extern void nfs42_ssc_close(struct file *filep);
1153
1154 extern void nfs_sb_deactive(struct super_block *sb);
1155
1156 #define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
1157
1158 /**
1159  * Support one copy source server for now.
1160  */
1161 static __be32
1162 nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
1163                        struct vfsmount **mount)
1164 {
1165         struct file_system_type *type;
1166         struct vfsmount *ss_mnt;
1167         struct nfs42_netaddr *naddr;
1168         struct sockaddr_storage tmp_addr;
1169         size_t tmp_addrlen, match_netid_len = 3;
1170         char *startsep = "", *endsep = "", *match_netid = "tcp";
1171         char *ipaddr, *dev_name, *raw_data;
1172         int len, raw_len;
1173         __be32 status = nfserr_inval;
1174
1175         naddr = &nss->u.nl4_addr;
1176         tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
1177                                          naddr->addr_len,
1178                                          (struct sockaddr *)&tmp_addr,
1179                                          sizeof(tmp_addr));
1180         if (tmp_addrlen == 0)
1181                 goto out_err;
1182
1183         if (tmp_addr.ss_family == AF_INET6) {
1184                 startsep = "[";
1185                 endsep = "]";
1186                 match_netid = "tcp6";
1187                 match_netid_len = 4;
1188         }
1189
1190         if (naddr->netid_len != match_netid_len ||
1191                 strncmp(naddr->netid, match_netid, naddr->netid_len))
1192                 goto out_err;
1193
1194         /* Construct the raw data for the vfs_kern_mount call */
1195         len = RPC_MAX_ADDRBUFLEN + 1;
1196         ipaddr = kzalloc(len, GFP_KERNEL);
1197         if (!ipaddr)
1198                 goto out_err;
1199
1200         rpc_ntop((struct sockaddr *)&tmp_addr, ipaddr, len);
1201
1202         /* 2 for ipv6 endsep and startsep. 3 for ":/" and trailing '/0'*/
1203
1204         raw_len = strlen(NFSD42_INTERSSC_MOUNTOPS) + strlen(ipaddr);
1205         raw_data = kzalloc(raw_len, GFP_KERNEL);
1206         if (!raw_data)
1207                 goto out_free_ipaddr;
1208
1209         snprintf(raw_data, raw_len, NFSD42_INTERSSC_MOUNTOPS, ipaddr);
1210
1211         status = nfserr_nodev;
1212         type = get_fs_type("nfs");
1213         if (!type)
1214                 goto out_free_rawdata;
1215
1216         /* Set the server:<export> for the vfs_kern_mount call */
1217         dev_name = kzalloc(len + 5, GFP_KERNEL);
1218         if (!dev_name)
1219                 goto out_free_rawdata;
1220         snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
1221
1222         /* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
1223         ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
1224         module_put(type->owner);
1225         if (IS_ERR(ss_mnt))
1226                 goto out_free_devname;
1227
1228         status = 0;
1229         *mount = ss_mnt;
1230
1231 out_free_devname:
1232         kfree(dev_name);
1233 out_free_rawdata:
1234         kfree(raw_data);
1235 out_free_ipaddr:
1236         kfree(ipaddr);
1237 out_err:
1238         return status;
1239 }
1240
1241 static void
1242 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1243 {
1244         nfs_sb_deactive(ss_mnt->mnt_sb);
1245         mntput(ss_mnt);
1246 }
1247
1248 /**
1249  * nfsd4_setup_inter_ssc
1250  *
1251  * Verify COPY destination stateid.
1252  * Connect to the source server with NFSv4.1.
1253  * Create the source struct file for nfsd_copy_range.
1254  * Called with COPY cstate:
1255  *    SAVED_FH: source filehandle
1256  *    CURRENT_FH: destination filehandle
1257  */
1258 static __be32
1259 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1260                       struct nfsd4_compound_state *cstate,
1261                       struct nfsd4_copy *copy, struct vfsmount **mount)
1262 {
1263         struct svc_fh *s_fh = NULL;
1264         stateid_t *s_stid = &copy->cp_src_stateid;
1265         __be32 status = nfserr_inval;
1266
1267         /* Verify the destination stateid and set dst struct file*/
1268         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1269                                             &copy->cp_dst_stateid,
1270                                             WR_STATE, &copy->nf_dst, NULL);
1271         if (status)
1272                 goto out;
1273
1274         status = nfsd4_interssc_connect(&copy->cp_src, rqstp, mount);
1275         if (status)
1276                 goto out;
1277
1278         s_fh = &cstate->save_fh;
1279
1280         copy->c_fh.size = s_fh->fh_handle.fh_size;
1281         memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_base, copy->c_fh.size);
1282         copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1283         memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1284                sizeof(stateid_opaque_t));
1285
1286         status = 0;
1287 out:
1288         return status;
1289 }
1290
1291 static void
1292 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src,
1293                         struct nfsd_file *dst)
1294 {
1295         nfs42_ssc_close(src->nf_file);
1296         nfsd_file_put(src);
1297         nfsd_file_put(dst);
1298         mntput(ss_mnt);
1299 }
1300
1301 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
1302
1303 static __be32
1304 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1305                       struct nfsd4_compound_state *cstate,
1306                       struct nfsd4_copy *copy,
1307                       struct vfsmount **mount)
1308 {
1309         *mount = NULL;
1310         return nfserr_inval;
1311 }
1312
1313 static void
1314 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src,
1315                         struct nfsd_file *dst)
1316 {
1317 }
1318
1319 static void
1320 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1321 {
1322 }
1323
1324 static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1325                                    struct nfs_fh *src_fh,
1326                                    nfs4_stateid *stateid)
1327 {
1328         return NULL;
1329 }
1330 #endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1331
1332 static __be32
1333 nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1334                       struct nfsd4_compound_state *cstate,
1335                       struct nfsd4_copy *copy)
1336 {
1337         return nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
1338                                  &copy->nf_src, &copy->cp_dst_stateid,
1339                                  &copy->nf_dst);
1340 }
1341
1342 static void
1343 nfsd4_cleanup_intra_ssc(struct nfsd_file *src, struct nfsd_file *dst)
1344 {
1345         nfsd_file_put(src);
1346         nfsd_file_put(dst);
1347 }
1348
1349 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1350 {
1351         struct nfsd4_copy *copy = container_of(cb, struct nfsd4_copy, cp_cb);
1352
1353         nfs4_put_copy(copy);
1354 }
1355
1356 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1357                                  struct rpc_task *task)
1358 {
1359         return 1;
1360 }
1361
1362 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1363         .release = nfsd4_cb_offload_release,
1364         .done = nfsd4_cb_offload_done
1365 };
1366
1367 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1368 {
1369         copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1370         copy->cp_synchronous = sync;
1371         gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
1372 }
1373
1374 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy)
1375 {
1376         ssize_t bytes_copied = 0;
1377         size_t bytes_total = copy->cp_count;
1378         u64 src_pos = copy->cp_src_pos;
1379         u64 dst_pos = copy->cp_dst_pos;
1380
1381         do {
1382                 if (kthread_should_stop())
1383                         break;
1384                 bytes_copied = nfsd_copy_file_range(copy->nf_src->nf_file,
1385                                 src_pos, copy->nf_dst->nf_file, dst_pos,
1386                                 bytes_total);
1387                 if (bytes_copied <= 0)
1388                         break;
1389                 bytes_total -= bytes_copied;
1390                 copy->cp_res.wr_bytes_written += bytes_copied;
1391                 src_pos += bytes_copied;
1392                 dst_pos += bytes_copied;
1393         } while (bytes_total > 0 && !copy->cp_synchronous);
1394         return bytes_copied;
1395 }
1396
1397 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy, bool sync)
1398 {
1399         __be32 status;
1400         ssize_t bytes;
1401
1402         bytes = _nfsd_copy_file_range(copy);
1403         /* for async copy, we ignore the error, client can always retry
1404          * to get the error
1405          */
1406         if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1407                 status = nfserrno(bytes);
1408         else {
1409                 nfsd4_init_copy_res(copy, sync);
1410                 status = nfs_ok;
1411         }
1412
1413         if (!copy->cp_intra) /* Inter server SSC */
1414                 nfsd4_cleanup_inter_ssc(copy->ss_mnt, copy->nf_src,
1415                                         copy->nf_dst);
1416         else
1417                 nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
1418
1419         return status;
1420 }
1421
1422 static int dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1423 {
1424         dst->cp_src_pos = src->cp_src_pos;
1425         dst->cp_dst_pos = src->cp_dst_pos;
1426         dst->cp_count = src->cp_count;
1427         dst->cp_synchronous = src->cp_synchronous;
1428         memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1429         memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1430         dst->cp_clp = src->cp_clp;
1431         dst->nf_dst = nfsd_file_get(src->nf_dst);
1432         dst->cp_intra = src->cp_intra;
1433         if (src->cp_intra) /* for inter, file_src doesn't exist yet */
1434                 dst->nf_src = nfsd_file_get(src->nf_src);
1435
1436         memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1437         memcpy(&dst->cp_src, &src->cp_src, sizeof(struct nl4_server));
1438         memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1439         memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1440         dst->ss_mnt = src->ss_mnt;
1441
1442         return 0;
1443 }
1444
1445 static void cleanup_async_copy(struct nfsd4_copy *copy)
1446 {
1447         nfs4_free_copy_state(copy);
1448         nfsd_file_put(copy->nf_dst);
1449         if (copy->cp_intra)
1450                 nfsd_file_put(copy->nf_src);
1451         spin_lock(&copy->cp_clp->async_lock);
1452         list_del(&copy->copies);
1453         spin_unlock(&copy->cp_clp->async_lock);
1454         nfs4_put_copy(copy);
1455 }
1456
1457 static int nfsd4_do_async_copy(void *data)
1458 {
1459         struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1460         struct nfsd4_copy *cb_copy;
1461
1462         if (!copy->cp_intra) { /* Inter server SSC */
1463                 copy->nf_src = kzalloc(sizeof(struct nfsd_file), GFP_KERNEL);
1464                 if (!copy->nf_src) {
1465                         copy->nfserr = nfserr_serverfault;
1466                         nfsd4_interssc_disconnect(copy->ss_mnt);
1467                         goto do_callback;
1468                 }
1469                 copy->nf_src->nf_file = nfs42_ssc_open(copy->ss_mnt, &copy->c_fh,
1470                                               &copy->stateid);
1471                 if (IS_ERR(copy->nf_src->nf_file)) {
1472                         copy->nfserr = nfserr_offload_denied;
1473                         nfsd4_interssc_disconnect(copy->ss_mnt);
1474                         goto do_callback;
1475                 }
1476         }
1477
1478         copy->nfserr = nfsd4_do_copy(copy, 0);
1479 do_callback:
1480         cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1481         if (!cb_copy)
1482                 goto out;
1483         memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
1484         cb_copy->cp_clp = copy->cp_clp;
1485         cb_copy->nfserr = copy->nfserr;
1486         memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
1487         nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
1488                         &nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
1489         nfsd4_run_cb(&cb_copy->cp_cb);
1490 out:
1491         if (!copy->cp_intra)
1492                 kfree(copy->nf_src);
1493         cleanup_async_copy(copy);
1494         return 0;
1495 }
1496
1497 static __be32
1498 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1499                 union nfsd4_op_u *u)
1500 {
1501         struct nfsd4_copy *copy = &u->copy;
1502         __be32 status;
1503         struct nfsd4_copy *async_copy = NULL;
1504
1505         if (!copy->cp_intra) { /* Inter server SSC */
1506                 if (!inter_copy_offload_enable || copy->cp_synchronous) {
1507                         status = nfserr_notsupp;
1508                         goto out;
1509                 }
1510                 status = nfsd4_setup_inter_ssc(rqstp, cstate, copy,
1511                                 &copy->ss_mnt);
1512                 if (status)
1513                         return nfserr_offload_denied;
1514         } else {
1515                 status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1516                 if (status)
1517                         return status;
1518         }
1519
1520         copy->cp_clp = cstate->clp;
1521         memcpy(&copy->fh, &cstate->current_fh.fh_handle,
1522                 sizeof(struct knfsd_fh));
1523         if (!copy->cp_synchronous) {
1524                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1525
1526                 status = nfserrno(-ENOMEM);
1527                 async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1528                 if (!async_copy)
1529                         goto out_err;
1530                 if (!nfs4_init_copy_state(nn, copy))
1531                         goto out_err;
1532                 refcount_set(&async_copy->refcount, 1);
1533                 memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid,
1534                         sizeof(copy->cp_stateid));
1535                 status = dup_copy_fields(copy, async_copy);
1536                 if (status)
1537                         goto out_err;
1538                 async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1539                                 async_copy, "%s", "copy thread");
1540                 if (IS_ERR(async_copy->copy_task))
1541                         goto out_err;
1542                 spin_lock(&async_copy->cp_clp->async_lock);
1543                 list_add(&async_copy->copies,
1544                                 &async_copy->cp_clp->async_copies);
1545                 spin_unlock(&async_copy->cp_clp->async_lock);
1546                 wake_up_process(async_copy->copy_task);
1547                 status = nfs_ok;
1548         } else {
1549                 status = nfsd4_do_copy(copy, 1);
1550         }
1551 out:
1552         return status;
1553 out_err:
1554         if (async_copy)
1555                 cleanup_async_copy(async_copy);
1556         status = nfserrno(-ENOMEM);
1557         if (!copy->cp_intra)
1558                 nfsd4_interssc_disconnect(copy->ss_mnt);
1559         goto out;
1560 }
1561
1562 struct nfsd4_copy *
1563 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1564 {
1565         struct nfsd4_copy *copy;
1566
1567         spin_lock(&clp->async_lock);
1568         list_for_each_entry(copy, &clp->async_copies, copies) {
1569                 if (memcmp(&copy->cp_stateid.stid, stateid, NFS4_STATEID_SIZE))
1570                         continue;
1571                 refcount_inc(&copy->refcount);
1572                 spin_unlock(&clp->async_lock);
1573                 return copy;
1574         }
1575         spin_unlock(&clp->async_lock);
1576         return NULL;
1577 }
1578
1579 static __be32
1580 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1581                      struct nfsd4_compound_state *cstate,
1582                      union nfsd4_op_u *u)
1583 {
1584         struct nfsd4_offload_status *os = &u->offload_status;
1585         struct nfsd4_copy *copy;
1586         struct nfs4_client *clp = cstate->clp;
1587
1588         copy = find_async_copy(clp, &os->stateid);
1589         if (!copy) {
1590                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1591
1592                 return manage_cpntf_state(nn, &os->stateid, clp, NULL);
1593         } else
1594                 nfsd4_stop_copy(copy);
1595
1596         return nfs_ok;
1597 }
1598
1599 static __be32
1600 nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1601                   union nfsd4_op_u *u)
1602 {
1603         struct nfsd4_copy_notify *cn = &u->copy_notify;
1604         __be32 status;
1605         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1606         struct nfs4_stid *stid;
1607         struct nfs4_cpntf_state *cps;
1608         struct nfs4_client *clp = cstate->clp;
1609
1610         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1611                                         &cn->cpn_src_stateid, RD_STATE, NULL,
1612                                         &stid);
1613         if (status)
1614                 return status;
1615
1616         cn->cpn_sec = nn->nfsd4_lease;
1617         cn->cpn_nsec = 0;
1618
1619         status = nfserrno(-ENOMEM);
1620         cps = nfs4_alloc_init_cpntf_state(nn, stid);
1621         if (!cps)
1622                 goto out;
1623         memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.stid, sizeof(stateid_t));
1624         memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
1625         memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
1626
1627         /* For now, only return one server address in cpn_src, the
1628          * address used by the client to connect to this server.
1629          */
1630         cn->cpn_src.nl4_type = NL4_NETADDR;
1631         status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
1632                                  &cn->cpn_src.u.nl4_addr);
1633         WARN_ON_ONCE(status);
1634         if (status) {
1635                 nfs4_put_cpntf_state(nn, cps);
1636                 goto out;
1637         }
1638 out:
1639         nfs4_put_stid(stid);
1640         return status;
1641 }
1642
1643 static __be32
1644 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1645                 struct nfsd4_fallocate *fallocate, int flags)
1646 {
1647         __be32 status;
1648         struct nfsd_file *nf;
1649
1650         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1651                                             &fallocate->falloc_stateid,
1652                                             WR_STATE, &nf, NULL);
1653         if (status != nfs_ok) {
1654                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1655                 return status;
1656         }
1657
1658         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
1659                                      fallocate->falloc_offset,
1660                                      fallocate->falloc_length,
1661                                      flags);
1662         nfsd_file_put(nf);
1663         return status;
1664 }
1665 static __be32
1666 nfsd4_offload_status(struct svc_rqst *rqstp,
1667                      struct nfsd4_compound_state *cstate,
1668                      union nfsd4_op_u *u)
1669 {
1670         struct nfsd4_offload_status *os = &u->offload_status;
1671         __be32 status = 0;
1672         struct nfsd4_copy *copy;
1673         struct nfs4_client *clp = cstate->clp;
1674
1675         copy = find_async_copy(clp, &os->stateid);
1676         if (copy) {
1677                 os->count = copy->cp_res.wr_bytes_written;
1678                 nfs4_put_copy(copy);
1679         } else
1680                 status = nfserr_bad_stateid;
1681
1682         return status;
1683 }
1684
1685 static __be32
1686 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1687                union nfsd4_op_u *u)
1688 {
1689         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1690 }
1691
1692 static __be32
1693 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1694                  union nfsd4_op_u *u)
1695 {
1696         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1697                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1698 }
1699
1700 static __be32
1701 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1702            union nfsd4_op_u *u)
1703 {
1704         struct nfsd4_seek *seek = &u->seek;
1705         int whence;
1706         __be32 status;
1707         struct nfsd_file *nf;
1708
1709         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1710                                             &seek->seek_stateid,
1711                                             RD_STATE, &nf, NULL);
1712         if (status) {
1713                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1714                 return status;
1715         }
1716
1717         switch (seek->seek_whence) {
1718         case NFS4_CONTENT_DATA:
1719                 whence = SEEK_DATA;
1720                 break;
1721         case NFS4_CONTENT_HOLE:
1722                 whence = SEEK_HOLE;
1723                 break;
1724         default:
1725                 status = nfserr_union_notsupp;
1726                 goto out;
1727         }
1728
1729         /*
1730          * Note:  This call does change file->f_pos, but nothing in NFSD
1731          *        should ever file->f_pos.
1732          */
1733         seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
1734         if (seek->seek_pos < 0)
1735                 status = nfserrno(seek->seek_pos);
1736         else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
1737                 seek->seek_eof = true;
1738
1739 out:
1740         nfsd_file_put(nf);
1741         return status;
1742 }
1743
1744 /* This routine never returns NFS_OK!  If there are no other errors, it
1745  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1746  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1747  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1748  */
1749 static __be32
1750 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1751              struct nfsd4_verify *verify)
1752 {
1753         __be32 *buf, *p;
1754         int count;
1755         __be32 status;
1756
1757         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1758         if (status)
1759                 return status;
1760
1761         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1762         if (status)
1763                 return status;
1764
1765         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1766             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1767                 return nfserr_inval;
1768         if (verify->ve_attrlen & 3)
1769                 return nfserr_inval;
1770
1771         /* count in words:
1772          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1773          */
1774         count = 4 + (verify->ve_attrlen >> 2);
1775         buf = kmalloc(count << 2, GFP_KERNEL);
1776         if (!buf)
1777                 return nfserr_jukebox;
1778
1779         p = buf;
1780         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1781                                     cstate->current_fh.fh_export,
1782                                     cstate->current_fh.fh_dentry,
1783                                     verify->ve_bmval,
1784                                     rqstp, 0);
1785         /*
1786          * If nfsd4_encode_fattr() ran out of space, assume that's because
1787          * the attributes are longer (hence different) than those given:
1788          */
1789         if (status == nfserr_resource)
1790                 status = nfserr_not_same;
1791         if (status)
1792                 goto out_kfree;
1793
1794         /* skip bitmap */
1795         p = buf + 1 + ntohl(buf[0]);
1796         status = nfserr_not_same;
1797         if (ntohl(*p++) != verify->ve_attrlen)
1798                 goto out_kfree;
1799         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1800                 status = nfserr_same;
1801
1802 out_kfree:
1803         kfree(buf);
1804         return status;
1805 }
1806
1807 static __be32
1808 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1809               union nfsd4_op_u *u)
1810 {
1811         __be32 status;
1812
1813         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1814         return status == nfserr_not_same ? nfs_ok : status;
1815 }
1816
1817 static __be32
1818 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1819              union nfsd4_op_u *u)
1820 {
1821         __be32 status;
1822
1823         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1824         return status == nfserr_same ? nfs_ok : status;
1825 }
1826
1827 #ifdef CONFIG_NFSD_PNFS
1828 static const struct nfsd4_layout_ops *
1829 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1830 {
1831         if (!exp->ex_layout_types) {
1832                 dprintk("%s: export does not support pNFS\n", __func__);
1833                 return NULL;
1834         }
1835
1836         if (layout_type >= LAYOUT_TYPE_MAX ||
1837             !(exp->ex_layout_types & (1 << layout_type))) {
1838                 dprintk("%s: layout type %d not supported\n",
1839                         __func__, layout_type);
1840                 return NULL;
1841         }
1842
1843         return nfsd4_layout_ops[layout_type];
1844 }
1845
1846 static __be32
1847 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1848                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1849 {
1850         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1851         const struct nfsd4_layout_ops *ops;
1852         struct nfsd4_deviceid_map *map;
1853         struct svc_export *exp;
1854         __be32 nfserr;
1855
1856         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1857                __func__,
1858                gdp->gd_layout_type,
1859                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1860                gdp->gd_maxcount);
1861
1862         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1863         if (!map) {
1864                 dprintk("%s: couldn't find device ID to export mapping!\n",
1865                         __func__);
1866                 return nfserr_noent;
1867         }
1868
1869         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1870         if (IS_ERR(exp)) {
1871                 dprintk("%s: could not find device id\n", __func__);
1872                 return nfserr_noent;
1873         }
1874
1875         nfserr = nfserr_layoutunavailable;
1876         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1877         if (!ops)
1878                 goto out;
1879
1880         nfserr = nfs_ok;
1881         if (gdp->gd_maxcount != 0) {
1882                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1883                                 rqstp, cstate->session->se_client, gdp);
1884         }
1885
1886         gdp->gd_notify_types &= ops->notify_types;
1887 out:
1888         exp_put(exp);
1889         return nfserr;
1890 }
1891
1892 static void
1893 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1894 {
1895         kfree(u->getdeviceinfo.gd_device);
1896 }
1897
1898 static __be32
1899 nfsd4_layoutget(struct svc_rqst *rqstp,
1900                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1901 {
1902         struct nfsd4_layoutget *lgp = &u->layoutget;
1903         struct svc_fh *current_fh = &cstate->current_fh;
1904         const struct nfsd4_layout_ops *ops;
1905         struct nfs4_layout_stateid *ls;
1906         __be32 nfserr;
1907         int accmode = NFSD_MAY_READ_IF_EXEC;
1908
1909         switch (lgp->lg_seg.iomode) {
1910         case IOMODE_READ:
1911                 accmode |= NFSD_MAY_READ;
1912                 break;
1913         case IOMODE_RW:
1914                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
1915                 break;
1916         default:
1917                 dprintk("%s: invalid iomode %d\n",
1918                         __func__, lgp->lg_seg.iomode);
1919                 nfserr = nfserr_badiomode;
1920                 goto out;
1921         }
1922
1923         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1924         if (nfserr)
1925                 goto out;
1926
1927         nfserr = nfserr_layoutunavailable;
1928         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1929         if (!ops)
1930                 goto out;
1931
1932         /*
1933          * Verify minlength and range as per RFC5661:
1934          *  o  If loga_length is less than loga_minlength,
1935          *     the metadata server MUST return NFS4ERR_INVAL.
1936          *  o  If the sum of loga_offset and loga_minlength exceeds
1937          *     NFS4_UINT64_MAX, and loga_minlength is not
1938          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1939          *  o  If the sum of loga_offset and loga_length exceeds
1940          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1941          *     the error NFS4ERR_INVAL MUST result.
1942          */
1943         nfserr = nfserr_inval;
1944         if (lgp->lg_seg.length < lgp->lg_minlength ||
1945             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1946              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1947             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1948              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1949                 goto out;
1950         if (lgp->lg_seg.length == 0)
1951                 goto out;
1952
1953         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1954                                                 true, lgp->lg_layout_type, &ls);
1955         if (nfserr) {
1956                 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
1957                 goto out;
1958         }
1959
1960         nfserr = nfserr_recallconflict;
1961         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1962                 goto out_put_stid;
1963
1964         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1965                                      current_fh, lgp);
1966         if (nfserr)
1967                 goto out_put_stid;
1968
1969         nfserr = nfsd4_insert_layout(lgp, ls);
1970
1971 out_put_stid:
1972         mutex_unlock(&ls->ls_mutex);
1973         nfs4_put_stid(&ls->ls_stid);
1974 out:
1975         return nfserr;
1976 }
1977
1978 static void
1979 nfsd4_layoutget_release(union nfsd4_op_u *u)
1980 {
1981         kfree(u->layoutget.lg_content);
1982 }
1983
1984 static __be32
1985 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1986                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1987 {
1988         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1989         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1990         struct svc_fh *current_fh = &cstate->current_fh;
1991         const struct nfsd4_layout_ops *ops;
1992         loff_t new_size = lcp->lc_last_wr + 1;
1993         struct inode *inode;
1994         struct nfs4_layout_stateid *ls;
1995         __be32 nfserr;
1996
1997         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1998         if (nfserr)
1999                 goto out;
2000
2001         nfserr = nfserr_layoutunavailable;
2002         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2003         if (!ops)
2004                 goto out;
2005         inode = d_inode(current_fh->fh_dentry);
2006
2007         nfserr = nfserr_inval;
2008         if (new_size <= seg->offset) {
2009                 dprintk("pnfsd: last write before layout segment\n");
2010                 goto out;
2011         }
2012         if (new_size > seg->offset + seg->length) {
2013                 dprintk("pnfsd: last write beyond layout segment\n");
2014                 goto out;
2015         }
2016         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2017                 dprintk("pnfsd: layoutcommit beyond EOF\n");
2018                 goto out;
2019         }
2020
2021         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2022                                                 false, lcp->lc_layout_type,
2023                                                 &ls);
2024         if (nfserr) {
2025                 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2026                 /* fixup error code as per RFC5661 */
2027                 if (nfserr == nfserr_bad_stateid)
2028                         nfserr = nfserr_badlayout;
2029                 goto out;
2030         }
2031
2032         /* LAYOUTCOMMIT does not require any serialization */
2033         mutex_unlock(&ls->ls_mutex);
2034
2035         if (new_size > i_size_read(inode)) {
2036                 lcp->lc_size_chg = 1;
2037                 lcp->lc_newsize = new_size;
2038         } else {
2039                 lcp->lc_size_chg = 0;
2040         }
2041
2042         nfserr = ops->proc_layoutcommit(inode, lcp);
2043         nfs4_put_stid(&ls->ls_stid);
2044 out:
2045         return nfserr;
2046 }
2047
2048 static __be32
2049 nfsd4_layoutreturn(struct svc_rqst *rqstp,
2050                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2051 {
2052         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2053         struct svc_fh *current_fh = &cstate->current_fh;
2054         __be32 nfserr;
2055
2056         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2057         if (nfserr)
2058                 goto out;
2059
2060         nfserr = nfserr_layoutunavailable;
2061         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2062                 goto out;
2063
2064         switch (lrp->lr_seg.iomode) {
2065         case IOMODE_READ:
2066         case IOMODE_RW:
2067         case IOMODE_ANY:
2068                 break;
2069         default:
2070                 dprintk("%s: invalid iomode %d\n", __func__,
2071                         lrp->lr_seg.iomode);
2072                 nfserr = nfserr_inval;
2073                 goto out;
2074         }
2075
2076         switch (lrp->lr_return_type) {
2077         case RETURN_FILE:
2078                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2079                 break;
2080         case RETURN_FSID:
2081         case RETURN_ALL:
2082                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2083                 break;
2084         default:
2085                 dprintk("%s: invalid return_type %d\n", __func__,
2086                         lrp->lr_return_type);
2087                 nfserr = nfserr_inval;
2088                 break;
2089         }
2090 out:
2091         return nfserr;
2092 }
2093 #endif /* CONFIG_NFSD_PNFS */
2094
2095 /*
2096  * NULL call.
2097  */
2098 static __be32
2099 nfsd4_proc_null(struct svc_rqst *rqstp)
2100 {
2101         return nfs_ok;
2102 }
2103
2104 static inline void nfsd4_increment_op_stats(u32 opnum)
2105 {
2106         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2107                 nfsdstats.nfs4_opcount[opnum]++;
2108 }
2109
2110 static const struct nfsd4_operation nfsd4_ops[];
2111
2112 static const char *nfsd4_op_name(unsigned opnum);
2113
2114 /*
2115  * Enforce NFSv4.1 COMPOUND ordering rules:
2116  *
2117  * Also note, enforced elsewhere:
2118  *      - SEQUENCE other than as first op results in
2119  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2120  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
2121  *        (Enforced in nfsd4_bind_conn_to_session().)
2122  *      - DESTROY_SESSION must be the final operation in a compound, if
2123  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2124  *        (Enforced in nfsd4_destroy_session().)
2125  */
2126 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2127 {
2128         struct nfsd4_op *first_op = &args->ops[0];
2129
2130         /* These ordering requirements don't apply to NFSv4.0: */
2131         if (args->minorversion == 0)
2132                 return nfs_ok;
2133         /* This is weird, but OK, not our problem: */
2134         if (args->opcnt == 0)
2135                 return nfs_ok;
2136         if (first_op->status == nfserr_op_illegal)
2137                 return nfs_ok;
2138         if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2139                 return nfserr_op_not_in_session;
2140         if (first_op->opnum == OP_SEQUENCE)
2141                 return nfs_ok;
2142         /*
2143          * So first_op is something allowed outside a session, like
2144          * EXCHANGE_ID; but then it has to be the only op in the
2145          * compound:
2146          */
2147         if (args->opcnt != 1)
2148                 return nfserr_not_only_op;
2149         return nfs_ok;
2150 }
2151
2152 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2153 {
2154         return &nfsd4_ops[op->opnum];
2155 }
2156
2157 bool nfsd4_cache_this_op(struct nfsd4_op *op)
2158 {
2159         if (op->opnum == OP_ILLEGAL)
2160                 return false;
2161         return OPDESC(op)->op_flags & OP_CACHEME;
2162 }
2163
2164 static bool need_wrongsec_check(struct svc_rqst *rqstp)
2165 {
2166         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2167         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2168         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2169         struct nfsd4_op *next = &argp->ops[resp->opcnt];
2170         const struct nfsd4_operation *thisd = OPDESC(this);
2171         const struct nfsd4_operation *nextd;
2172
2173         /*
2174          * Most ops check wronsec on our own; only the putfh-like ops
2175          * have special rules.
2176          */
2177         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2178                 return false;
2179         /*
2180          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2181          * put-filehandle operation if we're not going to use the
2182          * result:
2183          */
2184         if (argp->opcnt == resp->opcnt)
2185                 return false;
2186         if (next->opnum == OP_ILLEGAL)
2187                 return false;
2188         nextd = OPDESC(next);
2189         /*
2190          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2191          * errors themselves as necessary; others should check for them
2192          * now:
2193          */
2194         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2195 }
2196
2197 static void svcxdr_init_encode(struct svc_rqst *rqstp,
2198                                struct nfsd4_compoundres *resp)
2199 {
2200         struct xdr_stream *xdr = &resp->xdr;
2201         struct xdr_buf *buf = &rqstp->rq_res;
2202         struct kvec *head = buf->head;
2203
2204         xdr->buf = buf;
2205         xdr->iov = head;
2206         xdr->p   = head->iov_base + head->iov_len;
2207         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
2208         /* Tail and page_len should be zero at this point: */
2209         buf->len = buf->head[0].iov_len;
2210         xdr->scratch.iov_len = 0;
2211         xdr->page_ptr = buf->pages - 1;
2212         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
2213                 - rqstp->rq_auth_slack;
2214 }
2215
2216 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
2217 static void
2218 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2219 {
2220         struct nfsd4_op *op, *current_op = NULL, *saved_op = NULL;
2221         struct nfsd4_copy *copy;
2222         struct nfsd4_putfh *putfh;
2223         int i;
2224
2225         /* traverse all operation and if it's a COPY compound, mark the
2226          * source filehandle to skip verification
2227          */
2228         for (i = 0; i < args->opcnt; i++) {
2229                 op = &args->ops[i];
2230                 if (op->opnum == OP_PUTFH)
2231                         current_op = op;
2232                 else if (op->opnum == OP_SAVEFH)
2233                         saved_op = current_op;
2234                 else if (op->opnum == OP_RESTOREFH)
2235                         current_op = saved_op;
2236                 else if (op->opnum == OP_COPY) {
2237                         copy = (struct nfsd4_copy *)&op->u;
2238                         if (!saved_op) {
2239                                 op->status = nfserr_nofilehandle;
2240                                 return;
2241                         }
2242                         putfh = (struct nfsd4_putfh *)&saved_op->u;
2243                         if (!copy->cp_intra)
2244                                 putfh->no_verify = true;
2245                 }
2246         }
2247 }
2248 #else
2249 static void
2250 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2251 {
2252 }
2253 #endif
2254
2255 /*
2256  * COMPOUND call.
2257  */
2258 static __be32
2259 nfsd4_proc_compound(struct svc_rqst *rqstp)
2260 {
2261         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2262         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2263         struct nfsd4_op *op;
2264         struct nfsd4_compound_state *cstate = &resp->cstate;
2265         struct svc_fh *current_fh = &cstate->current_fh;
2266         struct svc_fh *save_fh = &cstate->save_fh;
2267         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2268         __be32          status;
2269
2270         svcxdr_init_encode(rqstp, resp);
2271         resp->tagp = resp->xdr.p;
2272         /* reserve space for: taglen, tag, and opcnt */
2273         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
2274         resp->taglen = args->taglen;
2275         resp->tag = args->tag;
2276         resp->rqstp = rqstp;
2277         cstate->minorversion = args->minorversion;
2278         fh_init(current_fh, NFS4_FHSIZE);
2279         fh_init(save_fh, NFS4_FHSIZE);
2280         /*
2281          * Don't use the deferral mechanism for NFSv4; compounds make it
2282          * too hard to avoid non-idempotency problems.
2283          */
2284         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2285
2286         /*
2287          * According to RFC3010, this takes precedence over all other errors.
2288          */
2289         status = nfserr_minor_vers_mismatch;
2290         if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2291                 goto out;
2292         status = nfserr_resource;
2293         if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2294                 goto out;
2295
2296         status = nfs41_check_op_ordering(args);
2297         if (status) {
2298                 op = &args->ops[0];
2299                 op->status = status;
2300                 resp->opcnt = 1;
2301                 goto encode_op;
2302         }
2303         check_if_stalefh_allowed(args);
2304
2305         trace_nfsd_compound(rqstp, args->opcnt);
2306         while (!status && resp->opcnt < args->opcnt) {
2307                 op = &args->ops[resp->opcnt++];
2308
2309                 /*
2310                  * The XDR decode routines may have pre-set op->status;
2311                  * for example, if there is a miscellaneous XDR error
2312                  * it will be set to nfserr_bad_xdr.
2313                  */
2314                 if (op->status) {
2315                         if (op->opnum == OP_OPEN)
2316                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
2317                         goto encode_op;
2318                 }
2319                 if (!current_fh->fh_dentry &&
2320                                 !HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2321                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2322                                 op->status = nfserr_nofilehandle;
2323                                 goto encode_op;
2324                         }
2325                 } else if (current_fh->fh_export &&
2326                            current_fh->fh_export->ex_fslocs.migrated &&
2327                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2328                         op->status = nfserr_moved;
2329                         goto encode_op;
2330                 }
2331
2332                 fh_clear_wcc(current_fh);
2333
2334                 /* If op is non-idempotent */
2335                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2336                         /*
2337                          * Don't execute this op if we couldn't encode a
2338                          * succesful reply:
2339                          */
2340                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2341                         /*
2342                          * Plus if there's another operation, make sure
2343                          * we'll have space to at least encode an error:
2344                          */
2345                         if (resp->opcnt < args->opcnt)
2346                                 plen += COMPOUND_ERR_SLACK_SPACE;
2347                         op->status = nfsd4_check_resp_size(resp, plen);
2348                 }
2349
2350                 if (op->status)
2351                         goto encode_op;
2352
2353                 if (op->opdesc->op_get_currentstateid)
2354                         op->opdesc->op_get_currentstateid(cstate, &op->u);
2355                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2356
2357                 /* Only from SEQUENCE */
2358                 if (cstate->status == nfserr_replay_cache) {
2359                         dprintk("%s NFS4.1 replay from cache\n", __func__);
2360                         status = op->status;
2361                         goto out;
2362                 }
2363                 if (!op->status) {
2364                         if (op->opdesc->op_set_currentstateid)
2365                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
2366
2367                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2368                                 clear_current_stateid(cstate);
2369
2370                         if (current_fh->fh_export &&
2371                                         need_wrongsec_check(rqstp))
2372                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2373                 }
2374 encode_op:
2375                 if (op->status == nfserr_replay_me) {
2376                         op->replay = &cstate->replay_owner->so_replay;
2377                         nfsd4_encode_replay(&resp->xdr, op);
2378                         status = op->status = op->replay->rp_status;
2379                 } else {
2380                         nfsd4_encode_operation(resp, op);
2381                         status = op->status;
2382                 }
2383
2384                 trace_nfsd_compound_status(args->opcnt, resp->opcnt, status,
2385                                            nfsd4_op_name(op->opnum));
2386
2387                 nfsd4_cstate_clear_replay(cstate);
2388                 nfsd4_increment_op_stats(op->opnum);
2389         }
2390
2391         cstate->status = status;
2392         fh_put(current_fh);
2393         fh_put(save_fh);
2394         BUG_ON(cstate->replay_owner);
2395 out:
2396         /* Reset deferral mechanism for RPC deferrals */
2397         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2398         dprintk("nfsv4 compound returned %d\n", ntohl(status));
2399         return status;
2400 }
2401
2402 #define op_encode_hdr_size              (2)
2403 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
2404 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2405 #define op_encode_change_info_maxsz     (5)
2406 #define nfs4_fattr_bitmap_maxsz         (4)
2407
2408 /* We'll fall back on returning no lockowner if run out of space: */
2409 #define op_encode_lockowner_maxsz       (0)
2410 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
2411
2412 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
2413
2414 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
2415 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
2416                                          op_encode_ace_maxsz)
2417
2418 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
2419
2420 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2421 {
2422         return (op_encode_hdr_size) * sizeof(__be32);
2423 }
2424
2425 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2426 {
2427         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2428 }
2429
2430 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2431 {
2432         /* ac_supported, ac_resp_access */
2433         return (op_encode_hdr_size + 2)* sizeof(__be32);
2434 }
2435
2436 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2437 {
2438         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2439 }
2440
2441 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2442 {
2443         return (op_encode_hdr_size + op_encode_change_info_maxsz
2444                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2445 }
2446
2447 /*
2448  * Note since this is an idempotent operation we won't insist on failing
2449  * the op prematurely if the estimate is too large.  We may turn off splice
2450  * reads unnecessarily.
2451  */
2452 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
2453                                       struct nfsd4_op *op)
2454 {
2455         u32 *bmap = op->u.getattr.ga_bmval;
2456         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2457         u32 ret = 0;
2458
2459         if (bmap0 & FATTR4_WORD0_ACL)
2460                 return svc_max_payload(rqstp);
2461         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2462                 return svc_max_payload(rqstp);
2463
2464         if (bmap1 & FATTR4_WORD1_OWNER) {
2465                 ret += IDMAP_NAMESZ + 4;
2466                 bmap1 &= ~FATTR4_WORD1_OWNER;
2467         }
2468         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2469                 ret += IDMAP_NAMESZ + 4;
2470                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2471         }
2472         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2473                 ret += NFS4_FHSIZE + 4;
2474                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2475         }
2476         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2477                 ret += NFS4_MAXLABELLEN + 12;
2478                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2479         }
2480         /*
2481          * Largest of remaining attributes are 16 bytes (e.g.,
2482          * supported_attributes)
2483          */
2484         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2485         /* bitmask, length */
2486         ret += 20;
2487         return ret;
2488 }
2489
2490 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2491 {
2492         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2493 }
2494
2495 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2496 {
2497         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2498                 * sizeof(__be32);
2499 }
2500
2501 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2502 {
2503         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2504                 * sizeof(__be32);
2505 }
2506
2507 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2508 {
2509         return (op_encode_hdr_size + op_encode_stateid_maxsz
2510                 + op_encode_change_info_maxsz + 1
2511                 + nfs4_fattr_bitmap_maxsz
2512                 + op_encode_delegation_maxsz) * sizeof(__be32);
2513 }
2514
2515 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2516 {
2517         u32 maxcount = 0, rlen = 0;
2518
2519         maxcount = svc_max_payload(rqstp);
2520         rlen = min(op->u.read.rd_length, maxcount);
2521
2522         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2523 }
2524
2525 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2526 {
2527         u32 maxcount = 0, rlen = 0;
2528
2529         maxcount = svc_max_payload(rqstp);
2530         rlen = min(op->u.readdir.rd_maxcount, maxcount);
2531
2532         return (op_encode_hdr_size + op_encode_verifier_maxsz +
2533                 XDR_QUADLEN(rlen)) * sizeof(__be32);
2534 }
2535
2536 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2537 {
2538         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2539 }
2540
2541 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2542 {
2543         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2544                 * sizeof(__be32);
2545 }
2546
2547 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2548 {
2549         return (op_encode_hdr_size + op_encode_change_info_maxsz
2550                 + op_encode_change_info_maxsz) * sizeof(__be32);
2551 }
2552
2553 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
2554                                        struct nfsd4_op *op)
2555 {
2556         return (op_encode_hdr_size
2557                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
2558 }
2559
2560 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2561 {
2562         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
2563                 * sizeof(__be32);
2564 }
2565
2566 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2567 {
2568         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2569 }
2570
2571 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2572 {
2573         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2574                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2575 }
2576
2577 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2578 {
2579         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2580                                                                 sizeof(__be32);
2581 }
2582
2583 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2584 {
2585         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2586 }
2587
2588 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2589 {
2590         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2591                 1 + 1 + /* eir_flags, spr_how */\
2592                 4 + /* spo_must_enforce & _allow with bitmap */\
2593                 2 + /*eir_server_owner.so_minor_id */\
2594                 /* eir_server_owner.so_major_id<> */\
2595                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2596                 /* eir_server_scope<> */\
2597                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2598                 1 + /* eir_server_impl_id array length */\
2599                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2600 }
2601
2602 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2603 {
2604         return (op_encode_hdr_size + \
2605                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2606                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2607 }
2608
2609 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2610 {
2611         return (op_encode_hdr_size + \
2612                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2613                 2 + /* csr_sequence, csr_flags */\
2614                 op_encode_channel_attrs_maxsz + \
2615                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2616 }
2617
2618 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2619 {
2620         return (op_encode_hdr_size +
2621                 1 /* wr_callback */ +
2622                 op_encode_stateid_maxsz /* wr_callback */ +
2623                 2 /* wr_count */ +
2624                 1 /* wr_committed */ +
2625                 op_encode_verifier_maxsz +
2626                 1 /* cr_consecutive */ +
2627                 1 /* cr_synchronous */) * sizeof(__be32);
2628 }
2629
2630 static inline u32 nfsd4_offload_status_rsize(struct svc_rqst *rqstp,
2631                                              struct nfsd4_op *op)
2632 {
2633         return (op_encode_hdr_size +
2634                 2 /* osr_count */ +
2635                 1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
2636 }
2637
2638 static inline u32 nfsd4_copy_notify_rsize(struct svc_rqst *rqstp,
2639                                         struct nfsd4_op *op)
2640 {
2641         return (op_encode_hdr_size +
2642                 3 /* cnr_lease_time */ +
2643                 1 /* We support one cnr_source_server */ +
2644                 1 /* cnr_stateid seq */ +
2645                 op_encode_stateid_maxsz /* cnr_stateid */ +
2646                 1 /* num cnr_source_server*/ +
2647                 1 /* nl4_type */ +
2648                 1 /* nl4 size */ +
2649                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
2650                 * sizeof(__be32);
2651 }
2652
2653 #ifdef CONFIG_NFSD_PNFS
2654 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2655 {
2656         u32 maxcount = 0, rlen = 0;
2657
2658         maxcount = svc_max_payload(rqstp);
2659         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2660
2661         return (op_encode_hdr_size +
2662                 1 /* gd_layout_type*/ +
2663                 XDR_QUADLEN(rlen) +
2664                 2 /* gd_notify_types */) * sizeof(__be32);
2665 }
2666
2667 /*
2668  * At this stage we don't really know what layout driver will handle the request,
2669  * so we need to define an arbitrary upper bound here.
2670  */
2671 #define MAX_LAYOUT_SIZE         128
2672 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2673 {
2674         return (op_encode_hdr_size +
2675                 1 /* logr_return_on_close */ +
2676                 op_encode_stateid_maxsz +
2677                 1 /* nr of layouts */ +
2678                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2679 }
2680
2681 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2682 {
2683         return (op_encode_hdr_size +
2684                 1 /* locr_newsize */ +
2685                 2 /* ns_size */) * sizeof(__be32);
2686 }
2687
2688 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2689 {
2690         return (op_encode_hdr_size +
2691                 1 /* lrs_stateid */ +
2692                 op_encode_stateid_maxsz) * sizeof(__be32);
2693 }
2694 #endif /* CONFIG_NFSD_PNFS */
2695
2696
2697 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2698 {
2699         return (op_encode_hdr_size + 3) * sizeof(__be32);
2700 }
2701
2702 static const struct nfsd4_operation nfsd4_ops[] = {
2703         [OP_ACCESS] = {
2704                 .op_func = nfsd4_access,
2705                 .op_name = "OP_ACCESS",
2706                 .op_rsize_bop = nfsd4_access_rsize,
2707         },
2708         [OP_CLOSE] = {
2709                 .op_func = nfsd4_close,
2710                 .op_flags = OP_MODIFIES_SOMETHING,
2711                 .op_name = "OP_CLOSE",
2712                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2713                 .op_get_currentstateid = nfsd4_get_closestateid,
2714                 .op_set_currentstateid = nfsd4_set_closestateid,
2715         },
2716         [OP_COMMIT] = {
2717                 .op_func = nfsd4_commit,
2718                 .op_flags = OP_MODIFIES_SOMETHING,
2719                 .op_name = "OP_COMMIT",
2720                 .op_rsize_bop = nfsd4_commit_rsize,
2721         },
2722         [OP_CREATE] = {
2723                 .op_func = nfsd4_create,
2724                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2725                 .op_name = "OP_CREATE",
2726                 .op_rsize_bop = nfsd4_create_rsize,
2727         },
2728         [OP_DELEGRETURN] = {
2729                 .op_func = nfsd4_delegreturn,
2730                 .op_flags = OP_MODIFIES_SOMETHING,
2731                 .op_name = "OP_DELEGRETURN",
2732                 .op_rsize_bop = nfsd4_only_status_rsize,
2733                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2734         },
2735         [OP_GETATTR] = {
2736                 .op_func = nfsd4_getattr,
2737                 .op_flags = ALLOWED_ON_ABSENT_FS,
2738                 .op_rsize_bop = nfsd4_getattr_rsize,
2739                 .op_name = "OP_GETATTR",
2740         },
2741         [OP_GETFH] = {
2742                 .op_func = nfsd4_getfh,
2743                 .op_name = "OP_GETFH",
2744                 .op_rsize_bop = nfsd4_getfh_rsize,
2745         },
2746         [OP_LINK] = {
2747                 .op_func = nfsd4_link,
2748                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2749                                 | OP_CACHEME,
2750                 .op_name = "OP_LINK",
2751                 .op_rsize_bop = nfsd4_link_rsize,
2752         },
2753         [OP_LOCK] = {
2754                 .op_func = nfsd4_lock,
2755                 .op_flags = OP_MODIFIES_SOMETHING |
2756                                 OP_NONTRIVIAL_ERROR_ENCODE,
2757                 .op_name = "OP_LOCK",
2758                 .op_rsize_bop = nfsd4_lock_rsize,
2759                 .op_set_currentstateid = nfsd4_set_lockstateid,
2760         },
2761         [OP_LOCKT] = {
2762                 .op_func = nfsd4_lockt,
2763                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2764                 .op_name = "OP_LOCKT",
2765                 .op_rsize_bop = nfsd4_lock_rsize,
2766         },
2767         [OP_LOCKU] = {
2768                 .op_func = nfsd4_locku,
2769                 .op_flags = OP_MODIFIES_SOMETHING,
2770                 .op_name = "OP_LOCKU",
2771                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2772                 .op_get_currentstateid = nfsd4_get_lockustateid,
2773         },
2774         [OP_LOOKUP] = {
2775                 .op_func = nfsd4_lookup,
2776                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2777                 .op_name = "OP_LOOKUP",
2778                 .op_rsize_bop = nfsd4_only_status_rsize,
2779         },
2780         [OP_LOOKUPP] = {
2781                 .op_func = nfsd4_lookupp,
2782                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2783                 .op_name = "OP_LOOKUPP",
2784                 .op_rsize_bop = nfsd4_only_status_rsize,
2785         },
2786         [OP_NVERIFY] = {
2787                 .op_func = nfsd4_nverify,
2788                 .op_name = "OP_NVERIFY",
2789                 .op_rsize_bop = nfsd4_only_status_rsize,
2790         },
2791         [OP_OPEN] = {
2792                 .op_func = nfsd4_open,
2793                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2794                 .op_name = "OP_OPEN",
2795                 .op_rsize_bop = nfsd4_open_rsize,
2796                 .op_set_currentstateid = nfsd4_set_openstateid,
2797         },
2798         [OP_OPEN_CONFIRM] = {
2799                 .op_func = nfsd4_open_confirm,
2800                 .op_flags = OP_MODIFIES_SOMETHING,
2801                 .op_name = "OP_OPEN_CONFIRM",
2802                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2803         },
2804         [OP_OPEN_DOWNGRADE] = {
2805                 .op_func = nfsd4_open_downgrade,
2806                 .op_flags = OP_MODIFIES_SOMETHING,
2807                 .op_name = "OP_OPEN_DOWNGRADE",
2808                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2809                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2810                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2811         },
2812         [OP_PUTFH] = {
2813                 .op_func = nfsd4_putfh,
2814                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2815                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2816                 .op_name = "OP_PUTFH",
2817                 .op_rsize_bop = nfsd4_only_status_rsize,
2818         },
2819         [OP_PUTPUBFH] = {
2820                 .op_func = nfsd4_putrootfh,
2821                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2822                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2823                 .op_name = "OP_PUTPUBFH",
2824                 .op_rsize_bop = nfsd4_only_status_rsize,
2825         },
2826         [OP_PUTROOTFH] = {
2827                 .op_func = nfsd4_putrootfh,
2828                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2829                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2830                 .op_name = "OP_PUTROOTFH",
2831                 .op_rsize_bop = nfsd4_only_status_rsize,
2832         },
2833         [OP_READ] = {
2834                 .op_func = nfsd4_read,
2835                 .op_release = nfsd4_read_release,
2836                 .op_name = "OP_READ",
2837                 .op_rsize_bop = nfsd4_read_rsize,
2838                 .op_get_currentstateid = nfsd4_get_readstateid,
2839         },
2840         [OP_READDIR] = {
2841                 .op_func = nfsd4_readdir,
2842                 .op_name = "OP_READDIR",
2843                 .op_rsize_bop = nfsd4_readdir_rsize,
2844         },
2845         [OP_READLINK] = {
2846                 .op_func = nfsd4_readlink,
2847                 .op_name = "OP_READLINK",
2848                 .op_rsize_bop = nfsd4_readlink_rsize,
2849         },
2850         [OP_REMOVE] = {
2851                 .op_func = nfsd4_remove,
2852                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2853                 .op_name = "OP_REMOVE",
2854                 .op_rsize_bop = nfsd4_remove_rsize,
2855         },
2856         [OP_RENAME] = {
2857                 .op_func = nfsd4_rename,
2858                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2859                 .op_name = "OP_RENAME",
2860                 .op_rsize_bop = nfsd4_rename_rsize,
2861         },
2862         [OP_RENEW] = {
2863                 .op_func = nfsd4_renew,
2864                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2865                                 | OP_MODIFIES_SOMETHING,
2866                 .op_name = "OP_RENEW",
2867                 .op_rsize_bop = nfsd4_only_status_rsize,
2868
2869         },
2870         [OP_RESTOREFH] = {
2871                 .op_func = nfsd4_restorefh,
2872                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2873                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2874                 .op_name = "OP_RESTOREFH",
2875                 .op_rsize_bop = nfsd4_only_status_rsize,
2876         },
2877         [OP_SAVEFH] = {
2878                 .op_func = nfsd4_savefh,
2879                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2880                 .op_name = "OP_SAVEFH",
2881                 .op_rsize_bop = nfsd4_only_status_rsize,
2882         },
2883         [OP_SECINFO] = {
2884                 .op_func = nfsd4_secinfo,
2885                 .op_release = nfsd4_secinfo_release,
2886                 .op_flags = OP_HANDLES_WRONGSEC,
2887                 .op_name = "OP_SECINFO",
2888                 .op_rsize_bop = nfsd4_secinfo_rsize,
2889         },
2890         [OP_SETATTR] = {
2891                 .op_func = nfsd4_setattr,
2892                 .op_name = "OP_SETATTR",
2893                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2894                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2895                 .op_rsize_bop = nfsd4_setattr_rsize,
2896                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2897         },
2898         [OP_SETCLIENTID] = {
2899                 .op_func = nfsd4_setclientid,
2900                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2901                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2902                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2903                 .op_name = "OP_SETCLIENTID",
2904                 .op_rsize_bop = nfsd4_setclientid_rsize,
2905         },
2906         [OP_SETCLIENTID_CONFIRM] = {
2907                 .op_func = nfsd4_setclientid_confirm,
2908                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2909                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2910                 .op_name = "OP_SETCLIENTID_CONFIRM",
2911                 .op_rsize_bop = nfsd4_only_status_rsize,
2912         },
2913         [OP_VERIFY] = {
2914                 .op_func = nfsd4_verify,
2915                 .op_name = "OP_VERIFY",
2916                 .op_rsize_bop = nfsd4_only_status_rsize,
2917         },
2918         [OP_WRITE] = {
2919                 .op_func = nfsd4_write,
2920                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2921                 .op_name = "OP_WRITE",
2922                 .op_rsize_bop = nfsd4_write_rsize,
2923                 .op_get_currentstateid = nfsd4_get_writestateid,
2924         },
2925         [OP_RELEASE_LOCKOWNER] = {
2926                 .op_func = nfsd4_release_lockowner,
2927                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2928                                 | OP_MODIFIES_SOMETHING,
2929                 .op_name = "OP_RELEASE_LOCKOWNER",
2930                 .op_rsize_bop = nfsd4_only_status_rsize,
2931         },
2932
2933         /* NFSv4.1 operations */
2934         [OP_EXCHANGE_ID] = {
2935                 .op_func = nfsd4_exchange_id,
2936                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2937                                 | OP_MODIFIES_SOMETHING,
2938                 .op_name = "OP_EXCHANGE_ID",
2939                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2940         },
2941         [OP_BACKCHANNEL_CTL] = {
2942                 .op_func = nfsd4_backchannel_ctl,
2943                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2944                 .op_name = "OP_BACKCHANNEL_CTL",
2945                 .op_rsize_bop = nfsd4_only_status_rsize,
2946         },
2947         [OP_BIND_CONN_TO_SESSION] = {
2948                 .op_func = nfsd4_bind_conn_to_session,
2949                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2950                                 | OP_MODIFIES_SOMETHING,
2951                 .op_name = "OP_BIND_CONN_TO_SESSION",
2952                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2953         },
2954         [OP_CREATE_SESSION] = {
2955                 .op_func = nfsd4_create_session,
2956                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2957                                 | OP_MODIFIES_SOMETHING,
2958                 .op_name = "OP_CREATE_SESSION",
2959                 .op_rsize_bop = nfsd4_create_session_rsize,
2960         },
2961         [OP_DESTROY_SESSION] = {
2962                 .op_func = nfsd4_destroy_session,
2963                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2964                                 | OP_MODIFIES_SOMETHING,
2965                 .op_name = "OP_DESTROY_SESSION",
2966                 .op_rsize_bop = nfsd4_only_status_rsize,
2967         },
2968         [OP_SEQUENCE] = {
2969                 .op_func = nfsd4_sequence,
2970                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2971                 .op_name = "OP_SEQUENCE",
2972                 .op_rsize_bop = nfsd4_sequence_rsize,
2973         },
2974         [OP_DESTROY_CLIENTID] = {
2975                 .op_func = nfsd4_destroy_clientid,
2976                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2977                                 | OP_MODIFIES_SOMETHING,
2978                 .op_name = "OP_DESTROY_CLIENTID",
2979                 .op_rsize_bop = nfsd4_only_status_rsize,
2980         },
2981         [OP_RECLAIM_COMPLETE] = {
2982                 .op_func = nfsd4_reclaim_complete,
2983                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2984                 .op_name = "OP_RECLAIM_COMPLETE",
2985                 .op_rsize_bop = nfsd4_only_status_rsize,
2986         },
2987         [OP_SECINFO_NO_NAME] = {
2988                 .op_func = nfsd4_secinfo_no_name,
2989                 .op_release = nfsd4_secinfo_no_name_release,
2990                 .op_flags = OP_HANDLES_WRONGSEC,
2991                 .op_name = "OP_SECINFO_NO_NAME",
2992                 .op_rsize_bop = nfsd4_secinfo_rsize,
2993         },
2994         [OP_TEST_STATEID] = {
2995                 .op_func = nfsd4_test_stateid,
2996                 .op_flags = ALLOWED_WITHOUT_FH,
2997                 .op_name = "OP_TEST_STATEID",
2998                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2999         },
3000         [OP_FREE_STATEID] = {
3001                 .op_func = nfsd4_free_stateid,
3002                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3003                 .op_name = "OP_FREE_STATEID",
3004                 .op_get_currentstateid = nfsd4_get_freestateid,
3005                 .op_rsize_bop = nfsd4_only_status_rsize,
3006         },
3007 #ifdef CONFIG_NFSD_PNFS
3008         [OP_GETDEVICEINFO] = {
3009                 .op_func = nfsd4_getdeviceinfo,
3010                 .op_release = nfsd4_getdeviceinfo_release,
3011                 .op_flags = ALLOWED_WITHOUT_FH,
3012                 .op_name = "OP_GETDEVICEINFO",
3013                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3014         },
3015         [OP_LAYOUTGET] = {
3016                 .op_func = nfsd4_layoutget,
3017                 .op_release = nfsd4_layoutget_release,
3018                 .op_flags = OP_MODIFIES_SOMETHING,
3019                 .op_name = "OP_LAYOUTGET",
3020                 .op_rsize_bop = nfsd4_layoutget_rsize,
3021         },
3022         [OP_LAYOUTCOMMIT] = {
3023                 .op_func = nfsd4_layoutcommit,
3024                 .op_flags = OP_MODIFIES_SOMETHING,
3025                 .op_name = "OP_LAYOUTCOMMIT",
3026                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
3027         },
3028         [OP_LAYOUTRETURN] = {
3029                 .op_func = nfsd4_layoutreturn,
3030                 .op_flags = OP_MODIFIES_SOMETHING,
3031                 .op_name = "OP_LAYOUTRETURN",
3032                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
3033         },
3034 #endif /* CONFIG_NFSD_PNFS */
3035
3036         /* NFSv4.2 operations */
3037         [OP_ALLOCATE] = {
3038                 .op_func = nfsd4_allocate,
3039                 .op_flags = OP_MODIFIES_SOMETHING,
3040                 .op_name = "OP_ALLOCATE",
3041                 .op_rsize_bop = nfsd4_only_status_rsize,
3042         },
3043         [OP_DEALLOCATE] = {
3044                 .op_func = nfsd4_deallocate,
3045                 .op_flags = OP_MODIFIES_SOMETHING,
3046                 .op_name = "OP_DEALLOCATE",
3047                 .op_rsize_bop = nfsd4_only_status_rsize,
3048         },
3049         [OP_CLONE] = {
3050                 .op_func = nfsd4_clone,
3051                 .op_flags = OP_MODIFIES_SOMETHING,
3052                 .op_name = "OP_CLONE",
3053                 .op_rsize_bop = nfsd4_only_status_rsize,
3054         },
3055         [OP_COPY] = {
3056                 .op_func = nfsd4_copy,
3057                 .op_flags = OP_MODIFIES_SOMETHING,
3058                 .op_name = "OP_COPY",
3059                 .op_rsize_bop = nfsd4_copy_rsize,
3060         },
3061         [OP_SEEK] = {
3062                 .op_func = nfsd4_seek,
3063                 .op_name = "OP_SEEK",
3064                 .op_rsize_bop = nfsd4_seek_rsize,
3065         },
3066         [OP_OFFLOAD_STATUS] = {
3067                 .op_func = nfsd4_offload_status,
3068                 .op_name = "OP_OFFLOAD_STATUS",
3069                 .op_rsize_bop = nfsd4_offload_status_rsize,
3070         },
3071         [OP_OFFLOAD_CANCEL] = {
3072                 .op_func = nfsd4_offload_cancel,
3073                 .op_flags = OP_MODIFIES_SOMETHING,
3074                 .op_name = "OP_OFFLOAD_CANCEL",
3075                 .op_rsize_bop = nfsd4_only_status_rsize,
3076         },
3077         [OP_COPY_NOTIFY] = {
3078                 .op_func = nfsd4_copy_notify,
3079                 .op_flags = OP_MODIFIES_SOMETHING,
3080                 .op_name = "OP_COPY_NOTIFY",
3081                 .op_rsize_bop = nfsd4_copy_notify_rsize,
3082         },
3083 };
3084
3085 /**
3086  * nfsd4_spo_must_allow - Determine if the compound op contains an
3087  * operation that is allowed to be sent with machine credentials
3088  *
3089  * @rqstp: a pointer to the struct svc_rqst
3090  *
3091  * Checks to see if the compound contains a spo_must_allow op
3092  * and confirms that it was sent with the proper machine creds.
3093  */
3094
3095 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3096 {
3097         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3098         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3099         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
3100         struct nfsd4_compound_state *cstate = &resp->cstate;
3101         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3102         u32 opiter;
3103
3104         if (!cstate->minorversion)
3105                 return false;
3106
3107         if (cstate->spo_must_allowed == true)
3108                 return true;
3109
3110         opiter = resp->opcnt;
3111         while (opiter < argp->opcnt) {
3112                 this = &argp->ops[opiter++];
3113                 if (test_bit(this->opnum, allow->u.longs) &&
3114                         cstate->clp->cl_mach_cred &&
3115                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3116                         cstate->spo_must_allowed = true;
3117                         return true;
3118                 }
3119         }
3120         cstate->spo_must_allowed = false;
3121         return false;
3122 }
3123
3124 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3125 {
3126         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3127                 return op_encode_hdr_size * sizeof(__be32);
3128
3129         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3130         return OPDESC(op)->op_rsize_bop(rqstp, op);
3131 }
3132
3133 void warn_on_nonidempotent_op(struct nfsd4_op *op)
3134 {
3135         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3136                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
3137                         op->opnum, nfsd4_op_name(op->opnum));
3138                 WARN_ON_ONCE(1);
3139         }
3140 }
3141
3142 static const char *nfsd4_op_name(unsigned opnum)
3143 {
3144         if (opnum < ARRAY_SIZE(nfsd4_ops))
3145                 return nfsd4_ops[opnum].op_name;
3146         return "unknown_operation";
3147 }
3148
3149 #define nfsd4_voidres                   nfsd4_voidargs
3150 struct nfsd4_voidargs { int dummy; };
3151
3152 static const struct svc_procedure nfsd_procedures4[2] = {
3153         [NFSPROC4_NULL] = {
3154                 .pc_func = nfsd4_proc_null,
3155                 .pc_encode = nfs4svc_encode_voidres,
3156                 .pc_argsize = sizeof(struct nfsd4_voidargs),
3157                 .pc_ressize = sizeof(struct nfsd4_voidres),
3158                 .pc_cachetype = RC_NOCACHE,
3159                 .pc_xdrressize = 1,
3160         },
3161         [NFSPROC4_COMPOUND] = {
3162                 .pc_func = nfsd4_proc_compound,
3163                 .pc_decode = nfs4svc_decode_compoundargs,
3164                 .pc_encode = nfs4svc_encode_compoundres,
3165                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
3166                 .pc_ressize = sizeof(struct nfsd4_compoundres),
3167                 .pc_release = nfsd4_release_compoundargs,
3168                 .pc_cachetype = RC_NOCACHE,
3169                 .pc_xdrressize = NFSD_BUFSIZE/4,
3170         },
3171 };
3172
3173 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
3174 const struct svc_version nfsd_version4 = {
3175         .vs_vers                = 4,
3176         .vs_nproc               = 2,
3177         .vs_proc                = nfsd_procedures4,
3178         .vs_count               = nfsd_count3,
3179         .vs_dispatch            = nfsd_dispatch,
3180         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
3181         .vs_rpcb_optnl          = true,
3182         .vs_need_cong_ctrl      = true,
3183 };
3184
3185 /*
3186  * Local variables:
3187  *  c-basic-offset: 8
3188  * End:
3189  */