fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/fs_struct.h>
  36 #include <linux/file.h>
  37 #include <linux/falloc.h>
  38 #include <linux/slab.h>
  39 #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  * Verify COPY destination stateid.
1250  *
1251  * Connect to the source server with NFSv4.1.
1252  * Create the source struct file for nfsd_copy_range.
1253  * Called with COPY cstate:
1254  *    SAVED_FH: source filehandle
1255  *    CURRENT_FH: destination filehandle
1256  */
1257 static __be32
1258 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1259                       struct nfsd4_compound_state *cstate,
1260                       struct nfsd4_copy *copy, struct vfsmount **mount)
1261 {
1262         struct svc_fh *s_fh = NULL;
1263         stateid_t *s_stid = &copy->cp_src_stateid;
1264         __be32 status = nfserr_inval;
1265
1266         /* Verify the destination stateid and set dst struct file*/
1267         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1268                                             &copy->cp_dst_stateid,
1269                                             WR_STATE, &copy->nf_dst, NULL);
1270         if (status)
1271                 goto out;
1272
1273         status = nfsd4_interssc_connect(&copy->cp_src, rqstp, mount);
1274         if (status)
1275                 goto out;
1276
1277         s_fh = &cstate->save_fh;
1278
1279         copy->c_fh.size = s_fh->fh_handle.fh_size;
1280         memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_base, copy->c_fh.size);
1281         copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1282         memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1283                sizeof(stateid_opaque_t));
1284
1285         status = 0;
1286 out:
1287         return status;
1288 }
1289
1290 static void
1291 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src,
1292                         struct nfsd_file *dst)
1293 {
1294         nfs42_ssc_close(src->nf_file);
1295         nfsd_file_put(src);
1296         nfsd_file_put(dst);
1297         mntput(ss_mnt);
1298 }
1299
1300 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
1301
1302 static __be32
1303 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1304                       struct nfsd4_compound_state *cstate,
1305                       struct nfsd4_copy *copy,
1306                       struct vfsmount **mount)
1307 {
1308         *mount = NULL;
1309         return nfserr_inval;
1310 }
1311
1312 static void
1313 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src,
1314                         struct nfsd_file *dst)
1315 {
1316 }
1317
1318 static void
1319 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1320 {
1321 }
1322
1323 static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1324                                    struct nfs_fh *src_fh,
1325                                    nfs4_stateid *stateid)
1326 {
1327         return NULL;
1328 }
1329 #endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1330
1331 static __be32
1332 nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1333                       struct nfsd4_compound_state *cstate,
1334                       struct nfsd4_copy *copy)
1335 {
1336         return nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
1337                                  &copy->nf_src, &copy->cp_dst_stateid,
1338                                  &copy->nf_dst);
1339 }
1340
1341 static void
1342 nfsd4_cleanup_intra_ssc(struct nfsd_file *src, struct nfsd_file *dst)
1343 {
1344         nfsd_file_put(src);
1345         nfsd_file_put(dst);
1346 }
1347
1348 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1349 {
1350         struct nfsd4_copy *copy = container_of(cb, struct nfsd4_copy, cp_cb);
1351
1352         nfs4_put_copy(copy);
1353 }
1354
1355 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1356                                  struct rpc_task *task)
1357 {
1358         return 1;
1359 }
1360
1361 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1362         .release = nfsd4_cb_offload_release,
1363         .done = nfsd4_cb_offload_done
1364 };
1365
1366 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1367 {
1368         copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1369         copy->cp_synchronous = sync;
1370         gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
1371 }
1372
1373 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy)
1374 {
1375         ssize_t bytes_copied = 0;
1376         size_t bytes_total = copy->cp_count;
1377         u64 src_pos = copy->cp_src_pos;
1378         u64 dst_pos = copy->cp_dst_pos;
1379
1380         do {
1381                 if (kthread_should_stop())
1382                         break;
1383                 bytes_copied = nfsd_copy_file_range(copy->nf_src->nf_file,
1384                                 src_pos, copy->nf_dst->nf_file, dst_pos,
1385                                 bytes_total);
1386                 if (bytes_copied <= 0)
1387                         break;
1388                 bytes_total -= bytes_copied;
1389                 copy->cp_res.wr_bytes_written += bytes_copied;
1390                 src_pos += bytes_copied;
1391                 dst_pos += bytes_copied;
1392         } while (bytes_total > 0 && !copy->cp_synchronous);
1393         return bytes_copied;
1394 }
1395
1396 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy, bool sync)
1397 {
1398         __be32 status;
1399         ssize_t bytes;
1400
1401         bytes = _nfsd_copy_file_range(copy);
1402         /* for async copy, we ignore the error, client can always retry
1403          * to get the error
1404          */
1405         if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1406                 status = nfserrno(bytes);
1407         else {
1408                 nfsd4_init_copy_res(copy, sync);
1409                 status = nfs_ok;
1410         }
1411
1412         if (!copy->cp_intra) /* Inter server SSC */
1413                 nfsd4_cleanup_inter_ssc(copy->ss_mnt, copy->nf_src,
1414                                         copy->nf_dst);
1415         else
1416                 nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
1417
1418         return status;
1419 }
1420
1421 static int dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1422 {
1423         dst->cp_src_pos = src->cp_src_pos;
1424         dst->cp_dst_pos = src->cp_dst_pos;
1425         dst->cp_count = src->cp_count;
1426         dst->cp_synchronous = src->cp_synchronous;
1427         memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1428         memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1429         dst->cp_clp = src->cp_clp;
1430         dst->nf_dst = nfsd_file_get(src->nf_dst);
1431         dst->cp_intra = src->cp_intra;
1432         if (src->cp_intra) /* for inter, file_src doesn't exist yet */
1433                 dst->nf_src = nfsd_file_get(src->nf_src);
1434
1435         memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1436         memcpy(&dst->cp_src, &src->cp_src, sizeof(struct nl4_server));
1437         memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1438         memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1439         dst->ss_mnt = src->ss_mnt;
1440
1441         return 0;
1442 }
1443
1444 static void cleanup_async_copy(struct nfsd4_copy *copy)
1445 {
1446         nfs4_free_copy_state(copy);
1447         nfsd_file_put(copy->nf_dst);
1448         if (copy->cp_intra)
1449                 nfsd_file_put(copy->nf_src);
1450         spin_lock(&copy->cp_clp->async_lock);
1451         list_del(&copy->copies);
1452         spin_unlock(&copy->cp_clp->async_lock);
1453         nfs4_put_copy(copy);
1454 }
1455
1456 static int nfsd4_do_async_copy(void *data)
1457 {
1458         struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1459         struct nfsd4_copy *cb_copy;
1460
1461         if (!copy->cp_intra) { /* Inter server SSC */
1462                 copy->nf_src = kzalloc(sizeof(struct nfsd_file), GFP_KERNEL);
1463                 if (!copy->nf_src) {
1464                         copy->nfserr = nfserr_serverfault;
1465                         nfsd4_interssc_disconnect(copy->ss_mnt);
1466                         goto do_callback;
1467                 }
1468                 copy->nf_src->nf_file = nfs42_ssc_open(copy->ss_mnt, &copy->c_fh,
1469                                               &copy->stateid);
1470                 if (IS_ERR(copy->nf_src->nf_file)) {
1471                         copy->nfserr = nfserr_offload_denied;
1472                         nfsd4_interssc_disconnect(copy->ss_mnt);
1473                         goto do_callback;
1474                 }
1475         }
1476
1477         copy->nfserr = nfsd4_do_copy(copy, 0);
1478 do_callback:
1479         cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1480         if (!cb_copy)
1481                 goto out;
1482         memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
1483         cb_copy->cp_clp = copy->cp_clp;
1484         cb_copy->nfserr = copy->nfserr;
1485         memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
1486         nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
1487                         &nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
1488         nfsd4_run_cb(&cb_copy->cp_cb);
1489 out:
1490         if (!copy->cp_intra)
1491                 kfree(copy->nf_src);
1492         cleanup_async_copy(copy);
1493         return 0;
1494 }
1495
1496 static __be32
1497 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1498                 union nfsd4_op_u *u)
1499 {
1500         struct nfsd4_copy *copy = &u->copy;
1501         __be32 status;
1502         struct nfsd4_copy *async_copy = NULL;
1503
1504         if (!copy->cp_intra) { /* Inter server SSC */
1505                 if (!inter_copy_offload_enable || copy->cp_synchronous) {
1506                         status = nfserr_notsupp;
1507                         goto out;
1508                 }
1509                 status = nfsd4_setup_inter_ssc(rqstp, cstate, copy,
1510                                 &copy->ss_mnt);
1511                 if (status)
1512                         return nfserr_offload_denied;
1513         } else {
1514                 status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1515                 if (status)
1516                         return status;
1517         }
1518
1519         copy->cp_clp = cstate->clp;
1520         memcpy(&copy->fh, &cstate->current_fh.fh_handle,
1521                 sizeof(struct knfsd_fh));
1522         if (!copy->cp_synchronous) {
1523                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1524
1525                 status = nfserrno(-ENOMEM);
1526                 async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1527                 if (!async_copy)
1528                         goto out_err;
1529                 if (!nfs4_init_copy_state(nn, copy))
1530                         goto out_err;
1531                 refcount_set(&async_copy->refcount, 1);
1532                 memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid,
1533                         sizeof(copy->cp_stateid));
1534                 status = dup_copy_fields(copy, async_copy);
1535                 if (status)
1536                         goto out_err;
1537                 async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1538                                 async_copy, "%s", "copy thread");
1539                 if (IS_ERR(async_copy->copy_task))
1540                         goto out_err;
1541                 spin_lock(&async_copy->cp_clp->async_lock);
1542                 list_add(&async_copy->copies,
1543                                 &async_copy->cp_clp->async_copies);
1544                 spin_unlock(&async_copy->cp_clp->async_lock);
1545                 wake_up_process(async_copy->copy_task);
1546                 status = nfs_ok;
1547         } else {
1548                 status = nfsd4_do_copy(copy, 1);
1549         }
1550 out:
1551         return status;
1552 out_err:
1553         if (async_copy)
1554                 cleanup_async_copy(async_copy);
1555         status = nfserrno(-ENOMEM);
1556         if (!copy->cp_intra)
1557                 nfsd4_interssc_disconnect(copy->ss_mnt);
1558         goto out;
1559 }
1560
1561 struct nfsd4_copy *
1562 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1563 {
1564         struct nfsd4_copy *copy;
1565
1566         spin_lock(&clp->async_lock);
1567         list_for_each_entry(copy, &clp->async_copies, copies) {
1568                 if (memcmp(&copy->cp_stateid.stid, stateid, NFS4_STATEID_SIZE))
1569                         continue;
1570                 refcount_inc(&copy->refcount);
1571                 spin_unlock(&clp->async_lock);
1572                 return copy;
1573         }
1574         spin_unlock(&clp->async_lock);
1575         return NULL;
1576 }
1577
1578 static __be32
1579 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1580                      struct nfsd4_compound_state *cstate,
1581                      union nfsd4_op_u *u)
1582 {
1583         struct nfsd4_offload_status *os = &u->offload_status;
1584         struct nfsd4_copy *copy;
1585         struct nfs4_client *clp = cstate->clp;
1586
1587         copy = find_async_copy(clp, &os->stateid);
1588         if (!copy) {
1589                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1590
1591                 return manage_cpntf_state(nn, &os->stateid, clp, NULL);
1592         } else
1593                 nfsd4_stop_copy(copy);
1594
1595         return nfs_ok;
1596 }
1597
1598 static __be32
1599 nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1600                   union nfsd4_op_u *u)
1601 {
1602         struct nfsd4_copy_notify *cn = &u->copy_notify;
1603         __be32 status;
1604         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1605         struct nfs4_stid *stid;
1606         struct nfs4_cpntf_state *cps;
1607         struct nfs4_client *clp = cstate->clp;
1608
1609         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1610                                         &cn->cpn_src_stateid, RD_STATE, NULL,
1611                                         &stid);
1612         if (status)
1613                 return status;
1614
1615         cn->cpn_sec = nn->nfsd4_lease;
1616         cn->cpn_nsec = 0;
1617
1618         status = nfserrno(-ENOMEM);
1619         cps = nfs4_alloc_init_cpntf_state(nn, stid);
1620         if (!cps)
1621                 goto out;
1622         memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.stid, sizeof(stateid_t));
1623         memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
1624         memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
1625
1626         /* For now, only return one server address in cpn_src, the
1627          * address used by the client to connect to this server.
1628          */
1629         cn->cpn_src.nl4_type = NL4_NETADDR;
1630         status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
1631                                  &cn->cpn_src.u.nl4_addr);
1632         WARN_ON_ONCE(status);
1633         if (status) {
1634                 nfs4_put_cpntf_state(nn, cps);
1635                 goto out;
1636         }
1637 out:
1638         nfs4_put_stid(stid);
1639         return status;
1640 }
1641
1642 static __be32
1643 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1644                 struct nfsd4_fallocate *fallocate, int flags)
1645 {
1646         __be32 status;
1647         struct nfsd_file *nf;
1648
1649         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1650                                             &fallocate->falloc_stateid,
1651                                             WR_STATE, &nf, NULL);
1652         if (status != nfs_ok) {
1653                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1654                 return status;
1655         }
1656
1657         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
1658                                      fallocate->falloc_offset,
1659                                      fallocate->falloc_length,
1660                                      flags);
1661         nfsd_file_put(nf);
1662         return status;
1663 }
1664 static __be32
1665 nfsd4_offload_status(struct svc_rqst *rqstp,
1666                      struct nfsd4_compound_state *cstate,
1667                      union nfsd4_op_u *u)
1668 {
1669         struct nfsd4_offload_status *os = &u->offload_status;
1670         __be32 status = 0;
1671         struct nfsd4_copy *copy;
1672         struct nfs4_client *clp = cstate->clp;
1673
1674         copy = find_async_copy(clp, &os->stateid);
1675         if (copy) {
1676                 os->count = copy->cp_res.wr_bytes_written;
1677                 nfs4_put_copy(copy);
1678         } else
1679                 status = nfserr_bad_stateid;
1680
1681         return status;
1682 }
1683
1684 static __be32
1685 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1686                union nfsd4_op_u *u)
1687 {
1688         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1689 }
1690
1691 static __be32
1692 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1693                  union nfsd4_op_u *u)
1694 {
1695         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1696                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1697 }
1698
1699 static __be32
1700 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1701            union nfsd4_op_u *u)
1702 {
1703         struct nfsd4_seek *seek = &u->seek;
1704         int whence;
1705         __be32 status;
1706         struct nfsd_file *nf;
1707
1708         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1709                                             &seek->seek_stateid,
1710                                             RD_STATE, &nf, NULL);
1711         if (status) {
1712                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1713                 return status;
1714         }
1715
1716         switch (seek->seek_whence) {
1717         case NFS4_CONTENT_DATA:
1718                 whence = SEEK_DATA;
1719                 break;
1720         case NFS4_CONTENT_HOLE:
1721                 whence = SEEK_HOLE;
1722                 break;
1723         default:
1724                 status = nfserr_union_notsupp;
1725                 goto out;
1726         }
1727
1728         /*
1729          * Note:  This call does change file->f_pos, but nothing in NFSD
1730          *        should ever file->f_pos.
1731          */
1732         seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
1733         if (seek->seek_pos < 0)
1734                 status = nfserrno(seek->seek_pos);
1735         else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
1736                 seek->seek_eof = true;
1737
1738 out:
1739         nfsd_file_put(nf);
1740         return status;
1741 }
1742
1743 /* This routine never returns NFS_OK!  If there are no other errors, it
1744  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1745  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1746  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1747  */
1748 static __be32
1749 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1750              struct nfsd4_verify *verify)
1751 {
1752         __be32 *buf, *p;
1753         int count;
1754         __be32 status;
1755
1756         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1757         if (status)
1758                 return status;
1759
1760         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1761         if (status)
1762                 return status;
1763
1764         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1765             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1766                 return nfserr_inval;
1767         if (verify->ve_attrlen & 3)
1768                 return nfserr_inval;
1769
1770         /* count in words:
1771          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1772          */
1773         count = 4 + (verify->ve_attrlen >> 2);
1774         buf = kmalloc(count << 2, GFP_KERNEL);
1775         if (!buf)
1776                 return nfserr_jukebox;
1777
1778         p = buf;
1779         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1780                                     cstate->current_fh.fh_export,
1781                                     cstate->current_fh.fh_dentry,
1782                                     verify->ve_bmval,
1783                                     rqstp, 0);
1784         /*
1785          * If nfsd4_encode_fattr() ran out of space, assume that's because
1786          * the attributes are longer (hence different) than those given:
1787          */
1788         if (status == nfserr_resource)
1789                 status = nfserr_not_same;
1790         if (status)
1791                 goto out_kfree;
1792
1793         /* skip bitmap */
1794         p = buf + 1 + ntohl(buf[0]);
1795         status = nfserr_not_same;
1796         if (ntohl(*p++) != verify->ve_attrlen)
1797                 goto out_kfree;
1798         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1799                 status = nfserr_same;
1800
1801 out_kfree:
1802         kfree(buf);
1803         return status;
1804 }
1805
1806 static __be32
1807 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1808               union nfsd4_op_u *u)
1809 {
1810         __be32 status;
1811
1812         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1813         return status == nfserr_not_same ? nfs_ok : status;
1814 }
1815
1816 static __be32
1817 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1818              union nfsd4_op_u *u)
1819 {
1820         __be32 status;
1821
1822         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1823         return status == nfserr_same ? nfs_ok : status;
1824 }
1825
1826 #ifdef CONFIG_NFSD_PNFS
1827 static const struct nfsd4_layout_ops *
1828 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1829 {
1830         if (!exp->ex_layout_types) {
1831                 dprintk("%s: export does not support pNFS\n", __func__);
1832                 return NULL;
1833         }
1834
1835         if (layout_type >= LAYOUT_TYPE_MAX ||
1836             !(exp->ex_layout_types & (1 << layout_type))) {
1837                 dprintk("%s: layout type %d not supported\n",
1838                         __func__, layout_type);
1839                 return NULL;
1840         }
1841
1842         return nfsd4_layout_ops[layout_type];
1843 }
1844
1845 static __be32
1846 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1847                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1848 {
1849         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1850         const struct nfsd4_layout_ops *ops;
1851         struct nfsd4_deviceid_map *map;
1852         struct svc_export *exp;
1853         __be32 nfserr;
1854
1855         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1856                __func__,
1857                gdp->gd_layout_type,
1858                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1859                gdp->gd_maxcount);
1860
1861         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1862         if (!map) {
1863                 dprintk("%s: couldn't find device ID to export mapping!\n",
1864                         __func__);
1865                 return nfserr_noent;
1866         }
1867
1868         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1869         if (IS_ERR(exp)) {
1870                 dprintk("%s: could not find device id\n", __func__);
1871                 return nfserr_noent;
1872         }
1873
1874         nfserr = nfserr_layoutunavailable;
1875         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1876         if (!ops)
1877                 goto out;
1878
1879         nfserr = nfs_ok;
1880         if (gdp->gd_maxcount != 0) {
1881                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1882                                 rqstp, cstate->session->se_client, gdp);
1883         }
1884
1885         gdp->gd_notify_types &= ops->notify_types;
1886 out:
1887         exp_put(exp);
1888         return nfserr;
1889 }
1890
1891 static void
1892 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1893 {
1894         kfree(u->getdeviceinfo.gd_device);
1895 }
1896
1897 static __be32
1898 nfsd4_layoutget(struct svc_rqst *rqstp,
1899                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1900 {
1901         struct nfsd4_layoutget *lgp = &u->layoutget;
1902         struct svc_fh *current_fh = &cstate->current_fh;
1903         const struct nfsd4_layout_ops *ops;
1904         struct nfs4_layout_stateid *ls;
1905         __be32 nfserr;
1906         int accmode = NFSD_MAY_READ_IF_EXEC;
1907
1908         switch (lgp->lg_seg.iomode) {
1909         case IOMODE_READ:
1910                 accmode |= NFSD_MAY_READ;
1911                 break;
1912         case IOMODE_RW:
1913                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
1914                 break;
1915         default:
1916                 dprintk("%s: invalid iomode %d\n",
1917                         __func__, lgp->lg_seg.iomode);
1918                 nfserr = nfserr_badiomode;
1919                 goto out;
1920         }
1921
1922         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1923         if (nfserr)
1924                 goto out;
1925
1926         nfserr = nfserr_layoutunavailable;
1927         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1928         if (!ops)
1929                 goto out;
1930
1931         /*
1932          * Verify minlength and range as per RFC5661:
1933          *  o  If loga_length is less than loga_minlength,
1934          *     the metadata server MUST return NFS4ERR_INVAL.
1935          *  o  If the sum of loga_offset and loga_minlength exceeds
1936          *     NFS4_UINT64_MAX, and loga_minlength is not
1937          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1938          *  o  If the sum of loga_offset and loga_length exceeds
1939          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1940          *     the error NFS4ERR_INVAL MUST result.
1941          */
1942         nfserr = nfserr_inval;
1943         if (lgp->lg_seg.length < lgp->lg_minlength ||
1944             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1945              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1946             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1947              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1948                 goto out;
1949         if (lgp->lg_seg.length == 0)
1950                 goto out;
1951
1952         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1953                                                 true, lgp->lg_layout_type, &ls);
1954         if (nfserr) {
1955                 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
1956                 goto out;
1957         }
1958
1959         nfserr = nfserr_recallconflict;
1960         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1961                 goto out_put_stid;
1962
1963         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1964                                      current_fh, lgp);
1965         if (nfserr)
1966                 goto out_put_stid;
1967
1968         nfserr = nfsd4_insert_layout(lgp, ls);
1969
1970 out_put_stid:
1971         mutex_unlock(&ls->ls_mutex);
1972         nfs4_put_stid(&ls->ls_stid);
1973 out:
1974         return nfserr;
1975 }
1976
1977 static void
1978 nfsd4_layoutget_release(union nfsd4_op_u *u)
1979 {
1980         kfree(u->layoutget.lg_content);
1981 }
1982
1983 static __be32
1984 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1985                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1986 {
1987         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1988         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1989         struct svc_fh *current_fh = &cstate->current_fh;
1990         const struct nfsd4_layout_ops *ops;
1991         loff_t new_size = lcp->lc_last_wr + 1;
1992         struct inode *inode;
1993         struct nfs4_layout_stateid *ls;
1994         __be32 nfserr;
1995
1996         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1997         if (nfserr)
1998                 goto out;
1999
2000         nfserr = nfserr_layoutunavailable;
2001         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2002         if (!ops)
2003                 goto out;
2004         inode = d_inode(current_fh->fh_dentry);
2005
2006         nfserr = nfserr_inval;
2007         if (new_size <= seg->offset) {
2008                 dprintk("pnfsd: last write before layout segment\n");
2009                 goto out;
2010         }
2011         if (new_size > seg->offset + seg->length) {
2012                 dprintk("pnfsd: last write beyond layout segment\n");
2013                 goto out;
2014         }
2015         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2016                 dprintk("pnfsd: layoutcommit beyond EOF\n");
2017                 goto out;
2018         }
2019
2020         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2021                                                 false, lcp->lc_layout_type,
2022                                                 &ls);
2023         if (nfserr) {
2024                 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2025                 /* fixup error code as per RFC5661 */
2026                 if (nfserr == nfserr_bad_stateid)
2027                         nfserr = nfserr_badlayout;
2028                 goto out;
2029         }
2030
2031         /* LAYOUTCOMMIT does not require any serialization */
2032         mutex_unlock(&ls->ls_mutex);
2033
2034         if (new_size > i_size_read(inode)) {
2035                 lcp->lc_size_chg = 1;
2036                 lcp->lc_newsize = new_size;
2037         } else {
2038                 lcp->lc_size_chg = 0;
2039         }
2040
2041         nfserr = ops->proc_layoutcommit(inode, lcp);
2042         nfs4_put_stid(&ls->ls_stid);
2043 out:
2044         return nfserr;
2045 }
2046
2047 static __be32
2048 nfsd4_layoutreturn(struct svc_rqst *rqstp,
2049                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2050 {
2051         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2052         struct svc_fh *current_fh = &cstate->current_fh;
2053         __be32 nfserr;
2054
2055         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2056         if (nfserr)
2057                 goto out;
2058
2059         nfserr = nfserr_layoutunavailable;
2060         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2061                 goto out;
2062
2063         switch (lrp->lr_seg.iomode) {
2064         case IOMODE_READ:
2065         case IOMODE_RW:
2066         case IOMODE_ANY:
2067                 break;
2068         default:
2069                 dprintk("%s: invalid iomode %d\n", __func__,
2070                         lrp->lr_seg.iomode);
2071                 nfserr = nfserr_inval;
2072                 goto out;
2073         }
2074
2075         switch (lrp->lr_return_type) {
2076         case RETURN_FILE:
2077                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2078                 break;
2079         case RETURN_FSID:
2080         case RETURN_ALL:
2081                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2082                 break;
2083         default:
2084                 dprintk("%s: invalid return_type %d\n", __func__,
2085                         lrp->lr_return_type);
2086                 nfserr = nfserr_inval;
2087                 break;
2088         }
2089 out:
2090         return nfserr;
2091 }
2092 #endif /* CONFIG_NFSD_PNFS */
2093
2094 /*
2095  * NULL call.
2096  */
2097 static __be32
2098 nfsd4_proc_null(struct svc_rqst *rqstp)
2099 {
2100         return nfs_ok;
2101 }
2102
2103 static inline void nfsd4_increment_op_stats(u32 opnum)
2104 {
2105         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2106                 nfsdstats.nfs4_opcount[opnum]++;
2107 }
2108
2109 static const struct nfsd4_operation nfsd4_ops[];
2110
2111 static const char *nfsd4_op_name(unsigned opnum);
2112
2113 /*
2114  * Enforce NFSv4.1 COMPOUND ordering rules:
2115  *
2116  * Also note, enforced elsewhere:
2117  *      - SEQUENCE other than as first op results in
2118  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2119  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
2120  *        (Enforced in nfsd4_bind_conn_to_session().)
2121  *      - DESTROY_SESSION must be the final operation in a compound, if
2122  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2123  *        (Enforced in nfsd4_destroy_session().)
2124  */
2125 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2126 {
2127         struct nfsd4_op *first_op = &args->ops[0];
2128
2129         /* These ordering requirements don't apply to NFSv4.0: */
2130         if (args->minorversion == 0)
2131                 return nfs_ok;
2132         /* This is weird, but OK, not our problem: */
2133         if (args->opcnt == 0)
2134                 return nfs_ok;
2135         if (first_op->status == nfserr_op_illegal)
2136                 return nfs_ok;
2137         if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2138                 return nfserr_op_not_in_session;
2139         if (first_op->opnum == OP_SEQUENCE)
2140                 return nfs_ok;
2141         /*
2142          * So first_op is something allowed outside a session, like
2143          * EXCHANGE_ID; but then it has to be the only op in the
2144          * compound:
2145          */
2146         if (args->opcnt != 1)
2147                 return nfserr_not_only_op;
2148         return nfs_ok;
2149 }
2150
2151 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2152 {
2153         return &nfsd4_ops[op->opnum];
2154 }
2155
2156 bool nfsd4_cache_this_op(struct nfsd4_op *op)
2157 {
2158         if (op->opnum == OP_ILLEGAL)
2159                 return false;
2160         return OPDESC(op)->op_flags & OP_CACHEME;
2161 }
2162
2163 static bool need_wrongsec_check(struct svc_rqst *rqstp)
2164 {
2165         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2166         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2167         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2168         struct nfsd4_op *next = &argp->ops[resp->opcnt];
2169         const struct nfsd4_operation *thisd = OPDESC(this);
2170         const struct nfsd4_operation *nextd;
2171
2172         /*
2173          * Most ops check wronsec on our own; only the putfh-like ops
2174          * have special rules.
2175          */
2176         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2177                 return false;
2178         /*
2179          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2180          * put-filehandle operation if we're not going to use the
2181          * result:
2182          */
2183         if (argp->opcnt == resp->opcnt)
2184                 return false;
2185         if (next->opnum == OP_ILLEGAL)
2186                 return false;
2187         nextd = OPDESC(next);
2188         /*
2189          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2190          * errors themselves as necessary; others should check for them
2191          * now:
2192          */
2193         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2194 }
2195
2196 static void svcxdr_init_encode(struct svc_rqst *rqstp,
2197                                struct nfsd4_compoundres *resp)
2198 {
2199         struct xdr_stream *xdr = &resp->xdr;
2200         struct xdr_buf *buf = &rqstp->rq_res;
2201         struct kvec *head = buf->head;
2202
2203         xdr->buf = buf;
2204         xdr->iov = head;
2205         xdr->p   = head->iov_base + head->iov_len;
2206         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
2207         /* Tail and page_len should be zero at this point: */
2208         buf->len = buf->head[0].iov_len;
2209         xdr->scratch.iov_len = 0;
2210         xdr->page_ptr = buf->pages - 1;
2211         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
2212                 - rqstp->rq_auth_slack;
2213 }
2214
2215 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
2216 static void
2217 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2218 {
2219         struct nfsd4_op *op, *current_op = NULL, *saved_op = NULL;
2220         struct nfsd4_copy *copy;
2221         struct nfsd4_putfh *putfh;
2222         int i;
2223
2224         /* traverse all operation and if it's a COPY compound, mark the
2225          * source filehandle to skip verification
2226          */
2227         for (i = 0; i < args->opcnt; i++) {
2228                 op = &args->ops[i];
2229                 if (op->opnum == OP_PUTFH)
2230                         current_op = op;
2231                 else if (op->opnum == OP_SAVEFH)
2232                         saved_op = current_op;
2233                 else if (op->opnum == OP_RESTOREFH)
2234                         current_op = saved_op;
2235                 else if (op->opnum == OP_COPY) {
2236                         copy = (struct nfsd4_copy *)&op->u;
2237                         if (!saved_op) {
2238                                 op->status = nfserr_nofilehandle;
2239                                 return;
2240                         }
2241                         putfh = (struct nfsd4_putfh *)&saved_op->u;
2242                         if (!copy->cp_intra)
2243                                 putfh->no_verify = true;
2244                 }
2245         }
2246 }
2247 #else
2248 static void
2249 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2250 {
2251 }
2252 #endif
2253
2254 /*
2255  * COMPOUND call.
2256  */
2257 static __be32
2258 nfsd4_proc_compound(struct svc_rqst *rqstp)
2259 {
2260         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2261         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2262         struct nfsd4_op *op;
2263         struct nfsd4_compound_state *cstate = &resp->cstate;
2264         struct svc_fh *current_fh = &cstate->current_fh;
2265         struct svc_fh *save_fh = &cstate->save_fh;
2266         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2267         __be32          status;
2268
2269         svcxdr_init_encode(rqstp, resp);
2270         resp->tagp = resp->xdr.p;
2271         /* reserve space for: taglen, tag, and opcnt */
2272         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
2273         resp->taglen = args->taglen;
2274         resp->tag = args->tag;
2275         resp->rqstp = rqstp;
2276         cstate->minorversion = args->minorversion;
2277         fh_init(current_fh, NFS4_FHSIZE);
2278         fh_init(save_fh, NFS4_FHSIZE);
2279         /*
2280          * Don't use the deferral mechanism for NFSv4; compounds make it
2281          * too hard to avoid non-idempotency problems.
2282          */
2283         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2284
2285         /*
2286          * According to RFC3010, this takes precedence over all other errors.
2287          */
2288         status = nfserr_minor_vers_mismatch;
2289         if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2290                 goto out;
2291         status = nfserr_resource;
2292         if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2293                 goto out;
2294
2295         status = nfs41_check_op_ordering(args);
2296         if (status) {
2297                 op = &args->ops[0];
2298                 op->status = status;
2299                 resp->opcnt = 1;
2300                 goto encode_op;
2301         }
2302         check_if_stalefh_allowed(args);
2303
2304         rqstp->rq_lease_breaker = (void **)&cstate->clp;
2305
2306         trace_nfsd_compound(rqstp, args->opcnt);
2307         while (!status && resp->opcnt < args->opcnt) {
2308                 op = &args->ops[resp->opcnt++];
2309
2310                 /*
2311                  * The XDR decode routines may have pre-set op->status;
2312                  * for example, if there is a miscellaneous XDR error
2313                  * it will be set to nfserr_bad_xdr.
2314                  */
2315                 if (op->status) {
2316                         if (op->opnum == OP_OPEN)
2317                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
2318                         goto encode_op;
2319                 }
2320                 if (!current_fh->fh_dentry &&
2321                                 !HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2322                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2323                                 op->status = nfserr_nofilehandle;
2324                                 goto encode_op;
2325                         }
2326                 } else if (current_fh->fh_export &&
2327                            current_fh->fh_export->ex_fslocs.migrated &&
2328                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2329                         op->status = nfserr_moved;
2330                         goto encode_op;
2331                 }
2332
2333                 fh_clear_wcc(current_fh);
2334
2335                 /* If op is non-idempotent */
2336                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2337                         /*
2338                          * Don't execute this op if we couldn't encode a
2339                          * succesful reply:
2340                          */
2341                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2342                         /*
2343                          * Plus if there's another operation, make sure
2344                          * we'll have space to at least encode an error:
2345                          */
2346                         if (resp->opcnt < args->opcnt)
2347                                 plen += COMPOUND_ERR_SLACK_SPACE;
2348                         op->status = nfsd4_check_resp_size(resp, plen);
2349                 }
2350
2351                 if (op->status)
2352                         goto encode_op;
2353
2354                 if (op->opdesc->op_get_currentstateid)
2355                         op->opdesc->op_get_currentstateid(cstate, &op->u);
2356                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2357
2358                 /* Only from SEQUENCE */
2359                 if (cstate->status == nfserr_replay_cache) {
2360                         dprintk("%s NFS4.1 replay from cache\n", __func__);
2361                         status = op->status;
2362                         goto out;
2363                 }
2364                 if (!op->status) {
2365                         if (op->opdesc->op_set_currentstateid)
2366                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
2367
2368                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2369                                 clear_current_stateid(cstate);
2370
2371                         if (current_fh->fh_export &&
2372                                         need_wrongsec_check(rqstp))
2373                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2374                 }
2375 encode_op:
2376                 if (op->status == nfserr_replay_me) {
2377                         op->replay = &cstate->replay_owner->so_replay;
2378                         nfsd4_encode_replay(&resp->xdr, op);
2379                         status = op->status = op->replay->rp_status;
2380                 } else {
2381                         nfsd4_encode_operation(resp, op);
2382                         status = op->status;
2383                 }
2384
2385                 trace_nfsd_compound_status(args->opcnt, resp->opcnt, status,
2386                                            nfsd4_op_name(op->opnum));
2387
2388                 nfsd4_cstate_clear_replay(cstate);
2389                 nfsd4_increment_op_stats(op->opnum);
2390         }
2391
2392         cstate->status = status;
2393         fh_put(current_fh);
2394         fh_put(save_fh);
2395         BUG_ON(cstate->replay_owner);
2396 out:
2397         /* Reset deferral mechanism for RPC deferrals */
2398         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2399         dprintk("nfsv4 compound returned %d\n", ntohl(status));
2400         return status;
2401 }
2402
2403 #define op_encode_hdr_size              (2)
2404 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
2405 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2406 #define op_encode_change_info_maxsz     (5)
2407 #define nfs4_fattr_bitmap_maxsz         (4)
2408
2409 /* We'll fall back on returning no lockowner if run out of space: */
2410 #define op_encode_lockowner_maxsz       (0)
2411 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
2412
2413 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
2414
2415 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
2416 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
2417                                          op_encode_ace_maxsz)
2418
2419 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
2420
2421 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2422 {
2423         return (op_encode_hdr_size) * sizeof(__be32);
2424 }
2425
2426 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2427 {
2428         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2429 }
2430
2431 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2432 {
2433         /* ac_supported, ac_resp_access */
2434         return (op_encode_hdr_size + 2)* sizeof(__be32);
2435 }
2436
2437 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2438 {
2439         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2440 }
2441
2442 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2443 {
2444         return (op_encode_hdr_size + op_encode_change_info_maxsz
2445                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2446 }
2447
2448 /*
2449  * Note since this is an idempotent operation we won't insist on failing
2450  * the op prematurely if the estimate is too large.  We may turn off splice
2451  * reads unnecessarily.
2452  */
2453 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
2454                                       struct nfsd4_op *op)
2455 {
2456         u32 *bmap = op->u.getattr.ga_bmval;
2457         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2458         u32 ret = 0;
2459
2460         if (bmap0 & FATTR4_WORD0_ACL)
2461                 return svc_max_payload(rqstp);
2462         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2463                 return svc_max_payload(rqstp);
2464
2465         if (bmap1 & FATTR4_WORD1_OWNER) {
2466                 ret += IDMAP_NAMESZ + 4;
2467                 bmap1 &= ~FATTR4_WORD1_OWNER;
2468         }
2469         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2470                 ret += IDMAP_NAMESZ + 4;
2471                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2472         }
2473         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2474                 ret += NFS4_FHSIZE + 4;
2475                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2476         }
2477         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2478                 ret += NFS4_MAXLABELLEN + 12;
2479                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2480         }
2481         /*
2482          * Largest of remaining attributes are 16 bytes (e.g.,
2483          * supported_attributes)
2484          */
2485         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2486         /* bitmask, length */
2487         ret += 20;
2488         return ret;
2489 }
2490
2491 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2492 {
2493         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2494 }
2495
2496 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2497 {
2498         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2499                 * sizeof(__be32);
2500 }
2501
2502 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2503 {
2504         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2505                 * sizeof(__be32);
2506 }
2507
2508 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2509 {
2510         return (op_encode_hdr_size + op_encode_stateid_maxsz
2511                 + op_encode_change_info_maxsz + 1
2512                 + nfs4_fattr_bitmap_maxsz
2513                 + op_encode_delegation_maxsz) * sizeof(__be32);
2514 }
2515
2516 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2517 {
2518         u32 maxcount = 0, rlen = 0;
2519
2520         maxcount = svc_max_payload(rqstp);
2521         rlen = min(op->u.read.rd_length, maxcount);
2522
2523         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2524 }
2525
2526 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2527 {
2528         u32 maxcount = 0, rlen = 0;
2529
2530         maxcount = svc_max_payload(rqstp);
2531         rlen = min(op->u.readdir.rd_maxcount, maxcount);
2532
2533         return (op_encode_hdr_size + op_encode_verifier_maxsz +
2534                 XDR_QUADLEN(rlen)) * sizeof(__be32);
2535 }
2536
2537 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2538 {
2539         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2540 }
2541
2542 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2543 {
2544         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2545                 * sizeof(__be32);
2546 }
2547
2548 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2549 {
2550         return (op_encode_hdr_size + op_encode_change_info_maxsz
2551                 + op_encode_change_info_maxsz) * sizeof(__be32);
2552 }
2553
2554 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
2555                                        struct nfsd4_op *op)
2556 {
2557         return (op_encode_hdr_size
2558                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
2559 }
2560
2561 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2562 {
2563         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
2564                 * sizeof(__be32);
2565 }
2566
2567 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2568 {
2569         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2570 }
2571
2572 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2573 {
2574         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2575                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2576 }
2577
2578 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2579 {
2580         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2581                                                                 sizeof(__be32);
2582 }
2583
2584 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2585 {
2586         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2587 }
2588
2589 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2590 {
2591         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2592                 1 + 1 + /* eir_flags, spr_how */\
2593                 4 + /* spo_must_enforce & _allow with bitmap */\
2594                 2 + /*eir_server_owner.so_minor_id */\
2595                 /* eir_server_owner.so_major_id<> */\
2596                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2597                 /* eir_server_scope<> */\
2598                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2599                 1 + /* eir_server_impl_id array length */\
2600                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2601 }
2602
2603 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2604 {
2605         return (op_encode_hdr_size + \
2606                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2607                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2608 }
2609
2610 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2611 {
2612         return (op_encode_hdr_size + \
2613                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2614                 2 + /* csr_sequence, csr_flags */\
2615                 op_encode_channel_attrs_maxsz + \
2616                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2617 }
2618
2619 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2620 {
2621         return (op_encode_hdr_size +
2622                 1 /* wr_callback */ +
2623                 op_encode_stateid_maxsz /* wr_callback */ +
2624                 2 /* wr_count */ +
2625                 1 /* wr_committed */ +
2626                 op_encode_verifier_maxsz +
2627                 1 /* cr_consecutive */ +
2628                 1 /* cr_synchronous */) * sizeof(__be32);
2629 }
2630
2631 static inline u32 nfsd4_offload_status_rsize(struct svc_rqst *rqstp,
2632                                              struct nfsd4_op *op)
2633 {
2634         return (op_encode_hdr_size +
2635                 2 /* osr_count */ +
2636                 1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
2637 }
2638
2639 static inline u32 nfsd4_copy_notify_rsize(struct svc_rqst *rqstp,
2640                                         struct nfsd4_op *op)
2641 {
2642         return (op_encode_hdr_size +
2643                 3 /* cnr_lease_time */ +
2644                 1 /* We support one cnr_source_server */ +
2645                 1 /* cnr_stateid seq */ +
2646                 op_encode_stateid_maxsz /* cnr_stateid */ +
2647                 1 /* num cnr_source_server*/ +
2648                 1 /* nl4_type */ +
2649                 1 /* nl4 size */ +
2650                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
2651                 * sizeof(__be32);
2652 }
2653
2654 #ifdef CONFIG_NFSD_PNFS
2655 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2656 {
2657         u32 maxcount = 0, rlen = 0;
2658
2659         maxcount = svc_max_payload(rqstp);
2660         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2661
2662         return (op_encode_hdr_size +
2663                 1 /* gd_layout_type*/ +
2664                 XDR_QUADLEN(rlen) +
2665                 2 /* gd_notify_types */) * sizeof(__be32);
2666 }
2667
2668 /*
2669  * At this stage we don't really know what layout driver will handle the request,
2670  * so we need to define an arbitrary upper bound here.
2671  */
2672 #define MAX_LAYOUT_SIZE         128
2673 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2674 {
2675         return (op_encode_hdr_size +
2676                 1 /* logr_return_on_close */ +
2677                 op_encode_stateid_maxsz +
2678                 1 /* nr of layouts */ +
2679                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2680 }
2681
2682 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2683 {
2684         return (op_encode_hdr_size +
2685                 1 /* locr_newsize */ +
2686                 2 /* ns_size */) * sizeof(__be32);
2687 }
2688
2689 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2690 {
2691         return (op_encode_hdr_size +
2692                 1 /* lrs_stateid */ +
2693                 op_encode_stateid_maxsz) * sizeof(__be32);
2694 }
2695 #endif /* CONFIG_NFSD_PNFS */
2696
2697
2698 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2699 {
2700         return (op_encode_hdr_size + 3) * sizeof(__be32);
2701 }
2702
2703 static const struct nfsd4_operation nfsd4_ops[] = {
2704         [OP_ACCESS] = {
2705                 .op_func = nfsd4_access,
2706                 .op_name = "OP_ACCESS",
2707                 .op_rsize_bop = nfsd4_access_rsize,
2708         },
2709         [OP_CLOSE] = {
2710                 .op_func = nfsd4_close,
2711                 .op_flags = OP_MODIFIES_SOMETHING,
2712                 .op_name = "OP_CLOSE",
2713                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2714                 .op_get_currentstateid = nfsd4_get_closestateid,
2715                 .op_set_currentstateid = nfsd4_set_closestateid,
2716         },
2717         [OP_COMMIT] = {
2718                 .op_func = nfsd4_commit,
2719                 .op_flags = OP_MODIFIES_SOMETHING,
2720                 .op_name = "OP_COMMIT",
2721                 .op_rsize_bop = nfsd4_commit_rsize,
2722         },
2723         [OP_CREATE] = {
2724                 .op_func = nfsd4_create,
2725                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2726                 .op_name = "OP_CREATE",
2727                 .op_rsize_bop = nfsd4_create_rsize,
2728         },
2729         [OP_DELEGRETURN] = {
2730                 .op_func = nfsd4_delegreturn,
2731                 .op_flags = OP_MODIFIES_SOMETHING,
2732                 .op_name = "OP_DELEGRETURN",
2733                 .op_rsize_bop = nfsd4_only_status_rsize,
2734                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2735         },
2736         [OP_GETATTR] = {
2737                 .op_func = nfsd4_getattr,
2738                 .op_flags = ALLOWED_ON_ABSENT_FS,
2739                 .op_rsize_bop = nfsd4_getattr_rsize,
2740                 .op_name = "OP_GETATTR",
2741         },
2742         [OP_GETFH] = {
2743                 .op_func = nfsd4_getfh,
2744                 .op_name = "OP_GETFH",
2745                 .op_rsize_bop = nfsd4_getfh_rsize,
2746         },
2747         [OP_LINK] = {
2748                 .op_func = nfsd4_link,
2749                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2750                                 | OP_CACHEME,
2751                 .op_name = "OP_LINK",
2752                 .op_rsize_bop = nfsd4_link_rsize,
2753         },
2754         [OP_LOCK] = {
2755                 .op_func = nfsd4_lock,
2756                 .op_flags = OP_MODIFIES_SOMETHING |
2757                                 OP_NONTRIVIAL_ERROR_ENCODE,
2758                 .op_name = "OP_LOCK",
2759                 .op_rsize_bop = nfsd4_lock_rsize,
2760                 .op_set_currentstateid = nfsd4_set_lockstateid,
2761         },
2762         [OP_LOCKT] = {
2763                 .op_func = nfsd4_lockt,
2764                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2765                 .op_name = "OP_LOCKT",
2766                 .op_rsize_bop = nfsd4_lock_rsize,
2767         },
2768         [OP_LOCKU] = {
2769                 .op_func = nfsd4_locku,
2770                 .op_flags = OP_MODIFIES_SOMETHING,
2771                 .op_name = "OP_LOCKU",
2772                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2773                 .op_get_currentstateid = nfsd4_get_lockustateid,
2774         },
2775         [OP_LOOKUP] = {
2776                 .op_func = nfsd4_lookup,
2777                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2778                 .op_name = "OP_LOOKUP",
2779                 .op_rsize_bop = nfsd4_only_status_rsize,
2780         },
2781         [OP_LOOKUPP] = {
2782                 .op_func = nfsd4_lookupp,
2783                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2784                 .op_name = "OP_LOOKUPP",
2785                 .op_rsize_bop = nfsd4_only_status_rsize,
2786         },
2787         [OP_NVERIFY] = {
2788                 .op_func = nfsd4_nverify,
2789                 .op_name = "OP_NVERIFY",
2790                 .op_rsize_bop = nfsd4_only_status_rsize,
2791         },
2792         [OP_OPEN] = {
2793                 .op_func = nfsd4_open,
2794                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2795                 .op_name = "OP_OPEN",
2796                 .op_rsize_bop = nfsd4_open_rsize,
2797                 .op_set_currentstateid = nfsd4_set_openstateid,
2798         },
2799         [OP_OPEN_CONFIRM] = {
2800                 .op_func = nfsd4_open_confirm,
2801                 .op_flags = OP_MODIFIES_SOMETHING,
2802                 .op_name = "OP_OPEN_CONFIRM",
2803                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2804         },
2805         [OP_OPEN_DOWNGRADE] = {
2806                 .op_func = nfsd4_open_downgrade,
2807                 .op_flags = OP_MODIFIES_SOMETHING,
2808                 .op_name = "OP_OPEN_DOWNGRADE",
2809                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2810                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2811                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2812         },
2813         [OP_PUTFH] = {
2814                 .op_func = nfsd4_putfh,
2815                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2816                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2817                 .op_name = "OP_PUTFH",
2818                 .op_rsize_bop = nfsd4_only_status_rsize,
2819         },
2820         [OP_PUTPUBFH] = {
2821                 .op_func = nfsd4_putrootfh,
2822                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2823                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2824                 .op_name = "OP_PUTPUBFH",
2825                 .op_rsize_bop = nfsd4_only_status_rsize,
2826         },
2827         [OP_PUTROOTFH] = {
2828                 .op_func = nfsd4_putrootfh,
2829                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2830                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2831                 .op_name = "OP_PUTROOTFH",
2832                 .op_rsize_bop = nfsd4_only_status_rsize,
2833         },
2834         [OP_READ] = {
2835                 .op_func = nfsd4_read,
2836                 .op_release = nfsd4_read_release,
2837                 .op_name = "OP_READ",
2838                 .op_rsize_bop = nfsd4_read_rsize,
2839                 .op_get_currentstateid = nfsd4_get_readstateid,
2840         },
2841         [OP_READDIR] = {
2842                 .op_func = nfsd4_readdir,
2843                 .op_name = "OP_READDIR",
2844                 .op_rsize_bop = nfsd4_readdir_rsize,
2845         },
2846         [OP_READLINK] = {
2847                 .op_func = nfsd4_readlink,
2848                 .op_name = "OP_READLINK",
2849                 .op_rsize_bop = nfsd4_readlink_rsize,
2850         },
2851         [OP_REMOVE] = {
2852                 .op_func = nfsd4_remove,
2853                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2854                 .op_name = "OP_REMOVE",
2855                 .op_rsize_bop = nfsd4_remove_rsize,
2856         },
2857         [OP_RENAME] = {
2858                 .op_func = nfsd4_rename,
2859                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2860                 .op_name = "OP_RENAME",
2861                 .op_rsize_bop = nfsd4_rename_rsize,
2862         },
2863         [OP_RENEW] = {
2864                 .op_func = nfsd4_renew,
2865                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2866                                 | OP_MODIFIES_SOMETHING,
2867                 .op_name = "OP_RENEW",
2868                 .op_rsize_bop = nfsd4_only_status_rsize,
2869
2870         },
2871         [OP_RESTOREFH] = {
2872                 .op_func = nfsd4_restorefh,
2873                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2874                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2875                 .op_name = "OP_RESTOREFH",
2876                 .op_rsize_bop = nfsd4_only_status_rsize,
2877         },
2878         [OP_SAVEFH] = {
2879                 .op_func = nfsd4_savefh,
2880                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2881                 .op_name = "OP_SAVEFH",
2882                 .op_rsize_bop = nfsd4_only_status_rsize,
2883         },
2884         [OP_SECINFO] = {
2885                 .op_func = nfsd4_secinfo,
2886                 .op_release = nfsd4_secinfo_release,
2887                 .op_flags = OP_HANDLES_WRONGSEC,
2888                 .op_name = "OP_SECINFO",
2889                 .op_rsize_bop = nfsd4_secinfo_rsize,
2890         },
2891         [OP_SETATTR] = {
2892                 .op_func = nfsd4_setattr,
2893                 .op_name = "OP_SETATTR",
2894                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2895                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2896                 .op_rsize_bop = nfsd4_setattr_rsize,
2897                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2898         },
2899         [OP_SETCLIENTID] = {
2900                 .op_func = nfsd4_setclientid,
2901                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2902                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2903                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2904                 .op_name = "OP_SETCLIENTID",
2905                 .op_rsize_bop = nfsd4_setclientid_rsize,
2906         },
2907         [OP_SETCLIENTID_CONFIRM] = {
2908                 .op_func = nfsd4_setclientid_confirm,
2909                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2910                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2911                 .op_name = "OP_SETCLIENTID_CONFIRM",
2912                 .op_rsize_bop = nfsd4_only_status_rsize,
2913         },
2914         [OP_VERIFY] = {
2915                 .op_func = nfsd4_verify,
2916                 .op_name = "OP_VERIFY",
2917                 .op_rsize_bop = nfsd4_only_status_rsize,
2918         },
2919         [OP_WRITE] = {
2920                 .op_func = nfsd4_write,
2921                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2922                 .op_name = "OP_WRITE",
2923                 .op_rsize_bop = nfsd4_write_rsize,
2924                 .op_get_currentstateid = nfsd4_get_writestateid,
2925         },
2926         [OP_RELEASE_LOCKOWNER] = {
2927                 .op_func = nfsd4_release_lockowner,
2928                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2929                                 | OP_MODIFIES_SOMETHING,
2930                 .op_name = "OP_RELEASE_LOCKOWNER",
2931                 .op_rsize_bop = nfsd4_only_status_rsize,
2932         },
2933
2934         /* NFSv4.1 operations */
2935         [OP_EXCHANGE_ID] = {
2936                 .op_func = nfsd4_exchange_id,
2937                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2938                                 | OP_MODIFIES_SOMETHING,
2939                 .op_name = "OP_EXCHANGE_ID",
2940                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2941         },
2942         [OP_BACKCHANNEL_CTL] = {
2943                 .op_func = nfsd4_backchannel_ctl,
2944                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2945                 .op_name = "OP_BACKCHANNEL_CTL",
2946                 .op_rsize_bop = nfsd4_only_status_rsize,
2947         },
2948         [OP_BIND_CONN_TO_SESSION] = {
2949                 .op_func = nfsd4_bind_conn_to_session,
2950                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2951                                 | OP_MODIFIES_SOMETHING,
2952                 .op_name = "OP_BIND_CONN_TO_SESSION",
2953                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2954         },
2955         [OP_CREATE_SESSION] = {
2956                 .op_func = nfsd4_create_session,
2957                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2958                                 | OP_MODIFIES_SOMETHING,
2959                 .op_name = "OP_CREATE_SESSION",
2960                 .op_rsize_bop = nfsd4_create_session_rsize,
2961         },
2962         [OP_DESTROY_SESSION] = {
2963                 .op_func = nfsd4_destroy_session,
2964                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2965                                 | OP_MODIFIES_SOMETHING,
2966                 .op_name = "OP_DESTROY_SESSION",
2967                 .op_rsize_bop = nfsd4_only_status_rsize,
2968         },
2969         [OP_SEQUENCE] = {
2970                 .op_func = nfsd4_sequence,
2971                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2972                 .op_name = "OP_SEQUENCE",
2973                 .op_rsize_bop = nfsd4_sequence_rsize,
2974         },
2975         [OP_DESTROY_CLIENTID] = {
2976                 .op_func = nfsd4_destroy_clientid,
2977                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2978                                 | OP_MODIFIES_SOMETHING,
2979                 .op_name = "OP_DESTROY_CLIENTID",
2980                 .op_rsize_bop = nfsd4_only_status_rsize,
2981         },
2982         [OP_RECLAIM_COMPLETE] = {
2983                 .op_func = nfsd4_reclaim_complete,
2984                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2985                 .op_name = "OP_RECLAIM_COMPLETE",
2986                 .op_rsize_bop = nfsd4_only_status_rsize,
2987         },
2988         [OP_SECINFO_NO_NAME] = {
2989                 .op_func = nfsd4_secinfo_no_name,
2990                 .op_release = nfsd4_secinfo_no_name_release,
2991                 .op_flags = OP_HANDLES_WRONGSEC,
2992                 .op_name = "OP_SECINFO_NO_NAME",
2993                 .op_rsize_bop = nfsd4_secinfo_rsize,
2994         },
2995         [OP_TEST_STATEID] = {
2996                 .op_func = nfsd4_test_stateid,
2997                 .op_flags = ALLOWED_WITHOUT_FH,
2998                 .op_name = "OP_TEST_STATEID",
2999                 .op_rsize_bop = nfsd4_test_stateid_rsize,
3000         },
3001         [OP_FREE_STATEID] = {
3002                 .op_func = nfsd4_free_stateid,
3003                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3004                 .op_name = "OP_FREE_STATEID",
3005                 .op_get_currentstateid = nfsd4_get_freestateid,
3006                 .op_rsize_bop = nfsd4_only_status_rsize,
3007         },
3008 #ifdef CONFIG_NFSD_PNFS
3009         [OP_GETDEVICEINFO] = {
3010                 .op_func = nfsd4_getdeviceinfo,
3011                 .op_release = nfsd4_getdeviceinfo_release,
3012                 .op_flags = ALLOWED_WITHOUT_FH,
3013                 .op_name = "OP_GETDEVICEINFO",
3014                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3015         },
3016         [OP_LAYOUTGET] = {
3017                 .op_func = nfsd4_layoutget,
3018                 .op_release = nfsd4_layoutget_release,
3019                 .op_flags = OP_MODIFIES_SOMETHING,
3020                 .op_name = "OP_LAYOUTGET",
3021                 .op_rsize_bop = nfsd4_layoutget_rsize,
3022         },
3023         [OP_LAYOUTCOMMIT] = {
3024                 .op_func = nfsd4_layoutcommit,
3025                 .op_flags = OP_MODIFIES_SOMETHING,
3026                 .op_name = "OP_LAYOUTCOMMIT",
3027                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
3028         },
3029         [OP_LAYOUTRETURN] = {
3030                 .op_func = nfsd4_layoutreturn,
3031                 .op_flags = OP_MODIFIES_SOMETHING,
3032                 .op_name = "OP_LAYOUTRETURN",
3033                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
3034         },
3035 #endif /* CONFIG_NFSD_PNFS */
3036
3037         /* NFSv4.2 operations */
3038         [OP_ALLOCATE] = {
3039                 .op_func = nfsd4_allocate,
3040                 .op_flags = OP_MODIFIES_SOMETHING,
3041                 .op_name = "OP_ALLOCATE",
3042                 .op_rsize_bop = nfsd4_only_status_rsize,
3043         },
3044         [OP_DEALLOCATE] = {
3045                 .op_func = nfsd4_deallocate,
3046                 .op_flags = OP_MODIFIES_SOMETHING,
3047                 .op_name = "OP_DEALLOCATE",
3048                 .op_rsize_bop = nfsd4_only_status_rsize,
3049         },
3050         [OP_CLONE] = {
3051                 .op_func = nfsd4_clone,
3052                 .op_flags = OP_MODIFIES_SOMETHING,
3053                 .op_name = "OP_CLONE",
3054                 .op_rsize_bop = nfsd4_only_status_rsize,
3055         },
3056         [OP_COPY] = {
3057                 .op_func = nfsd4_copy,
3058                 .op_flags = OP_MODIFIES_SOMETHING,
3059                 .op_name = "OP_COPY",
3060                 .op_rsize_bop = nfsd4_copy_rsize,
3061         },
3062         [OP_SEEK] = {
3063                 .op_func = nfsd4_seek,
3064                 .op_name = "OP_SEEK",
3065                 .op_rsize_bop = nfsd4_seek_rsize,
3066         },
3067         [OP_OFFLOAD_STATUS] = {
3068                 .op_func = nfsd4_offload_status,
3069                 .op_name = "OP_OFFLOAD_STATUS",
3070                 .op_rsize_bop = nfsd4_offload_status_rsize,
3071         },
3072         [OP_OFFLOAD_CANCEL] = {
3073                 .op_func = nfsd4_offload_cancel,
3074                 .op_flags = OP_MODIFIES_SOMETHING,
3075                 .op_name = "OP_OFFLOAD_CANCEL",
3076                 .op_rsize_bop = nfsd4_only_status_rsize,
3077         },
3078         [OP_COPY_NOTIFY] = {
3079                 .op_func = nfsd4_copy_notify,
3080                 .op_flags = OP_MODIFIES_SOMETHING,
3081                 .op_name = "OP_COPY_NOTIFY",
3082                 .op_rsize_bop = nfsd4_copy_notify_rsize,
3083         },
3084 };
3085
3086 /**
3087  * nfsd4_spo_must_allow - Determine if the compound op contains an
3088  * operation that is allowed to be sent with machine credentials
3089  *
3090  * @rqstp: a pointer to the struct svc_rqst
3091  *
3092  * Checks to see if the compound contains a spo_must_allow op
3093  * and confirms that it was sent with the proper machine creds.
3094  */
3095
3096 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3097 {
3098         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3099         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3100         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
3101         struct nfsd4_compound_state *cstate = &resp->cstate;
3102         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3103         u32 opiter;
3104
3105         if (!cstate->minorversion)
3106                 return false;
3107
3108         if (cstate->spo_must_allowed == true)
3109                 return true;
3110
3111         opiter = resp->opcnt;
3112         while (opiter < argp->opcnt) {
3113                 this = &argp->ops[opiter++];
3114                 if (test_bit(this->opnum, allow->u.longs) &&
3115                         cstate->clp->cl_mach_cred &&
3116                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3117                         cstate->spo_must_allowed = true;
3118                         return true;
3119                 }
3120         }
3121         cstate->spo_must_allowed = false;
3122         return false;
3123 }
3124
3125 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3126 {
3127         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3128                 return op_encode_hdr_size * sizeof(__be32);
3129
3130         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3131         return OPDESC(op)->op_rsize_bop(rqstp, op);
3132 }
3133
3134 void warn_on_nonidempotent_op(struct nfsd4_op *op)
3135 {
3136         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3137                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
3138                         op->opnum, nfsd4_op_name(op->opnum));
3139                 WARN_ON_ONCE(1);
3140         }
3141 }
3142
3143 static const char *nfsd4_op_name(unsigned opnum)
3144 {
3145         if (opnum < ARRAY_SIZE(nfsd4_ops))
3146                 return nfsd4_ops[opnum].op_name;
3147         return "unknown_operation";
3148 }
3149
3150 #define nfsd4_voidres                   nfsd4_voidargs
3151 struct nfsd4_voidargs { int dummy; };
3152
3153 static const struct svc_procedure nfsd_procedures4[2] = {
3154         [NFSPROC4_NULL] = {
3155                 .pc_func = nfsd4_proc_null,
3156                 .pc_encode = nfs4svc_encode_voidres,
3157                 .pc_argsize = sizeof(struct nfsd4_voidargs),
3158                 .pc_ressize = sizeof(struct nfsd4_voidres),
3159                 .pc_cachetype = RC_NOCACHE,
3160                 .pc_xdrressize = 1,
3161         },
3162         [NFSPROC4_COMPOUND] = {
3163                 .pc_func = nfsd4_proc_compound,
3164                 .pc_decode = nfs4svc_decode_compoundargs,
3165                 .pc_encode = nfs4svc_encode_compoundres,
3166                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
3167                 .pc_ressize = sizeof(struct nfsd4_compoundres),
3168                 .pc_release = nfsd4_release_compoundargs,
3169                 .pc_cachetype = RC_NOCACHE,
3170                 .pc_xdrressize = NFSD_BUFSIZE/4,
3171         },
3172 };
3173
3174 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
3175 const struct svc_version nfsd_version4 = {
3176         .vs_vers                = 4,
3177         .vs_nproc               = 2,
3178         .vs_proc                = nfsd_procedures4,
3179         .vs_count               = nfsd_count3,
3180         .vs_dispatch            = nfsd_dispatch,
3181         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
3182         .vs_rpcb_optnl          = true,
3183         .vs_need_cong_ctrl      = true,
3184 };
3185
3186 /*
3187  * Local variables:
3188  *  c-basic-offset: 8
3189  * End:
3190  */