nfsd4: cleanup handling of nfsv4.0 closed stateid's
[linux-3.10.git] / fs / nfsd / nfs4proc.c
1 /*
2  *  Server-side procedures for NFSv4.
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  */
35 #include <linux/file.h>
36 #include <linux/slab.h>
37
38 #include "idmap.h"
39 #include "cache.h"
40 #include "xdr4.h"
41 #include "vfs.h"
42 #include "current_stateid.h"
43 #include "netns.h"
44
45 #define NFSDDBG_FACILITY                NFSDDBG_PROC
46
47 static u32 nfsd_attrmask[] = {
48         NFSD_WRITEABLE_ATTRS_WORD0,
49         NFSD_WRITEABLE_ATTRS_WORD1,
50         NFSD_WRITEABLE_ATTRS_WORD2
51 };
52
53 static u32 nfsd41_ex_attrmask[] = {
54         NFSD_SUPPATTR_EXCLCREAT_WORD0,
55         NFSD_SUPPATTR_EXCLCREAT_WORD1,
56         NFSD_SUPPATTR_EXCLCREAT_WORD2
57 };
58
59 static __be32
60 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
61                    u32 *bmval, u32 *writable)
62 {
63         struct dentry *dentry = cstate->current_fh.fh_dentry;
64
65         /*
66          * Check about attributes are supported by the NFSv4 server or not.
67          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
68          */
69         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
70             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
71             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
72                 return nfserr_attrnotsupp;
73
74         /*
75          * Check FATTR4_WORD0_ACL can be supported
76          * in current environment or not.
77          */
78         if (bmval[0] & FATTR4_WORD0_ACL) {
79                 if (!IS_POSIXACL(dentry->d_inode))
80                         return nfserr_attrnotsupp;
81         }
82
83         /*
84          * According to spec, read-only attributes return ERR_INVAL.
85          */
86         if (writable) {
87                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
88                     (bmval[2] & ~writable[2]))
89                         return nfserr_inval;
90         }
91
92         return nfs_ok;
93 }
94
95 static __be32
96 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
97         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
98 {
99         __be32 status = nfs_ok;
100
101         if (open->op_create == NFS4_OPEN_CREATE) {
102                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
103                     || open->op_createmode == NFS4_CREATE_GUARDED)
104                         status = check_attr_support(rqstp, cstate,
105                                         open->op_bmval, nfsd_attrmask);
106                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
107                         status = check_attr_support(rqstp, cstate,
108                                         open->op_bmval, nfsd41_ex_attrmask);
109         }
110
111         return status;
112 }
113
114 static int
115 is_create_with_attrs(struct nfsd4_open *open)
116 {
117         return open->op_create == NFS4_OPEN_CREATE
118                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
119                     || open->op_createmode == NFS4_CREATE_GUARDED
120                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
121 }
122
123 /*
124  * if error occurs when setting the acl, just clear the acl bit
125  * in the returned attr bitmap.
126  */
127 static void
128 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
129                 struct nfs4_acl *acl, u32 *bmval)
130 {
131         __be32 status;
132
133         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
134         if (status)
135                 /*
136                  * We should probably fail the whole open at this point,
137                  * but we've already created the file, so it's too late;
138                  * So this seems the least of evils:
139                  */
140                 bmval[0] &= ~FATTR4_WORD0_ACL;
141 }
142
143 static inline void
144 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
145 {
146         fh_put(dst);
147         dget(src->fh_dentry);
148         if (src->fh_export)
149                 cache_get(&src->fh_export->h);
150         *dst = *src;
151 }
152
153 static __be32
154 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
155 {
156         __be32 status;
157
158         if (open->op_truncate &&
159                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
160                 return nfserr_inval;
161
162         accmode |= NFSD_MAY_READ_IF_EXEC;
163
164         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
165                 accmode |= NFSD_MAY_READ;
166         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
167                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
168         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
169                 accmode |= NFSD_MAY_WRITE;
170
171         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
172
173         return status;
174 }
175
176 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
177 {
178         umode_t mode = fh->fh_dentry->d_inode->i_mode;
179
180         if (S_ISREG(mode))
181                 return nfs_ok;
182         if (S_ISDIR(mode))
183                 return nfserr_isdir;
184         /*
185          * Using err_symlink as our catch-all case may look odd; but
186          * there's no other obvious error for this case in 4.0, and we
187          * happen to know that it will cause the linux v4 client to do
188          * the right thing on attempts to open something other than a
189          * regular file.
190          */
191         return nfserr_symlink;
192 }
193
194 static __be32
195 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
196 {
197         struct svc_fh *resfh;
198         int accmode;
199         __be32 status;
200
201         resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
202         if (!resfh)
203                 return nfserr_jukebox;
204         fh_init(resfh, NFS4_FHSIZE);
205         open->op_truncate = 0;
206
207         if (open->op_create) {
208                 /* FIXME: check session persistence and pnfs flags.
209                  * The nfsv4.1 spec requires the following semantics:
210                  *
211                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
212                  * Reply Cache  | server |                 |
213                  * -------------+--------+-----------------+--------------------
214                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
215                  *              |        |                 | (SHOULD)
216                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
217                  *              |        |                 | (SHOULD NOT)
218                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
219                  * yes          | no     | GUARDED4        | GUARDED4
220                  * yes          | yes    | GUARDED4        | GUARDED4
221                  */
222
223                 /*
224                  * Note: create modes (UNCHECKED,GUARDED...) are the same
225                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
226                  */
227                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
228                                         open->op_fname.len, &open->op_iattr,
229                                         resfh, open->op_createmode,
230                                         (u32 *)open->op_verf.data,
231                                         &open->op_truncate, &open->op_created);
232
233                 /*
234                  * Following rfc 3530 14.2.16, use the returned bitmask
235                  * to indicate which attributes we used to store the
236                  * verifier:
237                  */
238                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
239                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
240                                                         FATTR4_WORD1_TIME_MODIFY);
241         } else {
242                 status = nfsd_lookup(rqstp, current_fh,
243                                      open->op_fname.data, open->op_fname.len, resfh);
244                 fh_unlock(current_fh);
245         }
246         if (status)
247                 goto out;
248         status = nfsd_check_obj_isreg(resfh);
249         if (status)
250                 goto out;
251
252         if (is_create_with_attrs(open) && open->op_acl != NULL)
253                 do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
254
255         /* set reply cache */
256         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
257                         &resfh->fh_handle);
258         accmode = NFSD_MAY_NOP;
259         if (open->op_created)
260                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
261         status = do_open_permission(rqstp, resfh, open, accmode);
262         set_change_info(&open->op_cinfo, current_fh);
263         fh_dup2(current_fh, resfh);
264 out:
265         fh_put(resfh);
266         kfree(resfh);
267         return status;
268 }
269
270 static __be32
271 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
272 {
273         __be32 status;
274
275         /* We don't know the target directory, and therefore can not
276         * set the change info
277         */
278
279         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
280
281         /* set replay cache */
282         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
283                         &current_fh->fh_handle);
284
285         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
286                 (open->op_iattr.ia_size == 0);
287
288         status = do_open_permission(rqstp, current_fh, open,
289                                     NFSD_MAY_OWNER_OVERRIDE);
290
291         return status;
292 }
293
294 static void
295 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
296 {
297         struct nfsd4_sessionid *sid =
298                         (struct nfsd4_sessionid *)session->se_sessionid.data;
299
300         clid->cl_boot = sid->clientid.cl_boot;
301         clid->cl_id = sid->clientid.cl_id;
302 }
303
304 static __be32
305 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
306            struct nfsd4_open *open)
307 {
308         __be32 status;
309         struct nfsd4_compoundres *resp;
310         struct net *net = SVC_NET(rqstp);
311         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
312
313         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
314                 (int)open->op_fname.len, open->op_fname.data,
315                 open->op_openowner);
316
317         /* This check required by spec. */
318         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
319                 return nfserr_inval;
320
321         open->op_created = 0;
322         /*
323          * RFC5661 18.51.3
324          * Before RECLAIM_COMPLETE done, server should deny new lock
325          */
326         if (nfsd4_has_session(cstate) &&
327             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
328                       &cstate->session->se_client->cl_flags) &&
329             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
330                 return nfserr_grace;
331
332         if (nfsd4_has_session(cstate))
333                 copy_clientid(&open->op_clientid, cstate->session);
334
335         nfs4_lock_state();
336
337         /* check seqid for replay. set nfs4_owner */
338         resp = rqstp->rq_resp;
339         status = nfsd4_process_open1(&resp->cstate, open, nn);
340         if (status == nfserr_replay_me) {
341                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
342                 fh_put(&cstate->current_fh);
343                 fh_copy_shallow(&cstate->current_fh.fh_handle,
344                                 &rp->rp_openfh);
345                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
346                 if (status)
347                         dprintk("nfsd4_open: replay failed"
348                                 " restoring previous filehandle\n");
349                 else
350                         status = nfserr_replay_me;
351         }
352         if (status)
353                 goto out;
354         if (open->op_xdr_error) {
355                 status = open->op_xdr_error;
356                 goto out;
357         }
358
359         status = nfsd4_check_open_attributes(rqstp, cstate, open);
360         if (status)
361                 goto out;
362
363         /* Openowner is now set, so sequence id will get bumped.  Now we need
364          * these checks before we do any creates: */
365         status = nfserr_grace;
366         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
367                 goto out;
368         status = nfserr_no_grace;
369         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
370                 goto out;
371
372         switch (open->op_claim_type) {
373                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
374                 case NFS4_OPEN_CLAIM_NULL:
375                         status = do_open_lookup(rqstp, &cstate->current_fh,
376                                                 open);
377                         if (status)
378                                 goto out;
379                         break;
380                 case NFS4_OPEN_CLAIM_PREVIOUS:
381                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
382                         status = nfs4_check_open_reclaim(&open->op_clientid,
383                                                          cstate->minorversion,
384                                                          nn);
385                         if (status)
386                                 goto out;
387                 case NFS4_OPEN_CLAIM_FH:
388                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
389                         status = do_open_fhandle(rqstp, &cstate->current_fh,
390                                                  open);
391                         if (status)
392                                 goto out;
393                         break;
394                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
395                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
396                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
397                         dprintk("NFSD: unsupported OPEN claim type %d\n",
398                                 open->op_claim_type);
399                         status = nfserr_notsupp;
400                         goto out;
401                 default:
402                         dprintk("NFSD: Invalid OPEN claim type %d\n",
403                                 open->op_claim_type);
404                         status = nfserr_inval;
405                         goto out;
406         }
407         /*
408          * nfsd4_process_open2() does the actual opening of the file.  If
409          * successful, it (1) truncates the file if open->op_truncate was
410          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
411          */
412         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
413         WARN_ON(status && open->op_created);
414 out:
415         nfsd4_cleanup_open_state(open, status);
416         if (open->op_openowner)
417                 cstate->replay_owner = &open->op_openowner->oo_owner;
418         nfsd4_bump_seqid(cstate, status);
419         if (!cstate->replay_owner)
420                 nfs4_unlock_state();
421         return status;
422 }
423
424 /*
425  * OPEN is the only seqid-mutating operation whose decoding can fail
426  * with a seqid-mutating error (specifically, decoding of user names in
427  * the attributes).  Therefore we have to do some processing to look up
428  * the stateowner so that we can bump the seqid.
429  */
430 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
431 {
432         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
433
434         if (!seqid_mutating_err(ntohl(op->status)))
435                 return op->status;
436         if (nfsd4_has_session(cstate))
437                 return op->status;
438         open->op_xdr_error = op->status;
439         return nfsd4_open(rqstp, cstate, open);
440 }
441
442 /*
443  * filehandle-manipulating ops.
444  */
445 static __be32
446 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
447             struct svc_fh **getfh)
448 {
449         if (!cstate->current_fh.fh_dentry)
450                 return nfserr_nofilehandle;
451
452         *getfh = &cstate->current_fh;
453         return nfs_ok;
454 }
455
456 static __be32
457 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
458             struct nfsd4_putfh *putfh)
459 {
460         fh_put(&cstate->current_fh);
461         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
462         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
463                putfh->pf_fhlen);
464         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
465 }
466
467 static __be32
468 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
469                 void *arg)
470 {
471         __be32 status;
472
473         fh_put(&cstate->current_fh);
474         status = exp_pseudoroot(rqstp, &cstate->current_fh);
475         return status;
476 }
477
478 static __be32
479 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
480                 void *arg)
481 {
482         if (!cstate->save_fh.fh_dentry)
483                 return nfserr_restorefh;
484
485         fh_dup2(&cstate->current_fh, &cstate->save_fh);
486         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
487                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
488                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
489         }
490         return nfs_ok;
491 }
492
493 static __be32
494 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
495              void *arg)
496 {
497         if (!cstate->current_fh.fh_dentry)
498                 return nfserr_nofilehandle;
499
500         fh_dup2(&cstate->save_fh, &cstate->current_fh);
501         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
502                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
503                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
504         }
505         return nfs_ok;
506 }
507
508 /*
509  * misc nfsv4 ops
510  */
511 static __be32
512 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
513              struct nfsd4_access *access)
514 {
515         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
516                 return nfserr_inval;
517
518         access->ac_resp_access = access->ac_req_access;
519         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
520                            &access->ac_supported);
521 }
522
523 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
524 {
525         __be32 verf[2];
526         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
527
528         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
529         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
530         memcpy(verifier->data, verf, sizeof(verifier->data));
531 }
532
533 static __be32
534 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
535              struct nfsd4_commit *commit)
536 {
537         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
538         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
539                              commit->co_count);
540 }
541
542 static __be32
543 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
544              struct nfsd4_create *create)
545 {
546         struct svc_fh resfh;
547         __be32 status;
548         dev_t rdev;
549
550         fh_init(&resfh, NFS4_FHSIZE);
551
552         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
553                            NFSD_MAY_CREATE);
554         if (status)
555                 return status;
556
557         status = check_attr_support(rqstp, cstate, create->cr_bmval,
558                                     nfsd_attrmask);
559         if (status)
560                 return status;
561
562         switch (create->cr_type) {
563         case NF4LNK:
564                 /* ugh! we have to null-terminate the linktext, or
565                  * vfs_symlink() will choke.  it is always safe to
566                  * null-terminate by brute force, since at worst we
567                  * will overwrite the first byte of the create namelen
568                  * in the XDR buffer, which has already been extracted
569                  * during XDR decode.
570                  */
571                 create->cr_linkname[create->cr_linklen] = 0;
572
573                 status = nfsd_symlink(rqstp, &cstate->current_fh,
574                                       create->cr_name, create->cr_namelen,
575                                       create->cr_linkname, create->cr_linklen,
576                                       &resfh, &create->cr_iattr);
577                 break;
578
579         case NF4BLK:
580                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
581                 if (MAJOR(rdev) != create->cr_specdata1 ||
582                     MINOR(rdev) != create->cr_specdata2)
583                         return nfserr_inval;
584                 status = nfsd_create(rqstp, &cstate->current_fh,
585                                      create->cr_name, create->cr_namelen,
586                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
587                 break;
588
589         case NF4CHR:
590                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
591                 if (MAJOR(rdev) != create->cr_specdata1 ||
592                     MINOR(rdev) != create->cr_specdata2)
593                         return nfserr_inval;
594                 status = nfsd_create(rqstp, &cstate->current_fh,
595                                      create->cr_name, create->cr_namelen,
596                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
597                 break;
598
599         case NF4SOCK:
600                 status = nfsd_create(rqstp, &cstate->current_fh,
601                                      create->cr_name, create->cr_namelen,
602                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
603                 break;
604
605         case NF4FIFO:
606                 status = nfsd_create(rqstp, &cstate->current_fh,
607                                      create->cr_name, create->cr_namelen,
608                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
609                 break;
610
611         case NF4DIR:
612                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
613                 status = nfsd_create(rqstp, &cstate->current_fh,
614                                      create->cr_name, create->cr_namelen,
615                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
616                 break;
617
618         default:
619                 status = nfserr_badtype;
620         }
621
622         if (status)
623                 goto out;
624
625         if (create->cr_acl != NULL)
626                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
627                                 create->cr_bmval);
628
629         fh_unlock(&cstate->current_fh);
630         set_change_info(&create->cr_cinfo, &cstate->current_fh);
631         fh_dup2(&cstate->current_fh, &resfh);
632 out:
633         fh_put(&resfh);
634         return status;
635 }
636
637 static __be32
638 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
639               struct nfsd4_getattr *getattr)
640 {
641         __be32 status;
642
643         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
644         if (status)
645                 return status;
646
647         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
648                 return nfserr_inval;
649
650         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
651         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
652         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
653
654         getattr->ga_fhp = &cstate->current_fh;
655         return nfs_ok;
656 }
657
658 static __be32
659 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
660            struct nfsd4_link *link)
661 {
662         __be32 status = nfserr_nofilehandle;
663
664         if (!cstate->save_fh.fh_dentry)
665                 return status;
666         status = nfsd_link(rqstp, &cstate->current_fh,
667                            link->li_name, link->li_namelen, &cstate->save_fh);
668         if (!status)
669                 set_change_info(&link->li_cinfo, &cstate->current_fh);
670         return status;
671 }
672
673 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
674 {
675         struct svc_fh tmp_fh;
676         __be32 ret;
677
678         fh_init(&tmp_fh, NFS4_FHSIZE);
679         ret = exp_pseudoroot(rqstp, &tmp_fh);
680         if (ret)
681                 return ret;
682         if (tmp_fh.fh_dentry == fh->fh_dentry) {
683                 fh_put(&tmp_fh);
684                 return nfserr_noent;
685         }
686         fh_put(&tmp_fh);
687         return nfsd_lookup(rqstp, fh, "..", 2, fh);
688 }
689
690 static __be32
691 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
692               void *arg)
693 {
694         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
695 }
696
697 static __be32
698 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
699              struct nfsd4_lookup *lookup)
700 {
701         return nfsd_lookup(rqstp, &cstate->current_fh,
702                            lookup->lo_name, lookup->lo_len,
703                            &cstate->current_fh);
704 }
705
706 static __be32
707 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
708            struct nfsd4_read *read)
709 {
710         __be32 status;
711
712         /* no need to check permission - this will be done in nfsd_read() */
713
714         read->rd_filp = NULL;
715         if (read->rd_offset >= OFFSET_MAX)
716                 return nfserr_inval;
717
718         /*
719          * If we do a zero copy read, then a client will see read data
720          * that reflects the state of the file *after* performing the
721          * following compound.
722          *
723          * To ensure proper ordering, we therefore turn off zero copy if
724          * the client wants us to do more in this compound:
725          */
726         if (!nfsd4_last_compound_op(rqstp))
727                 rqstp->rq_splice_ok = false;
728
729         nfs4_lock_state();
730         /* check stateid */
731         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
732                                                  cstate, &read->rd_stateid,
733                                                  RD_STATE, &read->rd_filp))) {
734                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
735                 goto out;
736         }
737         if (read->rd_filp)
738                 get_file(read->rd_filp);
739         status = nfs_ok;
740 out:
741         nfs4_unlock_state();
742         read->rd_rqstp = rqstp;
743         read->rd_fhp = &cstate->current_fh;
744         return status;
745 }
746
747 static __be32
748 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
749               struct nfsd4_readdir *readdir)
750 {
751         u64 cookie = readdir->rd_cookie;
752         static const nfs4_verifier zeroverf;
753
754         /* no need to check permission - this will be done in nfsd_readdir() */
755
756         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
757                 return nfserr_inval;
758
759         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
760         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
761         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
762
763         if ((cookie == 1) || (cookie == 2) ||
764             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
765                 return nfserr_bad_cookie;
766
767         readdir->rd_rqstp = rqstp;
768         readdir->rd_fhp = &cstate->current_fh;
769         return nfs_ok;
770 }
771
772 static __be32
773 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
774                struct nfsd4_readlink *readlink)
775 {
776         readlink->rl_rqstp = rqstp;
777         readlink->rl_fhp = &cstate->current_fh;
778         return nfs_ok;
779 }
780
781 static __be32
782 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
783              struct nfsd4_remove *remove)
784 {
785         __be32 status;
786
787         if (locks_in_grace(SVC_NET(rqstp)))
788                 return nfserr_grace;
789         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
790                              remove->rm_name, remove->rm_namelen);
791         if (!status) {
792                 fh_unlock(&cstate->current_fh);
793                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
794         }
795         return status;
796 }
797
798 static __be32
799 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
800              struct nfsd4_rename *rename)
801 {
802         __be32 status = nfserr_nofilehandle;
803
804         if (!cstate->save_fh.fh_dentry)
805                 return status;
806         if (locks_in_grace(SVC_NET(rqstp)) &&
807                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
808                 return nfserr_grace;
809         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
810                              rename->rn_snamelen, &cstate->current_fh,
811                              rename->rn_tname, rename->rn_tnamelen);
812
813         /* the underlying filesystem returns different error's than required
814          * by NFSv4. both save_fh and current_fh have been verified.. */
815         if (status == nfserr_isdir)
816                 status = nfserr_exist;
817         else if ((status == nfserr_notdir) &&
818                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
819                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
820                 status = nfserr_exist;
821
822         if (!status) {
823                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
824                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
825         }
826         return status;
827 }
828
829 static __be32
830 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
831               struct nfsd4_secinfo *secinfo)
832 {
833         struct svc_fh resfh;
834         struct svc_export *exp;
835         struct dentry *dentry;
836         __be32 err;
837
838         fh_init(&resfh, NFS4_FHSIZE);
839         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
840         if (err)
841                 return err;
842         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
843                                     secinfo->si_name, secinfo->si_namelen,
844                                     &exp, &dentry);
845         if (err)
846                 return err;
847         if (dentry->d_inode == NULL) {
848                 exp_put(exp);
849                 err = nfserr_noent;
850         } else
851                 secinfo->si_exp = exp;
852         dput(dentry);
853         if (cstate->minorversion)
854                 /* See rfc 5661 section 2.6.3.1.1.8 */
855                 fh_put(&cstate->current_fh);
856         return err;
857 }
858
859 static __be32
860 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
861               struct nfsd4_secinfo_no_name *sin)
862 {
863         __be32 err;
864
865         switch (sin->sin_style) {
866         case NFS4_SECINFO_STYLE4_CURRENT_FH:
867                 break;
868         case NFS4_SECINFO_STYLE4_PARENT:
869                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
870                 if (err)
871                         return err;
872                 break;
873         default:
874                 return nfserr_inval;
875         }
876         exp_get(cstate->current_fh.fh_export);
877         sin->sin_exp = cstate->current_fh.fh_export;
878         fh_put(&cstate->current_fh);
879         return nfs_ok;
880 }
881
882 static __be32
883 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
884               struct nfsd4_setattr *setattr)
885 {
886         __be32 status = nfs_ok;
887         int err;
888
889         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
890                 nfs4_lock_state();
891                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
892                         &setattr->sa_stateid, WR_STATE, NULL);
893                 nfs4_unlock_state();
894                 if (status) {
895                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
896                         return status;
897                 }
898         }
899         err = fh_want_write(&cstate->current_fh);
900         if (err)
901                 return nfserrno(err);
902         status = nfs_ok;
903
904         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
905                                     nfsd_attrmask);
906         if (status)
907                 goto out;
908
909         if (setattr->sa_acl != NULL)
910                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
911                                             setattr->sa_acl);
912         if (status)
913                 goto out;
914         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
915                                 0, (time_t)0);
916 out:
917         fh_drop_write(&cstate->current_fh);
918         return status;
919 }
920
921 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
922 {
923         int i = 1;
924         int buflen = write->wr_buflen;
925
926         vec[0].iov_base = write->wr_head.iov_base;
927         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
928         buflen -= vec[0].iov_len;
929
930         while (buflen) {
931                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
932                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
933                 buflen -= vec[i].iov_len;
934                 i++;
935         }
936         return i;
937 }
938
939 static __be32
940 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
941             struct nfsd4_write *write)
942 {
943         stateid_t *stateid = &write->wr_stateid;
944         struct file *filp = NULL;
945         __be32 status = nfs_ok;
946         unsigned long cnt;
947         int nvecs;
948
949         /* no need to check permission - this will be done in nfsd_write() */
950
951         if (write->wr_offset >= OFFSET_MAX)
952                 return nfserr_inval;
953
954         nfs4_lock_state();
955         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
956                                         cstate, stateid, WR_STATE, &filp);
957         if (status) {
958                 nfs4_unlock_state();
959                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
960                 return status;
961         }
962         if (filp)
963                 get_file(filp);
964         nfs4_unlock_state();
965
966         cnt = write->wr_buflen;
967         write->wr_how_written = write->wr_stable_how;
968         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
969
970         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
971         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
972
973         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
974                              write->wr_offset, rqstp->rq_vec, nvecs,
975                              &cnt, &write->wr_how_written);
976         if (filp)
977                 fput(filp);
978
979         write->wr_bytes_written = cnt;
980
981         return status;
982 }
983
984 /* This routine never returns NFS_OK!  If there are no other errors, it
985  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
986  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
987  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
988  */
989 static __be32
990 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
991              struct nfsd4_verify *verify)
992 {
993         __be32 *buf, *p;
994         int count;
995         __be32 status;
996
997         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
998         if (status)
999                 return status;
1000
1001         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1002         if (status)
1003                 return status;
1004
1005         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1006             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1007                 return nfserr_inval;
1008         if (verify->ve_attrlen & 3)
1009                 return nfserr_inval;
1010
1011         /* count in words:
1012          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1013          */
1014         count = 4 + (verify->ve_attrlen >> 2);
1015         buf = kmalloc(count << 2, GFP_KERNEL);
1016         if (!buf)
1017                 return nfserr_jukebox;
1018
1019         p = buf;
1020         status = nfsd4_encode_fattr(&cstate->current_fh,
1021                                     cstate->current_fh.fh_export,
1022                                     cstate->current_fh.fh_dentry, &p,
1023                                     count, verify->ve_bmval,
1024                                     rqstp, 0);
1025
1026         /* this means that nfsd4_encode_fattr() ran out of space */
1027         if (status == nfserr_resource)
1028                 status = nfserr_not_same;
1029         if (status)
1030                 goto out_kfree;
1031
1032         /* skip bitmap */
1033         p = buf + 1 + ntohl(buf[0]);
1034         status = nfserr_not_same;
1035         if (ntohl(*p++) != verify->ve_attrlen)
1036                 goto out_kfree;
1037         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1038                 status = nfserr_same;
1039
1040 out_kfree:
1041         kfree(buf);
1042         return status;
1043 }
1044
1045 static __be32
1046 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1047               struct nfsd4_verify *verify)
1048 {
1049         __be32 status;
1050
1051         status = _nfsd4_verify(rqstp, cstate, verify);
1052         return status == nfserr_not_same ? nfs_ok : status;
1053 }
1054
1055 static __be32
1056 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1057              struct nfsd4_verify *verify)
1058 {
1059         __be32 status;
1060
1061         status = _nfsd4_verify(rqstp, cstate, verify);
1062         return status == nfserr_same ? nfs_ok : status;
1063 }
1064
1065 /*
1066  * NULL call.
1067  */
1068 static __be32
1069 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1070 {
1071         return nfs_ok;
1072 }
1073
1074 static inline void nfsd4_increment_op_stats(u32 opnum)
1075 {
1076         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1077                 nfsdstats.nfs4_opcount[opnum]++;
1078 }
1079
1080 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1081                               void *);
1082 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1083 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1084 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1085
1086 enum nfsd4_op_flags {
1087         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1088         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1089         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1090         /* For rfc 5661 section 2.6.3.1.1: */
1091         OP_HANDLES_WRONGSEC = 1 << 3,
1092         OP_IS_PUTFH_LIKE = 1 << 4,
1093         /*
1094          * These are the ops whose result size we estimate before
1095          * encoding, to avoid performing an op then not being able to
1096          * respond or cache a response.  This includes writes and setattrs
1097          * as well as the operations usually called "nonidempotent":
1098          */
1099         OP_MODIFIES_SOMETHING = 1 << 5,
1100         /*
1101          * Cache compounds containing these ops in the xid-based drc:
1102          * We use the DRC for compounds containing non-idempotent
1103          * operations, *except* those that are 4.1-specific (since
1104          * sessions provide their own EOS), and except for stateful
1105          * operations other than setclientid and setclientid_confirm
1106          * (since sequence numbers provide EOS for open, lock, etc in
1107          * the v4.0 case).
1108          */
1109         OP_CACHEME = 1 << 6,
1110         /*
1111          * These are ops which clear current state id.
1112          */
1113         OP_CLEAR_STATEID = 1 << 7,
1114 };
1115
1116 struct nfsd4_operation {
1117         nfsd4op_func op_func;
1118         u32 op_flags;
1119         char *op_name;
1120         /* Try to get response size before operation */
1121         nfsd4op_rsize op_rsize_bop;
1122         stateid_getter op_get_currentstateid;
1123         stateid_setter op_set_currentstateid;
1124 };
1125
1126 static struct nfsd4_operation nfsd4_ops[];
1127
1128 #ifdef NFSD_DEBUG
1129 static const char *nfsd4_op_name(unsigned opnum);
1130 #endif
1131
1132 /*
1133  * Enforce NFSv4.1 COMPOUND ordering rules:
1134  *
1135  * Also note, enforced elsewhere:
1136  *      - SEQUENCE other than as first op results in
1137  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1138  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1139  *        (Enforced in nfsd4_bind_conn_to_session().)
1140  *      - DESTROY_SESSION must be the final operation in a compound, if
1141  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1142  *        (Enforced in nfsd4_destroy_session().)
1143  */
1144 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1145 {
1146         struct nfsd4_op *op = &args->ops[0];
1147
1148         /* These ordering requirements don't apply to NFSv4.0: */
1149         if (args->minorversion == 0)
1150                 return nfs_ok;
1151         /* This is weird, but OK, not our problem: */
1152         if (args->opcnt == 0)
1153                 return nfs_ok;
1154         if (op->status == nfserr_op_illegal)
1155                 return nfs_ok;
1156         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1157                 return nfserr_op_not_in_session;
1158         if (op->opnum == OP_SEQUENCE)
1159                 return nfs_ok;
1160         if (args->opcnt != 1)
1161                 return nfserr_not_only_op;
1162         return nfs_ok;
1163 }
1164
1165 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1166 {
1167         return &nfsd4_ops[op->opnum];
1168 }
1169
1170 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1171 {
1172         return OPDESC(op)->op_flags & OP_CACHEME;
1173 }
1174
1175 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1176 {
1177         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1178         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1179         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1180         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1181         struct nfsd4_operation *thisd;
1182         struct nfsd4_operation *nextd;
1183
1184         thisd = OPDESC(this);
1185         /*
1186          * Most ops check wronsec on our own; only the putfh-like ops
1187          * have special rules.
1188          */
1189         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1190                 return false;
1191         /*
1192          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1193          * put-filehandle operation if we're not going to use the
1194          * result:
1195          */
1196         if (argp->opcnt == resp->opcnt)
1197                 return false;
1198
1199         nextd = OPDESC(next);
1200         /*
1201          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1202          * errors themselves as necessary; others should check for them
1203          * now:
1204          */
1205         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1206 }
1207
1208 /*
1209  * COMPOUND call.
1210  */
1211 static __be32
1212 nfsd4_proc_compound(struct svc_rqst *rqstp,
1213                     struct nfsd4_compoundargs *args,
1214                     struct nfsd4_compoundres *resp)
1215 {
1216         struct nfsd4_op *op;
1217         struct nfsd4_operation *opdesc;
1218         struct nfsd4_compound_state *cstate = &resp->cstate;
1219         int             slack_bytes;
1220         u32             plen = 0;
1221         __be32          status;
1222
1223         resp->xbuf = &rqstp->rq_res;
1224         resp->p = rqstp->rq_res.head[0].iov_base +
1225                                                 rqstp->rq_res.head[0].iov_len;
1226         resp->tagp = resp->p;
1227         /* reserve space for: taglen, tag, and opcnt */
1228         resp->p += 2 + XDR_QUADLEN(args->taglen);
1229         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1230         resp->taglen = args->taglen;
1231         resp->tag = args->tag;
1232         resp->opcnt = 0;
1233         resp->rqstp = rqstp;
1234         resp->cstate.minorversion = args->minorversion;
1235         resp->cstate.replay_owner = NULL;
1236         resp->cstate.session = NULL;
1237         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1238         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1239         /*
1240          * Don't use the deferral mechanism for NFSv4; compounds make it
1241          * too hard to avoid non-idempotency problems.
1242          */
1243         rqstp->rq_usedeferral = 0;
1244
1245         /*
1246          * According to RFC3010, this takes precedence over all other errors.
1247          */
1248         status = nfserr_minor_vers_mismatch;
1249         if (args->minorversion > nfsd_supported_minorversion)
1250                 goto out;
1251
1252         status = nfs41_check_op_ordering(args);
1253         if (status) {
1254                 op = &args->ops[0];
1255                 op->status = status;
1256                 goto encode_op;
1257         }
1258
1259         while (!status && resp->opcnt < args->opcnt) {
1260                 op = &args->ops[resp->opcnt++];
1261
1262                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1263                         resp->opcnt, args->opcnt, op->opnum,
1264                         nfsd4_op_name(op->opnum));
1265                 /*
1266                  * The XDR decode routines may have pre-set op->status;
1267                  * for example, if there is a miscellaneous XDR error
1268                  * it will be set to nfserr_bad_xdr.
1269                  */
1270                 if (op->status) {
1271                         if (op->opnum == OP_OPEN)
1272                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1273                         goto encode_op;
1274                 }
1275
1276                 /* We must be able to encode a successful response to
1277                  * this operation, with enough room left over to encode a
1278                  * failed response to the next operation.  If we don't
1279                  * have enough room, fail with ERR_RESOURCE.
1280                  */
1281                 slack_bytes = (char *)resp->end - (char *)resp->p;
1282                 if (slack_bytes < COMPOUND_SLACK_SPACE
1283                                 + COMPOUND_ERR_SLACK_SPACE) {
1284                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1285                         op->status = nfserr_resource;
1286                         goto encode_op;
1287                 }
1288
1289                 opdesc = OPDESC(op);
1290
1291                 if (!cstate->current_fh.fh_dentry) {
1292                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1293                                 op->status = nfserr_nofilehandle;
1294                                 goto encode_op;
1295                         }
1296                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1297                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1298                         op->status = nfserr_moved;
1299                         goto encode_op;
1300                 }
1301
1302                 /* If op is non-idempotent */
1303                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1304                         plen = opdesc->op_rsize_bop(rqstp, op);
1305                         op->status = nfsd4_check_resp_size(resp, plen);
1306                 }
1307
1308                 if (op->status)
1309                         goto encode_op;
1310
1311                 if (opdesc->op_get_currentstateid)
1312                         opdesc->op_get_currentstateid(cstate, &op->u);
1313                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1314
1315                 if (!op->status) {
1316                         if (opdesc->op_set_currentstateid)
1317                                 opdesc->op_set_currentstateid(cstate, &op->u);
1318
1319                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1320                                 clear_current_stateid(cstate);
1321
1322                         if (need_wrongsec_check(rqstp))
1323                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1324                 }
1325
1326 encode_op:
1327                 /* Only from SEQUENCE */
1328                 if (resp->cstate.status == nfserr_replay_cache) {
1329                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1330                         status = op->status;
1331                         goto out;
1332                 }
1333                 if (op->status == nfserr_replay_me) {
1334                         op->replay = &cstate->replay_owner->so_replay;
1335                         nfsd4_encode_replay(resp, op);
1336                         status = op->status = op->replay->rp_status;
1337                 } else {
1338                         nfsd4_encode_operation(resp, op);
1339                         status = op->status;
1340                 }
1341
1342                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1343                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1344                         be32_to_cpu(status));
1345
1346                 if (cstate->replay_owner) {
1347                         nfs4_unlock_state();
1348                         cstate->replay_owner = NULL;
1349                 }
1350                 /* XXX Ugh, we need to get rid of this kind of special case: */
1351                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1352                         fput(op->u.read.rd_filp);
1353
1354                 nfsd4_increment_op_stats(op->opnum);
1355         }
1356
1357         resp->cstate.status = status;
1358         fh_put(&resp->cstate.current_fh);
1359         fh_put(&resp->cstate.save_fh);
1360         BUG_ON(resp->cstate.replay_owner);
1361 out:
1362         /* Reset deferral mechanism for RPC deferrals */
1363         rqstp->rq_usedeferral = 1;
1364         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1365         return status;
1366 }
1367
1368 #define op_encode_hdr_size              (2)
1369 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1370 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1371 #define op_encode_change_info_maxsz     (5)
1372 #define nfs4_fattr_bitmap_maxsz         (4)
1373
1374 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1375 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1376
1377 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1378
1379 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1380 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1381                                          op_encode_ace_maxsz)
1382
1383 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1384
1385 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1386 {
1387         return (op_encode_hdr_size) * sizeof(__be32);
1388 }
1389
1390 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1391 {
1392         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1393 }
1394
1395 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1396 {
1397         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1398 }
1399
1400 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1401 {
1402         return (op_encode_hdr_size + op_encode_change_info_maxsz
1403                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1404 }
1405
1406 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1407 {
1408         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1409                 * sizeof(__be32);
1410 }
1411
1412 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1413 {
1414         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1415                 * sizeof(__be32);
1416 }
1417
1418 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1419 {
1420         return (op_encode_hdr_size + op_encode_stateid_maxsz
1421                 + op_encode_change_info_maxsz + 1
1422                 + nfs4_fattr_bitmap_maxsz
1423                 + op_encode_delegation_maxsz) * sizeof(__be32);
1424 }
1425
1426 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1427 {
1428         u32 maxcount = 0, rlen = 0;
1429
1430         maxcount = svc_max_payload(rqstp);
1431         rlen = op->u.read.rd_length;
1432
1433         if (rlen > maxcount)
1434                 rlen = maxcount;
1435
1436         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1437 }
1438
1439 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1440 {
1441         u32 rlen = op->u.readdir.rd_maxcount;
1442
1443         if (rlen > PAGE_SIZE)
1444                 rlen = PAGE_SIZE;
1445
1446         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1447                  * sizeof(__be32) + rlen;
1448 }
1449
1450 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1451 {
1452         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1453                 * sizeof(__be32);
1454 }
1455
1456 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1457 {
1458         return (op_encode_hdr_size + op_encode_change_info_maxsz
1459                 + op_encode_change_info_maxsz) * sizeof(__be32);
1460 }
1461
1462 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1463 {
1464         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1465 }
1466
1467 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1468 {
1469         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1470 }
1471
1472 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1473 {
1474         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1475 }
1476
1477 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1478 {
1479         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1480                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1481                 2 + /*eir_server_owner.so_minor_id */\
1482                 /* eir_server_owner.so_major_id<> */\
1483                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1484                 /* eir_server_scope<> */\
1485                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1486                 1 + /* eir_server_impl_id array length */\
1487                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1488 }
1489
1490 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1491 {
1492         return (op_encode_hdr_size + \
1493                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1494                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1495 }
1496
1497 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1498 {
1499         return (op_encode_hdr_size + \
1500                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1501                 2 + /* csr_sequence, csr_flags */\
1502                 op_encode_channel_attrs_maxsz + \
1503                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1504 }
1505
1506 static struct nfsd4_operation nfsd4_ops[] = {
1507         [OP_ACCESS] = {
1508                 .op_func = (nfsd4op_func)nfsd4_access,
1509                 .op_name = "OP_ACCESS",
1510         },
1511         [OP_CLOSE] = {
1512                 .op_func = (nfsd4op_func)nfsd4_close,
1513                 .op_flags = OP_MODIFIES_SOMETHING,
1514                 .op_name = "OP_CLOSE",
1515                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1516                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1517                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1518         },
1519         [OP_COMMIT] = {
1520                 .op_func = (nfsd4op_func)nfsd4_commit,
1521                 .op_flags = OP_MODIFIES_SOMETHING,
1522                 .op_name = "OP_COMMIT",
1523                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1524         },
1525         [OP_CREATE] = {
1526                 .op_func = (nfsd4op_func)nfsd4_create,
1527                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1528                 .op_name = "OP_CREATE",
1529                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1530         },
1531         [OP_DELEGRETURN] = {
1532                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1533                 .op_flags = OP_MODIFIES_SOMETHING,
1534                 .op_name = "OP_DELEGRETURN",
1535                 .op_rsize_bop = nfsd4_only_status_rsize,
1536                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1537         },
1538         [OP_GETATTR] = {
1539                 .op_func = (nfsd4op_func)nfsd4_getattr,
1540                 .op_flags = ALLOWED_ON_ABSENT_FS,
1541                 .op_name = "OP_GETATTR",
1542         },
1543         [OP_GETFH] = {
1544                 .op_func = (nfsd4op_func)nfsd4_getfh,
1545                 .op_name = "OP_GETFH",
1546         },
1547         [OP_LINK] = {
1548                 .op_func = (nfsd4op_func)nfsd4_link,
1549                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1550                                 | OP_CACHEME,
1551                 .op_name = "OP_LINK",
1552                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1553         },
1554         [OP_LOCK] = {
1555                 .op_func = (nfsd4op_func)nfsd4_lock,
1556                 .op_flags = OP_MODIFIES_SOMETHING,
1557                 .op_name = "OP_LOCK",
1558                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1559                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1560         },
1561         [OP_LOCKT] = {
1562                 .op_func = (nfsd4op_func)nfsd4_lockt,
1563                 .op_name = "OP_LOCKT",
1564         },
1565         [OP_LOCKU] = {
1566                 .op_func = (nfsd4op_func)nfsd4_locku,
1567                 .op_flags = OP_MODIFIES_SOMETHING,
1568                 .op_name = "OP_LOCKU",
1569                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1570                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1571         },
1572         [OP_LOOKUP] = {
1573                 .op_func = (nfsd4op_func)nfsd4_lookup,
1574                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1575                 .op_name = "OP_LOOKUP",
1576         },
1577         [OP_LOOKUPP] = {
1578                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1579                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1580                 .op_name = "OP_LOOKUPP",
1581         },
1582         [OP_NVERIFY] = {
1583                 .op_func = (nfsd4op_func)nfsd4_nverify,
1584                 .op_name = "OP_NVERIFY",
1585         },
1586         [OP_OPEN] = {
1587                 .op_func = (nfsd4op_func)nfsd4_open,
1588                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1589                 .op_name = "OP_OPEN",
1590                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1591                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1592         },
1593         [OP_OPEN_CONFIRM] = {
1594                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1595                 .op_flags = OP_MODIFIES_SOMETHING,
1596                 .op_name = "OP_OPEN_CONFIRM",
1597                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1598         },
1599         [OP_OPEN_DOWNGRADE] = {
1600                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1601                 .op_flags = OP_MODIFIES_SOMETHING,
1602                 .op_name = "OP_OPEN_DOWNGRADE",
1603                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1604                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1605                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1606         },
1607         [OP_PUTFH] = {
1608                 .op_func = (nfsd4op_func)nfsd4_putfh,
1609                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1610                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1611                                 | OP_CLEAR_STATEID,
1612                 .op_name = "OP_PUTFH",
1613                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1614         },
1615         [OP_PUTPUBFH] = {
1616                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1617                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1618                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1619                                 | OP_CLEAR_STATEID,
1620                 .op_name = "OP_PUTPUBFH",
1621                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1622         },
1623         [OP_PUTROOTFH] = {
1624                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1625                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1626                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1627                                 | OP_CLEAR_STATEID,
1628                 .op_name = "OP_PUTROOTFH",
1629                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1630         },
1631         [OP_READ] = {
1632                 .op_func = (nfsd4op_func)nfsd4_read,
1633                 .op_flags = OP_MODIFIES_SOMETHING,
1634                 .op_name = "OP_READ",
1635                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1636                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1637         },
1638         [OP_READDIR] = {
1639                 .op_func = (nfsd4op_func)nfsd4_readdir,
1640                 .op_flags = OP_MODIFIES_SOMETHING,
1641                 .op_name = "OP_READDIR",
1642                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1643         },
1644         [OP_READLINK] = {
1645                 .op_func = (nfsd4op_func)nfsd4_readlink,
1646                 .op_name = "OP_READLINK",
1647         },
1648         [OP_REMOVE] = {
1649                 .op_func = (nfsd4op_func)nfsd4_remove,
1650                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1651                 .op_name = "OP_REMOVE",
1652                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1653         },
1654         [OP_RENAME] = {
1655                 .op_func = (nfsd4op_func)nfsd4_rename,
1656                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1657                 .op_name = "OP_RENAME",
1658                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1659         },
1660         [OP_RENEW] = {
1661                 .op_func = (nfsd4op_func)nfsd4_renew,
1662                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1663                                 | OP_MODIFIES_SOMETHING,
1664                 .op_name = "OP_RENEW",
1665                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1666
1667         },
1668         [OP_RESTOREFH] = {
1669                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1670                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1671                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1672                 .op_name = "OP_RESTOREFH",
1673                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1674         },
1675         [OP_SAVEFH] = {
1676                 .op_func = (nfsd4op_func)nfsd4_savefh,
1677                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1678                 .op_name = "OP_SAVEFH",
1679                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1680         },
1681         [OP_SECINFO] = {
1682                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1683                 .op_flags = OP_HANDLES_WRONGSEC,
1684                 .op_name = "OP_SECINFO",
1685         },
1686         [OP_SETATTR] = {
1687                 .op_func = (nfsd4op_func)nfsd4_setattr,
1688                 .op_name = "OP_SETATTR",
1689                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1690                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1691                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1692         },
1693         [OP_SETCLIENTID] = {
1694                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1695                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1696                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1697                 .op_name = "OP_SETCLIENTID",
1698                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1699         },
1700         [OP_SETCLIENTID_CONFIRM] = {
1701                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1702                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1703                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1704                 .op_name = "OP_SETCLIENTID_CONFIRM",
1705                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1706         },
1707         [OP_VERIFY] = {
1708                 .op_func = (nfsd4op_func)nfsd4_verify,
1709                 .op_name = "OP_VERIFY",
1710         },
1711         [OP_WRITE] = {
1712                 .op_func = (nfsd4op_func)nfsd4_write,
1713                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1714                 .op_name = "OP_WRITE",
1715                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1716                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1717         },
1718         [OP_RELEASE_LOCKOWNER] = {
1719                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1720                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1721                                 | OP_MODIFIES_SOMETHING,
1722                 .op_name = "OP_RELEASE_LOCKOWNER",
1723                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1724         },
1725
1726         /* NFSv4.1 operations */
1727         [OP_EXCHANGE_ID] = {
1728                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1729                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1730                                 | OP_MODIFIES_SOMETHING,
1731                 .op_name = "OP_EXCHANGE_ID",
1732                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1733         },
1734         [OP_BACKCHANNEL_CTL] = {
1735                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1736                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1737                 .op_name = "OP_BACKCHANNEL_CTL",
1738                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1739         },
1740         [OP_BIND_CONN_TO_SESSION] = {
1741                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1742                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1743                                 | OP_MODIFIES_SOMETHING,
1744                 .op_name = "OP_BIND_CONN_TO_SESSION",
1745                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1746         },
1747         [OP_CREATE_SESSION] = {
1748                 .op_func = (nfsd4op_func)nfsd4_create_session,
1749                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1750                                 | OP_MODIFIES_SOMETHING,
1751                 .op_name = "OP_CREATE_SESSION",
1752                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1753         },
1754         [OP_DESTROY_SESSION] = {
1755                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1756                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1757                                 | OP_MODIFIES_SOMETHING,
1758                 .op_name = "OP_DESTROY_SESSION",
1759                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1760         },
1761         [OP_SEQUENCE] = {
1762                 .op_func = (nfsd4op_func)nfsd4_sequence,
1763                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1764                 .op_name = "OP_SEQUENCE",
1765         },
1766         [OP_DESTROY_CLIENTID] = {
1767                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1768                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1769                                 | OP_MODIFIES_SOMETHING,
1770                 .op_name = "OP_DESTROY_CLIENTID",
1771                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1772         },
1773         [OP_RECLAIM_COMPLETE] = {
1774                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1775                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1776                 .op_name = "OP_RECLAIM_COMPLETE",
1777                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1778         },
1779         [OP_SECINFO_NO_NAME] = {
1780                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1781                 .op_flags = OP_HANDLES_WRONGSEC,
1782                 .op_name = "OP_SECINFO_NO_NAME",
1783         },
1784         [OP_TEST_STATEID] = {
1785                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1786                 .op_flags = ALLOWED_WITHOUT_FH,
1787                 .op_name = "OP_TEST_STATEID",
1788         },
1789         [OP_FREE_STATEID] = {
1790                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1791                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1792                 .op_name = "OP_FREE_STATEID",
1793                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1794                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1795         },
1796 };
1797
1798 #ifdef NFSD_DEBUG
1799 static const char *nfsd4_op_name(unsigned opnum)
1800 {
1801         if (opnum < ARRAY_SIZE(nfsd4_ops))
1802                 return nfsd4_ops[opnum].op_name;
1803         return "unknown_operation";
1804 }
1805 #endif
1806
1807 #define nfsd4_voidres                   nfsd4_voidargs
1808 struct nfsd4_voidargs { int dummy; };
1809
1810 static struct svc_procedure             nfsd_procedures4[2] = {
1811         [NFSPROC4_NULL] = {
1812                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1813                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1814                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1815                 .pc_ressize = sizeof(struct nfsd4_voidres),
1816                 .pc_cachetype = RC_NOCACHE,
1817                 .pc_xdrressize = 1,
1818         },
1819         [NFSPROC4_COMPOUND] = {
1820                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1821                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1822                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1823                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1824                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1825                 .pc_release = nfsd4_release_compoundargs,
1826                 .pc_cachetype = RC_NOCACHE,
1827                 .pc_xdrressize = NFSD_BUFSIZE/4,
1828         },
1829 };
1830
1831 struct svc_version      nfsd_version4 = {
1832                 .vs_vers        = 4,
1833                 .vs_nproc       = 2,
1834                 .vs_proc        = nfsd_procedures4,
1835                 .vs_dispatch    = nfsd_dispatch,
1836                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1837 };
1838
1839 /*
1840  * Local variables:
1841  *  c-basic-offset: 8
1842  * End:
1843  */