Merge branch 'for-2.6.31' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[linux-2.6.git] / fs / nfsd / nfs4proc.c
1 /*
2  *  fs/nfsd/nfs4proc.c
3  *
4  *  Server-side procedures for NFSv4.
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *  Andy Adamson   <andros@umich.edu>
11  *
12  *  Redistribution and use in source and binary forms, with or without
13  *  modification, are permitted provided that the following conditions
14  *  are met:
15  *
16  *  1. Redistributions of source code must retain the above copyright
17  *     notice, this list of conditions and the following disclaimer.
18  *  2. Redistributions in binary form must reproduce the above copyright
19  *     notice, this list of conditions and the following disclaimer in the
20  *     documentation and/or other materials provided with the distribution.
21  *  3. Neither the name of the University nor the names of its
22  *     contributors may be used to endorse or promote products derived
23  *     from this software without specific prior written permission.
24  *
25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37
38 #include <linux/param.h>
39 #include <linux/major.h>
40 #include <linux/slab.h>
41 #include <linux/file.h>
42
43 #include <linux/sunrpc/svc.h>
44 #include <linux/nfsd/nfsd.h>
45 #include <linux/nfsd/cache.h>
46 #include <linux/nfs4.h>
47 #include <linux/nfsd/state.h>
48 #include <linux/nfsd/xdr4.h>
49 #include <linux/nfs4_acl.h>
50 #include <linux/sunrpc/gss_api.h>
51
52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
53
54 static inline void
55 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
56 {
57         fh_put(dst);
58         dget(src->fh_dentry);
59         if (src->fh_export)
60                 cache_get(&src->fh_export->h);
61         *dst = *src;
62 }
63
64 static __be32
65 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
66 {
67         __be32 status;
68
69         if (open->op_truncate &&
70                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
71                 return nfserr_inval;
72
73         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
74                 accmode |= NFSD_MAY_READ;
75         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
76                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
77         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
78                 accmode |= NFSD_MAY_WRITE;
79
80         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
81
82         return status;
83 }
84
85 static __be32
86 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
87 {
88         struct svc_fh resfh;
89         __be32 status;
90         int created = 0;
91
92         fh_init(&resfh, NFS4_FHSIZE);
93         open->op_truncate = 0;
94
95         if (open->op_create) {
96                 /* FIXME: check session persistence and pnfs flags.
97                  * The nfsv4.1 spec requires the following semantics:
98                  *
99                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
100                  * Reply Cache  | server |                 |
101                  * -------------+--------+-----------------+--------------------
102                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
103                  *              |        |                 | (SHOULD)
104                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
105                  *              |        |                 | (SHOULD NOT)
106                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
107                  * yes          | no     | GUARDED4        | GUARDED4
108                  * yes          | yes    | GUARDED4        | GUARDED4
109                  */
110
111                 /*
112                  * Note: create modes (UNCHECKED,GUARDED...) are the same
113                  * in NFSv4 as in v3.
114                  */
115                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
116                                         open->op_fname.len, &open->op_iattr,
117                                         &resfh, open->op_createmode,
118                                         (u32 *)open->op_verf.data,
119                                         &open->op_truncate, &created);
120
121                 /*
122                  * Following rfc 3530 14.2.16, use the returned bitmask
123                  * to indicate which attributes we used to store the
124                  * verifier:
125                  */
126                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
127                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
128                                                 FATTR4_WORD1_TIME_MODIFY);
129         } else {
130                 status = nfsd_lookup(rqstp, current_fh,
131                                      open->op_fname.data, open->op_fname.len, &resfh);
132                 fh_unlock(current_fh);
133         }
134         if (status)
135                 goto out;
136
137         set_change_info(&open->op_cinfo, current_fh);
138         fh_dup2(current_fh, &resfh);
139
140         /* set reply cache */
141         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
142                         &resfh.fh_handle);
143         if (!created)
144                 status = do_open_permission(rqstp, current_fh, open,
145                                             NFSD_MAY_NOP);
146
147 out:
148         fh_put(&resfh);
149         return status;
150 }
151
152 static __be32
153 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
154 {
155         __be32 status;
156
157         /* Only reclaims from previously confirmed clients are valid */
158         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
159                 return status;
160
161         /* We don't know the target directory, and therefore can not
162         * set the change info
163         */
164
165         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
166
167         /* set replay cache */
168         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
169                         &current_fh->fh_handle);
170
171         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
172                 (open->op_iattr.ia_size == 0);
173
174         status = do_open_permission(rqstp, current_fh, open,
175                                     NFSD_MAY_OWNER_OVERRIDE);
176
177         return status;
178 }
179
180 static void
181 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
182 {
183         struct nfsd4_sessionid *sid =
184                         (struct nfsd4_sessionid *)session->se_sessionid.data;
185
186         clid->cl_boot = sid->clientid.cl_boot;
187         clid->cl_id = sid->clientid.cl_id;
188 }
189
190 static __be32
191 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
192            struct nfsd4_open *open)
193 {
194         __be32 status;
195         struct nfsd4_compoundres *resp;
196
197         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
198                 (int)open->op_fname.len, open->op_fname.data,
199                 open->op_stateowner);
200
201         /* This check required by spec. */
202         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
203                 return nfserr_inval;
204
205         if (nfsd4_has_session(cstate))
206                 copy_clientid(&open->op_clientid, cstate->session);
207
208         nfs4_lock_state();
209
210         /* check seqid for replay. set nfs4_owner */
211         resp = rqstp->rq_resp;
212         status = nfsd4_process_open1(&resp->cstate, open);
213         if (status == nfserr_replay_me) {
214                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
215                 fh_put(&cstate->current_fh);
216                 fh_copy_shallow(&cstate->current_fh.fh_handle,
217                                 &rp->rp_openfh);
218                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
219                 if (status)
220                         dprintk("nfsd4_open: replay failed"
221                                 " restoring previous filehandle\n");
222                 else
223                         status = nfserr_replay_me;
224         }
225         if (status)
226                 goto out;
227
228         /* Openowner is now set, so sequence id will get bumped.  Now we need
229          * these checks before we do any creates: */
230         status = nfserr_grace;
231         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
232                 goto out;
233         status = nfserr_no_grace;
234         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
235                 goto out;
236
237         switch (open->op_claim_type) {
238                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
239                 case NFS4_OPEN_CLAIM_NULL:
240                         /*
241                          * (1) set CURRENT_FH to the file being opened,
242                          * creating it if necessary, (2) set open->op_cinfo,
243                          * (3) set open->op_truncate if the file is to be
244                          * truncated after opening, (4) do permission checking.
245                          */
246                         status = do_open_lookup(rqstp, &cstate->current_fh,
247                                                 open);
248                         if (status)
249                                 goto out;
250                         break;
251                 case NFS4_OPEN_CLAIM_PREVIOUS:
252                         open->op_stateowner->so_confirmed = 1;
253                         /*
254                          * The CURRENT_FH is already set to the file being
255                          * opened.  (1) set open->op_cinfo, (2) set
256                          * open->op_truncate if the file is to be truncated
257                          * after opening, (3) do permission checking.
258                         */
259                         status = do_open_fhandle(rqstp, &cstate->current_fh,
260                                                  open);
261                         if (status)
262                                 goto out;
263                         break;
264                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
265                         open->op_stateowner->so_confirmed = 1;
266                         dprintk("NFSD: unsupported OPEN claim type %d\n",
267                                 open->op_claim_type);
268                         status = nfserr_notsupp;
269                         goto out;
270                 default:
271                         dprintk("NFSD: Invalid OPEN claim type %d\n",
272                                 open->op_claim_type);
273                         status = nfserr_inval;
274                         goto out;
275         }
276         /*
277          * nfsd4_process_open2() does the actual opening of the file.  If
278          * successful, it (1) truncates the file if open->op_truncate was
279          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
280          */
281         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
282 out:
283         if (open->op_stateowner) {
284                 nfs4_get_stateowner(open->op_stateowner);
285                 cstate->replay_owner = open->op_stateowner;
286         }
287         nfs4_unlock_state();
288         return status;
289 }
290
291 /*
292  * filehandle-manipulating ops.
293  */
294 static __be32
295 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
296             struct svc_fh **getfh)
297 {
298         if (!cstate->current_fh.fh_dentry)
299                 return nfserr_nofilehandle;
300
301         *getfh = &cstate->current_fh;
302         return nfs_ok;
303 }
304
305 static __be32
306 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
307             struct nfsd4_putfh *putfh)
308 {
309         fh_put(&cstate->current_fh);
310         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
311         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
312                putfh->pf_fhlen);
313         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
314 }
315
316 static __be32
317 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
318                 void *arg)
319 {
320         __be32 status;
321
322         fh_put(&cstate->current_fh);
323         status = exp_pseudoroot(rqstp, &cstate->current_fh);
324         return status;
325 }
326
327 static __be32
328 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
329                 void *arg)
330 {
331         if (!cstate->save_fh.fh_dentry)
332                 return nfserr_restorefh;
333
334         fh_dup2(&cstate->current_fh, &cstate->save_fh);
335         return nfs_ok;
336 }
337
338 static __be32
339 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
340              void *arg)
341 {
342         if (!cstate->current_fh.fh_dentry)
343                 return nfserr_nofilehandle;
344
345         fh_dup2(&cstate->save_fh, &cstate->current_fh);
346         return nfs_ok;
347 }
348
349 /*
350  * misc nfsv4 ops
351  */
352 static __be32
353 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
354              struct nfsd4_access *access)
355 {
356         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
357                 return nfserr_inval;
358
359         access->ac_resp_access = access->ac_req_access;
360         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
361                            &access->ac_supported);
362 }
363
364 static __be32
365 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
366              struct nfsd4_commit *commit)
367 {
368         __be32 status;
369
370         u32 *p = (u32 *)commit->co_verf.data;
371         *p++ = nfssvc_boot.tv_sec;
372         *p++ = nfssvc_boot.tv_usec;
373
374         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
375                              commit->co_count);
376         if (status == nfserr_symlink)
377                 status = nfserr_inval;
378         return status;
379 }
380
381 static __be32
382 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
383              struct nfsd4_create *create)
384 {
385         struct svc_fh resfh;
386         __be32 status;
387         dev_t rdev;
388
389         fh_init(&resfh, NFS4_FHSIZE);
390
391         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
392                            NFSD_MAY_CREATE);
393         if (status == nfserr_symlink)
394                 status = nfserr_notdir;
395         if (status)
396                 return status;
397
398         switch (create->cr_type) {
399         case NF4LNK:
400                 /* ugh! we have to null-terminate the linktext, or
401                  * vfs_symlink() will choke.  it is always safe to
402                  * null-terminate by brute force, since at worst we
403                  * will overwrite the first byte of the create namelen
404                  * in the XDR buffer, which has already been extracted
405                  * during XDR decode.
406                  */
407                 create->cr_linkname[create->cr_linklen] = 0;
408
409                 status = nfsd_symlink(rqstp, &cstate->current_fh,
410                                       create->cr_name, create->cr_namelen,
411                                       create->cr_linkname, create->cr_linklen,
412                                       &resfh, &create->cr_iattr);
413                 break;
414
415         case NF4BLK:
416                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
417                 if (MAJOR(rdev) != create->cr_specdata1 ||
418                     MINOR(rdev) != create->cr_specdata2)
419                         return nfserr_inval;
420                 status = nfsd_create(rqstp, &cstate->current_fh,
421                                      create->cr_name, create->cr_namelen,
422                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
423                 break;
424
425         case NF4CHR:
426                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
427                 if (MAJOR(rdev) != create->cr_specdata1 ||
428                     MINOR(rdev) != create->cr_specdata2)
429                         return nfserr_inval;
430                 status = nfsd_create(rqstp, &cstate->current_fh,
431                                      create->cr_name, create->cr_namelen,
432                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
433                 break;
434
435         case NF4SOCK:
436                 status = nfsd_create(rqstp, &cstate->current_fh,
437                                      create->cr_name, create->cr_namelen,
438                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
439                 break;
440
441         case NF4FIFO:
442                 status = nfsd_create(rqstp, &cstate->current_fh,
443                                      create->cr_name, create->cr_namelen,
444                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
445                 break;
446
447         case NF4DIR:
448                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
449                 status = nfsd_create(rqstp, &cstate->current_fh,
450                                      create->cr_name, create->cr_namelen,
451                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
452                 break;
453
454         default:
455                 status = nfserr_badtype;
456         }
457
458         if (!status) {
459                 fh_unlock(&cstate->current_fh);
460                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
461                 fh_dup2(&cstate->current_fh, &resfh);
462         }
463
464         fh_put(&resfh);
465         return status;
466 }
467
468 static __be32
469 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
470               struct nfsd4_getattr *getattr)
471 {
472         __be32 status;
473
474         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
475         if (status)
476                 return status;
477
478         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
479                 return nfserr_inval;
480
481         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
482         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
483         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
484
485         getattr->ga_fhp = &cstate->current_fh;
486         return nfs_ok;
487 }
488
489 static __be32
490 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
491            struct nfsd4_link *link)
492 {
493         __be32 status = nfserr_nofilehandle;
494
495         if (!cstate->save_fh.fh_dentry)
496                 return status;
497         status = nfsd_link(rqstp, &cstate->current_fh,
498                            link->li_name, link->li_namelen, &cstate->save_fh);
499         if (!status)
500                 set_change_info(&link->li_cinfo, &cstate->current_fh);
501         return status;
502 }
503
504 static __be32
505 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
506               void *arg)
507 {
508         struct svc_fh tmp_fh;
509         __be32 ret;
510
511         fh_init(&tmp_fh, NFS4_FHSIZE);
512         ret = exp_pseudoroot(rqstp, &tmp_fh);
513         if (ret)
514                 return ret;
515         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
516                 fh_put(&tmp_fh);
517                 return nfserr_noent;
518         }
519         fh_put(&tmp_fh);
520         return nfsd_lookup(rqstp, &cstate->current_fh,
521                            "..", 2, &cstate->current_fh);
522 }
523
524 static __be32
525 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
526              struct nfsd4_lookup *lookup)
527 {
528         return nfsd_lookup(rqstp, &cstate->current_fh,
529                            lookup->lo_name, lookup->lo_len,
530                            &cstate->current_fh);
531 }
532
533 static __be32
534 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
535            struct nfsd4_read *read)
536 {
537         __be32 status;
538
539         /* no need to check permission - this will be done in nfsd_read() */
540
541         read->rd_filp = NULL;
542         if (read->rd_offset >= OFFSET_MAX)
543                 return nfserr_inval;
544
545         nfs4_lock_state();
546         /* check stateid */
547         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
548                                                  RD_STATE, &read->rd_filp))) {
549                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
550                 goto out;
551         }
552         if (read->rd_filp)
553                 get_file(read->rd_filp);
554         status = nfs_ok;
555 out:
556         nfs4_unlock_state();
557         read->rd_rqstp = rqstp;
558         read->rd_fhp = &cstate->current_fh;
559         return status;
560 }
561
562 static __be32
563 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
564               struct nfsd4_readdir *readdir)
565 {
566         u64 cookie = readdir->rd_cookie;
567         static const nfs4_verifier zeroverf;
568
569         /* no need to check permission - this will be done in nfsd_readdir() */
570
571         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
572                 return nfserr_inval;
573
574         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
575         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
576         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
577
578         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
579             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
580                 return nfserr_bad_cookie;
581
582         readdir->rd_rqstp = rqstp;
583         readdir->rd_fhp = &cstate->current_fh;
584         return nfs_ok;
585 }
586
587 static __be32
588 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
589                struct nfsd4_readlink *readlink)
590 {
591         readlink->rl_rqstp = rqstp;
592         readlink->rl_fhp = &cstate->current_fh;
593         return nfs_ok;
594 }
595
596 static __be32
597 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
598              struct nfsd4_remove *remove)
599 {
600         __be32 status;
601
602         if (locks_in_grace())
603                 return nfserr_grace;
604         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
605                              remove->rm_name, remove->rm_namelen);
606         if (status == nfserr_symlink)
607                 return nfserr_notdir;
608         if (!status) {
609                 fh_unlock(&cstate->current_fh);
610                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
611         }
612         return status;
613 }
614
615 static __be32
616 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
617              struct nfsd4_rename *rename)
618 {
619         __be32 status = nfserr_nofilehandle;
620
621         if (!cstate->save_fh.fh_dentry)
622                 return status;
623         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
624                                         & NFSEXP_NOSUBTREECHECK))
625                 return nfserr_grace;
626         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
627                              rename->rn_snamelen, &cstate->current_fh,
628                              rename->rn_tname, rename->rn_tnamelen);
629
630         /* the underlying filesystem returns different error's than required
631          * by NFSv4. both save_fh and current_fh have been verified.. */
632         if (status == nfserr_isdir)
633                 status = nfserr_exist;
634         else if ((status == nfserr_notdir) &&
635                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
636                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
637                 status = nfserr_exist;
638         else if (status == nfserr_symlink)
639                 status = nfserr_notdir;
640
641         if (!status) {
642                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
643                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
644         }
645         return status;
646 }
647
648 static __be32
649 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
650               struct nfsd4_secinfo *secinfo)
651 {
652         struct svc_fh resfh;
653         struct svc_export *exp;
654         struct dentry *dentry;
655         __be32 err;
656
657         fh_init(&resfh, NFS4_FHSIZE);
658         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
659                                     secinfo->si_name, secinfo->si_namelen,
660                                     &exp, &dentry);
661         if (err)
662                 return err;
663         if (dentry->d_inode == NULL) {
664                 exp_put(exp);
665                 err = nfserr_noent;
666         } else
667                 secinfo->si_exp = exp;
668         dput(dentry);
669         return err;
670 }
671
672 static __be32
673 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
674               struct nfsd4_setattr *setattr)
675 {
676         __be32 status = nfs_ok;
677
678         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
679                 nfs4_lock_state();
680                 status = nfs4_preprocess_stateid_op(cstate,
681                         &setattr->sa_stateid, WR_STATE, NULL);
682                 nfs4_unlock_state();
683                 if (status) {
684                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
685                         return status;
686                 }
687         }
688         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
689         if (status)
690                 return status;
691         status = nfs_ok;
692         if (setattr->sa_acl != NULL)
693                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
694                                             setattr->sa_acl);
695         if (status)
696                 goto out;
697         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
698                                 0, (time_t)0);
699 out:
700         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
701         return status;
702 }
703
704 static __be32
705 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
706             struct nfsd4_write *write)
707 {
708         stateid_t *stateid = &write->wr_stateid;
709         struct file *filp = NULL;
710         u32 *p;
711         __be32 status = nfs_ok;
712         unsigned long cnt;
713
714         /* no need to check permission - this will be done in nfsd_write() */
715
716         if (write->wr_offset >= OFFSET_MAX)
717                 return nfserr_inval;
718
719         nfs4_lock_state();
720         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
721         if (filp)
722                 get_file(filp);
723         nfs4_unlock_state();
724
725         if (status) {
726                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
727                 return status;
728         }
729
730         cnt = write->wr_buflen;
731         write->wr_how_written = write->wr_stable_how;
732         p = (u32 *)write->wr_verifier.data;
733         *p++ = nfssvc_boot.tv_sec;
734         *p++ = nfssvc_boot.tv_usec;
735
736         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
737                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
738                              &cnt, &write->wr_how_written);
739         if (filp)
740                 fput(filp);
741
742         write->wr_bytes_written = cnt;
743
744         if (status == nfserr_symlink)
745                 status = nfserr_inval;
746         return status;
747 }
748
749 /* This routine never returns NFS_OK!  If there are no other errors, it
750  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
751  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
752  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
753  */
754 static __be32
755 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
756              struct nfsd4_verify *verify)
757 {
758         __be32 *buf, *p;
759         int count;
760         __be32 status;
761
762         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
763         if (status)
764                 return status;
765
766         if ((verify->ve_bmval[0] & ~nfsd_suppattrs0(cstate->minorversion))
767             || (verify->ve_bmval[1] & ~nfsd_suppattrs1(cstate->minorversion))
768             || (verify->ve_bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
769                 return nfserr_attrnotsupp;
770         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
771             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
772                 return nfserr_inval;
773         if (verify->ve_attrlen & 3)
774                 return nfserr_inval;
775
776         /* count in words:
777          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
778          */
779         count = 4 + (verify->ve_attrlen >> 2);
780         buf = kmalloc(count << 2, GFP_KERNEL);
781         if (!buf)
782                 return nfserr_resource;
783
784         status = nfsd4_encode_fattr(&cstate->current_fh,
785                                     cstate->current_fh.fh_export,
786                                     cstate->current_fh.fh_dentry, buf,
787                                     &count, verify->ve_bmval,
788                                     rqstp, 0);
789
790         /* this means that nfsd4_encode_fattr() ran out of space */
791         if (status == nfserr_resource && count == 0)
792                 status = nfserr_not_same;
793         if (status)
794                 goto out_kfree;
795
796         /* skip bitmap */
797         p = buf + 1 + ntohl(buf[0]);
798         status = nfserr_not_same;
799         if (ntohl(*p++) != verify->ve_attrlen)
800                 goto out_kfree;
801         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
802                 status = nfserr_same;
803
804 out_kfree:
805         kfree(buf);
806         return status;
807 }
808
809 static __be32
810 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
811               struct nfsd4_verify *verify)
812 {
813         __be32 status;
814
815         status = _nfsd4_verify(rqstp, cstate, verify);
816         return status == nfserr_not_same ? nfs_ok : status;
817 }
818
819 static __be32
820 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
821              struct nfsd4_verify *verify)
822 {
823         __be32 status;
824
825         status = _nfsd4_verify(rqstp, cstate, verify);
826         return status == nfserr_same ? nfs_ok : status;
827 }
828
829 /*
830  * NULL call.
831  */
832 static __be32
833 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
834 {
835         return nfs_ok;
836 }
837
838 static inline void nfsd4_increment_op_stats(u32 opnum)
839 {
840         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
841                 nfsdstats.nfs4_opcount[opnum]++;
842 }
843
844 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
845                               void *);
846 enum nfsd4_op_flags {
847         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
848         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
849         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
850 };
851
852 struct nfsd4_operation {
853         nfsd4op_func op_func;
854         u32 op_flags;
855         char *op_name;
856 };
857
858 static struct nfsd4_operation nfsd4_ops[];
859
860 static const char *nfsd4_op_name(unsigned opnum);
861
862 /*
863  * This is a replay of a compound for which no cache entry pages
864  * were used. Encode the sequence operation, and if cachethis is FALSE
865  * encode the uncache rep error on the next operation.
866  */
867 static __be32
868 nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
869                          struct nfsd4_compoundres *resp)
870 {
871         struct nfsd4_op *op;
872
873         dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
874                 resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
875
876         /* Encode the replayed sequence operation */
877         BUG_ON(resp->opcnt != 1);
878         op = &args->ops[resp->opcnt - 1];
879         nfsd4_encode_operation(resp, op);
880
881         /*return nfserr_retry_uncached_rep in next operation. */
882         if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
883                 op = &args->ops[resp->opcnt++];
884                 op->status = nfserr_retry_uncached_rep;
885                 nfsd4_encode_operation(resp, op);
886         }
887         return op->status;
888 }
889
890 /*
891  * Enforce NFSv4.1 COMPOUND ordering rules.
892  *
893  * TODO:
894  * - enforce NFS4ERR_NOT_ONLY_OP,
895  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
896  */
897 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
898 {
899         if (args->minorversion && args->opcnt > 0) {
900                 struct nfsd4_op *op = &args->ops[0];
901                 return (op->status == nfserr_op_illegal) ||
902                        (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
903         }
904         return true;
905 }
906
907 /*
908  * COMPOUND call.
909  */
910 static __be32
911 nfsd4_proc_compound(struct svc_rqst *rqstp,
912                     struct nfsd4_compoundargs *args,
913                     struct nfsd4_compoundres *resp)
914 {
915         struct nfsd4_op *op;
916         struct nfsd4_operation *opdesc;
917         struct nfsd4_compound_state *cstate = &resp->cstate;
918         int             slack_bytes;
919         __be32          status;
920
921         resp->xbuf = &rqstp->rq_res;
922         resp->p = rqstp->rq_res.head[0].iov_base +
923                                                 rqstp->rq_res.head[0].iov_len;
924         resp->tagp = resp->p;
925         /* reserve space for: taglen, tag, and opcnt */
926         resp->p += 2 + XDR_QUADLEN(args->taglen);
927         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
928         resp->taglen = args->taglen;
929         resp->tag = args->tag;
930         resp->opcnt = 0;
931         resp->rqstp = rqstp;
932         resp->cstate.minorversion = args->minorversion;
933         resp->cstate.replay_owner = NULL;
934         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
935         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
936         /* Use the deferral mechanism only for NFSv4.0 compounds */
937         rqstp->rq_usedeferral = (args->minorversion == 0);
938
939         /*
940          * According to RFC3010, this takes precedence over all other errors.
941          */
942         status = nfserr_minor_vers_mismatch;
943         if (args->minorversion > nfsd_supported_minorversion)
944                 goto out;
945
946         if (!nfs41_op_ordering_ok(args)) {
947                 op = &args->ops[0];
948                 op->status = nfserr_sequence_pos;
949                 goto encode_op;
950         }
951
952         status = nfs_ok;
953         while (!status && resp->opcnt < args->opcnt) {
954                 op = &args->ops[resp->opcnt++];
955
956                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
957                         resp->opcnt, args->opcnt, op->opnum,
958                         nfsd4_op_name(op->opnum));
959                 /*
960                  * The XDR decode routines may have pre-set op->status;
961                  * for example, if there is a miscellaneous XDR error
962                  * it will be set to nfserr_bad_xdr.
963                  */
964                 if (op->status)
965                         goto encode_op;
966
967                 /* We must be able to encode a successful response to
968                  * this operation, with enough room left over to encode a
969                  * failed response to the next operation.  If we don't
970                  * have enough room, fail with ERR_RESOURCE.
971                  */
972                 slack_bytes = (char *)resp->end - (char *)resp->p;
973                 if (slack_bytes < COMPOUND_SLACK_SPACE
974                                 + COMPOUND_ERR_SLACK_SPACE) {
975                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
976                         op->status = nfserr_resource;
977                         goto encode_op;
978                 }
979
980                 opdesc = &nfsd4_ops[op->opnum];
981
982                 if (!cstate->current_fh.fh_dentry) {
983                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
984                                 op->status = nfserr_nofilehandle;
985                                 goto encode_op;
986                         }
987                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
988                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
989                         op->status = nfserr_moved;
990                         goto encode_op;
991                 }
992
993                 if (opdesc->op_func)
994                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
995                 else
996                         BUG_ON(op->status == nfs_ok);
997
998 encode_op:
999                 /* Only from SEQUENCE or CREATE_SESSION */
1000                 if (resp->cstate.status == nfserr_replay_cache) {
1001                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1002                         if (nfsd4_not_cached(resp))
1003                                 status = nfsd4_enc_uncached_replay(args, resp);
1004                         else
1005                                 status = op->status;
1006                         goto out;
1007                 }
1008                 if (op->status == nfserr_replay_me) {
1009                         op->replay = &cstate->replay_owner->so_replay;
1010                         nfsd4_encode_replay(resp, op);
1011                         status = op->status = op->replay->rp_status;
1012                 } else {
1013                         nfsd4_encode_operation(resp, op);
1014                         status = op->status;
1015                 }
1016
1017                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1018                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1019                         be32_to_cpu(status));
1020
1021                 if (cstate->replay_owner) {
1022                         nfs4_put_stateowner(cstate->replay_owner);
1023                         cstate->replay_owner = NULL;
1024                 }
1025                 /* XXX Ugh, we need to get rid of this kind of special case: */
1026                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1027                         fput(op->u.read.rd_filp);
1028
1029                 nfsd4_increment_op_stats(op->opnum);
1030         }
1031         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1032                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1033                 status = nfserr_jukebox;
1034         }
1035
1036         resp->cstate.status = status;
1037         fh_put(&resp->cstate.current_fh);
1038         fh_put(&resp->cstate.save_fh);
1039         BUG_ON(resp->cstate.replay_owner);
1040 out:
1041         nfsd4_release_compoundargs(args);
1042         /* Reset deferral mechanism for RPC deferrals */
1043         rqstp->rq_usedeferral = 1;
1044         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1045         return status;
1046 }
1047
1048 static struct nfsd4_operation nfsd4_ops[] = {
1049         [OP_ACCESS] = {
1050                 .op_func = (nfsd4op_func)nfsd4_access,
1051                 .op_name = "OP_ACCESS",
1052         },
1053         [OP_CLOSE] = {
1054                 .op_func = (nfsd4op_func)nfsd4_close,
1055                 .op_name = "OP_CLOSE",
1056         },
1057         [OP_COMMIT] = {
1058                 .op_func = (nfsd4op_func)nfsd4_commit,
1059                 .op_name = "OP_COMMIT",
1060         },
1061         [OP_CREATE] = {
1062                 .op_func = (nfsd4op_func)nfsd4_create,
1063                 .op_name = "OP_CREATE",
1064         },
1065         [OP_DELEGRETURN] = {
1066                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1067                 .op_name = "OP_DELEGRETURN",
1068         },
1069         [OP_GETATTR] = {
1070                 .op_func = (nfsd4op_func)nfsd4_getattr,
1071                 .op_flags = ALLOWED_ON_ABSENT_FS,
1072                 .op_name = "OP_GETATTR",
1073         },
1074         [OP_GETFH] = {
1075                 .op_func = (nfsd4op_func)nfsd4_getfh,
1076                 .op_name = "OP_GETFH",
1077         },
1078         [OP_LINK] = {
1079                 .op_func = (nfsd4op_func)nfsd4_link,
1080                 .op_name = "OP_LINK",
1081         },
1082         [OP_LOCK] = {
1083                 .op_func = (nfsd4op_func)nfsd4_lock,
1084                 .op_name = "OP_LOCK",
1085         },
1086         [OP_LOCKT] = {
1087                 .op_func = (nfsd4op_func)nfsd4_lockt,
1088                 .op_name = "OP_LOCKT",
1089         },
1090         [OP_LOCKU] = {
1091                 .op_func = (nfsd4op_func)nfsd4_locku,
1092                 .op_name = "OP_LOCKU",
1093         },
1094         [OP_LOOKUP] = {
1095                 .op_func = (nfsd4op_func)nfsd4_lookup,
1096                 .op_name = "OP_LOOKUP",
1097         },
1098         [OP_LOOKUPP] = {
1099                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1100                 .op_name = "OP_LOOKUPP",
1101         },
1102         [OP_NVERIFY] = {
1103                 .op_func = (nfsd4op_func)nfsd4_nverify,
1104                 .op_name = "OP_NVERIFY",
1105         },
1106         [OP_OPEN] = {
1107                 .op_func = (nfsd4op_func)nfsd4_open,
1108                 .op_name = "OP_OPEN",
1109         },
1110         [OP_OPEN_CONFIRM] = {
1111                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1112                 .op_name = "OP_OPEN_CONFIRM",
1113         },
1114         [OP_OPEN_DOWNGRADE] = {
1115                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1116                 .op_name = "OP_OPEN_DOWNGRADE",
1117         },
1118         [OP_PUTFH] = {
1119                 .op_func = (nfsd4op_func)nfsd4_putfh,
1120                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1121                 .op_name = "OP_PUTFH",
1122         },
1123         [OP_PUTPUBFH] = {
1124                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1125                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1126                 .op_name = "OP_PUTPUBFH",
1127         },
1128         [OP_PUTROOTFH] = {
1129                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1130                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1131                 .op_name = "OP_PUTROOTFH",
1132         },
1133         [OP_READ] = {
1134                 .op_func = (nfsd4op_func)nfsd4_read,
1135                 .op_name = "OP_READ",
1136         },
1137         [OP_READDIR] = {
1138                 .op_func = (nfsd4op_func)nfsd4_readdir,
1139                 .op_name = "OP_READDIR",
1140         },
1141         [OP_READLINK] = {
1142                 .op_func = (nfsd4op_func)nfsd4_readlink,
1143                 .op_name = "OP_READLINK",
1144         },
1145         [OP_REMOVE] = {
1146                 .op_func = (nfsd4op_func)nfsd4_remove,
1147                 .op_name = "OP_REMOVE",
1148         },
1149         [OP_RENAME] = {
1150                 .op_name = "OP_RENAME",
1151                 .op_func = (nfsd4op_func)nfsd4_rename,
1152         },
1153         [OP_RENEW] = {
1154                 .op_func = (nfsd4op_func)nfsd4_renew,
1155                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1156                 .op_name = "OP_RENEW",
1157         },
1158         [OP_RESTOREFH] = {
1159                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1160                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1161                 .op_name = "OP_RESTOREFH",
1162         },
1163         [OP_SAVEFH] = {
1164                 .op_func = (nfsd4op_func)nfsd4_savefh,
1165                 .op_name = "OP_SAVEFH",
1166         },
1167         [OP_SECINFO] = {
1168                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1169                 .op_name = "OP_SECINFO",
1170         },
1171         [OP_SETATTR] = {
1172                 .op_func = (nfsd4op_func)nfsd4_setattr,
1173                 .op_name = "OP_SETATTR",
1174         },
1175         [OP_SETCLIENTID] = {
1176                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1177                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1178                 .op_name = "OP_SETCLIENTID",
1179         },
1180         [OP_SETCLIENTID_CONFIRM] = {
1181                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1182                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1183                 .op_name = "OP_SETCLIENTID_CONFIRM",
1184         },
1185         [OP_VERIFY] = {
1186                 .op_func = (nfsd4op_func)nfsd4_verify,
1187                 .op_name = "OP_VERIFY",
1188         },
1189         [OP_WRITE] = {
1190                 .op_func = (nfsd4op_func)nfsd4_write,
1191                 .op_name = "OP_WRITE",
1192         },
1193         [OP_RELEASE_LOCKOWNER] = {
1194                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1195                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1196                 .op_name = "OP_RELEASE_LOCKOWNER",
1197         },
1198
1199         /* NFSv4.1 operations */
1200         [OP_EXCHANGE_ID] = {
1201                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1202                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1203                 .op_name = "OP_EXCHANGE_ID",
1204         },
1205         [OP_CREATE_SESSION] = {
1206                 .op_func = (nfsd4op_func)nfsd4_create_session,
1207                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1208                 .op_name = "OP_CREATE_SESSION",
1209         },
1210         [OP_DESTROY_SESSION] = {
1211                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1212                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1213                 .op_name = "OP_DESTROY_SESSION",
1214         },
1215         [OP_SEQUENCE] = {
1216                 .op_func = (nfsd4op_func)nfsd4_sequence,
1217                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1218                 .op_name = "OP_SEQUENCE",
1219         },
1220 };
1221
1222 static const char *nfsd4_op_name(unsigned opnum)
1223 {
1224         if (opnum < ARRAY_SIZE(nfsd4_ops))
1225                 return nfsd4_ops[opnum].op_name;
1226         return "unknown_operation";
1227 }
1228
1229 #define nfs4svc_decode_voidargs         NULL
1230 #define nfs4svc_release_void            NULL
1231 #define nfsd4_voidres                   nfsd4_voidargs
1232 #define nfs4svc_release_compound        NULL
1233 struct nfsd4_voidargs { int dummy; };
1234
1235 #define PROC(name, argt, rest, relt, cache, respsize)   \
1236  { (svc_procfunc) nfsd4_proc_##name,            \
1237    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1238    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1239    (kxdrproc_t) nfs4svc_release_##relt,         \
1240    sizeof(struct nfsd4_##argt##args),           \
1241    sizeof(struct nfsd4_##rest##res),            \
1242    0,                                           \
1243    cache,                                       \
1244    respsize,                                    \
1245  }
1246
1247 /*
1248  * TODO: At the present time, the NFSv4 server does not do XID caching
1249  * of requests.  Implementing XID caching would not be a serious problem,
1250  * although it would require a mild change in interfaces since one
1251  * doesn't know whether an NFSv4 request is idempotent until after the
1252  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1253  * Astrand's regression testsuite for NFSv4 servers), which reuses
1254  * XID's liberally, so I've left it unimplemented until pynfs generates
1255  * better XID's.
1256  */
1257 static struct svc_procedure             nfsd_procedures4[2] = {
1258   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1259   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1260 };
1261
1262 struct svc_version      nfsd_version4 = {
1263                 .vs_vers        = 4,
1264                 .vs_nproc       = 2,
1265                 .vs_proc        = nfsd_procedures4,
1266                 .vs_dispatch    = nfsd_dispatch,
1267                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1268 };
1269
1270 /*
1271  * Local variables:
1272  *  c-basic-offset: 8
1273  * End:
1274  */