Merge branch 'for-2.6.31' of git://fieldses.org/git/linux-nfsd
[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 u32 nfsd_attrmask[] = {
55         NFSD_WRITEABLE_ATTRS_WORD0,
56         NFSD_WRITEABLE_ATTRS_WORD1,
57         NFSD_WRITEABLE_ATTRS_WORD2
58 };
59
60 static u32 nfsd41_ex_attrmask[] = {
61         NFSD_SUPPATTR_EXCLCREAT_WORD0,
62         NFSD_SUPPATTR_EXCLCREAT_WORD1,
63         NFSD_SUPPATTR_EXCLCREAT_WORD2
64 };
65
66 static __be32
67 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
68                    u32 *bmval, u32 *writable)
69 {
70         struct dentry *dentry = cstate->current_fh.fh_dentry;
71         struct svc_export *exp = cstate->current_fh.fh_export;
72
73         /*
74          * Check about attributes are supported by the NFSv4 server or not.
75          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
76          */
77         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
78             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
79             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
80                 return nfserr_attrnotsupp;
81
82         /*
83          * Check FATTR4_WORD0_ACL & FATTR4_WORD0_FS_LOCATIONS can be supported
84          * in current environment or not.
85          */
86         if (bmval[0] & FATTR4_WORD0_ACL) {
87                 if (!IS_POSIXACL(dentry->d_inode))
88                         return nfserr_attrnotsupp;
89         }
90         if (bmval[0] & FATTR4_WORD0_FS_LOCATIONS) {
91                 if (exp->ex_fslocs.locations == NULL)
92                         return nfserr_attrnotsupp;
93         }
94
95         /*
96          * According to spec, read-only attributes return ERR_INVAL.
97          */
98         if (writable) {
99                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
100                     (bmval[2] & ~writable[2]))
101                         return nfserr_inval;
102         }
103
104         return nfs_ok;
105 }
106
107 static __be32
108 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
109         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
110 {
111         __be32 status = nfs_ok;
112
113         if (open->op_create == NFS4_OPEN_CREATE) {
114                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
115                     || open->op_createmode == NFS4_CREATE_GUARDED)
116                         status = check_attr_support(rqstp, cstate,
117                                         open->op_bmval, nfsd_attrmask);
118                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
119                         status = check_attr_support(rqstp, cstate,
120                                         open->op_bmval, nfsd41_ex_attrmask);
121         }
122
123         return status;
124 }
125
126 static inline void
127 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
128 {
129         fh_put(dst);
130         dget(src->fh_dentry);
131         if (src->fh_export)
132                 cache_get(&src->fh_export->h);
133         *dst = *src;
134 }
135
136 static __be32
137 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
138 {
139         __be32 status;
140
141         if (open->op_truncate &&
142                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
143                 return nfserr_inval;
144
145         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
146                 accmode |= NFSD_MAY_READ;
147         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
148                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
149         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
150                 accmode |= NFSD_MAY_WRITE;
151
152         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
153
154         return status;
155 }
156
157 static __be32
158 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
159 {
160         struct svc_fh resfh;
161         __be32 status;
162         int created = 0;
163
164         fh_init(&resfh, NFS4_FHSIZE);
165         open->op_truncate = 0;
166
167         if (open->op_create) {
168                 /* FIXME: check session persistence and pnfs flags.
169                  * The nfsv4.1 spec requires the following semantics:
170                  *
171                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
172                  * Reply Cache  | server |                 |
173                  * -------------+--------+-----------------+--------------------
174                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
175                  *              |        |                 | (SHOULD)
176                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
177                  *              |        |                 | (SHOULD NOT)
178                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
179                  * yes          | no     | GUARDED4        | GUARDED4
180                  * yes          | yes    | GUARDED4        | GUARDED4
181                  */
182
183                 /*
184                  * Note: create modes (UNCHECKED,GUARDED...) are the same
185                  * in NFSv4 as in v3.
186                  */
187                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
188                                         open->op_fname.len, &open->op_iattr,
189                                         &resfh, open->op_createmode,
190                                         (u32 *)open->op_verf.data,
191                                         &open->op_truncate, &created);
192
193                 /*
194                  * Following rfc 3530 14.2.16, use the returned bitmask
195                  * to indicate which attributes we used to store the
196                  * verifier:
197                  */
198                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
199                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
200                                                 FATTR4_WORD1_TIME_MODIFY);
201         } else {
202                 status = nfsd_lookup(rqstp, current_fh,
203                                      open->op_fname.data, open->op_fname.len, &resfh);
204                 fh_unlock(current_fh);
205         }
206         if (status)
207                 goto out;
208
209         set_change_info(&open->op_cinfo, current_fh);
210         fh_dup2(current_fh, &resfh);
211
212         /* set reply cache */
213         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
214                         &resfh.fh_handle);
215         if (!created)
216                 status = do_open_permission(rqstp, current_fh, open,
217                                             NFSD_MAY_NOP);
218
219 out:
220         fh_put(&resfh);
221         return status;
222 }
223
224 static __be32
225 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
226 {
227         __be32 status;
228
229         /* Only reclaims from previously confirmed clients are valid */
230         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
231                 return status;
232
233         /* We don't know the target directory, and therefore can not
234         * set the change info
235         */
236
237         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
238
239         /* set replay cache */
240         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
241                         &current_fh->fh_handle);
242
243         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
244                 (open->op_iattr.ia_size == 0);
245
246         status = do_open_permission(rqstp, current_fh, open,
247                                     NFSD_MAY_OWNER_OVERRIDE);
248
249         return status;
250 }
251
252 static void
253 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
254 {
255         struct nfsd4_sessionid *sid =
256                         (struct nfsd4_sessionid *)session->se_sessionid.data;
257
258         clid->cl_boot = sid->clientid.cl_boot;
259         clid->cl_id = sid->clientid.cl_id;
260 }
261
262 static __be32
263 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
264            struct nfsd4_open *open)
265 {
266         __be32 status;
267         struct nfsd4_compoundres *resp;
268
269         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
270                 (int)open->op_fname.len, open->op_fname.data,
271                 open->op_stateowner);
272
273         /* This check required by spec. */
274         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
275                 return nfserr_inval;
276
277         if (nfsd4_has_session(cstate))
278                 copy_clientid(&open->op_clientid, cstate->session);
279
280         nfs4_lock_state();
281
282         /* check seqid for replay. set nfs4_owner */
283         resp = rqstp->rq_resp;
284         status = nfsd4_process_open1(&resp->cstate, open);
285         if (status == nfserr_replay_me) {
286                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
287                 fh_put(&cstate->current_fh);
288                 fh_copy_shallow(&cstate->current_fh.fh_handle,
289                                 &rp->rp_openfh);
290                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
291                 if (status)
292                         dprintk("nfsd4_open: replay failed"
293                                 " restoring previous filehandle\n");
294                 else
295                         status = nfserr_replay_me;
296         }
297         if (status)
298                 goto out;
299
300         status = nfsd4_check_open_attributes(rqstp, cstate, open);
301         if (status)
302                 goto out;
303
304         /* Openowner is now set, so sequence id will get bumped.  Now we need
305          * these checks before we do any creates: */
306         status = nfserr_grace;
307         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
308                 goto out;
309         status = nfserr_no_grace;
310         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
311                 goto out;
312
313         switch (open->op_claim_type) {
314                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
315                 case NFS4_OPEN_CLAIM_NULL:
316                         /*
317                          * (1) set CURRENT_FH to the file being opened,
318                          * creating it if necessary, (2) set open->op_cinfo,
319                          * (3) set open->op_truncate if the file is to be
320                          * truncated after opening, (4) do permission checking.
321                          */
322                         status = do_open_lookup(rqstp, &cstate->current_fh,
323                                                 open);
324                         if (status)
325                                 goto out;
326                         break;
327                 case NFS4_OPEN_CLAIM_PREVIOUS:
328                         open->op_stateowner->so_confirmed = 1;
329                         /*
330                          * The CURRENT_FH is already set to the file being
331                          * opened.  (1) set open->op_cinfo, (2) set
332                          * open->op_truncate if the file is to be truncated
333                          * after opening, (3) do permission checking.
334                         */
335                         status = do_open_fhandle(rqstp, &cstate->current_fh,
336                                                  open);
337                         if (status)
338                                 goto out;
339                         break;
340                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
341                         open->op_stateowner->so_confirmed = 1;
342                         dprintk("NFSD: unsupported OPEN claim type %d\n",
343                                 open->op_claim_type);
344                         status = nfserr_notsupp;
345                         goto out;
346                 default:
347                         dprintk("NFSD: Invalid OPEN claim type %d\n",
348                                 open->op_claim_type);
349                         status = nfserr_inval;
350                         goto out;
351         }
352         /*
353          * nfsd4_process_open2() does the actual opening of the file.  If
354          * successful, it (1) truncates the file if open->op_truncate was
355          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
356          */
357         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
358 out:
359         if (open->op_stateowner) {
360                 nfs4_get_stateowner(open->op_stateowner);
361                 cstate->replay_owner = open->op_stateowner;
362         }
363         nfs4_unlock_state();
364         return status;
365 }
366
367 /*
368  * filehandle-manipulating ops.
369  */
370 static __be32
371 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
372             struct svc_fh **getfh)
373 {
374         if (!cstate->current_fh.fh_dentry)
375                 return nfserr_nofilehandle;
376
377         *getfh = &cstate->current_fh;
378         return nfs_ok;
379 }
380
381 static __be32
382 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
383             struct nfsd4_putfh *putfh)
384 {
385         fh_put(&cstate->current_fh);
386         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
387         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
388                putfh->pf_fhlen);
389         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
390 }
391
392 static __be32
393 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
394                 void *arg)
395 {
396         __be32 status;
397
398         fh_put(&cstate->current_fh);
399         status = exp_pseudoroot(rqstp, &cstate->current_fh);
400         return status;
401 }
402
403 static __be32
404 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
405                 void *arg)
406 {
407         if (!cstate->save_fh.fh_dentry)
408                 return nfserr_restorefh;
409
410         fh_dup2(&cstate->current_fh, &cstate->save_fh);
411         return nfs_ok;
412 }
413
414 static __be32
415 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
416              void *arg)
417 {
418         if (!cstate->current_fh.fh_dentry)
419                 return nfserr_nofilehandle;
420
421         fh_dup2(&cstate->save_fh, &cstate->current_fh);
422         return nfs_ok;
423 }
424
425 /*
426  * misc nfsv4 ops
427  */
428 static __be32
429 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
430              struct nfsd4_access *access)
431 {
432         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
433                 return nfserr_inval;
434
435         access->ac_resp_access = access->ac_req_access;
436         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
437                            &access->ac_supported);
438 }
439
440 static __be32
441 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
442              struct nfsd4_commit *commit)
443 {
444         __be32 status;
445
446         u32 *p = (u32 *)commit->co_verf.data;
447         *p++ = nfssvc_boot.tv_sec;
448         *p++ = nfssvc_boot.tv_usec;
449
450         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
451                              commit->co_count);
452         if (status == nfserr_symlink)
453                 status = nfserr_inval;
454         return status;
455 }
456
457 static __be32
458 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
459              struct nfsd4_create *create)
460 {
461         struct svc_fh resfh;
462         __be32 status;
463         dev_t rdev;
464
465         fh_init(&resfh, NFS4_FHSIZE);
466
467         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
468                            NFSD_MAY_CREATE);
469         if (status == nfserr_symlink)
470                 status = nfserr_notdir;
471         if (status)
472                 return status;
473
474         status = check_attr_support(rqstp, cstate, create->cr_bmval,
475                                     nfsd_attrmask);
476         if (status)
477                 return status;
478
479         switch (create->cr_type) {
480         case NF4LNK:
481                 /* ugh! we have to null-terminate the linktext, or
482                  * vfs_symlink() will choke.  it is always safe to
483                  * null-terminate by brute force, since at worst we
484                  * will overwrite the first byte of the create namelen
485                  * in the XDR buffer, which has already been extracted
486                  * during XDR decode.
487                  */
488                 create->cr_linkname[create->cr_linklen] = 0;
489
490                 status = nfsd_symlink(rqstp, &cstate->current_fh,
491                                       create->cr_name, create->cr_namelen,
492                                       create->cr_linkname, create->cr_linklen,
493                                       &resfh, &create->cr_iattr);
494                 break;
495
496         case NF4BLK:
497                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
498                 if (MAJOR(rdev) != create->cr_specdata1 ||
499                     MINOR(rdev) != create->cr_specdata2)
500                         return nfserr_inval;
501                 status = nfsd_create(rqstp, &cstate->current_fh,
502                                      create->cr_name, create->cr_namelen,
503                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
504                 break;
505
506         case NF4CHR:
507                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
508                 if (MAJOR(rdev) != create->cr_specdata1 ||
509                     MINOR(rdev) != create->cr_specdata2)
510                         return nfserr_inval;
511                 status = nfsd_create(rqstp, &cstate->current_fh,
512                                      create->cr_name, create->cr_namelen,
513                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
514                 break;
515
516         case NF4SOCK:
517                 status = nfsd_create(rqstp, &cstate->current_fh,
518                                      create->cr_name, create->cr_namelen,
519                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
520                 break;
521
522         case NF4FIFO:
523                 status = nfsd_create(rqstp, &cstate->current_fh,
524                                      create->cr_name, create->cr_namelen,
525                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
526                 break;
527
528         case NF4DIR:
529                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
530                 status = nfsd_create(rqstp, &cstate->current_fh,
531                                      create->cr_name, create->cr_namelen,
532                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
533                 break;
534
535         default:
536                 status = nfserr_badtype;
537         }
538
539         if (!status) {
540                 fh_unlock(&cstate->current_fh);
541                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
542                 fh_dup2(&cstate->current_fh, &resfh);
543         }
544
545         fh_put(&resfh);
546         return status;
547 }
548
549 static __be32
550 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
551               struct nfsd4_getattr *getattr)
552 {
553         __be32 status;
554
555         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
556         if (status)
557                 return status;
558
559         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
560                 return nfserr_inval;
561
562         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
563         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
564         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
565
566         getattr->ga_fhp = &cstate->current_fh;
567         return nfs_ok;
568 }
569
570 static __be32
571 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
572            struct nfsd4_link *link)
573 {
574         __be32 status = nfserr_nofilehandle;
575
576         if (!cstate->save_fh.fh_dentry)
577                 return status;
578         status = nfsd_link(rqstp, &cstate->current_fh,
579                            link->li_name, link->li_namelen, &cstate->save_fh);
580         if (!status)
581                 set_change_info(&link->li_cinfo, &cstate->current_fh);
582         return status;
583 }
584
585 static __be32
586 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
587               void *arg)
588 {
589         struct svc_fh tmp_fh;
590         __be32 ret;
591
592         fh_init(&tmp_fh, NFS4_FHSIZE);
593         ret = exp_pseudoroot(rqstp, &tmp_fh);
594         if (ret)
595                 return ret;
596         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
597                 fh_put(&tmp_fh);
598                 return nfserr_noent;
599         }
600         fh_put(&tmp_fh);
601         return nfsd_lookup(rqstp, &cstate->current_fh,
602                            "..", 2, &cstate->current_fh);
603 }
604
605 static __be32
606 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
607              struct nfsd4_lookup *lookup)
608 {
609         return nfsd_lookup(rqstp, &cstate->current_fh,
610                            lookup->lo_name, lookup->lo_len,
611                            &cstate->current_fh);
612 }
613
614 static __be32
615 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
616            struct nfsd4_read *read)
617 {
618         __be32 status;
619
620         /* no need to check permission - this will be done in nfsd_read() */
621
622         read->rd_filp = NULL;
623         if (read->rd_offset >= OFFSET_MAX)
624                 return nfserr_inval;
625
626         nfs4_lock_state();
627         /* check stateid */
628         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
629                                                  RD_STATE, &read->rd_filp))) {
630                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
631                 goto out;
632         }
633         if (read->rd_filp)
634                 get_file(read->rd_filp);
635         status = nfs_ok;
636 out:
637         nfs4_unlock_state();
638         read->rd_rqstp = rqstp;
639         read->rd_fhp = &cstate->current_fh;
640         return status;
641 }
642
643 static __be32
644 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
645               struct nfsd4_readdir *readdir)
646 {
647         u64 cookie = readdir->rd_cookie;
648         static const nfs4_verifier zeroverf;
649
650         /* no need to check permission - this will be done in nfsd_readdir() */
651
652         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
653                 return nfserr_inval;
654
655         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
656         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
657         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
658
659         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
660             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
661                 return nfserr_bad_cookie;
662
663         readdir->rd_rqstp = rqstp;
664         readdir->rd_fhp = &cstate->current_fh;
665         return nfs_ok;
666 }
667
668 static __be32
669 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
670                struct nfsd4_readlink *readlink)
671 {
672         readlink->rl_rqstp = rqstp;
673         readlink->rl_fhp = &cstate->current_fh;
674         return nfs_ok;
675 }
676
677 static __be32
678 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
679              struct nfsd4_remove *remove)
680 {
681         __be32 status;
682
683         if (locks_in_grace())
684                 return nfserr_grace;
685         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
686                              remove->rm_name, remove->rm_namelen);
687         if (status == nfserr_symlink)
688                 return nfserr_notdir;
689         if (!status) {
690                 fh_unlock(&cstate->current_fh);
691                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
692         }
693         return status;
694 }
695
696 static __be32
697 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
698              struct nfsd4_rename *rename)
699 {
700         __be32 status = nfserr_nofilehandle;
701
702         if (!cstate->save_fh.fh_dentry)
703                 return status;
704         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
705                                         & NFSEXP_NOSUBTREECHECK))
706                 return nfserr_grace;
707         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
708                              rename->rn_snamelen, &cstate->current_fh,
709                              rename->rn_tname, rename->rn_tnamelen);
710
711         /* the underlying filesystem returns different error's than required
712          * by NFSv4. both save_fh and current_fh have been verified.. */
713         if (status == nfserr_isdir)
714                 status = nfserr_exist;
715         else if ((status == nfserr_notdir) &&
716                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
717                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
718                 status = nfserr_exist;
719         else if (status == nfserr_symlink)
720                 status = nfserr_notdir;
721
722         if (!status) {
723                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
724                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
725         }
726         return status;
727 }
728
729 static __be32
730 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
731               struct nfsd4_secinfo *secinfo)
732 {
733         struct svc_fh resfh;
734         struct svc_export *exp;
735         struct dentry *dentry;
736         __be32 err;
737
738         fh_init(&resfh, NFS4_FHSIZE);
739         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
740                                     secinfo->si_name, secinfo->si_namelen,
741                                     &exp, &dentry);
742         if (err)
743                 return err;
744         if (dentry->d_inode == NULL) {
745                 exp_put(exp);
746                 err = nfserr_noent;
747         } else
748                 secinfo->si_exp = exp;
749         dput(dentry);
750         return err;
751 }
752
753 static __be32
754 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
755               struct nfsd4_setattr *setattr)
756 {
757         __be32 status = nfs_ok;
758
759         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
760                 nfs4_lock_state();
761                 status = nfs4_preprocess_stateid_op(cstate,
762                         &setattr->sa_stateid, WR_STATE, NULL);
763                 nfs4_unlock_state();
764                 if (status) {
765                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
766                         return status;
767                 }
768         }
769         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
770         if (status)
771                 return status;
772         status = nfs_ok;
773
774         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
775                                     nfsd_attrmask);
776         if (status)
777                 goto out;
778
779         if (setattr->sa_acl != NULL)
780                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
781                                             setattr->sa_acl);
782         if (status)
783                 goto out;
784         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
785                                 0, (time_t)0);
786 out:
787         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
788         return status;
789 }
790
791 static __be32
792 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
793             struct nfsd4_write *write)
794 {
795         stateid_t *stateid = &write->wr_stateid;
796         struct file *filp = NULL;
797         u32 *p;
798         __be32 status = nfs_ok;
799         unsigned long cnt;
800
801         /* no need to check permission - this will be done in nfsd_write() */
802
803         if (write->wr_offset >= OFFSET_MAX)
804                 return nfserr_inval;
805
806         nfs4_lock_state();
807         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
808         if (filp)
809                 get_file(filp);
810         nfs4_unlock_state();
811
812         if (status) {
813                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
814                 return status;
815         }
816
817         cnt = write->wr_buflen;
818         write->wr_how_written = write->wr_stable_how;
819         p = (u32 *)write->wr_verifier.data;
820         *p++ = nfssvc_boot.tv_sec;
821         *p++ = nfssvc_boot.tv_usec;
822
823         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
824                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
825                              &cnt, &write->wr_how_written);
826         if (filp)
827                 fput(filp);
828
829         write->wr_bytes_written = cnt;
830
831         if (status == nfserr_symlink)
832                 status = nfserr_inval;
833         return status;
834 }
835
836 /* This routine never returns NFS_OK!  If there are no other errors, it
837  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
838  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
839  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
840  */
841 static __be32
842 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
843              struct nfsd4_verify *verify)
844 {
845         __be32 *buf, *p;
846         int count;
847         __be32 status;
848
849         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
850         if (status)
851                 return status;
852
853         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
854         if (status)
855                 return status;
856
857         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
858             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
859                 return nfserr_inval;
860         if (verify->ve_attrlen & 3)
861                 return nfserr_inval;
862
863         /* count in words:
864          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
865          */
866         count = 4 + (verify->ve_attrlen >> 2);
867         buf = kmalloc(count << 2, GFP_KERNEL);
868         if (!buf)
869                 return nfserr_resource;
870
871         status = nfsd4_encode_fattr(&cstate->current_fh,
872                                     cstate->current_fh.fh_export,
873                                     cstate->current_fh.fh_dentry, buf,
874                                     &count, verify->ve_bmval,
875                                     rqstp, 0);
876
877         /* this means that nfsd4_encode_fattr() ran out of space */
878         if (status == nfserr_resource && count == 0)
879                 status = nfserr_not_same;
880         if (status)
881                 goto out_kfree;
882
883         /* skip bitmap */
884         p = buf + 1 + ntohl(buf[0]);
885         status = nfserr_not_same;
886         if (ntohl(*p++) != verify->ve_attrlen)
887                 goto out_kfree;
888         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
889                 status = nfserr_same;
890
891 out_kfree:
892         kfree(buf);
893         return status;
894 }
895
896 static __be32
897 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
898               struct nfsd4_verify *verify)
899 {
900         __be32 status;
901
902         status = _nfsd4_verify(rqstp, cstate, verify);
903         return status == nfserr_not_same ? nfs_ok : status;
904 }
905
906 static __be32
907 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
908              struct nfsd4_verify *verify)
909 {
910         __be32 status;
911
912         status = _nfsd4_verify(rqstp, cstate, verify);
913         return status == nfserr_same ? nfs_ok : status;
914 }
915
916 /*
917  * NULL call.
918  */
919 static __be32
920 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
921 {
922         return nfs_ok;
923 }
924
925 static inline void nfsd4_increment_op_stats(u32 opnum)
926 {
927         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
928                 nfsdstats.nfs4_opcount[opnum]++;
929 }
930
931 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
932                               void *);
933 enum nfsd4_op_flags {
934         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
935         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
936         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
937 };
938
939 struct nfsd4_operation {
940         nfsd4op_func op_func;
941         u32 op_flags;
942         char *op_name;
943 };
944
945 static struct nfsd4_operation nfsd4_ops[];
946
947 static const char *nfsd4_op_name(unsigned opnum);
948
949 /*
950  * This is a replay of a compound for which no cache entry pages
951  * were used. Encode the sequence operation, and if cachethis is FALSE
952  * encode the uncache rep error on the next operation.
953  */
954 static __be32
955 nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
956                          struct nfsd4_compoundres *resp)
957 {
958         struct nfsd4_op *op;
959
960         dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
961                 resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
962
963         /* Encode the replayed sequence operation */
964         BUG_ON(resp->opcnt != 1);
965         op = &args->ops[resp->opcnt - 1];
966         nfsd4_encode_operation(resp, op);
967
968         /*return nfserr_retry_uncached_rep in next operation. */
969         if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
970                 op = &args->ops[resp->opcnt++];
971                 op->status = nfserr_retry_uncached_rep;
972                 nfsd4_encode_operation(resp, op);
973         }
974         return op->status;
975 }
976
977 /*
978  * Enforce NFSv4.1 COMPOUND ordering rules.
979  *
980  * TODO:
981  * - enforce NFS4ERR_NOT_ONLY_OP,
982  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
983  */
984 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
985 {
986         if (args->minorversion && args->opcnt > 0) {
987                 struct nfsd4_op *op = &args->ops[0];
988                 return (op->status == nfserr_op_illegal) ||
989                        (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
990         }
991         return true;
992 }
993
994 /*
995  * COMPOUND call.
996  */
997 static __be32
998 nfsd4_proc_compound(struct svc_rqst *rqstp,
999                     struct nfsd4_compoundargs *args,
1000                     struct nfsd4_compoundres *resp)
1001 {
1002         struct nfsd4_op *op;
1003         struct nfsd4_operation *opdesc;
1004         struct nfsd4_compound_state *cstate = &resp->cstate;
1005         int             slack_bytes;
1006         __be32          status;
1007
1008         resp->xbuf = &rqstp->rq_res;
1009         resp->p = rqstp->rq_res.head[0].iov_base +
1010                                                 rqstp->rq_res.head[0].iov_len;
1011         resp->tagp = resp->p;
1012         /* reserve space for: taglen, tag, and opcnt */
1013         resp->p += 2 + XDR_QUADLEN(args->taglen);
1014         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1015         resp->taglen = args->taglen;
1016         resp->tag = args->tag;
1017         resp->opcnt = 0;
1018         resp->rqstp = rqstp;
1019         resp->cstate.minorversion = args->minorversion;
1020         resp->cstate.replay_owner = NULL;
1021         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1022         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1023         /* Use the deferral mechanism only for NFSv4.0 compounds */
1024         rqstp->rq_usedeferral = (args->minorversion == 0);
1025
1026         /*
1027          * According to RFC3010, this takes precedence over all other errors.
1028          */
1029         status = nfserr_minor_vers_mismatch;
1030         if (args->minorversion > nfsd_supported_minorversion)
1031                 goto out;
1032
1033         if (!nfs41_op_ordering_ok(args)) {
1034                 op = &args->ops[0];
1035                 op->status = nfserr_sequence_pos;
1036                 goto encode_op;
1037         }
1038
1039         status = nfs_ok;
1040         while (!status && resp->opcnt < args->opcnt) {
1041                 op = &args->ops[resp->opcnt++];
1042
1043                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1044                         resp->opcnt, args->opcnt, op->opnum,
1045                         nfsd4_op_name(op->opnum));
1046                 /*
1047                  * The XDR decode routines may have pre-set op->status;
1048                  * for example, if there is a miscellaneous XDR error
1049                  * it will be set to nfserr_bad_xdr.
1050                  */
1051                 if (op->status)
1052                         goto encode_op;
1053
1054                 /* We must be able to encode a successful response to
1055                  * this operation, with enough room left over to encode a
1056                  * failed response to the next operation.  If we don't
1057                  * have enough room, fail with ERR_RESOURCE.
1058                  */
1059                 slack_bytes = (char *)resp->end - (char *)resp->p;
1060                 if (slack_bytes < COMPOUND_SLACK_SPACE
1061                                 + COMPOUND_ERR_SLACK_SPACE) {
1062                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1063                         op->status = nfserr_resource;
1064                         goto encode_op;
1065                 }
1066
1067                 opdesc = &nfsd4_ops[op->opnum];
1068
1069                 if (!cstate->current_fh.fh_dentry) {
1070                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1071                                 op->status = nfserr_nofilehandle;
1072                                 goto encode_op;
1073                         }
1074                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1075                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1076                         op->status = nfserr_moved;
1077                         goto encode_op;
1078                 }
1079
1080                 if (opdesc->op_func)
1081                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1082                 else
1083                         BUG_ON(op->status == nfs_ok);
1084
1085 encode_op:
1086                 /* Only from SEQUENCE or CREATE_SESSION */
1087                 if (resp->cstate.status == nfserr_replay_cache) {
1088                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1089                         if (nfsd4_not_cached(resp))
1090                                 status = nfsd4_enc_uncached_replay(args, resp);
1091                         else
1092                                 status = op->status;
1093                         goto out;
1094                 }
1095                 if (op->status == nfserr_replay_me) {
1096                         op->replay = &cstate->replay_owner->so_replay;
1097                         nfsd4_encode_replay(resp, op);
1098                         status = op->status = op->replay->rp_status;
1099                 } else {
1100                         nfsd4_encode_operation(resp, op);
1101                         status = op->status;
1102                 }
1103
1104                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1105                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1106                         be32_to_cpu(status));
1107
1108                 if (cstate->replay_owner) {
1109                         nfs4_put_stateowner(cstate->replay_owner);
1110                         cstate->replay_owner = NULL;
1111                 }
1112                 /* XXX Ugh, we need to get rid of this kind of special case: */
1113                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1114                         fput(op->u.read.rd_filp);
1115
1116                 nfsd4_increment_op_stats(op->opnum);
1117         }
1118         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1119                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1120                 status = nfserr_jukebox;
1121         }
1122
1123         resp->cstate.status = status;
1124         fh_put(&resp->cstate.current_fh);
1125         fh_put(&resp->cstate.save_fh);
1126         BUG_ON(resp->cstate.replay_owner);
1127 out:
1128         nfsd4_release_compoundargs(args);
1129         /* Reset deferral mechanism for RPC deferrals */
1130         rqstp->rq_usedeferral = 1;
1131         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1132         return status;
1133 }
1134
1135 static struct nfsd4_operation nfsd4_ops[] = {
1136         [OP_ACCESS] = {
1137                 .op_func = (nfsd4op_func)nfsd4_access,
1138                 .op_name = "OP_ACCESS",
1139         },
1140         [OP_CLOSE] = {
1141                 .op_func = (nfsd4op_func)nfsd4_close,
1142                 .op_name = "OP_CLOSE",
1143         },
1144         [OP_COMMIT] = {
1145                 .op_func = (nfsd4op_func)nfsd4_commit,
1146                 .op_name = "OP_COMMIT",
1147         },
1148         [OP_CREATE] = {
1149                 .op_func = (nfsd4op_func)nfsd4_create,
1150                 .op_name = "OP_CREATE",
1151         },
1152         [OP_DELEGRETURN] = {
1153                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1154                 .op_name = "OP_DELEGRETURN",
1155         },
1156         [OP_GETATTR] = {
1157                 .op_func = (nfsd4op_func)nfsd4_getattr,
1158                 .op_flags = ALLOWED_ON_ABSENT_FS,
1159                 .op_name = "OP_GETATTR",
1160         },
1161         [OP_GETFH] = {
1162                 .op_func = (nfsd4op_func)nfsd4_getfh,
1163                 .op_name = "OP_GETFH",
1164         },
1165         [OP_LINK] = {
1166                 .op_func = (nfsd4op_func)nfsd4_link,
1167                 .op_name = "OP_LINK",
1168         },
1169         [OP_LOCK] = {
1170                 .op_func = (nfsd4op_func)nfsd4_lock,
1171                 .op_name = "OP_LOCK",
1172         },
1173         [OP_LOCKT] = {
1174                 .op_func = (nfsd4op_func)nfsd4_lockt,
1175                 .op_name = "OP_LOCKT",
1176         },
1177         [OP_LOCKU] = {
1178                 .op_func = (nfsd4op_func)nfsd4_locku,
1179                 .op_name = "OP_LOCKU",
1180         },
1181         [OP_LOOKUP] = {
1182                 .op_func = (nfsd4op_func)nfsd4_lookup,
1183                 .op_name = "OP_LOOKUP",
1184         },
1185         [OP_LOOKUPP] = {
1186                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1187                 .op_name = "OP_LOOKUPP",
1188         },
1189         [OP_NVERIFY] = {
1190                 .op_func = (nfsd4op_func)nfsd4_nverify,
1191                 .op_name = "OP_NVERIFY",
1192         },
1193         [OP_OPEN] = {
1194                 .op_func = (nfsd4op_func)nfsd4_open,
1195                 .op_name = "OP_OPEN",
1196         },
1197         [OP_OPEN_CONFIRM] = {
1198                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1199                 .op_name = "OP_OPEN_CONFIRM",
1200         },
1201         [OP_OPEN_DOWNGRADE] = {
1202                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1203                 .op_name = "OP_OPEN_DOWNGRADE",
1204         },
1205         [OP_PUTFH] = {
1206                 .op_func = (nfsd4op_func)nfsd4_putfh,
1207                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1208                 .op_name = "OP_PUTFH",
1209         },
1210         [OP_PUTPUBFH] = {
1211                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1212                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1213                 .op_name = "OP_PUTPUBFH",
1214         },
1215         [OP_PUTROOTFH] = {
1216                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1217                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1218                 .op_name = "OP_PUTROOTFH",
1219         },
1220         [OP_READ] = {
1221                 .op_func = (nfsd4op_func)nfsd4_read,
1222                 .op_name = "OP_READ",
1223         },
1224         [OP_READDIR] = {
1225                 .op_func = (nfsd4op_func)nfsd4_readdir,
1226                 .op_name = "OP_READDIR",
1227         },
1228         [OP_READLINK] = {
1229                 .op_func = (nfsd4op_func)nfsd4_readlink,
1230                 .op_name = "OP_READLINK",
1231         },
1232         [OP_REMOVE] = {
1233                 .op_func = (nfsd4op_func)nfsd4_remove,
1234                 .op_name = "OP_REMOVE",
1235         },
1236         [OP_RENAME] = {
1237                 .op_name = "OP_RENAME",
1238                 .op_func = (nfsd4op_func)nfsd4_rename,
1239         },
1240         [OP_RENEW] = {
1241                 .op_func = (nfsd4op_func)nfsd4_renew,
1242                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1243                 .op_name = "OP_RENEW",
1244         },
1245         [OP_RESTOREFH] = {
1246                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1247                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1248                 .op_name = "OP_RESTOREFH",
1249         },
1250         [OP_SAVEFH] = {
1251                 .op_func = (nfsd4op_func)nfsd4_savefh,
1252                 .op_name = "OP_SAVEFH",
1253         },
1254         [OP_SECINFO] = {
1255                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1256                 .op_name = "OP_SECINFO",
1257         },
1258         [OP_SETATTR] = {
1259                 .op_func = (nfsd4op_func)nfsd4_setattr,
1260                 .op_name = "OP_SETATTR",
1261         },
1262         [OP_SETCLIENTID] = {
1263                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1264                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1265                 .op_name = "OP_SETCLIENTID",
1266         },
1267         [OP_SETCLIENTID_CONFIRM] = {
1268                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1269                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1270                 .op_name = "OP_SETCLIENTID_CONFIRM",
1271         },
1272         [OP_VERIFY] = {
1273                 .op_func = (nfsd4op_func)nfsd4_verify,
1274                 .op_name = "OP_VERIFY",
1275         },
1276         [OP_WRITE] = {
1277                 .op_func = (nfsd4op_func)nfsd4_write,
1278                 .op_name = "OP_WRITE",
1279         },
1280         [OP_RELEASE_LOCKOWNER] = {
1281                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1282                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1283                 .op_name = "OP_RELEASE_LOCKOWNER",
1284         },
1285
1286         /* NFSv4.1 operations */
1287         [OP_EXCHANGE_ID] = {
1288                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1289                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1290                 .op_name = "OP_EXCHANGE_ID",
1291         },
1292         [OP_CREATE_SESSION] = {
1293                 .op_func = (nfsd4op_func)nfsd4_create_session,
1294                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1295                 .op_name = "OP_CREATE_SESSION",
1296         },
1297         [OP_DESTROY_SESSION] = {
1298                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1299                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1300                 .op_name = "OP_DESTROY_SESSION",
1301         },
1302         [OP_SEQUENCE] = {
1303                 .op_func = (nfsd4op_func)nfsd4_sequence,
1304                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1305                 .op_name = "OP_SEQUENCE",
1306         },
1307 };
1308
1309 static const char *nfsd4_op_name(unsigned opnum)
1310 {
1311         if (opnum < ARRAY_SIZE(nfsd4_ops))
1312                 return nfsd4_ops[opnum].op_name;
1313         return "unknown_operation";
1314 }
1315
1316 #define nfsd4_voidres                   nfsd4_voidargs
1317 struct nfsd4_voidargs { int dummy; };
1318
1319 /*
1320  * TODO: At the present time, the NFSv4 server does not do XID caching
1321  * of requests.  Implementing XID caching would not be a serious problem,
1322  * although it would require a mild change in interfaces since one
1323  * doesn't know whether an NFSv4 request is idempotent until after the
1324  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1325  * Astrand's regression testsuite for NFSv4 servers), which reuses
1326  * XID's liberally, so I've left it unimplemented until pynfs generates
1327  * better XID's.
1328  */
1329 static struct svc_procedure             nfsd_procedures4[2] = {
1330         [NFSPROC4_NULL] = {
1331                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1332                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1333                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1334                 .pc_ressize = sizeof(struct nfsd4_voidres),
1335                 .pc_cachetype = RC_NOCACHE,
1336                 .pc_xdrressize = 1,
1337         },
1338         [NFSPROC4_COMPOUND] = {
1339                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1340                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1341                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1342                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1343                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1344                 .pc_cachetype = RC_NOCACHE,
1345                 .pc_xdrressize = NFSD_BUFSIZE/4,
1346         },
1347 };
1348
1349 struct svc_version      nfsd_version4 = {
1350                 .vs_vers        = 4,
1351                 .vs_nproc       = 2,
1352                 .vs_proc        = nfsd_procedures4,
1353                 .vs_dispatch    = nfsd_dispatch,
1354                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1355 };
1356
1357 /*
1358  * Local variables:
1359  *  c-basic-offset: 8
1360  * End:
1361  */