NFSD: allow OP_DESTROY_CLIENTID to be only op in COMPOUND
[linux-2.6.git] / fs / nfsd / nfs4proc.c
1 /*
2  *  Server-side procedures for NFSv4.
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  */
35 #include <linux/file.h>
36 #include <linux/slab.h>
37
38 #include "cache.h"
39 #include "xdr4.h"
40 #include "vfs.h"
41
42 #define NFSDDBG_FACILITY                NFSDDBG_PROC
43
44 static u32 nfsd_attrmask[] = {
45         NFSD_WRITEABLE_ATTRS_WORD0,
46         NFSD_WRITEABLE_ATTRS_WORD1,
47         NFSD_WRITEABLE_ATTRS_WORD2
48 };
49
50 static u32 nfsd41_ex_attrmask[] = {
51         NFSD_SUPPATTR_EXCLCREAT_WORD0,
52         NFSD_SUPPATTR_EXCLCREAT_WORD1,
53         NFSD_SUPPATTR_EXCLCREAT_WORD2
54 };
55
56 static __be32
57 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
58                    u32 *bmval, u32 *writable)
59 {
60         struct dentry *dentry = cstate->current_fh.fh_dentry;
61
62         /*
63          * Check about attributes are supported by the NFSv4 server or not.
64          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
65          */
66         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
67             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
68             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
69                 return nfserr_attrnotsupp;
70
71         /*
72          * Check FATTR4_WORD0_ACL can be supported
73          * in current environment or not.
74          */
75         if (bmval[0] & FATTR4_WORD0_ACL) {
76                 if (!IS_POSIXACL(dentry->d_inode))
77                         return nfserr_attrnotsupp;
78         }
79
80         /*
81          * According to spec, read-only attributes return ERR_INVAL.
82          */
83         if (writable) {
84                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
85                     (bmval[2] & ~writable[2]))
86                         return nfserr_inval;
87         }
88
89         return nfs_ok;
90 }
91
92 static __be32
93 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
94         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
95 {
96         __be32 status = nfs_ok;
97
98         if (open->op_create == NFS4_OPEN_CREATE) {
99                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
100                     || open->op_createmode == NFS4_CREATE_GUARDED)
101                         status = check_attr_support(rqstp, cstate,
102                                         open->op_bmval, nfsd_attrmask);
103                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
104                         status = check_attr_support(rqstp, cstate,
105                                         open->op_bmval, nfsd41_ex_attrmask);
106         }
107
108         return status;
109 }
110
111 static int
112 is_create_with_attrs(struct nfsd4_open *open)
113 {
114         return open->op_create == NFS4_OPEN_CREATE
115                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
116                     || open->op_createmode == NFS4_CREATE_GUARDED
117                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
118 }
119
120 /*
121  * if error occurs when setting the acl, just clear the acl bit
122  * in the returned attr bitmap.
123  */
124 static void
125 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
126                 struct nfs4_acl *acl, u32 *bmval)
127 {
128         __be32 status;
129
130         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
131         if (status)
132                 /*
133                  * We should probably fail the whole open at this point,
134                  * but we've already created the file, so it's too late;
135                  * So this seems the least of evils:
136                  */
137                 bmval[0] &= ~FATTR4_WORD0_ACL;
138 }
139
140 static inline void
141 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
142 {
143         fh_put(dst);
144         dget(src->fh_dentry);
145         if (src->fh_export)
146                 cache_get(&src->fh_export->h);
147         *dst = *src;
148 }
149
150 static __be32
151 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
152 {
153         __be32 status;
154
155         if (open->op_truncate &&
156                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
157                 return nfserr_inval;
158
159         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
160                 accmode |= NFSD_MAY_READ;
161         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
162                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
163         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
164                 accmode |= NFSD_MAY_WRITE;
165
166         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
167
168         return status;
169 }
170
171 static __be32
172 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
173 {
174         struct svc_fh resfh;
175         __be32 status;
176         int created = 0;
177
178         fh_init(&resfh, NFS4_FHSIZE);
179         open->op_truncate = 0;
180
181         if (open->op_create) {
182                 /* FIXME: check session persistence and pnfs flags.
183                  * The nfsv4.1 spec requires the following semantics:
184                  *
185                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
186                  * Reply Cache  | server |                 |
187                  * -------------+--------+-----------------+--------------------
188                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
189                  *              |        |                 | (SHOULD)
190                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
191                  *              |        |                 | (SHOULD NOT)
192                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
193                  * yes          | no     | GUARDED4        | GUARDED4
194                  * yes          | yes    | GUARDED4        | GUARDED4
195                  */
196
197                 /*
198                  * Note: create modes (UNCHECKED,GUARDED...) are the same
199                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
200                  */
201                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
202                                         open->op_fname.len, &open->op_iattr,
203                                         &resfh, open->op_createmode,
204                                         (u32 *)open->op_verf.data,
205                                         &open->op_truncate, &created);
206
207                 /*
208                  * Following rfc 3530 14.2.16, use the returned bitmask
209                  * to indicate which attributes we used to store the
210                  * verifier:
211                  */
212                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
213                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
214                                                 FATTR4_WORD1_TIME_MODIFY);
215         } else {
216                 status = nfsd_lookup(rqstp, current_fh,
217                                      open->op_fname.data, open->op_fname.len, &resfh);
218                 fh_unlock(current_fh);
219         }
220         if (status)
221                 goto out;
222
223         if (is_create_with_attrs(open) && open->op_acl != NULL)
224                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
225
226         set_change_info(&open->op_cinfo, current_fh);
227         fh_dup2(current_fh, &resfh);
228
229         /* set reply cache */
230         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
231                         &resfh.fh_handle);
232         if (!created)
233                 status = do_open_permission(rqstp, current_fh, open,
234                                             NFSD_MAY_NOP);
235
236 out:
237         fh_put(&resfh);
238         return status;
239 }
240
241 static __be32
242 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
243 {
244         __be32 status;
245
246         /* Only reclaims from previously confirmed clients are valid */
247         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
248                 return status;
249
250         /* We don't know the target directory, and therefore can not
251         * set the change info
252         */
253
254         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
255
256         /* set replay cache */
257         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
258                         &current_fh->fh_handle);
259
260         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
261                 (open->op_iattr.ia_size == 0);
262
263         status = do_open_permission(rqstp, current_fh, open,
264                                     NFSD_MAY_OWNER_OVERRIDE);
265
266         return status;
267 }
268
269 static void
270 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
271 {
272         struct nfsd4_sessionid *sid =
273                         (struct nfsd4_sessionid *)session->se_sessionid.data;
274
275         clid->cl_boot = sid->clientid.cl_boot;
276         clid->cl_id = sid->clientid.cl_id;
277 }
278
279 static __be32
280 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
281            struct nfsd4_open *open)
282 {
283         __be32 status;
284         struct nfsd4_compoundres *resp;
285
286         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
287                 (int)open->op_fname.len, open->op_fname.data,
288                 open->op_stateowner);
289
290         /* This check required by spec. */
291         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
292                 return nfserr_inval;
293
294         if (nfsd4_has_session(cstate))
295                 copy_clientid(&open->op_clientid, cstate->session);
296
297         nfs4_lock_state();
298
299         /* check seqid for replay. set nfs4_owner */
300         resp = rqstp->rq_resp;
301         status = nfsd4_process_open1(&resp->cstate, open);
302         if (status == nfserr_replay_me) {
303                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
304                 fh_put(&cstate->current_fh);
305                 fh_copy_shallow(&cstate->current_fh.fh_handle,
306                                 &rp->rp_openfh);
307                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
308                 if (status)
309                         dprintk("nfsd4_open: replay failed"
310                                 " restoring previous filehandle\n");
311                 else
312                         status = nfserr_replay_me;
313         }
314         if (status)
315                 goto out;
316
317         status = nfsd4_check_open_attributes(rqstp, cstate, open);
318         if (status)
319                 goto out;
320
321         /* Openowner is now set, so sequence id will get bumped.  Now we need
322          * these checks before we do any creates: */
323         status = nfserr_grace;
324         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
325                 goto out;
326         status = nfserr_no_grace;
327         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
328                 goto out;
329
330         switch (open->op_claim_type) {
331                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
332                 case NFS4_OPEN_CLAIM_NULL:
333                         /*
334                          * (1) set CURRENT_FH to the file being opened,
335                          * creating it if necessary, (2) set open->op_cinfo,
336                          * (3) set open->op_truncate if the file is to be
337                          * truncated after opening, (4) do permission checking.
338                          */
339                         status = do_open_lookup(rqstp, &cstate->current_fh,
340                                                 open);
341                         if (status)
342                                 goto out;
343                         break;
344                 case NFS4_OPEN_CLAIM_PREVIOUS:
345                         open->op_stateowner->so_confirmed = 1;
346                         /*
347                          * The CURRENT_FH is already set to the file being
348                          * opened.  (1) set open->op_cinfo, (2) set
349                          * open->op_truncate if the file is to be truncated
350                          * after opening, (3) do permission checking.
351                         */
352                         status = do_open_fhandle(rqstp, &cstate->current_fh,
353                                                  open);
354                         if (status)
355                                 goto out;
356                         break;
357                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
358                         open->op_stateowner->so_confirmed = 1;
359                         dprintk("NFSD: unsupported OPEN claim type %d\n",
360                                 open->op_claim_type);
361                         status = nfserr_notsupp;
362                         goto out;
363                 default:
364                         dprintk("NFSD: Invalid OPEN claim type %d\n",
365                                 open->op_claim_type);
366                         status = nfserr_inval;
367                         goto out;
368         }
369         /*
370          * nfsd4_process_open2() does the actual opening of the file.  If
371          * successful, it (1) truncates the file if open->op_truncate was
372          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
373          */
374         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
375 out:
376         if (open->op_stateowner) {
377                 nfs4_get_stateowner(open->op_stateowner);
378                 cstate->replay_owner = open->op_stateowner;
379         }
380         nfs4_unlock_state();
381         return status;
382 }
383
384 /*
385  * filehandle-manipulating ops.
386  */
387 static __be32
388 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
389             struct svc_fh **getfh)
390 {
391         if (!cstate->current_fh.fh_dentry)
392                 return nfserr_nofilehandle;
393
394         *getfh = &cstate->current_fh;
395         return nfs_ok;
396 }
397
398 static __be32
399 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
400             struct nfsd4_putfh *putfh)
401 {
402         fh_put(&cstate->current_fh);
403         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
404         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
405                putfh->pf_fhlen);
406         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
407 }
408
409 static __be32
410 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
411                 void *arg)
412 {
413         __be32 status;
414
415         fh_put(&cstate->current_fh);
416         status = exp_pseudoroot(rqstp, &cstate->current_fh);
417         return status;
418 }
419
420 static __be32
421 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
422                 void *arg)
423 {
424         if (!cstate->save_fh.fh_dentry)
425                 return nfserr_restorefh;
426
427         fh_dup2(&cstate->current_fh, &cstate->save_fh);
428         return nfs_ok;
429 }
430
431 static __be32
432 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
433              void *arg)
434 {
435         if (!cstate->current_fh.fh_dentry)
436                 return nfserr_nofilehandle;
437
438         fh_dup2(&cstate->save_fh, &cstate->current_fh);
439         return nfs_ok;
440 }
441
442 /*
443  * misc nfsv4 ops
444  */
445 static __be32
446 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
447              struct nfsd4_access *access)
448 {
449         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
450                 return nfserr_inval;
451
452         access->ac_resp_access = access->ac_req_access;
453         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
454                            &access->ac_supported);
455 }
456
457 static __be32
458 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
459              struct nfsd4_commit *commit)
460 {
461         __be32 status;
462
463         u32 *p = (u32 *)commit->co_verf.data;
464         *p++ = nfssvc_boot.tv_sec;
465         *p++ = nfssvc_boot.tv_usec;
466
467         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
468                              commit->co_count);
469         if (status == nfserr_symlink)
470                 status = nfserr_inval;
471         return status;
472 }
473
474 static __be32
475 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
476              struct nfsd4_create *create)
477 {
478         struct svc_fh resfh;
479         __be32 status;
480         dev_t rdev;
481
482         fh_init(&resfh, NFS4_FHSIZE);
483
484         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
485                            NFSD_MAY_CREATE);
486         if (status == nfserr_symlink)
487                 status = nfserr_notdir;
488         if (status)
489                 return status;
490
491         status = check_attr_support(rqstp, cstate, create->cr_bmval,
492                                     nfsd_attrmask);
493         if (status)
494                 return status;
495
496         switch (create->cr_type) {
497         case NF4LNK:
498                 /* ugh! we have to null-terminate the linktext, or
499                  * vfs_symlink() will choke.  it is always safe to
500                  * null-terminate by brute force, since at worst we
501                  * will overwrite the first byte of the create namelen
502                  * in the XDR buffer, which has already been extracted
503                  * during XDR decode.
504                  */
505                 create->cr_linkname[create->cr_linklen] = 0;
506
507                 status = nfsd_symlink(rqstp, &cstate->current_fh,
508                                       create->cr_name, create->cr_namelen,
509                                       create->cr_linkname, create->cr_linklen,
510                                       &resfh, &create->cr_iattr);
511                 break;
512
513         case NF4BLK:
514                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
515                 if (MAJOR(rdev) != create->cr_specdata1 ||
516                     MINOR(rdev) != create->cr_specdata2)
517                         return nfserr_inval;
518                 status = nfsd_create(rqstp, &cstate->current_fh,
519                                      create->cr_name, create->cr_namelen,
520                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
521                 break;
522
523         case NF4CHR:
524                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
525                 if (MAJOR(rdev) != create->cr_specdata1 ||
526                     MINOR(rdev) != create->cr_specdata2)
527                         return nfserr_inval;
528                 status = nfsd_create(rqstp, &cstate->current_fh,
529                                      create->cr_name, create->cr_namelen,
530                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
531                 break;
532
533         case NF4SOCK:
534                 status = nfsd_create(rqstp, &cstate->current_fh,
535                                      create->cr_name, create->cr_namelen,
536                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
537                 break;
538
539         case NF4FIFO:
540                 status = nfsd_create(rqstp, &cstate->current_fh,
541                                      create->cr_name, create->cr_namelen,
542                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
543                 break;
544
545         case NF4DIR:
546                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
547                 status = nfsd_create(rqstp, &cstate->current_fh,
548                                      create->cr_name, create->cr_namelen,
549                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
550                 break;
551
552         default:
553                 status = nfserr_badtype;
554         }
555
556         if (status)
557                 goto out;
558
559         if (create->cr_acl != NULL)
560                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
561                                 create->cr_bmval);
562
563         fh_unlock(&cstate->current_fh);
564         set_change_info(&create->cr_cinfo, &cstate->current_fh);
565         fh_dup2(&cstate->current_fh, &resfh);
566 out:
567         fh_put(&resfh);
568         return status;
569 }
570
571 static __be32
572 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
573               struct nfsd4_getattr *getattr)
574 {
575         __be32 status;
576
577         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
578         if (status)
579                 return status;
580
581         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
582                 return nfserr_inval;
583
584         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
585         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
586         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
587
588         getattr->ga_fhp = &cstate->current_fh;
589         return nfs_ok;
590 }
591
592 static __be32
593 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
594            struct nfsd4_link *link)
595 {
596         __be32 status = nfserr_nofilehandle;
597
598         if (!cstate->save_fh.fh_dentry)
599                 return status;
600         status = nfsd_link(rqstp, &cstate->current_fh,
601                            link->li_name, link->li_namelen, &cstate->save_fh);
602         if (!status)
603                 set_change_info(&link->li_cinfo, &cstate->current_fh);
604         return status;
605 }
606
607 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
608 {
609         struct svc_fh tmp_fh;
610         __be32 ret;
611
612         fh_init(&tmp_fh, NFS4_FHSIZE);
613         ret = exp_pseudoroot(rqstp, &tmp_fh);
614         if (ret)
615                 return ret;
616         if (tmp_fh.fh_dentry == fh->fh_dentry) {
617                 fh_put(&tmp_fh);
618                 return nfserr_noent;
619         }
620         fh_put(&tmp_fh);
621         return nfsd_lookup(rqstp, fh, "..", 2, fh);
622 }
623
624 static __be32
625 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
626               void *arg)
627 {
628         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
629 }
630
631 static __be32
632 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
633              struct nfsd4_lookup *lookup)
634 {
635         return nfsd_lookup(rqstp, &cstate->current_fh,
636                            lookup->lo_name, lookup->lo_len,
637                            &cstate->current_fh);
638 }
639
640 static __be32
641 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
642            struct nfsd4_read *read)
643 {
644         __be32 status;
645
646         /* no need to check permission - this will be done in nfsd_read() */
647
648         read->rd_filp = NULL;
649         if (read->rd_offset >= OFFSET_MAX)
650                 return nfserr_inval;
651
652         nfs4_lock_state();
653         /* check stateid */
654         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
655                                                  RD_STATE, &read->rd_filp))) {
656                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
657                 goto out;
658         }
659         if (read->rd_filp)
660                 get_file(read->rd_filp);
661         status = nfs_ok;
662 out:
663         nfs4_unlock_state();
664         read->rd_rqstp = rqstp;
665         read->rd_fhp = &cstate->current_fh;
666         return status;
667 }
668
669 static __be32
670 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
671               struct nfsd4_readdir *readdir)
672 {
673         u64 cookie = readdir->rd_cookie;
674         static const nfs4_verifier zeroverf;
675
676         /* no need to check permission - this will be done in nfsd_readdir() */
677
678         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
679                 return nfserr_inval;
680
681         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
682         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
683         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
684
685         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
686             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
687                 return nfserr_bad_cookie;
688
689         readdir->rd_rqstp = rqstp;
690         readdir->rd_fhp = &cstate->current_fh;
691         return nfs_ok;
692 }
693
694 static __be32
695 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
696                struct nfsd4_readlink *readlink)
697 {
698         readlink->rl_rqstp = rqstp;
699         readlink->rl_fhp = &cstate->current_fh;
700         return nfs_ok;
701 }
702
703 static __be32
704 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
705              struct nfsd4_remove *remove)
706 {
707         __be32 status;
708
709         if (locks_in_grace())
710                 return nfserr_grace;
711         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
712                              remove->rm_name, remove->rm_namelen);
713         if (status == nfserr_symlink)
714                 return nfserr_notdir;
715         if (!status) {
716                 fh_unlock(&cstate->current_fh);
717                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
718         }
719         return status;
720 }
721
722 static __be32
723 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
724              struct nfsd4_rename *rename)
725 {
726         __be32 status = nfserr_nofilehandle;
727
728         if (!cstate->save_fh.fh_dentry)
729                 return status;
730         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
731                                         & NFSEXP_NOSUBTREECHECK))
732                 return nfserr_grace;
733         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
734                              rename->rn_snamelen, &cstate->current_fh,
735                              rename->rn_tname, rename->rn_tnamelen);
736
737         /* the underlying filesystem returns different error's than required
738          * by NFSv4. both save_fh and current_fh have been verified.. */
739         if (status == nfserr_isdir)
740                 status = nfserr_exist;
741         else if ((status == nfserr_notdir) &&
742                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
743                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
744                 status = nfserr_exist;
745         else if (status == nfserr_symlink)
746                 status = nfserr_notdir;
747
748         if (!status) {
749                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
750                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
751         }
752         return status;
753 }
754
755 static __be32
756 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
757               struct nfsd4_secinfo *secinfo)
758 {
759         struct svc_fh resfh;
760         struct svc_export *exp;
761         struct dentry *dentry;
762         __be32 err;
763
764         fh_init(&resfh, NFS4_FHSIZE);
765         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
766         if (err)
767                 return err;
768         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
769                                     secinfo->si_name, secinfo->si_namelen,
770                                     &exp, &dentry);
771         if (err)
772                 return err;
773         if (dentry->d_inode == NULL) {
774                 exp_put(exp);
775                 err = nfserr_noent;
776         } else
777                 secinfo->si_exp = exp;
778         dput(dentry);
779         if (cstate->minorversion)
780                 /* See rfc 5661 section 2.6.3.1.1.8 */
781                 fh_put(&cstate->current_fh);
782         return err;
783 }
784
785 static __be32
786 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
787               struct nfsd4_secinfo_no_name *sin)
788 {
789         __be32 err;
790
791         switch (sin->sin_style) {
792         case NFS4_SECINFO_STYLE4_CURRENT_FH:
793                 break;
794         case NFS4_SECINFO_STYLE4_PARENT:
795                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
796                 if (err)
797                         return err;
798                 break;
799         default:
800                 return nfserr_inval;
801         }
802         exp_get(cstate->current_fh.fh_export);
803         sin->sin_exp = cstate->current_fh.fh_export;
804         fh_put(&cstate->current_fh);
805         return nfs_ok;
806 }
807
808 static __be32
809 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
810               struct nfsd4_setattr *setattr)
811 {
812         __be32 status = nfs_ok;
813
814         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
815                 nfs4_lock_state();
816                 status = nfs4_preprocess_stateid_op(cstate,
817                         &setattr->sa_stateid, WR_STATE, NULL);
818                 nfs4_unlock_state();
819                 if (status) {
820                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
821                         return status;
822                 }
823         }
824         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
825         if (status)
826                 return status;
827         status = nfs_ok;
828
829         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
830                                     nfsd_attrmask);
831         if (status)
832                 goto out;
833
834         if (setattr->sa_acl != NULL)
835                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
836                                             setattr->sa_acl);
837         if (status)
838                 goto out;
839         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
840                                 0, (time_t)0);
841 out:
842         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
843         return status;
844 }
845
846 static __be32
847 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
848             struct nfsd4_write *write)
849 {
850         stateid_t *stateid = &write->wr_stateid;
851         struct file *filp = NULL;
852         u32 *p;
853         __be32 status = nfs_ok;
854         unsigned long cnt;
855
856         /* no need to check permission - this will be done in nfsd_write() */
857
858         if (write->wr_offset >= OFFSET_MAX)
859                 return nfserr_inval;
860
861         nfs4_lock_state();
862         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
863         if (filp)
864                 get_file(filp);
865         nfs4_unlock_state();
866
867         if (status) {
868                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
869                 return status;
870         }
871
872         cnt = write->wr_buflen;
873         write->wr_how_written = write->wr_stable_how;
874         p = (u32 *)write->wr_verifier.data;
875         *p++ = nfssvc_boot.tv_sec;
876         *p++ = nfssvc_boot.tv_usec;
877
878         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
879                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
880                              &cnt, &write->wr_how_written);
881         if (filp)
882                 fput(filp);
883
884         write->wr_bytes_written = cnt;
885
886         if (status == nfserr_symlink)
887                 status = nfserr_inval;
888         return status;
889 }
890
891 /* This routine never returns NFS_OK!  If there are no other errors, it
892  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
893  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
894  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
895  */
896 static __be32
897 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
898              struct nfsd4_verify *verify)
899 {
900         __be32 *buf, *p;
901         int count;
902         __be32 status;
903
904         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
905         if (status)
906                 return status;
907
908         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
909         if (status)
910                 return status;
911
912         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
913             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
914                 return nfserr_inval;
915         if (verify->ve_attrlen & 3)
916                 return nfserr_inval;
917
918         /* count in words:
919          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
920          */
921         count = 4 + (verify->ve_attrlen >> 2);
922         buf = kmalloc(count << 2, GFP_KERNEL);
923         if (!buf)
924                 return nfserr_resource;
925
926         status = nfsd4_encode_fattr(&cstate->current_fh,
927                                     cstate->current_fh.fh_export,
928                                     cstate->current_fh.fh_dentry, buf,
929                                     &count, verify->ve_bmval,
930                                     rqstp, 0);
931
932         /* this means that nfsd4_encode_fattr() ran out of space */
933         if (status == nfserr_resource && count == 0)
934                 status = nfserr_not_same;
935         if (status)
936                 goto out_kfree;
937
938         /* skip bitmap */
939         p = buf + 1 + ntohl(buf[0]);
940         status = nfserr_not_same;
941         if (ntohl(*p++) != verify->ve_attrlen)
942                 goto out_kfree;
943         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
944                 status = nfserr_same;
945
946 out_kfree:
947         kfree(buf);
948         return status;
949 }
950
951 static __be32
952 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
953               struct nfsd4_verify *verify)
954 {
955         __be32 status;
956
957         status = _nfsd4_verify(rqstp, cstate, verify);
958         return status == nfserr_not_same ? nfs_ok : status;
959 }
960
961 static __be32
962 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
963              struct nfsd4_verify *verify)
964 {
965         __be32 status;
966
967         status = _nfsd4_verify(rqstp, cstate, verify);
968         return status == nfserr_same ? nfs_ok : status;
969 }
970
971 /*
972  * NULL call.
973  */
974 static __be32
975 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
976 {
977         return nfs_ok;
978 }
979
980 static inline void nfsd4_increment_op_stats(u32 opnum)
981 {
982         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
983                 nfsdstats.nfs4_opcount[opnum]++;
984 }
985
986 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
987                               void *);
988 enum nfsd4_op_flags {
989         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
990         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
991         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
992         /* For rfc 5661 section 2.6.3.1.1: */
993         OP_HANDLES_WRONGSEC = 1 << 3,
994         OP_IS_PUTFH_LIKE = 1 << 4,
995 };
996
997 struct nfsd4_operation {
998         nfsd4op_func op_func;
999         u32 op_flags;
1000         char *op_name;
1001 };
1002
1003 static struct nfsd4_operation nfsd4_ops[];
1004
1005 static const char *nfsd4_op_name(unsigned opnum);
1006
1007 /*
1008  * Enforce NFSv4.1 COMPOUND ordering rules:
1009  *
1010  * Also note, enforced elsewhere:
1011  *      - SEQUENCE other than as first op results in
1012  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1013  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1014  *        (Enforced in nfsd4_bind_conn_to_session().)
1015  *      - DESTROY_SESSION must be the final operation in a compound, if
1016  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1017  *        (Enforced in nfsd4_destroy_session().)
1018  */
1019 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1020 {
1021         struct nfsd4_op *op = &args->ops[0];
1022
1023         /* These ordering requirements don't apply to NFSv4.0: */
1024         if (args->minorversion == 0)
1025                 return nfs_ok;
1026         /* This is weird, but OK, not our problem: */
1027         if (args->opcnt == 0)
1028                 return nfs_ok;
1029         if (op->status == nfserr_op_illegal)
1030                 return nfs_ok;
1031         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1032                 return nfserr_op_not_in_session;
1033         if (op->opnum == OP_SEQUENCE)
1034                 return nfs_ok;
1035         if (args->opcnt != 1)
1036                 return nfserr_not_only_op;
1037         return nfs_ok;
1038 }
1039
1040 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1041 {
1042         return &nfsd4_ops[op->opnum];
1043 }
1044
1045 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1046 {
1047         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1048         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1049         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1050         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1051         struct nfsd4_operation *thisd;
1052         struct nfsd4_operation *nextd;
1053
1054         thisd = OPDESC(this);
1055         /*
1056          * Most ops check wronsec on our own; only the putfh-like ops
1057          * have special rules.
1058          */
1059         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1060                 return false;
1061         /*
1062          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1063          * put-filehandle operation if we're not going to use the
1064          * result:
1065          */
1066         if (argp->opcnt == resp->opcnt)
1067                 return false;
1068
1069         nextd = OPDESC(next);
1070         /*
1071          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1072          * errors themselves as necessary; others should check for them
1073          * now:
1074          */
1075         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1076 }
1077
1078 /*
1079  * COMPOUND call.
1080  */
1081 static __be32
1082 nfsd4_proc_compound(struct svc_rqst *rqstp,
1083                     struct nfsd4_compoundargs *args,
1084                     struct nfsd4_compoundres *resp)
1085 {
1086         struct nfsd4_op *op;
1087         struct nfsd4_operation *opdesc;
1088         struct nfsd4_compound_state *cstate = &resp->cstate;
1089         int             slack_bytes;
1090         __be32          status;
1091
1092         resp->xbuf = &rqstp->rq_res;
1093         resp->p = rqstp->rq_res.head[0].iov_base +
1094                                                 rqstp->rq_res.head[0].iov_len;
1095         resp->tagp = resp->p;
1096         /* reserve space for: taglen, tag, and opcnt */
1097         resp->p += 2 + XDR_QUADLEN(args->taglen);
1098         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1099         resp->taglen = args->taglen;
1100         resp->tag = args->tag;
1101         resp->opcnt = 0;
1102         resp->rqstp = rqstp;
1103         resp->cstate.minorversion = args->minorversion;
1104         resp->cstate.replay_owner = NULL;
1105         resp->cstate.session = NULL;
1106         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1107         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1108         /*
1109          * Don't use the deferral mechanism for NFSv4; compounds make it
1110          * too hard to avoid non-idempotency problems.
1111          */
1112         rqstp->rq_usedeferral = 0;
1113
1114         /*
1115          * According to RFC3010, this takes precedence over all other errors.
1116          */
1117         status = nfserr_minor_vers_mismatch;
1118         if (args->minorversion > nfsd_supported_minorversion)
1119                 goto out;
1120
1121         status = nfs41_check_op_ordering(args);
1122         if (status) {
1123                 op = &args->ops[0];
1124                 op->status = status;
1125                 goto encode_op;
1126         }
1127
1128         while (!status && resp->opcnt < args->opcnt) {
1129                 op = &args->ops[resp->opcnt++];
1130
1131                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1132                         resp->opcnt, args->opcnt, op->opnum,
1133                         nfsd4_op_name(op->opnum));
1134                 /*
1135                  * The XDR decode routines may have pre-set op->status;
1136                  * for example, if there is a miscellaneous XDR error
1137                  * it will be set to nfserr_bad_xdr.
1138                  */
1139                 if (op->status)
1140                         goto encode_op;
1141
1142                 /* We must be able to encode a successful response to
1143                  * this operation, with enough room left over to encode a
1144                  * failed response to the next operation.  If we don't
1145                  * have enough room, fail with ERR_RESOURCE.
1146                  */
1147                 slack_bytes = (char *)resp->end - (char *)resp->p;
1148                 if (slack_bytes < COMPOUND_SLACK_SPACE
1149                                 + COMPOUND_ERR_SLACK_SPACE) {
1150                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1151                         op->status = nfserr_resource;
1152                         goto encode_op;
1153                 }
1154
1155                 opdesc = OPDESC(op);
1156
1157                 if (!cstate->current_fh.fh_dentry) {
1158                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1159                                 op->status = nfserr_nofilehandle;
1160                                 goto encode_op;
1161                         }
1162                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1163                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1164                         op->status = nfserr_moved;
1165                         goto encode_op;
1166                 }
1167
1168                 if (opdesc->op_func)
1169                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1170                 else
1171                         BUG_ON(op->status == nfs_ok);
1172
1173                 if (!op->status && need_wrongsec_check(rqstp))
1174                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1175
1176 encode_op:
1177                 /* Only from SEQUENCE */
1178                 if (resp->cstate.status == nfserr_replay_cache) {
1179                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1180                         status = op->status;
1181                         goto out;
1182                 }
1183                 if (op->status == nfserr_replay_me) {
1184                         op->replay = &cstate->replay_owner->so_replay;
1185                         nfsd4_encode_replay(resp, op);
1186                         status = op->status = op->replay->rp_status;
1187                 } else {
1188                         nfsd4_encode_operation(resp, op);
1189                         status = op->status;
1190                 }
1191
1192                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1193                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1194                         be32_to_cpu(status));
1195
1196                 if (cstate->replay_owner) {
1197                         nfs4_put_stateowner(cstate->replay_owner);
1198                         cstate->replay_owner = NULL;
1199                 }
1200                 /* XXX Ugh, we need to get rid of this kind of special case: */
1201                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1202                         fput(op->u.read.rd_filp);
1203
1204                 nfsd4_increment_op_stats(op->opnum);
1205         }
1206
1207         resp->cstate.status = status;
1208         fh_put(&resp->cstate.current_fh);
1209         fh_put(&resp->cstate.save_fh);
1210         BUG_ON(resp->cstate.replay_owner);
1211 out:
1212         nfsd4_release_compoundargs(args);
1213         /* Reset deferral mechanism for RPC deferrals */
1214         rqstp->rq_usedeferral = 1;
1215         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1216         return status;
1217 }
1218
1219 static struct nfsd4_operation nfsd4_ops[] = {
1220         [OP_ACCESS] = {
1221                 .op_func = (nfsd4op_func)nfsd4_access,
1222                 .op_name = "OP_ACCESS",
1223         },
1224         [OP_CLOSE] = {
1225                 .op_func = (nfsd4op_func)nfsd4_close,
1226                 .op_name = "OP_CLOSE",
1227         },
1228         [OP_COMMIT] = {
1229                 .op_func = (nfsd4op_func)nfsd4_commit,
1230                 .op_name = "OP_COMMIT",
1231         },
1232         [OP_CREATE] = {
1233                 .op_func = (nfsd4op_func)nfsd4_create,
1234                 .op_name = "OP_CREATE",
1235         },
1236         [OP_DELEGRETURN] = {
1237                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1238                 .op_name = "OP_DELEGRETURN",
1239         },
1240         [OP_GETATTR] = {
1241                 .op_func = (nfsd4op_func)nfsd4_getattr,
1242                 .op_flags = ALLOWED_ON_ABSENT_FS,
1243                 .op_name = "OP_GETATTR",
1244         },
1245         [OP_GETFH] = {
1246                 .op_func = (nfsd4op_func)nfsd4_getfh,
1247                 .op_name = "OP_GETFH",
1248         },
1249         [OP_LINK] = {
1250                 .op_func = (nfsd4op_func)nfsd4_link,
1251                 .op_name = "OP_LINK",
1252         },
1253         [OP_LOCK] = {
1254                 .op_func = (nfsd4op_func)nfsd4_lock,
1255                 .op_name = "OP_LOCK",
1256         },
1257         [OP_LOCKT] = {
1258                 .op_func = (nfsd4op_func)nfsd4_lockt,
1259                 .op_name = "OP_LOCKT",
1260         },
1261         [OP_LOCKU] = {
1262                 .op_func = (nfsd4op_func)nfsd4_locku,
1263                 .op_name = "OP_LOCKU",
1264         },
1265         [OP_LOOKUP] = {
1266                 .op_func = (nfsd4op_func)nfsd4_lookup,
1267                 .op_flags = OP_HANDLES_WRONGSEC,
1268                 .op_name = "OP_LOOKUP",
1269         },
1270         [OP_LOOKUPP] = {
1271                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1272                 .op_flags = OP_HANDLES_WRONGSEC,
1273                 .op_name = "OP_LOOKUPP",
1274         },
1275         [OP_NVERIFY] = {
1276                 .op_func = (nfsd4op_func)nfsd4_nverify,
1277                 .op_name = "OP_NVERIFY",
1278         },
1279         [OP_OPEN] = {
1280                 .op_func = (nfsd4op_func)nfsd4_open,
1281                 .op_flags = OP_HANDLES_WRONGSEC,
1282                 .op_name = "OP_OPEN",
1283         },
1284         [OP_OPEN_CONFIRM] = {
1285                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1286                 .op_name = "OP_OPEN_CONFIRM",
1287         },
1288         [OP_OPEN_DOWNGRADE] = {
1289                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1290                 .op_name = "OP_OPEN_DOWNGRADE",
1291         },
1292         [OP_PUTFH] = {
1293                 .op_func = (nfsd4op_func)nfsd4_putfh,
1294                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1295                                 | OP_IS_PUTFH_LIKE,
1296                 .op_name = "OP_PUTFH",
1297         },
1298         [OP_PUTPUBFH] = {
1299                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1300                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1301                                 | OP_IS_PUTFH_LIKE,
1302                 .op_name = "OP_PUTPUBFH",
1303         },
1304         [OP_PUTROOTFH] = {
1305                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1306                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1307                                 | OP_IS_PUTFH_LIKE,
1308                 .op_name = "OP_PUTROOTFH",
1309         },
1310         [OP_READ] = {
1311                 .op_func = (nfsd4op_func)nfsd4_read,
1312                 .op_name = "OP_READ",
1313         },
1314         [OP_READDIR] = {
1315                 .op_func = (nfsd4op_func)nfsd4_readdir,
1316                 .op_name = "OP_READDIR",
1317         },
1318         [OP_READLINK] = {
1319                 .op_func = (nfsd4op_func)nfsd4_readlink,
1320                 .op_name = "OP_READLINK",
1321         },
1322         [OP_REMOVE] = {
1323                 .op_func = (nfsd4op_func)nfsd4_remove,
1324                 .op_name = "OP_REMOVE",
1325         },
1326         [OP_RENAME] = {
1327                 .op_name = "OP_RENAME",
1328                 .op_func = (nfsd4op_func)nfsd4_rename,
1329         },
1330         [OP_RENEW] = {
1331                 .op_func = (nfsd4op_func)nfsd4_renew,
1332                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1333                 .op_name = "OP_RENEW",
1334         },
1335         [OP_RESTOREFH] = {
1336                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1337                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1338                                 | OP_IS_PUTFH_LIKE,
1339                 .op_name = "OP_RESTOREFH",
1340         },
1341         [OP_SAVEFH] = {
1342                 .op_func = (nfsd4op_func)nfsd4_savefh,
1343                 .op_flags = OP_HANDLES_WRONGSEC,
1344                 .op_name = "OP_SAVEFH",
1345         },
1346         [OP_SECINFO] = {
1347                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1348                 .op_flags = OP_HANDLES_WRONGSEC,
1349                 .op_name = "OP_SECINFO",
1350         },
1351         [OP_SETATTR] = {
1352                 .op_func = (nfsd4op_func)nfsd4_setattr,
1353                 .op_name = "OP_SETATTR",
1354         },
1355         [OP_SETCLIENTID] = {
1356                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1357                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1358                 .op_name = "OP_SETCLIENTID",
1359         },
1360         [OP_SETCLIENTID_CONFIRM] = {
1361                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1362                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1363                 .op_name = "OP_SETCLIENTID_CONFIRM",
1364         },
1365         [OP_VERIFY] = {
1366                 .op_func = (nfsd4op_func)nfsd4_verify,
1367                 .op_name = "OP_VERIFY",
1368         },
1369         [OP_WRITE] = {
1370                 .op_func = (nfsd4op_func)nfsd4_write,
1371                 .op_name = "OP_WRITE",
1372         },
1373         [OP_RELEASE_LOCKOWNER] = {
1374                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1375                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1376                 .op_name = "OP_RELEASE_LOCKOWNER",
1377         },
1378
1379         /* NFSv4.1 operations */
1380         [OP_EXCHANGE_ID] = {
1381                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1382                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1383                 .op_name = "OP_EXCHANGE_ID",
1384         },
1385         [OP_BIND_CONN_TO_SESSION] = {
1386                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1387                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1388                 .op_name = "OP_BIND_CONN_TO_SESSION",
1389         },
1390         [OP_CREATE_SESSION] = {
1391                 .op_func = (nfsd4op_func)nfsd4_create_session,
1392                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1393                 .op_name = "OP_CREATE_SESSION",
1394         },
1395         [OP_DESTROY_SESSION] = {
1396                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1397                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1398                 .op_name = "OP_DESTROY_SESSION",
1399         },
1400         [OP_SEQUENCE] = {
1401                 .op_func = (nfsd4op_func)nfsd4_sequence,
1402                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1403                 .op_name = "OP_SEQUENCE",
1404         },
1405         [OP_DESTROY_CLIENTID] = {
1406                 .op_func = NULL,
1407                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1408                 .op_name = "OP_DESTROY_CLIENTID",
1409         },
1410         [OP_RECLAIM_COMPLETE] = {
1411                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1412                 .op_flags = ALLOWED_WITHOUT_FH,
1413                 .op_name = "OP_RECLAIM_COMPLETE",
1414         },
1415         [OP_SECINFO_NO_NAME] = {
1416                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1417                 .op_flags = OP_HANDLES_WRONGSEC,
1418                 .op_name = "OP_SECINFO_NO_NAME",
1419         },
1420 };
1421
1422 static const char *nfsd4_op_name(unsigned opnum)
1423 {
1424         if (opnum < ARRAY_SIZE(nfsd4_ops))
1425                 return nfsd4_ops[opnum].op_name;
1426         return "unknown_operation";
1427 }
1428
1429 #define nfsd4_voidres                   nfsd4_voidargs
1430 struct nfsd4_voidargs { int dummy; };
1431
1432 /*
1433  * TODO: At the present time, the NFSv4 server does not do XID caching
1434  * of requests.  Implementing XID caching would not be a serious problem,
1435  * although it would require a mild change in interfaces since one
1436  * doesn't know whether an NFSv4 request is idempotent until after the
1437  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1438  * Astrand's regression testsuite for NFSv4 servers), which reuses
1439  * XID's liberally, so I've left it unimplemented until pynfs generates
1440  * better XID's.
1441  */
1442 static struct svc_procedure             nfsd_procedures4[2] = {
1443         [NFSPROC4_NULL] = {
1444                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1445                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1446                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1447                 .pc_ressize = sizeof(struct nfsd4_voidres),
1448                 .pc_cachetype = RC_NOCACHE,
1449                 .pc_xdrressize = 1,
1450         },
1451         [NFSPROC4_COMPOUND] = {
1452                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1453                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1454                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1455                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1456                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1457                 .pc_cachetype = RC_NOCACHE,
1458                 .pc_xdrressize = NFSD_BUFSIZE/4,
1459         },
1460 };
1461
1462 struct svc_version      nfsd_version4 = {
1463                 .vs_vers        = 4,
1464                 .vs_nproc       = 2,
1465                 .vs_proc        = nfsd_procedures4,
1466                 .vs_dispatch    = nfsd_dispatch,
1467                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1468 };
1469
1470 /*
1471  * Local variables:
1472  *  c-basic-offset: 8
1473  * End:
1474  */