nfsd: Use vfs_fsync_range() in nfsd_commit
[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
37 #include "cache.h"
38 #include "xdr4.h"
39 #include "vfs.h"
40
41 #define NFSDDBG_FACILITY                NFSDDBG_PROC
42
43 static u32 nfsd_attrmask[] = {
44         NFSD_WRITEABLE_ATTRS_WORD0,
45         NFSD_WRITEABLE_ATTRS_WORD1,
46         NFSD_WRITEABLE_ATTRS_WORD2
47 };
48
49 static u32 nfsd41_ex_attrmask[] = {
50         NFSD_SUPPATTR_EXCLCREAT_WORD0,
51         NFSD_SUPPATTR_EXCLCREAT_WORD1,
52         NFSD_SUPPATTR_EXCLCREAT_WORD2
53 };
54
55 static __be32
56 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
57                    u32 *bmval, u32 *writable)
58 {
59         struct dentry *dentry = cstate->current_fh.fh_dentry;
60
61         /*
62          * Check about attributes are supported by the NFSv4 server or not.
63          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
64          */
65         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
66             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
67             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
68                 return nfserr_attrnotsupp;
69
70         /*
71          * Check FATTR4_WORD0_ACL can be supported
72          * in current environment or not.
73          */
74         if (bmval[0] & FATTR4_WORD0_ACL) {
75                 if (!IS_POSIXACL(dentry->d_inode))
76                         return nfserr_attrnotsupp;
77         }
78
79         /*
80          * According to spec, read-only attributes return ERR_INVAL.
81          */
82         if (writable) {
83                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
84                     (bmval[2] & ~writable[2]))
85                         return nfserr_inval;
86         }
87
88         return nfs_ok;
89 }
90
91 static __be32
92 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
93         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
94 {
95         __be32 status = nfs_ok;
96
97         if (open->op_create == NFS4_OPEN_CREATE) {
98                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
99                     || open->op_createmode == NFS4_CREATE_GUARDED)
100                         status = check_attr_support(rqstp, cstate,
101                                         open->op_bmval, nfsd_attrmask);
102                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
103                         status = check_attr_support(rqstp, cstate,
104                                         open->op_bmval, nfsd41_ex_attrmask);
105         }
106
107         return status;
108 }
109
110 static int
111 is_create_with_attrs(struct nfsd4_open *open)
112 {
113         return open->op_create == NFS4_OPEN_CREATE
114                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
115                     || open->op_createmode == NFS4_CREATE_GUARDED
116                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
117 }
118
119 /*
120  * if error occurs when setting the acl, just clear the acl bit
121  * in the returned attr bitmap.
122  */
123 static void
124 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
125                 struct nfs4_acl *acl, u32 *bmval)
126 {
127         __be32 status;
128
129         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
130         if (status)
131                 /*
132                  * We should probably fail the whole open at this point,
133                  * but we've already created the file, so it's too late;
134                  * So this seems the least of evils:
135                  */
136                 bmval[0] &= ~FATTR4_WORD0_ACL;
137 }
138
139 static inline void
140 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
141 {
142         fh_put(dst);
143         dget(src->fh_dentry);
144         if (src->fh_export)
145                 cache_get(&src->fh_export->h);
146         *dst = *src;
147 }
148
149 static __be32
150 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
151 {
152         __be32 status;
153
154         if (open->op_truncate &&
155                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
156                 return nfserr_inval;
157
158         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
159                 accmode |= NFSD_MAY_READ;
160         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
161                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
162         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
163                 accmode |= NFSD_MAY_WRITE;
164
165         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
166
167         return status;
168 }
169
170 static __be32
171 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
172 {
173         struct svc_fh resfh;
174         __be32 status;
175         int created = 0;
176
177         fh_init(&resfh, NFS4_FHSIZE);
178         open->op_truncate = 0;
179
180         if (open->op_create) {
181                 /* FIXME: check session persistence and pnfs flags.
182                  * The nfsv4.1 spec requires the following semantics:
183                  *
184                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
185                  * Reply Cache  | server |                 |
186                  * -------------+--------+-----------------+--------------------
187                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
188                  *              |        |                 | (SHOULD)
189                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
190                  *              |        |                 | (SHOULD NOT)
191                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
192                  * yes          | no     | GUARDED4        | GUARDED4
193                  * yes          | yes    | GUARDED4        | GUARDED4
194                  */
195
196                 /*
197                  * Note: create modes (UNCHECKED,GUARDED...) are the same
198                  * in NFSv4 as in v3.
199                  */
200                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
201                                         open->op_fname.len, &open->op_iattr,
202                                         &resfh, open->op_createmode,
203                                         (u32 *)open->op_verf.data,
204                                         &open->op_truncate, &created);
205
206                 /*
207                  * Following rfc 3530 14.2.16, use the returned bitmask
208                  * to indicate which attributes we used to store the
209                  * verifier:
210                  */
211                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
212                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
213                                                 FATTR4_WORD1_TIME_MODIFY);
214         } else {
215                 status = nfsd_lookup(rqstp, current_fh,
216                                      open->op_fname.data, open->op_fname.len, &resfh);
217                 fh_unlock(current_fh);
218         }
219         if (status)
220                 goto out;
221
222         if (is_create_with_attrs(open) && open->op_acl != NULL)
223                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
224
225         set_change_info(&open->op_cinfo, current_fh);
226         fh_dup2(current_fh, &resfh);
227
228         /* set reply cache */
229         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
230                         &resfh.fh_handle);
231         if (!created)
232                 status = do_open_permission(rqstp, current_fh, open,
233                                             NFSD_MAY_NOP);
234
235 out:
236         fh_put(&resfh);
237         return status;
238 }
239
240 static __be32
241 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
242 {
243         __be32 status;
244
245         /* Only reclaims from previously confirmed clients are valid */
246         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
247                 return status;
248
249         /* We don't know the target directory, and therefore can not
250         * set the change info
251         */
252
253         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
254
255         /* set replay cache */
256         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
257                         &current_fh->fh_handle);
258
259         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
260                 (open->op_iattr.ia_size == 0);
261
262         status = do_open_permission(rqstp, current_fh, open,
263                                     NFSD_MAY_OWNER_OVERRIDE);
264
265         return status;
266 }
267
268 static void
269 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
270 {
271         struct nfsd4_sessionid *sid =
272                         (struct nfsd4_sessionid *)session->se_sessionid.data;
273
274         clid->cl_boot = sid->clientid.cl_boot;
275         clid->cl_id = sid->clientid.cl_id;
276 }
277
278 static __be32
279 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
280            struct nfsd4_open *open)
281 {
282         __be32 status;
283         struct nfsd4_compoundres *resp;
284
285         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
286                 (int)open->op_fname.len, open->op_fname.data,
287                 open->op_stateowner);
288
289         /* This check required by spec. */
290         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
291                 return nfserr_inval;
292
293         if (nfsd4_has_session(cstate))
294                 copy_clientid(&open->op_clientid, cstate->session);
295
296         nfs4_lock_state();
297
298         /* check seqid for replay. set nfs4_owner */
299         resp = rqstp->rq_resp;
300         status = nfsd4_process_open1(&resp->cstate, open);
301         if (status == nfserr_replay_me) {
302                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
303                 fh_put(&cstate->current_fh);
304                 fh_copy_shallow(&cstate->current_fh.fh_handle,
305                                 &rp->rp_openfh);
306                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
307                 if (status)
308                         dprintk("nfsd4_open: replay failed"
309                                 " restoring previous filehandle\n");
310                 else
311                         status = nfserr_replay_me;
312         }
313         if (status)
314                 goto out;
315
316         status = nfsd4_check_open_attributes(rqstp, cstate, open);
317         if (status)
318                 goto out;
319
320         /* Openowner is now set, so sequence id will get bumped.  Now we need
321          * these checks before we do any creates: */
322         status = nfserr_grace;
323         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
324                 goto out;
325         status = nfserr_no_grace;
326         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
327                 goto out;
328
329         switch (open->op_claim_type) {
330                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
331                 case NFS4_OPEN_CLAIM_NULL:
332                         /*
333                          * (1) set CURRENT_FH to the file being opened,
334                          * creating it if necessary, (2) set open->op_cinfo,
335                          * (3) set open->op_truncate if the file is to be
336                          * truncated after opening, (4) do permission checking.
337                          */
338                         status = do_open_lookup(rqstp, &cstate->current_fh,
339                                                 open);
340                         if (status)
341                                 goto out;
342                         break;
343                 case NFS4_OPEN_CLAIM_PREVIOUS:
344                         open->op_stateowner->so_confirmed = 1;
345                         /*
346                          * The CURRENT_FH is already set to the file being
347                          * opened.  (1) set open->op_cinfo, (2) set
348                          * open->op_truncate if the file is to be truncated
349                          * after opening, (3) do permission checking.
350                         */
351                         status = do_open_fhandle(rqstp, &cstate->current_fh,
352                                                  open);
353                         if (status)
354                                 goto out;
355                         break;
356                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
357                         open->op_stateowner->so_confirmed = 1;
358                         dprintk("NFSD: unsupported OPEN claim type %d\n",
359                                 open->op_claim_type);
360                         status = nfserr_notsupp;
361                         goto out;
362                 default:
363                         dprintk("NFSD: Invalid OPEN claim type %d\n",
364                                 open->op_claim_type);
365                         status = nfserr_inval;
366                         goto out;
367         }
368         /*
369          * nfsd4_process_open2() does the actual opening of the file.  If
370          * successful, it (1) truncates the file if open->op_truncate was
371          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
372          */
373         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
374 out:
375         if (open->op_stateowner) {
376                 nfs4_get_stateowner(open->op_stateowner);
377                 cstate->replay_owner = open->op_stateowner;
378         }
379         nfs4_unlock_state();
380         return status;
381 }
382
383 /*
384  * filehandle-manipulating ops.
385  */
386 static __be32
387 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
388             struct svc_fh **getfh)
389 {
390         if (!cstate->current_fh.fh_dentry)
391                 return nfserr_nofilehandle;
392
393         *getfh = &cstate->current_fh;
394         return nfs_ok;
395 }
396
397 static __be32
398 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
399             struct nfsd4_putfh *putfh)
400 {
401         fh_put(&cstate->current_fh);
402         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
403         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
404                putfh->pf_fhlen);
405         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
406 }
407
408 static __be32
409 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
410                 void *arg)
411 {
412         __be32 status;
413
414         fh_put(&cstate->current_fh);
415         status = exp_pseudoroot(rqstp, &cstate->current_fh);
416         return status;
417 }
418
419 static __be32
420 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
421                 void *arg)
422 {
423         if (!cstate->save_fh.fh_dentry)
424                 return nfserr_restorefh;
425
426         fh_dup2(&cstate->current_fh, &cstate->save_fh);
427         return nfs_ok;
428 }
429
430 static __be32
431 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
432              void *arg)
433 {
434         if (!cstate->current_fh.fh_dentry)
435                 return nfserr_nofilehandle;
436
437         fh_dup2(&cstate->save_fh, &cstate->current_fh);
438         return nfs_ok;
439 }
440
441 /*
442  * misc nfsv4 ops
443  */
444 static __be32
445 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
446              struct nfsd4_access *access)
447 {
448         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
449                 return nfserr_inval;
450
451         access->ac_resp_access = access->ac_req_access;
452         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
453                            &access->ac_supported);
454 }
455
456 static __be32
457 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
458              struct nfsd4_commit *commit)
459 {
460         __be32 status;
461
462         u32 *p = (u32 *)commit->co_verf.data;
463         *p++ = nfssvc_boot.tv_sec;
464         *p++ = nfssvc_boot.tv_usec;
465
466         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
467                              commit->co_count);
468         if (status == nfserr_symlink)
469                 status = nfserr_inval;
470         return status;
471 }
472
473 static __be32
474 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
475              struct nfsd4_create *create)
476 {
477         struct svc_fh resfh;
478         __be32 status;
479         dev_t rdev;
480
481         fh_init(&resfh, NFS4_FHSIZE);
482
483         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
484                            NFSD_MAY_CREATE);
485         if (status == nfserr_symlink)
486                 status = nfserr_notdir;
487         if (status)
488                 return status;
489
490         status = check_attr_support(rqstp, cstate, create->cr_bmval,
491                                     nfsd_attrmask);
492         if (status)
493                 return status;
494
495         switch (create->cr_type) {
496         case NF4LNK:
497                 /* ugh! we have to null-terminate the linktext, or
498                  * vfs_symlink() will choke.  it is always safe to
499                  * null-terminate by brute force, since at worst we
500                  * will overwrite the first byte of the create namelen
501                  * in the XDR buffer, which has already been extracted
502                  * during XDR decode.
503                  */
504                 create->cr_linkname[create->cr_linklen] = 0;
505
506                 status = nfsd_symlink(rqstp, &cstate->current_fh,
507                                       create->cr_name, create->cr_namelen,
508                                       create->cr_linkname, create->cr_linklen,
509                                       &resfh, &create->cr_iattr);
510                 break;
511
512         case NF4BLK:
513                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
514                 if (MAJOR(rdev) != create->cr_specdata1 ||
515                     MINOR(rdev) != create->cr_specdata2)
516                         return nfserr_inval;
517                 status = nfsd_create(rqstp, &cstate->current_fh,
518                                      create->cr_name, create->cr_namelen,
519                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
520                 break;
521
522         case NF4CHR:
523                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
524                 if (MAJOR(rdev) != create->cr_specdata1 ||
525                     MINOR(rdev) != create->cr_specdata2)
526                         return nfserr_inval;
527                 status = nfsd_create(rqstp, &cstate->current_fh,
528                                      create->cr_name, create->cr_namelen,
529                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
530                 break;
531
532         case NF4SOCK:
533                 status = nfsd_create(rqstp, &cstate->current_fh,
534                                      create->cr_name, create->cr_namelen,
535                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
536                 break;
537
538         case NF4FIFO:
539                 status = nfsd_create(rqstp, &cstate->current_fh,
540                                      create->cr_name, create->cr_namelen,
541                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
542                 break;
543
544         case NF4DIR:
545                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
546                 status = nfsd_create(rqstp, &cstate->current_fh,
547                                      create->cr_name, create->cr_namelen,
548                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
549                 break;
550
551         default:
552                 status = nfserr_badtype;
553         }
554
555         if (status)
556                 goto out;
557
558         if (create->cr_acl != NULL)
559                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
560                                 create->cr_bmval);
561
562         fh_unlock(&cstate->current_fh);
563         set_change_info(&create->cr_cinfo, &cstate->current_fh);
564         fh_dup2(&cstate->current_fh, &resfh);
565 out:
566         fh_put(&resfh);
567         return status;
568 }
569
570 static __be32
571 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
572               struct nfsd4_getattr *getattr)
573 {
574         __be32 status;
575
576         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
577         if (status)
578                 return status;
579
580         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
581                 return nfserr_inval;
582
583         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
584         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
585         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
586
587         getattr->ga_fhp = &cstate->current_fh;
588         return nfs_ok;
589 }
590
591 static __be32
592 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
593            struct nfsd4_link *link)
594 {
595         __be32 status = nfserr_nofilehandle;
596
597         if (!cstate->save_fh.fh_dentry)
598                 return status;
599         status = nfsd_link(rqstp, &cstate->current_fh,
600                            link->li_name, link->li_namelen, &cstate->save_fh);
601         if (!status)
602                 set_change_info(&link->li_cinfo, &cstate->current_fh);
603         return status;
604 }
605
606 static __be32
607 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
608               void *arg)
609 {
610         struct svc_fh tmp_fh;
611         __be32 ret;
612
613         fh_init(&tmp_fh, NFS4_FHSIZE);
614         ret = exp_pseudoroot(rqstp, &tmp_fh);
615         if (ret)
616                 return ret;
617         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
618                 fh_put(&tmp_fh);
619                 return nfserr_noent;
620         }
621         fh_put(&tmp_fh);
622         return nfsd_lookup(rqstp, &cstate->current_fh,
623                            "..", 2, &cstate->current_fh);
624 }
625
626 static __be32
627 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
628              struct nfsd4_lookup *lookup)
629 {
630         return nfsd_lookup(rqstp, &cstate->current_fh,
631                            lookup->lo_name, lookup->lo_len,
632                            &cstate->current_fh);
633 }
634
635 static __be32
636 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
637            struct nfsd4_read *read)
638 {
639         __be32 status;
640
641         /* no need to check permission - this will be done in nfsd_read() */
642
643         read->rd_filp = NULL;
644         if (read->rd_offset >= OFFSET_MAX)
645                 return nfserr_inval;
646
647         nfs4_lock_state();
648         /* check stateid */
649         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
650                                                  RD_STATE, &read->rd_filp))) {
651                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
652                 goto out;
653         }
654         if (read->rd_filp)
655                 get_file(read->rd_filp);
656         status = nfs_ok;
657 out:
658         nfs4_unlock_state();
659         read->rd_rqstp = rqstp;
660         read->rd_fhp = &cstate->current_fh;
661         return status;
662 }
663
664 static __be32
665 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
666               struct nfsd4_readdir *readdir)
667 {
668         u64 cookie = readdir->rd_cookie;
669         static const nfs4_verifier zeroverf;
670
671         /* no need to check permission - this will be done in nfsd_readdir() */
672
673         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
674                 return nfserr_inval;
675
676         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
677         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
678         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
679
680         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
681             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
682                 return nfserr_bad_cookie;
683
684         readdir->rd_rqstp = rqstp;
685         readdir->rd_fhp = &cstate->current_fh;
686         return nfs_ok;
687 }
688
689 static __be32
690 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
691                struct nfsd4_readlink *readlink)
692 {
693         readlink->rl_rqstp = rqstp;
694         readlink->rl_fhp = &cstate->current_fh;
695         return nfs_ok;
696 }
697
698 static __be32
699 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
700              struct nfsd4_remove *remove)
701 {
702         __be32 status;
703
704         if (locks_in_grace())
705                 return nfserr_grace;
706         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
707                              remove->rm_name, remove->rm_namelen);
708         if (status == nfserr_symlink)
709                 return nfserr_notdir;
710         if (!status) {
711                 fh_unlock(&cstate->current_fh);
712                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
713         }
714         return status;
715 }
716
717 static __be32
718 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
719              struct nfsd4_rename *rename)
720 {
721         __be32 status = nfserr_nofilehandle;
722
723         if (!cstate->save_fh.fh_dentry)
724                 return status;
725         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
726                                         & NFSEXP_NOSUBTREECHECK))
727                 return nfserr_grace;
728         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
729                              rename->rn_snamelen, &cstate->current_fh,
730                              rename->rn_tname, rename->rn_tnamelen);
731
732         /* the underlying filesystem returns different error's than required
733          * by NFSv4. both save_fh and current_fh have been verified.. */
734         if (status == nfserr_isdir)
735                 status = nfserr_exist;
736         else if ((status == nfserr_notdir) &&
737                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
738                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
739                 status = nfserr_exist;
740         else if (status == nfserr_symlink)
741                 status = nfserr_notdir;
742
743         if (!status) {
744                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
745                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
746         }
747         return status;
748 }
749
750 static __be32
751 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
752               struct nfsd4_secinfo *secinfo)
753 {
754         struct svc_fh resfh;
755         struct svc_export *exp;
756         struct dentry *dentry;
757         __be32 err;
758
759         fh_init(&resfh, NFS4_FHSIZE);
760         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
761                                     secinfo->si_name, secinfo->si_namelen,
762                                     &exp, &dentry);
763         if (err)
764                 return err;
765         if (dentry->d_inode == NULL) {
766                 exp_put(exp);
767                 err = nfserr_noent;
768         } else
769                 secinfo->si_exp = exp;
770         dput(dentry);
771         return err;
772 }
773
774 static __be32
775 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
776               struct nfsd4_setattr *setattr)
777 {
778         __be32 status = nfs_ok;
779
780         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
781                 nfs4_lock_state();
782                 status = nfs4_preprocess_stateid_op(cstate,
783                         &setattr->sa_stateid, WR_STATE, NULL);
784                 nfs4_unlock_state();
785                 if (status) {
786                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
787                         return status;
788                 }
789         }
790         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
791         if (status)
792                 return status;
793         status = nfs_ok;
794
795         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
796                                     nfsd_attrmask);
797         if (status)
798                 goto out;
799
800         if (setattr->sa_acl != NULL)
801                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
802                                             setattr->sa_acl);
803         if (status)
804                 goto out;
805         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
806                                 0, (time_t)0);
807 out:
808         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
809         return status;
810 }
811
812 static __be32
813 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
814             struct nfsd4_write *write)
815 {
816         stateid_t *stateid = &write->wr_stateid;
817         struct file *filp = NULL;
818         u32 *p;
819         __be32 status = nfs_ok;
820         unsigned long cnt;
821
822         /* no need to check permission - this will be done in nfsd_write() */
823
824         if (write->wr_offset >= OFFSET_MAX)
825                 return nfserr_inval;
826
827         nfs4_lock_state();
828         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
829         if (filp)
830                 get_file(filp);
831         nfs4_unlock_state();
832
833         if (status) {
834                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
835                 return status;
836         }
837
838         cnt = write->wr_buflen;
839         write->wr_how_written = write->wr_stable_how;
840         p = (u32 *)write->wr_verifier.data;
841         *p++ = nfssvc_boot.tv_sec;
842         *p++ = nfssvc_boot.tv_usec;
843
844         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
845                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
846                              &cnt, &write->wr_how_written);
847         if (filp)
848                 fput(filp);
849
850         write->wr_bytes_written = cnt;
851
852         if (status == nfserr_symlink)
853                 status = nfserr_inval;
854         return status;
855 }
856
857 /* This routine never returns NFS_OK!  If there are no other errors, it
858  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
859  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
860  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
861  */
862 static __be32
863 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
864              struct nfsd4_verify *verify)
865 {
866         __be32 *buf, *p;
867         int count;
868         __be32 status;
869
870         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
871         if (status)
872                 return status;
873
874         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
875         if (status)
876                 return status;
877
878         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
879             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
880                 return nfserr_inval;
881         if (verify->ve_attrlen & 3)
882                 return nfserr_inval;
883
884         /* count in words:
885          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
886          */
887         count = 4 + (verify->ve_attrlen >> 2);
888         buf = kmalloc(count << 2, GFP_KERNEL);
889         if (!buf)
890                 return nfserr_resource;
891
892         status = nfsd4_encode_fattr(&cstate->current_fh,
893                                     cstate->current_fh.fh_export,
894                                     cstate->current_fh.fh_dentry, buf,
895                                     &count, verify->ve_bmval,
896                                     rqstp, 0);
897
898         /* this means that nfsd4_encode_fattr() ran out of space */
899         if (status == nfserr_resource && count == 0)
900                 status = nfserr_not_same;
901         if (status)
902                 goto out_kfree;
903
904         /* skip bitmap */
905         p = buf + 1 + ntohl(buf[0]);
906         status = nfserr_not_same;
907         if (ntohl(*p++) != verify->ve_attrlen)
908                 goto out_kfree;
909         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
910                 status = nfserr_same;
911
912 out_kfree:
913         kfree(buf);
914         return status;
915 }
916
917 static __be32
918 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
919               struct nfsd4_verify *verify)
920 {
921         __be32 status;
922
923         status = _nfsd4_verify(rqstp, cstate, verify);
924         return status == nfserr_not_same ? nfs_ok : status;
925 }
926
927 static __be32
928 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
929              struct nfsd4_verify *verify)
930 {
931         __be32 status;
932
933         status = _nfsd4_verify(rqstp, cstate, verify);
934         return status == nfserr_same ? nfs_ok : status;
935 }
936
937 /*
938  * NULL call.
939  */
940 static __be32
941 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
942 {
943         return nfs_ok;
944 }
945
946 static inline void nfsd4_increment_op_stats(u32 opnum)
947 {
948         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
949                 nfsdstats.nfs4_opcount[opnum]++;
950 }
951
952 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
953                               void *);
954 enum nfsd4_op_flags {
955         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
956         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
957         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
958 };
959
960 struct nfsd4_operation {
961         nfsd4op_func op_func;
962         u32 op_flags;
963         char *op_name;
964 };
965
966 static struct nfsd4_operation nfsd4_ops[];
967
968 static const char *nfsd4_op_name(unsigned opnum);
969
970 /*
971  * Enforce NFSv4.1 COMPOUND ordering rules.
972  *
973  * TODO:
974  * - enforce NFS4ERR_NOT_ONLY_OP,
975  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
976  */
977 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
978 {
979         if (args->minorversion && args->opcnt > 0) {
980                 struct nfsd4_op *op = &args->ops[0];
981                 return (op->status == nfserr_op_illegal) ||
982                        (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
983         }
984         return true;
985 }
986
987 /*
988  * COMPOUND call.
989  */
990 static __be32
991 nfsd4_proc_compound(struct svc_rqst *rqstp,
992                     struct nfsd4_compoundargs *args,
993                     struct nfsd4_compoundres *resp)
994 {
995         struct nfsd4_op *op;
996         struct nfsd4_operation *opdesc;
997         struct nfsd4_compound_state *cstate = &resp->cstate;
998         int             slack_bytes;
999         __be32          status;
1000
1001         resp->xbuf = &rqstp->rq_res;
1002         resp->p = rqstp->rq_res.head[0].iov_base +
1003                                                 rqstp->rq_res.head[0].iov_len;
1004         resp->tagp = resp->p;
1005         /* reserve space for: taglen, tag, and opcnt */
1006         resp->p += 2 + XDR_QUADLEN(args->taglen);
1007         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1008         resp->taglen = args->taglen;
1009         resp->tag = args->tag;
1010         resp->opcnt = 0;
1011         resp->rqstp = rqstp;
1012         resp->cstate.minorversion = args->minorversion;
1013         resp->cstate.replay_owner = NULL;
1014         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1015         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1016         /* Use the deferral mechanism only for NFSv4.0 compounds */
1017         rqstp->rq_usedeferral = (args->minorversion == 0);
1018
1019         /*
1020          * According to RFC3010, this takes precedence over all other errors.
1021          */
1022         status = nfserr_minor_vers_mismatch;
1023         if (args->minorversion > nfsd_supported_minorversion)
1024                 goto out;
1025
1026         if (!nfs41_op_ordering_ok(args)) {
1027                 op = &args->ops[0];
1028                 op->status = nfserr_sequence_pos;
1029                 goto encode_op;
1030         }
1031
1032         status = nfs_ok;
1033         while (!status && resp->opcnt < args->opcnt) {
1034                 op = &args->ops[resp->opcnt++];
1035
1036                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1037                         resp->opcnt, args->opcnt, op->opnum,
1038                         nfsd4_op_name(op->opnum));
1039                 /*
1040                  * The XDR decode routines may have pre-set op->status;
1041                  * for example, if there is a miscellaneous XDR error
1042                  * it will be set to nfserr_bad_xdr.
1043                  */
1044                 if (op->status)
1045                         goto encode_op;
1046
1047                 /* We must be able to encode a successful response to
1048                  * this operation, with enough room left over to encode a
1049                  * failed response to the next operation.  If we don't
1050                  * have enough room, fail with ERR_RESOURCE.
1051                  */
1052                 slack_bytes = (char *)resp->end - (char *)resp->p;
1053                 if (slack_bytes < COMPOUND_SLACK_SPACE
1054                                 + COMPOUND_ERR_SLACK_SPACE) {
1055                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1056                         op->status = nfserr_resource;
1057                         goto encode_op;
1058                 }
1059
1060                 opdesc = &nfsd4_ops[op->opnum];
1061
1062                 if (!cstate->current_fh.fh_dentry) {
1063                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1064                                 op->status = nfserr_nofilehandle;
1065                                 goto encode_op;
1066                         }
1067                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1068                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1069                         op->status = nfserr_moved;
1070                         goto encode_op;
1071                 }
1072
1073                 if (opdesc->op_func)
1074                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1075                 else
1076                         BUG_ON(op->status == nfs_ok);
1077
1078 encode_op:
1079                 /* Only from SEQUENCE */
1080                 if (resp->cstate.status == nfserr_replay_cache) {
1081                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1082                         status = op->status;
1083                         goto out;
1084                 }
1085                 if (op->status == nfserr_replay_me) {
1086                         op->replay = &cstate->replay_owner->so_replay;
1087                         nfsd4_encode_replay(resp, op);
1088                         status = op->status = op->replay->rp_status;
1089                 } else {
1090                         nfsd4_encode_operation(resp, op);
1091                         status = op->status;
1092                 }
1093
1094                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1095                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1096                         be32_to_cpu(status));
1097
1098                 if (cstate->replay_owner) {
1099                         nfs4_put_stateowner(cstate->replay_owner);
1100                         cstate->replay_owner = NULL;
1101                 }
1102                 /* XXX Ugh, we need to get rid of this kind of special case: */
1103                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1104                         fput(op->u.read.rd_filp);
1105
1106                 nfsd4_increment_op_stats(op->opnum);
1107         }
1108         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1109                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1110                 status = nfserr_jukebox;
1111         }
1112
1113         resp->cstate.status = status;
1114         fh_put(&resp->cstate.current_fh);
1115         fh_put(&resp->cstate.save_fh);
1116         BUG_ON(resp->cstate.replay_owner);
1117 out:
1118         nfsd4_release_compoundargs(args);
1119         /* Reset deferral mechanism for RPC deferrals */
1120         rqstp->rq_usedeferral = 1;
1121         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1122         return status;
1123 }
1124
1125 static struct nfsd4_operation nfsd4_ops[] = {
1126         [OP_ACCESS] = {
1127                 .op_func = (nfsd4op_func)nfsd4_access,
1128                 .op_name = "OP_ACCESS",
1129         },
1130         [OP_CLOSE] = {
1131                 .op_func = (nfsd4op_func)nfsd4_close,
1132                 .op_name = "OP_CLOSE",
1133         },
1134         [OP_COMMIT] = {
1135                 .op_func = (nfsd4op_func)nfsd4_commit,
1136                 .op_name = "OP_COMMIT",
1137         },
1138         [OP_CREATE] = {
1139                 .op_func = (nfsd4op_func)nfsd4_create,
1140                 .op_name = "OP_CREATE",
1141         },
1142         [OP_DELEGRETURN] = {
1143                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1144                 .op_name = "OP_DELEGRETURN",
1145         },
1146         [OP_GETATTR] = {
1147                 .op_func = (nfsd4op_func)nfsd4_getattr,
1148                 .op_flags = ALLOWED_ON_ABSENT_FS,
1149                 .op_name = "OP_GETATTR",
1150         },
1151         [OP_GETFH] = {
1152                 .op_func = (nfsd4op_func)nfsd4_getfh,
1153                 .op_name = "OP_GETFH",
1154         },
1155         [OP_LINK] = {
1156                 .op_func = (nfsd4op_func)nfsd4_link,
1157                 .op_name = "OP_LINK",
1158         },
1159         [OP_LOCK] = {
1160                 .op_func = (nfsd4op_func)nfsd4_lock,
1161                 .op_name = "OP_LOCK",
1162         },
1163         [OP_LOCKT] = {
1164                 .op_func = (nfsd4op_func)nfsd4_lockt,
1165                 .op_name = "OP_LOCKT",
1166         },
1167         [OP_LOCKU] = {
1168                 .op_func = (nfsd4op_func)nfsd4_locku,
1169                 .op_name = "OP_LOCKU",
1170         },
1171         [OP_LOOKUP] = {
1172                 .op_func = (nfsd4op_func)nfsd4_lookup,
1173                 .op_name = "OP_LOOKUP",
1174         },
1175         [OP_LOOKUPP] = {
1176                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1177                 .op_name = "OP_LOOKUPP",
1178         },
1179         [OP_NVERIFY] = {
1180                 .op_func = (nfsd4op_func)nfsd4_nverify,
1181                 .op_name = "OP_NVERIFY",
1182         },
1183         [OP_OPEN] = {
1184                 .op_func = (nfsd4op_func)nfsd4_open,
1185                 .op_name = "OP_OPEN",
1186         },
1187         [OP_OPEN_CONFIRM] = {
1188                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1189                 .op_name = "OP_OPEN_CONFIRM",
1190         },
1191         [OP_OPEN_DOWNGRADE] = {
1192                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1193                 .op_name = "OP_OPEN_DOWNGRADE",
1194         },
1195         [OP_PUTFH] = {
1196                 .op_func = (nfsd4op_func)nfsd4_putfh,
1197                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1198                 .op_name = "OP_PUTFH",
1199         },
1200         [OP_PUTPUBFH] = {
1201                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1202                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1203                 .op_name = "OP_PUTPUBFH",
1204         },
1205         [OP_PUTROOTFH] = {
1206                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1207                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1208                 .op_name = "OP_PUTROOTFH",
1209         },
1210         [OP_READ] = {
1211                 .op_func = (nfsd4op_func)nfsd4_read,
1212                 .op_name = "OP_READ",
1213         },
1214         [OP_READDIR] = {
1215                 .op_func = (nfsd4op_func)nfsd4_readdir,
1216                 .op_name = "OP_READDIR",
1217         },
1218         [OP_READLINK] = {
1219                 .op_func = (nfsd4op_func)nfsd4_readlink,
1220                 .op_name = "OP_READLINK",
1221         },
1222         [OP_REMOVE] = {
1223                 .op_func = (nfsd4op_func)nfsd4_remove,
1224                 .op_name = "OP_REMOVE",
1225         },
1226         [OP_RENAME] = {
1227                 .op_name = "OP_RENAME",
1228                 .op_func = (nfsd4op_func)nfsd4_rename,
1229         },
1230         [OP_RENEW] = {
1231                 .op_func = (nfsd4op_func)nfsd4_renew,
1232                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1233                 .op_name = "OP_RENEW",
1234         },
1235         [OP_RESTOREFH] = {
1236                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1237                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1238                 .op_name = "OP_RESTOREFH",
1239         },
1240         [OP_SAVEFH] = {
1241                 .op_func = (nfsd4op_func)nfsd4_savefh,
1242                 .op_name = "OP_SAVEFH",
1243         },
1244         [OP_SECINFO] = {
1245                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1246                 .op_name = "OP_SECINFO",
1247         },
1248         [OP_SETATTR] = {
1249                 .op_func = (nfsd4op_func)nfsd4_setattr,
1250                 .op_name = "OP_SETATTR",
1251         },
1252         [OP_SETCLIENTID] = {
1253                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1254                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1255                 .op_name = "OP_SETCLIENTID",
1256         },
1257         [OP_SETCLIENTID_CONFIRM] = {
1258                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1259                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1260                 .op_name = "OP_SETCLIENTID_CONFIRM",
1261         },
1262         [OP_VERIFY] = {
1263                 .op_func = (nfsd4op_func)nfsd4_verify,
1264                 .op_name = "OP_VERIFY",
1265         },
1266         [OP_WRITE] = {
1267                 .op_func = (nfsd4op_func)nfsd4_write,
1268                 .op_name = "OP_WRITE",
1269         },
1270         [OP_RELEASE_LOCKOWNER] = {
1271                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1272                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1273                 .op_name = "OP_RELEASE_LOCKOWNER",
1274         },
1275
1276         /* NFSv4.1 operations */
1277         [OP_EXCHANGE_ID] = {
1278                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1279                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1280                 .op_name = "OP_EXCHANGE_ID",
1281         },
1282         [OP_CREATE_SESSION] = {
1283                 .op_func = (nfsd4op_func)nfsd4_create_session,
1284                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1285                 .op_name = "OP_CREATE_SESSION",
1286         },
1287         [OP_DESTROY_SESSION] = {
1288                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1289                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1290                 .op_name = "OP_DESTROY_SESSION",
1291         },
1292         [OP_SEQUENCE] = {
1293                 .op_func = (nfsd4op_func)nfsd4_sequence,
1294                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1295                 .op_name = "OP_SEQUENCE",
1296         },
1297 };
1298
1299 static const char *nfsd4_op_name(unsigned opnum)
1300 {
1301         if (opnum < ARRAY_SIZE(nfsd4_ops))
1302                 return nfsd4_ops[opnum].op_name;
1303         return "unknown_operation";
1304 }
1305
1306 #define nfsd4_voidres                   nfsd4_voidargs
1307 struct nfsd4_voidargs { int dummy; };
1308
1309 /*
1310  * TODO: At the present time, the NFSv4 server does not do XID caching
1311  * of requests.  Implementing XID caching would not be a serious problem,
1312  * although it would require a mild change in interfaces since one
1313  * doesn't know whether an NFSv4 request is idempotent until after the
1314  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1315  * Astrand's regression testsuite for NFSv4 servers), which reuses
1316  * XID's liberally, so I've left it unimplemented until pynfs generates
1317  * better XID's.
1318  */
1319 static struct svc_procedure             nfsd_procedures4[2] = {
1320         [NFSPROC4_NULL] = {
1321                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1322                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1323                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1324                 .pc_ressize = sizeof(struct nfsd4_voidres),
1325                 .pc_cachetype = RC_NOCACHE,
1326                 .pc_xdrressize = 1,
1327         },
1328         [NFSPROC4_COMPOUND] = {
1329                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1330                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1331                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1332                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1333                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1334                 .pc_cachetype = RC_NOCACHE,
1335                 .pc_xdrressize = NFSD_BUFSIZE/4,
1336         },
1337 };
1338
1339 struct svc_version      nfsd_version4 = {
1340                 .vs_vers        = 4,
1341                 .vs_nproc       = 2,
1342                 .vs_proc        = nfsd_procedures4,
1343                 .vs_dispatch    = nfsd_dispatch,
1344                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1345 };
1346
1347 /*
1348  * Local variables:
1349  *  c-basic-offset: 8
1350  * End:
1351  */