Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / fs / nfsd / nfs4proc.c
1 /*
2  *  fs/nfsd/nfs4proc.c
3  *
4  *  Server-side procedures for NFSv4.
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *  Andy Adamson   <andros@umich.edu>
11  *
12  *  Redistribution and use in source and binary forms, with or without
13  *  modification, are permitted provided that the following conditions
14  *  are met:
15  *
16  *  1. Redistributions of source code must retain the above copyright
17  *     notice, this list of conditions and the following disclaimer.
18  *  2. Redistributions in binary form must reproduce the above copyright
19  *     notice, this list of conditions and the following disclaimer in the
20  *     documentation and/or other materials provided with the distribution.
21  *  3. Neither the name of the University nor the names of its
22  *     contributors may be used to endorse or promote products derived
23  *     from this software without specific prior written permission.
24  *
25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37
38 #include <linux/param.h>
39 #include <linux/major.h>
40 #include <linux/slab.h>
41 #include <linux/file.h>
42
43 #include <linux/sunrpc/svc.h>
44 #include <linux/nfsd/nfsd.h>
45 #include <linux/nfsd/cache.h>
46 #include <linux/nfs4.h>
47 #include <linux/nfsd/state.h>
48 #include <linux/nfsd/xdr4.h>
49 #include <linux/nfs4_acl.h>
50 #include <linux/sunrpc/gss_api.h>
51
52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
53
54 static inline void
55 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
56 {
57         fh_put(dst);
58         dget(src->fh_dentry);
59         if (src->fh_export)
60                 cache_get(&src->fh_export->h);
61         *dst = *src;
62 }
63
64 static __be32
65 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
66 {
67         __be32 status;
68
69         if (open->op_truncate &&
70                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
71                 return nfserr_inval;
72
73         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
74                 accmode |= NFSD_MAY_READ;
75         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
76                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
77         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
78                 accmode |= NFSD_MAY_WRITE;
79
80         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
81
82         return status;
83 }
84
85 static __be32
86 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
87 {
88         struct svc_fh resfh;
89         __be32 status;
90         int created = 0;
91
92         fh_init(&resfh, NFS4_FHSIZE);
93         open->op_truncate = 0;
94
95         if (open->op_create) {
96                 /*
97                  * Note: create modes (UNCHECKED,GUARDED...) are the same
98                  * in NFSv4 as in v3.
99                  */
100                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
101                                         open->op_fname.len, &open->op_iattr,
102                                         &resfh, open->op_createmode,
103                                         (u32 *)open->op_verf.data,
104                                         &open->op_truncate, &created);
105
106                 /* If we ever decide to use different attrs to store the
107                  * verifier in nfsd_create_v3, then we'll need to change this
108                  */
109                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
110                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
111                                                 FATTR4_WORD1_TIME_MODIFY);
112         } else {
113                 status = nfsd_lookup(rqstp, current_fh,
114                                      open->op_fname.data, open->op_fname.len, &resfh);
115                 fh_unlock(current_fh);
116         }
117         if (status)
118                 goto out;
119
120         set_change_info(&open->op_cinfo, current_fh);
121
122         /* set reply cache */
123         fh_dup2(current_fh, &resfh);
124         open->op_stateowner->so_replay.rp_openfh_len = resfh.fh_handle.fh_size;
125         memcpy(open->op_stateowner->so_replay.rp_openfh,
126                         &resfh.fh_handle.fh_base, resfh.fh_handle.fh_size);
127
128         if (!created)
129                 status = do_open_permission(rqstp, current_fh, open,
130                                             NFSD_MAY_NOP);
131
132 out:
133         fh_put(&resfh);
134         return status;
135 }
136
137 static __be32
138 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
139 {
140         __be32 status;
141
142         /* Only reclaims from previously confirmed clients are valid */
143         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
144                 return status;
145
146         /* We don't know the target directory, and therefore can not
147         * set the change info
148         */
149
150         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
151
152         /* set replay cache */
153         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
154         memcpy(open->op_stateowner->so_replay.rp_openfh,
155                 &current_fh->fh_handle.fh_base,
156                 current_fh->fh_handle.fh_size);
157
158         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
159                 (open->op_iattr.ia_size == 0);
160
161         status = do_open_permission(rqstp, current_fh, open,
162                                     NFSD_MAY_OWNER_OVERRIDE);
163
164         return status;
165 }
166
167
168 static __be32
169 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
170            struct nfsd4_open *open)
171 {
172         __be32 status;
173         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
174                 (int)open->op_fname.len, open->op_fname.data,
175                 open->op_stateowner);
176
177         /* This check required by spec. */
178         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
179                 return nfserr_inval;
180
181         nfs4_lock_state();
182
183         /* check seqid for replay. set nfs4_owner */
184         status = nfsd4_process_open1(open);
185         if (status == nfserr_replay_me) {
186                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
187                 fh_put(&cstate->current_fh);
188                 cstate->current_fh.fh_handle.fh_size = rp->rp_openfh_len;
189                 memcpy(&cstate->current_fh.fh_handle.fh_base, rp->rp_openfh,
190                                 rp->rp_openfh_len);
191                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
192                 if (status)
193                         dprintk("nfsd4_open: replay failed"
194                                 " restoring previous filehandle\n");
195                 else
196                         status = nfserr_replay_me;
197         }
198         if (status)
199                 goto out;
200
201         /* Openowner is now set, so sequence id will get bumped.  Now we need
202          * these checks before we do any creates: */
203         status = nfserr_grace;
204         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
205                 goto out;
206         status = nfserr_no_grace;
207         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
208                 goto out;
209
210         switch (open->op_claim_type) {
211                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
212                         status = nfserr_inval;
213                         if (open->op_create)
214                                 goto out;
215                         /* fall through */
216                 case NFS4_OPEN_CLAIM_NULL:
217                         /*
218                          * (1) set CURRENT_FH to the file being opened,
219                          * creating it if necessary, (2) set open->op_cinfo,
220                          * (3) set open->op_truncate if the file is to be
221                          * truncated after opening, (4) do permission checking.
222                          */
223                         status = do_open_lookup(rqstp, &cstate->current_fh,
224                                                 open);
225                         if (status)
226                                 goto out;
227                         break;
228                 case NFS4_OPEN_CLAIM_PREVIOUS:
229                         open->op_stateowner->so_confirmed = 1;
230                         /*
231                          * The CURRENT_FH is already set to the file being
232                          * opened.  (1) set open->op_cinfo, (2) set
233                          * open->op_truncate if the file is to be truncated
234                          * after opening, (3) do permission checking.
235                         */
236                         status = do_open_fhandle(rqstp, &cstate->current_fh,
237                                                  open);
238                         if (status)
239                                 goto out;
240                         break;
241                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
242                         open->op_stateowner->so_confirmed = 1;
243                         dprintk("NFSD: unsupported OPEN claim type %d\n",
244                                 open->op_claim_type);
245                         status = nfserr_notsupp;
246                         goto out;
247                 default:
248                         dprintk("NFSD: Invalid OPEN claim type %d\n",
249                                 open->op_claim_type);
250                         status = nfserr_inval;
251                         goto out;
252         }
253         /*
254          * nfsd4_process_open2() does the actual opening of the file.  If
255          * successful, it (1) truncates the file if open->op_truncate was
256          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
257          */
258         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
259 out:
260         if (open->op_stateowner) {
261                 nfs4_get_stateowner(open->op_stateowner);
262                 cstate->replay_owner = open->op_stateowner;
263         }
264         nfs4_unlock_state();
265         return status;
266 }
267
268 /*
269  * filehandle-manipulating ops.
270  */
271 static __be32
272 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
273             struct svc_fh **getfh)
274 {
275         if (!cstate->current_fh.fh_dentry)
276                 return nfserr_nofilehandle;
277
278         *getfh = &cstate->current_fh;
279         return nfs_ok;
280 }
281
282 static __be32
283 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
284             struct nfsd4_putfh *putfh)
285 {
286         fh_put(&cstate->current_fh);
287         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
288         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
289                putfh->pf_fhlen);
290         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
291 }
292
293 static __be32
294 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
295                 void *arg)
296 {
297         __be32 status;
298
299         fh_put(&cstate->current_fh);
300         status = exp_pseudoroot(rqstp, &cstate->current_fh);
301         return status;
302 }
303
304 static __be32
305 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
306                 void *arg)
307 {
308         if (!cstate->save_fh.fh_dentry)
309                 return nfserr_restorefh;
310
311         fh_dup2(&cstate->current_fh, &cstate->save_fh);
312         return nfs_ok;
313 }
314
315 static __be32
316 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
317              void *arg)
318 {
319         if (!cstate->current_fh.fh_dentry)
320                 return nfserr_nofilehandle;
321
322         fh_dup2(&cstate->save_fh, &cstate->current_fh);
323         return nfs_ok;
324 }
325
326 /*
327  * misc nfsv4 ops
328  */
329 static __be32
330 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
331              struct nfsd4_access *access)
332 {
333         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
334                 return nfserr_inval;
335
336         access->ac_resp_access = access->ac_req_access;
337         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
338                            &access->ac_supported);
339 }
340
341 static __be32
342 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
343              struct nfsd4_commit *commit)
344 {
345         __be32 status;
346
347         u32 *p = (u32 *)commit->co_verf.data;
348         *p++ = nfssvc_boot.tv_sec;
349         *p++ = nfssvc_boot.tv_usec;
350
351         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
352                              commit->co_count);
353         if (status == nfserr_symlink)
354                 status = nfserr_inval;
355         return status;
356 }
357
358 static __be32
359 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
360              struct nfsd4_create *create)
361 {
362         struct svc_fh resfh;
363         __be32 status;
364         dev_t rdev;
365
366         fh_init(&resfh, NFS4_FHSIZE);
367
368         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
369                            NFSD_MAY_CREATE);
370         if (status == nfserr_symlink)
371                 status = nfserr_notdir;
372         if (status)
373                 return status;
374
375         switch (create->cr_type) {
376         case NF4LNK:
377                 /* ugh! we have to null-terminate the linktext, or
378                  * vfs_symlink() will choke.  it is always safe to
379                  * null-terminate by brute force, since at worst we
380                  * will overwrite the first byte of the create namelen
381                  * in the XDR buffer, which has already been extracted
382                  * during XDR decode.
383                  */
384                 create->cr_linkname[create->cr_linklen] = 0;
385
386                 status = nfsd_symlink(rqstp, &cstate->current_fh,
387                                       create->cr_name, create->cr_namelen,
388                                       create->cr_linkname, create->cr_linklen,
389                                       &resfh, &create->cr_iattr);
390                 break;
391
392         case NF4BLK:
393                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
394                 if (MAJOR(rdev) != create->cr_specdata1 ||
395                     MINOR(rdev) != create->cr_specdata2)
396                         return nfserr_inval;
397                 status = nfsd_create(rqstp, &cstate->current_fh,
398                                      create->cr_name, create->cr_namelen,
399                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
400                 break;
401
402         case NF4CHR:
403                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
404                 if (MAJOR(rdev) != create->cr_specdata1 ||
405                     MINOR(rdev) != create->cr_specdata2)
406                         return nfserr_inval;
407                 status = nfsd_create(rqstp, &cstate->current_fh,
408                                      create->cr_name, create->cr_namelen,
409                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
410                 break;
411
412         case NF4SOCK:
413                 status = nfsd_create(rqstp, &cstate->current_fh,
414                                      create->cr_name, create->cr_namelen,
415                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
416                 break;
417
418         case NF4FIFO:
419                 status = nfsd_create(rqstp, &cstate->current_fh,
420                                      create->cr_name, create->cr_namelen,
421                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
422                 break;
423
424         case NF4DIR:
425                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
426                 status = nfsd_create(rqstp, &cstate->current_fh,
427                                      create->cr_name, create->cr_namelen,
428                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
429                 break;
430
431         default:
432                 status = nfserr_badtype;
433         }
434
435         if (!status) {
436                 fh_unlock(&cstate->current_fh);
437                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
438                 fh_dup2(&cstate->current_fh, &resfh);
439         }
440
441         fh_put(&resfh);
442         return status;
443 }
444
445 static __be32
446 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
447               struct nfsd4_getattr *getattr)
448 {
449         __be32 status;
450
451         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
452         if (status)
453                 return status;
454
455         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
456                 return nfserr_inval;
457
458         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
459         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
460
461         getattr->ga_fhp = &cstate->current_fh;
462         return nfs_ok;
463 }
464
465 static __be32
466 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
467            struct nfsd4_link *link)
468 {
469         __be32 status = nfserr_nofilehandle;
470
471         if (!cstate->save_fh.fh_dentry)
472                 return status;
473         status = nfsd_link(rqstp, &cstate->current_fh,
474                            link->li_name, link->li_namelen, &cstate->save_fh);
475         if (!status)
476                 set_change_info(&link->li_cinfo, &cstate->current_fh);
477         return status;
478 }
479
480 static __be32
481 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
482               void *arg)
483 {
484         struct svc_fh tmp_fh;
485         __be32 ret;
486
487         fh_init(&tmp_fh, NFS4_FHSIZE);
488         ret = exp_pseudoroot(rqstp, &tmp_fh);
489         if (ret)
490                 return ret;
491         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
492                 fh_put(&tmp_fh);
493                 return nfserr_noent;
494         }
495         fh_put(&tmp_fh);
496         return nfsd_lookup(rqstp, &cstate->current_fh,
497                            "..", 2, &cstate->current_fh);
498 }
499
500 static __be32
501 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
502              struct nfsd4_lookup *lookup)
503 {
504         return nfsd_lookup(rqstp, &cstate->current_fh,
505                            lookup->lo_name, lookup->lo_len,
506                            &cstate->current_fh);
507 }
508
509 static __be32
510 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
511            struct nfsd4_read *read)
512 {
513         __be32 status;
514
515         /* no need to check permission - this will be done in nfsd_read() */
516
517         read->rd_filp = NULL;
518         if (read->rd_offset >= OFFSET_MAX)
519                 return nfserr_inval;
520
521         nfs4_lock_state();
522         /* check stateid */
523         if ((status = nfs4_preprocess_stateid_op(&cstate->current_fh,
524                                 &read->rd_stateid,
525                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
526                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
527                 goto out;
528         }
529         if (read->rd_filp)
530                 get_file(read->rd_filp);
531         status = nfs_ok;
532 out:
533         nfs4_unlock_state();
534         read->rd_rqstp = rqstp;
535         read->rd_fhp = &cstate->current_fh;
536         return status;
537 }
538
539 static __be32
540 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
541               struct nfsd4_readdir *readdir)
542 {
543         u64 cookie = readdir->rd_cookie;
544         static const nfs4_verifier zeroverf;
545
546         /* no need to check permission - this will be done in nfsd_readdir() */
547
548         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
549                 return nfserr_inval;
550
551         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
552         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
553
554         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
555             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
556                 return nfserr_bad_cookie;
557
558         readdir->rd_rqstp = rqstp;
559         readdir->rd_fhp = &cstate->current_fh;
560         return nfs_ok;
561 }
562
563 static __be32
564 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
565                struct nfsd4_readlink *readlink)
566 {
567         readlink->rl_rqstp = rqstp;
568         readlink->rl_fhp = &cstate->current_fh;
569         return nfs_ok;
570 }
571
572 static __be32
573 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
574              struct nfsd4_remove *remove)
575 {
576         __be32 status;
577
578         if (nfs4_in_grace())
579                 return nfserr_grace;
580         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
581                              remove->rm_name, remove->rm_namelen);
582         if (status == nfserr_symlink)
583                 return nfserr_notdir;
584         if (!status) {
585                 fh_unlock(&cstate->current_fh);
586                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
587         }
588         return status;
589 }
590
591 static __be32
592 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
593              struct nfsd4_rename *rename)
594 {
595         __be32 status = nfserr_nofilehandle;
596
597         if (!cstate->save_fh.fh_dentry)
598                 return status;
599         if (nfs4_in_grace() && !(cstate->save_fh.fh_export->ex_flags
600                                         & NFSEXP_NOSUBTREECHECK))
601                 return nfserr_grace;
602         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
603                              rename->rn_snamelen, &cstate->current_fh,
604                              rename->rn_tname, rename->rn_tnamelen);
605
606         /* the underlying filesystem returns different error's than required
607          * by NFSv4. both save_fh and current_fh have been verified.. */
608         if (status == nfserr_isdir)
609                 status = nfserr_exist;
610         else if ((status == nfserr_notdir) &&
611                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
612                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
613                 status = nfserr_exist;
614         else if (status == nfserr_symlink)
615                 status = nfserr_notdir;
616
617         if (!status) {
618                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
619                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
620         }
621         return status;
622 }
623
624 static __be32
625 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
626               struct nfsd4_secinfo *secinfo)
627 {
628         struct svc_fh resfh;
629         struct svc_export *exp;
630         struct dentry *dentry;
631         __be32 err;
632
633         fh_init(&resfh, NFS4_FHSIZE);
634         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
635                                     secinfo->si_name, secinfo->si_namelen,
636                                     &exp, &dentry);
637         if (err)
638                 return err;
639         if (dentry->d_inode == NULL) {
640                 exp_put(exp);
641                 err = nfserr_noent;
642         } else
643                 secinfo->si_exp = exp;
644         dput(dentry);
645         return err;
646 }
647
648 static __be32
649 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
650               struct nfsd4_setattr *setattr)
651 {
652         __be32 status = nfs_ok;
653
654         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
655                 nfs4_lock_state();
656                 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
657                         &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
658                 nfs4_unlock_state();
659                 if (status) {
660                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
661                         return status;
662                 }
663         }
664         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
665         if (status)
666                 return status;
667         status = nfs_ok;
668         if (setattr->sa_acl != NULL)
669                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
670                                             setattr->sa_acl);
671         if (status)
672                 goto out;
673         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
674                                 0, (time_t)0);
675 out:
676         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
677         return status;
678 }
679
680 static __be32
681 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
682             struct nfsd4_write *write)
683 {
684         stateid_t *stateid = &write->wr_stateid;
685         struct file *filp = NULL;
686         u32 *p;
687         __be32 status = nfs_ok;
688
689         /* no need to check permission - this will be done in nfsd_write() */
690
691         if (write->wr_offset >= OFFSET_MAX)
692                 return nfserr_inval;
693
694         nfs4_lock_state();
695         status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid,
696                                         CHECK_FH | WR_STATE, &filp);
697         if (filp)
698                 get_file(filp);
699         nfs4_unlock_state();
700
701         if (status) {
702                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
703                 return status;
704         }
705
706         write->wr_bytes_written = write->wr_buflen;
707         write->wr_how_written = write->wr_stable_how;
708         p = (u32 *)write->wr_verifier.data;
709         *p++ = nfssvc_boot.tv_sec;
710         *p++ = nfssvc_boot.tv_usec;
711
712         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
713                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
714                              write->wr_buflen, &write->wr_how_written);
715         if (filp)
716                 fput(filp);
717
718         if (status == nfserr_symlink)
719                 status = nfserr_inval;
720         return status;
721 }
722
723 /* This routine never returns NFS_OK!  If there are no other errors, it
724  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
725  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
726  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
727  */
728 static __be32
729 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
730              struct nfsd4_verify *verify)
731 {
732         __be32 *buf, *p;
733         int count;
734         __be32 status;
735
736         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
737         if (status)
738                 return status;
739
740         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
741             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
742                 return nfserr_attrnotsupp;
743         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
744             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
745                 return nfserr_inval;
746         if (verify->ve_attrlen & 3)
747                 return nfserr_inval;
748
749         /* count in words:
750          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
751          */
752         count = 4 + (verify->ve_attrlen >> 2);
753         buf = kmalloc(count << 2, GFP_KERNEL);
754         if (!buf)
755                 return nfserr_resource;
756
757         status = nfsd4_encode_fattr(&cstate->current_fh,
758                                     cstate->current_fh.fh_export,
759                                     cstate->current_fh.fh_dentry, buf,
760                                     &count, verify->ve_bmval,
761                                     rqstp, 0);
762
763         /* this means that nfsd4_encode_fattr() ran out of space */
764         if (status == nfserr_resource && count == 0)
765                 status = nfserr_not_same;
766         if (status)
767                 goto out_kfree;
768
769         p = buf + 3;
770         status = nfserr_not_same;
771         if (ntohl(*p++) != verify->ve_attrlen)
772                 goto out_kfree;
773         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
774                 status = nfserr_same;
775
776 out_kfree:
777         kfree(buf);
778         return status;
779 }
780
781 static __be32
782 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
783               struct nfsd4_verify *verify)
784 {
785         __be32 status;
786
787         status = _nfsd4_verify(rqstp, cstate, verify);
788         return status == nfserr_not_same ? nfs_ok : status;
789 }
790
791 static __be32
792 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
793              struct nfsd4_verify *verify)
794 {
795         __be32 status;
796
797         status = _nfsd4_verify(rqstp, cstate, verify);
798         return status == nfserr_same ? nfs_ok : status;
799 }
800
801 /*
802  * NULL call.
803  */
804 static __be32
805 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
806 {
807         return nfs_ok;
808 }
809
810 static inline void nfsd4_increment_op_stats(u32 opnum)
811 {
812         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
813                 nfsdstats.nfs4_opcount[opnum]++;
814 }
815
816 static void cstate_free(struct nfsd4_compound_state *cstate)
817 {
818         if (cstate == NULL)
819                 return;
820         fh_put(&cstate->current_fh);
821         fh_put(&cstate->save_fh);
822         BUG_ON(cstate->replay_owner);
823         kfree(cstate);
824 }
825
826 static struct nfsd4_compound_state *cstate_alloc(void)
827 {
828         struct nfsd4_compound_state *cstate;
829
830         cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL);
831         if (cstate == NULL)
832                 return NULL;
833         fh_init(&cstate->current_fh, NFS4_FHSIZE);
834         fh_init(&cstate->save_fh, NFS4_FHSIZE);
835         cstate->replay_owner = NULL;
836         return cstate;
837 }
838
839 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
840                               void *);
841
842 struct nfsd4_operation {
843         nfsd4op_func op_func;
844         u32 op_flags;
845 /* Most ops require a valid current filehandle; a few don't: */
846 #define ALLOWED_WITHOUT_FH 1
847 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
848 #define ALLOWED_ON_ABSENT_FS 2
849         char *op_name;
850 };
851
852 static struct nfsd4_operation nfsd4_ops[];
853
854 static const char *nfsd4_op_name(unsigned opnum);
855
856 /*
857  * COMPOUND call.
858  */
859 static __be32
860 nfsd4_proc_compound(struct svc_rqst *rqstp,
861                     struct nfsd4_compoundargs *args,
862                     struct nfsd4_compoundres *resp)
863 {
864         struct nfsd4_op *op;
865         struct nfsd4_operation *opdesc;
866         struct nfsd4_compound_state *cstate = NULL;
867         int             slack_bytes;
868         __be32          status;
869
870         resp->xbuf = &rqstp->rq_res;
871         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
872         resp->tagp = resp->p;
873         /* reserve space for: taglen, tag, and opcnt */
874         resp->p += 2 + XDR_QUADLEN(args->taglen);
875         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
876         resp->taglen = args->taglen;
877         resp->tag = args->tag;
878         resp->opcnt = 0;
879         resp->rqstp = rqstp;
880
881         /*
882          * According to RFC3010, this takes precedence over all other errors.
883          */
884         status = nfserr_minor_vers_mismatch;
885         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
886                 goto out;
887
888         status = nfserr_resource;
889         cstate = cstate_alloc();
890         if (cstate == NULL)
891                 goto out;
892
893         status = nfs_ok;
894         while (!status && resp->opcnt < args->opcnt) {
895                 op = &args->ops[resp->opcnt++];
896
897                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
898                         resp->opcnt, args->opcnt, op->opnum,
899                         nfsd4_op_name(op->opnum));
900
901                 /*
902                  * The XDR decode routines may have pre-set op->status;
903                  * for example, if there is a miscellaneous XDR error
904                  * it will be set to nfserr_bad_xdr.
905                  */
906                 if (op->status)
907                         goto encode_op;
908
909                 /* We must be able to encode a successful response to
910                  * this operation, with enough room left over to encode a
911                  * failed response to the next operation.  If we don't
912                  * have enough room, fail with ERR_RESOURCE.
913                  */
914                 slack_bytes = (char *)resp->end - (char *)resp->p;
915                 if (slack_bytes < COMPOUND_SLACK_SPACE
916                                 + COMPOUND_ERR_SLACK_SPACE) {
917                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
918                         op->status = nfserr_resource;
919                         goto encode_op;
920                 }
921
922                 opdesc = &nfsd4_ops[op->opnum];
923
924                 if (!cstate->current_fh.fh_dentry) {
925                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
926                                 op->status = nfserr_nofilehandle;
927                                 goto encode_op;
928                         }
929                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
930                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
931                         op->status = nfserr_moved;
932                         goto encode_op;
933                 }
934
935                 if (opdesc->op_func)
936                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
937                 else
938                         BUG_ON(op->status == nfs_ok);
939
940 encode_op:
941                 if (op->status == nfserr_replay_me) {
942                         op->replay = &cstate->replay_owner->so_replay;
943                         nfsd4_encode_replay(resp, op);
944                         status = op->status = op->replay->rp_status;
945                 } else {
946                         nfsd4_encode_operation(resp, op);
947                         status = op->status;
948                 }
949                 if (cstate->replay_owner) {
950                         nfs4_put_stateowner(cstate->replay_owner);
951                         cstate->replay_owner = NULL;
952                 }
953                 /* XXX Ugh, we need to get rid of this kind of special case: */
954                 if (op->opnum == OP_READ && op->u.read.rd_filp)
955                         fput(op->u.read.rd_filp);
956
957                 nfsd4_increment_op_stats(op->opnum);
958         }
959
960         cstate_free(cstate);
961 out:
962         nfsd4_release_compoundargs(args);
963         dprintk("nfsv4 compound returned %d\n", ntohl(status));
964         return status;
965 }
966
967 static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
968         [OP_ACCESS] = {
969                 .op_func = (nfsd4op_func)nfsd4_access,
970                 .op_name = "OP_ACCESS",
971         },
972         [OP_CLOSE] = {
973                 .op_func = (nfsd4op_func)nfsd4_close,
974                 .op_name = "OP_CLOSE",
975         },
976         [OP_COMMIT] = {
977                 .op_func = (nfsd4op_func)nfsd4_commit,
978                 .op_name = "OP_COMMIT",
979         },
980         [OP_CREATE] = {
981                 .op_func = (nfsd4op_func)nfsd4_create,
982                 .op_name = "OP_CREATE",
983         },
984         [OP_DELEGRETURN] = {
985                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
986                 .op_name = "OP_DELEGRETURN",
987         },
988         [OP_GETATTR] = {
989                 .op_func = (nfsd4op_func)nfsd4_getattr,
990                 .op_flags = ALLOWED_ON_ABSENT_FS,
991                 .op_name = "OP_GETATTR",
992         },
993         [OP_GETFH] = {
994                 .op_func = (nfsd4op_func)nfsd4_getfh,
995                 .op_name = "OP_GETFH",
996         },
997         [OP_LINK] = {
998                 .op_func = (nfsd4op_func)nfsd4_link,
999                 .op_name = "OP_LINK",
1000         },
1001         [OP_LOCK] = {
1002                 .op_func = (nfsd4op_func)nfsd4_lock,
1003                 .op_name = "OP_LOCK",
1004         },
1005         [OP_LOCKT] = {
1006                 .op_func = (nfsd4op_func)nfsd4_lockt,
1007                 .op_name = "OP_LOCKT",
1008         },
1009         [OP_LOCKU] = {
1010                 .op_func = (nfsd4op_func)nfsd4_locku,
1011                 .op_name = "OP_LOCKU",
1012         },
1013         [OP_LOOKUP] = {
1014                 .op_func = (nfsd4op_func)nfsd4_lookup,
1015                 .op_name = "OP_LOOKUP",
1016         },
1017         [OP_LOOKUPP] = {
1018                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1019                 .op_name = "OP_LOOKUPP",
1020         },
1021         [OP_NVERIFY] = {
1022                 .op_func = (nfsd4op_func)nfsd4_nverify,
1023                 .op_name = "OP_NVERIFY",
1024         },
1025         [OP_OPEN] = {
1026                 .op_func = (nfsd4op_func)nfsd4_open,
1027                 .op_name = "OP_OPEN",
1028         },
1029         [OP_OPEN_CONFIRM] = {
1030                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1031                 .op_name = "OP_OPEN_CONFIRM",
1032         },
1033         [OP_OPEN_DOWNGRADE] = {
1034                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1035                 .op_name = "OP_OPEN_DOWNGRADE",
1036         },
1037         [OP_PUTFH] = {
1038                 .op_func = (nfsd4op_func)nfsd4_putfh,
1039                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1040                 .op_name = "OP_PUTFH",
1041         },
1042         [OP_PUTPUBFH] = {
1043                 /* unsupported, just for future reference: */
1044                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1045                 .op_name = "OP_PUTPUBFH",
1046         },
1047         [OP_PUTROOTFH] = {
1048                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1049                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1050                 .op_name = "OP_PUTROOTFH",
1051         },
1052         [OP_READ] = {
1053                 .op_func = (nfsd4op_func)nfsd4_read,
1054                 .op_name = "OP_READ",
1055         },
1056         [OP_READDIR] = {
1057                 .op_func = (nfsd4op_func)nfsd4_readdir,
1058                 .op_name = "OP_READDIR",
1059         },
1060         [OP_READLINK] = {
1061                 .op_func = (nfsd4op_func)nfsd4_readlink,
1062                 .op_name = "OP_READLINK",
1063         },
1064         [OP_REMOVE] = {
1065                 .op_func = (nfsd4op_func)nfsd4_remove,
1066                 .op_name = "OP_REMOVE",
1067         },
1068         [OP_RENAME] = {
1069                 .op_name = "OP_RENAME",
1070                 .op_func = (nfsd4op_func)nfsd4_rename,
1071         },
1072         [OP_RENEW] = {
1073                 .op_func = (nfsd4op_func)nfsd4_renew,
1074                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1075                 .op_name = "OP_RENEW",
1076         },
1077         [OP_RESTOREFH] = {
1078                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1079                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1080                 .op_name = "OP_RESTOREFH",
1081         },
1082         [OP_SAVEFH] = {
1083                 .op_func = (nfsd4op_func)nfsd4_savefh,
1084                 .op_name = "OP_SAVEFH",
1085         },
1086         [OP_SECINFO] = {
1087                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1088                 .op_name = "OP_SECINFO",
1089         },
1090         [OP_SETATTR] = {
1091                 .op_func = (nfsd4op_func)nfsd4_setattr,
1092                 .op_name = "OP_SETATTR",
1093         },
1094         [OP_SETCLIENTID] = {
1095                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1096                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1097                 .op_name = "OP_SETCLIENTID",
1098         },
1099         [OP_SETCLIENTID_CONFIRM] = {
1100                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1101                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1102                 .op_name = "OP_SETCLIENTID_CONFIRM",
1103         },
1104         [OP_VERIFY] = {
1105                 .op_func = (nfsd4op_func)nfsd4_verify,
1106                 .op_name = "OP_VERIFY",
1107         },
1108         [OP_WRITE] = {
1109                 .op_func = (nfsd4op_func)nfsd4_write,
1110                 .op_name = "OP_WRITE",
1111         },
1112         [OP_RELEASE_LOCKOWNER] = {
1113                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1114                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1115                 .op_name = "OP_RELEASE_LOCKOWNER",
1116         },
1117 };
1118
1119 static const char *nfsd4_op_name(unsigned opnum)
1120 {
1121         if (opnum < ARRAY_SIZE(nfsd4_ops))
1122                 return nfsd4_ops[opnum].op_name;
1123         return "unknown_operation";
1124 }
1125
1126 #define nfs4svc_decode_voidargs         NULL
1127 #define nfs4svc_release_void            NULL
1128 #define nfsd4_voidres                   nfsd4_voidargs
1129 #define nfs4svc_release_compound        NULL
1130 struct nfsd4_voidargs { int dummy; };
1131
1132 #define PROC(name, argt, rest, relt, cache, respsize)   \
1133  { (svc_procfunc) nfsd4_proc_##name,            \
1134    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1135    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1136    (kxdrproc_t) nfs4svc_release_##relt,         \
1137    sizeof(struct nfsd4_##argt##args),           \
1138    sizeof(struct nfsd4_##rest##res),            \
1139    0,                                           \
1140    cache,                                       \
1141    respsize,                                    \
1142  }
1143
1144 /*
1145  * TODO: At the present time, the NFSv4 server does not do XID caching
1146  * of requests.  Implementing XID caching would not be a serious problem,
1147  * although it would require a mild change in interfaces since one
1148  * doesn't know whether an NFSv4 request is idempotent until after the
1149  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1150  * Astrand's regression testsuite for NFSv4 servers), which reuses
1151  * XID's liberally, so I've left it unimplemented until pynfs generates
1152  * better XID's.
1153  */
1154 static struct svc_procedure             nfsd_procedures4[2] = {
1155   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1156   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1157 };
1158
1159 struct svc_version      nfsd_version4 = {
1160                 .vs_vers        = 4,
1161                 .vs_nproc       = 2,
1162                 .vs_proc        = nfsd_procedures4,
1163                 .vs_dispatch    = nfsd_dispatch,
1164                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1165 };
1166
1167 /*
1168  * Local variables:
1169  *  c-basic-offset: 8
1170  * End:
1171  */