Merge upstream 2.6.13-rc3 into ieee80211 branch of netdev-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  * Note: some routines in this file are just trivial wrappers
38  * (e.g. nfsd4_lookup()) defined solely for the sake of consistent
39  * naming.  Since all such routines have been declared "inline",
40  * there shouldn't be any associated overhead.  At some point in
41  * the future, I might inline these "by hand" to clean up a
42  * little.
43  */
44
45 #include <linux/param.h>
46 #include <linux/major.h>
47 #include <linux/slab.h>
48 #include <linux/file.h>
49
50 #include <linux/sunrpc/svc.h>
51 #include <linux/nfsd/nfsd.h>
52 #include <linux/nfsd/cache.h>
53 #include <linux/nfs4.h>
54 #include <linux/nfsd/state.h>
55 #include <linux/nfsd/xdr4.h>
56 #include <linux/nfs4_acl.h>
57
58 #define NFSDDBG_FACILITY                NFSDDBG_PROC
59
60 static inline void
61 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
62 {
63         fh_put(dst);
64         dget(src->fh_dentry);
65         if (src->fh_export)
66                 cache_get(&src->fh_export->h);
67         *dst = *src;
68 }
69
70 static int
71 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
72 {
73         int accmode, status;
74
75         if (open->op_truncate &&
76                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
77                 return nfserr_inval;
78
79         accmode = MAY_NOP;
80         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
81                 accmode = MAY_READ;
82         if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE)
83                 accmode |= (MAY_WRITE | MAY_TRUNC);
84         accmode |= MAY_OWNER_OVERRIDE;
85
86         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
87
88         return status;
89 }
90
91 static int
92 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
93 {
94         struct svc_fh resfh;
95         int status;
96
97         fh_init(&resfh, NFS4_FHSIZE);
98         open->op_truncate = 0;
99
100         if (open->op_create) {
101                 /*
102                  * Note: create modes (UNCHECKED,GUARDED...) are the same
103                  * in NFSv4 as in v3.
104                  */
105                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
106                                         open->op_fname.len, &open->op_iattr,
107                                         &resfh, open->op_createmode,
108                                         (u32 *)open->op_verf.data, &open->op_truncate);
109         }
110         else {
111                 status = nfsd_lookup(rqstp, current_fh,
112                                      open->op_fname.data, open->op_fname.len, &resfh);
113                 fh_unlock(current_fh);
114         }
115
116         if (!status) {
117                 set_change_info(&open->op_cinfo, current_fh);
118
119                 /* set reply cache */
120                 fh_dup2(current_fh, &resfh);
121                 open->op_stateowner->so_replay.rp_openfh_len =
122                         resfh.fh_handle.fh_size;
123                 memcpy(open->op_stateowner->so_replay.rp_openfh,
124                                 &resfh.fh_handle.fh_base,
125                                 resfh.fh_handle.fh_size);
126
127                 status = do_open_permission(rqstp, current_fh, open);
128         }
129
130         fh_put(&resfh);
131         return status;
132 }
133
134 static int
135 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
136 {
137         int status;
138
139         /* Only reclaims from previously confirmed clients are valid */
140         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
141                 return status;
142
143         /* We don't know the target directory, and therefore can not
144         * set the change info
145         */
146
147         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
148
149         /* set replay cache */
150         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
151         memcpy(open->op_stateowner->so_replay.rp_openfh,
152                 &current_fh->fh_handle.fh_base,
153                 current_fh->fh_handle.fh_size);
154
155         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
156                 (open->op_iattr.ia_size == 0);
157
158         status = do_open_permission(rqstp, current_fh, open);
159
160         return status;
161 }
162
163
164 static inline int
165 nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
166 {
167         int status;
168         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
169                 (int)open->op_fname.len, open->op_fname.data,
170                 open->op_stateowner);
171
172         /* This check required by spec. */
173         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
174                 return nfserr_inval;
175
176         nfs4_lock_state();
177
178         /* check seqid for replay. set nfs4_owner */
179         status = nfsd4_process_open1(open);
180         if (status == NFSERR_REPLAY_ME) {
181                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
182                 fh_put(current_fh);
183                 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
184                 memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
185                                 rp->rp_openfh_len);
186                 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
187                 if (status)
188                         dprintk("nfsd4_open: replay failed"
189                                 " restoring previous filehandle\n");
190                 else
191                         status = NFSERR_REPLAY_ME;
192         }
193         if (status)
194                 goto out;
195         switch (open->op_claim_type) {
196                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
197                         status = nfserr_inval;
198                         if (open->op_create)
199                                 goto out;
200                         /* fall through */
201                 case NFS4_OPEN_CLAIM_NULL:
202                         /*
203                          * (1) set CURRENT_FH to the file being opened,
204                          * creating it if necessary, (2) set open->op_cinfo,
205                          * (3) set open->op_truncate if the file is to be
206                          * truncated after opening, (4) do permission checking.
207                          */
208                         status = do_open_lookup(rqstp, current_fh, open);
209                         if (status)
210                                 goto out;
211                         break;
212                 case NFS4_OPEN_CLAIM_PREVIOUS:
213                         /*
214                          * The CURRENT_FH is already set to the file being
215                          * opened.  (1) set open->op_cinfo, (2) set
216                          * open->op_truncate if the file is to be truncated
217                          * after opening, (3) do permission checking.
218                         */
219                         status = do_open_fhandle(rqstp, current_fh, open);
220                         if (status)
221                                 goto out;
222                         break;
223                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
224                         printk("NFSD: unsupported OPEN claim type %d\n",
225                                 open->op_claim_type);
226                         status = nfserr_notsupp;
227                         goto out;
228                 default:
229                         printk("NFSD: Invalid OPEN claim type %d\n",
230                                 open->op_claim_type);
231                         status = nfserr_inval;
232                         goto out;
233         }
234         /*
235          * nfsd4_process_open2() does the actual opening of the file.  If
236          * successful, it (1) truncates the file if open->op_truncate was
237          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
238          */
239         status = nfsd4_process_open2(rqstp, current_fh, open);
240 out:
241         if (open->op_stateowner)
242                 nfs4_get_stateowner(open->op_stateowner);
243         nfs4_unlock_state();
244         return status;
245 }
246
247 /*
248  * filehandle-manipulating ops.
249  */
250 static inline int
251 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
252 {
253         if (!current_fh->fh_dentry)
254                 return nfserr_nofilehandle;
255
256         *getfh = current_fh;
257         return nfs_ok;
258 }
259
260 static inline int
261 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
262 {
263         fh_put(current_fh);
264         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
265         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
266         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
267 }
268
269 static inline int
270 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
271 {
272         int status;
273
274         fh_put(current_fh);
275         status = exp_pseudoroot(rqstp->rq_client, current_fh,
276                               &rqstp->rq_chandle);
277         if (!status)
278                 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
279         return status;
280 }
281
282 static inline int
283 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
284 {
285         if (!save_fh->fh_dentry)
286                 return nfserr_restorefh;
287
288         fh_dup2(current_fh, save_fh);
289         return nfs_ok;
290 }
291
292 static inline int
293 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
294 {
295         if (!current_fh->fh_dentry)
296                 return nfserr_nofilehandle;
297
298         fh_dup2(save_fh, current_fh);
299         return nfs_ok;
300 }
301
302 /*
303  * misc nfsv4 ops
304  */
305 static inline int
306 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
307 {
308         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
309                 return nfserr_inval;
310
311         access->ac_resp_access = access->ac_req_access;
312         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
313 }
314
315 static inline int
316 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
317 {
318         int status;
319
320         u32 *p = (u32 *)commit->co_verf.data;
321         *p++ = nfssvc_boot.tv_sec;
322         *p++ = nfssvc_boot.tv_usec;
323
324         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
325         if (status == nfserr_symlink)
326                 status = nfserr_inval;
327         return status;
328 }
329
330 static int
331 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
332 {
333         struct svc_fh resfh;
334         int status;
335         dev_t rdev;
336
337         fh_init(&resfh, NFS4_FHSIZE);
338
339         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
340         if (status == nfserr_symlink)
341                 status = nfserr_notdir;
342         if (status)
343                 return status;
344
345         switch (create->cr_type) {
346         case NF4LNK:
347                 /* ugh! we have to null-terminate the linktext, or
348                  * vfs_symlink() will choke.  it is always safe to
349                  * null-terminate by brute force, since at worst we
350                  * will overwrite the first byte of the create namelen
351                  * in the XDR buffer, which has already been extracted
352                  * during XDR decode.
353                  */
354                 create->cr_linkname[create->cr_linklen] = 0;
355
356                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
357                                       create->cr_namelen, create->cr_linkname,
358                                       create->cr_linklen, &resfh, &create->cr_iattr);
359                 break;
360
361         case NF4BLK:
362                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
363                 if (MAJOR(rdev) != create->cr_specdata1 ||
364                     MINOR(rdev) != create->cr_specdata2)
365                         return nfserr_inval;
366                 status = nfsd_create(rqstp, current_fh, create->cr_name,
367                                      create->cr_namelen, &create->cr_iattr,
368                                      S_IFBLK, rdev, &resfh);
369                 break;
370
371         case NF4CHR:
372                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
373                 if (MAJOR(rdev) != create->cr_specdata1 ||
374                     MINOR(rdev) != create->cr_specdata2)
375                         return nfserr_inval;
376                 status = nfsd_create(rqstp, current_fh, create->cr_name,
377                                      create->cr_namelen, &create->cr_iattr,
378                                      S_IFCHR, rdev, &resfh);
379                 break;
380
381         case NF4SOCK:
382                 status = nfsd_create(rqstp, current_fh, create->cr_name,
383                                      create->cr_namelen, &create->cr_iattr,
384                                      S_IFSOCK, 0, &resfh);
385                 break;
386
387         case NF4FIFO:
388                 status = nfsd_create(rqstp, current_fh, create->cr_name,
389                                      create->cr_namelen, &create->cr_iattr,
390                                      S_IFIFO, 0, &resfh);
391                 break;
392
393         case NF4DIR:
394                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
395                 status = nfsd_create(rqstp, current_fh, create->cr_name,
396                                      create->cr_namelen, &create->cr_iattr,
397                                      S_IFDIR, 0, &resfh);
398                 break;
399
400         default:
401                 status = nfserr_badtype;
402         }
403
404         if (!status) {
405                 fh_unlock(current_fh);
406                 set_change_info(&create->cr_cinfo, current_fh);
407                 fh_dup2(current_fh, &resfh);
408         }
409
410         fh_put(&resfh);
411         return status;
412 }
413
414 static inline int
415 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
416 {
417         int status;
418
419         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
420         if (status)
421                 return status;
422
423         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
424                 return nfserr_inval;
425
426         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
427         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
428
429         getattr->ga_fhp = current_fh;
430         return nfs_ok;
431 }
432
433 static inline int
434 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
435            struct svc_fh *save_fh, struct nfsd4_link *link)
436 {
437         int status = nfserr_nofilehandle;
438
439         if (!save_fh->fh_dentry)
440                 return status;
441         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
442         if (!status)
443                 set_change_info(&link->li_cinfo, current_fh);
444         return status;
445 }
446
447 static int
448 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
449 {
450         struct svc_fh tmp_fh;
451         int ret;
452
453         fh_init(&tmp_fh, NFS4_FHSIZE);
454         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
455                               &rqstp->rq_chandle)) != 0)
456                 return ret;
457         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
458                 fh_put(&tmp_fh);
459                 return nfserr_noent;
460         }
461         fh_put(&tmp_fh);
462         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
463 }
464
465 static inline int
466 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
467 {
468         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
469 }
470
471 static inline int
472 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
473 {
474         int status;
475
476         /* no need to check permission - this will be done in nfsd_read() */
477
478         read->rd_filp = NULL;
479         if (read->rd_offset >= OFFSET_MAX)
480                 return nfserr_inval;
481
482         nfs4_lock_state();
483         /* check stateid */
484         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
485                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
486                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
487                 goto out;
488         }
489         if (read->rd_filp)
490                 get_file(read->rd_filp);
491         status = nfs_ok;
492 out:
493         nfs4_unlock_state();
494         read->rd_rqstp = rqstp;
495         read->rd_fhp = current_fh;
496         return status;
497 }
498
499 static inline int
500 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
501 {
502         u64 cookie = readdir->rd_cookie;
503         static const nfs4_verifier zeroverf;
504
505         /* no need to check permission - this will be done in nfsd_readdir() */
506
507         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
508                 return nfserr_inval;
509
510         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
511         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
512
513         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
514             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
515                 return nfserr_bad_cookie;
516
517         readdir->rd_rqstp = rqstp;
518         readdir->rd_fhp = current_fh;
519         return nfs_ok;
520 }
521
522 static inline int
523 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
524 {
525         readlink->rl_rqstp = rqstp;
526         readlink->rl_fhp = current_fh;
527         return nfs_ok;
528 }
529
530 static inline int
531 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
532 {
533         int status;
534
535         if (nfs4_in_grace())
536                 return nfserr_grace;
537         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
538         if (status == nfserr_symlink)
539                 return nfserr_notdir;
540         if (!status) {
541                 fh_unlock(current_fh);
542                 set_change_info(&remove->rm_cinfo, current_fh);
543         }
544         return status;
545 }
546
547 static inline int
548 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
549              struct svc_fh *save_fh, struct nfsd4_rename *rename)
550 {
551         int status = nfserr_nofilehandle;
552
553         if (!save_fh->fh_dentry)
554                 return status;
555         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
556                                         & NFSEXP_NOSUBTREECHECK))
557                 return nfserr_grace;
558         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
559                              rename->rn_snamelen, current_fh,
560                              rename->rn_tname, rename->rn_tnamelen);
561
562         /* the underlying filesystem returns different error's than required
563          * by NFSv4. both save_fh and current_fh have been verified.. */
564         if (status == nfserr_isdir)
565                 status = nfserr_exist;
566         else if ((status == nfserr_notdir) &&
567                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
568                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
569                 status = nfserr_exist;
570         else if (status == nfserr_symlink)
571                 status = nfserr_notdir;
572
573         if (!status) {
574                 set_change_info(&rename->rn_sinfo, current_fh);
575                 set_change_info(&rename->rn_tinfo, save_fh);
576         }
577         return status;
578 }
579
580 static inline int
581 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
582 {
583         int status = nfs_ok;
584
585         if (!current_fh->fh_dentry)
586                 return nfserr_nofilehandle;
587
588         status = nfs_ok;
589         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
590                 nfs4_lock_state();
591                 if ((status = nfs4_preprocess_stateid_op(current_fh,
592                                                 &setattr->sa_stateid,
593                                                 CHECK_FH | WR_STATE, NULL))) {
594                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
595                         goto out_unlock;
596                 }
597                 nfs4_unlock_state();
598         }
599         status = nfs_ok;
600         if (setattr->sa_acl != NULL)
601                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
602         if (status)
603                 goto out;
604         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
605                                 0, (time_t)0);
606 out:
607         return status;
608 out_unlock:
609         nfs4_unlock_state();
610         return status;
611 }
612
613 static inline int
614 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
615 {
616         stateid_t *stateid = &write->wr_stateid;
617         struct file *filp = NULL;
618         u32 *p;
619         int status = nfs_ok;
620
621         /* no need to check permission - this will be done in nfsd_write() */
622
623         if (write->wr_offset >= OFFSET_MAX)
624                 return nfserr_inval;
625
626         nfs4_lock_state();
627         if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
628                                         CHECK_FH | WR_STATE, &filp))) {
629                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
630                 goto out;
631         }
632         if (filp)
633                 get_file(filp);
634         nfs4_unlock_state();
635
636         write->wr_bytes_written = write->wr_buflen;
637         write->wr_how_written = write->wr_stable_how;
638         p = (u32 *)write->wr_verifier.data;
639         *p++ = nfssvc_boot.tv_sec;
640         *p++ = nfssvc_boot.tv_usec;
641
642         status =  nfsd_write(rqstp, current_fh, filp, write->wr_offset,
643                         write->wr_vec, write->wr_vlen, write->wr_buflen,
644                         &write->wr_how_written);
645         if (filp)
646                 fput(filp);
647
648         if (status == nfserr_symlink)
649                 status = nfserr_inval;
650         return status;
651 out:
652         nfs4_unlock_state();
653         return status;
654 }
655
656 /* This routine never returns NFS_OK!  If there are no other errors, it
657  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
658  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
659  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
660  */
661 static int
662 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
663 {
664         u32 *buf, *p;
665         int count;
666         int status;
667
668         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
669         if (status)
670                 return status;
671
672         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
673             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
674                 return nfserr_attrnotsupp;
675         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
676             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
677                 return nfserr_inval;
678         if (verify->ve_attrlen & 3)
679                 return nfserr_inval;
680
681         /* count in words:
682          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
683          */
684         count = 4 + (verify->ve_attrlen >> 2);
685         buf = kmalloc(count << 2, GFP_KERNEL);
686         if (!buf)
687                 return nfserr_resource;
688
689         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
690                                     current_fh->fh_dentry, buf,
691                                     &count, verify->ve_bmval,
692                                     rqstp);
693
694         /* this means that nfsd4_encode_fattr() ran out of space */
695         if (status == nfserr_resource && count == 0)
696                 status = nfserr_not_same;
697         if (status)
698                 goto out_kfree;
699
700         p = buf + 3;
701         status = nfserr_not_same;
702         if (ntohl(*p++) != verify->ve_attrlen)
703                 goto out_kfree;
704         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
705                 status = nfserr_same;
706
707 out_kfree:
708         kfree(buf);
709         return status;
710 }
711
712 /*
713  * NULL call.
714  */
715 static int
716 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
717 {
718         return nfs_ok;
719 }
720
721
722 /*
723  * COMPOUND call.
724  */
725 static int
726 nfsd4_proc_compound(struct svc_rqst *rqstp,
727                     struct nfsd4_compoundargs *args,
728                     struct nfsd4_compoundres *resp)
729 {
730         struct nfsd4_op *op;
731         struct svc_fh   *current_fh = NULL;
732         struct svc_fh   *save_fh = NULL;
733         struct nfs4_stateowner *replay_owner = NULL;
734         int             slack_space;    /* in words, not bytes! */
735         int             status;
736
737         status = nfserr_resource;
738         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
739         if (current_fh == NULL)
740                 goto out;
741         fh_init(current_fh, NFS4_FHSIZE);
742         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
743         if (save_fh == NULL)
744                 goto out;
745         fh_init(save_fh, NFS4_FHSIZE);
746
747         resp->xbuf = &rqstp->rq_res;
748         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
749         resp->tagp = resp->p;
750         /* reserve space for: taglen, tag, and opcnt */
751         resp->p += 2 + XDR_QUADLEN(args->taglen);
752         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
753         resp->taglen = args->taglen;
754         resp->tag = args->tag;
755         resp->opcnt = 0;
756         resp->rqstp = rqstp;
757
758         /*
759          * According to RFC3010, this takes precedence over all other errors.
760          */
761         status = nfserr_minor_vers_mismatch;
762         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
763                 goto out;
764
765         status = nfs_ok;
766         while (!status && resp->opcnt < args->opcnt) {
767                 op = &args->ops[resp->opcnt++];
768
769                 /*
770                  * The XDR decode routines may have pre-set op->status;
771                  * for example, if there is a miscellaneous XDR error
772                  * it will be set to nfserr_bad_xdr.
773                  */
774                 if (op->status)
775                         goto encode_op;
776
777                 /* We must be able to encode a successful response to
778                  * this operation, with enough room left over to encode a
779                  * failed response to the next operation.  If we don't
780                  * have enough room, fail with ERR_RESOURCE.
781                  */
782 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
783                 slack_space = (char *)resp->end - (char *)resp->p;
784                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
785                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
786                         op->status = nfserr_resource;
787                         goto encode_op;
788                 }
789
790                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
791                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
792                 * require a valid current filehandle
793                 *
794                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
795                 * due to required returned bitmap argument
796                 */
797                 if ((!current_fh->fh_dentry) &&
798                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
799                    (op->opnum == OP_SETCLIENTID) ||
800                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
801                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
802                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
803                    (op->opnum == OP_SETATTR))) {
804                         op->status = nfserr_nofilehandle;
805                         goto encode_op;
806                 }
807                 switch (op->opnum) {
808                 case OP_ACCESS:
809                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
810                         break;
811                 case OP_CLOSE:
812                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close);
813                         replay_owner = op->u.close.cl_stateowner;
814                         break;
815                 case OP_COMMIT:
816                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
817                         break;
818                 case OP_CREATE:
819                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
820                         break;
821                 case OP_DELEGRETURN:
822                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
823                         break;
824                 case OP_GETATTR:
825                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
826                         break;
827                 case OP_GETFH:
828                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
829                         break;
830                 case OP_LINK:
831                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
832                         break;
833                 case OP_LOCK:
834                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock);
835                         replay_owner = op->u.lock.lk_stateowner;
836                         break;
837                 case OP_LOCKT:
838                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
839                         break;
840                 case OP_LOCKU:
841                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku);
842                         replay_owner = op->u.locku.lu_stateowner;
843                         break;
844                 case OP_LOOKUP:
845                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
846                         break;
847                 case OP_LOOKUPP:
848                         op->status = nfsd4_lookupp(rqstp, current_fh);
849                         break;
850                 case OP_NVERIFY:
851                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
852                         if (op->status == nfserr_not_same)
853                                 op->status = nfs_ok;
854                         break;
855                 case OP_OPEN:
856                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open);
857                         replay_owner = op->u.open.op_stateowner;
858                         break;
859                 case OP_OPEN_CONFIRM:
860                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm);
861                         replay_owner = op->u.open_confirm.oc_stateowner;
862                         break;
863                 case OP_OPEN_DOWNGRADE:
864                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade);
865                         replay_owner = op->u.open_downgrade.od_stateowner;
866                         break;
867                 case OP_PUTFH:
868                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
869                         break;
870                 case OP_PUTROOTFH:
871                         op->status = nfsd4_putrootfh(rqstp, current_fh);
872                         break;
873                 case OP_READ:
874                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
875                         break;
876                 case OP_READDIR:
877                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
878                         break;
879                 case OP_READLINK:
880                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
881                         break;
882                 case OP_REMOVE:
883                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
884                         break;
885                 case OP_RENAME:
886                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
887                         break;
888                 case OP_RENEW:
889                         op->status = nfsd4_renew(&op->u.renew);
890                         break;
891                 case OP_RESTOREFH:
892                         op->status = nfsd4_restorefh(current_fh, save_fh);
893                         break;
894                 case OP_SAVEFH:
895                         op->status = nfsd4_savefh(current_fh, save_fh);
896                         break;
897                 case OP_SETATTR:
898                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
899                         break;
900                 case OP_SETCLIENTID:
901                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
902                         break;
903                 case OP_SETCLIENTID_CONFIRM:
904                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
905                         break;
906                 case OP_VERIFY:
907                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
908                         if (op->status == nfserr_same)
909                                 op->status = nfs_ok;
910                         break;
911                 case OP_WRITE:
912                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
913                         break;
914                 case OP_RELEASE_LOCKOWNER:
915                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
916                         break;
917                 default:
918                         BUG_ON(op->status == nfs_ok);
919                         break;
920                 }
921
922 encode_op:
923                 if (op->status == NFSERR_REPLAY_ME) {
924                         op->replay = &replay_owner->so_replay;
925                         nfsd4_encode_replay(resp, op);
926                         status = op->status = op->replay->rp_status;
927                 } else {
928                         nfsd4_encode_operation(resp, op);
929                         status = op->status;
930                 }
931                 if (replay_owner && (replay_owner != (void *)(-1))) {
932                         nfs4_put_stateowner(replay_owner);
933                         replay_owner = NULL;
934                 }
935                 /* XXX Ugh, we need to get rid of this kind of special case: */
936                 if (op->opnum == OP_READ && op->u.read.rd_filp)
937                         fput(op->u.read.rd_filp);
938         }
939
940 out:
941         nfsd4_release_compoundargs(args);
942         if (current_fh)
943                 fh_put(current_fh);
944         kfree(current_fh);
945         if (save_fh)
946                 fh_put(save_fh);
947         kfree(save_fh);
948         return status;
949 }
950
951 #define nfs4svc_decode_voidargs         NULL
952 #define nfs4svc_release_void            NULL
953 #define nfsd4_voidres                   nfsd4_voidargs
954 #define nfs4svc_release_compound        NULL
955 struct nfsd4_voidargs { int dummy; };
956
957 #define PROC(name, argt, rest, relt, cache, respsize)   \
958  { (svc_procfunc) nfsd4_proc_##name,            \
959    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
960    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
961    (kxdrproc_t) nfs4svc_release_##relt,         \
962    sizeof(struct nfsd4_##argt##args),           \
963    sizeof(struct nfsd4_##rest##res),            \
964    0,                                           \
965    cache,                                       \
966    respsize,                                    \
967  }
968
969 /*
970  * TODO: At the present time, the NFSv4 server does not do XID caching
971  * of requests.  Implementing XID caching would not be a serious problem,
972  * although it would require a mild change in interfaces since one
973  * doesn't know whether an NFSv4 request is idempotent until after the
974  * XDR decode.  However, XID caching totally confuses pynfs (Peter
975  * Astrand's regression testsuite for NFSv4 servers), which reuses
976  * XID's liberally, so I've left it unimplemented until pynfs generates
977  * better XID's.
978  */
979 static struct svc_procedure             nfsd_procedures4[2] = {
980   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
981   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
982 };
983
984 struct svc_version      nfsd_version4 = {
985                 .vs_vers        = 4,
986                 .vs_nproc       = 2,
987                 .vs_proc        = nfsd_procedures4,
988                 .vs_dispatch    = nfsd_dispatch,
989                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
990 };
991
992 /*
993  * Local variables:
994  *  c-basic-offset: 8
995  * End:
996  */