Merge /spare/repo/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  * 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, struct nfs4_stateowner **replay_owner)
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                 *replay_owner = open->op_stateowner;
244         }
245         nfs4_unlock_state();
246         return status;
247 }
248
249 /*
250  * filehandle-manipulating ops.
251  */
252 static inline int
253 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
254 {
255         if (!current_fh->fh_dentry)
256                 return nfserr_nofilehandle;
257
258         *getfh = current_fh;
259         return nfs_ok;
260 }
261
262 static inline int
263 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
264 {
265         fh_put(current_fh);
266         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
267         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
268         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
269 }
270
271 static inline int
272 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
273 {
274         int status;
275
276         fh_put(current_fh);
277         status = exp_pseudoroot(rqstp->rq_client, current_fh,
278                               &rqstp->rq_chandle);
279         if (!status)
280                 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
281         return status;
282 }
283
284 static inline int
285 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
286 {
287         if (!save_fh->fh_dentry)
288                 return nfserr_restorefh;
289
290         fh_dup2(current_fh, save_fh);
291         return nfs_ok;
292 }
293
294 static inline int
295 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
296 {
297         if (!current_fh->fh_dentry)
298                 return nfserr_nofilehandle;
299
300         fh_dup2(save_fh, current_fh);
301         return nfs_ok;
302 }
303
304 /*
305  * misc nfsv4 ops
306  */
307 static inline int
308 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
309 {
310         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
311                 return nfserr_inval;
312
313         access->ac_resp_access = access->ac_req_access;
314         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
315 }
316
317 static inline int
318 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
319 {
320         int status;
321
322         u32 *p = (u32 *)commit->co_verf.data;
323         *p++ = nfssvc_boot.tv_sec;
324         *p++ = nfssvc_boot.tv_usec;
325
326         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
327         if (status == nfserr_symlink)
328                 status = nfserr_inval;
329         return status;
330 }
331
332 static int
333 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
334 {
335         struct svc_fh resfh;
336         int status;
337         dev_t rdev;
338
339         fh_init(&resfh, NFS4_FHSIZE);
340
341         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
342         if (status == nfserr_symlink)
343                 status = nfserr_notdir;
344         if (status)
345                 return status;
346
347         switch (create->cr_type) {
348         case NF4LNK:
349                 /* ugh! we have to null-terminate the linktext, or
350                  * vfs_symlink() will choke.  it is always safe to
351                  * null-terminate by brute force, since at worst we
352                  * will overwrite the first byte of the create namelen
353                  * in the XDR buffer, which has already been extracted
354                  * during XDR decode.
355                  */
356                 create->cr_linkname[create->cr_linklen] = 0;
357
358                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
359                                       create->cr_namelen, create->cr_linkname,
360                                       create->cr_linklen, &resfh, &create->cr_iattr);
361                 break;
362
363         case NF4BLK:
364                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
365                 if (MAJOR(rdev) != create->cr_specdata1 ||
366                     MINOR(rdev) != create->cr_specdata2)
367                         return nfserr_inval;
368                 status = nfsd_create(rqstp, current_fh, create->cr_name,
369                                      create->cr_namelen, &create->cr_iattr,
370                                      S_IFBLK, rdev, &resfh);
371                 break;
372
373         case NF4CHR:
374                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
375                 if (MAJOR(rdev) != create->cr_specdata1 ||
376                     MINOR(rdev) != create->cr_specdata2)
377                         return nfserr_inval;
378                 status = nfsd_create(rqstp, current_fh, create->cr_name,
379                                      create->cr_namelen, &create->cr_iattr,
380                                      S_IFCHR, rdev, &resfh);
381                 break;
382
383         case NF4SOCK:
384                 status = nfsd_create(rqstp, current_fh, create->cr_name,
385                                      create->cr_namelen, &create->cr_iattr,
386                                      S_IFSOCK, 0, &resfh);
387                 break;
388
389         case NF4FIFO:
390                 status = nfsd_create(rqstp, current_fh, create->cr_name,
391                                      create->cr_namelen, &create->cr_iattr,
392                                      S_IFIFO, 0, &resfh);
393                 break;
394
395         case NF4DIR:
396                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
397                 status = nfsd_create(rqstp, current_fh, create->cr_name,
398                                      create->cr_namelen, &create->cr_iattr,
399                                      S_IFDIR, 0, &resfh);
400                 break;
401
402         default:
403                 status = nfserr_badtype;
404         }
405
406         if (!status) {
407                 fh_unlock(current_fh);
408                 set_change_info(&create->cr_cinfo, current_fh);
409                 fh_dup2(current_fh, &resfh);
410         }
411
412         fh_put(&resfh);
413         return status;
414 }
415
416 static inline int
417 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
418 {
419         int status;
420
421         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
422         if (status)
423                 return status;
424
425         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
426                 return nfserr_inval;
427
428         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
429         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
430
431         getattr->ga_fhp = current_fh;
432         return nfs_ok;
433 }
434
435 static inline int
436 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
437            struct svc_fh *save_fh, struct nfsd4_link *link)
438 {
439         int status = nfserr_nofilehandle;
440
441         if (!save_fh->fh_dentry)
442                 return status;
443         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
444         if (!status)
445                 set_change_info(&link->li_cinfo, current_fh);
446         return status;
447 }
448
449 static int
450 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
451 {
452         struct svc_fh tmp_fh;
453         int ret;
454
455         fh_init(&tmp_fh, NFS4_FHSIZE);
456         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
457                               &rqstp->rq_chandle)) != 0)
458                 return ret;
459         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
460                 fh_put(&tmp_fh);
461                 return nfserr_noent;
462         }
463         fh_put(&tmp_fh);
464         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
465 }
466
467 static inline int
468 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
469 {
470         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
471 }
472
473 static inline int
474 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
475 {
476         int status;
477
478         /* no need to check permission - this will be done in nfsd_read() */
479
480         read->rd_filp = NULL;
481         if (read->rd_offset >= OFFSET_MAX)
482                 return nfserr_inval;
483
484         nfs4_lock_state();
485         /* check stateid */
486         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
487                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
488                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
489                 goto out;
490         }
491         if (read->rd_filp)
492                 get_file(read->rd_filp);
493         status = nfs_ok;
494 out:
495         nfs4_unlock_state();
496         read->rd_rqstp = rqstp;
497         read->rd_fhp = current_fh;
498         return status;
499 }
500
501 static inline int
502 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
503 {
504         u64 cookie = readdir->rd_cookie;
505         static const nfs4_verifier zeroverf;
506
507         /* no need to check permission - this will be done in nfsd_readdir() */
508
509         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
510                 return nfserr_inval;
511
512         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
513         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
514
515         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
516             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
517                 return nfserr_bad_cookie;
518
519         readdir->rd_rqstp = rqstp;
520         readdir->rd_fhp = current_fh;
521         return nfs_ok;
522 }
523
524 static inline int
525 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
526 {
527         readlink->rl_rqstp = rqstp;
528         readlink->rl_fhp = current_fh;
529         return nfs_ok;
530 }
531
532 static inline int
533 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
534 {
535         int status;
536
537         if (nfs4_in_grace())
538                 return nfserr_grace;
539         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
540         if (status == nfserr_symlink)
541                 return nfserr_notdir;
542         if (!status) {
543                 fh_unlock(current_fh);
544                 set_change_info(&remove->rm_cinfo, current_fh);
545         }
546         return status;
547 }
548
549 static inline int
550 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
551              struct svc_fh *save_fh, struct nfsd4_rename *rename)
552 {
553         int status = nfserr_nofilehandle;
554
555         if (!save_fh->fh_dentry)
556                 return status;
557         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
558                                         & NFSEXP_NOSUBTREECHECK))
559                 return nfserr_grace;
560         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
561                              rename->rn_snamelen, current_fh,
562                              rename->rn_tname, rename->rn_tnamelen);
563
564         /* the underlying filesystem returns different error's than required
565          * by NFSv4. both save_fh and current_fh have been verified.. */
566         if (status == nfserr_isdir)
567                 status = nfserr_exist;
568         else if ((status == nfserr_notdir) &&
569                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
570                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
571                 status = nfserr_exist;
572         else if (status == nfserr_symlink)
573                 status = nfserr_notdir;
574
575         if (!status) {
576                 set_change_info(&rename->rn_sinfo, current_fh);
577                 set_change_info(&rename->rn_tinfo, save_fh);
578         }
579         return status;
580 }
581
582 static inline int
583 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
584 {
585         int status = nfs_ok;
586
587         if (!current_fh->fh_dentry)
588                 return nfserr_nofilehandle;
589
590         status = nfs_ok;
591         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
592                 nfs4_lock_state();
593                 if ((status = nfs4_preprocess_stateid_op(current_fh,
594                                                 &setattr->sa_stateid,
595                                                 CHECK_FH | WR_STATE, NULL))) {
596                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
597                         goto out_unlock;
598                 }
599                 nfs4_unlock_state();
600         }
601         status = nfs_ok;
602         if (setattr->sa_acl != NULL)
603                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
604         if (status)
605                 goto out;
606         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
607                                 0, (time_t)0);
608 out:
609         return status;
610 out_unlock:
611         nfs4_unlock_state();
612         return status;
613 }
614
615 static inline int
616 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
617 {
618         stateid_t *stateid = &write->wr_stateid;
619         struct file *filp = NULL;
620         u32 *p;
621         int status = nfs_ok;
622
623         /* no need to check permission - this will be done in nfsd_write() */
624
625         if (write->wr_offset >= OFFSET_MAX)
626                 return nfserr_inval;
627
628         nfs4_lock_state();
629         if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
630                                         CHECK_FH | WR_STATE, &filp))) {
631                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
632                 goto out;
633         }
634         if (filp)
635                 get_file(filp);
636         nfs4_unlock_state();
637
638         write->wr_bytes_written = write->wr_buflen;
639         write->wr_how_written = write->wr_stable_how;
640         p = (u32 *)write->wr_verifier.data;
641         *p++ = nfssvc_boot.tv_sec;
642         *p++ = nfssvc_boot.tv_usec;
643
644         status =  nfsd_write(rqstp, current_fh, filp, write->wr_offset,
645                         write->wr_vec, write->wr_vlen, write->wr_buflen,
646                         &write->wr_how_written);
647         if (filp)
648                 fput(filp);
649
650         if (status == nfserr_symlink)
651                 status = nfserr_inval;
652         return status;
653 out:
654         nfs4_unlock_state();
655         return status;
656 }
657
658 /* This routine never returns NFS_OK!  If there are no other errors, it
659  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
660  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
661  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
662  */
663 static int
664 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
665 {
666         u32 *buf, *p;
667         int count;
668         int status;
669
670         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
671         if (status)
672                 return status;
673
674         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
675             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
676                 return nfserr_attrnotsupp;
677         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
678             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
679                 return nfserr_inval;
680         if (verify->ve_attrlen & 3)
681                 return nfserr_inval;
682
683         /* count in words:
684          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
685          */
686         count = 4 + (verify->ve_attrlen >> 2);
687         buf = kmalloc(count << 2, GFP_KERNEL);
688         if (!buf)
689                 return nfserr_resource;
690
691         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
692                                     current_fh->fh_dentry, buf,
693                                     &count, verify->ve_bmval,
694                                     rqstp);
695
696         /* this means that nfsd4_encode_fattr() ran out of space */
697         if (status == nfserr_resource && count == 0)
698                 status = nfserr_not_same;
699         if (status)
700                 goto out_kfree;
701
702         p = buf + 3;
703         status = nfserr_not_same;
704         if (ntohl(*p++) != verify->ve_attrlen)
705                 goto out_kfree;
706         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
707                 status = nfserr_same;
708
709 out_kfree:
710         kfree(buf);
711         return status;
712 }
713
714 /*
715  * NULL call.
716  */
717 static int
718 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
719 {
720         return nfs_ok;
721 }
722
723
724 /*
725  * COMPOUND call.
726  */
727 static int
728 nfsd4_proc_compound(struct svc_rqst *rqstp,
729                     struct nfsd4_compoundargs *args,
730                     struct nfsd4_compoundres *resp)
731 {
732         struct nfsd4_op *op;
733         struct svc_fh   *current_fh = NULL;
734         struct svc_fh   *save_fh = NULL;
735         struct nfs4_stateowner *replay_owner = NULL;
736         int             slack_space;    /* in words, not bytes! */
737         int             status;
738
739         status = nfserr_resource;
740         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
741         if (current_fh == NULL)
742                 goto out;
743         fh_init(current_fh, NFS4_FHSIZE);
744         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
745         if (save_fh == NULL)
746                 goto out;
747         fh_init(save_fh, NFS4_FHSIZE);
748
749         resp->xbuf = &rqstp->rq_res;
750         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
751         resp->tagp = resp->p;
752         /* reserve space for: taglen, tag, and opcnt */
753         resp->p += 2 + XDR_QUADLEN(args->taglen);
754         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
755         resp->taglen = args->taglen;
756         resp->tag = args->tag;
757         resp->opcnt = 0;
758         resp->rqstp = rqstp;
759
760         /*
761          * According to RFC3010, this takes precedence over all other errors.
762          */
763         status = nfserr_minor_vers_mismatch;
764         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
765                 goto out;
766
767         status = nfs_ok;
768         while (!status && resp->opcnt < args->opcnt) {
769                 op = &args->ops[resp->opcnt++];
770
771                 /*
772                  * The XDR decode routines may have pre-set op->status;
773                  * for example, if there is a miscellaneous XDR error
774                  * it will be set to nfserr_bad_xdr.
775                  */
776                 if (op->status)
777                         goto encode_op;
778
779                 /* We must be able to encode a successful response to
780                  * this operation, with enough room left over to encode a
781                  * failed response to the next operation.  If we don't
782                  * have enough room, fail with ERR_RESOURCE.
783                  */
784 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
785                 slack_space = (char *)resp->end - (char *)resp->p;
786                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
787                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
788                         op->status = nfserr_resource;
789                         goto encode_op;
790                 }
791
792                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
793                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
794                 * require a valid current filehandle
795                 *
796                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
797                 * due to required returned bitmap argument
798                 */
799                 if ((!current_fh->fh_dentry) &&
800                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
801                    (op->opnum == OP_SETCLIENTID) ||
802                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
803                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
804                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
805                    (op->opnum == OP_SETATTR))) {
806                         op->status = nfserr_nofilehandle;
807                         goto encode_op;
808                 }
809                 switch (op->opnum) {
810                 case OP_ACCESS:
811                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
812                         break;
813                 case OP_CLOSE:
814                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner);
815                         break;
816                 case OP_COMMIT:
817                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
818                         break;
819                 case OP_CREATE:
820                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
821                         break;
822                 case OP_DELEGRETURN:
823                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
824                         break;
825                 case OP_GETATTR:
826                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
827                         break;
828                 case OP_GETFH:
829                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
830                         break;
831                 case OP_LINK:
832                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
833                         break;
834                 case OP_LOCK:
835                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner);
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, &replay_owner);
842                         break;
843                 case OP_LOOKUP:
844                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
845                         break;
846                 case OP_LOOKUPP:
847                         op->status = nfsd4_lookupp(rqstp, current_fh);
848                         break;
849                 case OP_NVERIFY:
850                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
851                         if (op->status == nfserr_not_same)
852                                 op->status = nfs_ok;
853                         break;
854                 case OP_OPEN:
855                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open, &replay_owner);
856                         break;
857                 case OP_OPEN_CONFIRM:
858                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner);
859                         break;
860                 case OP_OPEN_DOWNGRADE:
861                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner);
862                         break;
863                 case OP_PUTFH:
864                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
865                         break;
866                 case OP_PUTROOTFH:
867                         op->status = nfsd4_putrootfh(rqstp, current_fh);
868                         break;
869                 case OP_READ:
870                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
871                         break;
872                 case OP_READDIR:
873                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
874                         break;
875                 case OP_READLINK:
876                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
877                         break;
878                 case OP_REMOVE:
879                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
880                         break;
881                 case OP_RENAME:
882                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
883                         break;
884                 case OP_RENEW:
885                         op->status = nfsd4_renew(&op->u.renew);
886                         break;
887                 case OP_RESTOREFH:
888                         op->status = nfsd4_restorefh(current_fh, save_fh);
889                         break;
890                 case OP_SAVEFH:
891                         op->status = nfsd4_savefh(current_fh, save_fh);
892                         break;
893                 case OP_SETATTR:
894                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
895                         break;
896                 case OP_SETCLIENTID:
897                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
898                         break;
899                 case OP_SETCLIENTID_CONFIRM:
900                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
901                         break;
902                 case OP_VERIFY:
903                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
904                         if (op->status == nfserr_same)
905                                 op->status = nfs_ok;
906                         break;
907                 case OP_WRITE:
908                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
909                         break;
910                 case OP_RELEASE_LOCKOWNER:
911                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
912                         break;
913                 default:
914                         BUG_ON(op->status == nfs_ok);
915                         break;
916                 }
917
918 encode_op:
919                 if (op->status == NFSERR_REPLAY_ME) {
920                         op->replay = &replay_owner->so_replay;
921                         nfsd4_encode_replay(resp, op);
922                         status = op->status = op->replay->rp_status;
923                 } else {
924                         nfsd4_encode_operation(resp, op);
925                         status = op->status;
926                 }
927                 if (replay_owner && (replay_owner != (void *)(-1))) {
928                         nfs4_put_stateowner(replay_owner);
929                         replay_owner = NULL;
930                 }
931                 /* XXX Ugh, we need to get rid of this kind of special case: */
932                 if (op->opnum == OP_READ && op->u.read.rd_filp)
933                         fput(op->u.read.rd_filp);
934         }
935
936 out:
937         nfsd4_release_compoundargs(args);
938         if (current_fh)
939                 fh_put(current_fh);
940         kfree(current_fh);
941         if (save_fh)
942                 fh_put(save_fh);
943         kfree(save_fh);
944         return status;
945 }
946
947 #define nfs4svc_decode_voidargs         NULL
948 #define nfs4svc_release_void            NULL
949 #define nfsd4_voidres                   nfsd4_voidargs
950 #define nfs4svc_release_compound        NULL
951 struct nfsd4_voidargs { int dummy; };
952
953 #define PROC(name, argt, rest, relt, cache, respsize)   \
954  { (svc_procfunc) nfsd4_proc_##name,            \
955    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
956    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
957    (kxdrproc_t) nfs4svc_release_##relt,         \
958    sizeof(struct nfsd4_##argt##args),           \
959    sizeof(struct nfsd4_##rest##res),            \
960    0,                                           \
961    cache,                                       \
962    respsize,                                    \
963  }
964
965 /*
966  * TODO: At the present time, the NFSv4 server does not do XID caching
967  * of requests.  Implementing XID caching would not be a serious problem,
968  * although it would require a mild change in interfaces since one
969  * doesn't know whether an NFSv4 request is idempotent until after the
970  * XDR decode.  However, XID caching totally confuses pynfs (Peter
971  * Astrand's regression testsuite for NFSv4 servers), which reuses
972  * XID's liberally, so I've left it unimplemented until pynfs generates
973  * better XID's.
974  */
975 static struct svc_procedure             nfsd_procedures4[2] = {
976   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
977   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
978 };
979
980 struct svc_version      nfsd_version4 = {
981                 .vs_vers        = 4,
982                 .vs_nproc       = 2,
983                 .vs_proc        = nfsd_procedures4,
984                 .vs_dispatch    = nfsd_dispatch,
985                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
986 };
987
988 /*
989  * Local variables:
990  *  c-basic-offset: 8
991  * End:
992  */