nfsd41: exchange_id operation
[linux-2.6.git] / fs / nfsd / nfs4xdr.c
1 /*
2  *  Server-side XDR for NFSv4
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  *
35  * TODO: Neil Brown made the following observation:  We currently
36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
37  * never release any of that until the request is complete.
38  * It would be good to calculate a new maximum response size while
39  * decoding the COMPOUND, and call svc_reserve with this number
40  * at the end of nfs4svc_decode_compoundargs.
41  */
42
43 #include <linux/param.h>
44 #include <linux/smp.h>
45 #include <linux/fs.h>
46 #include <linux/namei.h>
47 #include <linux/vfs.h>
48 #include <linux/utsname.h>
49 #include <linux/sunrpc/xdr.h>
50 #include <linux/sunrpc/svc.h>
51 #include <linux/sunrpc/clnt.h>
52 #include <linux/nfsd/nfsd.h>
53 #include <linux/nfsd/state.h>
54 #include <linux/nfsd/xdr4.h>
55 #include <linux/nfsd_idmap.h>
56 #include <linux/nfs4.h>
57 #include <linux/nfs4_acl.h>
58 #include <linux/sunrpc/gss_api.h>
59 #include <linux/sunrpc/svcauth_gss.h>
60
61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
62
63 /*
64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
65  * directory in order to indicate to the client that a filesystem boundary is present
66  * We use a fixed fsid for a referral
67  */
68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
70
71 static __be32
72 check_filename(char *str, int len, __be32 err)
73 {
74         int i;
75
76         if (len == 0)
77                 return nfserr_inval;
78         if (isdotent(str, len))
79                 return err;
80         for (i = 0; i < len; i++)
81                 if (str[i] == '/')
82                         return err;
83         return 0;
84 }
85
86 /*
87  * START OF "GENERIC" DECODE ROUTINES.
88  *   These may look a little ugly since they are imported from a "generic"
89  * set of XDR encode/decode routines which are intended to be shared by
90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
91  *
92  * If the pain of reading these is too great, it should be a straightforward
93  * task to translate them into Linux-specific versions which are more
94  * consistent with the style used in NFSv2/v3...
95  */
96 #define DECODE_HEAD                             \
97         __be32 *p;                              \
98         __be32 status
99 #define DECODE_TAIL                             \
100         status = 0;                             \
101 out:                                            \
102         return status;                          \
103 xdr_error:                                      \
104         dprintk("NFSD: xdr error (%s:%d)\n",    \
105                         __FILE__, __LINE__);    \
106         status = nfserr_bad_xdr;                \
107         goto out
108
109 #define READ32(x)         (x) = ntohl(*p++)
110 #define READ64(x)         do {                  \
111         (x) = (u64)ntohl(*p++) << 32;           \
112         (x) |= ntohl(*p++);                     \
113 } while (0)
114 #define READTIME(x)       do {                  \
115         p++;                                    \
116         (x) = ntohl(*p++);                      \
117         p++;                                    \
118 } while (0)
119 #define READMEM(x,nbytes) do {                  \
120         x = (char *)p;                          \
121         p += XDR_QUADLEN(nbytes);               \
122 } while (0)
123 #define SAVEMEM(x,nbytes) do {                  \
124         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
125                 savemem(argp, p, nbytes) :      \
126                 (char *)p)) {                   \
127                 dprintk("NFSD: xdr error (%s:%d)\n", \
128                                 __FILE__, __LINE__); \
129                 goto xdr_error;                 \
130                 }                               \
131         p += XDR_QUADLEN(nbytes);               \
132 } while (0)
133 #define COPYMEM(x,nbytes) do {                  \
134         memcpy((x), p, nbytes);                 \
135         p += XDR_QUADLEN(nbytes);               \
136 } while (0)
137
138 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
139 #define READ_BUF(nbytes)  do {                  \
140         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
141                 p = argp->p;                    \
142                 argp->p += XDR_QUADLEN(nbytes); \
143         } else if (!(p = read_buf(argp, nbytes))) { \
144                 dprintk("NFSD: xdr error (%s:%d)\n", \
145                                 __FILE__, __LINE__); \
146                 goto xdr_error;                 \
147         }                                       \
148 } while (0)
149
150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
151 {
152         /* We want more bytes than seem to be available.
153          * Maybe we need a new page, maybe we have just run out
154          */
155         unsigned int avail = (char *)argp->end - (char *)argp->p;
156         __be32 *p;
157         if (avail + argp->pagelen < nbytes)
158                 return NULL;
159         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
160                 return NULL;
161         /* ok, we can do it with the current plus the next page */
162         if (nbytes <= sizeof(argp->tmp))
163                 p = argp->tmp;
164         else {
165                 kfree(argp->tmpp);
166                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
167                 if (!p)
168                         return NULL;
169                 
170         }
171         /*
172          * The following memcpy is safe because read_buf is always
173          * called with nbytes > avail, and the two cases above both
174          * guarantee p points to at least nbytes bytes.
175          */
176         memcpy(p, argp->p, avail);
177         /* step to next page */
178         argp->p = page_address(argp->pagelist[0]);
179         argp->pagelist++;
180         if (argp->pagelen < PAGE_SIZE) {
181                 argp->end = p + (argp->pagelen>>2);
182                 argp->pagelen = 0;
183         } else {
184                 argp->end = p + (PAGE_SIZE>>2);
185                 argp->pagelen -= PAGE_SIZE;
186         }
187         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
188         argp->p += XDR_QUADLEN(nbytes - avail);
189         return p;
190 }
191
192 static int
193 defer_free(struct nfsd4_compoundargs *argp,
194                 void (*release)(const void *), void *p)
195 {
196         struct tmpbuf *tb;
197
198         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
199         if (!tb)
200                 return -ENOMEM;
201         tb->buf = p;
202         tb->release = release;
203         tb->next = argp->to_free;
204         argp->to_free = tb;
205         return 0;
206 }
207
208 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
209 {
210         if (p == argp->tmp) {
211                 p = kmalloc(nbytes, GFP_KERNEL);
212                 if (!p)
213                         return NULL;
214                 memcpy(p, argp->tmp, nbytes);
215         } else {
216                 BUG_ON(p != argp->tmpp);
217                 argp->tmpp = NULL;
218         }
219         if (defer_free(argp, kfree, p)) {
220                 kfree(p);
221                 return NULL;
222         } else
223                 return (char *)p;
224 }
225
226 static __be32
227 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
228 {
229         u32 bmlen;
230         DECODE_HEAD;
231
232         bmval[0] = 0;
233         bmval[1] = 0;
234
235         READ_BUF(4);
236         READ32(bmlen);
237         if (bmlen > 1000)
238                 goto xdr_error;
239
240         READ_BUF(bmlen << 2);
241         if (bmlen > 0)
242                 READ32(bmval[0]);
243         if (bmlen > 1)
244                 READ32(bmval[1]);
245
246         DECODE_TAIL;
247 }
248
249 static __be32
250 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
251     struct nfs4_acl **acl)
252 {
253         int expected_len, len = 0;
254         u32 dummy32;
255         char *buf;
256         int host_err;
257
258         DECODE_HEAD;
259         iattr->ia_valid = 0;
260         if ((status = nfsd4_decode_bitmap(argp, bmval)))
261                 return status;
262
263         /*
264          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
265          * read-only attributes return ERR_INVAL.
266          */
267         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
268                 return nfserr_attrnotsupp;
269         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
270                 return nfserr_inval;
271
272         READ_BUF(4);
273         READ32(expected_len);
274
275         if (bmval[0] & FATTR4_WORD0_SIZE) {
276                 READ_BUF(8);
277                 len += 8;
278                 READ64(iattr->ia_size);
279                 iattr->ia_valid |= ATTR_SIZE;
280         }
281         if (bmval[0] & FATTR4_WORD0_ACL) {
282                 int nace;
283                 struct nfs4_ace *ace;
284
285                 READ_BUF(4); len += 4;
286                 READ32(nace);
287
288                 if (nace > NFS4_ACL_MAX)
289                         return nfserr_resource;
290
291                 *acl = nfs4_acl_new(nace);
292                 if (*acl == NULL) {
293                         host_err = -ENOMEM;
294                         goto out_nfserr;
295                 }
296                 defer_free(argp, kfree, *acl);
297
298                 (*acl)->naces = nace;
299                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
300                         READ_BUF(16); len += 16;
301                         READ32(ace->type);
302                         READ32(ace->flag);
303                         READ32(ace->access_mask);
304                         READ32(dummy32);
305                         READ_BUF(dummy32);
306                         len += XDR_QUADLEN(dummy32) << 2;
307                         READMEM(buf, dummy32);
308                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
309                         host_err = 0;
310                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
311                                 ace->who = 0;
312                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
313                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
314                                                 buf, dummy32, &ace->who);
315                         else
316                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
317                                                 buf, dummy32, &ace->who);
318                         if (host_err)
319                                 goto out_nfserr;
320                 }
321         } else
322                 *acl = NULL;
323         if (bmval[1] & FATTR4_WORD1_MODE) {
324                 READ_BUF(4);
325                 len += 4;
326                 READ32(iattr->ia_mode);
327                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
328                 iattr->ia_valid |= ATTR_MODE;
329         }
330         if (bmval[1] & FATTR4_WORD1_OWNER) {
331                 READ_BUF(4);
332                 len += 4;
333                 READ32(dummy32);
334                 READ_BUF(dummy32);
335                 len += (XDR_QUADLEN(dummy32) << 2);
336                 READMEM(buf, dummy32);
337                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
338                         goto out_nfserr;
339                 iattr->ia_valid |= ATTR_UID;
340         }
341         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
342                 READ_BUF(4);
343                 len += 4;
344                 READ32(dummy32);
345                 READ_BUF(dummy32);
346                 len += (XDR_QUADLEN(dummy32) << 2);
347                 READMEM(buf, dummy32);
348                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
349                         goto out_nfserr;
350                 iattr->ia_valid |= ATTR_GID;
351         }
352         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
353                 READ_BUF(4);
354                 len += 4;
355                 READ32(dummy32);
356                 switch (dummy32) {
357                 case NFS4_SET_TO_CLIENT_TIME:
358                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
359                            all 32 bits of 'nseconds'. */
360                         READ_BUF(12);
361                         len += 12;
362                         READ32(dummy32);
363                         if (dummy32)
364                                 return nfserr_inval;
365                         READ32(iattr->ia_atime.tv_sec);
366                         READ32(iattr->ia_atime.tv_nsec);
367                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
368                                 return nfserr_inval;
369                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
370                         break;
371                 case NFS4_SET_TO_SERVER_TIME:
372                         iattr->ia_valid |= ATTR_ATIME;
373                         break;
374                 default:
375                         goto xdr_error;
376                 }
377         }
378         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
379                 READ_BUF(4);
380                 len += 4;
381                 READ32(dummy32);
382                 switch (dummy32) {
383                 case NFS4_SET_TO_CLIENT_TIME:
384                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
385                            all 32 bits of 'nseconds'. */
386                         READ_BUF(12);
387                         len += 12;
388                         READ32(dummy32);
389                         if (dummy32)
390                                 return nfserr_inval;
391                         READ32(iattr->ia_mtime.tv_sec);
392                         READ32(iattr->ia_mtime.tv_nsec);
393                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
394                                 return nfserr_inval;
395                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
396                         break;
397                 case NFS4_SET_TO_SERVER_TIME:
398                         iattr->ia_valid |= ATTR_MTIME;
399                         break;
400                 default:
401                         goto xdr_error;
402                 }
403         }
404         if (len != expected_len)
405                 goto xdr_error;
406
407         DECODE_TAIL;
408
409 out_nfserr:
410         status = nfserrno(host_err);
411         goto out;
412 }
413
414 static __be32
415 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
416 {
417         DECODE_HEAD;
418
419         READ_BUF(sizeof(stateid_t));
420         READ32(sid->si_generation);
421         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
422
423         DECODE_TAIL;
424 }
425
426 static __be32
427 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
428 {
429         DECODE_HEAD;
430
431         READ_BUF(4);
432         READ32(access->ac_req_access);
433
434         DECODE_TAIL;
435 }
436
437 static __be32
438 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
439 {
440         DECODE_HEAD;
441
442         close->cl_stateowner = NULL;
443         READ_BUF(4);
444         READ32(close->cl_seqid);
445         return nfsd4_decode_stateid(argp, &close->cl_stateid);
446
447         DECODE_TAIL;
448 }
449
450
451 static __be32
452 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
453 {
454         DECODE_HEAD;
455
456         READ_BUF(12);
457         READ64(commit->co_offset);
458         READ32(commit->co_count);
459
460         DECODE_TAIL;
461 }
462
463 static __be32
464 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
465 {
466         DECODE_HEAD;
467
468         READ_BUF(4);
469         READ32(create->cr_type);
470         switch (create->cr_type) {
471         case NF4LNK:
472                 READ_BUF(4);
473                 READ32(create->cr_linklen);
474                 READ_BUF(create->cr_linklen);
475                 SAVEMEM(create->cr_linkname, create->cr_linklen);
476                 break;
477         case NF4BLK:
478         case NF4CHR:
479                 READ_BUF(8);
480                 READ32(create->cr_specdata1);
481                 READ32(create->cr_specdata2);
482                 break;
483         case NF4SOCK:
484         case NF4FIFO:
485         case NF4DIR:
486         default:
487                 break;
488         }
489
490         READ_BUF(4);
491         READ32(create->cr_namelen);
492         READ_BUF(create->cr_namelen);
493         SAVEMEM(create->cr_name, create->cr_namelen);
494         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
495                 return status;
496
497         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
498                 goto out;
499
500         DECODE_TAIL;
501 }
502
503 static inline __be32
504 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
505 {
506         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
507 }
508
509 static inline __be32
510 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
511 {
512         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
513 }
514
515 static __be32
516 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
517 {
518         DECODE_HEAD;
519
520         READ_BUF(4);
521         READ32(link->li_namelen);
522         READ_BUF(link->li_namelen);
523         SAVEMEM(link->li_name, link->li_namelen);
524         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
525                 return status;
526
527         DECODE_TAIL;
528 }
529
530 static __be32
531 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
532 {
533         DECODE_HEAD;
534
535         lock->lk_replay_owner = NULL;
536         /*
537         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
538         */
539         READ_BUF(28);
540         READ32(lock->lk_type);
541         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
542                 goto xdr_error;
543         READ32(lock->lk_reclaim);
544         READ64(lock->lk_offset);
545         READ64(lock->lk_length);
546         READ32(lock->lk_is_new);
547
548         if (lock->lk_is_new) {
549                 READ_BUF(4);
550                 READ32(lock->lk_new_open_seqid);
551                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
552                 if (status)
553                         return status;
554                 READ_BUF(8 + sizeof(clientid_t));
555                 READ32(lock->lk_new_lock_seqid);
556                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
557                 READ32(lock->lk_new_owner.len);
558                 READ_BUF(lock->lk_new_owner.len);
559                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
560         } else {
561                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
562                 if (status)
563                         return status;
564                 READ_BUF(4);
565                 READ32(lock->lk_old_lock_seqid);
566         }
567
568         DECODE_TAIL;
569 }
570
571 static __be32
572 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
573 {
574         DECODE_HEAD;
575                         
576         READ_BUF(32);
577         READ32(lockt->lt_type);
578         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
579                 goto xdr_error;
580         READ64(lockt->lt_offset);
581         READ64(lockt->lt_length);
582         COPYMEM(&lockt->lt_clientid, 8);
583         READ32(lockt->lt_owner.len);
584         READ_BUF(lockt->lt_owner.len);
585         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
586
587         DECODE_TAIL;
588 }
589
590 static __be32
591 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
592 {
593         DECODE_HEAD;
594
595         locku->lu_stateowner = NULL;
596         READ_BUF(8);
597         READ32(locku->lu_type);
598         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
599                 goto xdr_error;
600         READ32(locku->lu_seqid);
601         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
602         if (status)
603                 return status;
604         READ_BUF(16);
605         READ64(locku->lu_offset);
606         READ64(locku->lu_length);
607
608         DECODE_TAIL;
609 }
610
611 static __be32
612 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
613 {
614         DECODE_HEAD;
615
616         READ_BUF(4);
617         READ32(lookup->lo_len);
618         READ_BUF(lookup->lo_len);
619         SAVEMEM(lookup->lo_name, lookup->lo_len);
620         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
621                 return status;
622
623         DECODE_TAIL;
624 }
625
626 static __be32
627 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
628 {
629         DECODE_HEAD;
630
631         memset(open->op_bmval, 0, sizeof(open->op_bmval));
632         open->op_iattr.ia_valid = 0;
633         open->op_stateowner = NULL;
634
635         /* seqid, share_access, share_deny, clientid, ownerlen */
636         READ_BUF(16 + sizeof(clientid_t));
637         READ32(open->op_seqid);
638         READ32(open->op_share_access);
639         READ32(open->op_share_deny);
640         COPYMEM(&open->op_clientid, sizeof(clientid_t));
641         READ32(open->op_owner.len);
642
643         /* owner, open_flag */
644         READ_BUF(open->op_owner.len + 4);
645         SAVEMEM(open->op_owner.data, open->op_owner.len);
646         READ32(open->op_create);
647         switch (open->op_create) {
648         case NFS4_OPEN_NOCREATE:
649                 break;
650         case NFS4_OPEN_CREATE:
651                 READ_BUF(4);
652                 READ32(open->op_createmode);
653                 switch (open->op_createmode) {
654                 case NFS4_CREATE_UNCHECKED:
655                 case NFS4_CREATE_GUARDED:
656                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
657                                 goto out;
658                         break;
659                 case NFS4_CREATE_EXCLUSIVE:
660                         READ_BUF(8);
661                         COPYMEM(open->op_verf.data, 8);
662                         break;
663                 default:
664                         goto xdr_error;
665                 }
666                 break;
667         default:
668                 goto xdr_error;
669         }
670
671         /* open_claim */
672         READ_BUF(4);
673         READ32(open->op_claim_type);
674         switch (open->op_claim_type) {
675         case NFS4_OPEN_CLAIM_NULL:
676         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
677                 READ_BUF(4);
678                 READ32(open->op_fname.len);
679                 READ_BUF(open->op_fname.len);
680                 SAVEMEM(open->op_fname.data, open->op_fname.len);
681                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
682                         return status;
683                 break;
684         case NFS4_OPEN_CLAIM_PREVIOUS:
685                 READ_BUF(4);
686                 READ32(open->op_delegate_type);
687                 break;
688         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
689                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
690                 if (status)
691                         return status;
692                 READ_BUF(4);
693                 READ32(open->op_fname.len);
694                 READ_BUF(open->op_fname.len);
695                 SAVEMEM(open->op_fname.data, open->op_fname.len);
696                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
697                         return status;
698                 break;
699         default:
700                 goto xdr_error;
701         }
702
703         DECODE_TAIL;
704 }
705
706 static __be32
707 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
708 {
709         DECODE_HEAD;
710                     
711         open_conf->oc_stateowner = NULL;
712         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
713         if (status)
714                 return status;
715         READ_BUF(4);
716         READ32(open_conf->oc_seqid);
717                                                         
718         DECODE_TAIL;
719 }
720
721 static __be32
722 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
723 {
724         DECODE_HEAD;
725                     
726         open_down->od_stateowner = NULL;
727         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
728         if (status)
729                 return status;
730         READ_BUF(12);
731         READ32(open_down->od_seqid);
732         READ32(open_down->od_share_access);
733         READ32(open_down->od_share_deny);
734                                                         
735         DECODE_TAIL;
736 }
737
738 static __be32
739 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
740 {
741         DECODE_HEAD;
742
743         READ_BUF(4);
744         READ32(putfh->pf_fhlen);
745         if (putfh->pf_fhlen > NFS4_FHSIZE)
746                 goto xdr_error;
747         READ_BUF(putfh->pf_fhlen);
748         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
749
750         DECODE_TAIL;
751 }
752
753 static __be32
754 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
755 {
756         DECODE_HEAD;
757
758         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
759         if (status)
760                 return status;
761         READ_BUF(12);
762         READ64(read->rd_offset);
763         READ32(read->rd_length);
764
765         DECODE_TAIL;
766 }
767
768 static __be32
769 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
770 {
771         DECODE_HEAD;
772
773         READ_BUF(24);
774         READ64(readdir->rd_cookie);
775         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
776         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
777         READ32(readdir->rd_maxcount);
778         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
779                 goto out;
780
781         DECODE_TAIL;
782 }
783
784 static __be32
785 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
786 {
787         DECODE_HEAD;
788
789         READ_BUF(4);
790         READ32(remove->rm_namelen);
791         READ_BUF(remove->rm_namelen);
792         SAVEMEM(remove->rm_name, remove->rm_namelen);
793         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
794                 return status;
795
796         DECODE_TAIL;
797 }
798
799 static __be32
800 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
801 {
802         DECODE_HEAD;
803
804         READ_BUF(4);
805         READ32(rename->rn_snamelen);
806         READ_BUF(rename->rn_snamelen + 4);
807         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
808         READ32(rename->rn_tnamelen);
809         READ_BUF(rename->rn_tnamelen);
810         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
811         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
812                 return status;
813         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
814                 return status;
815
816         DECODE_TAIL;
817 }
818
819 static __be32
820 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
821 {
822         DECODE_HEAD;
823
824         READ_BUF(sizeof(clientid_t));
825         COPYMEM(clientid, sizeof(clientid_t));
826
827         DECODE_TAIL;
828 }
829
830 static __be32
831 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
832                      struct nfsd4_secinfo *secinfo)
833 {
834         DECODE_HEAD;
835
836         READ_BUF(4);
837         READ32(secinfo->si_namelen);
838         READ_BUF(secinfo->si_namelen);
839         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
840         status = check_filename(secinfo->si_name, secinfo->si_namelen,
841                                                                 nfserr_noent);
842         if (status)
843                 return status;
844         DECODE_TAIL;
845 }
846
847 static __be32
848 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
849 {
850         __be32 status;
851
852         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
853         if (status)
854                 return status;
855         return nfsd4_decode_fattr(argp, setattr->sa_bmval,
856                                   &setattr->sa_iattr, &setattr->sa_acl);
857 }
858
859 static __be32
860 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
861 {
862         DECODE_HEAD;
863
864         READ_BUF(12);
865         COPYMEM(setclientid->se_verf.data, 8);
866         READ32(setclientid->se_namelen);
867
868         READ_BUF(setclientid->se_namelen + 8);
869         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
870         READ32(setclientid->se_callback_prog);
871         READ32(setclientid->se_callback_netid_len);
872
873         READ_BUF(setclientid->se_callback_netid_len + 4);
874         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
875         READ32(setclientid->se_callback_addr_len);
876
877         READ_BUF(setclientid->se_callback_addr_len + 4);
878         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
879         READ32(setclientid->se_callback_ident);
880
881         DECODE_TAIL;
882 }
883
884 static __be32
885 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
886 {
887         DECODE_HEAD;
888
889         READ_BUF(8 + sizeof(nfs4_verifier));
890         COPYMEM(&scd_c->sc_clientid, 8);
891         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
892
893         DECODE_TAIL;
894 }
895
896 /* Also used for NVERIFY */
897 static __be32
898 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
899 {
900 #if 0
901         struct nfsd4_compoundargs save = {
902                 .p = argp->p,
903                 .end = argp->end,
904                 .rqstp = argp->rqstp,
905         };
906         u32             ve_bmval[2];
907         struct iattr    ve_iattr;           /* request */
908         struct nfs4_acl *ve_acl;            /* request */
909 #endif
910         DECODE_HEAD;
911
912         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
913                 goto out;
914
915         /* For convenience's sake, we compare raw xdr'd attributes in
916          * nfsd4_proc_verify; however we still decode here just to return
917          * correct error in case of bad xdr. */
918 #if 0
919         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
920         if (status == nfserr_inval) {
921                 status = nfserrno(status);
922                 goto out;
923         }
924 #endif
925         READ_BUF(4);
926         READ32(verify->ve_attrlen);
927         READ_BUF(verify->ve_attrlen);
928         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
929
930         DECODE_TAIL;
931 }
932
933 static __be32
934 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
935 {
936         int avail;
937         int v;
938         int len;
939         DECODE_HEAD;
940
941         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
942         if (status)
943                 return status;
944         READ_BUF(16);
945         READ64(write->wr_offset);
946         READ32(write->wr_stable_how);
947         if (write->wr_stable_how > 2)
948                 goto xdr_error;
949         READ32(write->wr_buflen);
950
951         /* Sorry .. no magic macros for this.. *
952          * READ_BUF(write->wr_buflen);
953          * SAVEMEM(write->wr_buf, write->wr_buflen);
954          */
955         avail = (char*)argp->end - (char*)argp->p;
956         if (avail + argp->pagelen < write->wr_buflen) {
957                 dprintk("NFSD: xdr error (%s:%d)\n",
958                                 __FILE__, __LINE__);
959                 goto xdr_error;
960         }
961         argp->rqstp->rq_vec[0].iov_base = p;
962         argp->rqstp->rq_vec[0].iov_len = avail;
963         v = 0;
964         len = write->wr_buflen;
965         while (len > argp->rqstp->rq_vec[v].iov_len) {
966                 len -= argp->rqstp->rq_vec[v].iov_len;
967                 v++;
968                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
969                 argp->pagelist++;
970                 if (argp->pagelen >= PAGE_SIZE) {
971                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
972                         argp->pagelen -= PAGE_SIZE;
973                 } else {
974                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
975                         argp->pagelen -= len;
976                 }
977         }
978         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
979         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
980         argp->rqstp->rq_vec[v].iov_len = len;
981         write->wr_vlen = v+1;
982
983         DECODE_TAIL;
984 }
985
986 static __be32
987 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
988 {
989         DECODE_HEAD;
990
991         READ_BUF(12);
992         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
993         READ32(rlockowner->rl_owner.len);
994         READ_BUF(rlockowner->rl_owner.len);
995         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
996
997         DECODE_TAIL;
998 }
999
1000 static __be32
1001 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1002                          struct nfsd4_exchange_id *exid)
1003 {
1004         int dummy;
1005         DECODE_HEAD;
1006
1007         READ_BUF(NFS4_VERIFIER_SIZE);
1008         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1009
1010         READ_BUF(4);
1011         READ32(exid->clname.len);
1012
1013         READ_BUF(exid->clname.len);
1014         SAVEMEM(exid->clname.data, exid->clname.len);
1015
1016         READ_BUF(4);
1017         READ32(exid->flags);
1018
1019         /* Ignore state_protect4_a */
1020         READ_BUF(4);
1021         READ32(exid->spa_how);
1022         switch (exid->spa_how) {
1023         case SP4_NONE:
1024                 break;
1025         case SP4_MACH_CRED:
1026                 /* spo_must_enforce */
1027                 READ_BUF(4);
1028                 READ32(dummy);
1029                 READ_BUF(dummy * 4);
1030                 p += dummy;
1031
1032                 /* spo_must_allow */
1033                 READ_BUF(4);
1034                 READ32(dummy);
1035                 READ_BUF(dummy * 4);
1036                 p += dummy;
1037                 break;
1038         case SP4_SSV:
1039                 /* ssp_ops */
1040                 READ_BUF(4);
1041                 READ32(dummy);
1042                 READ_BUF(dummy * 4);
1043                 p += dummy;
1044
1045                 READ_BUF(4);
1046                 READ32(dummy);
1047                 READ_BUF(dummy * 4);
1048                 p += dummy;
1049
1050                 /* ssp_hash_algs<> */
1051                 READ_BUF(4);
1052                 READ32(dummy);
1053                 READ_BUF(dummy);
1054                 p += XDR_QUADLEN(dummy);
1055
1056                 /* ssp_encr_algs<> */
1057                 READ_BUF(4);
1058                 READ32(dummy);
1059                 READ_BUF(dummy);
1060                 p += XDR_QUADLEN(dummy);
1061
1062                 /* ssp_window and ssp_num_gss_handles */
1063                 READ_BUF(8);
1064                 READ32(dummy);
1065                 READ32(dummy);
1066                 break;
1067         default:
1068                 goto xdr_error;
1069         }
1070
1071         /* Ignore Implementation ID */
1072         READ_BUF(4);    /* nfs_impl_id4 array length */
1073         READ32(dummy);
1074
1075         if (dummy > 1)
1076                 goto xdr_error;
1077
1078         if (dummy == 1) {
1079                 /* nii_domain */
1080                 READ_BUF(4);
1081                 READ32(dummy);
1082                 READ_BUF(dummy);
1083                 p += XDR_QUADLEN(dummy);
1084
1085                 /* nii_name */
1086                 READ_BUF(4);
1087                 READ32(dummy);
1088                 READ_BUF(dummy);
1089                 p += XDR_QUADLEN(dummy);
1090
1091                 /* nii_date */
1092                 READ_BUF(12);
1093                 p += 3;
1094         }
1095         DECODE_TAIL;
1096 }
1097
1098 static __be32
1099 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1100                             struct nfsd4_create_session *sess)
1101 {
1102         return nfserr_opnotsupp;        /* stub */
1103 }
1104
1105 static __be32
1106 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1107                              struct nfsd4_destroy_session *destroy_session)
1108 {
1109         return nfserr_opnotsupp;        /* stub */
1110 }
1111
1112 static __be32
1113 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1114                       struct nfsd4_sequence *seq)
1115 {
1116         return nfserr_opnotsupp;        /* stub */
1117 }
1118
1119 static __be32
1120 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1121 {
1122         return nfs_ok;
1123 }
1124
1125 static __be32
1126 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1127 {
1128         return nfserr_notsupp;
1129 }
1130
1131 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1132
1133 static nfsd4_dec nfsd4_dec_ops[] = {
1134         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1135         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1136         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1137         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1138         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1139         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1140         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1141         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1142         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1143         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1144         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1145         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1146         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1147         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1148         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1149         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1150         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1151         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1152         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1153         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1154         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1155         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1156         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1157         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1158         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1159         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1160         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1161         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1162         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1163         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1164         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1165         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1166         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1167         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1168         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1169         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1170         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1171 };
1172
1173 static nfsd4_dec nfsd41_dec_ops[] = {
1174         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1175         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1176         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1177         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1178         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1179         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1180         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1181         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1182         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1183         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1184         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1185         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1186         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1187         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1188         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1189         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1190         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1191         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_notsupp,
1192         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1193         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1194         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1195         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1196         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1197         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1198         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1199         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1200         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1201         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_notsupp,
1202         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1203         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1204         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1205         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1206         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_notsupp,
1207         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
1208         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1209         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1210         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_notsupp,
1211
1212         /* new operations for NFSv4.1 */
1213         [OP_BACKCHANNEL_CTL]    (nfsd4_dec)nfsd4_decode_notsupp,
1214         [OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
1215         [OP_EXCHANGE_ID]        (nfsd4_dec)nfsd4_decode_exchange_id,
1216         [OP_CREATE_SESSION]     (nfsd4_dec)nfsd4_decode_create_session,
1217         [OP_DESTROY_SESSION]    (nfsd4_dec)nfsd4_decode_destroy_session,
1218         [OP_FREE_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1219         [OP_GET_DIR_DELEGATION] (nfsd4_dec)nfsd4_decode_notsupp,
1220         [OP_GETDEVICEINFO]      (nfsd4_dec)nfsd4_decode_notsupp,
1221         [OP_GETDEVICELIST]      (nfsd4_dec)nfsd4_decode_notsupp,
1222         [OP_LAYOUTCOMMIT]       (nfsd4_dec)nfsd4_decode_notsupp,
1223         [OP_LAYOUTGET]          (nfsd4_dec)nfsd4_decode_notsupp,
1224         [OP_LAYOUTRETURN]       (nfsd4_dec)nfsd4_decode_notsupp,
1225         [OP_SECINFO_NO_NAME]    (nfsd4_dec)nfsd4_decode_notsupp,
1226         [OP_SEQUENCE]           (nfsd4_dec)nfsd4_decode_sequence,
1227         [OP_SET_SSV]            (nfsd4_dec)nfsd4_decode_notsupp,
1228         [OP_TEST_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1229         [OP_WANT_DELEGATION]    (nfsd4_dec)nfsd4_decode_notsupp,
1230         [OP_DESTROY_CLIENTID]   (nfsd4_dec)nfsd4_decode_notsupp,
1231         [OP_RECLAIM_COMPLETE]   (nfsd4_dec)nfsd4_decode_notsupp,
1232 };
1233
1234 struct nfsd4_minorversion_ops {
1235         nfsd4_dec *decoders;
1236         int nops;
1237 };
1238
1239 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1240         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1241         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1242 };
1243
1244 static __be32
1245 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1246 {
1247         DECODE_HEAD;
1248         struct nfsd4_op *op;
1249         struct nfsd4_minorversion_ops *ops;
1250         int i;
1251
1252         /*
1253          * XXX: According to spec, we should check the tag
1254          * for UTF-8 compliance.  I'm postponing this for
1255          * now because it seems that some clients do use
1256          * binary tags.
1257          */
1258         READ_BUF(4);
1259         READ32(argp->taglen);
1260         READ_BUF(argp->taglen + 8);
1261         SAVEMEM(argp->tag, argp->taglen);
1262         READ32(argp->minorversion);
1263         READ32(argp->opcnt);
1264
1265         if (argp->taglen > NFSD4_MAX_TAGLEN)
1266                 goto xdr_error;
1267         if (argp->opcnt > 100)
1268                 goto xdr_error;
1269
1270         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1271                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1272                 if (!argp->ops) {
1273                         argp->ops = argp->iops;
1274                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1275                         goto xdr_error;
1276                 }
1277         }
1278
1279         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1280                 argp->opcnt = 0;
1281
1282         ops = &nfsd4_minorversion[argp->minorversion];
1283         for (i = 0; i < argp->opcnt; i++) {
1284                 op = &argp->ops[i];
1285                 op->replay = NULL;
1286
1287                 /*
1288                  * We can't use READ_BUF() here because we need to handle
1289                  * a missing opcode as an OP_WRITE + 1. So we need to check
1290                  * to see if we're truly at the end of our buffer or if there
1291                  * is another page we need to flip to.
1292                  */
1293
1294                 if (argp->p == argp->end) {
1295                         if (argp->pagelen < 4) {
1296                                 /* There isn't an opcode still on the wire */
1297                                 op->opnum = OP_WRITE + 1;
1298                                 op->status = nfserr_bad_xdr;
1299                                 argp->opcnt = i+1;
1300                                 break;
1301                         }
1302
1303                         /*
1304                          * False alarm. We just hit a page boundary, but there
1305                          * is still data available.  Move pointer across page
1306                          * boundary.  *snip from READ_BUF*
1307                          */
1308                         argp->p = page_address(argp->pagelist[0]);
1309                         argp->pagelist++;
1310                         if (argp->pagelen < PAGE_SIZE) {
1311                                 argp->end = p + (argp->pagelen>>2);
1312                                 argp->pagelen = 0;
1313                         } else {
1314                                 argp->end = p + (PAGE_SIZE>>2);
1315                                 argp->pagelen -= PAGE_SIZE;
1316                         }
1317                 }
1318                 op->opnum = ntohl(*argp->p++);
1319
1320                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1321                         op->status = ops->decoders[op->opnum](argp, &op->u);
1322                 else {
1323                         op->opnum = OP_ILLEGAL;
1324                         op->status = nfserr_op_illegal;
1325                 }
1326
1327                 if (op->status) {
1328                         argp->opcnt = i+1;
1329                         break;
1330                 }
1331         }
1332
1333         DECODE_TAIL;
1334 }
1335 /*
1336  * END OF "GENERIC" DECODE ROUTINES.
1337  */
1338
1339 /*
1340  * START OF "GENERIC" ENCODE ROUTINES.
1341  *   These may look a little ugly since they are imported from a "generic"
1342  * set of XDR encode/decode routines which are intended to be shared by
1343  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1344  *
1345  * If the pain of reading these is too great, it should be a straightforward
1346  * task to translate them into Linux-specific versions which are more
1347  * consistent with the style used in NFSv2/v3...
1348  */
1349 #define ENCODE_HEAD              __be32 *p
1350
1351 #define WRITE32(n)               *p++ = htonl(n)
1352 #define WRITE64(n)               do {                           \
1353         *p++ = htonl((u32)((n) >> 32));                         \
1354         *p++ = htonl((u32)(n));                                 \
1355 } while (0)
1356 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1357         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1358         memcpy(p, ptr, nbytes);                                 \
1359         p += XDR_QUADLEN(nbytes);                               \
1360 }} while (0)
1361 #define WRITECINFO(c)           do {                            \
1362         *p++ = htonl(c.atomic);                                 \
1363         *p++ = htonl(c.before_ctime_sec);                               \
1364         *p++ = htonl(c.before_ctime_nsec);                              \
1365         *p++ = htonl(c.after_ctime_sec);                                \
1366         *p++ = htonl(c.after_ctime_nsec);                               \
1367 } while (0)
1368
1369 #define RESERVE_SPACE(nbytes)   do {                            \
1370         p = resp->p;                                            \
1371         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1372 } while (0)
1373 #define ADJUST_ARGS()           resp->p = p
1374
1375 /*
1376  * Header routine to setup seqid operation replay cache
1377  */
1378 #define ENCODE_SEQID_OP_HEAD                                    \
1379         __be32 *save;                                           \
1380                                                                 \
1381         save = resp->p;
1382
1383 /*
1384  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1385  * is where sequence id's are incremented, and the replay cache is filled.
1386  * Note that we increment sequence id's here, at the last moment, so we're sure
1387  * we know whether the error to be returned is a sequence id mutating error.
1388  */
1389
1390 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1391         if (seqid_mutating_err(nfserr) && stateowner) {         \
1392                 stateowner->so_seqid++;                         \
1393                 stateowner->so_replay.rp_status = nfserr;       \
1394                 stateowner->so_replay.rp_buflen =               \
1395                           (((char *)(resp)->p - (char *)save)); \
1396                 memcpy(stateowner->so_replay.rp_buf, save,      \
1397                         stateowner->so_replay.rp_buflen);       \
1398         } } while (0);
1399
1400 /* Encode as an array of strings the string given with components
1401  * seperated @sep.
1402  */
1403 static __be32 nfsd4_encode_components(char sep, char *components,
1404                                    __be32 **pp, int *buflen)
1405 {
1406         __be32 *p = *pp;
1407         __be32 *countp = p;
1408         int strlen, count=0;
1409         char *str, *end;
1410
1411         dprintk("nfsd4_encode_components(%s)\n", components);
1412         if ((*buflen -= 4) < 0)
1413                 return nfserr_resource;
1414         WRITE32(0); /* We will fill this in with @count later */
1415         end = str = components;
1416         while (*end) {
1417                 for (; *end && (*end != sep); end++)
1418                         ; /* Point to end of component */
1419                 strlen = end - str;
1420                 if (strlen) {
1421                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1422                                 return nfserr_resource;
1423                         WRITE32(strlen);
1424                         WRITEMEM(str, strlen);
1425                         count++;
1426                 }
1427                 else
1428                         end++;
1429                 str = end;
1430         }
1431         *pp = p;
1432         p = countp;
1433         WRITE32(count);
1434         return 0;
1435 }
1436
1437 /*
1438  * encode a location element of a fs_locations structure
1439  */
1440 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1441                                     __be32 **pp, int *buflen)
1442 {
1443         __be32 status;
1444         __be32 *p = *pp;
1445
1446         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1447         if (status)
1448                 return status;
1449         status = nfsd4_encode_components('/', location->path, &p, buflen);
1450         if (status)
1451                 return status;
1452         *pp = p;
1453         return 0;
1454 }
1455
1456 /*
1457  * Return the path to an export point in the pseudo filesystem namespace
1458  * Returned string is safe to use as long as the caller holds a reference
1459  * to @exp.
1460  */
1461 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1462 {
1463         struct svc_fh tmp_fh;
1464         char *path, *rootpath;
1465
1466         fh_init(&tmp_fh, NFS4_FHSIZE);
1467         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1468         if (*stat)
1469                 return NULL;
1470         rootpath = tmp_fh.fh_export->ex_pathname;
1471
1472         path = exp->ex_pathname;
1473
1474         if (strncmp(path, rootpath, strlen(rootpath))) {
1475                 dprintk("nfsd: fs_locations failed;"
1476                         "%s is not contained in %s\n", path, rootpath);
1477                 *stat = nfserr_notsupp;
1478                 return NULL;
1479         }
1480
1481         return path + strlen(rootpath);
1482 }
1483
1484 /*
1485  *  encode a fs_locations structure
1486  */
1487 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1488                                      struct svc_export *exp,
1489                                      __be32 **pp, int *buflen)
1490 {
1491         __be32 status;
1492         int i;
1493         __be32 *p = *pp;
1494         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1495         char *root = nfsd4_path(rqstp, exp, &status);
1496
1497         if (status)
1498                 return status;
1499         status = nfsd4_encode_components('/', root, &p, buflen);
1500         if (status)
1501                 return status;
1502         if ((*buflen -= 4) < 0)
1503                 return nfserr_resource;
1504         WRITE32(fslocs->locations_count);
1505         for (i=0; i<fslocs->locations_count; i++) {
1506                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1507                                                    &p, buflen);
1508                 if (status)
1509                         return status;
1510         }
1511         *pp = p;
1512         return 0;
1513 }
1514
1515 static u32 nfs4_ftypes[16] = {
1516         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1517         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1518         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1519         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1520 };
1521
1522 static __be32
1523 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1524                         __be32 **p, int *buflen)
1525 {
1526         int status;
1527
1528         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1529                 return nfserr_resource;
1530         if (whotype != NFS4_ACL_WHO_NAMED)
1531                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1532         else if (group)
1533                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1534         else
1535                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1536         if (status < 0)
1537                 return nfserrno(status);
1538         *p = xdr_encode_opaque(*p, NULL, status);
1539         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1540         BUG_ON(*buflen < 0);
1541         return 0;
1542 }
1543
1544 static inline __be32
1545 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1546 {
1547         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1548 }
1549
1550 static inline __be32
1551 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1552 {
1553         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1554 }
1555
1556 static inline __be32
1557 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1558                 __be32 **p, int *buflen)
1559 {
1560         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1561 }
1562
1563 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1564                               FATTR4_WORD0_RDATTR_ERROR)
1565 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1566
1567 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1568 {
1569         /* As per referral draft:  */
1570         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1571             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1572                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1573                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1574                         *rdattr_err = NFSERR_MOVED;
1575                 else
1576                         return nfserr_moved;
1577         }
1578         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1579         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1580         return 0;
1581 }
1582
1583 /*
1584  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1585  * ourselves.
1586  *
1587  * @countp is the buffer size in _words_; upon successful return this becomes
1588  * replaced with the number of words written.
1589  */
1590 __be32
1591 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1592                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1593                 struct svc_rqst *rqstp, int ignore_crossmnt)
1594 {
1595         u32 bmval0 = bmval[0];
1596         u32 bmval1 = bmval[1];
1597         struct kstat stat;
1598         struct svc_fh tempfh;
1599         struct kstatfs statfs;
1600         int buflen = *countp << 2;
1601         __be32 *attrlenp;
1602         u32 dummy;
1603         u64 dummy64;
1604         u32 rdattr_err = 0;
1605         __be32 *p = buffer;
1606         __be32 status;
1607         int err;
1608         int aclsupport = 0;
1609         struct nfs4_acl *acl = NULL;
1610
1611         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1612         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1613         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1614
1615         if (exp->ex_fslocs.migrated) {
1616                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1617                 if (status)
1618                         goto out;
1619         }
1620
1621         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1622         if (err)
1623                 goto out_nfserr;
1624         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1625                         FATTR4_WORD0_MAXNAME)) ||
1626             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1627                        FATTR4_WORD1_SPACE_TOTAL))) {
1628                 err = vfs_statfs(dentry, &statfs);
1629                 if (err)
1630                         goto out_nfserr;
1631         }
1632         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1633                 fh_init(&tempfh, NFS4_FHSIZE);
1634                 status = fh_compose(&tempfh, exp, dentry, NULL);
1635                 if (status)
1636                         goto out;
1637                 fhp = &tempfh;
1638         }
1639         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1640                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1641                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1642                 aclsupport = (err == 0);
1643                 if (bmval0 & FATTR4_WORD0_ACL) {
1644                         if (err == -EOPNOTSUPP)
1645                                 bmval0 &= ~FATTR4_WORD0_ACL;
1646                         else if (err == -EINVAL) {
1647                                 status = nfserr_attrnotsupp;
1648                                 goto out;
1649                         } else if (err != 0)
1650                                 goto out_nfserr;
1651                 }
1652         }
1653         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1654                 if (exp->ex_fslocs.locations == NULL) {
1655                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1656                 }
1657         }
1658         if ((buflen -= 16) < 0)
1659                 goto out_resource;
1660
1661         WRITE32(2);
1662         WRITE32(bmval0);
1663         WRITE32(bmval1);
1664         attrlenp = p++;                /* to be backfilled later */
1665
1666         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1667                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1668                 if ((buflen -= 12) < 0)
1669                         goto out_resource;
1670                 if (!aclsupport)
1671                         word0 &= ~FATTR4_WORD0_ACL;
1672                 if (!exp->ex_fslocs.locations)
1673                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1674                 WRITE32(2);
1675                 WRITE32(word0);
1676                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1677         }
1678         if (bmval0 & FATTR4_WORD0_TYPE) {
1679                 if ((buflen -= 4) < 0)
1680                         goto out_resource;
1681                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1682                 if (dummy == NF4BAD)
1683                         goto out_serverfault;
1684                 WRITE32(dummy);
1685         }
1686         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1687                 if ((buflen -= 4) < 0)
1688                         goto out_resource;
1689                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1690                         WRITE32(NFS4_FH_PERSISTENT);
1691                 else
1692                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1693         }
1694         if (bmval0 & FATTR4_WORD0_CHANGE) {
1695                 /*
1696                  * Note: This _must_ be consistent with the scheme for writing
1697                  * change_info, so any changes made here must be reflected there
1698                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1699                  * macro above.)
1700                  */
1701                 if ((buflen -= 8) < 0)
1702                         goto out_resource;
1703                 WRITE32(stat.ctime.tv_sec);
1704                 WRITE32(stat.ctime.tv_nsec);
1705         }
1706         if (bmval0 & FATTR4_WORD0_SIZE) {
1707                 if ((buflen -= 8) < 0)
1708                         goto out_resource;
1709                 WRITE64(stat.size);
1710         }
1711         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1712                 if ((buflen -= 4) < 0)
1713                         goto out_resource;
1714                 WRITE32(1);
1715         }
1716         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1717                 if ((buflen -= 4) < 0)
1718                         goto out_resource;
1719                 WRITE32(1);
1720         }
1721         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1722                 if ((buflen -= 4) < 0)
1723                         goto out_resource;
1724                 WRITE32(0);
1725         }
1726         if (bmval0 & FATTR4_WORD0_FSID) {
1727                 if ((buflen -= 16) < 0)
1728                         goto out_resource;
1729                 if (exp->ex_fslocs.migrated) {
1730                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1731                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1732                 } else switch(fsid_source(fhp)) {
1733                 case FSIDSOURCE_FSID:
1734                         WRITE64((u64)exp->ex_fsid);
1735                         WRITE64((u64)0);
1736                         break;
1737                 case FSIDSOURCE_DEV:
1738                         WRITE32(0);
1739                         WRITE32(MAJOR(stat.dev));
1740                         WRITE32(0);
1741                         WRITE32(MINOR(stat.dev));
1742                         break;
1743                 case FSIDSOURCE_UUID:
1744                         WRITEMEM(exp->ex_uuid, 16);
1745                         break;
1746                 }
1747         }
1748         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1749                 if ((buflen -= 4) < 0)
1750                         goto out_resource;
1751                 WRITE32(0);
1752         }
1753         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1754                 if ((buflen -= 4) < 0)
1755                         goto out_resource;
1756                 WRITE32(NFSD_LEASE_TIME);
1757         }
1758         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1759                 if ((buflen -= 4) < 0)
1760                         goto out_resource;
1761                 WRITE32(rdattr_err);
1762         }
1763         if (bmval0 & FATTR4_WORD0_ACL) {
1764                 struct nfs4_ace *ace;
1765
1766                 if (acl == NULL) {
1767                         if ((buflen -= 4) < 0)
1768                                 goto out_resource;
1769
1770                         WRITE32(0);
1771                         goto out_acl;
1772                 }
1773                 if ((buflen -= 4) < 0)
1774                         goto out_resource;
1775                 WRITE32(acl->naces);
1776
1777                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1778                         if ((buflen -= 4*3) < 0)
1779                                 goto out_resource;
1780                         WRITE32(ace->type);
1781                         WRITE32(ace->flag);
1782                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1783                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1784                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1785                                 &p, &buflen);
1786                         if (status == nfserr_resource)
1787                                 goto out_resource;
1788                         if (status)
1789                                 goto out;
1790                 }
1791         }
1792 out_acl:
1793         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1794                 if ((buflen -= 4) < 0)
1795                         goto out_resource;
1796                 WRITE32(aclsupport ?
1797                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1798         }
1799         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1800                 if ((buflen -= 4) < 0)
1801                         goto out_resource;
1802                 WRITE32(1);
1803         }
1804         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1805                 if ((buflen -= 4) < 0)
1806                         goto out_resource;
1807                 WRITE32(1);
1808         }
1809         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1810                 if ((buflen -= 4) < 0)
1811                         goto out_resource;
1812                 WRITE32(1);
1813         }
1814         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1815                 if ((buflen -= 4) < 0)
1816                         goto out_resource;
1817                 WRITE32(1);
1818         }
1819         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1820                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1821                 if (buflen < 0)
1822                         goto out_resource;
1823                 WRITE32(fhp->fh_handle.fh_size);
1824                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1825         }
1826         if (bmval0 & FATTR4_WORD0_FILEID) {
1827                 if ((buflen -= 8) < 0)
1828                         goto out_resource;
1829                 WRITE64(stat.ino);
1830         }
1831         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1832                 if ((buflen -= 8) < 0)
1833                         goto out_resource;
1834                 WRITE64((u64) statfs.f_ffree);
1835         }
1836         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1837                 if ((buflen -= 8) < 0)
1838                         goto out_resource;
1839                 WRITE64((u64) statfs.f_ffree);
1840         }
1841         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1842                 if ((buflen -= 8) < 0)
1843                         goto out_resource;
1844                 WRITE64((u64) statfs.f_files);
1845         }
1846         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1847                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1848                 if (status == nfserr_resource)
1849                         goto out_resource;
1850                 if (status)
1851                         goto out;
1852         }
1853         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1854                 if ((buflen -= 4) < 0)
1855                         goto out_resource;
1856                 WRITE32(1);
1857         }
1858         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1859                 if ((buflen -= 8) < 0)
1860                         goto out_resource;
1861                 WRITE64(~(u64)0);
1862         }
1863         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1864                 if ((buflen -= 4) < 0)
1865                         goto out_resource;
1866                 WRITE32(255);
1867         }
1868         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1869                 if ((buflen -= 4) < 0)
1870                         goto out_resource;
1871                 WRITE32(statfs.f_namelen);
1872         }
1873         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1874                 if ((buflen -= 8) < 0)
1875                         goto out_resource;
1876                 WRITE64((u64) svc_max_payload(rqstp));
1877         }
1878         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1879                 if ((buflen -= 8) < 0)
1880                         goto out_resource;
1881                 WRITE64((u64) svc_max_payload(rqstp));
1882         }
1883         if (bmval1 & FATTR4_WORD1_MODE) {
1884                 if ((buflen -= 4) < 0)
1885                         goto out_resource;
1886                 WRITE32(stat.mode & S_IALLUGO);
1887         }
1888         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1889                 if ((buflen -= 4) < 0)
1890                         goto out_resource;
1891                 WRITE32(1);
1892         }
1893         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1894                 if ((buflen -= 4) < 0)
1895                         goto out_resource;
1896                 WRITE32(stat.nlink);
1897         }
1898         if (bmval1 & FATTR4_WORD1_OWNER) {
1899                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1900                 if (status == nfserr_resource)
1901                         goto out_resource;
1902                 if (status)
1903                         goto out;
1904         }
1905         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1906                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1907                 if (status == nfserr_resource)
1908                         goto out_resource;
1909                 if (status)
1910                         goto out;
1911         }
1912         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1913                 if ((buflen -= 8) < 0)
1914                         goto out_resource;
1915                 WRITE32((u32) MAJOR(stat.rdev));
1916                 WRITE32((u32) MINOR(stat.rdev));
1917         }
1918         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1919                 if ((buflen -= 8) < 0)
1920                         goto out_resource;
1921                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1922                 WRITE64(dummy64);
1923         }
1924         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1925                 if ((buflen -= 8) < 0)
1926                         goto out_resource;
1927                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1928                 WRITE64(dummy64);
1929         }
1930         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1931                 if ((buflen -= 8) < 0)
1932                         goto out_resource;
1933                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1934                 WRITE64(dummy64);
1935         }
1936         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1937                 if ((buflen -= 8) < 0)
1938                         goto out_resource;
1939                 dummy64 = (u64)stat.blocks << 9;
1940                 WRITE64(dummy64);
1941         }
1942         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1943                 if ((buflen -= 12) < 0)
1944                         goto out_resource;
1945                 WRITE32(0);
1946                 WRITE32(stat.atime.tv_sec);
1947                 WRITE32(stat.atime.tv_nsec);
1948         }
1949         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1950                 if ((buflen -= 12) < 0)
1951                         goto out_resource;
1952                 WRITE32(0);
1953                 WRITE32(1);
1954                 WRITE32(0);
1955         }
1956         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1957                 if ((buflen -= 12) < 0)
1958                         goto out_resource;
1959                 WRITE32(0);
1960                 WRITE32(stat.ctime.tv_sec);
1961                 WRITE32(stat.ctime.tv_nsec);
1962         }
1963         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1964                 if ((buflen -= 12) < 0)
1965                         goto out_resource;
1966                 WRITE32(0);
1967                 WRITE32(stat.mtime.tv_sec);
1968                 WRITE32(stat.mtime.tv_nsec);
1969         }
1970         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1971                 if ((buflen -= 8) < 0)
1972                         goto out_resource;
1973                 /*
1974                  * Get parent's attributes if not ignoring crossmount
1975                  * and this is the root of a cross-mounted filesystem.
1976                  */
1977                 if (ignore_crossmnt == 0 &&
1978                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1979                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1980                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1981                         if (err)
1982                                 goto out_nfserr;
1983                 }
1984                 WRITE64(stat.ino);
1985         }
1986         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1987         *countp = p - buffer;
1988         status = nfs_ok;
1989
1990 out:
1991         kfree(acl);
1992         if (fhp == &tempfh)
1993                 fh_put(&tempfh);
1994         return status;
1995 out_nfserr:
1996         status = nfserrno(err);
1997         goto out;
1998 out_resource:
1999         *countp = 0;
2000         status = nfserr_resource;
2001         goto out;
2002 out_serverfault:
2003         status = nfserr_serverfault;
2004         goto out;
2005 }
2006
2007 static inline int attributes_need_mount(u32 *bmval)
2008 {
2009         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2010                 return 1;
2011         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2012                 return 1;
2013         return 0;
2014 }
2015
2016 static __be32
2017 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2018                 const char *name, int namlen, __be32 *p, int *buflen)
2019 {
2020         struct svc_export *exp = cd->rd_fhp->fh_export;
2021         struct dentry *dentry;
2022         __be32 nfserr;
2023         int ignore_crossmnt = 0;
2024
2025         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2026         if (IS_ERR(dentry))
2027                 return nfserrno(PTR_ERR(dentry));
2028
2029         exp_get(exp);
2030         /*
2031          * In the case of a mountpoint, the client may be asking for
2032          * attributes that are only properties of the underlying filesystem
2033          * as opposed to the cross-mounted file system. In such a case,
2034          * we will not follow the cross mount and will fill the attribtutes
2035          * directly from the mountpoint dentry.
2036          */
2037         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2038                 ignore_crossmnt = 1;
2039         else if (d_mountpoint(dentry)) {
2040                 int err;
2041
2042                 /*
2043                  * Why the heck aren't we just using nfsd_lookup??
2044                  * Different "."/".." handling?  Something else?
2045                  * At least, add a comment here to explain....
2046                  */
2047                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2048                 if (err) {
2049                         nfserr = nfserrno(err);
2050                         goto out_put;
2051                 }
2052                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2053                 if (nfserr)
2054                         goto out_put;
2055
2056         }
2057         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2058                                         cd->rd_rqstp, ignore_crossmnt);
2059 out_put:
2060         dput(dentry);
2061         exp_put(exp);
2062         return nfserr;
2063 }
2064
2065 static __be32 *
2066 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2067 {
2068         __be32 *attrlenp;
2069
2070         if (buflen < 6)
2071                 return NULL;
2072         *p++ = htonl(2);
2073         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2074         *p++ = htonl(0);                         /* bmval1 */
2075
2076         attrlenp = p++;
2077         *p++ = nfserr;       /* no htonl */
2078         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2079         return p;
2080 }
2081
2082 static int
2083 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2084                     loff_t offset, u64 ino, unsigned int d_type)
2085 {
2086         struct readdir_cd *ccd = ccdv;
2087         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2088         int buflen;
2089         __be32 *p = cd->buffer;
2090         __be32 nfserr = nfserr_toosmall;
2091
2092         /* In nfsv4, "." and ".." never make it onto the wire.. */
2093         if (name && isdotent(name, namlen)) {
2094                 cd->common.err = nfs_ok;
2095                 return 0;
2096         }
2097
2098         if (cd->offset)
2099                 xdr_encode_hyper(cd->offset, (u64) offset);
2100
2101         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2102         if (buflen < 0)
2103                 goto fail;
2104
2105         *p++ = xdr_one;                             /* mark entry present */
2106         cd->offset = p;                             /* remember pointer */
2107         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2108         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2109
2110         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2111         switch (nfserr) {
2112         case nfs_ok:
2113                 p += buflen;
2114                 break;
2115         case nfserr_resource:
2116                 nfserr = nfserr_toosmall;
2117                 goto fail;
2118         case nfserr_dropit:
2119                 goto fail;
2120         default:
2121                 /*
2122                  * If the client requested the RDATTR_ERROR attribute,
2123                  * we stuff the error code into this attribute
2124                  * and continue.  If this attribute was not requested,
2125                  * then in accordance with the spec, we fail the
2126                  * entire READDIR operation(!)
2127                  */
2128                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2129                         goto fail;
2130                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2131                 if (p == NULL) {
2132                         nfserr = nfserr_toosmall;
2133                         goto fail;
2134                 }
2135         }
2136         cd->buflen -= (p - cd->buffer);
2137         cd->buffer = p;
2138         cd->common.err = nfs_ok;
2139         return 0;
2140 fail:
2141         cd->common.err = nfserr;
2142         return -EINVAL;
2143 }
2144
2145 static void
2146 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2147 {
2148         ENCODE_HEAD;
2149
2150         RESERVE_SPACE(sizeof(stateid_t));
2151         WRITE32(sid->si_generation);
2152         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2153         ADJUST_ARGS();
2154 }
2155
2156 static __be32
2157 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2158 {
2159         ENCODE_HEAD;
2160
2161         if (!nfserr) {
2162                 RESERVE_SPACE(8);
2163                 WRITE32(access->ac_supported);
2164                 WRITE32(access->ac_resp_access);
2165                 ADJUST_ARGS();
2166         }
2167         return nfserr;
2168 }
2169
2170 static __be32
2171 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2172 {
2173         ENCODE_SEQID_OP_HEAD;
2174
2175         if (!nfserr)
2176                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2177
2178         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2179         return nfserr;
2180 }
2181
2182
2183 static __be32
2184 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2185 {
2186         ENCODE_HEAD;
2187
2188         if (!nfserr) {
2189                 RESERVE_SPACE(8);
2190                 WRITEMEM(commit->co_verf.data, 8);
2191                 ADJUST_ARGS();
2192         }
2193         return nfserr;
2194 }
2195
2196 static __be32
2197 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2198 {
2199         ENCODE_HEAD;
2200
2201         if (!nfserr) {
2202                 RESERVE_SPACE(32);
2203                 WRITECINFO(create->cr_cinfo);
2204                 WRITE32(2);
2205                 WRITE32(create->cr_bmval[0]);
2206                 WRITE32(create->cr_bmval[1]);
2207                 ADJUST_ARGS();
2208         }
2209         return nfserr;
2210 }
2211
2212 static __be32
2213 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2214 {
2215         struct svc_fh *fhp = getattr->ga_fhp;
2216         int buflen;
2217
2218         if (nfserr)
2219                 return nfserr;
2220
2221         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2222         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2223                                     resp->p, &buflen, getattr->ga_bmval,
2224                                     resp->rqstp, 0);
2225         if (!nfserr)
2226                 resp->p += buflen;
2227         return nfserr;
2228 }
2229
2230 static __be32
2231 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2232 {
2233         struct svc_fh *fhp = *fhpp;
2234         unsigned int len;
2235         ENCODE_HEAD;
2236
2237         if (!nfserr) {
2238                 len = fhp->fh_handle.fh_size;
2239                 RESERVE_SPACE(len + 4);
2240                 WRITE32(len);
2241                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2242                 ADJUST_ARGS();
2243         }
2244         return nfserr;
2245 }
2246
2247 /*
2248 * Including all fields other than the name, a LOCK4denied structure requires
2249 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2250 */
2251 static void
2252 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2253 {
2254         ENCODE_HEAD;
2255
2256         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2257         WRITE64(ld->ld_start);
2258         WRITE64(ld->ld_length);
2259         WRITE32(ld->ld_type);
2260         if (ld->ld_sop) {
2261                 WRITEMEM(&ld->ld_clientid, 8);
2262                 WRITE32(ld->ld_sop->so_owner.len);
2263                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2264                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2265         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2266                 WRITE64((u64)0); /* clientid */
2267                 WRITE32(0); /* length of owner name */
2268         }
2269         ADJUST_ARGS();
2270 }
2271
2272 static __be32
2273 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2274 {
2275         ENCODE_SEQID_OP_HEAD;
2276
2277         if (!nfserr)
2278                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2279         else if (nfserr == nfserr_denied)
2280                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2281
2282         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2283         return nfserr;
2284 }
2285
2286 static __be32
2287 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2288 {
2289         if (nfserr == nfserr_denied)
2290                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2291         return nfserr;
2292 }
2293
2294 static __be32
2295 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2296 {
2297         ENCODE_SEQID_OP_HEAD;
2298
2299         if (!nfserr)
2300                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2301
2302         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2303         return nfserr;
2304 }
2305
2306
2307 static __be32
2308 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2309 {
2310         ENCODE_HEAD;
2311
2312         if (!nfserr) {
2313                 RESERVE_SPACE(20);
2314                 WRITECINFO(link->li_cinfo);
2315                 ADJUST_ARGS();
2316         }
2317         return nfserr;
2318 }
2319
2320
2321 static __be32
2322 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2323 {
2324         ENCODE_HEAD;
2325         ENCODE_SEQID_OP_HEAD;
2326
2327         if (nfserr)
2328                 goto out;
2329
2330         nfsd4_encode_stateid(resp, &open->op_stateid);
2331         RESERVE_SPACE(40);
2332         WRITECINFO(open->op_cinfo);
2333         WRITE32(open->op_rflags);
2334         WRITE32(2);
2335         WRITE32(open->op_bmval[0]);
2336         WRITE32(open->op_bmval[1]);
2337         WRITE32(open->op_delegate_type);
2338         ADJUST_ARGS();
2339
2340         switch (open->op_delegate_type) {
2341         case NFS4_OPEN_DELEGATE_NONE:
2342                 break;
2343         case NFS4_OPEN_DELEGATE_READ:
2344                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2345                 RESERVE_SPACE(20);
2346                 WRITE32(open->op_recall);
2347
2348                 /*
2349                  * TODO: ACE's in delegations
2350                  */
2351                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2352                 WRITE32(0);
2353                 WRITE32(0);
2354                 WRITE32(0);   /* XXX: is NULL principal ok? */
2355                 ADJUST_ARGS();
2356                 break;
2357         case NFS4_OPEN_DELEGATE_WRITE:
2358                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2359                 RESERVE_SPACE(32);
2360                 WRITE32(0);
2361
2362                 /*
2363                  * TODO: space_limit's in delegations
2364                  */
2365                 WRITE32(NFS4_LIMIT_SIZE);
2366                 WRITE32(~(u32)0);
2367                 WRITE32(~(u32)0);
2368
2369                 /*
2370                  * TODO: ACE's in delegations
2371                  */
2372                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2373                 WRITE32(0);
2374                 WRITE32(0);
2375                 WRITE32(0);   /* XXX: is NULL principal ok? */
2376                 ADJUST_ARGS();
2377                 break;
2378         default:
2379                 BUG();
2380         }
2381         /* XXX save filehandle here */
2382 out:
2383         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2384         return nfserr;
2385 }
2386
2387 static __be32
2388 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2389 {
2390         ENCODE_SEQID_OP_HEAD;
2391
2392         if (!nfserr)
2393                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2394
2395         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2396         return nfserr;
2397 }
2398
2399 static __be32
2400 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2401 {
2402         ENCODE_SEQID_OP_HEAD;
2403
2404         if (!nfserr)
2405                 nfsd4_encode_stateid(resp, &od->od_stateid);
2406
2407         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2408         return nfserr;
2409 }
2410
2411 static __be32
2412 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2413                   struct nfsd4_read *read)
2414 {
2415         u32 eof;
2416         int v, pn;
2417         unsigned long maxcount; 
2418         long len;
2419         ENCODE_HEAD;
2420
2421         if (nfserr)
2422                 return nfserr;
2423         if (resp->xbuf->page_len)
2424                 return nfserr_resource;
2425
2426         RESERVE_SPACE(8); /* eof flag and byte count */
2427
2428         maxcount = svc_max_payload(resp->rqstp);
2429         if (maxcount > read->rd_length)
2430                 maxcount = read->rd_length;
2431
2432         len = maxcount;
2433         v = 0;
2434         while (len > 0) {
2435                 pn = resp->rqstp->rq_resused++;
2436                 resp->rqstp->rq_vec[v].iov_base =
2437                         page_address(resp->rqstp->rq_respages[pn]);
2438                 resp->rqstp->rq_vec[v].iov_len =
2439                         len < PAGE_SIZE ? len : PAGE_SIZE;
2440                 v++;
2441                 len -= PAGE_SIZE;
2442         }
2443         read->rd_vlen = v;
2444
2445         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2446                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2447                         &maxcount);
2448
2449         if (nfserr == nfserr_symlink)
2450                 nfserr = nfserr_inval;
2451         if (nfserr)
2452                 return nfserr;
2453         eof = (read->rd_offset + maxcount >=
2454                read->rd_fhp->fh_dentry->d_inode->i_size);
2455
2456         WRITE32(eof);
2457         WRITE32(maxcount);
2458         ADJUST_ARGS();
2459         resp->xbuf->head[0].iov_len = (char*)p
2460                                         - (char*)resp->xbuf->head[0].iov_base;
2461         resp->xbuf->page_len = maxcount;
2462
2463         /* Use rest of head for padding and remaining ops: */
2464         resp->xbuf->tail[0].iov_base = p;
2465         resp->xbuf->tail[0].iov_len = 0;
2466         if (maxcount&3) {
2467                 RESERVE_SPACE(4);
2468                 WRITE32(0);
2469                 resp->xbuf->tail[0].iov_base += maxcount&3;
2470                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2471                 ADJUST_ARGS();
2472         }
2473         return 0;
2474 }
2475
2476 static __be32
2477 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2478 {
2479         int maxcount;
2480         char *page;
2481         ENCODE_HEAD;
2482
2483         if (nfserr)
2484                 return nfserr;
2485         if (resp->xbuf->page_len)
2486                 return nfserr_resource;
2487
2488         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2489
2490         maxcount = PAGE_SIZE;
2491         RESERVE_SPACE(4);
2492
2493         /*
2494          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2495          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2496          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2497          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2498          */
2499         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2500         if (nfserr == nfserr_isdir)
2501                 return nfserr_inval;
2502         if (nfserr)
2503                 return nfserr;
2504
2505         WRITE32(maxcount);
2506         ADJUST_ARGS();
2507         resp->xbuf->head[0].iov_len = (char*)p
2508                                 - (char*)resp->xbuf->head[0].iov_base;
2509         resp->xbuf->page_len = maxcount;
2510
2511         /* Use rest of head for padding and remaining ops: */
2512         resp->xbuf->tail[0].iov_base = p;
2513         resp->xbuf->tail[0].iov_len = 0;
2514         if (maxcount&3) {
2515                 RESERVE_SPACE(4);
2516                 WRITE32(0);
2517                 resp->xbuf->tail[0].iov_base += maxcount&3;
2518                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2519                 ADJUST_ARGS();
2520         }
2521         return 0;
2522 }
2523
2524 static __be32
2525 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2526 {
2527         int maxcount;
2528         loff_t offset;
2529         __be32 *page, *savep, *tailbase;
2530         ENCODE_HEAD;
2531
2532         if (nfserr)
2533                 return nfserr;
2534         if (resp->xbuf->page_len)
2535                 return nfserr_resource;
2536
2537         RESERVE_SPACE(8);  /* verifier */
2538         savep = p;
2539
2540         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2541         WRITE32(0);
2542         WRITE32(0);
2543         ADJUST_ARGS();
2544         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2545         tailbase = p;
2546
2547         maxcount = PAGE_SIZE;
2548         if (maxcount > readdir->rd_maxcount)
2549                 maxcount = readdir->rd_maxcount;
2550
2551         /*
2552          * Convert from bytes to words, account for the two words already
2553          * written, make sure to leave two words at the end for the next
2554          * pointer and eof field.
2555          */
2556         maxcount = (maxcount >> 2) - 4;
2557         if (maxcount < 0) {
2558                 nfserr =  nfserr_toosmall;
2559                 goto err_no_verf;
2560         }
2561
2562         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2563         readdir->common.err = 0;
2564         readdir->buflen = maxcount;
2565         readdir->buffer = page;
2566         readdir->offset = NULL;
2567
2568         offset = readdir->rd_cookie;
2569         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2570                               &offset,
2571                               &readdir->common, nfsd4_encode_dirent);
2572         if (nfserr == nfs_ok &&
2573             readdir->common.err == nfserr_toosmall &&
2574             readdir->buffer == page) 
2575                 nfserr = nfserr_toosmall;
2576         if (nfserr == nfserr_symlink)
2577                 nfserr = nfserr_notdir;
2578         if (nfserr)
2579                 goto err_no_verf;
2580
2581         if (readdir->offset)
2582                 xdr_encode_hyper(readdir->offset, offset);
2583
2584         p = readdir->buffer;
2585         *p++ = 0;       /* no more entries */
2586         *p++ = htonl(readdir->common.err == nfserr_eof);
2587         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2588                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2589
2590         /* Use rest of head for padding and remaining ops: */
2591         resp->xbuf->tail[0].iov_base = tailbase;
2592         resp->xbuf->tail[0].iov_len = 0;
2593         resp->p = resp->xbuf->tail[0].iov_base;
2594         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2595
2596         return 0;
2597 err_no_verf:
2598         p = savep;
2599         ADJUST_ARGS();
2600         return nfserr;
2601 }
2602
2603 static __be32
2604 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2605 {
2606         ENCODE_HEAD;
2607
2608         if (!nfserr) {
2609                 RESERVE_SPACE(20);
2610                 WRITECINFO(remove->rm_cinfo);
2611                 ADJUST_ARGS();
2612         }
2613         return nfserr;
2614 }
2615
2616 static __be32
2617 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2618 {
2619         ENCODE_HEAD;
2620
2621         if (!nfserr) {
2622                 RESERVE_SPACE(40);
2623                 WRITECINFO(rename->rn_sinfo);
2624                 WRITECINFO(rename->rn_tinfo);
2625                 ADJUST_ARGS();
2626         }
2627         return nfserr;
2628 }
2629
2630 static __be32
2631 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2632                      struct nfsd4_secinfo *secinfo)
2633 {
2634         int i = 0;
2635         struct svc_export *exp = secinfo->si_exp;
2636         u32 nflavs;
2637         struct exp_flavor_info *flavs;
2638         struct exp_flavor_info def_flavs[2];
2639         ENCODE_HEAD;
2640
2641         if (nfserr)
2642                 goto out;
2643         if (exp->ex_nflavors) {
2644                 flavs = exp->ex_flavors;
2645                 nflavs = exp->ex_nflavors;
2646         } else { /* Handling of some defaults in absence of real secinfo: */
2647                 flavs = def_flavs;
2648                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2649                         nflavs = 2;
2650                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2651                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2652                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2653                         nflavs = 1;
2654                         flavs[0].pseudoflavor
2655                                         = svcauth_gss_flavor(exp->ex_client);
2656                 } else {
2657                         nflavs = 1;
2658                         flavs[0].pseudoflavor
2659                                         = exp->ex_client->flavour->flavour;
2660                 }
2661         }
2662
2663         RESERVE_SPACE(4);
2664         WRITE32(nflavs);
2665         ADJUST_ARGS();
2666         for (i = 0; i < nflavs; i++) {
2667                 u32 flav = flavs[i].pseudoflavor;
2668                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2669
2670                 if (gm) {
2671                         RESERVE_SPACE(4);
2672                         WRITE32(RPC_AUTH_GSS);
2673                         ADJUST_ARGS();
2674                         RESERVE_SPACE(4 + gm->gm_oid.len);
2675                         WRITE32(gm->gm_oid.len);
2676                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2677                         ADJUST_ARGS();
2678                         RESERVE_SPACE(4);
2679                         WRITE32(0); /* qop */
2680                         ADJUST_ARGS();
2681                         RESERVE_SPACE(4);
2682                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2683                         ADJUST_ARGS();
2684                         gss_mech_put(gm);
2685                 } else {
2686                         RESERVE_SPACE(4);
2687                         WRITE32(flav);
2688                         ADJUST_ARGS();
2689                 }
2690         }
2691 out:
2692         if (exp)
2693                 exp_put(exp);
2694         return nfserr;
2695 }
2696
2697 /*
2698  * The SETATTR encode routine is special -- it always encodes a bitmap,
2699  * regardless of the error status.
2700  */
2701 static __be32
2702 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2703 {
2704         ENCODE_HEAD;
2705
2706         RESERVE_SPACE(12);
2707         if (nfserr) {
2708                 WRITE32(2);
2709                 WRITE32(0);
2710                 WRITE32(0);
2711         }
2712         else {
2713                 WRITE32(2);
2714                 WRITE32(setattr->sa_bmval[0]);
2715                 WRITE32(setattr->sa_bmval[1]);
2716         }
2717         ADJUST_ARGS();
2718         return nfserr;
2719 }
2720
2721 static __be32
2722 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2723 {
2724         ENCODE_HEAD;
2725
2726         if (!nfserr) {
2727                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2728                 WRITEMEM(&scd->se_clientid, 8);
2729                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2730                 ADJUST_ARGS();
2731         }
2732         else if (nfserr == nfserr_clid_inuse) {
2733                 RESERVE_SPACE(8);
2734                 WRITE32(0);
2735                 WRITE32(0);
2736                 ADJUST_ARGS();
2737         }
2738         return nfserr;
2739 }
2740
2741 static __be32
2742 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2743 {
2744         ENCODE_HEAD;
2745
2746         if (!nfserr) {
2747                 RESERVE_SPACE(16);
2748                 WRITE32(write->wr_bytes_written);
2749                 WRITE32(write->wr_how_written);
2750                 WRITEMEM(write->wr_verifier.data, 8);
2751                 ADJUST_ARGS();
2752         }
2753         return nfserr;
2754 }
2755
2756 static __be32
2757 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2758                          struct nfsd4_exchange_id *exid)
2759 {
2760         ENCODE_HEAD;
2761         char *major_id;
2762         char *server_scope;
2763         int major_id_sz;
2764         int server_scope_sz;
2765         uint64_t minor_id = 0;
2766
2767         if (nfserr)
2768                 return nfserr;
2769
2770         major_id = utsname()->nodename;
2771         major_id_sz = strlen(major_id);
2772         server_scope = utsname()->nodename;
2773         server_scope_sz = strlen(server_scope);
2774
2775         RESERVE_SPACE(
2776                 8 /* eir_clientid */ +
2777                 4 /* eir_sequenceid */ +
2778                 4 /* eir_flags */ +
2779                 4 /* spr_how (SP4_NONE) */ +
2780                 8 /* so_minor_id */ +
2781                 4 /* so_major_id.len */ +
2782                 (XDR_QUADLEN(major_id_sz) * 4) +
2783                 4 /* eir_server_scope.len */ +
2784                 (XDR_QUADLEN(server_scope_sz) * 4) +
2785                 4 /* eir_server_impl_id.count (0) */);
2786
2787         WRITEMEM(&exid->clientid, 8);
2788         WRITE32(exid->seqid);
2789         WRITE32(exid->flags);
2790
2791         /* state_protect4_r. Currently only support SP4_NONE */
2792         BUG_ON(exid->spa_how != SP4_NONE);
2793         WRITE32(exid->spa_how);
2794
2795         /* The server_owner struct */
2796         WRITE64(minor_id);      /* Minor id */
2797         /* major id */
2798         WRITE32(major_id_sz);
2799         WRITEMEM(major_id, major_id_sz);
2800
2801         /* Server scope */
2802         WRITE32(server_scope_sz);
2803         WRITEMEM(server_scope, server_scope_sz);
2804
2805         /* Implementation id */
2806         WRITE32(0);     /* zero length nfs_impl_id4 array */
2807         ADJUST_ARGS();
2808         return 0;
2809 }
2810
2811 static __be32
2812 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2813                             struct nfsd4_create_session *sess)
2814 {
2815         /* stub */
2816         return nfserr;
2817 }
2818
2819 static __be32
2820 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
2821                              struct nfsd4_destroy_session *destroy_session)
2822 {
2823         /* stub */
2824         return nfserr;
2825 }
2826
2827 static __be32
2828 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
2829                       struct nfsd4_sequence *seq)
2830 {
2831         /* stub */
2832         return nfserr;
2833 }
2834
2835 static __be32
2836 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
2837 {
2838         return nfserr;
2839 }
2840
2841 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
2842
2843 /*
2844  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
2845  * since we don't need to filter out obsolete ops as this is
2846  * done in the decoding phase.
2847  */
2848 static nfsd4_enc nfsd4_enc_ops[] = {
2849         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
2850         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
2851         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
2852         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
2853         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
2854         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
2855         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
2856         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
2857         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
2858         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
2859         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
2860         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
2861         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
2862         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
2863         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
2864         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
2865         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
2866         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
2867         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
2868         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
2869         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
2870         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
2871         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
2872         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
2873         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
2874         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
2875         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
2876         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
2877         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
2878         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
2879         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
2880         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
2881         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
2882         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
2883         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
2884         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
2885         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
2886
2887         /* NFSv4.1 operations */
2888         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
2889         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
2890         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
2891         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
2892         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
2893         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
2894         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
2895         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
2896         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
2897         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
2898         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
2899         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
2900         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
2901         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
2902         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
2903         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
2904         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
2905         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
2906         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
2907 };
2908
2909 void
2910 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2911 {
2912         __be32 *statp;
2913         ENCODE_HEAD;
2914
2915         RESERVE_SPACE(8);
2916         WRITE32(op->opnum);
2917         statp = p++;    /* to be backfilled at the end */
2918         ADJUST_ARGS();
2919
2920         if (op->opnum == OP_ILLEGAL)
2921                 goto status;
2922         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
2923                !nfsd4_enc_ops[op->opnum]);
2924         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
2925 status:
2926         /*
2927          * Note: We write the status directly, instead of using WRITE32(),
2928          * since it is already in network byte order.
2929          */
2930         *statp = op->status;
2931 }
2932
2933 /* 
2934  * Encode the reply stored in the stateowner reply cache 
2935  * 
2936  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2937  * previously sent already encoded operation.
2938  *
2939  * called with nfs4_lock_state() held
2940  */
2941 void
2942 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2943 {
2944         ENCODE_HEAD;
2945         struct nfs4_replay *rp = op->replay;
2946
2947         BUG_ON(!rp);
2948
2949         RESERVE_SPACE(8);
2950         WRITE32(op->opnum);
2951         *p++ = rp->rp_status;  /* already xdr'ed */
2952         ADJUST_ARGS();
2953
2954         RESERVE_SPACE(rp->rp_buflen);
2955         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2956         ADJUST_ARGS();
2957 }
2958
2959 /*
2960  * END OF "GENERIC" ENCODE ROUTINES.
2961  */
2962
2963 int
2964 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2965 {
2966         return xdr_ressize_check(rqstp, p);
2967 }
2968
2969 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2970 {
2971         if (args->ops != args->iops) {
2972                 kfree(args->ops);
2973                 args->ops = args->iops;
2974         }
2975         kfree(args->tmpp);
2976         args->tmpp = NULL;
2977         while (args->to_free) {
2978                 struct tmpbuf *tb = args->to_free;
2979                 args->to_free = tb->next;
2980                 tb->release(tb->buf);
2981                 kfree(tb);
2982         }
2983 }
2984
2985 int
2986 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2987 {
2988         __be32 status;
2989
2990         args->p = p;
2991         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2992         args->pagelist = rqstp->rq_arg.pages;
2993         args->pagelen = rqstp->rq_arg.page_len;
2994         args->tmpp = NULL;
2995         args->to_free = NULL;
2996         args->ops = args->iops;
2997         args->rqstp = rqstp;
2998
2999         status = nfsd4_decode_compound(args);
3000         if (status) {
3001                 nfsd4_release_compoundargs(args);
3002         }
3003         return !status;
3004 }
3005
3006 int
3007 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3008 {
3009         /*
3010          * All that remains is to write the tag and operation count...
3011          */
3012         struct kvec *iov;
3013         p = resp->tagp;
3014         *p++ = htonl(resp->taglen);
3015         memcpy(p, resp->tag, resp->taglen);
3016         p += XDR_QUADLEN(resp->taglen);
3017         *p++ = htonl(resp->opcnt);
3018
3019         if (rqstp->rq_res.page_len) 
3020                 iov = &rqstp->rq_res.tail[0];
3021         else
3022                 iov = &rqstp->rq_res.head[0];
3023         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3024         BUG_ON(iov->iov_len > PAGE_SIZE);
3025         return 1;
3026 }
3027
3028 /*
3029  * Local variables:
3030  *  c-basic-offset: 8
3031  * End:
3032  */