nfsd41: nfsd DRC logic
[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         DECODE_HEAD;
1117
1118         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1119         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1120         READ32(seq->seqid);
1121         READ32(seq->slotid);
1122         READ32(seq->maxslots);
1123         READ32(seq->cachethis);
1124
1125         DECODE_TAIL;
1126 }
1127
1128 static __be32
1129 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1130 {
1131         return nfs_ok;
1132 }
1133
1134 static __be32
1135 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1136 {
1137         return nfserr_notsupp;
1138 }
1139
1140 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1141
1142 static nfsd4_dec nfsd4_dec_ops[] = {
1143         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1144         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1145         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1146         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1147         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1148         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1149         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1150         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1151         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1152         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1153         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1154         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1155         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1156         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1157         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1158         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1159         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1160         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1161         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1162         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1163         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1164         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1165         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1166         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1167         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1168         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1169         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1170         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1171         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1172         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1173         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1174         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1175         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1176         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1177         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1178         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1179         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1180 };
1181
1182 static nfsd4_dec nfsd41_dec_ops[] = {
1183         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1184         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1185         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1186         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1187         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1188         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1189         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1190         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1191         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1192         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1193         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1194         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1195         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1196         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1197         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1198         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1199         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1200         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_notsupp,
1201         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1202         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1203         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1204         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1205         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1206         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1207         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1208         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1209         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1210         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_notsupp,
1211         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1212         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1213         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1214         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1215         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_notsupp,
1216         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
1217         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1218         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1219         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_notsupp,
1220
1221         /* new operations for NFSv4.1 */
1222         [OP_BACKCHANNEL_CTL]    (nfsd4_dec)nfsd4_decode_notsupp,
1223         [OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
1224         [OP_EXCHANGE_ID]        (nfsd4_dec)nfsd4_decode_exchange_id,
1225         [OP_CREATE_SESSION]     (nfsd4_dec)nfsd4_decode_create_session,
1226         [OP_DESTROY_SESSION]    (nfsd4_dec)nfsd4_decode_destroy_session,
1227         [OP_FREE_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1228         [OP_GET_DIR_DELEGATION] (nfsd4_dec)nfsd4_decode_notsupp,
1229         [OP_GETDEVICEINFO]      (nfsd4_dec)nfsd4_decode_notsupp,
1230         [OP_GETDEVICELIST]      (nfsd4_dec)nfsd4_decode_notsupp,
1231         [OP_LAYOUTCOMMIT]       (nfsd4_dec)nfsd4_decode_notsupp,
1232         [OP_LAYOUTGET]          (nfsd4_dec)nfsd4_decode_notsupp,
1233         [OP_LAYOUTRETURN]       (nfsd4_dec)nfsd4_decode_notsupp,
1234         [OP_SECINFO_NO_NAME]    (nfsd4_dec)nfsd4_decode_notsupp,
1235         [OP_SEQUENCE]           (nfsd4_dec)nfsd4_decode_sequence,
1236         [OP_SET_SSV]            (nfsd4_dec)nfsd4_decode_notsupp,
1237         [OP_TEST_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1238         [OP_WANT_DELEGATION]    (nfsd4_dec)nfsd4_decode_notsupp,
1239         [OP_DESTROY_CLIENTID]   (nfsd4_dec)nfsd4_decode_notsupp,
1240         [OP_RECLAIM_COMPLETE]   (nfsd4_dec)nfsd4_decode_notsupp,
1241 };
1242
1243 struct nfsd4_minorversion_ops {
1244         nfsd4_dec *decoders;
1245         int nops;
1246 };
1247
1248 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1249         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1250         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1251 };
1252
1253 static __be32
1254 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1255 {
1256         DECODE_HEAD;
1257         struct nfsd4_op *op;
1258         struct nfsd4_minorversion_ops *ops;
1259         int i;
1260
1261         /*
1262          * XXX: According to spec, we should check the tag
1263          * for UTF-8 compliance.  I'm postponing this for
1264          * now because it seems that some clients do use
1265          * binary tags.
1266          */
1267         READ_BUF(4);
1268         READ32(argp->taglen);
1269         READ_BUF(argp->taglen + 8);
1270         SAVEMEM(argp->tag, argp->taglen);
1271         READ32(argp->minorversion);
1272         READ32(argp->opcnt);
1273
1274         if (argp->taglen > NFSD4_MAX_TAGLEN)
1275                 goto xdr_error;
1276         if (argp->opcnt > 100)
1277                 goto xdr_error;
1278
1279         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1280                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1281                 if (!argp->ops) {
1282                         argp->ops = argp->iops;
1283                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1284                         goto xdr_error;
1285                 }
1286         }
1287
1288         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1289                 argp->opcnt = 0;
1290
1291         ops = &nfsd4_minorversion[argp->minorversion];
1292         for (i = 0; i < argp->opcnt; i++) {
1293                 op = &argp->ops[i];
1294                 op->replay = NULL;
1295
1296                 /*
1297                  * We can't use READ_BUF() here because we need to handle
1298                  * a missing opcode as an OP_WRITE + 1. So we need to check
1299                  * to see if we're truly at the end of our buffer or if there
1300                  * is another page we need to flip to.
1301                  */
1302
1303                 if (argp->p == argp->end) {
1304                         if (argp->pagelen < 4) {
1305                                 /* There isn't an opcode still on the wire */
1306                                 op->opnum = OP_WRITE + 1;
1307                                 op->status = nfserr_bad_xdr;
1308                                 argp->opcnt = i+1;
1309                                 break;
1310                         }
1311
1312                         /*
1313                          * False alarm. We just hit a page boundary, but there
1314                          * is still data available.  Move pointer across page
1315                          * boundary.  *snip from READ_BUF*
1316                          */
1317                         argp->p = page_address(argp->pagelist[0]);
1318                         argp->pagelist++;
1319                         if (argp->pagelen < PAGE_SIZE) {
1320                                 argp->end = p + (argp->pagelen>>2);
1321                                 argp->pagelen = 0;
1322                         } else {
1323                                 argp->end = p + (PAGE_SIZE>>2);
1324                                 argp->pagelen -= PAGE_SIZE;
1325                         }
1326                 }
1327                 op->opnum = ntohl(*argp->p++);
1328
1329                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1330                         op->status = ops->decoders[op->opnum](argp, &op->u);
1331                 else {
1332                         op->opnum = OP_ILLEGAL;
1333                         op->status = nfserr_op_illegal;
1334                 }
1335
1336                 if (op->status) {
1337                         argp->opcnt = i+1;
1338                         break;
1339                 }
1340         }
1341
1342         DECODE_TAIL;
1343 }
1344 /*
1345  * END OF "GENERIC" DECODE ROUTINES.
1346  */
1347
1348 /*
1349  * START OF "GENERIC" ENCODE ROUTINES.
1350  *   These may look a little ugly since they are imported from a "generic"
1351  * set of XDR encode/decode routines which are intended to be shared by
1352  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1353  *
1354  * If the pain of reading these is too great, it should be a straightforward
1355  * task to translate them into Linux-specific versions which are more
1356  * consistent with the style used in NFSv2/v3...
1357  */
1358 #define ENCODE_HEAD              __be32 *p
1359
1360 #define WRITE32(n)               *p++ = htonl(n)
1361 #define WRITE64(n)               do {                           \
1362         *p++ = htonl((u32)((n) >> 32));                         \
1363         *p++ = htonl((u32)(n));                                 \
1364 } while (0)
1365 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1366         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1367         memcpy(p, ptr, nbytes);                                 \
1368         p += XDR_QUADLEN(nbytes);                               \
1369 }} while (0)
1370 #define WRITECINFO(c)           do {                            \
1371         *p++ = htonl(c.atomic);                                 \
1372         *p++ = htonl(c.before_ctime_sec);                               \
1373         *p++ = htonl(c.before_ctime_nsec);                              \
1374         *p++ = htonl(c.after_ctime_sec);                                \
1375         *p++ = htonl(c.after_ctime_nsec);                               \
1376 } while (0)
1377
1378 #define RESERVE_SPACE(nbytes)   do {                            \
1379         p = resp->p;                                            \
1380         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1381 } while (0)
1382 #define ADJUST_ARGS()           resp->p = p
1383
1384 /*
1385  * Header routine to setup seqid operation replay cache
1386  */
1387 #define ENCODE_SEQID_OP_HEAD                                    \
1388         __be32 *save;                                           \
1389                                                                 \
1390         save = resp->p;
1391
1392 /*
1393  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1394  * is where sequence id's are incremented, and the replay cache is filled.
1395  * Note that we increment sequence id's here, at the last moment, so we're sure
1396  * we know whether the error to be returned is a sequence id mutating error.
1397  */
1398
1399 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1400         if (seqid_mutating_err(nfserr) && stateowner) {         \
1401                 stateowner->so_seqid++;                         \
1402                 stateowner->so_replay.rp_status = nfserr;       \
1403                 stateowner->so_replay.rp_buflen =               \
1404                           (((char *)(resp)->p - (char *)save)); \
1405                 memcpy(stateowner->so_replay.rp_buf, save,      \
1406                         stateowner->so_replay.rp_buflen);       \
1407         } } while (0);
1408
1409 /* Encode as an array of strings the string given with components
1410  * seperated @sep.
1411  */
1412 static __be32 nfsd4_encode_components(char sep, char *components,
1413                                    __be32 **pp, int *buflen)
1414 {
1415         __be32 *p = *pp;
1416         __be32 *countp = p;
1417         int strlen, count=0;
1418         char *str, *end;
1419
1420         dprintk("nfsd4_encode_components(%s)\n", components);
1421         if ((*buflen -= 4) < 0)
1422                 return nfserr_resource;
1423         WRITE32(0); /* We will fill this in with @count later */
1424         end = str = components;
1425         while (*end) {
1426                 for (; *end && (*end != sep); end++)
1427                         ; /* Point to end of component */
1428                 strlen = end - str;
1429                 if (strlen) {
1430                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1431                                 return nfserr_resource;
1432                         WRITE32(strlen);
1433                         WRITEMEM(str, strlen);
1434                         count++;
1435                 }
1436                 else
1437                         end++;
1438                 str = end;
1439         }
1440         *pp = p;
1441         p = countp;
1442         WRITE32(count);
1443         return 0;
1444 }
1445
1446 /*
1447  * encode a location element of a fs_locations structure
1448  */
1449 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1450                                     __be32 **pp, int *buflen)
1451 {
1452         __be32 status;
1453         __be32 *p = *pp;
1454
1455         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1456         if (status)
1457                 return status;
1458         status = nfsd4_encode_components('/', location->path, &p, buflen);
1459         if (status)
1460                 return status;
1461         *pp = p;
1462         return 0;
1463 }
1464
1465 /*
1466  * Return the path to an export point in the pseudo filesystem namespace
1467  * Returned string is safe to use as long as the caller holds a reference
1468  * to @exp.
1469  */
1470 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1471 {
1472         struct svc_fh tmp_fh;
1473         char *path, *rootpath;
1474
1475         fh_init(&tmp_fh, NFS4_FHSIZE);
1476         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1477         if (*stat)
1478                 return NULL;
1479         rootpath = tmp_fh.fh_export->ex_pathname;
1480
1481         path = exp->ex_pathname;
1482
1483         if (strncmp(path, rootpath, strlen(rootpath))) {
1484                 dprintk("nfsd: fs_locations failed;"
1485                         "%s is not contained in %s\n", path, rootpath);
1486                 *stat = nfserr_notsupp;
1487                 return NULL;
1488         }
1489
1490         return path + strlen(rootpath);
1491 }
1492
1493 /*
1494  *  encode a fs_locations structure
1495  */
1496 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1497                                      struct svc_export *exp,
1498                                      __be32 **pp, int *buflen)
1499 {
1500         __be32 status;
1501         int i;
1502         __be32 *p = *pp;
1503         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1504         char *root = nfsd4_path(rqstp, exp, &status);
1505
1506         if (status)
1507                 return status;
1508         status = nfsd4_encode_components('/', root, &p, buflen);
1509         if (status)
1510                 return status;
1511         if ((*buflen -= 4) < 0)
1512                 return nfserr_resource;
1513         WRITE32(fslocs->locations_count);
1514         for (i=0; i<fslocs->locations_count; i++) {
1515                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1516                                                    &p, buflen);
1517                 if (status)
1518                         return status;
1519         }
1520         *pp = p;
1521         return 0;
1522 }
1523
1524 static u32 nfs4_ftypes[16] = {
1525         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1526         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1527         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1528         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1529 };
1530
1531 static __be32
1532 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1533                         __be32 **p, int *buflen)
1534 {
1535         int status;
1536
1537         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1538                 return nfserr_resource;
1539         if (whotype != NFS4_ACL_WHO_NAMED)
1540                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1541         else if (group)
1542                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1543         else
1544                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1545         if (status < 0)
1546                 return nfserrno(status);
1547         *p = xdr_encode_opaque(*p, NULL, status);
1548         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1549         BUG_ON(*buflen < 0);
1550         return 0;
1551 }
1552
1553 static inline __be32
1554 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1555 {
1556         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1557 }
1558
1559 static inline __be32
1560 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1561 {
1562         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1563 }
1564
1565 static inline __be32
1566 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1567                 __be32 **p, int *buflen)
1568 {
1569         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1570 }
1571
1572 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1573                               FATTR4_WORD0_RDATTR_ERROR)
1574 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1575
1576 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1577 {
1578         /* As per referral draft:  */
1579         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1580             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1581                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1582                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1583                         *rdattr_err = NFSERR_MOVED;
1584                 else
1585                         return nfserr_moved;
1586         }
1587         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1588         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1589         return 0;
1590 }
1591
1592 /*
1593  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1594  * ourselves.
1595  *
1596  * @countp is the buffer size in _words_; upon successful return this becomes
1597  * replaced with the number of words written.
1598  */
1599 __be32
1600 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1601                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1602                 struct svc_rqst *rqstp, int ignore_crossmnt)
1603 {
1604         u32 bmval0 = bmval[0];
1605         u32 bmval1 = bmval[1];
1606         struct kstat stat;
1607         struct svc_fh tempfh;
1608         struct kstatfs statfs;
1609         int buflen = *countp << 2;
1610         __be32 *attrlenp;
1611         u32 dummy;
1612         u64 dummy64;
1613         u32 rdattr_err = 0;
1614         __be32 *p = buffer;
1615         __be32 status;
1616         int err;
1617         int aclsupport = 0;
1618         struct nfs4_acl *acl = NULL;
1619
1620         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1621         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1622         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1623
1624         if (exp->ex_fslocs.migrated) {
1625                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1626                 if (status)
1627                         goto out;
1628         }
1629
1630         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1631         if (err)
1632                 goto out_nfserr;
1633         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1634                         FATTR4_WORD0_MAXNAME)) ||
1635             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1636                        FATTR4_WORD1_SPACE_TOTAL))) {
1637                 err = vfs_statfs(dentry, &statfs);
1638                 if (err)
1639                         goto out_nfserr;
1640         }
1641         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1642                 fh_init(&tempfh, NFS4_FHSIZE);
1643                 status = fh_compose(&tempfh, exp, dentry, NULL);
1644                 if (status)
1645                         goto out;
1646                 fhp = &tempfh;
1647         }
1648         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1649                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1650                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1651                 aclsupport = (err == 0);
1652                 if (bmval0 & FATTR4_WORD0_ACL) {
1653                         if (err == -EOPNOTSUPP)
1654                                 bmval0 &= ~FATTR4_WORD0_ACL;
1655                         else if (err == -EINVAL) {
1656                                 status = nfserr_attrnotsupp;
1657                                 goto out;
1658                         } else if (err != 0)
1659                                 goto out_nfserr;
1660                 }
1661         }
1662         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1663                 if (exp->ex_fslocs.locations == NULL) {
1664                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1665                 }
1666         }
1667         if ((buflen -= 16) < 0)
1668                 goto out_resource;
1669
1670         WRITE32(2);
1671         WRITE32(bmval0);
1672         WRITE32(bmval1);
1673         attrlenp = p++;                /* to be backfilled later */
1674
1675         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1676                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1677                 if ((buflen -= 12) < 0)
1678                         goto out_resource;
1679                 if (!aclsupport)
1680                         word0 &= ~FATTR4_WORD0_ACL;
1681                 if (!exp->ex_fslocs.locations)
1682                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1683                 WRITE32(2);
1684                 WRITE32(word0);
1685                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1686         }
1687         if (bmval0 & FATTR4_WORD0_TYPE) {
1688                 if ((buflen -= 4) < 0)
1689                         goto out_resource;
1690                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1691                 if (dummy == NF4BAD)
1692                         goto out_serverfault;
1693                 WRITE32(dummy);
1694         }
1695         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1696                 if ((buflen -= 4) < 0)
1697                         goto out_resource;
1698                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1699                         WRITE32(NFS4_FH_PERSISTENT);
1700                 else
1701                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1702         }
1703         if (bmval0 & FATTR4_WORD0_CHANGE) {
1704                 /*
1705                  * Note: This _must_ be consistent with the scheme for writing
1706                  * change_info, so any changes made here must be reflected there
1707                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1708                  * macro above.)
1709                  */
1710                 if ((buflen -= 8) < 0)
1711                         goto out_resource;
1712                 WRITE32(stat.ctime.tv_sec);
1713                 WRITE32(stat.ctime.tv_nsec);
1714         }
1715         if (bmval0 & FATTR4_WORD0_SIZE) {
1716                 if ((buflen -= 8) < 0)
1717                         goto out_resource;
1718                 WRITE64(stat.size);
1719         }
1720         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1721                 if ((buflen -= 4) < 0)
1722                         goto out_resource;
1723                 WRITE32(1);
1724         }
1725         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1726                 if ((buflen -= 4) < 0)
1727                         goto out_resource;
1728                 WRITE32(1);
1729         }
1730         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1731                 if ((buflen -= 4) < 0)
1732                         goto out_resource;
1733                 WRITE32(0);
1734         }
1735         if (bmval0 & FATTR4_WORD0_FSID) {
1736                 if ((buflen -= 16) < 0)
1737                         goto out_resource;
1738                 if (exp->ex_fslocs.migrated) {
1739                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1740                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1741                 } else switch(fsid_source(fhp)) {
1742                 case FSIDSOURCE_FSID:
1743                         WRITE64((u64)exp->ex_fsid);
1744                         WRITE64((u64)0);
1745                         break;
1746                 case FSIDSOURCE_DEV:
1747                         WRITE32(0);
1748                         WRITE32(MAJOR(stat.dev));
1749                         WRITE32(0);
1750                         WRITE32(MINOR(stat.dev));
1751                         break;
1752                 case FSIDSOURCE_UUID:
1753                         WRITEMEM(exp->ex_uuid, 16);
1754                         break;
1755                 }
1756         }
1757         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1758                 if ((buflen -= 4) < 0)
1759                         goto out_resource;
1760                 WRITE32(0);
1761         }
1762         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1763                 if ((buflen -= 4) < 0)
1764                         goto out_resource;
1765                 WRITE32(NFSD_LEASE_TIME);
1766         }
1767         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1768                 if ((buflen -= 4) < 0)
1769                         goto out_resource;
1770                 WRITE32(rdattr_err);
1771         }
1772         if (bmval0 & FATTR4_WORD0_ACL) {
1773                 struct nfs4_ace *ace;
1774
1775                 if (acl == NULL) {
1776                         if ((buflen -= 4) < 0)
1777                                 goto out_resource;
1778
1779                         WRITE32(0);
1780                         goto out_acl;
1781                 }
1782                 if ((buflen -= 4) < 0)
1783                         goto out_resource;
1784                 WRITE32(acl->naces);
1785
1786                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1787                         if ((buflen -= 4*3) < 0)
1788                                 goto out_resource;
1789                         WRITE32(ace->type);
1790                         WRITE32(ace->flag);
1791                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1792                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1793                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1794                                 &p, &buflen);
1795                         if (status == nfserr_resource)
1796                                 goto out_resource;
1797                         if (status)
1798                                 goto out;
1799                 }
1800         }
1801 out_acl:
1802         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1803                 if ((buflen -= 4) < 0)
1804                         goto out_resource;
1805                 WRITE32(aclsupport ?
1806                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1807         }
1808         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1809                 if ((buflen -= 4) < 0)
1810                         goto out_resource;
1811                 WRITE32(1);
1812         }
1813         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1814                 if ((buflen -= 4) < 0)
1815                         goto out_resource;
1816                 WRITE32(1);
1817         }
1818         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1819                 if ((buflen -= 4) < 0)
1820                         goto out_resource;
1821                 WRITE32(1);
1822         }
1823         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1824                 if ((buflen -= 4) < 0)
1825                         goto out_resource;
1826                 WRITE32(1);
1827         }
1828         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1829                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1830                 if (buflen < 0)
1831                         goto out_resource;
1832                 WRITE32(fhp->fh_handle.fh_size);
1833                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1834         }
1835         if (bmval0 & FATTR4_WORD0_FILEID) {
1836                 if ((buflen -= 8) < 0)
1837                         goto out_resource;
1838                 WRITE64(stat.ino);
1839         }
1840         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1841                 if ((buflen -= 8) < 0)
1842                         goto out_resource;
1843                 WRITE64((u64) statfs.f_ffree);
1844         }
1845         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1846                 if ((buflen -= 8) < 0)
1847                         goto out_resource;
1848                 WRITE64((u64) statfs.f_ffree);
1849         }
1850         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1851                 if ((buflen -= 8) < 0)
1852                         goto out_resource;
1853                 WRITE64((u64) statfs.f_files);
1854         }
1855         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1856                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1857                 if (status == nfserr_resource)
1858                         goto out_resource;
1859                 if (status)
1860                         goto out;
1861         }
1862         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1863                 if ((buflen -= 4) < 0)
1864                         goto out_resource;
1865                 WRITE32(1);
1866         }
1867         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1868                 if ((buflen -= 8) < 0)
1869                         goto out_resource;
1870                 WRITE64(~(u64)0);
1871         }
1872         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1873                 if ((buflen -= 4) < 0)
1874                         goto out_resource;
1875                 WRITE32(255);
1876         }
1877         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1878                 if ((buflen -= 4) < 0)
1879                         goto out_resource;
1880                 WRITE32(statfs.f_namelen);
1881         }
1882         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1883                 if ((buflen -= 8) < 0)
1884                         goto out_resource;
1885                 WRITE64((u64) svc_max_payload(rqstp));
1886         }
1887         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1888                 if ((buflen -= 8) < 0)
1889                         goto out_resource;
1890                 WRITE64((u64) svc_max_payload(rqstp));
1891         }
1892         if (bmval1 & FATTR4_WORD1_MODE) {
1893                 if ((buflen -= 4) < 0)
1894                         goto out_resource;
1895                 WRITE32(stat.mode & S_IALLUGO);
1896         }
1897         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1898                 if ((buflen -= 4) < 0)
1899                         goto out_resource;
1900                 WRITE32(1);
1901         }
1902         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1903                 if ((buflen -= 4) < 0)
1904                         goto out_resource;
1905                 WRITE32(stat.nlink);
1906         }
1907         if (bmval1 & FATTR4_WORD1_OWNER) {
1908                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1909                 if (status == nfserr_resource)
1910                         goto out_resource;
1911                 if (status)
1912                         goto out;
1913         }
1914         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1915                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1916                 if (status == nfserr_resource)
1917                         goto out_resource;
1918                 if (status)
1919                         goto out;
1920         }
1921         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1922                 if ((buflen -= 8) < 0)
1923                         goto out_resource;
1924                 WRITE32((u32) MAJOR(stat.rdev));
1925                 WRITE32((u32) MINOR(stat.rdev));
1926         }
1927         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1928                 if ((buflen -= 8) < 0)
1929                         goto out_resource;
1930                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1931                 WRITE64(dummy64);
1932         }
1933         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1934                 if ((buflen -= 8) < 0)
1935                         goto out_resource;
1936                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1937                 WRITE64(dummy64);
1938         }
1939         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1940                 if ((buflen -= 8) < 0)
1941                         goto out_resource;
1942                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1943                 WRITE64(dummy64);
1944         }
1945         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1946                 if ((buflen -= 8) < 0)
1947                         goto out_resource;
1948                 dummy64 = (u64)stat.blocks << 9;
1949                 WRITE64(dummy64);
1950         }
1951         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1952                 if ((buflen -= 12) < 0)
1953                         goto out_resource;
1954                 WRITE32(0);
1955                 WRITE32(stat.atime.tv_sec);
1956                 WRITE32(stat.atime.tv_nsec);
1957         }
1958         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1959                 if ((buflen -= 12) < 0)
1960                         goto out_resource;
1961                 WRITE32(0);
1962                 WRITE32(1);
1963                 WRITE32(0);
1964         }
1965         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1966                 if ((buflen -= 12) < 0)
1967                         goto out_resource;
1968                 WRITE32(0);
1969                 WRITE32(stat.ctime.tv_sec);
1970                 WRITE32(stat.ctime.tv_nsec);
1971         }
1972         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1973                 if ((buflen -= 12) < 0)
1974                         goto out_resource;
1975                 WRITE32(0);
1976                 WRITE32(stat.mtime.tv_sec);
1977                 WRITE32(stat.mtime.tv_nsec);
1978         }
1979         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1980                 if ((buflen -= 8) < 0)
1981                         goto out_resource;
1982                 /*
1983                  * Get parent's attributes if not ignoring crossmount
1984                  * and this is the root of a cross-mounted filesystem.
1985                  */
1986                 if (ignore_crossmnt == 0 &&
1987                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1988                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1989                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
1990                         if (err)
1991                                 goto out_nfserr;
1992                 }
1993                 WRITE64(stat.ino);
1994         }
1995         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1996         *countp = p - buffer;
1997         status = nfs_ok;
1998
1999 out:
2000         kfree(acl);
2001         if (fhp == &tempfh)
2002                 fh_put(&tempfh);
2003         return status;
2004 out_nfserr:
2005         status = nfserrno(err);
2006         goto out;
2007 out_resource:
2008         *countp = 0;
2009         status = nfserr_resource;
2010         goto out;
2011 out_serverfault:
2012         status = nfserr_serverfault;
2013         goto out;
2014 }
2015
2016 static inline int attributes_need_mount(u32 *bmval)
2017 {
2018         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2019                 return 1;
2020         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2021                 return 1;
2022         return 0;
2023 }
2024
2025 static __be32
2026 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2027                 const char *name, int namlen, __be32 *p, int *buflen)
2028 {
2029         struct svc_export *exp = cd->rd_fhp->fh_export;
2030         struct dentry *dentry;
2031         __be32 nfserr;
2032         int ignore_crossmnt = 0;
2033
2034         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2035         if (IS_ERR(dentry))
2036                 return nfserrno(PTR_ERR(dentry));
2037
2038         exp_get(exp);
2039         /*
2040          * In the case of a mountpoint, the client may be asking for
2041          * attributes that are only properties of the underlying filesystem
2042          * as opposed to the cross-mounted file system. In such a case,
2043          * we will not follow the cross mount and will fill the attribtutes
2044          * directly from the mountpoint dentry.
2045          */
2046         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2047                 ignore_crossmnt = 1;
2048         else if (d_mountpoint(dentry)) {
2049                 int err;
2050
2051                 /*
2052                  * Why the heck aren't we just using nfsd_lookup??
2053                  * Different "."/".." handling?  Something else?
2054                  * At least, add a comment here to explain....
2055                  */
2056                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2057                 if (err) {
2058                         nfserr = nfserrno(err);
2059                         goto out_put;
2060                 }
2061                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2062                 if (nfserr)
2063                         goto out_put;
2064
2065         }
2066         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2067                                         cd->rd_rqstp, ignore_crossmnt);
2068 out_put:
2069         dput(dentry);
2070         exp_put(exp);
2071         return nfserr;
2072 }
2073
2074 static __be32 *
2075 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2076 {
2077         __be32 *attrlenp;
2078
2079         if (buflen < 6)
2080                 return NULL;
2081         *p++ = htonl(2);
2082         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2083         *p++ = htonl(0);                         /* bmval1 */
2084
2085         attrlenp = p++;
2086         *p++ = nfserr;       /* no htonl */
2087         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2088         return p;
2089 }
2090
2091 static int
2092 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2093                     loff_t offset, u64 ino, unsigned int d_type)
2094 {
2095         struct readdir_cd *ccd = ccdv;
2096         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2097         int buflen;
2098         __be32 *p = cd->buffer;
2099         __be32 nfserr = nfserr_toosmall;
2100
2101         /* In nfsv4, "." and ".." never make it onto the wire.. */
2102         if (name && isdotent(name, namlen)) {
2103                 cd->common.err = nfs_ok;
2104                 return 0;
2105         }
2106
2107         if (cd->offset)
2108                 xdr_encode_hyper(cd->offset, (u64) offset);
2109
2110         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2111         if (buflen < 0)
2112                 goto fail;
2113
2114         *p++ = xdr_one;                             /* mark entry present */
2115         cd->offset = p;                             /* remember pointer */
2116         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2117         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2118
2119         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2120         switch (nfserr) {
2121         case nfs_ok:
2122                 p += buflen;
2123                 break;
2124         case nfserr_resource:
2125                 nfserr = nfserr_toosmall;
2126                 goto fail;
2127         case nfserr_dropit:
2128                 goto fail;
2129         default:
2130                 /*
2131                  * If the client requested the RDATTR_ERROR attribute,
2132                  * we stuff the error code into this attribute
2133                  * and continue.  If this attribute was not requested,
2134                  * then in accordance with the spec, we fail the
2135                  * entire READDIR operation(!)
2136                  */
2137                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2138                         goto fail;
2139                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2140                 if (p == NULL) {
2141                         nfserr = nfserr_toosmall;
2142                         goto fail;
2143                 }
2144         }
2145         cd->buflen -= (p - cd->buffer);
2146         cd->buffer = p;
2147         cd->common.err = nfs_ok;
2148         return 0;
2149 fail:
2150         cd->common.err = nfserr;
2151         return -EINVAL;
2152 }
2153
2154 static void
2155 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2156 {
2157         ENCODE_HEAD;
2158
2159         RESERVE_SPACE(sizeof(stateid_t));
2160         WRITE32(sid->si_generation);
2161         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2162         ADJUST_ARGS();
2163 }
2164
2165 static __be32
2166 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2167 {
2168         ENCODE_HEAD;
2169
2170         if (!nfserr) {
2171                 RESERVE_SPACE(8);
2172                 WRITE32(access->ac_supported);
2173                 WRITE32(access->ac_resp_access);
2174                 ADJUST_ARGS();
2175         }
2176         return nfserr;
2177 }
2178
2179 static __be32
2180 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2181 {
2182         ENCODE_SEQID_OP_HEAD;
2183
2184         if (!nfserr)
2185                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2186
2187         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2188         return nfserr;
2189 }
2190
2191
2192 static __be32
2193 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2194 {
2195         ENCODE_HEAD;
2196
2197         if (!nfserr) {
2198                 RESERVE_SPACE(8);
2199                 WRITEMEM(commit->co_verf.data, 8);
2200                 ADJUST_ARGS();
2201         }
2202         return nfserr;
2203 }
2204
2205 static __be32
2206 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2207 {
2208         ENCODE_HEAD;
2209
2210         if (!nfserr) {
2211                 RESERVE_SPACE(32);
2212                 WRITECINFO(create->cr_cinfo);
2213                 WRITE32(2);
2214                 WRITE32(create->cr_bmval[0]);
2215                 WRITE32(create->cr_bmval[1]);
2216                 ADJUST_ARGS();
2217         }
2218         return nfserr;
2219 }
2220
2221 static __be32
2222 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2223 {
2224         struct svc_fh *fhp = getattr->ga_fhp;
2225         int buflen;
2226
2227         if (nfserr)
2228                 return nfserr;
2229
2230         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2231         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2232                                     resp->p, &buflen, getattr->ga_bmval,
2233                                     resp->rqstp, 0);
2234         if (!nfserr)
2235                 resp->p += buflen;
2236         return nfserr;
2237 }
2238
2239 static __be32
2240 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2241 {
2242         struct svc_fh *fhp = *fhpp;
2243         unsigned int len;
2244         ENCODE_HEAD;
2245
2246         if (!nfserr) {
2247                 len = fhp->fh_handle.fh_size;
2248                 RESERVE_SPACE(len + 4);
2249                 WRITE32(len);
2250                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2251                 ADJUST_ARGS();
2252         }
2253         return nfserr;
2254 }
2255
2256 /*
2257 * Including all fields other than the name, a LOCK4denied structure requires
2258 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2259 */
2260 static void
2261 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2262 {
2263         ENCODE_HEAD;
2264
2265         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2266         WRITE64(ld->ld_start);
2267         WRITE64(ld->ld_length);
2268         WRITE32(ld->ld_type);
2269         if (ld->ld_sop) {
2270                 WRITEMEM(&ld->ld_clientid, 8);
2271                 WRITE32(ld->ld_sop->so_owner.len);
2272                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2273                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2274         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2275                 WRITE64((u64)0); /* clientid */
2276                 WRITE32(0); /* length of owner name */
2277         }
2278         ADJUST_ARGS();
2279 }
2280
2281 static __be32
2282 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2283 {
2284         ENCODE_SEQID_OP_HEAD;
2285
2286         if (!nfserr)
2287                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2288         else if (nfserr == nfserr_denied)
2289                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2290
2291         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2292         return nfserr;
2293 }
2294
2295 static __be32
2296 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2297 {
2298         if (nfserr == nfserr_denied)
2299                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2300         return nfserr;
2301 }
2302
2303 static __be32
2304 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2305 {
2306         ENCODE_SEQID_OP_HEAD;
2307
2308         if (!nfserr)
2309                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2310
2311         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2312         return nfserr;
2313 }
2314
2315
2316 static __be32
2317 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2318 {
2319         ENCODE_HEAD;
2320
2321         if (!nfserr) {
2322                 RESERVE_SPACE(20);
2323                 WRITECINFO(link->li_cinfo);
2324                 ADJUST_ARGS();
2325         }
2326         return nfserr;
2327 }
2328
2329
2330 static __be32
2331 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2332 {
2333         ENCODE_HEAD;
2334         ENCODE_SEQID_OP_HEAD;
2335
2336         if (nfserr)
2337                 goto out;
2338
2339         nfsd4_encode_stateid(resp, &open->op_stateid);
2340         RESERVE_SPACE(40);
2341         WRITECINFO(open->op_cinfo);
2342         WRITE32(open->op_rflags);
2343         WRITE32(2);
2344         WRITE32(open->op_bmval[0]);
2345         WRITE32(open->op_bmval[1]);
2346         WRITE32(open->op_delegate_type);
2347         ADJUST_ARGS();
2348
2349         switch (open->op_delegate_type) {
2350         case NFS4_OPEN_DELEGATE_NONE:
2351                 break;
2352         case NFS4_OPEN_DELEGATE_READ:
2353                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2354                 RESERVE_SPACE(20);
2355                 WRITE32(open->op_recall);
2356
2357                 /*
2358                  * TODO: ACE's in delegations
2359                  */
2360                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2361                 WRITE32(0);
2362                 WRITE32(0);
2363                 WRITE32(0);   /* XXX: is NULL principal ok? */
2364                 ADJUST_ARGS();
2365                 break;
2366         case NFS4_OPEN_DELEGATE_WRITE:
2367                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2368                 RESERVE_SPACE(32);
2369                 WRITE32(0);
2370
2371                 /*
2372                  * TODO: space_limit's in delegations
2373                  */
2374                 WRITE32(NFS4_LIMIT_SIZE);
2375                 WRITE32(~(u32)0);
2376                 WRITE32(~(u32)0);
2377
2378                 /*
2379                  * TODO: ACE's in delegations
2380                  */
2381                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2382                 WRITE32(0);
2383                 WRITE32(0);
2384                 WRITE32(0);   /* XXX: is NULL principal ok? */
2385                 ADJUST_ARGS();
2386                 break;
2387         default:
2388                 BUG();
2389         }
2390         /* XXX save filehandle here */
2391 out:
2392         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2393         return nfserr;
2394 }
2395
2396 static __be32
2397 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2398 {
2399         ENCODE_SEQID_OP_HEAD;
2400
2401         if (!nfserr)
2402                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2403
2404         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2405         return nfserr;
2406 }
2407
2408 static __be32
2409 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2410 {
2411         ENCODE_SEQID_OP_HEAD;
2412
2413         if (!nfserr)
2414                 nfsd4_encode_stateid(resp, &od->od_stateid);
2415
2416         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2417         return nfserr;
2418 }
2419
2420 static __be32
2421 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2422                   struct nfsd4_read *read)
2423 {
2424         u32 eof;
2425         int v, pn;
2426         unsigned long maxcount; 
2427         long len;
2428         ENCODE_HEAD;
2429
2430         if (nfserr)
2431                 return nfserr;
2432         if (resp->xbuf->page_len)
2433                 return nfserr_resource;
2434
2435         RESERVE_SPACE(8); /* eof flag and byte count */
2436
2437         maxcount = svc_max_payload(resp->rqstp);
2438         if (maxcount > read->rd_length)
2439                 maxcount = read->rd_length;
2440
2441         len = maxcount;
2442         v = 0;
2443         while (len > 0) {
2444                 pn = resp->rqstp->rq_resused++;
2445                 resp->rqstp->rq_vec[v].iov_base =
2446                         page_address(resp->rqstp->rq_respages[pn]);
2447                 resp->rqstp->rq_vec[v].iov_len =
2448                         len < PAGE_SIZE ? len : PAGE_SIZE;
2449                 v++;
2450                 len -= PAGE_SIZE;
2451         }
2452         read->rd_vlen = v;
2453
2454         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2455                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2456                         &maxcount);
2457
2458         if (nfserr == nfserr_symlink)
2459                 nfserr = nfserr_inval;
2460         if (nfserr)
2461                 return nfserr;
2462         eof = (read->rd_offset + maxcount >=
2463                read->rd_fhp->fh_dentry->d_inode->i_size);
2464
2465         WRITE32(eof);
2466         WRITE32(maxcount);
2467         ADJUST_ARGS();
2468         resp->xbuf->head[0].iov_len = (char*)p
2469                                         - (char*)resp->xbuf->head[0].iov_base;
2470         resp->xbuf->page_len = maxcount;
2471
2472         /* Use rest of head for padding and remaining ops: */
2473         resp->xbuf->tail[0].iov_base = p;
2474         resp->xbuf->tail[0].iov_len = 0;
2475         if (maxcount&3) {
2476                 RESERVE_SPACE(4);
2477                 WRITE32(0);
2478                 resp->xbuf->tail[0].iov_base += maxcount&3;
2479                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2480                 ADJUST_ARGS();
2481         }
2482         return 0;
2483 }
2484
2485 static __be32
2486 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2487 {
2488         int maxcount;
2489         char *page;
2490         ENCODE_HEAD;
2491
2492         if (nfserr)
2493                 return nfserr;
2494         if (resp->xbuf->page_len)
2495                 return nfserr_resource;
2496
2497         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2498
2499         maxcount = PAGE_SIZE;
2500         RESERVE_SPACE(4);
2501
2502         /*
2503          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2504          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2505          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2506          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2507          */
2508         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2509         if (nfserr == nfserr_isdir)
2510                 return nfserr_inval;
2511         if (nfserr)
2512                 return nfserr;
2513
2514         WRITE32(maxcount);
2515         ADJUST_ARGS();
2516         resp->xbuf->head[0].iov_len = (char*)p
2517                                 - (char*)resp->xbuf->head[0].iov_base;
2518         resp->xbuf->page_len = maxcount;
2519
2520         /* Use rest of head for padding and remaining ops: */
2521         resp->xbuf->tail[0].iov_base = p;
2522         resp->xbuf->tail[0].iov_len = 0;
2523         if (maxcount&3) {
2524                 RESERVE_SPACE(4);
2525                 WRITE32(0);
2526                 resp->xbuf->tail[0].iov_base += maxcount&3;
2527                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2528                 ADJUST_ARGS();
2529         }
2530         return 0;
2531 }
2532
2533 static __be32
2534 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2535 {
2536         int maxcount;
2537         loff_t offset;
2538         __be32 *page, *savep, *tailbase;
2539         ENCODE_HEAD;
2540
2541         if (nfserr)
2542                 return nfserr;
2543         if (resp->xbuf->page_len)
2544                 return nfserr_resource;
2545
2546         RESERVE_SPACE(8);  /* verifier */
2547         savep = p;
2548
2549         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2550         WRITE32(0);
2551         WRITE32(0);
2552         ADJUST_ARGS();
2553         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2554         tailbase = p;
2555
2556         maxcount = PAGE_SIZE;
2557         if (maxcount > readdir->rd_maxcount)
2558                 maxcount = readdir->rd_maxcount;
2559
2560         /*
2561          * Convert from bytes to words, account for the two words already
2562          * written, make sure to leave two words at the end for the next
2563          * pointer and eof field.
2564          */
2565         maxcount = (maxcount >> 2) - 4;
2566         if (maxcount < 0) {
2567                 nfserr =  nfserr_toosmall;
2568                 goto err_no_verf;
2569         }
2570
2571         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2572         readdir->common.err = 0;
2573         readdir->buflen = maxcount;
2574         readdir->buffer = page;
2575         readdir->offset = NULL;
2576
2577         offset = readdir->rd_cookie;
2578         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2579                               &offset,
2580                               &readdir->common, nfsd4_encode_dirent);
2581         if (nfserr == nfs_ok &&
2582             readdir->common.err == nfserr_toosmall &&
2583             readdir->buffer == page) 
2584                 nfserr = nfserr_toosmall;
2585         if (nfserr == nfserr_symlink)
2586                 nfserr = nfserr_notdir;
2587         if (nfserr)
2588                 goto err_no_verf;
2589
2590         if (readdir->offset)
2591                 xdr_encode_hyper(readdir->offset, offset);
2592
2593         p = readdir->buffer;
2594         *p++ = 0;       /* no more entries */
2595         *p++ = htonl(readdir->common.err == nfserr_eof);
2596         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2597                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2598
2599         /* Use rest of head for padding and remaining ops: */
2600         resp->xbuf->tail[0].iov_base = tailbase;
2601         resp->xbuf->tail[0].iov_len = 0;
2602         resp->p = resp->xbuf->tail[0].iov_base;
2603         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2604
2605         return 0;
2606 err_no_verf:
2607         p = savep;
2608         ADJUST_ARGS();
2609         return nfserr;
2610 }
2611
2612 static __be32
2613 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2614 {
2615         ENCODE_HEAD;
2616
2617         if (!nfserr) {
2618                 RESERVE_SPACE(20);
2619                 WRITECINFO(remove->rm_cinfo);
2620                 ADJUST_ARGS();
2621         }
2622         return nfserr;
2623 }
2624
2625 static __be32
2626 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2627 {
2628         ENCODE_HEAD;
2629
2630         if (!nfserr) {
2631                 RESERVE_SPACE(40);
2632                 WRITECINFO(rename->rn_sinfo);
2633                 WRITECINFO(rename->rn_tinfo);
2634                 ADJUST_ARGS();
2635         }
2636         return nfserr;
2637 }
2638
2639 static __be32
2640 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2641                      struct nfsd4_secinfo *secinfo)
2642 {
2643         int i = 0;
2644         struct svc_export *exp = secinfo->si_exp;
2645         u32 nflavs;
2646         struct exp_flavor_info *flavs;
2647         struct exp_flavor_info def_flavs[2];
2648         ENCODE_HEAD;
2649
2650         if (nfserr)
2651                 goto out;
2652         if (exp->ex_nflavors) {
2653                 flavs = exp->ex_flavors;
2654                 nflavs = exp->ex_nflavors;
2655         } else { /* Handling of some defaults in absence of real secinfo: */
2656                 flavs = def_flavs;
2657                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2658                         nflavs = 2;
2659                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2660                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2661                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2662                         nflavs = 1;
2663                         flavs[0].pseudoflavor
2664                                         = svcauth_gss_flavor(exp->ex_client);
2665                 } else {
2666                         nflavs = 1;
2667                         flavs[0].pseudoflavor
2668                                         = exp->ex_client->flavour->flavour;
2669                 }
2670         }
2671
2672         RESERVE_SPACE(4);
2673         WRITE32(nflavs);
2674         ADJUST_ARGS();
2675         for (i = 0; i < nflavs; i++) {
2676                 u32 flav = flavs[i].pseudoflavor;
2677                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2678
2679                 if (gm) {
2680                         RESERVE_SPACE(4);
2681                         WRITE32(RPC_AUTH_GSS);
2682                         ADJUST_ARGS();
2683                         RESERVE_SPACE(4 + gm->gm_oid.len);
2684                         WRITE32(gm->gm_oid.len);
2685                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2686                         ADJUST_ARGS();
2687                         RESERVE_SPACE(4);
2688                         WRITE32(0); /* qop */
2689                         ADJUST_ARGS();
2690                         RESERVE_SPACE(4);
2691                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2692                         ADJUST_ARGS();
2693                         gss_mech_put(gm);
2694                 } else {
2695                         RESERVE_SPACE(4);
2696                         WRITE32(flav);
2697                         ADJUST_ARGS();
2698                 }
2699         }
2700 out:
2701         if (exp)
2702                 exp_put(exp);
2703         return nfserr;
2704 }
2705
2706 /*
2707  * The SETATTR encode routine is special -- it always encodes a bitmap,
2708  * regardless of the error status.
2709  */
2710 static __be32
2711 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2712 {
2713         ENCODE_HEAD;
2714
2715         RESERVE_SPACE(12);
2716         if (nfserr) {
2717                 WRITE32(2);
2718                 WRITE32(0);
2719                 WRITE32(0);
2720         }
2721         else {
2722                 WRITE32(2);
2723                 WRITE32(setattr->sa_bmval[0]);
2724                 WRITE32(setattr->sa_bmval[1]);
2725         }
2726         ADJUST_ARGS();
2727         return nfserr;
2728 }
2729
2730 static __be32
2731 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2732 {
2733         ENCODE_HEAD;
2734
2735         if (!nfserr) {
2736                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2737                 WRITEMEM(&scd->se_clientid, 8);
2738                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2739                 ADJUST_ARGS();
2740         }
2741         else if (nfserr == nfserr_clid_inuse) {
2742                 RESERVE_SPACE(8);
2743                 WRITE32(0);
2744                 WRITE32(0);
2745                 ADJUST_ARGS();
2746         }
2747         return nfserr;
2748 }
2749
2750 static __be32
2751 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2752 {
2753         ENCODE_HEAD;
2754
2755         if (!nfserr) {
2756                 RESERVE_SPACE(16);
2757                 WRITE32(write->wr_bytes_written);
2758                 WRITE32(write->wr_how_written);
2759                 WRITEMEM(write->wr_verifier.data, 8);
2760                 ADJUST_ARGS();
2761         }
2762         return nfserr;
2763 }
2764
2765 static __be32
2766 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2767                          struct nfsd4_exchange_id *exid)
2768 {
2769         ENCODE_HEAD;
2770         char *major_id;
2771         char *server_scope;
2772         int major_id_sz;
2773         int server_scope_sz;
2774         uint64_t minor_id = 0;
2775
2776         if (nfserr)
2777                 return nfserr;
2778
2779         major_id = utsname()->nodename;
2780         major_id_sz = strlen(major_id);
2781         server_scope = utsname()->nodename;
2782         server_scope_sz = strlen(server_scope);
2783
2784         RESERVE_SPACE(
2785                 8 /* eir_clientid */ +
2786                 4 /* eir_sequenceid */ +
2787                 4 /* eir_flags */ +
2788                 4 /* spr_how (SP4_NONE) */ +
2789                 8 /* so_minor_id */ +
2790                 4 /* so_major_id.len */ +
2791                 (XDR_QUADLEN(major_id_sz) * 4) +
2792                 4 /* eir_server_scope.len */ +
2793                 (XDR_QUADLEN(server_scope_sz) * 4) +
2794                 4 /* eir_server_impl_id.count (0) */);
2795
2796         WRITEMEM(&exid->clientid, 8);
2797         WRITE32(exid->seqid);
2798         WRITE32(exid->flags);
2799
2800         /* state_protect4_r. Currently only support SP4_NONE */
2801         BUG_ON(exid->spa_how != SP4_NONE);
2802         WRITE32(exid->spa_how);
2803
2804         /* The server_owner struct */
2805         WRITE64(minor_id);      /* Minor id */
2806         /* major id */
2807         WRITE32(major_id_sz);
2808         WRITEMEM(major_id, major_id_sz);
2809
2810         /* Server scope */
2811         WRITE32(server_scope_sz);
2812         WRITEMEM(server_scope, server_scope_sz);
2813
2814         /* Implementation id */
2815         WRITE32(0);     /* zero length nfs_impl_id4 array */
2816         ADJUST_ARGS();
2817         return 0;
2818 }
2819
2820 static __be32
2821 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2822                             struct nfsd4_create_session *sess)
2823 {
2824         /* stub */
2825         return nfserr;
2826 }
2827
2828 static __be32
2829 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
2830                              struct nfsd4_destroy_session *destroy_session)
2831 {
2832         /* stub */
2833         return nfserr;
2834 }
2835
2836 static __be32
2837 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
2838                       struct nfsd4_sequence *seq)
2839 {
2840         ENCODE_HEAD;
2841
2842         if (nfserr)
2843                 return nfserr;
2844
2845         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
2846         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2847         WRITE32(seq->seqid);
2848         WRITE32(seq->slotid);
2849         WRITE32(seq->maxslots);
2850         /*
2851          * FIXME: for now:
2852          *   target_maxslots = maxslots
2853          *   status_flags = 0
2854          */
2855         WRITE32(seq->maxslots);
2856         WRITE32(0);
2857
2858         ADJUST_ARGS();
2859         return 0;
2860 }
2861
2862 static __be32
2863 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
2864 {
2865         return nfserr;
2866 }
2867
2868 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
2869
2870 /*
2871  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
2872  * since we don't need to filter out obsolete ops as this is
2873  * done in the decoding phase.
2874  */
2875 static nfsd4_enc nfsd4_enc_ops[] = {
2876         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
2877         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
2878         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
2879         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
2880         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
2881         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
2882         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
2883         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
2884         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
2885         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
2886         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
2887         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
2888         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
2889         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
2890         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
2891         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
2892         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
2893         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
2894         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
2895         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
2896         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
2897         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
2898         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
2899         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
2900         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
2901         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
2902         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
2903         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
2904         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
2905         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
2906         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
2907         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
2908         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
2909         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
2910         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
2911         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
2912         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
2913
2914         /* NFSv4.1 operations */
2915         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
2916         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
2917         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
2918         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
2919         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
2920         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
2921         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
2922         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
2923         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
2924         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
2925         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
2926         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
2927         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
2928         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
2929         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
2930         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
2931         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
2932         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
2933         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
2934 };
2935
2936 void
2937 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2938 {
2939         __be32 *statp;
2940         ENCODE_HEAD;
2941
2942         RESERVE_SPACE(8);
2943         WRITE32(op->opnum);
2944         statp = p++;    /* to be backfilled at the end */
2945         ADJUST_ARGS();
2946
2947         if (op->opnum == OP_ILLEGAL)
2948                 goto status;
2949         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
2950                !nfsd4_enc_ops[op->opnum]);
2951         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
2952 status:
2953         /*
2954          * Note: We write the status directly, instead of using WRITE32(),
2955          * since it is already in network byte order.
2956          */
2957         *statp = op->status;
2958 }
2959
2960 /* 
2961  * Encode the reply stored in the stateowner reply cache 
2962  * 
2963  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2964  * previously sent already encoded operation.
2965  *
2966  * called with nfs4_lock_state() held
2967  */
2968 void
2969 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2970 {
2971         ENCODE_HEAD;
2972         struct nfs4_replay *rp = op->replay;
2973
2974         BUG_ON(!rp);
2975
2976         RESERVE_SPACE(8);
2977         WRITE32(op->opnum);
2978         *p++ = rp->rp_status;  /* already xdr'ed */
2979         ADJUST_ARGS();
2980
2981         RESERVE_SPACE(rp->rp_buflen);
2982         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2983         ADJUST_ARGS();
2984 }
2985
2986 /*
2987  * END OF "GENERIC" ENCODE ROUTINES.
2988  */
2989
2990 int
2991 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2992 {
2993         return xdr_ressize_check(rqstp, p);
2994 }
2995
2996 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2997 {
2998         if (args->ops != args->iops) {
2999                 kfree(args->ops);
3000                 args->ops = args->iops;
3001         }
3002         kfree(args->tmpp);
3003         args->tmpp = NULL;
3004         while (args->to_free) {
3005                 struct tmpbuf *tb = args->to_free;
3006                 args->to_free = tb->next;
3007                 tb->release(tb->buf);
3008                 kfree(tb);
3009         }
3010 }
3011
3012 int
3013 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3014 {
3015         __be32 status;
3016
3017         args->p = p;
3018         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3019         args->pagelist = rqstp->rq_arg.pages;
3020         args->pagelen = rqstp->rq_arg.page_len;
3021         args->tmpp = NULL;
3022         args->to_free = NULL;
3023         args->ops = args->iops;
3024         args->rqstp = rqstp;
3025
3026         status = nfsd4_decode_compound(args);
3027         if (status) {
3028                 nfsd4_release_compoundargs(args);
3029         }
3030         return !status;
3031 }
3032
3033 int
3034 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3035 {
3036         /*
3037          * All that remains is to write the tag and operation count...
3038          */
3039         struct kvec *iov;
3040         p = resp->tagp;
3041         *p++ = htonl(resp->taglen);
3042         memcpy(p, resp->tag, resp->taglen);
3043         p += XDR_QUADLEN(resp->taglen);
3044         *p++ = htonl(resp->opcnt);
3045
3046         if (rqstp->rq_res.page_len) 
3047                 iov = &rqstp->rq_res.tail[0];
3048         else
3049                 iov = &rqstp->rq_res.head[0];
3050         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3051         BUG_ON(iov->iov_len > PAGE_SIZE);
3052         if (resp->cstate.slot != NULL) {
3053                 if (resp->cstate.status == nfserr_replay_cache) {
3054                         iov->iov_len = resp->cstate.iovlen;
3055                 } else {
3056                         nfsd4_store_cache_entry(resp);
3057                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3058                         resp->cstate.slot->sl_inuse = 0;
3059                 }
3060                 if (resp->cstate.session)
3061                         nfsd4_put_session(resp->cstate.session);
3062         }
3063         return 1;
3064 }
3065
3066 /*
3067  * Local variables:
3068  *  c-basic-offset: 8
3069  * End:
3070  */