[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
[linux-2.6.git] / fs / nfsd / nfs4xdr.c
1 /*
2  *  fs/nfs/nfs4xdr.c
3  *
4  *  Server-side XDR for NFSv4
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *  Andy Adamson   <andros@umich.edu>
11  *
12  *  Redistribution and use in source and binary forms, with or without
13  *  modification, are permitted provided that the following conditions
14  *  are met:
15  *
16  *  1. Redistributions of source code must retain the above copyright
17  *     notice, this list of conditions and the following disclaimer.
18  *  2. Redistributions in binary form must reproduce the above copyright
19  *     notice, this list of conditions and the following disclaimer in the
20  *     documentation and/or other materials provided with the distribution.
21  *  3. Neither the name of the University nor the names of its
22  *     contributors may be used to endorse or promote products derived
23  *     from this software without specific prior written permission.
24  *
25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  *
37  * TODO: Neil Brown made the following observation:  We currently
38  * initially reserve NFSD_BUFSIZE space on the transmit queue and
39  * never release any of that until the request is complete.
40  * It would be good to calculate a new maximum response size while
41  * decoding the COMPOUND, and call svc_reserve with this number
42  * at the end of nfs4svc_decode_compoundargs.
43  */
44
45 #include <linux/param.h>
46 #include <linux/smp.h>
47 #include <linux/smp_lock.h>
48 #include <linux/fs.h>
49 #include <linux/namei.h>
50 #include <linux/vfs.h>
51 #include <linux/sunrpc/xdr.h>
52 #include <linux/sunrpc/svc.h>
53 #include <linux/sunrpc/clnt.h>
54 #include <linux/nfsd/nfsd.h>
55 #include <linux/nfsd/state.h>
56 #include <linux/nfsd/xdr4.h>
57 #include <linux/nfsd_idmap.h>
58 #include <linux/nfs4.h>
59 #include <linux/nfs4_acl.h>
60
61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
62
63 static int
64 check_filename(char *str, int len, int err)
65 {
66         int i;
67
68         if (len == 0)
69                 return nfserr_inval;
70         if (isdotent(str, len))
71                 return err;
72         for (i = 0; i < len; i++)
73                 if (str[i] == '/')
74                         return err;
75         return 0;
76 }
77
78 /*
79  * START OF "GENERIC" DECODE ROUTINES.
80  *   These may look a little ugly since they are imported from a "generic"
81  * set of XDR encode/decode routines which are intended to be shared by
82  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
83  *
84  * If the pain of reading these is too great, it should be a straightforward
85  * task to translate them into Linux-specific versions which are more
86  * consistent with the style used in NFSv2/v3...
87  */
88 #define DECODE_HEAD                             \
89         u32 *p;                                 \
90         int status
91 #define DECODE_TAIL                             \
92         status = 0;                             \
93 out:                                            \
94         return status;                          \
95 xdr_error:                                      \
96         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
97         status = nfserr_bad_xdr;                \
98         goto out
99
100 #define READ32(x)         (x) = ntohl(*p++)
101 #define READ64(x)         do {                  \
102         (x) = (u64)ntohl(*p++) << 32;           \
103         (x) |= ntohl(*p++);                     \
104 } while (0)
105 #define READTIME(x)       do {                  \
106         p++;                                    \
107         (x) = ntohl(*p++);                      \
108         p++;                                    \
109 } while (0)
110 #define READMEM(x,nbytes) do {                  \
111         x = (char *)p;                          \
112         p += XDR_QUADLEN(nbytes);               \
113 } while (0)
114 #define SAVEMEM(x,nbytes) do {                  \
115         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
116                 savemem(argp, p, nbytes) :      \
117                 (char *)p)) {                   \
118                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
119                 goto xdr_error;                 \
120                 }                               \
121         p += XDR_QUADLEN(nbytes);               \
122 } while (0)
123 #define COPYMEM(x,nbytes) do {                  \
124         memcpy((x), p, nbytes);                 \
125         p += XDR_QUADLEN(nbytes);               \
126 } while (0)
127
128 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
129 #define READ_BUF(nbytes)  do {                  \
130         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
131                 p = argp->p;                    \
132                 argp->p += XDR_QUADLEN(nbytes); \
133         } else if (!(p = read_buf(argp, nbytes))) { \
134                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
135                 goto xdr_error;                 \
136         }                                       \
137 } while (0)
138
139 static u32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
140 {
141         /* We want more bytes than seem to be available.
142          * Maybe we need a new page, maybe we have just run out
143          */
144         int avail = (char*)argp->end - (char*)argp->p;
145         u32 *p;
146         if (avail + argp->pagelen < nbytes)
147                 return NULL;
148         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
149                 return NULL;
150         /* ok, we can do it with the current plus the next page */
151         if (nbytes <= sizeof(argp->tmp))
152                 p = argp->tmp;
153         else {
154                 kfree(argp->tmpp);
155                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
156                 if (!p)
157                         return NULL;
158                 
159         }
160         memcpy(p, argp->p, avail);
161         /* step to next page */
162         argp->p = page_address(argp->pagelist[0]);
163         argp->pagelist++;
164         if (argp->pagelen < PAGE_SIZE) {
165                 argp->end = p + (argp->pagelen>>2);
166                 argp->pagelen = 0;
167         } else {
168                 argp->end = p + (PAGE_SIZE>>2);
169                 argp->pagelen -= PAGE_SIZE;
170         }
171         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
172         argp->p += XDR_QUADLEN(nbytes - avail);
173         return p;
174 }
175
176 static int
177 defer_free(struct nfsd4_compoundargs *argp,
178                 void (*release)(const void *), void *p)
179 {
180         struct tmpbuf *tb;
181
182         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
183         if (!tb)
184                 return -ENOMEM;
185         tb->buf = p;
186         tb->release = release;
187         tb->next = argp->to_free;
188         argp->to_free = tb;
189         return 0;
190 }
191
192 static char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes)
193 {
194         void *new = NULL;
195         if (p == argp->tmp) {
196                 new = kmalloc(nbytes, GFP_KERNEL);
197                 if (!new) return NULL;
198                 p = new;
199                 memcpy(p, argp->tmp, nbytes);
200         } else {
201                 if (p != argp->tmpp)
202                         BUG();
203                 argp->tmpp = NULL;
204         }
205         if (defer_free(argp, kfree, p)) {
206                 kfree(new);
207                 return NULL;
208         } else
209                 return (char *)p;
210 }
211
212
213 static int
214 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
215 {
216         u32 bmlen;
217         DECODE_HEAD;
218
219         bmval[0] = 0;
220         bmval[1] = 0;
221
222         READ_BUF(4);
223         READ32(bmlen);
224         if (bmlen > 1000)
225                 goto xdr_error;
226
227         READ_BUF(bmlen << 2);
228         if (bmlen > 0)
229                 READ32(bmval[0]);
230         if (bmlen > 1)
231                 READ32(bmval[1]);
232
233         DECODE_TAIL;
234 }
235
236 static int
237 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
238     struct nfs4_acl **acl)
239 {
240         int expected_len, len = 0;
241         u32 dummy32;
242         char *buf;
243
244         DECODE_HEAD;
245         iattr->ia_valid = 0;
246         if ((status = nfsd4_decode_bitmap(argp, bmval)))
247                 return status;
248
249         /*
250          * According to spec, unsupported attributes return ERR_NOTSUPP;
251          * read-only attributes return ERR_INVAL.
252          */
253         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
254                 return nfserr_attrnotsupp;
255         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
256                 return nfserr_inval;
257
258         READ_BUF(4);
259         READ32(expected_len);
260
261         if (bmval[0] & FATTR4_WORD0_SIZE) {
262                 READ_BUF(8);
263                 len += 8;
264                 READ64(iattr->ia_size);
265                 iattr->ia_valid |= ATTR_SIZE;
266         }
267         if (bmval[0] & FATTR4_WORD0_ACL) {
268                 int nace, i;
269                 struct nfs4_ace ace;
270
271                 READ_BUF(4); len += 4;
272                 READ32(nace);
273
274                 *acl = nfs4_acl_new();
275                 if (*acl == NULL) {
276                         status = -ENOMEM;
277                         goto out_nfserr;
278                 }
279                 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
280
281                 for (i = 0; i < nace; i++) {
282                         READ_BUF(16); len += 16;
283                         READ32(ace.type);
284                         READ32(ace.flag);
285                         READ32(ace.access_mask);
286                         READ32(dummy32);
287                         READ_BUF(dummy32);
288                         len += XDR_QUADLEN(dummy32) << 2;
289                         READMEM(buf, dummy32);
290                         ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
291                         status = 0;
292                         if (ace.whotype != NFS4_ACL_WHO_NAMED)
293                                 ace.who = 0;
294                         else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
295                                 status = nfsd_map_name_to_gid(argp->rqstp,
296                                                 buf, dummy32, &ace.who);
297                         else
298                                 status = nfsd_map_name_to_uid(argp->rqstp,
299                                                 buf, dummy32, &ace.who);
300                         if (status)
301                                 goto out_nfserr;
302                         status = nfs4_acl_add_ace(*acl, ace.type, ace.flag,
303                                  ace.access_mask, ace.whotype, ace.who);
304                         if (status)
305                                 goto out_nfserr;
306                 }
307         } else
308                 *acl = NULL;
309         if (bmval[1] & FATTR4_WORD1_MODE) {
310                 READ_BUF(4);
311                 len += 4;
312                 READ32(iattr->ia_mode);
313                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
314                 iattr->ia_valid |= ATTR_MODE;
315         }
316         if (bmval[1] & FATTR4_WORD1_OWNER) {
317                 READ_BUF(4);
318                 len += 4;
319                 READ32(dummy32);
320                 READ_BUF(dummy32);
321                 len += (XDR_QUADLEN(dummy32) << 2);
322                 READMEM(buf, dummy32);
323                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
324                         goto out_nfserr;
325                 iattr->ia_valid |= ATTR_UID;
326         }
327         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
328                 READ_BUF(4);
329                 len += 4;
330                 READ32(dummy32);
331                 READ_BUF(dummy32);
332                 len += (XDR_QUADLEN(dummy32) << 2);
333                 READMEM(buf, dummy32);
334                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
335                         goto out_nfserr;
336                 iattr->ia_valid |= ATTR_GID;
337         }
338         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
339                 READ_BUF(4);
340                 len += 4;
341                 READ32(dummy32);
342                 switch (dummy32) {
343                 case NFS4_SET_TO_CLIENT_TIME:
344                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
345                            all 32 bits of 'nseconds'. */
346                         READ_BUF(12);
347                         len += 12;
348                         READ32(dummy32);
349                         if (dummy32)
350                                 return nfserr_inval;
351                         READ32(iattr->ia_atime.tv_sec);
352                         READ32(iattr->ia_atime.tv_nsec);
353                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
354                                 return nfserr_inval;
355                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
356                         break;
357                 case NFS4_SET_TO_SERVER_TIME:
358                         iattr->ia_valid |= ATTR_ATIME;
359                         break;
360                 default:
361                         goto xdr_error;
362                 }
363         }
364         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
365                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
366                    all 32 bits of 'nseconds'. */
367                 READ_BUF(12);
368                 len += 12;
369                 READ32(dummy32);
370                 if (dummy32)
371                         return nfserr_inval;
372                 READ32(iattr->ia_ctime.tv_sec);
373                 READ32(iattr->ia_ctime.tv_nsec);
374                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
375                         return nfserr_inval;
376                 iattr->ia_valid |= ATTR_CTIME;
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(status);
411         goto out;
412 }
413
414 static int
415 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
416 {
417         DECODE_HEAD;
418
419         READ_BUF(4);
420         READ32(access->ac_req_access);
421
422         DECODE_TAIL;
423 }
424
425 static int
426 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
427 {
428         DECODE_HEAD;
429
430         close->cl_stateowner = NULL;
431         READ_BUF(4 + sizeof(stateid_t));
432         READ32(close->cl_seqid);
433         READ32(close->cl_stateid.si_generation);
434         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
435
436         DECODE_TAIL;
437 }
438
439
440 static int
441 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
442 {
443         DECODE_HEAD;
444
445         READ_BUF(12);
446         READ64(commit->co_offset);
447         READ32(commit->co_count);
448
449         DECODE_TAIL;
450 }
451
452 static int
453 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
454 {
455         DECODE_HEAD;
456
457         READ_BUF(4);
458         READ32(create->cr_type);
459         switch (create->cr_type) {
460         case NF4LNK:
461                 READ_BUF(4);
462                 READ32(create->cr_linklen);
463                 READ_BUF(create->cr_linklen);
464                 SAVEMEM(create->cr_linkname, create->cr_linklen);
465                 break;
466         case NF4BLK:
467         case NF4CHR:
468                 READ_BUF(8);
469                 READ32(create->cr_specdata1);
470                 READ32(create->cr_specdata2);
471                 break;
472         case NF4SOCK:
473         case NF4FIFO:
474         case NF4DIR:
475         default:
476                 break;
477         }
478
479         READ_BUF(4);
480         READ32(create->cr_namelen);
481         READ_BUF(create->cr_namelen);
482         SAVEMEM(create->cr_name, create->cr_namelen);
483         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
484                 return status;
485
486         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
487                 goto out;
488
489         DECODE_TAIL;
490 }
491
492 static inline int
493 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
494 {
495         DECODE_HEAD;
496
497         READ_BUF(sizeof(stateid_t));
498         READ32(dr->dr_stateid.si_generation);
499         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
500
501         DECODE_TAIL;
502 }
503
504 static inline int
505 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
506 {
507         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
508 }
509
510 static int
511 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
512 {
513         DECODE_HEAD;
514
515         READ_BUF(4);
516         READ32(link->li_namelen);
517         READ_BUF(link->li_namelen);
518         SAVEMEM(link->li_name, link->li_namelen);
519         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
520                 return status;
521
522         DECODE_TAIL;
523 }
524
525 static int
526 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
527 {
528         DECODE_HEAD;
529
530         lock->lk_replay_owner = NULL;
531         /*
532         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
533         */
534         READ_BUF(28);
535         READ32(lock->lk_type);
536         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
537                 goto xdr_error;
538         READ32(lock->lk_reclaim);
539         READ64(lock->lk_offset);
540         READ64(lock->lk_length);
541         READ32(lock->lk_is_new);
542
543         if (lock->lk_is_new) {
544                 READ_BUF(36);
545                 READ32(lock->lk_new_open_seqid);
546                 READ32(lock->lk_new_open_stateid.si_generation);
547
548                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
549                 READ32(lock->lk_new_lock_seqid);
550                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
551                 READ32(lock->lk_new_owner.len);
552                 READ_BUF(lock->lk_new_owner.len);
553                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
554         } else {
555                 READ_BUF(20);
556                 READ32(lock->lk_old_lock_stateid.si_generation);
557                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
558                 READ32(lock->lk_old_lock_seqid);
559         }
560
561         DECODE_TAIL;
562 }
563
564 static int
565 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
566 {
567         DECODE_HEAD;
568                         
569         READ_BUF(32);
570         READ32(lockt->lt_type);
571         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
572                 goto xdr_error;
573         READ64(lockt->lt_offset);
574         READ64(lockt->lt_length);
575         COPYMEM(&lockt->lt_clientid, 8);
576         READ32(lockt->lt_owner.len);
577         READ_BUF(lockt->lt_owner.len);
578         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
579
580         DECODE_TAIL;
581 }
582
583 static int
584 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
585 {
586         DECODE_HEAD;
587
588         locku->lu_stateowner = NULL;
589         READ_BUF(24 + sizeof(stateid_t));
590         READ32(locku->lu_type);
591         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
592                 goto xdr_error;
593         READ32(locku->lu_seqid);
594         READ32(locku->lu_stateid.si_generation);
595         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
596         READ64(locku->lu_offset);
597         READ64(locku->lu_length);
598
599         DECODE_TAIL;
600 }
601
602 static int
603 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
604 {
605         DECODE_HEAD;
606
607         READ_BUF(4);
608         READ32(lookup->lo_len);
609         READ_BUF(lookup->lo_len);
610         SAVEMEM(lookup->lo_name, lookup->lo_len);
611         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
612                 return status;
613
614         DECODE_TAIL;
615 }
616
617 static int
618 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
619 {
620         DECODE_HEAD;
621
622         memset(open->op_bmval, 0, sizeof(open->op_bmval));
623         open->op_iattr.ia_valid = 0;
624         open->op_stateowner = NULL;
625
626         /* seqid, share_access, share_deny, clientid, ownerlen */
627         READ_BUF(16 + sizeof(clientid_t));
628         READ32(open->op_seqid);
629         READ32(open->op_share_access);
630         READ32(open->op_share_deny);
631         COPYMEM(&open->op_clientid, sizeof(clientid_t));
632         READ32(open->op_owner.len);
633
634         /* owner, open_flag */
635         READ_BUF(open->op_owner.len + 4);
636         SAVEMEM(open->op_owner.data, open->op_owner.len);
637         READ32(open->op_create);
638         switch (open->op_create) {
639         case NFS4_OPEN_NOCREATE:
640                 break;
641         case NFS4_OPEN_CREATE:
642                 READ_BUF(4);
643                 READ32(open->op_createmode);
644                 switch (open->op_createmode) {
645                 case NFS4_CREATE_UNCHECKED:
646                 case NFS4_CREATE_GUARDED:
647                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
648                                 goto out;
649                         break;
650                 case NFS4_CREATE_EXCLUSIVE:
651                         READ_BUF(8);
652                         COPYMEM(open->op_verf.data, 8);
653                         break;
654                 default:
655                         goto xdr_error;
656                 }
657                 break;
658         default:
659                 goto xdr_error;
660         }
661
662         /* open_claim */
663         READ_BUF(4);
664         READ32(open->op_claim_type);
665         switch (open->op_claim_type) {
666         case NFS4_OPEN_CLAIM_NULL:
667         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
668                 READ_BUF(4);
669                 READ32(open->op_fname.len);
670                 READ_BUF(open->op_fname.len);
671                 SAVEMEM(open->op_fname.data, open->op_fname.len);
672                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
673                         return status;
674                 break;
675         case NFS4_OPEN_CLAIM_PREVIOUS:
676                 READ_BUF(4);
677                 READ32(open->op_delegate_type);
678                 break;
679         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
680                 READ_BUF(sizeof(stateid_t) + 4);
681                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
682                 READ32(open->op_fname.len);
683                 READ_BUF(open->op_fname.len);
684                 SAVEMEM(open->op_fname.data, open->op_fname.len);
685                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
686                         return status;
687                 break;
688         default:
689                 goto xdr_error;
690         }
691
692         DECODE_TAIL;
693 }
694
695 static int
696 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
697 {
698         DECODE_HEAD;
699                     
700         open_conf->oc_stateowner = NULL;
701         READ_BUF(4 + sizeof(stateid_t));
702         READ32(open_conf->oc_req_stateid.si_generation);
703         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
704         READ32(open_conf->oc_seqid);
705                                                         
706         DECODE_TAIL;
707 }
708
709 static int
710 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
711 {
712         DECODE_HEAD;
713                     
714         open_down->od_stateowner = NULL;
715         READ_BUF(12 + sizeof(stateid_t));
716         READ32(open_down->od_stateid.si_generation);
717         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
718         READ32(open_down->od_seqid);
719         READ32(open_down->od_share_access);
720         READ32(open_down->od_share_deny);
721                                                         
722         DECODE_TAIL;
723 }
724
725 static int
726 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
727 {
728         DECODE_HEAD;
729
730         READ_BUF(4);
731         READ32(putfh->pf_fhlen);
732         if (putfh->pf_fhlen > NFS4_FHSIZE)
733                 goto xdr_error;
734         READ_BUF(putfh->pf_fhlen);
735         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
736
737         DECODE_TAIL;
738 }
739
740 static int
741 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
742 {
743         DECODE_HEAD;
744
745         READ_BUF(sizeof(stateid_t) + 12);
746         READ32(read->rd_stateid.si_generation);
747         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
748         READ64(read->rd_offset);
749         READ32(read->rd_length);
750
751         DECODE_TAIL;
752 }
753
754 static int
755 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
756 {
757         DECODE_HEAD;
758
759         READ_BUF(24);
760         READ64(readdir->rd_cookie);
761         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
762         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
763         READ32(readdir->rd_maxcount);
764         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
765                 goto out;
766
767         DECODE_TAIL;
768 }
769
770 static int
771 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
772 {
773         DECODE_HEAD;
774
775         READ_BUF(4);
776         READ32(remove->rm_namelen);
777         READ_BUF(remove->rm_namelen);
778         SAVEMEM(remove->rm_name, remove->rm_namelen);
779         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
780                 return status;
781
782         DECODE_TAIL;
783 }
784
785 static int
786 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
787 {
788         DECODE_HEAD;
789
790         READ_BUF(4);
791         READ32(rename->rn_snamelen);
792         READ_BUF(rename->rn_snamelen + 4);
793         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
794         READ32(rename->rn_tnamelen);
795         READ_BUF(rename->rn_tnamelen);
796         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
797         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
798                 return status;
799         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
800                 return status;
801
802         DECODE_TAIL;
803 }
804
805 static int
806 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
807 {
808         DECODE_HEAD;
809
810         READ_BUF(sizeof(clientid_t));
811         COPYMEM(clientid, sizeof(clientid_t));
812
813         DECODE_TAIL;
814 }
815
816 static int
817 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
818 {
819         DECODE_HEAD;
820
821         READ_BUF(sizeof(stateid_t));
822         READ32(setattr->sa_stateid.si_generation);
823         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
824         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
825                 goto out;
826
827         DECODE_TAIL;
828 }
829
830 static int
831 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
832 {
833         DECODE_HEAD;
834
835         READ_BUF(12);
836         COPYMEM(setclientid->se_verf.data, 8);
837         READ32(setclientid->se_namelen);
838
839         READ_BUF(setclientid->se_namelen + 8);
840         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
841         READ32(setclientid->se_callback_prog);
842         READ32(setclientid->se_callback_netid_len);
843
844         READ_BUF(setclientid->se_callback_netid_len + 4);
845         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
846         READ32(setclientid->se_callback_addr_len);
847
848         READ_BUF(setclientid->se_callback_addr_len + 4);
849         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
850         READ32(setclientid->se_callback_ident);
851
852         DECODE_TAIL;
853 }
854
855 static int
856 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
857 {
858         DECODE_HEAD;
859
860         READ_BUF(8 + sizeof(nfs4_verifier));
861         COPYMEM(&scd_c->sc_clientid, 8);
862         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
863
864         DECODE_TAIL;
865 }
866
867 /* Also used for NVERIFY */
868 static int
869 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
870 {
871 #if 0
872         struct nfsd4_compoundargs save = {
873                 .p = argp->p,
874                 .end = argp->end,
875                 .rqstp = argp->rqstp,
876         };
877         u32             ve_bmval[2];
878         struct iattr    ve_iattr;           /* request */
879         struct nfs4_acl *ve_acl;            /* request */
880 #endif
881         DECODE_HEAD;
882
883         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
884                 goto out;
885
886         /* For convenience's sake, we compare raw xdr'd attributes in
887          * nfsd4_proc_verify; however we still decode here just to return
888          * correct error in case of bad xdr. */
889 #if 0
890         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
891         if (status == nfserr_inval) {
892                 status = nfserrno(status);
893                 goto out;
894         }
895 #endif
896         READ_BUF(4);
897         READ32(verify->ve_attrlen);
898         READ_BUF(verify->ve_attrlen);
899         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
900
901         DECODE_TAIL;
902 }
903
904 static int
905 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
906 {
907         int avail;
908         int v;
909         int len;
910         DECODE_HEAD;
911
912         READ_BUF(sizeof(stateid_opaque_t) + 20);
913         READ32(write->wr_stateid.si_generation);
914         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
915         READ64(write->wr_offset);
916         READ32(write->wr_stable_how);
917         if (write->wr_stable_how > 2)
918                 goto xdr_error;
919         READ32(write->wr_buflen);
920
921         /* Sorry .. no magic macros for this.. *
922          * READ_BUF(write->wr_buflen);
923          * SAVEMEM(write->wr_buf, write->wr_buflen);
924          */
925         avail = (char*)argp->end - (char*)argp->p;
926         if (avail + argp->pagelen < write->wr_buflen) {
927                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); 
928                 goto xdr_error;
929         }
930         write->wr_vec[0].iov_base = p;
931         write->wr_vec[0].iov_len = avail;
932         v = 0;
933         len = write->wr_buflen;
934         while (len > write->wr_vec[v].iov_len) {
935                 len -= write->wr_vec[v].iov_len;
936                 v++;
937                 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]);
938                 argp->pagelist++;
939                 if (argp->pagelen >= PAGE_SIZE) {
940                         write->wr_vec[v].iov_len = PAGE_SIZE;
941                         argp->pagelen -= PAGE_SIZE;
942                 } else {
943                         write->wr_vec[v].iov_len = argp->pagelen;
944                         argp->pagelen -= len;
945                 }
946         }
947         argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len);
948         argp->p = (u32*)  (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
949         write->wr_vec[v].iov_len = len;
950         write->wr_vlen = v+1;
951
952         DECODE_TAIL;
953 }
954
955 static int
956 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
957 {
958         DECODE_HEAD;
959
960         READ_BUF(12);
961         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
962         READ32(rlockowner->rl_owner.len);
963         READ_BUF(rlockowner->rl_owner.len);
964         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
965
966         DECODE_TAIL;
967 }
968
969 static int
970 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
971 {
972         DECODE_HEAD;
973         struct nfsd4_op *op;
974         int i;
975
976         /*
977          * XXX: According to spec, we should check the tag
978          * for UTF-8 compliance.  I'm postponing this for
979          * now because it seems that some clients do use
980          * binary tags.
981          */
982         READ_BUF(4);
983         READ32(argp->taglen);
984         READ_BUF(argp->taglen + 8);
985         SAVEMEM(argp->tag, argp->taglen);
986         READ32(argp->minorversion);
987         READ32(argp->opcnt);
988
989         if (argp->taglen > NFSD4_MAX_TAGLEN)
990                 goto xdr_error;
991         if (argp->opcnt > 100)
992                 goto xdr_error;
993
994         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
995                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
996                 if (!argp->ops) {
997                         argp->ops = argp->iops;
998                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
999                         goto xdr_error;
1000                 }
1001         }
1002
1003         for (i = 0; i < argp->opcnt; i++) {
1004                 op = &argp->ops[i];
1005                 op->replay = NULL;
1006
1007                 /*
1008                  * We can't use READ_BUF() here because we need to handle
1009                  * a missing opcode as an OP_WRITE + 1. So we need to check
1010                  * to see if we're truly at the end of our buffer or if there
1011                  * is another page we need to flip to.
1012                  */
1013
1014                 if (argp->p == argp->end) {
1015                         if (argp->pagelen < 4) {
1016                                 /* There isn't an opcode still on the wire */
1017                                 op->opnum = OP_WRITE + 1;
1018                                 op->status = nfserr_bad_xdr;
1019                                 argp->opcnt = i+1;
1020                                 break;
1021                         }
1022
1023                         /*
1024                          * False alarm. We just hit a page boundary, but there
1025                          * is still data available.  Move pointer across page
1026                          * boundary.  *snip from READ_BUF*
1027                          */
1028                         argp->p = page_address(argp->pagelist[0]);
1029                         argp->pagelist++;
1030                         if (argp->pagelen < PAGE_SIZE) {
1031                                 argp->end = p + (argp->pagelen>>2);
1032                                 argp->pagelen = 0;
1033                         } else {
1034                                 argp->end = p + (PAGE_SIZE>>2);
1035                                 argp->pagelen -= PAGE_SIZE;
1036                         }
1037                 }
1038                 op->opnum = ntohl(*argp->p++);
1039
1040                 switch (op->opnum) {
1041                 case 2: /* Reserved operation */
1042                         op->opnum = OP_ILLEGAL;
1043                         if (argp->minorversion == 0)
1044                                 op->status = nfserr_op_illegal;
1045                         else
1046                                 op->status = nfserr_minor_vers_mismatch;
1047                         break;
1048                 case OP_ACCESS:
1049                         op->status = nfsd4_decode_access(argp, &op->u.access);
1050                         break;
1051                 case OP_CLOSE:
1052                         op->status = nfsd4_decode_close(argp, &op->u.close);
1053                         break;
1054                 case OP_COMMIT:
1055                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1056                         break;
1057                 case OP_CREATE:
1058                         op->status = nfsd4_decode_create(argp, &op->u.create);
1059                         break;
1060                 case OP_DELEGRETURN:
1061                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1062                         break;
1063                 case OP_GETATTR:
1064                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1065                         break;
1066                 case OP_GETFH:
1067                         op->status = nfs_ok;
1068                         break;
1069                 case OP_LINK:
1070                         op->status = nfsd4_decode_link(argp, &op->u.link);
1071                         break;
1072                 case OP_LOCK:
1073                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1074                         break;
1075                 case OP_LOCKT:
1076                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1077                         break;
1078                 case OP_LOCKU:
1079                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1080                         break;
1081                 case OP_LOOKUP:
1082                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1083                         break;
1084                 case OP_LOOKUPP:
1085                         op->status = nfs_ok;
1086                         break;
1087                 case OP_NVERIFY:
1088                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1089                         break;
1090                 case OP_OPEN:
1091                         op->status = nfsd4_decode_open(argp, &op->u.open);
1092                         break;
1093                 case OP_OPEN_CONFIRM:
1094                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1095                         break;
1096                 case OP_OPEN_DOWNGRADE:
1097                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1098                         break;
1099                 case OP_PUTFH:
1100                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1101                         break;
1102                 case OP_PUTROOTFH:
1103                         op->status = nfs_ok;
1104                         break;
1105                 case OP_READ:
1106                         op->status = nfsd4_decode_read(argp, &op->u.read);
1107                         break;
1108                 case OP_READDIR:
1109                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1110                         break;
1111                 case OP_READLINK:
1112                         op->status = nfs_ok;
1113                         break;
1114                 case OP_REMOVE:
1115                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1116                         break;
1117                 case OP_RENAME:
1118                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1119                         break;
1120                 case OP_RESTOREFH:
1121                         op->status = nfs_ok;
1122                         break;
1123                 case OP_RENEW:
1124                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1125                         break;
1126                 case OP_SAVEFH:
1127                         op->status = nfs_ok;
1128                         break;
1129                 case OP_SETATTR:
1130                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1131                         break;
1132                 case OP_SETCLIENTID:
1133                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1134                         break;
1135                 case OP_SETCLIENTID_CONFIRM:
1136                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1137                         break;
1138                 case OP_VERIFY:
1139                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1140                         break;
1141                 case OP_WRITE:
1142                         op->status = nfsd4_decode_write(argp, &op->u.write);
1143                         break;
1144                 case OP_RELEASE_LOCKOWNER:
1145                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1146                         break;
1147                 default:
1148                         op->opnum = OP_ILLEGAL;
1149                         op->status = nfserr_op_illegal;
1150                         break;
1151                 }
1152
1153                 if (op->status) {
1154                         argp->opcnt = i+1;
1155                         break;
1156                 }
1157         }
1158
1159         DECODE_TAIL;
1160 }
1161 /*
1162  * END OF "GENERIC" DECODE ROUTINES.
1163  */
1164
1165 /*
1166  * START OF "GENERIC" ENCODE ROUTINES.
1167  *   These may look a little ugly since they are imported from a "generic"
1168  * set of XDR encode/decode routines which are intended to be shared by
1169  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1170  *
1171  * If the pain of reading these is too great, it should be a straightforward
1172  * task to translate them into Linux-specific versions which are more
1173  * consistent with the style used in NFSv2/v3...
1174  */
1175 #define ENCODE_HEAD              u32 *p
1176
1177 #define WRITE32(n)               *p++ = htonl(n)
1178 #define WRITE64(n)               do {                           \
1179         *p++ = htonl((u32)((n) >> 32));                         \
1180         *p++ = htonl((u32)(n));                                 \
1181 } while (0)
1182 #define WRITEMEM(ptr,nbytes)     do {                           \
1183         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1184         memcpy(p, ptr, nbytes);                                 \
1185         p += XDR_QUADLEN(nbytes);                               \
1186 } while (0)
1187 #define WRITECINFO(c)           do {                            \
1188         *p++ = htonl(c.atomic);                                 \
1189         *p++ = htonl(c.before_ctime_sec);                               \
1190         *p++ = htonl(c.before_ctime_nsec);                              \
1191         *p++ = htonl(c.after_ctime_sec);                                \
1192         *p++ = htonl(c.after_ctime_nsec);                               \
1193 } while (0)
1194
1195 #define RESERVE_SPACE(nbytes)   do {                            \
1196         p = resp->p;                                            \
1197         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1198 } while (0)
1199 #define ADJUST_ARGS()           resp->p = p
1200
1201 /*
1202  * Header routine to setup seqid operation replay cache
1203  */
1204 #define ENCODE_SEQID_OP_HEAD                                    \
1205         u32 *p;                                                 \
1206         u32 *save;                                              \
1207                                                                 \
1208         save = resp->p;
1209
1210 /*
1211  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1212  * is where sequence id's are incremented, and the replay cache is filled.
1213  * Note that we increment sequence id's here, at the last moment, so we're sure
1214  * we know whether the error to be returned is a sequence id mutating error.
1215  */
1216
1217 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1218         if (seqid_mutating_err(nfserr) && stateowner) {         \
1219                 stateowner->so_seqid++;                         \
1220                 stateowner->so_replay.rp_status = nfserr;       \
1221                 stateowner->so_replay.rp_buflen =               \
1222                           (((char *)(resp)->p - (char *)save)); \
1223                 memcpy(stateowner->so_replay.rp_buf, save,      \
1224                         stateowner->so_replay.rp_buflen);       \
1225         } } while (0);
1226
1227
1228 static u32 nfs4_ftypes[16] = {
1229         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1230         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1231         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1232         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1233 };
1234
1235 static int
1236 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1237                         u32 **p, int *buflen)
1238 {
1239         int status;
1240
1241         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1242                 return nfserr_resource;
1243         if (whotype != NFS4_ACL_WHO_NAMED)
1244                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1245         else if (group)
1246                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1247         else
1248                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1249         if (status < 0)
1250                 return nfserrno(status);
1251         *p = xdr_encode_opaque(*p, NULL, status);
1252         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1253         BUG_ON(*buflen < 0);
1254         return 0;
1255 }
1256
1257 static inline int
1258 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
1259 {
1260         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1261 }
1262
1263 static inline int
1264 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
1265 {
1266         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1267 }
1268
1269 static inline int
1270 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1271                 u32 **p, int *buflen)
1272 {
1273         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1274 }
1275
1276
1277 /*
1278  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1279  * ourselves.
1280  *
1281  * @countp is the buffer size in _words_; upon successful return this becomes
1282  * replaced with the number of words written.
1283  */
1284 int
1285 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1286                 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
1287                 struct svc_rqst *rqstp)
1288 {
1289         u32 bmval0 = bmval[0];
1290         u32 bmval1 = bmval[1];
1291         struct kstat stat;
1292         struct svc_fh tempfh;
1293         struct kstatfs statfs;
1294         int buflen = *countp << 2;
1295         u32 *attrlenp;
1296         u32 dummy;
1297         u64 dummy64;
1298         u32 *p = buffer;
1299         int status;
1300         int aclsupport = 0;
1301         struct nfs4_acl *acl = NULL;
1302
1303         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1304         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1305         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1306
1307         status = vfs_getattr(exp->ex_mnt, dentry, &stat);
1308         if (status)
1309                 goto out_nfserr;
1310         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1311             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1312                        FATTR4_WORD1_SPACE_TOTAL))) {
1313                 status = vfs_statfs(dentry, &statfs);
1314                 if (status)
1315                         goto out_nfserr;
1316         }
1317         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1318                 fh_init(&tempfh, NFS4_FHSIZE);
1319                 status = fh_compose(&tempfh, exp, dentry, NULL);
1320                 if (status)
1321                         goto out;
1322                 fhp = &tempfh;
1323         }
1324         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1325                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1326                 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1327                 aclsupport = (status == 0);
1328                 if (bmval0 & FATTR4_WORD0_ACL) {
1329                         if (status == -EOPNOTSUPP)
1330                                 bmval0 &= ~FATTR4_WORD0_ACL;
1331                         else if (status == -EINVAL) {
1332                                 status = nfserr_attrnotsupp;
1333                                 goto out;
1334                         } else if (status != 0)
1335                                 goto out_nfserr;
1336                 }
1337         }
1338         if ((buflen -= 16) < 0)
1339                 goto out_resource;
1340
1341         WRITE32(2);
1342         WRITE32(bmval0);
1343         WRITE32(bmval1);
1344         attrlenp = p++;                /* to be backfilled later */
1345
1346         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1347                 if ((buflen -= 12) < 0)
1348                         goto out_resource;
1349                 WRITE32(2);
1350                 WRITE32(aclsupport ?
1351                         NFSD_SUPPORTED_ATTRS_WORD0 :
1352                         NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
1353                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1354         }
1355         if (bmval0 & FATTR4_WORD0_TYPE) {
1356                 if ((buflen -= 4) < 0)
1357                         goto out_resource;
1358                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1359                 if (dummy == NF4BAD)
1360                         goto out_serverfault;
1361                 WRITE32(dummy);
1362         }
1363         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1364                 if ((buflen -= 4) < 0)
1365                         goto out_resource;
1366                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1367                         WRITE32(NFS4_FH_PERSISTENT);
1368                 else
1369                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1370         }
1371         if (bmval0 & FATTR4_WORD0_CHANGE) {
1372                 /*
1373                  * Note: This _must_ be consistent with the scheme for writing
1374                  * change_info, so any changes made here must be reflected there
1375                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1376                  * macro above.)
1377                  */
1378                 if ((buflen -= 8) < 0)
1379                         goto out_resource;
1380                 WRITE32(stat.ctime.tv_sec);
1381                 WRITE32(stat.ctime.tv_nsec);
1382         }
1383         if (bmval0 & FATTR4_WORD0_SIZE) {
1384                 if ((buflen -= 8) < 0)
1385                         goto out_resource;
1386                 WRITE64(stat.size);
1387         }
1388         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1389                 if ((buflen -= 4) < 0)
1390                         goto out_resource;
1391                 WRITE32(1);
1392         }
1393         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1394                 if ((buflen -= 4) < 0)
1395                         goto out_resource;
1396                 WRITE32(1);
1397         }
1398         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1399                 if ((buflen -= 4) < 0)
1400                         goto out_resource;
1401                 WRITE32(0);
1402         }
1403         if (bmval0 & FATTR4_WORD0_FSID) {
1404                 if ((buflen -= 16) < 0)
1405                         goto out_resource;
1406                 if (is_fsid(fhp, rqstp->rq_reffh)) {
1407                         WRITE64((u64)exp->ex_fsid);
1408                         WRITE64((u64)0);
1409                 } else {
1410                         WRITE32(0);
1411                         WRITE32(MAJOR(stat.dev));
1412                         WRITE32(0);
1413                         WRITE32(MINOR(stat.dev));
1414                 }
1415         }
1416         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1417                 if ((buflen -= 4) < 0)
1418                         goto out_resource;
1419                 WRITE32(0);
1420         }
1421         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1422                 if ((buflen -= 4) < 0)
1423                         goto out_resource;
1424                 WRITE32(NFSD_LEASE_TIME);
1425         }
1426         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1427                 if ((buflen -= 4) < 0)
1428                         goto out_resource;
1429                 WRITE32(0);
1430         }
1431         if (bmval0 & FATTR4_WORD0_ACL) {
1432                 struct nfs4_ace *ace;
1433                 struct list_head *h;
1434
1435                 if (acl == NULL) {
1436                         if ((buflen -= 4) < 0)
1437                                 goto out_resource;
1438
1439                         WRITE32(0);
1440                         goto out_acl;
1441                 }
1442                 if ((buflen -= 4) < 0)
1443                         goto out_resource;
1444                 WRITE32(acl->naces);
1445
1446                 list_for_each(h, &acl->ace_head) {
1447                         ace = list_entry(h, struct nfs4_ace, l_ace);
1448
1449                         if ((buflen -= 4*3) < 0)
1450                                 goto out_resource;
1451                         WRITE32(ace->type);
1452                         WRITE32(ace->flag);
1453                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1454                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1455                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1456                                 &p, &buflen);
1457                         if (status == nfserr_resource)
1458                                 goto out_resource;
1459                         if (status)
1460                                 goto out;
1461                 }
1462         }
1463 out_acl:
1464         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1465                 if ((buflen -= 4) < 0)
1466                         goto out_resource;
1467                 WRITE32(aclsupport ?
1468                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1469         }
1470         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1471                 if ((buflen -= 4) < 0)
1472                         goto out_resource;
1473                 WRITE32(1);
1474         }
1475         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1476                 if ((buflen -= 4) < 0)
1477                         goto out_resource;
1478                 WRITE32(1);
1479         }
1480         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1481                 if ((buflen -= 4) < 0)
1482                         goto out_resource;
1483                 WRITE32(1);
1484         }
1485         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1486                 if ((buflen -= 4) < 0)
1487                         goto out_resource;
1488                 WRITE32(1);
1489         }
1490         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1491                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1492                 if (buflen < 0)
1493                         goto out_resource;
1494                 WRITE32(fhp->fh_handle.fh_size);
1495                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1496         }
1497         if (bmval0 & FATTR4_WORD0_FILEID) {
1498                 if ((buflen -= 8) < 0)
1499                         goto out_resource;
1500                 WRITE64((u64) stat.ino);
1501         }
1502         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1503                 if ((buflen -= 8) < 0)
1504                         goto out_resource;
1505                 WRITE64((u64) statfs.f_ffree);
1506         }
1507         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1508                 if ((buflen -= 8) < 0)
1509                         goto out_resource;
1510                 WRITE64((u64) statfs.f_ffree);
1511         }
1512         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1513                 if ((buflen -= 8) < 0)
1514                         goto out_resource;
1515                 WRITE64((u64) statfs.f_files);
1516         }
1517         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1518                 if ((buflen -= 4) < 0)
1519                         goto out_resource;
1520                 WRITE32(1);
1521         }
1522         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1523                 if ((buflen -= 8) < 0)
1524                         goto out_resource;
1525                 WRITE64(~(u64)0);
1526         }
1527         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1528                 if ((buflen -= 4) < 0)
1529                         goto out_resource;
1530                 WRITE32(255);
1531         }
1532         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1533                 if ((buflen -= 4) < 0)
1534                         goto out_resource;
1535                 WRITE32(~(u32) 0);
1536         }
1537         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1538                 if ((buflen -= 8) < 0)
1539                         goto out_resource;
1540                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1541         }
1542         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1543                 if ((buflen -= 8) < 0)
1544                         goto out_resource;
1545                 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1546         }
1547         if (bmval1 & FATTR4_WORD1_MODE) {
1548                 if ((buflen -= 4) < 0)
1549                         goto out_resource;
1550                 WRITE32(stat.mode & S_IALLUGO);
1551         }
1552         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1553                 if ((buflen -= 4) < 0)
1554                         goto out_resource;
1555                 WRITE32(1);
1556         }
1557         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1558                 if ((buflen -= 4) < 0)
1559                         goto out_resource;
1560                 WRITE32(stat.nlink);
1561         }
1562         if (bmval1 & FATTR4_WORD1_OWNER) {
1563                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1564                 if (status == nfserr_resource)
1565                         goto out_resource;
1566                 if (status)
1567                         goto out;
1568         }
1569         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1570                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1571                 if (status == nfserr_resource)
1572                         goto out_resource;
1573                 if (status)
1574                         goto out;
1575         }
1576         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1577                 if ((buflen -= 8) < 0)
1578                         goto out_resource;
1579                 WRITE32((u32) MAJOR(stat.rdev));
1580                 WRITE32((u32) MINOR(stat.rdev));
1581         }
1582         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1583                 if ((buflen -= 8) < 0)
1584                         goto out_resource;
1585                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1586                 WRITE64(dummy64);
1587         }
1588         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1589                 if ((buflen -= 8) < 0)
1590                         goto out_resource;
1591                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1592                 WRITE64(dummy64);
1593         }
1594         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1595                 if ((buflen -= 8) < 0)
1596                         goto out_resource;
1597                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1598                 WRITE64(dummy64);
1599         }
1600         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1601                 if ((buflen -= 8) < 0)
1602                         goto out_resource;
1603                 dummy64 = (u64)stat.blocks << 9;
1604                 WRITE64(dummy64);
1605         }
1606         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1607                 if ((buflen -= 12) < 0)
1608                         goto out_resource;
1609                 WRITE32(0);
1610                 WRITE32(stat.atime.tv_sec);
1611                 WRITE32(stat.atime.tv_nsec);
1612         }
1613         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1614                 if ((buflen -= 12) < 0)
1615                         goto out_resource;
1616                 WRITE32(0);
1617                 WRITE32(1);
1618                 WRITE32(0);
1619         }
1620         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1621                 if ((buflen -= 12) < 0)
1622                         goto out_resource;
1623                 WRITE32(0);
1624                 WRITE32(stat.ctime.tv_sec);
1625                 WRITE32(stat.ctime.tv_nsec);
1626         }
1627         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1628                 if ((buflen -= 12) < 0)
1629                         goto out_resource;
1630                 WRITE32(0);
1631                 WRITE32(stat.mtime.tv_sec);
1632                 WRITE32(stat.mtime.tv_nsec);
1633         }
1634         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1635                 struct dentry *mnt_pnt, *mnt_root;
1636
1637                 if ((buflen -= 8) < 0)
1638                         goto out_resource;
1639                 mnt_root = exp->ex_mnt->mnt_root;
1640                 if (mnt_root->d_inode == dentry->d_inode) {
1641                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1642                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1643                 } else
1644                         WRITE64((u64) stat.ino);
1645         }
1646         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1647         *countp = p - buffer;
1648         status = nfs_ok;
1649
1650 out:
1651         nfs4_acl_free(acl);
1652         if (fhp == &tempfh)
1653                 fh_put(&tempfh);
1654         return status;
1655 out_nfserr:
1656         status = nfserrno(status);
1657         goto out;
1658 out_resource:
1659         *countp = 0;
1660         status = nfserr_resource;
1661         goto out;
1662 out_serverfault:
1663         status = nfserr_serverfault;
1664         goto out;
1665 }
1666
1667 static int
1668 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1669                 const char *name, int namlen, u32 *p, int *buflen)
1670 {
1671         struct svc_export *exp = cd->rd_fhp->fh_export;
1672         struct dentry *dentry;
1673         int nfserr;
1674
1675         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1676         if (IS_ERR(dentry))
1677                 return nfserrno(PTR_ERR(dentry));
1678
1679         exp_get(exp);
1680         if (d_mountpoint(dentry)) {
1681                 if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) {
1682                 /*
1683                  * -EAGAIN is the only error returned from
1684                  * nfsd_cross_mnt() and it indicates that an
1685                  * up-call has  been initiated to fill in the export
1686                  * options on exp.  When the answer comes back,
1687                  * this call will be retried.
1688                  */
1689                         nfserr = nfserr_dropit;
1690                         goto out_put;
1691                 }
1692
1693         }
1694         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1695                                         cd->rd_rqstp);
1696 out_put:
1697         dput(dentry);
1698         exp_put(exp);
1699         return nfserr;
1700 }
1701
1702 static u32 *
1703 nfsd4_encode_rdattr_error(u32 *p, int buflen, int nfserr)
1704 {
1705         u32 *attrlenp;
1706
1707         if (buflen < 6)
1708                 return NULL;
1709         *p++ = htonl(2);
1710         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1711         *p++ = htonl(0);                         /* bmval1 */
1712
1713         attrlenp = p++;
1714         *p++ = nfserr;       /* no htonl */
1715         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1716         return p;
1717 }
1718
1719 static int
1720 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
1721                     loff_t offset, ino_t ino, unsigned int d_type)
1722 {
1723         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1724         int buflen;
1725         u32 *p = cd->buffer;
1726         int nfserr = nfserr_toosmall;
1727
1728         /* In nfsv4, "." and ".." never make it onto the wire.. */
1729         if (name && isdotent(name, namlen)) {
1730                 cd->common.err = nfs_ok;
1731                 return 0;
1732         }
1733
1734         if (cd->offset)
1735                 xdr_encode_hyper(cd->offset, (u64) offset);
1736
1737         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1738         if (buflen < 0)
1739                 goto fail;
1740
1741         *p++ = xdr_one;                             /* mark entry present */
1742         cd->offset = p;                             /* remember pointer */
1743         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1744         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1745
1746         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1747         switch (nfserr) {
1748         case nfs_ok:
1749                 p += buflen;
1750                 break;
1751         case nfserr_resource:
1752                 nfserr = nfserr_toosmall;
1753                 goto fail;
1754         case nfserr_dropit:
1755                 goto fail;
1756         default:
1757                 /*
1758                  * If the client requested the RDATTR_ERROR attribute,
1759                  * we stuff the error code into this attribute
1760                  * and continue.  If this attribute was not requested,
1761                  * then in accordance with the spec, we fail the
1762                  * entire READDIR operation(!)
1763                  */
1764                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1765                         goto fail;
1766                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1767                 if (p == NULL) {
1768                         nfserr = nfserr_toosmall;
1769                         goto fail;
1770                 }
1771         }
1772         cd->buflen -= (p - cd->buffer);
1773         cd->buffer = p;
1774         cd->common.err = nfs_ok;
1775         return 0;
1776 fail:
1777         cd->common.err = nfserr;
1778         return -EINVAL;
1779 }
1780
1781 static void
1782 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access)
1783 {
1784         ENCODE_HEAD;
1785
1786         if (!nfserr) {
1787                 RESERVE_SPACE(8);
1788                 WRITE32(access->ac_supported);
1789                 WRITE32(access->ac_resp_access);
1790                 ADJUST_ARGS();
1791         }
1792 }
1793
1794 static void
1795 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close)
1796 {
1797         ENCODE_SEQID_OP_HEAD;
1798
1799         if (!nfserr) {
1800                 RESERVE_SPACE(sizeof(stateid_t));
1801                 WRITE32(close->cl_stateid.si_generation);
1802                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1803                 ADJUST_ARGS();
1804         }
1805         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1806 }
1807
1808
1809 static void
1810 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit)
1811 {
1812         ENCODE_HEAD;
1813
1814         if (!nfserr) {
1815                 RESERVE_SPACE(8);
1816                 WRITEMEM(commit->co_verf.data, 8);
1817                 ADJUST_ARGS();
1818         }
1819 }
1820
1821 static void
1822 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create)
1823 {
1824         ENCODE_HEAD;
1825
1826         if (!nfserr) {
1827                 RESERVE_SPACE(32);
1828                 WRITECINFO(create->cr_cinfo);
1829                 WRITE32(2);
1830                 WRITE32(create->cr_bmval[0]);
1831                 WRITE32(create->cr_bmval[1]);
1832                 ADJUST_ARGS();
1833         }
1834 }
1835
1836 static int
1837 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr)
1838 {
1839         struct svc_fh *fhp = getattr->ga_fhp;
1840         int buflen;
1841
1842         if (nfserr)
1843                 return nfserr;
1844
1845         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
1846         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
1847                                     resp->p, &buflen, getattr->ga_bmval,
1848                                     resp->rqstp);
1849
1850         if (!nfserr)
1851                 resp->p += buflen;
1852         return nfserr;
1853 }
1854
1855 static void
1856 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp)
1857 {
1858         unsigned int len;
1859         ENCODE_HEAD;
1860
1861         if (!nfserr) {
1862                 len = fhp->fh_handle.fh_size;
1863                 RESERVE_SPACE(len + 4);
1864                 WRITE32(len);
1865                 WRITEMEM(&fhp->fh_handle.fh_base, len);
1866                 ADJUST_ARGS();
1867         }
1868 }
1869
1870 /*
1871 * Including all fields other than the name, a LOCK4denied structure requires
1872 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
1873 */
1874 static void
1875 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
1876 {
1877         ENCODE_HEAD;
1878
1879         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
1880         WRITE64(ld->ld_start);
1881         WRITE64(ld->ld_length);
1882         WRITE32(ld->ld_type);
1883         if (ld->ld_sop) {
1884                 WRITEMEM(&ld->ld_clientid, 8);
1885                 WRITE32(ld->ld_sop->so_owner.len);
1886                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
1887                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
1888         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
1889                 WRITE64((u64)0); /* clientid */
1890                 WRITE32(0); /* length of owner name */
1891         }
1892         ADJUST_ARGS();
1893 }
1894
1895 static void
1896 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
1897 {
1898         ENCODE_SEQID_OP_HEAD;
1899
1900         if (!nfserr) {
1901                 RESERVE_SPACE(4 + sizeof(stateid_t));
1902                 WRITE32(lock->lk_resp_stateid.si_generation);
1903                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
1904                 ADJUST_ARGS();
1905         } else if (nfserr == nfserr_denied)
1906                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
1907
1908         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
1909 }
1910
1911 static void
1912 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt)
1913 {
1914         if (nfserr == nfserr_denied)
1915                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
1916 }
1917
1918 static void
1919 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku)
1920 {
1921         ENCODE_SEQID_OP_HEAD;
1922
1923         if (!nfserr) {
1924                 RESERVE_SPACE(sizeof(stateid_t));
1925                 WRITE32(locku->lu_stateid.si_generation);
1926                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
1927                 ADJUST_ARGS();
1928         }
1929                                         
1930         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
1931 }
1932
1933
1934 static void
1935 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link)
1936 {
1937         ENCODE_HEAD;
1938
1939         if (!nfserr) {
1940                 RESERVE_SPACE(20);
1941                 WRITECINFO(link->li_cinfo);
1942                 ADJUST_ARGS();
1943         }
1944 }
1945
1946
1947 static void
1948 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open)
1949 {
1950         ENCODE_SEQID_OP_HEAD;
1951
1952         if (nfserr)
1953                 goto out;
1954
1955         RESERVE_SPACE(36 + sizeof(stateid_t));
1956         WRITE32(open->op_stateid.si_generation);
1957         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
1958         WRITECINFO(open->op_cinfo);
1959         WRITE32(open->op_rflags);
1960         WRITE32(2);
1961         WRITE32(open->op_bmval[0]);
1962         WRITE32(open->op_bmval[1]);
1963         WRITE32(open->op_delegate_type);
1964         ADJUST_ARGS();
1965
1966         switch (open->op_delegate_type) {
1967         case NFS4_OPEN_DELEGATE_NONE:
1968                 break;
1969         case NFS4_OPEN_DELEGATE_READ:
1970                 RESERVE_SPACE(20 + sizeof(stateid_t));
1971                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
1972                 WRITE32(open->op_recall);
1973
1974                 /*
1975                  * TODO: ACE's in delegations
1976                  */
1977                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
1978                 WRITE32(0);
1979                 WRITE32(0);
1980                 WRITE32(0);   /* XXX: is NULL principal ok? */
1981                 ADJUST_ARGS();
1982                 break;
1983         case NFS4_OPEN_DELEGATE_WRITE:
1984                 RESERVE_SPACE(32 + sizeof(stateid_t));
1985                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
1986                 WRITE32(0);
1987
1988                 /*
1989                  * TODO: space_limit's in delegations
1990                  */
1991                 WRITE32(NFS4_LIMIT_SIZE);
1992                 WRITE32(~(u32)0);
1993                 WRITE32(~(u32)0);
1994
1995                 /*
1996                  * TODO: ACE's in delegations
1997                  */
1998                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
1999                 WRITE32(0);
2000                 WRITE32(0);
2001                 WRITE32(0);   /* XXX: is NULL principal ok? */
2002                 ADJUST_ARGS();
2003                 break;
2004         default:
2005                 BUG();
2006         }
2007         /* XXX save filehandle here */
2008 out:
2009         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2010 }
2011
2012 static void
2013 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc)
2014 {
2015         ENCODE_SEQID_OP_HEAD;
2016                                         
2017         if (!nfserr) {
2018                 RESERVE_SPACE(sizeof(stateid_t));
2019                 WRITE32(oc->oc_resp_stateid.si_generation);
2020                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2021                 ADJUST_ARGS();
2022         }
2023
2024         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2025 }
2026
2027 static void
2028 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od)
2029 {
2030         ENCODE_SEQID_OP_HEAD;
2031                                         
2032         if (!nfserr) {
2033                 RESERVE_SPACE(sizeof(stateid_t));
2034                 WRITE32(od->od_stateid.si_generation);
2035                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2036                 ADJUST_ARGS();
2037         }
2038
2039         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2040 }
2041
2042 static int
2043 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read)
2044 {
2045         u32 eof;
2046         int v, pn;
2047         unsigned long maxcount; 
2048         long len;
2049         ENCODE_HEAD;
2050
2051         if (nfserr)
2052                 return nfserr;
2053         if (resp->xbuf->page_len)
2054                 return nfserr_resource;
2055
2056         RESERVE_SPACE(8); /* eof flag and byte count */
2057
2058         maxcount = NFSSVC_MAXBLKSIZE;
2059         if (maxcount > read->rd_length)
2060                 maxcount = read->rd_length;
2061
2062         len = maxcount;
2063         v = 0;
2064         while (len > 0) {
2065                 pn = resp->rqstp->rq_resused;
2066                 svc_take_page(resp->rqstp);
2067                 read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]);
2068                 read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE;
2069                 v++;
2070                 len -= PAGE_SIZE;
2071         }
2072         read->rd_vlen = v;
2073
2074         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2075                         read->rd_offset, read->rd_iov, read->rd_vlen,
2076                         &maxcount);
2077
2078         if (nfserr == nfserr_symlink)
2079                 nfserr = nfserr_inval;
2080         if (nfserr)
2081                 return nfserr;
2082         eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size);
2083
2084         WRITE32(eof);
2085         WRITE32(maxcount);
2086         ADJUST_ARGS();
2087         resp->xbuf->head[0].iov_len = (char*)p
2088                                         - (char*)resp->xbuf->head[0].iov_base;
2089         resp->xbuf->page_len = maxcount;
2090
2091         /* Use rest of head for padding and remaining ops: */
2092         resp->rqstp->rq_restailpage = 0;
2093         resp->xbuf->tail[0].iov_base = p;
2094         resp->xbuf->tail[0].iov_len = 0;
2095         if (maxcount&3) {
2096                 RESERVE_SPACE(4);
2097                 WRITE32(0);
2098                 resp->xbuf->tail[0].iov_base += maxcount&3;
2099                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2100                 ADJUST_ARGS();
2101         }
2102         return 0;
2103 }
2104
2105 static int
2106 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
2107 {
2108         int maxcount;
2109         char *page;
2110         ENCODE_HEAD;
2111
2112         if (nfserr)
2113                 return nfserr;
2114         if (resp->xbuf->page_len)
2115                 return nfserr_resource;
2116
2117         svc_take_page(resp->rqstp);
2118         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2119
2120         maxcount = PAGE_SIZE;
2121         RESERVE_SPACE(4);
2122
2123         /*
2124          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2125          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2126          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2127          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2128          */
2129         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2130         if (nfserr == nfserr_isdir)
2131                 return nfserr_inval;
2132         if (nfserr)
2133                 return nfserr;
2134
2135         WRITE32(maxcount);
2136         ADJUST_ARGS();
2137         resp->xbuf->head[0].iov_len = (char*)p
2138                                 - (char*)resp->xbuf->head[0].iov_base;
2139         resp->xbuf->page_len = maxcount;
2140
2141         /* Use rest of head for padding and remaining ops: */
2142         resp->rqstp->rq_restailpage = 0;
2143         resp->xbuf->tail[0].iov_base = p;
2144         resp->xbuf->tail[0].iov_len = 0;
2145         if (maxcount&3) {
2146                 RESERVE_SPACE(4);
2147                 WRITE32(0);
2148                 resp->xbuf->tail[0].iov_base += maxcount&3;
2149                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2150                 ADJUST_ARGS();
2151         }
2152         return 0;
2153 }
2154
2155 static int
2156 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
2157 {
2158         int maxcount;
2159         loff_t offset;
2160         u32 *page, *savep, *tailbase;
2161         ENCODE_HEAD;
2162
2163         if (nfserr)
2164                 return nfserr;
2165         if (resp->xbuf->page_len)
2166                 return nfserr_resource;
2167
2168         RESERVE_SPACE(8);  /* verifier */
2169         savep = p;
2170
2171         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2172         WRITE32(0);
2173         WRITE32(0);
2174         ADJUST_ARGS();
2175         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2176         tailbase = p;
2177
2178         maxcount = PAGE_SIZE;
2179         if (maxcount > readdir->rd_maxcount)
2180                 maxcount = readdir->rd_maxcount;
2181
2182         /*
2183          * Convert from bytes to words, account for the two words already
2184          * written, make sure to leave two words at the end for the next
2185          * pointer and eof field.
2186          */
2187         maxcount = (maxcount >> 2) - 4;
2188         if (maxcount < 0) {
2189                 nfserr =  nfserr_toosmall;
2190                 goto err_no_verf;
2191         }
2192
2193         svc_take_page(resp->rqstp);
2194         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2195         readdir->common.err = 0;
2196         readdir->buflen = maxcount;
2197         readdir->buffer = page;
2198         readdir->offset = NULL;
2199
2200         offset = readdir->rd_cookie;
2201         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2202                               &offset,
2203                               &readdir->common, nfsd4_encode_dirent);
2204         if (nfserr == nfs_ok &&
2205             readdir->common.err == nfserr_toosmall &&
2206             readdir->buffer == page) 
2207                 nfserr = nfserr_toosmall;
2208         if (nfserr == nfserr_symlink)
2209                 nfserr = nfserr_notdir;
2210         if (nfserr)
2211                 goto err_no_verf;
2212
2213         if (readdir->offset)
2214                 xdr_encode_hyper(readdir->offset, offset);
2215
2216         p = readdir->buffer;
2217         *p++ = 0;       /* no more entries */
2218         *p++ = htonl(readdir->common.err == nfserr_eof);
2219         resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2220
2221         /* Use rest of head for padding and remaining ops: */
2222         resp->rqstp->rq_restailpage = 0;
2223         resp->xbuf->tail[0].iov_base = tailbase;
2224         resp->xbuf->tail[0].iov_len = 0;
2225         resp->p = resp->xbuf->tail[0].iov_base;
2226         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2227
2228         return 0;
2229 err_no_verf:
2230         p = savep;
2231         ADJUST_ARGS();
2232         return nfserr;
2233 }
2234
2235 static void
2236 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
2237 {
2238         ENCODE_HEAD;
2239
2240         if (!nfserr) {
2241                 RESERVE_SPACE(20);
2242                 WRITECINFO(remove->rm_cinfo);
2243                 ADJUST_ARGS();
2244         }
2245 }
2246
2247 static void
2248 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
2249 {
2250         ENCODE_HEAD;
2251
2252         if (!nfserr) {
2253                 RESERVE_SPACE(40);
2254                 WRITECINFO(rename->rn_sinfo);
2255                 WRITECINFO(rename->rn_tinfo);
2256                 ADJUST_ARGS();
2257         }
2258 }
2259
2260 /*
2261  * The SETATTR encode routine is special -- it always encodes a bitmap,
2262  * regardless of the error status.
2263  */
2264 static void
2265 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
2266 {
2267         ENCODE_HEAD;
2268
2269         RESERVE_SPACE(12);
2270         if (nfserr) {
2271                 WRITE32(2);
2272                 WRITE32(0);
2273                 WRITE32(0);
2274         }
2275         else {
2276                 WRITE32(2);
2277                 WRITE32(setattr->sa_bmval[0]);
2278                 WRITE32(setattr->sa_bmval[1]);
2279         }
2280         ADJUST_ARGS();
2281 }
2282
2283 static void
2284 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
2285 {
2286         ENCODE_HEAD;
2287
2288         if (!nfserr) {
2289                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2290                 WRITEMEM(&scd->se_clientid, 8);
2291                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2292                 ADJUST_ARGS();
2293         }
2294         else if (nfserr == nfserr_clid_inuse) {
2295                 RESERVE_SPACE(8);
2296                 WRITE32(0);
2297                 WRITE32(0);
2298                 ADJUST_ARGS();
2299         }
2300 }
2301
2302 static void
2303 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
2304 {
2305         ENCODE_HEAD;
2306
2307         if (!nfserr) {
2308                 RESERVE_SPACE(16);
2309                 WRITE32(write->wr_bytes_written);
2310                 WRITE32(write->wr_how_written);
2311                 WRITEMEM(write->wr_verifier.data, 8);
2312                 ADJUST_ARGS();
2313         }
2314 }
2315
2316 void
2317 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2318 {
2319         u32 *statp;
2320         ENCODE_HEAD;
2321
2322         RESERVE_SPACE(8);
2323         WRITE32(op->opnum);
2324         statp = p++;    /* to be backfilled at the end */
2325         ADJUST_ARGS();
2326
2327         switch (op->opnum) {
2328         case OP_ACCESS:
2329                 nfsd4_encode_access(resp, op->status, &op->u.access);
2330                 break;
2331         case OP_CLOSE:
2332                 nfsd4_encode_close(resp, op->status, &op->u.close);
2333                 break;
2334         case OP_COMMIT:
2335                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2336                 break;
2337         case OP_CREATE:
2338                 nfsd4_encode_create(resp, op->status, &op->u.create);
2339                 break;
2340         case OP_DELEGRETURN:
2341                 break;
2342         case OP_GETATTR:
2343                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2344                 break;
2345         case OP_GETFH:
2346                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2347                 break;
2348         case OP_LINK:
2349                 nfsd4_encode_link(resp, op->status, &op->u.link);
2350                 break;
2351         case OP_LOCK:
2352                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2353                 break;
2354         case OP_LOCKT:
2355                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2356                 break;
2357         case OP_LOCKU:
2358                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2359                 break;
2360         case OP_LOOKUP:
2361                 break;
2362         case OP_LOOKUPP:
2363                 break;
2364         case OP_NVERIFY:
2365                 break;
2366         case OP_OPEN:
2367                 nfsd4_encode_open(resp, op->status, &op->u.open);
2368                 break;
2369         case OP_OPEN_CONFIRM:
2370                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2371                 break;
2372         case OP_OPEN_DOWNGRADE:
2373                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2374                 break;
2375         case OP_PUTFH:
2376                 break;
2377         case OP_PUTROOTFH:
2378                 break;
2379         case OP_READ:
2380                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2381                 break;
2382         case OP_READDIR:
2383                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2384                 break;
2385         case OP_READLINK:
2386                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2387                 break;
2388         case OP_REMOVE:
2389                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2390                 break;
2391         case OP_RENAME:
2392                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2393                 break;
2394         case OP_RENEW:
2395                 break;
2396         case OP_RESTOREFH:
2397                 break;
2398         case OP_SAVEFH:
2399                 break;
2400         case OP_SETATTR:
2401                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2402                 break;
2403         case OP_SETCLIENTID:
2404                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2405                 break;
2406         case OP_SETCLIENTID_CONFIRM:
2407                 break;
2408         case OP_VERIFY:
2409                 break;
2410         case OP_WRITE:
2411                 nfsd4_encode_write(resp, op->status, &op->u.write);
2412                 break;
2413         case OP_RELEASE_LOCKOWNER:
2414                 break;
2415         default:
2416                 break;
2417         }
2418
2419         /*
2420          * Note: We write the status directly, instead of using WRITE32(),
2421          * since it is already in network byte order.
2422          */
2423         *statp = op->status;
2424 }
2425
2426 /* 
2427  * Encode the reply stored in the stateowner reply cache 
2428  * 
2429  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2430  * previously sent already encoded operation.
2431  *
2432  * called with nfs4_lock_state() held
2433  */
2434 void
2435 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2436 {
2437         ENCODE_HEAD;
2438         struct nfs4_replay *rp = op->replay;
2439
2440         BUG_ON(!rp);
2441
2442         RESERVE_SPACE(8);
2443         WRITE32(op->opnum);
2444         *p++ = rp->rp_status;  /* already xdr'ed */
2445         ADJUST_ARGS();
2446
2447         RESERVE_SPACE(rp->rp_buflen);
2448         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2449         ADJUST_ARGS();
2450 }
2451
2452 /*
2453  * END OF "GENERIC" ENCODE ROUTINES.
2454  */
2455
2456 int
2457 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
2458 {
2459         return xdr_ressize_check(rqstp, p);
2460 }
2461
2462 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2463 {
2464         if (args->ops != args->iops) {
2465                 kfree(args->ops);
2466                 args->ops = args->iops;
2467         }
2468         kfree(args->tmpp);
2469         args->tmpp = NULL;
2470         while (args->to_free) {
2471                 struct tmpbuf *tb = args->to_free;
2472                 args->to_free = tb->next;
2473                 tb->release(tb->buf);
2474                 kfree(tb);
2475         }
2476 }
2477
2478 int
2479 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
2480 {
2481         int status;
2482
2483         args->p = p;
2484         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2485         args->pagelist = rqstp->rq_arg.pages;
2486         args->pagelen = rqstp->rq_arg.page_len;
2487         args->tmpp = NULL;
2488         args->to_free = NULL;
2489         args->ops = args->iops;
2490         args->rqstp = rqstp;
2491
2492         status = nfsd4_decode_compound(args);
2493         if (status) {
2494                 nfsd4_release_compoundargs(args);
2495         }
2496         return !status;
2497 }
2498
2499 int
2500 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
2501 {
2502         /*
2503          * All that remains is to write the tag and operation count...
2504          */
2505         struct kvec *iov;
2506         p = resp->tagp;
2507         *p++ = htonl(resp->taglen);
2508         memcpy(p, resp->tag, resp->taglen);
2509         p += XDR_QUADLEN(resp->taglen);
2510         *p++ = htonl(resp->opcnt);
2511
2512         if (rqstp->rq_res.page_len) 
2513                 iov = &rqstp->rq_res.tail[0];
2514         else
2515                 iov = &rqstp->rq_res.head[0];
2516         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2517         BUG_ON(iov->iov_len > PAGE_SIZE);
2518         return 1;
2519 }
2520
2521 /*
2522  * Local variables:
2523  *  c-basic-offset: 8
2524  * End:
2525  */