Linux-2.6.12-rc2
[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 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                 if (argp->tmpp)
155                         kfree(argp->tmpp);
156                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
157                 if (!p)
158                         return NULL;
159                 
160         }
161         memcpy(p, argp->p, avail);
162         /* step to next page */
163         argp->p = page_address(argp->pagelist[0]);
164         argp->pagelist++;
165         if (argp->pagelen < PAGE_SIZE) {
166                 argp->end = p + (argp->pagelen>>2);
167                 argp->pagelen = 0;
168         } else {
169                 argp->end = p + (PAGE_SIZE>>2);
170                 argp->pagelen -= PAGE_SIZE;
171         }
172         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
173         argp->p += XDR_QUADLEN(nbytes - avail);
174         return p;
175 }
176
177 static int
178 defer_free(struct nfsd4_compoundargs *argp,
179                 void (*release)(const void *), void *p)
180 {
181         struct tmpbuf *tb;
182
183         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
184         if (!tb)
185                 return -ENOMEM;
186         tb->buf = p;
187         tb->release = release;
188         tb->next = argp->to_free;
189         argp->to_free = tb;
190         return 0;
191 }
192
193 char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes)
194 {
195         void *new = NULL;
196         if (p == argp->tmp) {
197                 new = kmalloc(nbytes, GFP_KERNEL);
198                 if (!new) return NULL;
199                 p = new;
200                 memcpy(p, argp->tmp, nbytes);
201         } else {
202                 if (p != argp->tmpp)
203                         BUG();
204                 argp->tmpp = NULL;
205         }
206         if (defer_free(argp, kfree, p)) {
207                 kfree(new);
208                 return NULL;
209         } else
210                 return (char *)p;
211 }
212
213
214 static int
215 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
216 {
217         u32 bmlen;
218         DECODE_HEAD;
219
220         bmval[0] = 0;
221         bmval[1] = 0;
222
223         READ_BUF(4);
224         READ32(bmlen);
225         if (bmlen > 1000)
226                 goto xdr_error;
227
228         READ_BUF(bmlen << 2);
229         if (bmlen > 0)
230                 READ32(bmval[0]);
231         if (bmlen > 1)
232                 READ32(bmval[1]);
233
234         DECODE_TAIL;
235 }
236
237 static int
238 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
239     struct nfs4_acl **acl)
240 {
241         int expected_len, len = 0;
242         u32 dummy32;
243         char *buf;
244
245         DECODE_HEAD;
246         iattr->ia_valid = 0;
247         if ((status = nfsd4_decode_bitmap(argp, bmval)))
248                 return status;
249
250         /*
251          * According to spec, unsupported attributes return ERR_NOTSUPP;
252          * read-only attributes return ERR_INVAL.
253          */
254         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
255                 return nfserr_attrnotsupp;
256         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
257                 return nfserr_inval;
258
259         READ_BUF(4);
260         READ32(expected_len);
261
262         if (bmval[0] & FATTR4_WORD0_SIZE) {
263                 READ_BUF(8);
264                 len += 8;
265                 READ64(iattr->ia_size);
266                 iattr->ia_valid |= ATTR_SIZE;
267         }
268         if (bmval[0] & FATTR4_WORD0_ACL) {
269                 int nace, i;
270                 struct nfs4_ace ace;
271
272                 READ_BUF(4); len += 4;
273                 READ32(nace);
274
275                 *acl = nfs4_acl_new();
276                 if (*acl == NULL) {
277                         status = -ENOMEM;
278                         goto out_nfserr;
279                 }
280                 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
281
282                 for (i = 0; i < nace; i++) {
283                         READ_BUF(16); len += 16;
284                         READ32(ace.type);
285                         READ32(ace.flag);
286                         READ32(ace.access_mask);
287                         READ32(dummy32);
288                         READ_BUF(dummy32);
289                         len += XDR_QUADLEN(dummy32) << 2;
290                         READMEM(buf, dummy32);
291                         ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
292                         status = 0;
293                         if (ace.whotype != NFS4_ACL_WHO_NAMED)
294                                 ace.who = 0;
295                         else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
296                                 status = nfsd_map_name_to_gid(argp->rqstp,
297                                                 buf, dummy32, &ace.who);
298                         else
299                                 status = nfsd_map_name_to_uid(argp->rqstp,
300                                                 buf, dummy32, &ace.who);
301                         if (status)
302                                 goto out_nfserr;
303                         if (nfs4_acl_add_ace(*acl, ace.type, ace.flag,
304                                  ace.access_mask, ace.whotype, ace.who) != 0) {
305                                 status = -ENOMEM;
306                                 goto out_nfserr;
307                         }
308                 }
309         } else
310                 *acl = NULL;
311         if (bmval[1] & FATTR4_WORD1_MODE) {
312                 READ_BUF(4);
313                 len += 4;
314                 READ32(iattr->ia_mode);
315                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
316                 iattr->ia_valid |= ATTR_MODE;
317         }
318         if (bmval[1] & FATTR4_WORD1_OWNER) {
319                 READ_BUF(4);
320                 len += 4;
321                 READ32(dummy32);
322                 READ_BUF(dummy32);
323                 len += (XDR_QUADLEN(dummy32) << 2);
324                 READMEM(buf, dummy32);
325                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
326                         goto out_nfserr;
327                 iattr->ia_valid |= ATTR_UID;
328         }
329         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
330                 READ_BUF(4);
331                 len += 4;
332                 READ32(dummy32);
333                 READ_BUF(dummy32);
334                 len += (XDR_QUADLEN(dummy32) << 2);
335                 READMEM(buf, dummy32);
336                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
337                         goto out_nfserr;
338                 iattr->ia_valid |= ATTR_GID;
339         }
340         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
341                 READ_BUF(4);
342                 len += 4;
343                 READ32(dummy32);
344                 switch (dummy32) {
345                 case NFS4_SET_TO_CLIENT_TIME:
346                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
347                            all 32 bits of 'nseconds'. */
348                         READ_BUF(12);
349                         len += 12;
350                         READ32(dummy32);
351                         if (dummy32)
352                                 return nfserr_inval;
353                         READ32(iattr->ia_atime.tv_sec);
354                         READ32(iattr->ia_atime.tv_nsec);
355                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
356                                 return nfserr_inval;
357                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
358                         break;
359                 case NFS4_SET_TO_SERVER_TIME:
360                         iattr->ia_valid |= ATTR_ATIME;
361                         break;
362                 default:
363                         goto xdr_error;
364                 }
365         }
366         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
367                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
368                    all 32 bits of 'nseconds'. */
369                 READ_BUF(12);
370                 len += 12;
371                 READ32(dummy32);
372                 if (dummy32)
373                         return nfserr_inval;
374                 READ32(iattr->ia_ctime.tv_sec);
375                 READ32(iattr->ia_ctime.tv_nsec);
376                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
377                         return nfserr_inval;
378                 iattr->ia_valid |= ATTR_CTIME;
379         }
380         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
381                 READ_BUF(4);
382                 len += 4;
383                 READ32(dummy32);
384                 switch (dummy32) {
385                 case NFS4_SET_TO_CLIENT_TIME:
386                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
387                            all 32 bits of 'nseconds'. */
388                         READ_BUF(12);
389                         len += 12;
390                         READ32(dummy32);
391                         if (dummy32)
392                                 return nfserr_inval;
393                         READ32(iattr->ia_mtime.tv_sec);
394                         READ32(iattr->ia_mtime.tv_nsec);
395                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
396                                 return nfserr_inval;
397                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
398                         break;
399                 case NFS4_SET_TO_SERVER_TIME:
400                         iattr->ia_valid |= ATTR_MTIME;
401                         break;
402                 default:
403                         goto xdr_error;
404                 }
405         }
406         if (len != expected_len)
407                 goto xdr_error;
408
409         DECODE_TAIL;
410
411 out_nfserr:
412         status = nfserrno(status);
413         goto out;
414 }
415
416 static int
417 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
418 {
419         DECODE_HEAD;
420
421         READ_BUF(4);
422         READ32(access->ac_req_access);
423
424         DECODE_TAIL;
425 }
426
427 static int
428 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
429 {
430         DECODE_HEAD;
431
432         close->cl_stateowner = NULL;
433         READ_BUF(4 + sizeof(stateid_t));
434         READ32(close->cl_seqid);
435         READ32(close->cl_stateid.si_generation);
436         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
437
438         DECODE_TAIL;
439 }
440
441
442 static int
443 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
444 {
445         DECODE_HEAD;
446
447         READ_BUF(12);
448         READ64(commit->co_offset);
449         READ32(commit->co_count);
450
451         DECODE_TAIL;
452 }
453
454 static int
455 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
456 {
457         DECODE_HEAD;
458
459         READ_BUF(4);
460         READ32(create->cr_type);
461         switch (create->cr_type) {
462         case NF4LNK:
463                 READ_BUF(4);
464                 READ32(create->cr_linklen);
465                 READ_BUF(create->cr_linklen);
466                 SAVEMEM(create->cr_linkname, create->cr_linklen);
467                 break;
468         case NF4BLK:
469         case NF4CHR:
470                 READ_BUF(8);
471                 READ32(create->cr_specdata1);
472                 READ32(create->cr_specdata2);
473                 break;
474         case NF4SOCK:
475         case NF4FIFO:
476         case NF4DIR:
477         default:
478                 break;
479         }
480
481         READ_BUF(4);
482         READ32(create->cr_namelen);
483         READ_BUF(create->cr_namelen);
484         SAVEMEM(create->cr_name, create->cr_namelen);
485         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
486                 return status;
487
488         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
489                 goto out;
490
491         DECODE_TAIL;
492 }
493
494 static inline int
495 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
496 {
497         DECODE_HEAD;
498
499         READ_BUF(sizeof(stateid_t));
500         READ32(dr->dr_stateid.si_generation);
501         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
502
503         DECODE_TAIL;
504 }
505
506 static inline int
507 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
508 {
509         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
510 }
511
512 static int
513 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
514 {
515         DECODE_HEAD;
516
517         READ_BUF(4);
518         READ32(link->li_namelen);
519         READ_BUF(link->li_namelen);
520         SAVEMEM(link->li_name, link->li_namelen);
521         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
522                 return status;
523
524         DECODE_TAIL;
525 }
526
527 static int
528 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
529 {
530         DECODE_HEAD;
531
532         lock->lk_stateowner = NULL;
533         /*
534         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
535         */
536         READ_BUF(28);
537         READ32(lock->lk_type);
538         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
539                 goto xdr_error;
540         READ32(lock->lk_reclaim);
541         READ64(lock->lk_offset);
542         READ64(lock->lk_length);
543         READ32(lock->lk_is_new);
544
545         if (lock->lk_is_new) {
546                 READ_BUF(36);
547                 READ32(lock->lk_new_open_seqid);
548                 READ32(lock->lk_new_open_stateid.si_generation);
549
550                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
551                 READ32(lock->lk_new_lock_seqid);
552                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
553                 READ32(lock->lk_new_owner.len);
554                 READ_BUF(lock->lk_new_owner.len);
555                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
556         } else {
557                 READ_BUF(20);
558                 READ32(lock->lk_old_lock_stateid.si_generation);
559                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
560                 READ32(lock->lk_old_lock_seqid);
561         }
562
563         DECODE_TAIL;
564 }
565
566 static int
567 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
568 {
569         DECODE_HEAD;
570                         
571         READ_BUF(32);
572         READ32(lockt->lt_type);
573         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
574                 goto xdr_error;
575         READ64(lockt->lt_offset);
576         READ64(lockt->lt_length);
577         COPYMEM(&lockt->lt_clientid, 8);
578         READ32(lockt->lt_owner.len);
579         READ_BUF(lockt->lt_owner.len);
580         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
581
582         DECODE_TAIL;
583 }
584
585 static int
586 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
587 {
588         DECODE_HEAD;
589
590         locku->lu_stateowner = NULL;
591         READ_BUF(24 + sizeof(stateid_t));
592         READ32(locku->lu_type);
593         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
594                 goto xdr_error;
595         READ32(locku->lu_seqid);
596         READ32(locku->lu_stateid.si_generation);
597         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
598         READ64(locku->lu_offset);
599         READ64(locku->lu_length);
600
601         DECODE_TAIL;
602 }
603
604 static int
605 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
606 {
607         DECODE_HEAD;
608
609         READ_BUF(4);
610         READ32(lookup->lo_len);
611         READ_BUF(lookup->lo_len);
612         SAVEMEM(lookup->lo_name, lookup->lo_len);
613         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
614                 return status;
615
616         DECODE_TAIL;
617 }
618
619 static int
620 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
621 {
622         DECODE_HEAD;
623
624         memset(open->op_bmval, 0, sizeof(open->op_bmval));
625         open->op_iattr.ia_valid = 0;
626         open->op_stateowner = NULL;
627
628         /* seqid, share_access, share_deny, clientid, ownerlen */
629         READ_BUF(16 + sizeof(clientid_t));
630         READ32(open->op_seqid);
631         READ32(open->op_share_access);
632         READ32(open->op_share_deny);
633         COPYMEM(&open->op_clientid, sizeof(clientid_t));
634         READ32(open->op_owner.len);
635
636         /* owner, open_flag */
637         READ_BUF(open->op_owner.len + 4);
638         SAVEMEM(open->op_owner.data, open->op_owner.len);
639         READ32(open->op_create);
640         switch (open->op_create) {
641         case NFS4_OPEN_NOCREATE:
642                 break;
643         case NFS4_OPEN_CREATE:
644                 READ_BUF(4);
645                 READ32(open->op_createmode);
646                 switch (open->op_createmode) {
647                 case NFS4_CREATE_UNCHECKED:
648                 case NFS4_CREATE_GUARDED:
649                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
650                                 goto out;
651                         break;
652                 case NFS4_CREATE_EXCLUSIVE:
653                         READ_BUF(8);
654                         COPYMEM(open->op_verf.data, 8);
655                         break;
656                 default:
657                         goto xdr_error;
658                 }
659                 break;
660         default:
661                 goto xdr_error;
662         }
663
664         /* open_claim */
665         READ_BUF(4);
666         READ32(open->op_claim_type);
667         switch (open->op_claim_type) {
668         case NFS4_OPEN_CLAIM_NULL:
669         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
670                 READ_BUF(4);
671                 READ32(open->op_fname.len);
672                 READ_BUF(open->op_fname.len);
673                 SAVEMEM(open->op_fname.data, open->op_fname.len);
674                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
675                         return status;
676                 break;
677         case NFS4_OPEN_CLAIM_PREVIOUS:
678                 READ_BUF(4);
679                 READ32(open->op_delegate_type);
680                 break;
681         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
682                 READ_BUF(sizeof(stateid_t) + 4);
683                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
684                 READ32(open->op_fname.len);
685                 READ_BUF(open->op_fname.len);
686                 SAVEMEM(open->op_fname.data, open->op_fname.len);
687                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
688                         return status;
689                 break;
690         default:
691                 goto xdr_error;
692         }
693
694         DECODE_TAIL;
695 }
696
697 static int
698 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
699 {
700         DECODE_HEAD;
701                     
702         open_conf->oc_stateowner = NULL;
703         READ_BUF(4 + sizeof(stateid_t));
704         READ32(open_conf->oc_req_stateid.si_generation);
705         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
706         READ32(open_conf->oc_seqid);
707                                                         
708         DECODE_TAIL;
709 }
710
711 static int
712 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
713 {
714         DECODE_HEAD;
715                     
716         open_down->od_stateowner = NULL;
717         READ_BUF(12 + sizeof(stateid_t));
718         READ32(open_down->od_stateid.si_generation);
719         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
720         READ32(open_down->od_seqid);
721         READ32(open_down->od_share_access);
722         READ32(open_down->od_share_deny);
723                                                         
724         DECODE_TAIL;
725 }
726
727 static int
728 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
729 {
730         DECODE_HEAD;
731
732         READ_BUF(4);
733         READ32(putfh->pf_fhlen);
734         if (putfh->pf_fhlen > NFS4_FHSIZE)
735                 goto xdr_error;
736         READ_BUF(putfh->pf_fhlen);
737         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
738
739         DECODE_TAIL;
740 }
741
742 static int
743 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
744 {
745         DECODE_HEAD;
746
747         READ_BUF(sizeof(stateid_t) + 12);
748         READ32(read->rd_stateid.si_generation);
749         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
750         READ64(read->rd_offset);
751         READ32(read->rd_length);
752
753         DECODE_TAIL;
754 }
755
756 static int
757 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
758 {
759         DECODE_HEAD;
760
761         READ_BUF(24);
762         READ64(readdir->rd_cookie);
763         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
764         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
765         READ32(readdir->rd_maxcount);
766         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
767                 goto out;
768
769         DECODE_TAIL;
770 }
771
772 static int
773 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
774 {
775         DECODE_HEAD;
776
777         READ_BUF(4);
778         READ32(remove->rm_namelen);
779         READ_BUF(remove->rm_namelen);
780         SAVEMEM(remove->rm_name, remove->rm_namelen);
781         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
782                 return status;
783
784         DECODE_TAIL;
785 }
786
787 static int
788 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
789 {
790         DECODE_HEAD;
791
792         READ_BUF(4);
793         READ32(rename->rn_snamelen);
794         READ_BUF(rename->rn_snamelen + 4);
795         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
796         READ32(rename->rn_tnamelen);
797         READ_BUF(rename->rn_tnamelen);
798         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
799         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
800                 return status;
801         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
802                 return status;
803
804         DECODE_TAIL;
805 }
806
807 static int
808 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
809 {
810         DECODE_HEAD;
811
812         READ_BUF(sizeof(clientid_t));
813         COPYMEM(clientid, sizeof(clientid_t));
814
815         DECODE_TAIL;
816 }
817
818 static int
819 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
820 {
821         DECODE_HEAD;
822
823         READ_BUF(sizeof(stateid_t));
824         READ32(setattr->sa_stateid.si_generation);
825         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
826         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
827                 goto out;
828
829         DECODE_TAIL;
830 }
831
832 static int
833 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
834 {
835         DECODE_HEAD;
836
837         READ_BUF(12);
838         COPYMEM(setclientid->se_verf.data, 8);
839         READ32(setclientid->se_namelen);
840
841         READ_BUF(setclientid->se_namelen + 8);
842         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
843         READ32(setclientid->se_callback_prog);
844         READ32(setclientid->se_callback_netid_len);
845
846         READ_BUF(setclientid->se_callback_netid_len + 4);
847         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
848         READ32(setclientid->se_callback_addr_len);
849
850         READ_BUF(setclientid->se_callback_addr_len + 4);
851         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
852         READ32(setclientid->se_callback_ident);
853
854         DECODE_TAIL;
855 }
856
857 static int
858 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
859 {
860         DECODE_HEAD;
861
862         READ_BUF(8 + sizeof(nfs4_verifier));
863         COPYMEM(&scd_c->sc_clientid, 8);
864         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
865
866         DECODE_TAIL;
867 }
868
869 /* Also used for NVERIFY */
870 static int
871 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
872 {
873 #if 0
874         struct nfsd4_compoundargs save = {
875                 .p = argp->p,
876                 .end = argp->end,
877                 .rqstp = argp->rqstp,
878         };
879         u32             ve_bmval[2];
880         struct iattr    ve_iattr;           /* request */
881         struct nfs4_acl *ve_acl;            /* request */
882 #endif
883         DECODE_HEAD;
884
885         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
886                 goto out;
887
888         /* For convenience's sake, we compare raw xdr'd attributes in
889          * nfsd4_proc_verify; however we still decode here just to return
890          * correct error in case of bad xdr. */
891 #if 0
892         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
893         if (status == nfserr_inval) {
894                 status = nfserrno(status);
895                 goto out;
896         }
897 #endif
898         READ_BUF(4);
899         READ32(verify->ve_attrlen);
900         READ_BUF(verify->ve_attrlen);
901         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
902
903         DECODE_TAIL;
904 }
905
906 static int
907 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
908 {
909         int avail;
910         int v;
911         int len;
912         DECODE_HEAD;
913
914         READ_BUF(sizeof(stateid_opaque_t) + 20);
915         READ32(write->wr_stateid.si_generation);
916         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
917         READ64(write->wr_offset);
918         READ32(write->wr_stable_how);
919         if (write->wr_stable_how > 2)
920                 goto xdr_error;
921         READ32(write->wr_buflen);
922
923         /* Sorry .. no magic macros for this.. *
924          * READ_BUF(write->wr_buflen);
925          * SAVEMEM(write->wr_buf, write->wr_buflen);
926          */
927         avail = (char*)argp->end - (char*)argp->p;
928         if (avail + argp->pagelen < write->wr_buflen) {
929                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); 
930                 goto xdr_error;
931         }
932         write->wr_vec[0].iov_base = p;
933         write->wr_vec[0].iov_len = avail;
934         v = 0;
935         len = write->wr_buflen;
936         while (len > write->wr_vec[v].iov_len) {
937                 len -= write->wr_vec[v].iov_len;
938                 v++;
939                 write->wr_vec[v].iov_base = page_address(argp->pagelist[0]);
940                 argp->pagelist++;
941                 if (argp->pagelen >= PAGE_SIZE) {
942                         write->wr_vec[v].iov_len = PAGE_SIZE;
943                         argp->pagelen -= PAGE_SIZE;
944                 } else {
945                         write->wr_vec[v].iov_len = argp->pagelen;
946                         argp->pagelen -= len;
947                 }
948         }
949         argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len);
950         argp->p = (u32*)  (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
951         write->wr_vec[v].iov_len = len;
952         write->wr_vlen = v+1;
953
954         DECODE_TAIL;
955 }
956
957 static int
958 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
959 {
960         DECODE_HEAD;
961
962         READ_BUF(12);
963         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
964         READ32(rlockowner->rl_owner.len);
965         READ_BUF(rlockowner->rl_owner.len);
966         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
967
968         DECODE_TAIL;
969 }
970
971 static int
972 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
973 {
974         DECODE_HEAD;
975         struct nfsd4_op *op;
976         int i;
977
978         /*
979          * XXX: According to spec, we should check the tag
980          * for UTF-8 compliance.  I'm postponing this for
981          * now because it seems that some clients do use
982          * binary tags.
983          */
984         READ_BUF(4);
985         READ32(argp->taglen);
986         READ_BUF(argp->taglen + 8);
987         SAVEMEM(argp->tag, argp->taglen);
988         READ32(argp->minorversion);
989         READ32(argp->opcnt);
990
991         if (argp->taglen > NFSD4_MAX_TAGLEN)
992                 goto xdr_error;
993         if (argp->opcnt > 100)
994                 goto xdr_error;
995
996         if (argp->opcnt > sizeof(argp->iops)/sizeof(argp->iops[0])) {
997                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
998                 if (!argp->ops) {
999                         argp->ops = argp->iops;
1000                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1001                         goto xdr_error;
1002                 }
1003         }
1004
1005         for (i = 0; i < argp->opcnt; i++) {
1006                 op = &argp->ops[i];
1007                 op->replay = NULL;
1008
1009                 /*
1010                  * We can't use READ_BUF() here because we need to handle
1011                  * a missing opcode as an OP_WRITE + 1. So we need to check
1012                  * to see if we're truly at the end of our buffer or if there
1013                  * is another page we need to flip to.
1014                  */
1015
1016                 if (argp->p == argp->end) {
1017                         if (argp->pagelen < 4) {
1018                                 /* There isn't an opcode still on the wire */
1019                                 op->opnum = OP_WRITE + 1;
1020                                 op->status = nfserr_bad_xdr;
1021                                 argp->opcnt = i+1;
1022                                 break;
1023                         }
1024
1025                         /*
1026                          * False alarm. We just hit a page boundary, but there
1027                          * is still data available.  Move pointer across page
1028                          * boundary.  *snip from READ_BUF*
1029                          */
1030                         argp->p = page_address(argp->pagelist[0]);
1031                         argp->pagelist++;
1032                         if (argp->pagelen < PAGE_SIZE) {
1033                                 argp->end = p + (argp->pagelen>>2);
1034                                 argp->pagelen = 0;
1035                         } else {
1036                                 argp->end = p + (PAGE_SIZE>>2);
1037                                 argp->pagelen -= PAGE_SIZE;
1038                         }
1039                 }
1040                 op->opnum = ntohl(*argp->p++);
1041
1042                 switch (op->opnum) {
1043                 case 2: /* Reserved operation */
1044                         op->opnum = OP_ILLEGAL;
1045                         if (argp->minorversion == 0)
1046                                 op->status = nfserr_op_illegal;
1047                         else
1048                                 op->status = nfserr_minor_vers_mismatch;
1049                         break;
1050                 case OP_ACCESS:
1051                         op->status = nfsd4_decode_access(argp, &op->u.access);
1052                         break;
1053                 case OP_CLOSE:
1054                         op->status = nfsd4_decode_close(argp, &op->u.close);
1055                         break;
1056                 case OP_COMMIT:
1057                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1058                         break;
1059                 case OP_CREATE:
1060                         op->status = nfsd4_decode_create(argp, &op->u.create);
1061                         break;
1062                 case OP_DELEGRETURN:
1063                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1064                         break;
1065                 case OP_GETATTR:
1066                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1067                         break;
1068                 case OP_GETFH:
1069                         op->status = nfs_ok;
1070                         break;
1071                 case OP_LINK:
1072                         op->status = nfsd4_decode_link(argp, &op->u.link);
1073                         break;
1074                 case OP_LOCK:
1075                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1076                         break;
1077                 case OP_LOCKT:
1078                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1079                         break;
1080                 case OP_LOCKU:
1081                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1082                         break;
1083                 case OP_LOOKUP:
1084                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1085                         break;
1086                 case OP_LOOKUPP:
1087                         op->status = nfs_ok;
1088                         break;
1089                 case OP_NVERIFY:
1090                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1091                         break;
1092                 case OP_OPEN:
1093                         op->status = nfsd4_decode_open(argp, &op->u.open);
1094                         break;
1095                 case OP_OPEN_CONFIRM:
1096                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1097                         break;
1098                 case OP_OPEN_DOWNGRADE:
1099                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1100                         break;
1101                 case OP_PUTFH:
1102                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1103                         break;
1104                 case OP_PUTROOTFH:
1105                         op->status = nfs_ok;
1106                         break;
1107                 case OP_READ:
1108                         op->status = nfsd4_decode_read(argp, &op->u.read);
1109                         break;
1110                 case OP_READDIR:
1111                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1112                         break;
1113                 case OP_READLINK:
1114                         op->status = nfs_ok;
1115                         break;
1116                 case OP_REMOVE:
1117                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1118                         break;
1119                 case OP_RENAME:
1120                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1121                         break;
1122                 case OP_RESTOREFH:
1123                         op->status = nfs_ok;
1124                         break;
1125                 case OP_RENEW:
1126                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1127                         break;
1128                 case OP_SAVEFH:
1129                         op->status = nfs_ok;
1130                         break;
1131                 case OP_SETATTR:
1132                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1133                         break;
1134                 case OP_SETCLIENTID:
1135                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1136                         break;
1137                 case OP_SETCLIENTID_CONFIRM:
1138                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1139                         break;
1140                 case OP_VERIFY:
1141                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1142                         break;
1143                 case OP_WRITE:
1144                         op->status = nfsd4_decode_write(argp, &op->u.write);
1145                         break;
1146                 case OP_RELEASE_LOCKOWNER:
1147                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1148                         break;
1149                 default:
1150                         op->opnum = OP_ILLEGAL;
1151                         op->status = nfserr_op_illegal;
1152                         break;
1153                 }
1154
1155                 if (op->status) {
1156                         argp->opcnt = i+1;
1157                         break;
1158                 }
1159         }
1160
1161         DECODE_TAIL;
1162 }
1163 /*
1164  * END OF "GENERIC" DECODE ROUTINES.
1165  */
1166
1167 /*
1168  * START OF "GENERIC" ENCODE ROUTINES.
1169  *   These may look a little ugly since they are imported from a "generic"
1170  * set of XDR encode/decode routines which are intended to be shared by
1171  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1172  *
1173  * If the pain of reading these is too great, it should be a straightforward
1174  * task to translate them into Linux-specific versions which are more
1175  * consistent with the style used in NFSv2/v3...
1176  */
1177 #define ENCODE_HEAD              u32 *p
1178
1179 #define WRITE32(n)               *p++ = htonl(n)
1180 #define WRITE64(n)               do {                           \
1181         *p++ = htonl((u32)((n) >> 32));                         \
1182         *p++ = htonl((u32)(n));                                 \
1183 } while (0)
1184 #define WRITEMEM(ptr,nbytes)     do {                           \
1185         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1186         memcpy(p, ptr, nbytes);                                 \
1187         p += XDR_QUADLEN(nbytes);                               \
1188 } while (0)
1189 #define WRITECINFO(c)           do {                            \
1190         *p++ = htonl(c.atomic);                                 \
1191         *p++ = htonl(c.before_ctime_sec);                               \
1192         *p++ = htonl(c.before_ctime_nsec);                              \
1193         *p++ = htonl(c.after_ctime_sec);                                \
1194         *p++ = htonl(c.after_ctime_nsec);                               \
1195 } while (0)
1196
1197 #define RESERVE_SPACE(nbytes)   do {                            \
1198         p = resp->p;                                            \
1199         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1200 } while (0)
1201 #define ADJUST_ARGS()           resp->p = p
1202
1203 /*
1204  * Header routine to setup seqid operation replay cache
1205  */
1206 #define ENCODE_SEQID_OP_HEAD                                    \
1207         u32 *p;                                                 \
1208         u32 *save;                                              \
1209                                                                 \
1210         save = resp->p;
1211
1212 /*
1213  * Routine for encoding the result of a
1214  * "seqid-mutating" NFSv4 operation.  This is
1215  * where seqids are incremented, and the
1216  * replay cache is filled.
1217  */
1218
1219 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1220         if (seqid_mutating_err(nfserr) && stateowner) {         \
1221                 if (stateowner->so_confirmed)                   \
1222                         stateowner->so_seqid++;                 \
1223                 stateowner->so_replay.rp_status = nfserr;       \
1224                 stateowner->so_replay.rp_buflen =               \
1225                           (((char *)(resp)->p - (char *)save)); \
1226                 memcpy(stateowner->so_replay.rp_buf, save,      \
1227                         stateowner->so_replay.rp_buflen);       \
1228         } } while (0);
1229
1230
1231 static u32 nfs4_ftypes[16] = {
1232         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1233         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1234         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1235         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1236 };
1237
1238 static int
1239 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1240                         u32 **p, int *buflen)
1241 {
1242         int status;
1243
1244         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1245                 return nfserr_resource;
1246         if (whotype != NFS4_ACL_WHO_NAMED)
1247                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1248         else if (group)
1249                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1250         else
1251                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1252         if (status < 0)
1253                 return nfserrno(status);
1254         *p = xdr_encode_opaque(*p, NULL, status);
1255         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1256         BUG_ON(*buflen < 0);
1257         return 0;
1258 }
1259
1260 static inline int
1261 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
1262 {
1263         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1264 }
1265
1266 static inline int
1267 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
1268 {
1269         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1270 }
1271
1272 static inline int
1273 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1274                 u32 **p, int *buflen)
1275 {
1276         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1277 }
1278
1279
1280 /*
1281  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1282  * ourselves.
1283  *
1284  * @countp is the buffer size in _words_; upon successful return this becomes
1285  * replaced with the number of words written.
1286  */
1287 int
1288 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1289                 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
1290                 struct svc_rqst *rqstp)
1291 {
1292         u32 bmval0 = bmval[0];
1293         u32 bmval1 = bmval[1];
1294         struct kstat stat;
1295         struct svc_fh tempfh;
1296         struct kstatfs statfs;
1297         int buflen = *countp << 2;
1298         u32 *attrlenp;
1299         u32 dummy;
1300         u64 dummy64;
1301         u32 *p = buffer;
1302         int status;
1303         int aclsupport = 0;
1304         struct nfs4_acl *acl = NULL;
1305
1306         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1307         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1308         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1309
1310         status = vfs_getattr(exp->ex_mnt, dentry, &stat);
1311         if (status)
1312                 goto out_nfserr;
1313         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1314             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1315                        FATTR4_WORD1_SPACE_TOTAL))) {
1316                 status = vfs_statfs(dentry->d_inode->i_sb, &statfs);
1317                 if (status)
1318                         goto out_nfserr;
1319         }
1320         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1321                 fh_init(&tempfh, NFS4_FHSIZE);
1322                 status = fh_compose(&tempfh, exp, dentry, NULL);
1323                 if (status)
1324                         goto out;
1325                 fhp = &tempfh;
1326         }
1327         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1328                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1329                 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1330                 aclsupport = (status == 0);
1331                 if (bmval0 & FATTR4_WORD0_ACL) {
1332                         if (status == -EOPNOTSUPP)
1333                                 bmval0 &= ~FATTR4_WORD0_ACL;
1334                         else if (status == -EINVAL) {
1335                                 status = nfserr_attrnotsupp;
1336                                 goto out;
1337                         } else if (status != 0)
1338                                 goto out_nfserr;
1339                 }
1340         }
1341         if ((buflen -= 16) < 0)
1342                 goto out_resource;
1343
1344         WRITE32(2);
1345         WRITE32(bmval0);
1346         WRITE32(bmval1);
1347         attrlenp = p++;                /* to be backfilled later */
1348
1349         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1350                 if ((buflen -= 12) < 0)
1351                         goto out_resource;
1352                 WRITE32(2);
1353                 WRITE32(aclsupport ?
1354                         NFSD_SUPPORTED_ATTRS_WORD0 :
1355                         NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
1356                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1357         }
1358         if (bmval0 & FATTR4_WORD0_TYPE) {
1359                 if ((buflen -= 4) < 0)
1360                         goto out_resource;
1361                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1362                 if (dummy == NF4BAD)
1363                         goto out_serverfault;
1364                 WRITE32(dummy);
1365         }
1366         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1367                 if ((buflen -= 4) < 0)
1368                         goto out_resource;
1369                 WRITE32( NFS4_FH_NOEXPIRE_WITH_OPEN | 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                 nfserr = nfserr_toosmall;
1767                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1768                 if (p == NULL)
1769                         goto fail;
1770         }
1771         cd->buflen -= (p - cd->buffer);
1772         cd->buffer = p;
1773         cd->common.err = nfs_ok;
1774         return 0;
1775 fail:
1776         cd->common.err = nfserr;
1777         return -EINVAL;
1778 }
1779
1780 static void
1781 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access)
1782 {
1783         ENCODE_HEAD;
1784
1785         if (!nfserr) {
1786                 RESERVE_SPACE(8);
1787                 WRITE32(access->ac_supported);
1788                 WRITE32(access->ac_resp_access);
1789                 ADJUST_ARGS();
1790         }
1791 }
1792
1793 static void
1794 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close)
1795 {
1796         ENCODE_SEQID_OP_HEAD;
1797
1798         if (!nfserr) {
1799                 RESERVE_SPACE(sizeof(stateid_t));
1800                 WRITE32(close->cl_stateid.si_generation);
1801                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1802                 ADJUST_ARGS();
1803         }
1804         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1805 }
1806
1807
1808 static void
1809 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit)
1810 {
1811         ENCODE_HEAD;
1812
1813         if (!nfserr) {
1814                 RESERVE_SPACE(8);
1815                 WRITEMEM(commit->co_verf.data, 8);
1816                 ADJUST_ARGS();
1817         }
1818 }
1819
1820 static void
1821 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create)
1822 {
1823         ENCODE_HEAD;
1824
1825         if (!nfserr) {
1826                 RESERVE_SPACE(32);
1827                 WRITECINFO(create->cr_cinfo);
1828                 WRITE32(2);
1829                 WRITE32(create->cr_bmval[0]);
1830                 WRITE32(create->cr_bmval[1]);
1831                 ADJUST_ARGS();
1832         }
1833 }
1834
1835 static int
1836 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr)
1837 {
1838         struct svc_fh *fhp = getattr->ga_fhp;
1839         int buflen;
1840
1841         if (nfserr)
1842                 return nfserr;
1843
1844         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
1845         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
1846                                     resp->p, &buflen, getattr->ga_bmval,
1847                                     resp->rqstp);
1848
1849         if (!nfserr)
1850                 resp->p += buflen;
1851         return nfserr;
1852 }
1853
1854 static void
1855 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp)
1856 {
1857         unsigned int len;
1858         ENCODE_HEAD;
1859
1860         if (!nfserr) {
1861                 len = fhp->fh_handle.fh_size;
1862                 RESERVE_SPACE(len + 4);
1863                 WRITE32(len);
1864                 WRITEMEM(&fhp->fh_handle.fh_base, len);
1865                 ADJUST_ARGS();
1866         }
1867 }
1868
1869 /*
1870 * Including all fields other than the name, a LOCK4denied structure requires
1871 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
1872 */
1873 static void
1874 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
1875 {
1876         ENCODE_HEAD;
1877
1878         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
1879         WRITE64(ld->ld_start);
1880         WRITE64(ld->ld_length);
1881         WRITE32(ld->ld_type);
1882         if (ld->ld_sop) {
1883                 WRITEMEM(&ld->ld_clientid, 8);
1884                 WRITE32(ld->ld_sop->so_owner.len);
1885                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
1886                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
1887         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
1888                 WRITE64((u64)0); /* clientid */
1889                 WRITE32(0); /* length of owner name */
1890         }
1891         ADJUST_ARGS();
1892 }
1893
1894 static void
1895 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
1896 {
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_stateowner);
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(0);
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*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2088
2089         resp->xbuf->page_len = maxcount;
2090
2091         /* read zero bytes -> don't set up tail */
2092         if(!maxcount)
2093                 return 0;        
2094
2095         /* set up page for remaining responses */
2096         svc_take_page(resp->rqstp);
2097         resp->xbuf->tail[0].iov_base = 
2098                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2099         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2100         resp->xbuf->tail[0].iov_len = 0;
2101         resp->p = resp->xbuf->tail[0].iov_base;
2102         resp->end = resp->p + PAGE_SIZE/4;
2103
2104         if (maxcount&3) {
2105                 *(resp->p)++ = 0;
2106                 resp->xbuf->tail[0].iov_base += maxcount&3;
2107                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2108         }
2109         return 0;
2110 }
2111
2112 static int
2113 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
2114 {
2115         int maxcount;
2116         char *page;
2117         ENCODE_HEAD;
2118
2119         if (nfserr)
2120                 return nfserr;
2121         if (resp->xbuf->page_len)
2122                 return nfserr_resource;
2123
2124         svc_take_page(resp->rqstp);
2125         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2126
2127         maxcount = PAGE_SIZE;
2128         RESERVE_SPACE(4);
2129
2130         /*
2131          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2132          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2133          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2134          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2135          */
2136         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2137         if (nfserr == nfserr_isdir)
2138                 return nfserr_inval;
2139         if (nfserr)
2140                 return nfserr;
2141
2142         WRITE32(maxcount);
2143         ADJUST_ARGS();
2144         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2145
2146         svc_take_page(resp->rqstp);
2147         resp->xbuf->tail[0].iov_base = 
2148                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2149         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2150         resp->xbuf->tail[0].iov_len = 0;
2151         resp->p = resp->xbuf->tail[0].iov_base;
2152         resp->end = resp->p + PAGE_SIZE/4;
2153
2154         resp->xbuf->page_len = maxcount;
2155         if (maxcount&3) {
2156                 *(resp->p)++ = 0;
2157                 resp->xbuf->tail[0].iov_base += maxcount&3;
2158                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2159         }
2160         return 0;
2161 }
2162
2163 static int
2164 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
2165 {
2166         int maxcount;
2167         loff_t offset;
2168         u32 *page, *savep;
2169         ENCODE_HEAD;
2170
2171         if (nfserr)
2172                 return nfserr;
2173         if (resp->xbuf->page_len)
2174                 return nfserr_resource;
2175
2176         RESERVE_SPACE(8);  /* verifier */
2177         savep = p;
2178
2179         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2180         WRITE32(0);
2181         WRITE32(0);
2182         ADJUST_ARGS();
2183         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2184
2185         maxcount = PAGE_SIZE;
2186         if (maxcount > readdir->rd_maxcount)
2187                 maxcount = readdir->rd_maxcount;
2188
2189         /*
2190          * Convert from bytes to words, account for the two words already
2191          * written, make sure to leave two words at the end for the next
2192          * pointer and eof field.
2193          */
2194         maxcount = (maxcount >> 2) - 4;
2195         if (maxcount < 0) {
2196                 nfserr =  nfserr_toosmall;
2197                 goto err_no_verf;
2198         }
2199
2200         svc_take_page(resp->rqstp);
2201         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2202         readdir->common.err = 0;
2203         readdir->buflen = maxcount;
2204         readdir->buffer = page;
2205         readdir->offset = NULL;
2206
2207         offset = readdir->rd_cookie;
2208         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2209                               &offset,
2210                               &readdir->common, nfsd4_encode_dirent);
2211         if (nfserr == nfs_ok &&
2212             readdir->common.err == nfserr_toosmall &&
2213             readdir->buffer == page) 
2214                 nfserr = nfserr_toosmall;
2215         if (nfserr == nfserr_symlink)
2216                 nfserr = nfserr_notdir;
2217         if (nfserr)
2218                 goto err_no_verf;
2219
2220         if (readdir->offset)
2221                 xdr_encode_hyper(readdir->offset, offset);
2222
2223         p = readdir->buffer;
2224         *p++ = 0;       /* no more entries */
2225         *p++ = htonl(readdir->common.err == nfserr_eof);
2226         resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2227
2228         /* allocate a page for the tail */
2229         svc_take_page(resp->rqstp);
2230         resp->xbuf->tail[0].iov_base = 
2231                 page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2232         resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
2233         resp->xbuf->tail[0].iov_len = 0;
2234         resp->p = resp->xbuf->tail[0].iov_base;
2235         resp->end = resp->p + PAGE_SIZE/4;
2236
2237         return 0;
2238 err_no_verf:
2239         p = savep;
2240         ADJUST_ARGS();
2241         return nfserr;
2242 }
2243
2244 static void
2245 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
2246 {
2247         ENCODE_HEAD;
2248
2249         if (!nfserr) {
2250                 RESERVE_SPACE(20);
2251                 WRITECINFO(remove->rm_cinfo);
2252                 ADJUST_ARGS();
2253         }
2254 }
2255
2256 static void
2257 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
2258 {
2259         ENCODE_HEAD;
2260
2261         if (!nfserr) {
2262                 RESERVE_SPACE(40);
2263                 WRITECINFO(rename->rn_sinfo);
2264                 WRITECINFO(rename->rn_tinfo);
2265                 ADJUST_ARGS();
2266         }
2267 }
2268
2269 /*
2270  * The SETATTR encode routine is special -- it always encodes a bitmap,
2271  * regardless of the error status.
2272  */
2273 static void
2274 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
2275 {
2276         ENCODE_HEAD;
2277
2278         RESERVE_SPACE(12);
2279         if (nfserr) {
2280                 WRITE32(2);
2281                 WRITE32(0);
2282                 WRITE32(0);
2283         }
2284         else {
2285                 WRITE32(2);
2286                 WRITE32(setattr->sa_bmval[0]);
2287                 WRITE32(setattr->sa_bmval[1]);
2288         }
2289         ADJUST_ARGS();
2290 }
2291
2292 static void
2293 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
2294 {
2295         ENCODE_HEAD;
2296
2297         if (!nfserr) {
2298                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2299                 WRITEMEM(&scd->se_clientid, 8);
2300                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2301                 ADJUST_ARGS();
2302         }
2303         else if (nfserr == nfserr_clid_inuse) {
2304                 RESERVE_SPACE(8);
2305                 WRITE32(0);
2306                 WRITE32(0);
2307                 ADJUST_ARGS();
2308         }
2309 }
2310
2311 static void
2312 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
2313 {
2314         ENCODE_HEAD;
2315
2316         if (!nfserr) {
2317                 RESERVE_SPACE(16);
2318                 WRITE32(write->wr_bytes_written);
2319                 WRITE32(write->wr_how_written);
2320                 WRITEMEM(write->wr_verifier.data, 8);
2321                 ADJUST_ARGS();
2322         }
2323 }
2324
2325 void
2326 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2327 {
2328         u32 *statp;
2329         ENCODE_HEAD;
2330
2331         RESERVE_SPACE(8);
2332         WRITE32(op->opnum);
2333         statp = p++;    /* to be backfilled at the end */
2334         ADJUST_ARGS();
2335
2336         switch (op->opnum) {
2337         case OP_ACCESS:
2338                 nfsd4_encode_access(resp, op->status, &op->u.access);
2339                 break;
2340         case OP_CLOSE:
2341                 nfsd4_encode_close(resp, op->status, &op->u.close);
2342                 break;
2343         case OP_COMMIT:
2344                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2345                 break;
2346         case OP_CREATE:
2347                 nfsd4_encode_create(resp, op->status, &op->u.create);
2348                 break;
2349         case OP_DELEGRETURN:
2350                 break;
2351         case OP_GETATTR:
2352                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2353                 break;
2354         case OP_GETFH:
2355                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2356                 break;
2357         case OP_LINK:
2358                 nfsd4_encode_link(resp, op->status, &op->u.link);
2359                 break;
2360         case OP_LOCK:
2361                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2362                 break;
2363         case OP_LOCKT:
2364                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2365                 break;
2366         case OP_LOCKU:
2367                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2368                 break;
2369         case OP_LOOKUP:
2370                 break;
2371         case OP_LOOKUPP:
2372                 break;
2373         case OP_NVERIFY:
2374                 break;
2375         case OP_OPEN:
2376                 nfsd4_encode_open(resp, op->status, &op->u.open);
2377                 break;
2378         case OP_OPEN_CONFIRM:
2379                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2380                 break;
2381         case OP_OPEN_DOWNGRADE:
2382                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2383                 break;
2384         case OP_PUTFH:
2385                 break;
2386         case OP_PUTROOTFH:
2387                 break;
2388         case OP_READ:
2389                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2390                 break;
2391         case OP_READDIR:
2392                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2393                 break;
2394         case OP_READLINK:
2395                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2396                 break;
2397         case OP_REMOVE:
2398                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2399                 break;
2400         case OP_RENAME:
2401                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2402                 break;
2403         case OP_RENEW:
2404                 break;
2405         case OP_RESTOREFH:
2406                 break;
2407         case OP_SAVEFH:
2408                 break;
2409         case OP_SETATTR:
2410                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2411                 break;
2412         case OP_SETCLIENTID:
2413                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2414                 break;
2415         case OP_SETCLIENTID_CONFIRM:
2416                 break;
2417         case OP_VERIFY:
2418                 break;
2419         case OP_WRITE:
2420                 nfsd4_encode_write(resp, op->status, &op->u.write);
2421                 break;
2422         case OP_RELEASE_LOCKOWNER:
2423                 break;
2424         default:
2425                 break;
2426         }
2427
2428         /*
2429          * Note: We write the status directly, instead of using WRITE32(),
2430          * since it is already in network byte order.
2431          */
2432         *statp = op->status;
2433 }
2434
2435 /* 
2436  * Encode the reply stored in the stateowner reply cache 
2437  * 
2438  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2439  * previously sent already encoded operation.
2440  *
2441  * called with nfs4_lock_state() held
2442  */
2443 void
2444 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2445 {
2446         ENCODE_HEAD;
2447         struct nfs4_replay *rp = op->replay;
2448
2449         BUG_ON(!rp);
2450
2451         RESERVE_SPACE(8);
2452         WRITE32(op->opnum);
2453         *p++ = rp->rp_status;  /* already xdr'ed */
2454         ADJUST_ARGS();
2455
2456         RESERVE_SPACE(rp->rp_buflen);
2457         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2458         ADJUST_ARGS();
2459 }
2460
2461 /*
2462  * END OF "GENERIC" ENCODE ROUTINES.
2463  */
2464
2465 int
2466 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
2467 {
2468         return xdr_ressize_check(rqstp, p);
2469 }
2470
2471 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2472 {
2473         if (args->ops != args->iops) {
2474                 kfree(args->ops);
2475                 args->ops = args->iops;
2476         }
2477         if (args->tmpp) {
2478                 kfree(args->tmpp);
2479                 args->tmpp = NULL;
2480         }
2481         while (args->to_free) {
2482                 struct tmpbuf *tb = args->to_free;
2483                 args->to_free = tb->next;
2484                 tb->release(tb->buf);
2485                 kfree(tb);
2486         }
2487 }
2488
2489 int
2490 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
2491 {
2492         int status;
2493
2494         args->p = p;
2495         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2496         args->pagelist = rqstp->rq_arg.pages;
2497         args->pagelen = rqstp->rq_arg.page_len;
2498         args->tmpp = NULL;
2499         args->to_free = NULL;
2500         args->ops = args->iops;
2501         args->rqstp = rqstp;
2502
2503         status = nfsd4_decode_compound(args);
2504         if (status) {
2505                 nfsd4_release_compoundargs(args);
2506         }
2507         return !status;
2508 }
2509
2510 int
2511 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
2512 {
2513         /*
2514          * All that remains is to write the tag and operation count...
2515          */
2516         struct kvec *iov;
2517         p = resp->tagp;
2518         *p++ = htonl(resp->taglen);
2519         memcpy(p, resp->tag, resp->taglen);
2520         p += XDR_QUADLEN(resp->taglen);
2521         *p++ = htonl(resp->opcnt);
2522
2523         if (rqstp->rq_res.page_len) 
2524                 iov = &rqstp->rq_res.tail[0];
2525         else
2526                 iov = &rqstp->rq_res.head[0];
2527         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2528         BUG_ON(iov->iov_len > PAGE_SIZE);
2529         return 1;
2530 }
2531
2532 /*
2533  * Local variables:
2534  *  c-basic-offset: 8
2535  * End:
2536  */