[PATCH] knfsd: nfsd4: represent nfsv4 acl with array instead of linked list
[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 /*
64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
65  * directory in order to indicate to the client that a filesystem boundary is present
66  * We use a fixed fsid for a referral
67  */
68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
70
71 static __be32
72 check_filename(char *str, int len, __be32 err)
73 {
74         int i;
75
76         if (len == 0)
77                 return nfserr_inval;
78         if (isdotent(str, len))
79                 return err;
80         for (i = 0; i < len; i++)
81                 if (str[i] == '/')
82                         return err;
83         return 0;
84 }
85
86 /*
87  * START OF "GENERIC" DECODE ROUTINES.
88  *   These may look a little ugly since they are imported from a "generic"
89  * set of XDR encode/decode routines which are intended to be shared by
90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
91  *
92  * If the pain of reading these is too great, it should be a straightforward
93  * task to translate them into Linux-specific versions which are more
94  * consistent with the style used in NFSv2/v3...
95  */
96 #define DECODE_HEAD                             \
97         __be32 *p;                              \
98         __be32 status
99 #define DECODE_TAIL                             \
100         status = 0;                             \
101 out:                                            \
102         return status;                          \
103 xdr_error:                                      \
104         printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
105         status = nfserr_bad_xdr;                \
106         goto out
107
108 #define READ32(x)         (x) = ntohl(*p++)
109 #define READ64(x)         do {                  \
110         (x) = (u64)ntohl(*p++) << 32;           \
111         (x) |= ntohl(*p++);                     \
112 } while (0)
113 #define READTIME(x)       do {                  \
114         p++;                                    \
115         (x) = ntohl(*p++);                      \
116         p++;                                    \
117 } while (0)
118 #define READMEM(x,nbytes) do {                  \
119         x = (char *)p;                          \
120         p += XDR_QUADLEN(nbytes);               \
121 } while (0)
122 #define SAVEMEM(x,nbytes) do {                  \
123         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
124                 savemem(argp, p, nbytes) :      \
125                 (char *)p)) {                   \
126                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
127                 goto xdr_error;                 \
128                 }                               \
129         p += XDR_QUADLEN(nbytes);               \
130 } while (0)
131 #define COPYMEM(x,nbytes) do {                  \
132         memcpy((x), p, nbytes);                 \
133         p += XDR_QUADLEN(nbytes);               \
134 } while (0)
135
136 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
137 #define READ_BUF(nbytes)  do {                  \
138         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
139                 p = argp->p;                    \
140                 argp->p += XDR_QUADLEN(nbytes); \
141         } else if (!(p = read_buf(argp, nbytes))) { \
142                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
143                 goto xdr_error;                 \
144         }                                       \
145 } while (0)
146
147 static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
148 {
149         /* We want more bytes than seem to be available.
150          * Maybe we need a new page, maybe we have just run out
151          */
152         int avail = (char*)argp->end - (char*)argp->p;
153         __be32 *p;
154         if (avail + argp->pagelen < nbytes)
155                 return NULL;
156         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
157                 return NULL;
158         /* ok, we can do it with the current plus the next page */
159         if (nbytes <= sizeof(argp->tmp))
160                 p = argp->tmp;
161         else {
162                 kfree(argp->tmpp);
163                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
164                 if (!p)
165                         return NULL;
166                 
167         }
168         memcpy(p, argp->p, avail);
169         /* step to next page */
170         argp->p = page_address(argp->pagelist[0]);
171         argp->pagelist++;
172         if (argp->pagelen < PAGE_SIZE) {
173                 argp->end = p + (argp->pagelen>>2);
174                 argp->pagelen = 0;
175         } else {
176                 argp->end = p + (PAGE_SIZE>>2);
177                 argp->pagelen -= PAGE_SIZE;
178         }
179         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
180         argp->p += XDR_QUADLEN(nbytes - avail);
181         return p;
182 }
183
184 static int
185 defer_free(struct nfsd4_compoundargs *argp,
186                 void (*release)(const void *), void *p)
187 {
188         struct tmpbuf *tb;
189
190         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
191         if (!tb)
192                 return -ENOMEM;
193         tb->buf = p;
194         tb->release = release;
195         tb->next = argp->to_free;
196         argp->to_free = tb;
197         return 0;
198 }
199
200 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
201 {
202         void *new = NULL;
203         if (p == argp->tmp) {
204                 new = kmalloc(nbytes, GFP_KERNEL);
205                 if (!new) return NULL;
206                 p = new;
207                 memcpy(p, argp->tmp, nbytes);
208         } else {
209                 BUG_ON(p != argp->tmpp);
210                 argp->tmpp = NULL;
211         }
212         if (defer_free(argp, kfree, p)) {
213                 kfree(new);
214                 return NULL;
215         } else
216                 return (char *)p;
217 }
218
219
220 static __be32
221 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
222 {
223         u32 bmlen;
224         DECODE_HEAD;
225
226         bmval[0] = 0;
227         bmval[1] = 0;
228
229         READ_BUF(4);
230         READ32(bmlen);
231         if (bmlen > 1000)
232                 goto xdr_error;
233
234         READ_BUF(bmlen << 2);
235         if (bmlen > 0)
236                 READ32(bmval[0]);
237         if (bmlen > 1)
238                 READ32(bmval[1]);
239
240         DECODE_TAIL;
241 }
242
243 static __be32
244 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
245     struct nfs4_acl **acl)
246 {
247         int expected_len, len = 0;
248         u32 dummy32;
249         char *buf;
250         int host_err;
251
252         DECODE_HEAD;
253         iattr->ia_valid = 0;
254         if ((status = nfsd4_decode_bitmap(argp, bmval)))
255                 return status;
256
257         /*
258          * According to spec, unsupported attributes return ERR_NOTSUPP;
259          * read-only attributes return ERR_INVAL.
260          */
261         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
262                 return nfserr_attrnotsupp;
263         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
264                 return nfserr_inval;
265
266         READ_BUF(4);
267         READ32(expected_len);
268
269         if (bmval[0] & FATTR4_WORD0_SIZE) {
270                 READ_BUF(8);
271                 len += 8;
272                 READ64(iattr->ia_size);
273                 iattr->ia_valid |= ATTR_SIZE;
274         }
275         if (bmval[0] & FATTR4_WORD0_ACL) {
276                 int nace;
277                 struct nfs4_ace *ace;
278
279                 READ_BUF(4); len += 4;
280                 READ32(nace);
281
282                 if (nace > NFS4_ACL_MAX)
283                         return nfserr_resource;
284
285                 *acl = nfs4_acl_new(nace);
286                 if (*acl == NULL) {
287                         host_err = -ENOMEM;
288                         goto out_nfserr;
289                 }
290                 defer_free(argp, kfree, *acl);
291
292                 (*acl)->naces = nace;
293                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
294                         READ_BUF(16); len += 16;
295                         READ32(ace->type);
296                         READ32(ace->flag);
297                         READ32(ace->access_mask);
298                         READ32(dummy32);
299                         READ_BUF(dummy32);
300                         len += XDR_QUADLEN(dummy32) << 2;
301                         READMEM(buf, dummy32);
302                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
303                         host_err = 0;
304                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
305                                 ace->who = 0;
306                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
307                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
308                                                 buf, dummy32, &ace->who);
309                         else
310                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
311                                                 buf, dummy32, &ace->who);
312                         if (host_err)
313                                 goto out_nfserr;
314                 }
315         } else
316                 *acl = NULL;
317         if (bmval[1] & FATTR4_WORD1_MODE) {
318                 READ_BUF(4);
319                 len += 4;
320                 READ32(iattr->ia_mode);
321                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
322                 iattr->ia_valid |= ATTR_MODE;
323         }
324         if (bmval[1] & FATTR4_WORD1_OWNER) {
325                 READ_BUF(4);
326                 len += 4;
327                 READ32(dummy32);
328                 READ_BUF(dummy32);
329                 len += (XDR_QUADLEN(dummy32) << 2);
330                 READMEM(buf, dummy32);
331                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
332                         goto out_nfserr;
333                 iattr->ia_valid |= ATTR_UID;
334         }
335         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
336                 READ_BUF(4);
337                 len += 4;
338                 READ32(dummy32);
339                 READ_BUF(dummy32);
340                 len += (XDR_QUADLEN(dummy32) << 2);
341                 READMEM(buf, dummy32);
342                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
343                         goto out_nfserr;
344                 iattr->ia_valid |= ATTR_GID;
345         }
346         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
347                 READ_BUF(4);
348                 len += 4;
349                 READ32(dummy32);
350                 switch (dummy32) {
351                 case NFS4_SET_TO_CLIENT_TIME:
352                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
353                            all 32 bits of 'nseconds'. */
354                         READ_BUF(12);
355                         len += 12;
356                         READ32(dummy32);
357                         if (dummy32)
358                                 return nfserr_inval;
359                         READ32(iattr->ia_atime.tv_sec);
360                         READ32(iattr->ia_atime.tv_nsec);
361                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
362                                 return nfserr_inval;
363                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
364                         break;
365                 case NFS4_SET_TO_SERVER_TIME:
366                         iattr->ia_valid |= ATTR_ATIME;
367                         break;
368                 default:
369                         goto xdr_error;
370                 }
371         }
372         if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
373                 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
374                    all 32 bits of 'nseconds'. */
375                 READ_BUF(12);
376                 len += 12;
377                 READ32(dummy32);
378                 if (dummy32)
379                         return nfserr_inval;
380                 READ32(iattr->ia_ctime.tv_sec);
381                 READ32(iattr->ia_ctime.tv_nsec);
382                 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
383                         return nfserr_inval;
384                 iattr->ia_valid |= ATTR_CTIME;
385         }
386         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
387                 READ_BUF(4);
388                 len += 4;
389                 READ32(dummy32);
390                 switch (dummy32) {
391                 case NFS4_SET_TO_CLIENT_TIME:
392                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
393                            all 32 bits of 'nseconds'. */
394                         READ_BUF(12);
395                         len += 12;
396                         READ32(dummy32);
397                         if (dummy32)
398                                 return nfserr_inval;
399                         READ32(iattr->ia_mtime.tv_sec);
400                         READ32(iattr->ia_mtime.tv_nsec);
401                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
402                                 return nfserr_inval;
403                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
404                         break;
405                 case NFS4_SET_TO_SERVER_TIME:
406                         iattr->ia_valid |= ATTR_MTIME;
407                         break;
408                 default:
409                         goto xdr_error;
410                 }
411         }
412         if (len != expected_len)
413                 goto xdr_error;
414
415         DECODE_TAIL;
416
417 out_nfserr:
418         status = nfserrno(host_err);
419         goto out;
420 }
421
422 static __be32
423 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
424 {
425         DECODE_HEAD;
426
427         READ_BUF(4);
428         READ32(access->ac_req_access);
429
430         DECODE_TAIL;
431 }
432
433 static __be32
434 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
435 {
436         DECODE_HEAD;
437
438         close->cl_stateowner = NULL;
439         READ_BUF(4 + sizeof(stateid_t));
440         READ32(close->cl_seqid);
441         READ32(close->cl_stateid.si_generation);
442         COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
443
444         DECODE_TAIL;
445 }
446
447
448 static __be32
449 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
450 {
451         DECODE_HEAD;
452
453         READ_BUF(12);
454         READ64(commit->co_offset);
455         READ32(commit->co_count);
456
457         DECODE_TAIL;
458 }
459
460 static __be32
461 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
462 {
463         DECODE_HEAD;
464
465         READ_BUF(4);
466         READ32(create->cr_type);
467         switch (create->cr_type) {
468         case NF4LNK:
469                 READ_BUF(4);
470                 READ32(create->cr_linklen);
471                 READ_BUF(create->cr_linklen);
472                 SAVEMEM(create->cr_linkname, create->cr_linklen);
473                 break;
474         case NF4BLK:
475         case NF4CHR:
476                 READ_BUF(8);
477                 READ32(create->cr_specdata1);
478                 READ32(create->cr_specdata2);
479                 break;
480         case NF4SOCK:
481         case NF4FIFO:
482         case NF4DIR:
483         default:
484                 break;
485         }
486
487         READ_BUF(4);
488         READ32(create->cr_namelen);
489         READ_BUF(create->cr_namelen);
490         SAVEMEM(create->cr_name, create->cr_namelen);
491         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
492                 return status;
493
494         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
495                 goto out;
496
497         DECODE_TAIL;
498 }
499
500 static inline __be32
501 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
502 {
503         DECODE_HEAD;
504
505         READ_BUF(sizeof(stateid_t));
506         READ32(dr->dr_stateid.si_generation);
507         COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
508
509         DECODE_TAIL;
510 }
511
512 static inline __be32
513 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
514 {
515         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
516 }
517
518 static __be32
519 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
520 {
521         DECODE_HEAD;
522
523         READ_BUF(4);
524         READ32(link->li_namelen);
525         READ_BUF(link->li_namelen);
526         SAVEMEM(link->li_name, link->li_namelen);
527         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
528                 return status;
529
530         DECODE_TAIL;
531 }
532
533 static __be32
534 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
535 {
536         DECODE_HEAD;
537
538         lock->lk_replay_owner = NULL;
539         /*
540         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
541         */
542         READ_BUF(28);
543         READ32(lock->lk_type);
544         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
545                 goto xdr_error;
546         READ32(lock->lk_reclaim);
547         READ64(lock->lk_offset);
548         READ64(lock->lk_length);
549         READ32(lock->lk_is_new);
550
551         if (lock->lk_is_new) {
552                 READ_BUF(36);
553                 READ32(lock->lk_new_open_seqid);
554                 READ32(lock->lk_new_open_stateid.si_generation);
555
556                 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
557                 READ32(lock->lk_new_lock_seqid);
558                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
559                 READ32(lock->lk_new_owner.len);
560                 READ_BUF(lock->lk_new_owner.len);
561                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
562         } else {
563                 READ_BUF(20);
564                 READ32(lock->lk_old_lock_stateid.si_generation);
565                 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
566                 READ32(lock->lk_old_lock_seqid);
567         }
568
569         DECODE_TAIL;
570 }
571
572 static __be32
573 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
574 {
575         DECODE_HEAD;
576                         
577         READ_BUF(32);
578         READ32(lockt->lt_type);
579         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
580                 goto xdr_error;
581         READ64(lockt->lt_offset);
582         READ64(lockt->lt_length);
583         COPYMEM(&lockt->lt_clientid, 8);
584         READ32(lockt->lt_owner.len);
585         READ_BUF(lockt->lt_owner.len);
586         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
587
588         DECODE_TAIL;
589 }
590
591 static __be32
592 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
593 {
594         DECODE_HEAD;
595
596         locku->lu_stateowner = NULL;
597         READ_BUF(24 + sizeof(stateid_t));
598         READ32(locku->lu_type);
599         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
600                 goto xdr_error;
601         READ32(locku->lu_seqid);
602         READ32(locku->lu_stateid.si_generation);
603         COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
604         READ64(locku->lu_offset);
605         READ64(locku->lu_length);
606
607         DECODE_TAIL;
608 }
609
610 static __be32
611 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
612 {
613         DECODE_HEAD;
614
615         READ_BUF(4);
616         READ32(lookup->lo_len);
617         READ_BUF(lookup->lo_len);
618         SAVEMEM(lookup->lo_name, lookup->lo_len);
619         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
620                 return status;
621
622         DECODE_TAIL;
623 }
624
625 static __be32
626 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
627 {
628         DECODE_HEAD;
629
630         memset(open->op_bmval, 0, sizeof(open->op_bmval));
631         open->op_iattr.ia_valid = 0;
632         open->op_stateowner = NULL;
633
634         /* seqid, share_access, share_deny, clientid, ownerlen */
635         READ_BUF(16 + sizeof(clientid_t));
636         READ32(open->op_seqid);
637         READ32(open->op_share_access);
638         READ32(open->op_share_deny);
639         COPYMEM(&open->op_clientid, sizeof(clientid_t));
640         READ32(open->op_owner.len);
641
642         /* owner, open_flag */
643         READ_BUF(open->op_owner.len + 4);
644         SAVEMEM(open->op_owner.data, open->op_owner.len);
645         READ32(open->op_create);
646         switch (open->op_create) {
647         case NFS4_OPEN_NOCREATE:
648                 break;
649         case NFS4_OPEN_CREATE:
650                 READ_BUF(4);
651                 READ32(open->op_createmode);
652                 switch (open->op_createmode) {
653                 case NFS4_CREATE_UNCHECKED:
654                 case NFS4_CREATE_GUARDED:
655                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
656                                 goto out;
657                         break;
658                 case NFS4_CREATE_EXCLUSIVE:
659                         READ_BUF(8);
660                         COPYMEM(open->op_verf.data, 8);
661                         break;
662                 default:
663                         goto xdr_error;
664                 }
665                 break;
666         default:
667                 goto xdr_error;
668         }
669
670         /* open_claim */
671         READ_BUF(4);
672         READ32(open->op_claim_type);
673         switch (open->op_claim_type) {
674         case NFS4_OPEN_CLAIM_NULL:
675         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
676                 READ_BUF(4);
677                 READ32(open->op_fname.len);
678                 READ_BUF(open->op_fname.len);
679                 SAVEMEM(open->op_fname.data, open->op_fname.len);
680                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
681                         return status;
682                 break;
683         case NFS4_OPEN_CLAIM_PREVIOUS:
684                 READ_BUF(4);
685                 READ32(open->op_delegate_type);
686                 break;
687         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
688                 READ_BUF(sizeof(stateid_t) + 4);
689                 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
690                 READ32(open->op_fname.len);
691                 READ_BUF(open->op_fname.len);
692                 SAVEMEM(open->op_fname.data, open->op_fname.len);
693                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
694                         return status;
695                 break;
696         default:
697                 goto xdr_error;
698         }
699
700         DECODE_TAIL;
701 }
702
703 static __be32
704 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
705 {
706         DECODE_HEAD;
707                     
708         open_conf->oc_stateowner = NULL;
709         READ_BUF(4 + sizeof(stateid_t));
710         READ32(open_conf->oc_req_stateid.si_generation);
711         COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
712         READ32(open_conf->oc_seqid);
713                                                         
714         DECODE_TAIL;
715 }
716
717 static __be32
718 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
719 {
720         DECODE_HEAD;
721                     
722         open_down->od_stateowner = NULL;
723         READ_BUF(12 + sizeof(stateid_t));
724         READ32(open_down->od_stateid.si_generation);
725         COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
726         READ32(open_down->od_seqid);
727         READ32(open_down->od_share_access);
728         READ32(open_down->od_share_deny);
729                                                         
730         DECODE_TAIL;
731 }
732
733 static __be32
734 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
735 {
736         DECODE_HEAD;
737
738         READ_BUF(4);
739         READ32(putfh->pf_fhlen);
740         if (putfh->pf_fhlen > NFS4_FHSIZE)
741                 goto xdr_error;
742         READ_BUF(putfh->pf_fhlen);
743         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
744
745         DECODE_TAIL;
746 }
747
748 static __be32
749 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
750 {
751         DECODE_HEAD;
752
753         READ_BUF(sizeof(stateid_t) + 12);
754         READ32(read->rd_stateid.si_generation);
755         COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
756         READ64(read->rd_offset);
757         READ32(read->rd_length);
758
759         DECODE_TAIL;
760 }
761
762 static __be32
763 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
764 {
765         DECODE_HEAD;
766
767         READ_BUF(24);
768         READ64(readdir->rd_cookie);
769         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
770         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
771         READ32(readdir->rd_maxcount);
772         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
773                 goto out;
774
775         DECODE_TAIL;
776 }
777
778 static __be32
779 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
780 {
781         DECODE_HEAD;
782
783         READ_BUF(4);
784         READ32(remove->rm_namelen);
785         READ_BUF(remove->rm_namelen);
786         SAVEMEM(remove->rm_name, remove->rm_namelen);
787         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
788                 return status;
789
790         DECODE_TAIL;
791 }
792
793 static __be32
794 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
795 {
796         DECODE_HEAD;
797
798         READ_BUF(4);
799         READ32(rename->rn_snamelen);
800         READ_BUF(rename->rn_snamelen + 4);
801         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
802         READ32(rename->rn_tnamelen);
803         READ_BUF(rename->rn_tnamelen);
804         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
805         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
806                 return status;
807         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
808                 return status;
809
810         DECODE_TAIL;
811 }
812
813 static __be32
814 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
815 {
816         DECODE_HEAD;
817
818         READ_BUF(sizeof(clientid_t));
819         COPYMEM(clientid, sizeof(clientid_t));
820
821         DECODE_TAIL;
822 }
823
824 static __be32
825 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
826 {
827         DECODE_HEAD;
828
829         READ_BUF(sizeof(stateid_t));
830         READ32(setattr->sa_stateid.si_generation);
831         COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
832         if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
833                 goto out;
834
835         DECODE_TAIL;
836 }
837
838 static __be32
839 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
840 {
841         DECODE_HEAD;
842
843         READ_BUF(12);
844         COPYMEM(setclientid->se_verf.data, 8);
845         READ32(setclientid->se_namelen);
846
847         READ_BUF(setclientid->se_namelen + 8);
848         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
849         READ32(setclientid->se_callback_prog);
850         READ32(setclientid->se_callback_netid_len);
851
852         READ_BUF(setclientid->se_callback_netid_len + 4);
853         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
854         READ32(setclientid->se_callback_addr_len);
855
856         READ_BUF(setclientid->se_callback_addr_len + 4);
857         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
858         READ32(setclientid->se_callback_ident);
859
860         DECODE_TAIL;
861 }
862
863 static __be32
864 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
865 {
866         DECODE_HEAD;
867
868         READ_BUF(8 + sizeof(nfs4_verifier));
869         COPYMEM(&scd_c->sc_clientid, 8);
870         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
871
872         DECODE_TAIL;
873 }
874
875 /* Also used for NVERIFY */
876 static __be32
877 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
878 {
879 #if 0
880         struct nfsd4_compoundargs save = {
881                 .p = argp->p,
882                 .end = argp->end,
883                 .rqstp = argp->rqstp,
884         };
885         u32             ve_bmval[2];
886         struct iattr    ve_iattr;           /* request */
887         struct nfs4_acl *ve_acl;            /* request */
888 #endif
889         DECODE_HEAD;
890
891         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
892                 goto out;
893
894         /* For convenience's sake, we compare raw xdr'd attributes in
895          * nfsd4_proc_verify; however we still decode here just to return
896          * correct error in case of bad xdr. */
897 #if 0
898         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
899         if (status == nfserr_inval) {
900                 status = nfserrno(status);
901                 goto out;
902         }
903 #endif
904         READ_BUF(4);
905         READ32(verify->ve_attrlen);
906         READ_BUF(verify->ve_attrlen);
907         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
908
909         DECODE_TAIL;
910 }
911
912 static __be32
913 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
914 {
915         int avail;
916         int v;
917         int len;
918         DECODE_HEAD;
919
920         READ_BUF(sizeof(stateid_opaque_t) + 20);
921         READ32(write->wr_stateid.si_generation);
922         COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
923         READ64(write->wr_offset);
924         READ32(write->wr_stable_how);
925         if (write->wr_stable_how > 2)
926                 goto xdr_error;
927         READ32(write->wr_buflen);
928
929         /* Sorry .. no magic macros for this.. *
930          * READ_BUF(write->wr_buflen);
931          * SAVEMEM(write->wr_buf, write->wr_buflen);
932          */
933         avail = (char*)argp->end - (char*)argp->p;
934         if (avail + argp->pagelen < write->wr_buflen) {
935                 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); 
936                 goto xdr_error;
937         }
938         argp->rqstp->rq_vec[0].iov_base = p;
939         argp->rqstp->rq_vec[0].iov_len = avail;
940         v = 0;
941         len = write->wr_buflen;
942         while (len > argp->rqstp->rq_vec[v].iov_len) {
943                 len -= argp->rqstp->rq_vec[v].iov_len;
944                 v++;
945                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
946                 argp->pagelist++;
947                 if (argp->pagelen >= PAGE_SIZE) {
948                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
949                         argp->pagelen -= PAGE_SIZE;
950                 } else {
951                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
952                         argp->pagelen -= len;
953                 }
954         }
955         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
956         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
957         argp->rqstp->rq_vec[v].iov_len = len;
958         write->wr_vlen = v+1;
959
960         DECODE_TAIL;
961 }
962
963 static __be32
964 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
965 {
966         DECODE_HEAD;
967
968         READ_BUF(12);
969         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
970         READ32(rlockowner->rl_owner.len);
971         READ_BUF(rlockowner->rl_owner.len);
972         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
973
974         DECODE_TAIL;
975 }
976
977 static __be32
978 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
979 {
980         DECODE_HEAD;
981         struct nfsd4_op *op;
982         int i;
983
984         /*
985          * XXX: According to spec, we should check the tag
986          * for UTF-8 compliance.  I'm postponing this for
987          * now because it seems that some clients do use
988          * binary tags.
989          */
990         READ_BUF(4);
991         READ32(argp->taglen);
992         READ_BUF(argp->taglen + 8);
993         SAVEMEM(argp->tag, argp->taglen);
994         READ32(argp->minorversion);
995         READ32(argp->opcnt);
996
997         if (argp->taglen > NFSD4_MAX_TAGLEN)
998                 goto xdr_error;
999         if (argp->opcnt > 100)
1000                 goto xdr_error;
1001
1002         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1003                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1004                 if (!argp->ops) {
1005                         argp->ops = argp->iops;
1006                         printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
1007                         goto xdr_error;
1008                 }
1009         }
1010
1011         for (i = 0; i < argp->opcnt; i++) {
1012                 op = &argp->ops[i];
1013                 op->replay = NULL;
1014
1015                 /*
1016                  * We can't use READ_BUF() here because we need to handle
1017                  * a missing opcode as an OP_WRITE + 1. So we need to check
1018                  * to see if we're truly at the end of our buffer or if there
1019                  * is another page we need to flip to.
1020                  */
1021
1022                 if (argp->p == argp->end) {
1023                         if (argp->pagelen < 4) {
1024                                 /* There isn't an opcode still on the wire */
1025                                 op->opnum = OP_WRITE + 1;
1026                                 op->status = nfserr_bad_xdr;
1027                                 argp->opcnt = i+1;
1028                                 break;
1029                         }
1030
1031                         /*
1032                          * False alarm. We just hit a page boundary, but there
1033                          * is still data available.  Move pointer across page
1034                          * boundary.  *snip from READ_BUF*
1035                          */
1036                         argp->p = page_address(argp->pagelist[0]);
1037                         argp->pagelist++;
1038                         if (argp->pagelen < PAGE_SIZE) {
1039                                 argp->end = p + (argp->pagelen>>2);
1040                                 argp->pagelen = 0;
1041                         } else {
1042                                 argp->end = p + (PAGE_SIZE>>2);
1043                                 argp->pagelen -= PAGE_SIZE;
1044                         }
1045                 }
1046                 op->opnum = ntohl(*argp->p++);
1047
1048                 switch (op->opnum) {
1049                 case 2: /* Reserved operation */
1050                         op->opnum = OP_ILLEGAL;
1051                         if (argp->minorversion == 0)
1052                                 op->status = nfserr_op_illegal;
1053                         else
1054                                 op->status = nfserr_minor_vers_mismatch;
1055                         break;
1056                 case OP_ACCESS:
1057                         op->status = nfsd4_decode_access(argp, &op->u.access);
1058                         break;
1059                 case OP_CLOSE:
1060                         op->status = nfsd4_decode_close(argp, &op->u.close);
1061                         break;
1062                 case OP_COMMIT:
1063                         op->status = nfsd4_decode_commit(argp, &op->u.commit);
1064                         break;
1065                 case OP_CREATE:
1066                         op->status = nfsd4_decode_create(argp, &op->u.create);
1067                         break;
1068                 case OP_DELEGRETURN:
1069                         op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1070                         break;
1071                 case OP_GETATTR:
1072                         op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1073                         break;
1074                 case OP_GETFH:
1075                         op->status = nfs_ok;
1076                         break;
1077                 case OP_LINK:
1078                         op->status = nfsd4_decode_link(argp, &op->u.link);
1079                         break;
1080                 case OP_LOCK:
1081                         op->status = nfsd4_decode_lock(argp, &op->u.lock);
1082                         break;
1083                 case OP_LOCKT:
1084                         op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1085                         break;
1086                 case OP_LOCKU:
1087                         op->status = nfsd4_decode_locku(argp, &op->u.locku);
1088                         break;
1089                 case OP_LOOKUP:
1090                         op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1091                         break;
1092                 case OP_LOOKUPP:
1093                         op->status = nfs_ok;
1094                         break;
1095                 case OP_NVERIFY:
1096                         op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1097                         break;
1098                 case OP_OPEN:
1099                         op->status = nfsd4_decode_open(argp, &op->u.open);
1100                         break;
1101                 case OP_OPEN_CONFIRM:
1102                         op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1103                         break;
1104                 case OP_OPEN_DOWNGRADE:
1105                         op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1106                         break;
1107                 case OP_PUTFH:
1108                         op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1109                         break;
1110                 case OP_PUTROOTFH:
1111                         op->status = nfs_ok;
1112                         break;
1113                 case OP_READ:
1114                         op->status = nfsd4_decode_read(argp, &op->u.read);
1115                         break;
1116                 case OP_READDIR:
1117                         op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1118                         break;
1119                 case OP_READLINK:
1120                         op->status = nfs_ok;
1121                         break;
1122                 case OP_REMOVE:
1123                         op->status = nfsd4_decode_remove(argp, &op->u.remove);
1124                         break;
1125                 case OP_RENAME:
1126                         op->status = nfsd4_decode_rename(argp, &op->u.rename);
1127                         break;
1128                 case OP_RESTOREFH:
1129                         op->status = nfs_ok;
1130                         break;
1131                 case OP_RENEW:
1132                         op->status = nfsd4_decode_renew(argp, &op->u.renew);
1133                         break;
1134                 case OP_SAVEFH:
1135                         op->status = nfs_ok;
1136                         break;
1137                 case OP_SETATTR:
1138                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1139                         break;
1140                 case OP_SETCLIENTID:
1141                         op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1142                         break;
1143                 case OP_SETCLIENTID_CONFIRM:
1144                         op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1145                         break;
1146                 case OP_VERIFY:
1147                         op->status = nfsd4_decode_verify(argp, &op->u.verify);
1148                         break;
1149                 case OP_WRITE:
1150                         op->status = nfsd4_decode_write(argp, &op->u.write);
1151                         break;
1152                 case OP_RELEASE_LOCKOWNER:
1153                         op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1154                         break;
1155                 default:
1156                         op->opnum = OP_ILLEGAL;
1157                         op->status = nfserr_op_illegal;
1158                         break;
1159                 }
1160
1161                 if (op->status) {
1162                         argp->opcnt = i+1;
1163                         break;
1164                 }
1165         }
1166
1167         DECODE_TAIL;
1168 }
1169 /*
1170  * END OF "GENERIC" DECODE ROUTINES.
1171  */
1172
1173 /*
1174  * START OF "GENERIC" ENCODE ROUTINES.
1175  *   These may look a little ugly since they are imported from a "generic"
1176  * set of XDR encode/decode routines which are intended to be shared by
1177  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1178  *
1179  * If the pain of reading these is too great, it should be a straightforward
1180  * task to translate them into Linux-specific versions which are more
1181  * consistent with the style used in NFSv2/v3...
1182  */
1183 #define ENCODE_HEAD              __be32 *p
1184
1185 #define WRITE32(n)               *p++ = htonl(n)
1186 #define WRITE64(n)               do {                           \
1187         *p++ = htonl((u32)((n) >> 32));                         \
1188         *p++ = htonl((u32)(n));                                 \
1189 } while (0)
1190 #define WRITEMEM(ptr,nbytes)     do {                           \
1191         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1192         memcpy(p, ptr, nbytes);                                 \
1193         p += XDR_QUADLEN(nbytes);                               \
1194 } while (0)
1195 #define WRITECINFO(c)           do {                            \
1196         *p++ = htonl(c.atomic);                                 \
1197         *p++ = htonl(c.before_ctime_sec);                               \
1198         *p++ = htonl(c.before_ctime_nsec);                              \
1199         *p++ = htonl(c.after_ctime_sec);                                \
1200         *p++ = htonl(c.after_ctime_nsec);                               \
1201 } while (0)
1202
1203 #define RESERVE_SPACE(nbytes)   do {                            \
1204         p = resp->p;                                            \
1205         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1206 } while (0)
1207 #define ADJUST_ARGS()           resp->p = p
1208
1209 /*
1210  * Header routine to setup seqid operation replay cache
1211  */
1212 #define ENCODE_SEQID_OP_HEAD                                    \
1213         __be32 *p;                                              \
1214         __be32 *save;                                           \
1215                                                                 \
1216         save = resp->p;
1217
1218 /*
1219  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1220  * is where sequence id's are incremented, and the replay cache is filled.
1221  * Note that we increment sequence id's here, at the last moment, so we're sure
1222  * we know whether the error to be returned is a sequence id mutating error.
1223  */
1224
1225 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1226         if (seqid_mutating_err(nfserr) && stateowner) {         \
1227                 stateowner->so_seqid++;                         \
1228                 stateowner->so_replay.rp_status = nfserr;       \
1229                 stateowner->so_replay.rp_buflen =               \
1230                           (((char *)(resp)->p - (char *)save)); \
1231                 memcpy(stateowner->so_replay.rp_buf, save,      \
1232                         stateowner->so_replay.rp_buflen);       \
1233         } } while (0);
1234
1235 /* Encode as an array of strings the string given with components
1236  * seperated @sep.
1237  */
1238 static __be32 nfsd4_encode_components(char sep, char *components,
1239                                    __be32 **pp, int *buflen)
1240 {
1241         __be32 *p = *pp;
1242         __be32 *countp = p;
1243         int strlen, count=0;
1244         char *str, *end;
1245
1246         dprintk("nfsd4_encode_components(%s)\n", components);
1247         if ((*buflen -= 4) < 0)
1248                 return nfserr_resource;
1249         WRITE32(0); /* We will fill this in with @count later */
1250         end = str = components;
1251         while (*end) {
1252                 for (; *end && (*end != sep); end++)
1253                         ; /* Point to end of component */
1254                 strlen = end - str;
1255                 if (strlen) {
1256                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1257                                 return nfserr_resource;
1258                         WRITE32(strlen);
1259                         WRITEMEM(str, strlen);
1260                         count++;
1261                 }
1262                 else
1263                         end++;
1264                 str = end;
1265         }
1266         *pp = p;
1267         p = countp;
1268         WRITE32(count);
1269         return 0;
1270 }
1271
1272 /*
1273  * encode a location element of a fs_locations structure
1274  */
1275 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1276                                     __be32 **pp, int *buflen)
1277 {
1278         __be32 status;
1279         __be32 *p = *pp;
1280
1281         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1282         if (status)
1283                 return status;
1284         status = nfsd4_encode_components('/', location->path, &p, buflen);
1285         if (status)
1286                 return status;
1287         *pp = p;
1288         return 0;
1289 }
1290
1291 /*
1292  * Return the path to an export point in the pseudo filesystem namespace
1293  * Returned string is safe to use as long as the caller holds a reference
1294  * to @exp.
1295  */
1296 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1297 {
1298         struct svc_fh tmp_fh;
1299         char *path, *rootpath;
1300
1301         fh_init(&tmp_fh, NFS4_FHSIZE);
1302         *stat = exp_pseudoroot(rqstp->rq_client, &tmp_fh, &rqstp->rq_chandle);
1303         if (*stat)
1304                 return NULL;
1305         rootpath = tmp_fh.fh_export->ex_path;
1306
1307         path = exp->ex_path;
1308
1309         if (strncmp(path, rootpath, strlen(rootpath))) {
1310                 printk("nfsd: fs_locations failed;"
1311                         "%s is not contained in %s\n", path, rootpath);
1312                 *stat = nfserr_notsupp;
1313                 return NULL;
1314         }
1315
1316         return path + strlen(rootpath);
1317 }
1318
1319 /*
1320  *  encode a fs_locations structure
1321  */
1322 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1323                                      struct svc_export *exp,
1324                                      __be32 **pp, int *buflen)
1325 {
1326         __be32 status;
1327         int i;
1328         __be32 *p = *pp;
1329         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1330         char *root = nfsd4_path(rqstp, exp, &status);
1331
1332         if (status)
1333                 return status;
1334         status = nfsd4_encode_components('/', root, &p, buflen);
1335         if (status)
1336                 return status;
1337         if ((*buflen -= 4) < 0)
1338                 return nfserr_resource;
1339         WRITE32(fslocs->locations_count);
1340         for (i=0; i<fslocs->locations_count; i++) {
1341                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1342                                                    &p, buflen);
1343                 if (status)
1344                         return status;
1345         }
1346         *pp = p;
1347         return 0;
1348 }
1349
1350 static u32 nfs4_ftypes[16] = {
1351         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1352         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1353         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1354         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1355 };
1356
1357 static __be32
1358 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1359                         __be32 **p, int *buflen)
1360 {
1361         int status;
1362
1363         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1364                 return nfserr_resource;
1365         if (whotype != NFS4_ACL_WHO_NAMED)
1366                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1367         else if (group)
1368                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1369         else
1370                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1371         if (status < 0)
1372                 return nfserrno(status);
1373         *p = xdr_encode_opaque(*p, NULL, status);
1374         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1375         BUG_ON(*buflen < 0);
1376         return 0;
1377 }
1378
1379 static inline __be32
1380 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1381 {
1382         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1383 }
1384
1385 static inline __be32
1386 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1387 {
1388         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1389 }
1390
1391 static inline __be32
1392 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1393                 __be32 **p, int *buflen)
1394 {
1395         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1396 }
1397
1398 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1399                               FATTR4_WORD0_RDATTR_ERROR)
1400 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1401
1402 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1403 {
1404         /* As per referral draft:  */
1405         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1406             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1407                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1408                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1409                         *rdattr_err = NFSERR_MOVED;
1410                 else
1411                         return nfserr_moved;
1412         }
1413         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1414         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1415         return 0;
1416 }
1417
1418 /*
1419  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1420  * ourselves.
1421  *
1422  * @countp is the buffer size in _words_; upon successful return this becomes
1423  * replaced with the number of words written.
1424  */
1425 __be32
1426 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1427                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1428                 struct svc_rqst *rqstp)
1429 {
1430         u32 bmval0 = bmval[0];
1431         u32 bmval1 = bmval[1];
1432         struct kstat stat;
1433         struct svc_fh tempfh;
1434         struct kstatfs statfs;
1435         int buflen = *countp << 2;
1436         __be32 *attrlenp;
1437         u32 dummy;
1438         u64 dummy64;
1439         u32 rdattr_err = 0;
1440         __be32 *p = buffer;
1441         __be32 status;
1442         int err;
1443         int aclsupport = 0;
1444         struct nfs4_acl *acl = NULL;
1445
1446         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1447         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1448         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1449
1450         if (exp->ex_fslocs.migrated) {
1451                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1452                 if (status)
1453                         goto out;
1454         }
1455
1456         err = vfs_getattr(exp->ex_mnt, dentry, &stat);
1457         if (err)
1458                 goto out_nfserr;
1459         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1460             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1461                        FATTR4_WORD1_SPACE_TOTAL))) {
1462                 err = vfs_statfs(dentry, &statfs);
1463                 if (err)
1464                         goto out_nfserr;
1465         }
1466         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1467                 fh_init(&tempfh, NFS4_FHSIZE);
1468                 status = fh_compose(&tempfh, exp, dentry, NULL);
1469                 if (status)
1470                         goto out;
1471                 fhp = &tempfh;
1472         }
1473         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1474                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1475                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1476                 aclsupport = (err == 0);
1477                 if (bmval0 & FATTR4_WORD0_ACL) {
1478                         if (err == -EOPNOTSUPP)
1479                                 bmval0 &= ~FATTR4_WORD0_ACL;
1480                         else if (err == -EINVAL) {
1481                                 status = nfserr_attrnotsupp;
1482                                 goto out;
1483                         } else if (err != 0)
1484                                 goto out_nfserr;
1485                 }
1486         }
1487         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1488                 if (exp->ex_fslocs.locations == NULL) {
1489                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1490                 }
1491         }
1492         if ((buflen -= 16) < 0)
1493                 goto out_resource;
1494
1495         WRITE32(2);
1496         WRITE32(bmval0);
1497         WRITE32(bmval1);
1498         attrlenp = p++;                /* to be backfilled later */
1499
1500         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1501                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1502                 if ((buflen -= 12) < 0)
1503                         goto out_resource;
1504                 if (!aclsupport)
1505                         word0 &= ~FATTR4_WORD0_ACL;
1506                 if (!exp->ex_fslocs.locations)
1507                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1508                 WRITE32(2);
1509                 WRITE32(word0);
1510                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1511         }
1512         if (bmval0 & FATTR4_WORD0_TYPE) {
1513                 if ((buflen -= 4) < 0)
1514                         goto out_resource;
1515                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1516                 if (dummy == NF4BAD)
1517                         goto out_serverfault;
1518                 WRITE32(dummy);
1519         }
1520         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1521                 if ((buflen -= 4) < 0)
1522                         goto out_resource;
1523                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1524                         WRITE32(NFS4_FH_PERSISTENT);
1525                 else
1526                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1527         }
1528         if (bmval0 & FATTR4_WORD0_CHANGE) {
1529                 /*
1530                  * Note: This _must_ be consistent with the scheme for writing
1531                  * change_info, so any changes made here must be reflected there
1532                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1533                  * macro above.)
1534                  */
1535                 if ((buflen -= 8) < 0)
1536                         goto out_resource;
1537                 WRITE32(stat.ctime.tv_sec);
1538                 WRITE32(stat.ctime.tv_nsec);
1539         }
1540         if (bmval0 & FATTR4_WORD0_SIZE) {
1541                 if ((buflen -= 8) < 0)
1542                         goto out_resource;
1543                 WRITE64(stat.size);
1544         }
1545         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1546                 if ((buflen -= 4) < 0)
1547                         goto out_resource;
1548                 WRITE32(1);
1549         }
1550         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1551                 if ((buflen -= 4) < 0)
1552                         goto out_resource;
1553                 WRITE32(1);
1554         }
1555         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1556                 if ((buflen -= 4) < 0)
1557                         goto out_resource;
1558                 WRITE32(0);
1559         }
1560         if (bmval0 & FATTR4_WORD0_FSID) {
1561                 if ((buflen -= 16) < 0)
1562                         goto out_resource;
1563                 if (exp->ex_fslocs.migrated) {
1564                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1565                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1566                 } else switch(fsid_source(fhp)) {
1567                 case FSIDSOURCE_FSID:
1568                         WRITE64((u64)exp->ex_fsid);
1569                         WRITE64((u64)0);
1570                         break;
1571                 case FSIDSOURCE_DEV:
1572                         WRITE32(0);
1573                         WRITE32(MAJOR(stat.dev));
1574                         WRITE32(0);
1575                         WRITE32(MINOR(stat.dev));
1576                         break;
1577                 case FSIDSOURCE_UUID:
1578                         WRITEMEM(exp->ex_uuid, 16);
1579                         break;
1580                 }
1581         }
1582         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1583                 if ((buflen -= 4) < 0)
1584                         goto out_resource;
1585                 WRITE32(0);
1586         }
1587         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1588                 if ((buflen -= 4) < 0)
1589                         goto out_resource;
1590                 WRITE32(NFSD_LEASE_TIME);
1591         }
1592         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1593                 if ((buflen -= 4) < 0)
1594                         goto out_resource;
1595                 WRITE32(rdattr_err);
1596         }
1597         if (bmval0 & FATTR4_WORD0_ACL) {
1598                 struct nfs4_ace *ace;
1599
1600                 if (acl == NULL) {
1601                         if ((buflen -= 4) < 0)
1602                                 goto out_resource;
1603
1604                         WRITE32(0);
1605                         goto out_acl;
1606                 }
1607                 if ((buflen -= 4) < 0)
1608                         goto out_resource;
1609                 WRITE32(acl->naces);
1610
1611                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1612                         if ((buflen -= 4*3) < 0)
1613                                 goto out_resource;
1614                         WRITE32(ace->type);
1615                         WRITE32(ace->flag);
1616                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1617                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1618                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1619                                 &p, &buflen);
1620                         if (status == nfserr_resource)
1621                                 goto out_resource;
1622                         if (status)
1623                                 goto out;
1624                 }
1625         }
1626 out_acl:
1627         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1628                 if ((buflen -= 4) < 0)
1629                         goto out_resource;
1630                 WRITE32(aclsupport ?
1631                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1632         }
1633         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1634                 if ((buflen -= 4) < 0)
1635                         goto out_resource;
1636                 WRITE32(1);
1637         }
1638         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1639                 if ((buflen -= 4) < 0)
1640                         goto out_resource;
1641                 WRITE32(1);
1642         }
1643         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1644                 if ((buflen -= 4) < 0)
1645                         goto out_resource;
1646                 WRITE32(1);
1647         }
1648         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1649                 if ((buflen -= 4) < 0)
1650                         goto out_resource;
1651                 WRITE32(1);
1652         }
1653         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1654                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1655                 if (buflen < 0)
1656                         goto out_resource;
1657                 WRITE32(fhp->fh_handle.fh_size);
1658                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1659         }
1660         if (bmval0 & FATTR4_WORD0_FILEID) {
1661                 if ((buflen -= 8) < 0)
1662                         goto out_resource;
1663                 WRITE64((u64) stat.ino);
1664         }
1665         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1666                 if ((buflen -= 8) < 0)
1667                         goto out_resource;
1668                 WRITE64((u64) statfs.f_ffree);
1669         }
1670         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1671                 if ((buflen -= 8) < 0)
1672                         goto out_resource;
1673                 WRITE64((u64) statfs.f_ffree);
1674         }
1675         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1676                 if ((buflen -= 8) < 0)
1677                         goto out_resource;
1678                 WRITE64((u64) statfs.f_files);
1679         }
1680         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1681                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1682                 if (status == nfserr_resource)
1683                         goto out_resource;
1684                 if (status)
1685                         goto out;
1686         }
1687         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1688                 if ((buflen -= 4) < 0)
1689                         goto out_resource;
1690                 WRITE32(1);
1691         }
1692         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1693                 if ((buflen -= 8) < 0)
1694                         goto out_resource;
1695                 WRITE64(~(u64)0);
1696         }
1697         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1698                 if ((buflen -= 4) < 0)
1699                         goto out_resource;
1700                 WRITE32(255);
1701         }
1702         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1703                 if ((buflen -= 4) < 0)
1704                         goto out_resource;
1705                 WRITE32(~(u32) 0);
1706         }
1707         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1708                 if ((buflen -= 8) < 0)
1709                         goto out_resource;
1710                 WRITE64((u64) svc_max_payload(rqstp));
1711         }
1712         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1713                 if ((buflen -= 8) < 0)
1714                         goto out_resource;
1715                 WRITE64((u64) svc_max_payload(rqstp));
1716         }
1717         if (bmval1 & FATTR4_WORD1_MODE) {
1718                 if ((buflen -= 4) < 0)
1719                         goto out_resource;
1720                 WRITE32(stat.mode & S_IALLUGO);
1721         }
1722         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1723                 if ((buflen -= 4) < 0)
1724                         goto out_resource;
1725                 WRITE32(1);
1726         }
1727         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1728                 if ((buflen -= 4) < 0)
1729                         goto out_resource;
1730                 WRITE32(stat.nlink);
1731         }
1732         if (bmval1 & FATTR4_WORD1_OWNER) {
1733                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1734                 if (status == nfserr_resource)
1735                         goto out_resource;
1736                 if (status)
1737                         goto out;
1738         }
1739         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1740                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1741                 if (status == nfserr_resource)
1742                         goto out_resource;
1743                 if (status)
1744                         goto out;
1745         }
1746         if (bmval1 & FATTR4_WORD1_RAWDEV) {
1747                 if ((buflen -= 8) < 0)
1748                         goto out_resource;
1749                 WRITE32((u32) MAJOR(stat.rdev));
1750                 WRITE32((u32) MINOR(stat.rdev));
1751         }
1752         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1753                 if ((buflen -= 8) < 0)
1754                         goto out_resource;
1755                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1756                 WRITE64(dummy64);
1757         }
1758         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1759                 if ((buflen -= 8) < 0)
1760                         goto out_resource;
1761                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1762                 WRITE64(dummy64);
1763         }
1764         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1765                 if ((buflen -= 8) < 0)
1766                         goto out_resource;
1767                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1768                 WRITE64(dummy64);
1769         }
1770         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1771                 if ((buflen -= 8) < 0)
1772                         goto out_resource;
1773                 dummy64 = (u64)stat.blocks << 9;
1774                 WRITE64(dummy64);
1775         }
1776         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1777                 if ((buflen -= 12) < 0)
1778                         goto out_resource;
1779                 WRITE32(0);
1780                 WRITE32(stat.atime.tv_sec);
1781                 WRITE32(stat.atime.tv_nsec);
1782         }
1783         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1784                 if ((buflen -= 12) < 0)
1785                         goto out_resource;
1786                 WRITE32(0);
1787                 WRITE32(1);
1788                 WRITE32(0);
1789         }
1790         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1791                 if ((buflen -= 12) < 0)
1792                         goto out_resource;
1793                 WRITE32(0);
1794                 WRITE32(stat.ctime.tv_sec);
1795                 WRITE32(stat.ctime.tv_nsec);
1796         }
1797         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1798                 if ((buflen -= 12) < 0)
1799                         goto out_resource;
1800                 WRITE32(0);
1801                 WRITE32(stat.mtime.tv_sec);
1802                 WRITE32(stat.mtime.tv_nsec);
1803         }
1804         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1805                 struct dentry *mnt_pnt, *mnt_root;
1806
1807                 if ((buflen -= 8) < 0)
1808                         goto out_resource;
1809                 mnt_root = exp->ex_mnt->mnt_root;
1810                 if (mnt_root->d_inode == dentry->d_inode) {
1811                         mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1812                         WRITE64((u64) mnt_pnt->d_inode->i_ino);
1813                 } else
1814                         WRITE64((u64) stat.ino);
1815         }
1816         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1817         *countp = p - buffer;
1818         status = nfs_ok;
1819
1820 out:
1821         kfree(acl);
1822         if (fhp == &tempfh)
1823                 fh_put(&tempfh);
1824         return status;
1825 out_nfserr:
1826         status = nfserrno(err);
1827         goto out;
1828 out_resource:
1829         *countp = 0;
1830         status = nfserr_resource;
1831         goto out;
1832 out_serverfault:
1833         status = nfserr_serverfault;
1834         goto out;
1835 }
1836
1837 static __be32
1838 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1839                 const char *name, int namlen, __be32 *p, int *buflen)
1840 {
1841         struct svc_export *exp = cd->rd_fhp->fh_export;
1842         struct dentry *dentry;
1843         __be32 nfserr;
1844
1845         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1846         if (IS_ERR(dentry))
1847                 return nfserrno(PTR_ERR(dentry));
1848
1849         exp_get(exp);
1850         if (d_mountpoint(dentry)) {
1851                 int err;
1852
1853                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1854                 if (err) {
1855                         nfserr = nfserrno(err);
1856                         goto out_put;
1857                 }
1858
1859         }
1860         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1861                                         cd->rd_rqstp);
1862 out_put:
1863         dput(dentry);
1864         exp_put(exp);
1865         return nfserr;
1866 }
1867
1868 static __be32 *
1869 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1870 {
1871         __be32 *attrlenp;
1872
1873         if (buflen < 6)
1874                 return NULL;
1875         *p++ = htonl(2);
1876         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1877         *p++ = htonl(0);                         /* bmval1 */
1878
1879         attrlenp = p++;
1880         *p++ = nfserr;       /* no htonl */
1881         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1882         return p;
1883 }
1884
1885 static int
1886 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1887                     loff_t offset, u64 ino, unsigned int d_type)
1888 {
1889         struct readdir_cd *ccd = ccdv;
1890         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1891         int buflen;
1892         __be32 *p = cd->buffer;
1893         __be32 nfserr = nfserr_toosmall;
1894
1895         /* In nfsv4, "." and ".." never make it onto the wire.. */
1896         if (name && isdotent(name, namlen)) {
1897                 cd->common.err = nfs_ok;
1898                 return 0;
1899         }
1900
1901         if (cd->offset)
1902                 xdr_encode_hyper(cd->offset, (u64) offset);
1903
1904         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1905         if (buflen < 0)
1906                 goto fail;
1907
1908         *p++ = xdr_one;                             /* mark entry present */
1909         cd->offset = p;                             /* remember pointer */
1910         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
1911         p = xdr_encode_array(p, name, namlen);      /* name length & name */
1912
1913         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1914         switch (nfserr) {
1915         case nfs_ok:
1916                 p += buflen;
1917                 break;
1918         case nfserr_resource:
1919                 nfserr = nfserr_toosmall;
1920                 goto fail;
1921         case nfserr_dropit:
1922                 goto fail;
1923         default:
1924                 /*
1925                  * If the client requested the RDATTR_ERROR attribute,
1926                  * we stuff the error code into this attribute
1927                  * and continue.  If this attribute was not requested,
1928                  * then in accordance with the spec, we fail the
1929                  * entire READDIR operation(!)
1930                  */
1931                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1932                         goto fail;
1933                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1934                 if (p == NULL) {
1935                         nfserr = nfserr_toosmall;
1936                         goto fail;
1937                 }
1938         }
1939         cd->buflen -= (p - cd->buffer);
1940         cd->buffer = p;
1941         cd->common.err = nfs_ok;
1942         return 0;
1943 fail:
1944         cd->common.err = nfserr;
1945         return -EINVAL;
1946 }
1947
1948 static void
1949 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1950 {
1951         ENCODE_HEAD;
1952
1953         if (!nfserr) {
1954                 RESERVE_SPACE(8);
1955                 WRITE32(access->ac_supported);
1956                 WRITE32(access->ac_resp_access);
1957                 ADJUST_ARGS();
1958         }
1959 }
1960
1961 static void
1962 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1963 {
1964         ENCODE_SEQID_OP_HEAD;
1965
1966         if (!nfserr) {
1967                 RESERVE_SPACE(sizeof(stateid_t));
1968                 WRITE32(close->cl_stateid.si_generation);
1969                 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1970                 ADJUST_ARGS();
1971         }
1972         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1973 }
1974
1975
1976 static void
1977 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1978 {
1979         ENCODE_HEAD;
1980
1981         if (!nfserr) {
1982                 RESERVE_SPACE(8);
1983                 WRITEMEM(commit->co_verf.data, 8);
1984                 ADJUST_ARGS();
1985         }
1986 }
1987
1988 static void
1989 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
1990 {
1991         ENCODE_HEAD;
1992
1993         if (!nfserr) {
1994                 RESERVE_SPACE(32);
1995                 WRITECINFO(create->cr_cinfo);
1996                 WRITE32(2);
1997                 WRITE32(create->cr_bmval[0]);
1998                 WRITE32(create->cr_bmval[1]);
1999                 ADJUST_ARGS();
2000         }
2001 }
2002
2003 static __be32
2004 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2005 {
2006         struct svc_fh *fhp = getattr->ga_fhp;
2007         int buflen;
2008
2009         if (nfserr)
2010                 return nfserr;
2011
2012         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2013         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2014                                     resp->p, &buflen, getattr->ga_bmval,
2015                                     resp->rqstp);
2016         if (!nfserr)
2017                 resp->p += buflen;
2018         return nfserr;
2019 }
2020
2021 static void
2022 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
2023 {
2024         unsigned int len;
2025         ENCODE_HEAD;
2026
2027         if (!nfserr) {
2028                 len = fhp->fh_handle.fh_size;
2029                 RESERVE_SPACE(len + 4);
2030                 WRITE32(len);
2031                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2032                 ADJUST_ARGS();
2033         }
2034 }
2035
2036 /*
2037 * Including all fields other than the name, a LOCK4denied structure requires
2038 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2039 */
2040 static void
2041 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2042 {
2043         ENCODE_HEAD;
2044
2045         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2046         WRITE64(ld->ld_start);
2047         WRITE64(ld->ld_length);
2048         WRITE32(ld->ld_type);
2049         if (ld->ld_sop) {
2050                 WRITEMEM(&ld->ld_clientid, 8);
2051                 WRITE32(ld->ld_sop->so_owner.len);
2052                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2053                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2054         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2055                 WRITE64((u64)0); /* clientid */
2056                 WRITE32(0); /* length of owner name */
2057         }
2058         ADJUST_ARGS();
2059 }
2060
2061 static void
2062 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2063 {
2064         ENCODE_SEQID_OP_HEAD;
2065
2066         if (!nfserr) {
2067                 RESERVE_SPACE(4 + sizeof(stateid_t));
2068                 WRITE32(lock->lk_resp_stateid.si_generation);
2069                 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2070                 ADJUST_ARGS();
2071         } else if (nfserr == nfserr_denied)
2072                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2073
2074         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2075 }
2076
2077 static void
2078 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2079 {
2080         if (nfserr == nfserr_denied)
2081                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2082 }
2083
2084 static void
2085 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2086 {
2087         ENCODE_SEQID_OP_HEAD;
2088
2089         if (!nfserr) {
2090                 RESERVE_SPACE(sizeof(stateid_t));
2091                 WRITE32(locku->lu_stateid.si_generation);
2092                 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2093                 ADJUST_ARGS();
2094         }
2095                                         
2096         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2097 }
2098
2099
2100 static void
2101 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2102 {
2103         ENCODE_HEAD;
2104
2105         if (!nfserr) {
2106                 RESERVE_SPACE(20);
2107                 WRITECINFO(link->li_cinfo);
2108                 ADJUST_ARGS();
2109         }
2110 }
2111
2112
2113 static void
2114 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2115 {
2116         ENCODE_SEQID_OP_HEAD;
2117
2118         if (nfserr)
2119                 goto out;
2120
2121         RESERVE_SPACE(36 + sizeof(stateid_t));
2122         WRITE32(open->op_stateid.si_generation);
2123         WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2124         WRITECINFO(open->op_cinfo);
2125         WRITE32(open->op_rflags);
2126         WRITE32(2);
2127         WRITE32(open->op_bmval[0]);
2128         WRITE32(open->op_bmval[1]);
2129         WRITE32(open->op_delegate_type);
2130         ADJUST_ARGS();
2131
2132         switch (open->op_delegate_type) {
2133         case NFS4_OPEN_DELEGATE_NONE:
2134                 break;
2135         case NFS4_OPEN_DELEGATE_READ:
2136                 RESERVE_SPACE(20 + sizeof(stateid_t));
2137                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2138                 WRITE32(open->op_recall);
2139
2140                 /*
2141                  * TODO: ACE's in delegations
2142                  */
2143                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2144                 WRITE32(0);
2145                 WRITE32(0);
2146                 WRITE32(0);   /* XXX: is NULL principal ok? */
2147                 ADJUST_ARGS();
2148                 break;
2149         case NFS4_OPEN_DELEGATE_WRITE:
2150                 RESERVE_SPACE(32 + sizeof(stateid_t));
2151                 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2152                 WRITE32(0);
2153
2154                 /*
2155                  * TODO: space_limit's in delegations
2156                  */
2157                 WRITE32(NFS4_LIMIT_SIZE);
2158                 WRITE32(~(u32)0);
2159                 WRITE32(~(u32)0);
2160
2161                 /*
2162                  * TODO: ACE's in delegations
2163                  */
2164                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2165                 WRITE32(0);
2166                 WRITE32(0);
2167                 WRITE32(0);   /* XXX: is NULL principal ok? */
2168                 ADJUST_ARGS();
2169                 break;
2170         default:
2171                 BUG();
2172         }
2173         /* XXX save filehandle here */
2174 out:
2175         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2176 }
2177
2178 static void
2179 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2180 {
2181         ENCODE_SEQID_OP_HEAD;
2182                                         
2183         if (!nfserr) {
2184                 RESERVE_SPACE(sizeof(stateid_t));
2185                 WRITE32(oc->oc_resp_stateid.si_generation);
2186                 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2187                 ADJUST_ARGS();
2188         }
2189
2190         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2191 }
2192
2193 static void
2194 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2195 {
2196         ENCODE_SEQID_OP_HEAD;
2197                                         
2198         if (!nfserr) {
2199                 RESERVE_SPACE(sizeof(stateid_t));
2200                 WRITE32(od->od_stateid.si_generation);
2201                 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2202                 ADJUST_ARGS();
2203         }
2204
2205         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2206 }
2207
2208 static __be32
2209 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2210                   struct nfsd4_read *read)
2211 {
2212         u32 eof;
2213         int v, pn;
2214         unsigned long maxcount; 
2215         long len;
2216         ENCODE_HEAD;
2217
2218         if (nfserr)
2219                 return nfserr;
2220         if (resp->xbuf->page_len)
2221                 return nfserr_resource;
2222
2223         RESERVE_SPACE(8); /* eof flag and byte count */
2224
2225         maxcount = svc_max_payload(resp->rqstp);
2226         if (maxcount > read->rd_length)
2227                 maxcount = read->rd_length;
2228
2229         len = maxcount;
2230         v = 0;
2231         while (len > 0) {
2232                 pn = resp->rqstp->rq_resused++;
2233                 resp->rqstp->rq_vec[v].iov_base =
2234                         page_address(resp->rqstp->rq_respages[pn]);
2235                 resp->rqstp->rq_vec[v].iov_len =
2236                         len < PAGE_SIZE ? len : PAGE_SIZE;
2237                 v++;
2238                 len -= PAGE_SIZE;
2239         }
2240         read->rd_vlen = v;
2241
2242         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2243                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2244                         &maxcount);
2245
2246         if (nfserr == nfserr_symlink)
2247                 nfserr = nfserr_inval;
2248         if (nfserr)
2249                 return nfserr;
2250         eof = (read->rd_offset + maxcount >=
2251                read->rd_fhp->fh_dentry->d_inode->i_size);
2252
2253         WRITE32(eof);
2254         WRITE32(maxcount);
2255         ADJUST_ARGS();
2256         resp->xbuf->head[0].iov_len = (char*)p
2257                                         - (char*)resp->xbuf->head[0].iov_base;
2258         resp->xbuf->page_len = maxcount;
2259
2260         /* Use rest of head for padding and remaining ops: */
2261         resp->xbuf->tail[0].iov_base = p;
2262         resp->xbuf->tail[0].iov_len = 0;
2263         if (maxcount&3) {
2264                 RESERVE_SPACE(4);
2265                 WRITE32(0);
2266                 resp->xbuf->tail[0].iov_base += maxcount&3;
2267                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2268                 ADJUST_ARGS();
2269         }
2270         return 0;
2271 }
2272
2273 static __be32
2274 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2275 {
2276         int maxcount;
2277         char *page;
2278         ENCODE_HEAD;
2279
2280         if (nfserr)
2281                 return nfserr;
2282         if (resp->xbuf->page_len)
2283                 return nfserr_resource;
2284
2285         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2286
2287         maxcount = PAGE_SIZE;
2288         RESERVE_SPACE(4);
2289
2290         /*
2291          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2292          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2293          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2294          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2295          */
2296         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2297         if (nfserr == nfserr_isdir)
2298                 return nfserr_inval;
2299         if (nfserr)
2300                 return nfserr;
2301
2302         WRITE32(maxcount);
2303         ADJUST_ARGS();
2304         resp->xbuf->head[0].iov_len = (char*)p
2305                                 - (char*)resp->xbuf->head[0].iov_base;
2306         resp->xbuf->page_len = maxcount;
2307
2308         /* Use rest of head for padding and remaining ops: */
2309         resp->xbuf->tail[0].iov_base = p;
2310         resp->xbuf->tail[0].iov_len = 0;
2311         if (maxcount&3) {
2312                 RESERVE_SPACE(4);
2313                 WRITE32(0);
2314                 resp->xbuf->tail[0].iov_base += maxcount&3;
2315                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2316                 ADJUST_ARGS();
2317         }
2318         return 0;
2319 }
2320
2321 static __be32
2322 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2323 {
2324         int maxcount;
2325         loff_t offset;
2326         __be32 *page, *savep, *tailbase;
2327         ENCODE_HEAD;
2328
2329         if (nfserr)
2330                 return nfserr;
2331         if (resp->xbuf->page_len)
2332                 return nfserr_resource;
2333
2334         RESERVE_SPACE(8);  /* verifier */
2335         savep = p;
2336
2337         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2338         WRITE32(0);
2339         WRITE32(0);
2340         ADJUST_ARGS();
2341         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2342         tailbase = p;
2343
2344         maxcount = PAGE_SIZE;
2345         if (maxcount > readdir->rd_maxcount)
2346                 maxcount = readdir->rd_maxcount;
2347
2348         /*
2349          * Convert from bytes to words, account for the two words already
2350          * written, make sure to leave two words at the end for the next
2351          * pointer and eof field.
2352          */
2353         maxcount = (maxcount >> 2) - 4;
2354         if (maxcount < 0) {
2355                 nfserr =  nfserr_toosmall;
2356                 goto err_no_verf;
2357         }
2358
2359         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2360         readdir->common.err = 0;
2361         readdir->buflen = maxcount;
2362         readdir->buffer = page;
2363         readdir->offset = NULL;
2364
2365         offset = readdir->rd_cookie;
2366         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2367                               &offset,
2368                               &readdir->common, nfsd4_encode_dirent);
2369         if (nfserr == nfs_ok &&
2370             readdir->common.err == nfserr_toosmall &&
2371             readdir->buffer == page) 
2372                 nfserr = nfserr_toosmall;
2373         if (nfserr == nfserr_symlink)
2374                 nfserr = nfserr_notdir;
2375         if (nfserr)
2376                 goto err_no_verf;
2377
2378         if (readdir->offset)
2379                 xdr_encode_hyper(readdir->offset, offset);
2380
2381         p = readdir->buffer;
2382         *p++ = 0;       /* no more entries */
2383         *p++ = htonl(readdir->common.err == nfserr_eof);
2384         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2385                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2386
2387         /* Use rest of head for padding and remaining ops: */
2388         resp->xbuf->tail[0].iov_base = tailbase;
2389         resp->xbuf->tail[0].iov_len = 0;
2390         resp->p = resp->xbuf->tail[0].iov_base;
2391         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2392
2393         return 0;
2394 err_no_verf:
2395         p = savep;
2396         ADJUST_ARGS();
2397         return nfserr;
2398 }
2399
2400 static void
2401 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2402 {
2403         ENCODE_HEAD;
2404
2405         if (!nfserr) {
2406                 RESERVE_SPACE(20);
2407                 WRITECINFO(remove->rm_cinfo);
2408                 ADJUST_ARGS();
2409         }
2410 }
2411
2412 static void
2413 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2414 {
2415         ENCODE_HEAD;
2416
2417         if (!nfserr) {
2418                 RESERVE_SPACE(40);
2419                 WRITECINFO(rename->rn_sinfo);
2420                 WRITECINFO(rename->rn_tinfo);
2421                 ADJUST_ARGS();
2422         }
2423 }
2424
2425 /*
2426  * The SETATTR encode routine is special -- it always encodes a bitmap,
2427  * regardless of the error status.
2428  */
2429 static void
2430 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2431 {
2432         ENCODE_HEAD;
2433
2434         RESERVE_SPACE(12);
2435         if (nfserr) {
2436                 WRITE32(2);
2437                 WRITE32(0);
2438                 WRITE32(0);
2439         }
2440         else {
2441                 WRITE32(2);
2442                 WRITE32(setattr->sa_bmval[0]);
2443                 WRITE32(setattr->sa_bmval[1]);
2444         }
2445         ADJUST_ARGS();
2446 }
2447
2448 static void
2449 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2450 {
2451         ENCODE_HEAD;
2452
2453         if (!nfserr) {
2454                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2455                 WRITEMEM(&scd->se_clientid, 8);
2456                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2457                 ADJUST_ARGS();
2458         }
2459         else if (nfserr == nfserr_clid_inuse) {
2460                 RESERVE_SPACE(8);
2461                 WRITE32(0);
2462                 WRITE32(0);
2463                 ADJUST_ARGS();
2464         }
2465 }
2466
2467 static void
2468 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2469 {
2470         ENCODE_HEAD;
2471
2472         if (!nfserr) {
2473                 RESERVE_SPACE(16);
2474                 WRITE32(write->wr_bytes_written);
2475                 WRITE32(write->wr_how_written);
2476                 WRITEMEM(write->wr_verifier.data, 8);
2477                 ADJUST_ARGS();
2478         }
2479 }
2480
2481 void
2482 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2483 {
2484         __be32 *statp;
2485         ENCODE_HEAD;
2486
2487         RESERVE_SPACE(8);
2488         WRITE32(op->opnum);
2489         statp = p++;    /* to be backfilled at the end */
2490         ADJUST_ARGS();
2491
2492         switch (op->opnum) {
2493         case OP_ACCESS:
2494                 nfsd4_encode_access(resp, op->status, &op->u.access);
2495                 break;
2496         case OP_CLOSE:
2497                 nfsd4_encode_close(resp, op->status, &op->u.close);
2498                 break;
2499         case OP_COMMIT:
2500                 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2501                 break;
2502         case OP_CREATE:
2503                 nfsd4_encode_create(resp, op->status, &op->u.create);
2504                 break;
2505         case OP_DELEGRETURN:
2506                 break;
2507         case OP_GETATTR:
2508                 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2509                 break;
2510         case OP_GETFH:
2511                 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2512                 break;
2513         case OP_LINK:
2514                 nfsd4_encode_link(resp, op->status, &op->u.link);
2515                 break;
2516         case OP_LOCK:
2517                 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2518                 break;
2519         case OP_LOCKT:
2520                 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2521                 break;
2522         case OP_LOCKU:
2523                 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2524                 break;
2525         case OP_LOOKUP:
2526                 break;
2527         case OP_LOOKUPP:
2528                 break;
2529         case OP_NVERIFY:
2530                 break;
2531         case OP_OPEN:
2532                 nfsd4_encode_open(resp, op->status, &op->u.open);
2533                 break;
2534         case OP_OPEN_CONFIRM:
2535                 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2536                 break;
2537         case OP_OPEN_DOWNGRADE:
2538                 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2539                 break;
2540         case OP_PUTFH:
2541                 break;
2542         case OP_PUTROOTFH:
2543                 break;
2544         case OP_READ:
2545                 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2546                 break;
2547         case OP_READDIR:
2548                 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2549                 break;
2550         case OP_READLINK:
2551                 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2552                 break;
2553         case OP_REMOVE:
2554                 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2555                 break;
2556         case OP_RENAME:
2557                 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2558                 break;
2559         case OP_RENEW:
2560                 break;
2561         case OP_RESTOREFH:
2562                 break;
2563         case OP_SAVEFH:
2564                 break;
2565         case OP_SETATTR:
2566                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2567                 break;
2568         case OP_SETCLIENTID:
2569                 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2570                 break;
2571         case OP_SETCLIENTID_CONFIRM:
2572                 break;
2573         case OP_VERIFY:
2574                 break;
2575         case OP_WRITE:
2576                 nfsd4_encode_write(resp, op->status, &op->u.write);
2577                 break;
2578         case OP_RELEASE_LOCKOWNER:
2579                 break;
2580         default:
2581                 break;
2582         }
2583
2584         /*
2585          * Note: We write the status directly, instead of using WRITE32(),
2586          * since it is already in network byte order.
2587          */
2588         *statp = op->status;
2589 }
2590
2591 /* 
2592  * Encode the reply stored in the stateowner reply cache 
2593  * 
2594  * XDR note: do not encode rp->rp_buflen: the buffer contains the
2595  * previously sent already encoded operation.
2596  *
2597  * called with nfs4_lock_state() held
2598  */
2599 void
2600 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2601 {
2602         ENCODE_HEAD;
2603         struct nfs4_replay *rp = op->replay;
2604
2605         BUG_ON(!rp);
2606
2607         RESERVE_SPACE(8);
2608         WRITE32(op->opnum);
2609         *p++ = rp->rp_status;  /* already xdr'ed */
2610         ADJUST_ARGS();
2611
2612         RESERVE_SPACE(rp->rp_buflen);
2613         WRITEMEM(rp->rp_buf, rp->rp_buflen);
2614         ADJUST_ARGS();
2615 }
2616
2617 /*
2618  * END OF "GENERIC" ENCODE ROUTINES.
2619  */
2620
2621 int
2622 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2623 {
2624         return xdr_ressize_check(rqstp, p);
2625 }
2626
2627 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2628 {
2629         if (args->ops != args->iops) {
2630                 kfree(args->ops);
2631                 args->ops = args->iops;
2632         }
2633         kfree(args->tmpp);
2634         args->tmpp = NULL;
2635         while (args->to_free) {
2636                 struct tmpbuf *tb = args->to_free;
2637                 args->to_free = tb->next;
2638                 tb->release(tb->buf);
2639                 kfree(tb);
2640         }
2641 }
2642
2643 int
2644 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2645 {
2646         __be32 status;
2647
2648         args->p = p;
2649         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2650         args->pagelist = rqstp->rq_arg.pages;
2651         args->pagelen = rqstp->rq_arg.page_len;
2652         args->tmpp = NULL;
2653         args->to_free = NULL;
2654         args->ops = args->iops;
2655         args->rqstp = rqstp;
2656
2657         status = nfsd4_decode_compound(args);
2658         if (status) {
2659                 nfsd4_release_compoundargs(args);
2660         }
2661         return !status;
2662 }
2663
2664 int
2665 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2666 {
2667         /*
2668          * All that remains is to write the tag and operation count...
2669          */
2670         struct kvec *iov;
2671         p = resp->tagp;
2672         *p++ = htonl(resp->taglen);
2673         memcpy(p, resp->tag, resp->taglen);
2674         p += XDR_QUADLEN(resp->taglen);
2675         *p++ = htonl(resp->opcnt);
2676
2677         if (rqstp->rq_res.page_len) 
2678                 iov = &rqstp->rq_res.tail[0];
2679         else
2680                 iov = &rqstp->rq_res.head[0];
2681         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2682         BUG_ON(iov->iov_len > PAGE_SIZE);
2683         return 1;
2684 }
2685
2686 /*
2687  * Local variables:
2688  *  c-basic-offset: 8
2689  * End:
2690  */