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