nfsd41: stateid handling
[linux-2.6.git] / fs / nfsd / nfs4xdr.c
1 /*
2  *  Server-side XDR for NFSv4
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  *
35  * TODO: Neil Brown made the following observation:  We currently
36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
37  * never release any of that until the request is complete.
38  * It would be good to calculate a new maximum response size while
39  * decoding the COMPOUND, and call svc_reserve with this number
40  * at the end of nfs4svc_decode_compoundargs.
41  */
42
43 #include <linux/param.h>
44 #include <linux/smp.h>
45 #include <linux/fs.h>
46 #include <linux/namei.h>
47 #include <linux/vfs.h>
48 #include <linux/utsname.h>
49 #include <linux/sunrpc/xdr.h>
50 #include <linux/sunrpc/svc.h>
51 #include <linux/sunrpc/clnt.h>
52 #include <linux/nfsd/nfsd.h>
53 #include <linux/nfsd/state.h>
54 #include <linux/nfsd/xdr4.h>
55 #include <linux/nfsd_idmap.h>
56 #include <linux/nfs4.h>
57 #include <linux/nfs4_acl.h>
58 #include <linux/sunrpc/gss_api.h>
59 #include <linux/sunrpc/svcauth_gss.h>
60
61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
62
63 /*
64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
65  * directory in order to indicate to the client that a filesystem boundary is present
66  * We use a fixed fsid for a referral
67  */
68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
70
71 static __be32
72 check_filename(char *str, int len, __be32 err)
73 {
74         int i;
75
76         if (len == 0)
77                 return nfserr_inval;
78         if (isdotent(str, len))
79                 return err;
80         for (i = 0; i < len; i++)
81                 if (str[i] == '/')
82                         return err;
83         return 0;
84 }
85
86 /*
87  * START OF "GENERIC" DECODE ROUTINES.
88  *   These may look a little ugly since they are imported from a "generic"
89  * set of XDR encode/decode routines which are intended to be shared by
90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
91  *
92  * If the pain of reading these is too great, it should be a straightforward
93  * task to translate them into Linux-specific versions which are more
94  * consistent with the style used in NFSv2/v3...
95  */
96 #define DECODE_HEAD                             \
97         __be32 *p;                              \
98         __be32 status
99 #define DECODE_TAIL                             \
100         status = 0;                             \
101 out:                                            \
102         return status;                          \
103 xdr_error:                                      \
104         dprintk("NFSD: xdr error (%s:%d)\n",    \
105                         __FILE__, __LINE__);    \
106         status = nfserr_bad_xdr;                \
107         goto out
108
109 #define READ32(x)         (x) = ntohl(*p++)
110 #define READ64(x)         do {                  \
111         (x) = (u64)ntohl(*p++) << 32;           \
112         (x) |= ntohl(*p++);                     \
113 } while (0)
114 #define READTIME(x)       do {                  \
115         p++;                                    \
116         (x) = ntohl(*p++);                      \
117         p++;                                    \
118 } while (0)
119 #define READMEM(x,nbytes) do {                  \
120         x = (char *)p;                          \
121         p += XDR_QUADLEN(nbytes);               \
122 } while (0)
123 #define SAVEMEM(x,nbytes) do {                  \
124         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
125                 savemem(argp, p, nbytes) :      \
126                 (char *)p)) {                   \
127                 dprintk("NFSD: xdr error (%s:%d)\n", \
128                                 __FILE__, __LINE__); \
129                 goto xdr_error;                 \
130                 }                               \
131         p += XDR_QUADLEN(nbytes);               \
132 } while (0)
133 #define COPYMEM(x,nbytes) do {                  \
134         memcpy((x), p, nbytes);                 \
135         p += XDR_QUADLEN(nbytes);               \
136 } while (0)
137
138 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
139 #define READ_BUF(nbytes)  do {                  \
140         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
141                 p = argp->p;                    \
142                 argp->p += XDR_QUADLEN(nbytes); \
143         } else if (!(p = read_buf(argp, nbytes))) { \
144                 dprintk("NFSD: xdr error (%s:%d)\n", \
145                                 __FILE__, __LINE__); \
146                 goto xdr_error;                 \
147         }                                       \
148 } while (0)
149
150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
151 {
152         /* We want more bytes than seem to be available.
153          * Maybe we need a new page, maybe we have just run out
154          */
155         unsigned int avail = (char *)argp->end - (char *)argp->p;
156         __be32 *p;
157         if (avail + argp->pagelen < nbytes)
158                 return NULL;
159         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
160                 return NULL;
161         /* ok, we can do it with the current plus the next page */
162         if (nbytes <= sizeof(argp->tmp))
163                 p = argp->tmp;
164         else {
165                 kfree(argp->tmpp);
166                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
167                 if (!p)
168                         return NULL;
169                 
170         }
171         /*
172          * The following memcpy is safe because read_buf is always
173          * called with nbytes > avail, and the two cases above both
174          * guarantee p points to at least nbytes bytes.
175          */
176         memcpy(p, argp->p, avail);
177         /* step to next page */
178         argp->p = page_address(argp->pagelist[0]);
179         argp->pagelist++;
180         if (argp->pagelen < PAGE_SIZE) {
181                 argp->end = p + (argp->pagelen>>2);
182                 argp->pagelen = 0;
183         } else {
184                 argp->end = p + (PAGE_SIZE>>2);
185                 argp->pagelen -= PAGE_SIZE;
186         }
187         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
188         argp->p += XDR_QUADLEN(nbytes - avail);
189         return p;
190 }
191
192 static int
193 defer_free(struct nfsd4_compoundargs *argp,
194                 void (*release)(const void *), void *p)
195 {
196         struct tmpbuf *tb;
197
198         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
199         if (!tb)
200                 return -ENOMEM;
201         tb->buf = p;
202         tb->release = release;
203         tb->next = argp->to_free;
204         argp->to_free = tb;
205         return 0;
206 }
207
208 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
209 {
210         if (p == argp->tmp) {
211                 p = kmalloc(nbytes, GFP_KERNEL);
212                 if (!p)
213                         return NULL;
214                 memcpy(p, argp->tmp, nbytes);
215         } else {
216                 BUG_ON(p != argp->tmpp);
217                 argp->tmpp = NULL;
218         }
219         if (defer_free(argp, kfree, p)) {
220                 kfree(p);
221                 return NULL;
222         } else
223                 return (char *)p;
224 }
225
226 static __be32
227 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
228 {
229         u32 bmlen;
230         DECODE_HEAD;
231
232         bmval[0] = 0;
233         bmval[1] = 0;
234
235         READ_BUF(4);
236         READ32(bmlen);
237         if (bmlen > 1000)
238                 goto xdr_error;
239
240         READ_BUF(bmlen << 2);
241         if (bmlen > 0)
242                 READ32(bmval[0]);
243         if (bmlen > 1)
244                 READ32(bmval[1]);
245
246         DECODE_TAIL;
247 }
248
249 static __be32
250 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
251     struct nfs4_acl **acl)
252 {
253         int expected_len, len = 0;
254         u32 dummy32;
255         char *buf;
256         int host_err;
257
258         DECODE_HEAD;
259         iattr->ia_valid = 0;
260         if ((status = nfsd4_decode_bitmap(argp, bmval)))
261                 return status;
262
263         /*
264          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
265          * read-only attributes return ERR_INVAL.
266          */
267         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
268                 return nfserr_attrnotsupp;
269         if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
270                 return nfserr_inval;
271
272         READ_BUF(4);
273         READ32(expected_len);
274
275         if (bmval[0] & FATTR4_WORD0_SIZE) {
276                 READ_BUF(8);
277                 len += 8;
278                 READ64(iattr->ia_size);
279                 iattr->ia_valid |= ATTR_SIZE;
280         }
281         if (bmval[0] & FATTR4_WORD0_ACL) {
282                 int nace;
283                 struct nfs4_ace *ace;
284
285                 READ_BUF(4); len += 4;
286                 READ32(nace);
287
288                 if (nace > NFS4_ACL_MAX)
289                         return nfserr_resource;
290
291                 *acl = nfs4_acl_new(nace);
292                 if (*acl == NULL) {
293                         host_err = -ENOMEM;
294                         goto out_nfserr;
295                 }
296                 defer_free(argp, kfree, *acl);
297
298                 (*acl)->naces = nace;
299                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
300                         READ_BUF(16); len += 16;
301                         READ32(ace->type);
302                         READ32(ace->flag);
303                         READ32(ace->access_mask);
304                         READ32(dummy32);
305                         READ_BUF(dummy32);
306                         len += XDR_QUADLEN(dummy32) << 2;
307                         READMEM(buf, dummy32);
308                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
309                         host_err = 0;
310                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
311                                 ace->who = 0;
312                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
313                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
314                                                 buf, dummy32, &ace->who);
315                         else
316                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
317                                                 buf, dummy32, &ace->who);
318                         if (host_err)
319                                 goto out_nfserr;
320                 }
321         } else
322                 *acl = NULL;
323         if (bmval[1] & FATTR4_WORD1_MODE) {
324                 READ_BUF(4);
325                 len += 4;
326                 READ32(iattr->ia_mode);
327                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
328                 iattr->ia_valid |= ATTR_MODE;
329         }
330         if (bmval[1] & FATTR4_WORD1_OWNER) {
331                 READ_BUF(4);
332                 len += 4;
333                 READ32(dummy32);
334                 READ_BUF(dummy32);
335                 len += (XDR_QUADLEN(dummy32) << 2);
336                 READMEM(buf, dummy32);
337                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
338                         goto out_nfserr;
339                 iattr->ia_valid |= ATTR_UID;
340         }
341         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
342                 READ_BUF(4);
343                 len += 4;
344                 READ32(dummy32);
345                 READ_BUF(dummy32);
346                 len += (XDR_QUADLEN(dummy32) << 2);
347                 READMEM(buf, dummy32);
348                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
349                         goto out_nfserr;
350                 iattr->ia_valid |= ATTR_GID;
351         }
352         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
353                 READ_BUF(4);
354                 len += 4;
355                 READ32(dummy32);
356                 switch (dummy32) {
357                 case NFS4_SET_TO_CLIENT_TIME:
358                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
359                            all 32 bits of 'nseconds'. */
360                         READ_BUF(12);
361                         len += 12;
362                         READ32(dummy32);
363                         if (dummy32)
364                                 return nfserr_inval;
365                         READ32(iattr->ia_atime.tv_sec);
366                         READ32(iattr->ia_atime.tv_nsec);
367                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
368                                 return nfserr_inval;
369                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
370                         break;
371                 case NFS4_SET_TO_SERVER_TIME:
372                         iattr->ia_valid |= ATTR_ATIME;
373                         break;
374                 default:
375                         goto xdr_error;
376                 }
377         }
378         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
379                 READ_BUF(4);
380                 len += 4;
381                 READ32(dummy32);
382                 switch (dummy32) {
383                 case NFS4_SET_TO_CLIENT_TIME:
384                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
385                            all 32 bits of 'nseconds'. */
386                         READ_BUF(12);
387                         len += 12;
388                         READ32(dummy32);
389                         if (dummy32)
390                                 return nfserr_inval;
391                         READ32(iattr->ia_mtime.tv_sec);
392                         READ32(iattr->ia_mtime.tv_nsec);
393                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
394                                 return nfserr_inval;
395                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
396                         break;
397                 case NFS4_SET_TO_SERVER_TIME:
398                         iattr->ia_valid |= ATTR_MTIME;
399                         break;
400                 default:
401                         goto xdr_error;
402                 }
403         }
404         if (len != expected_len)
405                 goto xdr_error;
406
407         DECODE_TAIL;
408
409 out_nfserr:
410         status = nfserrno(host_err);
411         goto out;
412 }
413
414 static __be32
415 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
416 {
417         DECODE_HEAD;
418
419         READ_BUF(sizeof(stateid_t));
420         READ32(sid->si_generation);
421         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
422
423         DECODE_TAIL;
424 }
425
426 static __be32
427 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
428 {
429         DECODE_HEAD;
430
431         READ_BUF(4);
432         READ32(access->ac_req_access);
433
434         DECODE_TAIL;
435 }
436
437 static __be32
438 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
439 {
440         DECODE_HEAD;
441
442         close->cl_stateowner = NULL;
443         READ_BUF(4);
444         READ32(close->cl_seqid);
445         return nfsd4_decode_stateid(argp, &close->cl_stateid);
446
447         DECODE_TAIL;
448 }
449
450
451 static __be32
452 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
453 {
454         DECODE_HEAD;
455
456         READ_BUF(12);
457         READ64(commit->co_offset);
458         READ32(commit->co_count);
459
460         DECODE_TAIL;
461 }
462
463 static __be32
464 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
465 {
466         DECODE_HEAD;
467
468         READ_BUF(4);
469         READ32(create->cr_type);
470         switch (create->cr_type) {
471         case NF4LNK:
472                 READ_BUF(4);
473                 READ32(create->cr_linklen);
474                 READ_BUF(create->cr_linklen);
475                 SAVEMEM(create->cr_linkname, create->cr_linklen);
476                 break;
477         case NF4BLK:
478         case NF4CHR:
479                 READ_BUF(8);
480                 READ32(create->cr_specdata1);
481                 READ32(create->cr_specdata2);
482                 break;
483         case NF4SOCK:
484         case NF4FIFO:
485         case NF4DIR:
486         default:
487                 break;
488         }
489
490         READ_BUF(4);
491         READ32(create->cr_namelen);
492         READ_BUF(create->cr_namelen);
493         SAVEMEM(create->cr_name, create->cr_namelen);
494         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
495                 return status;
496
497         if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
498                 goto out;
499
500         DECODE_TAIL;
501 }
502
503 static inline __be32
504 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
505 {
506         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
507 }
508
509 static inline __be32
510 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
511 {
512         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
513 }
514
515 static __be32
516 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
517 {
518         DECODE_HEAD;
519
520         READ_BUF(4);
521         READ32(link->li_namelen);
522         READ_BUF(link->li_namelen);
523         SAVEMEM(link->li_name, link->li_namelen);
524         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
525                 return status;
526
527         DECODE_TAIL;
528 }
529
530 static __be32
531 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
532 {
533         DECODE_HEAD;
534
535         lock->lk_replay_owner = NULL;
536         /*
537         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
538         */
539         READ_BUF(28);
540         READ32(lock->lk_type);
541         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
542                 goto xdr_error;
543         READ32(lock->lk_reclaim);
544         READ64(lock->lk_offset);
545         READ64(lock->lk_length);
546         READ32(lock->lk_is_new);
547
548         if (lock->lk_is_new) {
549                 READ_BUF(4);
550                 READ32(lock->lk_new_open_seqid);
551                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
552                 if (status)
553                         return status;
554                 READ_BUF(8 + sizeof(clientid_t));
555                 READ32(lock->lk_new_lock_seqid);
556                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
557                 READ32(lock->lk_new_owner.len);
558                 READ_BUF(lock->lk_new_owner.len);
559                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
560         } else {
561                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
562                 if (status)
563                         return status;
564                 READ_BUF(4);
565                 READ32(lock->lk_old_lock_seqid);
566         }
567
568         DECODE_TAIL;
569 }
570
571 static __be32
572 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
573 {
574         DECODE_HEAD;
575                         
576         READ_BUF(32);
577         READ32(lockt->lt_type);
578         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
579                 goto xdr_error;
580         READ64(lockt->lt_offset);
581         READ64(lockt->lt_length);
582         COPYMEM(&lockt->lt_clientid, 8);
583         READ32(lockt->lt_owner.len);
584         READ_BUF(lockt->lt_owner.len);
585         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
586
587         DECODE_TAIL;
588 }
589
590 static __be32
591 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
592 {
593         DECODE_HEAD;
594
595         locku->lu_stateowner = NULL;
596         READ_BUF(8);
597         READ32(locku->lu_type);
598         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
599                 goto xdr_error;
600         READ32(locku->lu_seqid);
601         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
602         if (status)
603                 return status;
604         READ_BUF(16);
605         READ64(locku->lu_offset);
606         READ64(locku->lu_length);
607
608         DECODE_TAIL;
609 }
610
611 static __be32
612 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
613 {
614         DECODE_HEAD;
615
616         READ_BUF(4);
617         READ32(lookup->lo_len);
618         READ_BUF(lookup->lo_len);
619         SAVEMEM(lookup->lo_name, lookup->lo_len);
620         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
621                 return status;
622
623         DECODE_TAIL;
624 }
625
626 static __be32
627 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
628 {
629         DECODE_HEAD;
630
631         memset(open->op_bmval, 0, sizeof(open->op_bmval));
632         open->op_iattr.ia_valid = 0;
633         open->op_stateowner = NULL;
634
635         /* seqid, share_access, share_deny, clientid, ownerlen */
636         READ_BUF(16 + sizeof(clientid_t));
637         READ32(open->op_seqid);
638         READ32(open->op_share_access);
639         READ32(open->op_share_deny);
640         COPYMEM(&open->op_clientid, sizeof(clientid_t));
641         READ32(open->op_owner.len);
642
643         /* owner, open_flag */
644         READ_BUF(open->op_owner.len + 4);
645         SAVEMEM(open->op_owner.data, open->op_owner.len);
646         READ32(open->op_create);
647         switch (open->op_create) {
648         case NFS4_OPEN_NOCREATE:
649                 break;
650         case NFS4_OPEN_CREATE:
651                 READ_BUF(4);
652                 READ32(open->op_createmode);
653                 switch (open->op_createmode) {
654                 case NFS4_CREATE_UNCHECKED:
655                 case NFS4_CREATE_GUARDED:
656                         if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
657                                 goto out;
658                         break;
659                 case NFS4_CREATE_EXCLUSIVE:
660                         READ_BUF(8);
661                         COPYMEM(open->op_verf.data, 8);
662                         break;
663                 default:
664                         goto xdr_error;
665                 }
666                 break;
667         default:
668                 goto xdr_error;
669         }
670
671         /* open_claim */
672         READ_BUF(4);
673         READ32(open->op_claim_type);
674         switch (open->op_claim_type) {
675         case NFS4_OPEN_CLAIM_NULL:
676         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
677                 READ_BUF(4);
678                 READ32(open->op_fname.len);
679                 READ_BUF(open->op_fname.len);
680                 SAVEMEM(open->op_fname.data, open->op_fname.len);
681                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
682                         return status;
683                 break;
684         case NFS4_OPEN_CLAIM_PREVIOUS:
685                 READ_BUF(4);
686                 READ32(open->op_delegate_type);
687                 break;
688         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
689                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
690                 if (status)
691                         return status;
692                 READ_BUF(4);
693                 READ32(open->op_fname.len);
694                 READ_BUF(open->op_fname.len);
695                 SAVEMEM(open->op_fname.data, open->op_fname.len);
696                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
697                         return status;
698                 break;
699         default:
700                 goto xdr_error;
701         }
702
703         DECODE_TAIL;
704 }
705
706 static __be32
707 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
708 {
709         DECODE_HEAD;
710                     
711         open_conf->oc_stateowner = NULL;
712         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
713         if (status)
714                 return status;
715         READ_BUF(4);
716         READ32(open_conf->oc_seqid);
717                                                         
718         DECODE_TAIL;
719 }
720
721 static __be32
722 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
723 {
724         DECODE_HEAD;
725                     
726         open_down->od_stateowner = NULL;
727         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
728         if (status)
729                 return status;
730         READ_BUF(12);
731         READ32(open_down->od_seqid);
732         READ32(open_down->od_share_access);
733         READ32(open_down->od_share_deny);
734                                                         
735         DECODE_TAIL;
736 }
737
738 static __be32
739 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
740 {
741         DECODE_HEAD;
742
743         READ_BUF(4);
744         READ32(putfh->pf_fhlen);
745         if (putfh->pf_fhlen > NFS4_FHSIZE)
746                 goto xdr_error;
747         READ_BUF(putfh->pf_fhlen);
748         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
749
750         DECODE_TAIL;
751 }
752
753 static __be32
754 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
755 {
756         DECODE_HEAD;
757
758         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
759         if (status)
760                 return status;
761         READ_BUF(12);
762         READ64(read->rd_offset);
763         READ32(read->rd_length);
764
765         DECODE_TAIL;
766 }
767
768 static __be32
769 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
770 {
771         DECODE_HEAD;
772
773         READ_BUF(24);
774         READ64(readdir->rd_cookie);
775         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
776         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
777         READ32(readdir->rd_maxcount);
778         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
779                 goto out;
780
781         DECODE_TAIL;
782 }
783
784 static __be32
785 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
786 {
787         DECODE_HEAD;
788
789         READ_BUF(4);
790         READ32(remove->rm_namelen);
791         READ_BUF(remove->rm_namelen);
792         SAVEMEM(remove->rm_name, remove->rm_namelen);
793         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
794                 return status;
795
796         DECODE_TAIL;
797 }
798
799 static __be32
800 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
801 {
802         DECODE_HEAD;
803
804         READ_BUF(4);
805         READ32(rename->rn_snamelen);
806         READ_BUF(rename->rn_snamelen + 4);
807         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
808         READ32(rename->rn_tnamelen);
809         READ_BUF(rename->rn_tnamelen);
810         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
811         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
812                 return status;
813         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
814                 return status;
815
816         DECODE_TAIL;
817 }
818
819 static __be32
820 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
821 {
822         DECODE_HEAD;
823
824         READ_BUF(sizeof(clientid_t));
825         COPYMEM(clientid, sizeof(clientid_t));
826
827         DECODE_TAIL;
828 }
829
830 static __be32
831 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
832                      struct nfsd4_secinfo *secinfo)
833 {
834         DECODE_HEAD;
835
836         READ_BUF(4);
837         READ32(secinfo->si_namelen);
838         READ_BUF(secinfo->si_namelen);
839         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
840         status = check_filename(secinfo->si_name, secinfo->si_namelen,
841                                                                 nfserr_noent);
842         if (status)
843                 return status;
844         DECODE_TAIL;
845 }
846
847 static __be32
848 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
849 {
850         __be32 status;
851
852         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
853         if (status)
854                 return status;
855         return nfsd4_decode_fattr(argp, setattr->sa_bmval,
856                                   &setattr->sa_iattr, &setattr->sa_acl);
857 }
858
859 static __be32
860 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
861 {
862         DECODE_HEAD;
863
864         READ_BUF(12);
865         COPYMEM(setclientid->se_verf.data, 8);
866         READ32(setclientid->se_namelen);
867
868         READ_BUF(setclientid->se_namelen + 8);
869         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
870         READ32(setclientid->se_callback_prog);
871         READ32(setclientid->se_callback_netid_len);
872
873         READ_BUF(setclientid->se_callback_netid_len + 4);
874         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
875         READ32(setclientid->se_callback_addr_len);
876
877         READ_BUF(setclientid->se_callback_addr_len + 4);
878         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
879         READ32(setclientid->se_callback_ident);
880
881         DECODE_TAIL;
882 }
883
884 static __be32
885 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
886 {
887         DECODE_HEAD;
888
889         READ_BUF(8 + sizeof(nfs4_verifier));
890         COPYMEM(&scd_c->sc_clientid, 8);
891         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
892
893         DECODE_TAIL;
894 }
895
896 /* Also used for NVERIFY */
897 static __be32
898 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
899 {
900 #if 0
901         struct nfsd4_compoundargs save = {
902                 .p = argp->p,
903                 .end = argp->end,
904                 .rqstp = argp->rqstp,
905         };
906         u32             ve_bmval[2];
907         struct iattr    ve_iattr;           /* request */
908         struct nfs4_acl *ve_acl;            /* request */
909 #endif
910         DECODE_HEAD;
911
912         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
913                 goto out;
914
915         /* For convenience's sake, we compare raw xdr'd attributes in
916          * nfsd4_proc_verify; however we still decode here just to return
917          * correct error in case of bad xdr. */
918 #if 0
919         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
920         if (status == nfserr_inval) {
921                 status = nfserrno(status);
922                 goto out;
923         }
924 #endif
925         READ_BUF(4);
926         READ32(verify->ve_attrlen);
927         READ_BUF(verify->ve_attrlen);
928         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
929
930         DECODE_TAIL;
931 }
932
933 static __be32
934 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
935 {
936         int avail;
937         int v;
938         int len;
939         DECODE_HEAD;
940
941         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
942         if (status)
943                 return status;
944         READ_BUF(16);
945         READ64(write->wr_offset);
946         READ32(write->wr_stable_how);
947         if (write->wr_stable_how > 2)
948                 goto xdr_error;
949         READ32(write->wr_buflen);
950
951         /* Sorry .. no magic macros for this.. *
952          * READ_BUF(write->wr_buflen);
953          * SAVEMEM(write->wr_buf, write->wr_buflen);
954          */
955         avail = (char*)argp->end - (char*)argp->p;
956         if (avail + argp->pagelen < write->wr_buflen) {
957                 dprintk("NFSD: xdr error (%s:%d)\n",
958                                 __FILE__, __LINE__);
959                 goto xdr_error;
960         }
961         argp->rqstp->rq_vec[0].iov_base = p;
962         argp->rqstp->rq_vec[0].iov_len = avail;
963         v = 0;
964         len = write->wr_buflen;
965         while (len > argp->rqstp->rq_vec[v].iov_len) {
966                 len -= argp->rqstp->rq_vec[v].iov_len;
967                 v++;
968                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
969                 argp->pagelist++;
970                 if (argp->pagelen >= PAGE_SIZE) {
971                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
972                         argp->pagelen -= PAGE_SIZE;
973                 } else {
974                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
975                         argp->pagelen -= len;
976                 }
977         }
978         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
979         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
980         argp->rqstp->rq_vec[v].iov_len = len;
981         write->wr_vlen = v+1;
982
983         DECODE_TAIL;
984 }
985
986 static __be32
987 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
988 {
989         DECODE_HEAD;
990
991         READ_BUF(12);
992         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
993         READ32(rlockowner->rl_owner.len);
994         READ_BUF(rlockowner->rl_owner.len);
995         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
996
997         DECODE_TAIL;
998 }
999
1000 static __be32
1001 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1002                          struct nfsd4_exchange_id *exid)
1003 {
1004         int dummy;
1005         DECODE_HEAD;
1006
1007         READ_BUF(NFS4_VERIFIER_SIZE);
1008         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1009
1010         READ_BUF(4);
1011         READ32(exid->clname.len);
1012
1013         READ_BUF(exid->clname.len);
1014         SAVEMEM(exid->clname.data, exid->clname.len);
1015
1016         READ_BUF(4);
1017         READ32(exid->flags);
1018
1019         /* Ignore state_protect4_a */
1020         READ_BUF(4);
1021         READ32(exid->spa_how);
1022         switch (exid->spa_how) {
1023         case SP4_NONE:
1024                 break;
1025         case SP4_MACH_CRED:
1026                 /* spo_must_enforce */
1027                 READ_BUF(4);
1028                 READ32(dummy);
1029                 READ_BUF(dummy * 4);
1030                 p += dummy;
1031
1032                 /* spo_must_allow */
1033                 READ_BUF(4);
1034                 READ32(dummy);
1035                 READ_BUF(dummy * 4);
1036                 p += dummy;
1037                 break;
1038         case SP4_SSV:
1039                 /* ssp_ops */
1040                 READ_BUF(4);
1041                 READ32(dummy);
1042                 READ_BUF(dummy * 4);
1043                 p += dummy;
1044
1045                 READ_BUF(4);
1046                 READ32(dummy);
1047                 READ_BUF(dummy * 4);
1048                 p += dummy;
1049
1050                 /* ssp_hash_algs<> */
1051                 READ_BUF(4);
1052                 READ32(dummy);
1053                 READ_BUF(dummy);
1054                 p += XDR_QUADLEN(dummy);
1055
1056                 /* ssp_encr_algs<> */
1057                 READ_BUF(4);
1058                 READ32(dummy);
1059                 READ_BUF(dummy);
1060                 p += XDR_QUADLEN(dummy);
1061
1062                 /* ssp_window and ssp_num_gss_handles */
1063                 READ_BUF(8);
1064                 READ32(dummy);
1065                 READ32(dummy);
1066                 break;
1067         default:
1068                 goto xdr_error;
1069         }
1070
1071         /* Ignore Implementation ID */
1072         READ_BUF(4);    /* nfs_impl_id4 array length */
1073         READ32(dummy);
1074
1075         if (dummy > 1)
1076                 goto xdr_error;
1077
1078         if (dummy == 1) {
1079                 /* nii_domain */
1080                 READ_BUF(4);
1081                 READ32(dummy);
1082                 READ_BUF(dummy);
1083                 p += XDR_QUADLEN(dummy);
1084
1085                 /* nii_name */
1086                 READ_BUF(4);
1087                 READ32(dummy);
1088                 READ_BUF(dummy);
1089                 p += XDR_QUADLEN(dummy);
1090
1091                 /* nii_date */
1092                 READ_BUF(12);
1093                 p += 3;
1094         }
1095         DECODE_TAIL;
1096 }
1097
1098 static __be32
1099 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1100                             struct nfsd4_create_session *sess)
1101 {
1102         DECODE_HEAD;
1103
1104         u32 dummy;
1105         char *machine_name;
1106         int i;
1107         int nr_secflavs;
1108
1109         READ_BUF(16);
1110         COPYMEM(&sess->clientid, 8);
1111         READ32(sess->seqid);
1112         READ32(sess->flags);
1113
1114         /* Fore channel attrs */
1115         READ_BUF(28);
1116         READ32(dummy); /* headerpadsz is always 0 */
1117         READ32(sess->fore_channel.maxreq_sz);
1118         READ32(sess->fore_channel.maxresp_sz);
1119         READ32(sess->fore_channel.maxresp_cached);
1120         READ32(sess->fore_channel.maxops);
1121         READ32(sess->fore_channel.maxreqs);
1122         READ32(sess->fore_channel.nr_rdma_attrs);
1123         if (sess->fore_channel.nr_rdma_attrs == 1) {
1124                 READ_BUF(4);
1125                 READ32(sess->fore_channel.rdma_attrs);
1126         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1127                 dprintk("Too many fore channel attr bitmaps!\n");
1128                 goto xdr_error;
1129         }
1130
1131         /* Back channel attrs */
1132         READ_BUF(28);
1133         READ32(dummy); /* headerpadsz is always 0 */
1134         READ32(sess->back_channel.maxreq_sz);
1135         READ32(sess->back_channel.maxresp_sz);
1136         READ32(sess->back_channel.maxresp_cached);
1137         READ32(sess->back_channel.maxops);
1138         READ32(sess->back_channel.maxreqs);
1139         READ32(sess->back_channel.nr_rdma_attrs);
1140         if (sess->back_channel.nr_rdma_attrs == 1) {
1141                 READ_BUF(4);
1142                 READ32(sess->back_channel.rdma_attrs);
1143         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1144                 dprintk("Too many back channel attr bitmaps!\n");
1145                 goto xdr_error;
1146         }
1147
1148         READ_BUF(8);
1149         READ32(sess->callback_prog);
1150
1151         /* callback_sec_params4 */
1152         READ32(nr_secflavs);
1153         for (i = 0; i < nr_secflavs; ++i) {
1154                 READ_BUF(4);
1155                 READ32(dummy);
1156                 switch (dummy) {
1157                 case RPC_AUTH_NULL:
1158                         /* Nothing to read */
1159                         break;
1160                 case RPC_AUTH_UNIX:
1161                         READ_BUF(8);
1162                         /* stamp */
1163                         READ32(dummy);
1164
1165                         /* machine name */
1166                         READ32(dummy);
1167                         READ_BUF(dummy);
1168                         SAVEMEM(machine_name, dummy);
1169
1170                         /* uid, gid */
1171                         READ_BUF(8);
1172                         READ32(sess->uid);
1173                         READ32(sess->gid);
1174
1175                         /* more gids */
1176                         READ_BUF(4);
1177                         READ32(dummy);
1178                         READ_BUF(dummy * 4);
1179                         for (i = 0; i < dummy; ++i)
1180                                 READ32(dummy);
1181                         break;
1182                 case RPC_AUTH_GSS:
1183                         dprintk("RPC_AUTH_GSS callback secflavor "
1184                                 "not supported!\n");
1185                         READ_BUF(8);
1186                         /* gcbp_service */
1187                         READ32(dummy);
1188                         /* gcbp_handle_from_server */
1189                         READ32(dummy);
1190                         READ_BUF(dummy);
1191                         p += XDR_QUADLEN(dummy);
1192                         /* gcbp_handle_from_client */
1193                         READ_BUF(4);
1194                         READ32(dummy);
1195                         READ_BUF(dummy);
1196                         p += XDR_QUADLEN(dummy);
1197                         break;
1198                 default:
1199                         dprintk("Illegal callback secflavor\n");
1200                         return nfserr_inval;
1201                 }
1202         }
1203         DECODE_TAIL;
1204 }
1205
1206 static __be32
1207 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1208                              struct nfsd4_destroy_session *destroy_session)
1209 {
1210         DECODE_HEAD;
1211         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1212         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1213
1214         DECODE_TAIL;
1215 }
1216
1217 static __be32
1218 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1219                       struct nfsd4_sequence *seq)
1220 {
1221         DECODE_HEAD;
1222
1223         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1224         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1225         READ32(seq->seqid);
1226         READ32(seq->slotid);
1227         READ32(seq->maxslots);
1228         READ32(seq->cachethis);
1229
1230         DECODE_TAIL;
1231 }
1232
1233 static __be32
1234 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1235 {
1236         return nfs_ok;
1237 }
1238
1239 static __be32
1240 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1241 {
1242         return nfserr_notsupp;
1243 }
1244
1245 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1246
1247 static nfsd4_dec nfsd4_dec_ops[] = {
1248         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1249         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1250         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1251         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1252         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1253         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1254         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1255         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1256         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1257         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1258         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1259         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1260         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1261         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1262         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1263         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1264         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1265         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1266         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1267         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1268         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1269         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1270         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1271         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1272         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1273         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1274         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1275         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1276         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1277         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1278         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1279         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1280         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1281         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1282         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1283         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1284         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1285 };
1286
1287 static nfsd4_dec nfsd41_dec_ops[] = {
1288         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1289         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1290         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1291         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1292         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1293         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1294         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1295         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1296         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1297         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1298         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1299         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1300         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1301         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1302         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1303         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1304         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1305         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_notsupp,
1306         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1307         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1308         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1309         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1310         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1311         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1312         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1313         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1314         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1315         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_notsupp,
1316         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1317         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1318         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1319         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1320         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_notsupp,
1321         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
1322         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1323         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1324         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_notsupp,
1325
1326         /* new operations for NFSv4.1 */
1327         [OP_BACKCHANNEL_CTL]    (nfsd4_dec)nfsd4_decode_notsupp,
1328         [OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
1329         [OP_EXCHANGE_ID]        (nfsd4_dec)nfsd4_decode_exchange_id,
1330         [OP_CREATE_SESSION]     (nfsd4_dec)nfsd4_decode_create_session,
1331         [OP_DESTROY_SESSION]    (nfsd4_dec)nfsd4_decode_destroy_session,
1332         [OP_FREE_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1333         [OP_GET_DIR_DELEGATION] (nfsd4_dec)nfsd4_decode_notsupp,
1334         [OP_GETDEVICEINFO]      (nfsd4_dec)nfsd4_decode_notsupp,
1335         [OP_GETDEVICELIST]      (nfsd4_dec)nfsd4_decode_notsupp,
1336         [OP_LAYOUTCOMMIT]       (nfsd4_dec)nfsd4_decode_notsupp,
1337         [OP_LAYOUTGET]          (nfsd4_dec)nfsd4_decode_notsupp,
1338         [OP_LAYOUTRETURN]       (nfsd4_dec)nfsd4_decode_notsupp,
1339         [OP_SECINFO_NO_NAME]    (nfsd4_dec)nfsd4_decode_notsupp,
1340         [OP_SEQUENCE]           (nfsd4_dec)nfsd4_decode_sequence,
1341         [OP_SET_SSV]            (nfsd4_dec)nfsd4_decode_notsupp,
1342         [OP_TEST_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1343         [OP_WANT_DELEGATION]    (nfsd4_dec)nfsd4_decode_notsupp,
1344         [OP_DESTROY_CLIENTID]   (nfsd4_dec)nfsd4_decode_notsupp,
1345         [OP_RECLAIM_COMPLETE]   (nfsd4_dec)nfsd4_decode_notsupp,
1346 };
1347
1348 struct nfsd4_minorversion_ops {
1349         nfsd4_dec *decoders;
1350         int nops;
1351 };
1352
1353 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1354         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1355         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1356 };
1357
1358 static __be32
1359 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1360 {
1361         DECODE_HEAD;
1362         struct nfsd4_op *op;
1363         struct nfsd4_minorversion_ops *ops;
1364         int i;
1365
1366         /*
1367          * XXX: According to spec, we should check the tag
1368          * for UTF-8 compliance.  I'm postponing this for
1369          * now because it seems that some clients do use
1370          * binary tags.
1371          */
1372         READ_BUF(4);
1373         READ32(argp->taglen);
1374         READ_BUF(argp->taglen + 8);
1375         SAVEMEM(argp->tag, argp->taglen);
1376         READ32(argp->minorversion);
1377         READ32(argp->opcnt);
1378
1379         if (argp->taglen > NFSD4_MAX_TAGLEN)
1380                 goto xdr_error;
1381         if (argp->opcnt > 100)
1382                 goto xdr_error;
1383
1384         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1385                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1386                 if (!argp->ops) {
1387                         argp->ops = argp->iops;
1388                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1389                         goto xdr_error;
1390                 }
1391         }
1392
1393         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1394                 argp->opcnt = 0;
1395
1396         ops = &nfsd4_minorversion[argp->minorversion];
1397         for (i = 0; i < argp->opcnt; i++) {
1398                 op = &argp->ops[i];
1399                 op->replay = NULL;
1400
1401                 /*
1402                  * We can't use READ_BUF() here because we need to handle
1403                  * a missing opcode as an OP_WRITE + 1. So we need to check
1404                  * to see if we're truly at the end of our buffer or if there
1405                  * is another page we need to flip to.
1406                  */
1407
1408                 if (argp->p == argp->end) {
1409                         if (argp->pagelen < 4) {
1410                                 /* There isn't an opcode still on the wire */
1411                                 op->opnum = OP_WRITE + 1;
1412                                 op->status = nfserr_bad_xdr;
1413                                 argp->opcnt = i+1;
1414                                 break;
1415                         }
1416
1417                         /*
1418                          * False alarm. We just hit a page boundary, but there
1419                          * is still data available.  Move pointer across page
1420                          * boundary.  *snip from READ_BUF*
1421                          */
1422                         argp->p = page_address(argp->pagelist[0]);
1423                         argp->pagelist++;
1424                         if (argp->pagelen < PAGE_SIZE) {
1425                                 argp->end = p + (argp->pagelen>>2);
1426                                 argp->pagelen = 0;
1427                         } else {
1428                                 argp->end = p + (PAGE_SIZE>>2);
1429                                 argp->pagelen -= PAGE_SIZE;
1430                         }
1431                 }
1432                 op->opnum = ntohl(*argp->p++);
1433
1434                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1435                         op->status = ops->decoders[op->opnum](argp, &op->u);
1436                 else {
1437                         op->opnum = OP_ILLEGAL;
1438                         op->status = nfserr_op_illegal;
1439                 }
1440
1441                 if (op->status) {
1442                         argp->opcnt = i+1;
1443                         break;
1444                 }
1445         }
1446
1447         DECODE_TAIL;
1448 }
1449 /*
1450  * END OF "GENERIC" DECODE ROUTINES.
1451  */
1452
1453 /*
1454  * START OF "GENERIC" ENCODE ROUTINES.
1455  *   These may look a little ugly since they are imported from a "generic"
1456  * set of XDR encode/decode routines which are intended to be shared by
1457  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1458  *
1459  * If the pain of reading these is too great, it should be a straightforward
1460  * task to translate them into Linux-specific versions which are more
1461  * consistent with the style used in NFSv2/v3...
1462  */
1463 #define ENCODE_HEAD              __be32 *p
1464
1465 #define WRITE32(n)               *p++ = htonl(n)
1466 #define WRITE64(n)               do {                           \
1467         *p++ = htonl((u32)((n) >> 32));                         \
1468         *p++ = htonl((u32)(n));                                 \
1469 } while (0)
1470 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1471         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1472         memcpy(p, ptr, nbytes);                                 \
1473         p += XDR_QUADLEN(nbytes);                               \
1474 }} while (0)
1475 #define WRITECINFO(c)           do {                            \
1476         *p++ = htonl(c.atomic);                                 \
1477         *p++ = htonl(c.before_ctime_sec);                               \
1478         *p++ = htonl(c.before_ctime_nsec);                              \
1479         *p++ = htonl(c.after_ctime_sec);                                \
1480         *p++ = htonl(c.after_ctime_nsec);                               \
1481 } while (0)
1482
1483 #define RESERVE_SPACE(nbytes)   do {                            \
1484         p = resp->p;                                            \
1485         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1486 } while (0)
1487 #define ADJUST_ARGS()           resp->p = p
1488
1489 /*
1490  * Header routine to setup seqid operation replay cache
1491  */
1492 #define ENCODE_SEQID_OP_HEAD                                    \
1493         __be32 *save;                                           \
1494                                                                 \
1495         save = resp->p;
1496
1497 /*
1498  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1499  * is where sequence id's are incremented, and the replay cache is filled.
1500  * Note that we increment sequence id's here, at the last moment, so we're sure
1501  * we know whether the error to be returned is a sequence id mutating error.
1502  */
1503
1504 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1505         if (seqid_mutating_err(nfserr) && stateowner) {         \
1506                 stateowner->so_seqid++;                         \
1507                 stateowner->so_replay.rp_status = nfserr;       \
1508                 stateowner->so_replay.rp_buflen =               \
1509                           (((char *)(resp)->p - (char *)save)); \
1510                 memcpy(stateowner->so_replay.rp_buf, save,      \
1511                         stateowner->so_replay.rp_buflen);       \
1512         } } while (0);
1513
1514 /* Encode as an array of strings the string given with components
1515  * seperated @sep.
1516  */
1517 static __be32 nfsd4_encode_components(char sep, char *components,
1518                                    __be32 **pp, int *buflen)
1519 {
1520         __be32 *p = *pp;
1521         __be32 *countp = p;
1522         int strlen, count=0;
1523         char *str, *end;
1524
1525         dprintk("nfsd4_encode_components(%s)\n", components);
1526         if ((*buflen -= 4) < 0)
1527                 return nfserr_resource;
1528         WRITE32(0); /* We will fill this in with @count later */
1529         end = str = components;
1530         while (*end) {
1531                 for (; *end && (*end != sep); end++)
1532                         ; /* Point to end of component */
1533                 strlen = end - str;
1534                 if (strlen) {
1535                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1536                                 return nfserr_resource;
1537                         WRITE32(strlen);
1538                         WRITEMEM(str, strlen);
1539                         count++;
1540                 }
1541                 else
1542                         end++;
1543                 str = end;
1544         }
1545         *pp = p;
1546         p = countp;
1547         WRITE32(count);
1548         return 0;
1549 }
1550
1551 /*
1552  * encode a location element of a fs_locations structure
1553  */
1554 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1555                                     __be32 **pp, int *buflen)
1556 {
1557         __be32 status;
1558         __be32 *p = *pp;
1559
1560         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1561         if (status)
1562                 return status;
1563         status = nfsd4_encode_components('/', location->path, &p, buflen);
1564         if (status)
1565                 return status;
1566         *pp = p;
1567         return 0;
1568 }
1569
1570 /*
1571  * Return the path to an export point in the pseudo filesystem namespace
1572  * Returned string is safe to use as long as the caller holds a reference
1573  * to @exp.
1574  */
1575 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1576 {
1577         struct svc_fh tmp_fh;
1578         char *path, *rootpath;
1579
1580         fh_init(&tmp_fh, NFS4_FHSIZE);
1581         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1582         if (*stat)
1583                 return NULL;
1584         rootpath = tmp_fh.fh_export->ex_pathname;
1585
1586         path = exp->ex_pathname;
1587
1588         if (strncmp(path, rootpath, strlen(rootpath))) {
1589                 dprintk("nfsd: fs_locations failed;"
1590                         "%s is not contained in %s\n", path, rootpath);
1591                 *stat = nfserr_notsupp;
1592                 return NULL;
1593         }
1594
1595         return path + strlen(rootpath);
1596 }
1597
1598 /*
1599  *  encode a fs_locations structure
1600  */
1601 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1602                                      struct svc_export *exp,
1603                                      __be32 **pp, int *buflen)
1604 {
1605         __be32 status;
1606         int i;
1607         __be32 *p = *pp;
1608         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1609         char *root = nfsd4_path(rqstp, exp, &status);
1610
1611         if (status)
1612                 return status;
1613         status = nfsd4_encode_components('/', root, &p, buflen);
1614         if (status)
1615                 return status;
1616         if ((*buflen -= 4) < 0)
1617                 return nfserr_resource;
1618         WRITE32(fslocs->locations_count);
1619         for (i=0; i<fslocs->locations_count; i++) {
1620                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1621                                                    &p, buflen);
1622                 if (status)
1623                         return status;
1624         }
1625         *pp = p;
1626         return 0;
1627 }
1628
1629 static u32 nfs4_ftypes[16] = {
1630         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1631         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1632         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1633         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1634 };
1635
1636 static __be32
1637 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1638                         __be32 **p, int *buflen)
1639 {
1640         int status;
1641
1642         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1643                 return nfserr_resource;
1644         if (whotype != NFS4_ACL_WHO_NAMED)
1645                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1646         else if (group)
1647                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1648         else
1649                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1650         if (status < 0)
1651                 return nfserrno(status);
1652         *p = xdr_encode_opaque(*p, NULL, status);
1653         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1654         BUG_ON(*buflen < 0);
1655         return 0;
1656 }
1657
1658 static inline __be32
1659 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1660 {
1661         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1662 }
1663
1664 static inline __be32
1665 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1666 {
1667         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1668 }
1669
1670 static inline __be32
1671 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1672                 __be32 **p, int *buflen)
1673 {
1674         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1675 }
1676
1677 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1678                               FATTR4_WORD0_RDATTR_ERROR)
1679 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1680
1681 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1682 {
1683         /* As per referral draft:  */
1684         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1685             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1686                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1687                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1688                         *rdattr_err = NFSERR_MOVED;
1689                 else
1690                         return nfserr_moved;
1691         }
1692         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1693         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1694         return 0;
1695 }
1696
1697 /*
1698  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1699  * ourselves.
1700  *
1701  * @countp is the buffer size in _words_; upon successful return this becomes
1702  * replaced with the number of words written.
1703  */
1704 __be32
1705 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1706                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1707                 struct svc_rqst *rqstp, int ignore_crossmnt)
1708 {
1709         u32 bmval0 = bmval[0];
1710         u32 bmval1 = bmval[1];
1711         struct kstat stat;
1712         struct svc_fh tempfh;
1713         struct kstatfs statfs;
1714         int buflen = *countp << 2;
1715         __be32 *attrlenp;
1716         u32 dummy;
1717         u64 dummy64;
1718         u32 rdattr_err = 0;
1719         __be32 *p = buffer;
1720         __be32 status;
1721         int err;
1722         int aclsupport = 0;
1723         struct nfs4_acl *acl = NULL;
1724
1725         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1726         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1727         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1728
1729         if (exp->ex_fslocs.migrated) {
1730                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1731                 if (status)
1732                         goto out;
1733         }
1734
1735         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1736         if (err)
1737                 goto out_nfserr;
1738         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1739                         FATTR4_WORD0_MAXNAME)) ||
1740             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1741                        FATTR4_WORD1_SPACE_TOTAL))) {
1742                 err = vfs_statfs(dentry, &statfs);
1743                 if (err)
1744                         goto out_nfserr;
1745         }
1746         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1747                 fh_init(&tempfh, NFS4_FHSIZE);
1748                 status = fh_compose(&tempfh, exp, dentry, NULL);
1749                 if (status)
1750                         goto out;
1751                 fhp = &tempfh;
1752         }
1753         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1754                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1755                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1756                 aclsupport = (err == 0);
1757                 if (bmval0 & FATTR4_WORD0_ACL) {
1758                         if (err == -EOPNOTSUPP)
1759                                 bmval0 &= ~FATTR4_WORD0_ACL;
1760                         else if (err == -EINVAL) {
1761                                 status = nfserr_attrnotsupp;
1762                                 goto out;
1763                         } else if (err != 0)
1764                                 goto out_nfserr;
1765                 }
1766         }
1767         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1768                 if (exp->ex_fslocs.locations == NULL) {
1769                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1770                 }
1771         }
1772         if ((buflen -= 16) < 0)
1773                 goto out_resource;
1774
1775         WRITE32(2);
1776         WRITE32(bmval0);
1777         WRITE32(bmval1);
1778         attrlenp = p++;                /* to be backfilled later */
1779
1780         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1781                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1782                 if ((buflen -= 12) < 0)
1783                         goto out_resource;
1784                 if (!aclsupport)
1785                         word0 &= ~FATTR4_WORD0_ACL;
1786                 if (!exp->ex_fslocs.locations)
1787                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1788                 WRITE32(2);
1789                 WRITE32(word0);
1790                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1791         }
1792         if (bmval0 & FATTR4_WORD0_TYPE) {
1793                 if ((buflen -= 4) < 0)
1794                         goto out_resource;
1795                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1796                 if (dummy == NF4BAD)
1797                         goto out_serverfault;
1798                 WRITE32(dummy);
1799         }
1800         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1801                 if ((buflen -= 4) < 0)
1802                         goto out_resource;
1803                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1804                         WRITE32(NFS4_FH_PERSISTENT);
1805                 else
1806                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1807         }
1808         if (bmval0 & FATTR4_WORD0_CHANGE) {
1809                 /*
1810                  * Note: This _must_ be consistent with the scheme for writing
1811                  * change_info, so any changes made here must be reflected there
1812                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1813                  * macro above.)
1814                  */
1815                 if ((buflen -= 8) < 0)
1816                         goto out_resource;
1817                 WRITE32(stat.ctime.tv_sec);
1818                 WRITE32(stat.ctime.tv_nsec);
1819         }
1820         if (bmval0 & FATTR4_WORD0_SIZE) {
1821                 if ((buflen -= 8) < 0)
1822                         goto out_resource;
1823                 WRITE64(stat.size);
1824         }
1825         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1826                 if ((buflen -= 4) < 0)
1827                         goto out_resource;
1828                 WRITE32(1);
1829         }
1830         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1831                 if ((buflen -= 4) < 0)
1832                         goto out_resource;
1833                 WRITE32(1);
1834         }
1835         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1836                 if ((buflen -= 4) < 0)
1837                         goto out_resource;
1838                 WRITE32(0);
1839         }
1840         if (bmval0 & FATTR4_WORD0_FSID) {
1841                 if ((buflen -= 16) < 0)
1842                         goto out_resource;
1843                 if (exp->ex_fslocs.migrated) {
1844                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1845                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1846                 } else switch(fsid_source(fhp)) {
1847                 case FSIDSOURCE_FSID:
1848                         WRITE64((u64)exp->ex_fsid);
1849                         WRITE64((u64)0);
1850                         break;
1851                 case FSIDSOURCE_DEV:
1852                         WRITE32(0);
1853                         WRITE32(MAJOR(stat.dev));
1854                         WRITE32(0);
1855                         WRITE32(MINOR(stat.dev));
1856                         break;
1857                 case FSIDSOURCE_UUID:
1858                         WRITEMEM(exp->ex_uuid, 16);
1859                         break;
1860                 }
1861         }
1862         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1863                 if ((buflen -= 4) < 0)
1864                         goto out_resource;
1865                 WRITE32(0);
1866         }
1867         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1868                 if ((buflen -= 4) < 0)
1869                         goto out_resource;
1870                 WRITE32(NFSD_LEASE_TIME);
1871         }
1872         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1873                 if ((buflen -= 4) < 0)
1874                         goto out_resource;
1875                 WRITE32(rdattr_err);
1876         }
1877         if (bmval0 & FATTR4_WORD0_ACL) {
1878                 struct nfs4_ace *ace;
1879
1880                 if (acl == NULL) {
1881                         if ((buflen -= 4) < 0)
1882                                 goto out_resource;
1883
1884                         WRITE32(0);
1885                         goto out_acl;
1886                 }
1887                 if ((buflen -= 4) < 0)
1888                         goto out_resource;
1889                 WRITE32(acl->naces);
1890
1891                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1892                         if ((buflen -= 4*3) < 0)
1893                                 goto out_resource;
1894                         WRITE32(ace->type);
1895                         WRITE32(ace->flag);
1896                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1897                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1898                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1899                                 &p, &buflen);
1900                         if (status == nfserr_resource)
1901                                 goto out_resource;
1902                         if (status)
1903                                 goto out;
1904                 }
1905         }
1906 out_acl:
1907         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1908                 if ((buflen -= 4) < 0)
1909                         goto out_resource;
1910                 WRITE32(aclsupport ?
1911                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1912         }
1913         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1914                 if ((buflen -= 4) < 0)
1915                         goto out_resource;
1916                 WRITE32(1);
1917         }
1918         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1919                 if ((buflen -= 4) < 0)
1920                         goto out_resource;
1921                 WRITE32(1);
1922         }
1923         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1924                 if ((buflen -= 4) < 0)
1925                         goto out_resource;
1926                 WRITE32(1);
1927         }
1928         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1929                 if ((buflen -= 4) < 0)
1930                         goto out_resource;
1931                 WRITE32(1);
1932         }
1933         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1934                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1935                 if (buflen < 0)
1936                         goto out_resource;
1937                 WRITE32(fhp->fh_handle.fh_size);
1938                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1939         }
1940         if (bmval0 & FATTR4_WORD0_FILEID) {
1941                 if ((buflen -= 8) < 0)
1942                         goto out_resource;
1943                 WRITE64(stat.ino);
1944         }
1945         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1946                 if ((buflen -= 8) < 0)
1947                         goto out_resource;
1948                 WRITE64((u64) statfs.f_ffree);
1949         }
1950         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1951                 if ((buflen -= 8) < 0)
1952                         goto out_resource;
1953                 WRITE64((u64) statfs.f_ffree);
1954         }
1955         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1956                 if ((buflen -= 8) < 0)
1957                         goto out_resource;
1958                 WRITE64((u64) statfs.f_files);
1959         }
1960         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1961                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1962                 if (status == nfserr_resource)
1963                         goto out_resource;
1964                 if (status)
1965                         goto out;
1966         }
1967         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1968                 if ((buflen -= 4) < 0)
1969                         goto out_resource;
1970                 WRITE32(1);
1971         }
1972         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1973                 if ((buflen -= 8) < 0)
1974                         goto out_resource;
1975                 WRITE64(~(u64)0);
1976         }
1977         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1978                 if ((buflen -= 4) < 0)
1979                         goto out_resource;
1980                 WRITE32(255);
1981         }
1982         if (bmval0 & FATTR4_WORD0_MAXNAME) {
1983                 if ((buflen -= 4) < 0)
1984                         goto out_resource;
1985                 WRITE32(statfs.f_namelen);
1986         }
1987         if (bmval0 & FATTR4_WORD0_MAXREAD) {
1988                 if ((buflen -= 8) < 0)
1989                         goto out_resource;
1990                 WRITE64((u64) svc_max_payload(rqstp));
1991         }
1992         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1993                 if ((buflen -= 8) < 0)
1994                         goto out_resource;
1995                 WRITE64((u64) svc_max_payload(rqstp));
1996         }
1997         if (bmval1 & FATTR4_WORD1_MODE) {
1998                 if ((buflen -= 4) < 0)
1999                         goto out_resource;
2000                 WRITE32(stat.mode & S_IALLUGO);
2001         }
2002         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2003                 if ((buflen -= 4) < 0)
2004                         goto out_resource;
2005                 WRITE32(1);
2006         }
2007         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2008                 if ((buflen -= 4) < 0)
2009                         goto out_resource;
2010                 WRITE32(stat.nlink);
2011         }
2012         if (bmval1 & FATTR4_WORD1_OWNER) {
2013                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2014                 if (status == nfserr_resource)
2015                         goto out_resource;
2016                 if (status)
2017                         goto out;
2018         }
2019         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2020                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2021                 if (status == nfserr_resource)
2022                         goto out_resource;
2023                 if (status)
2024                         goto out;
2025         }
2026         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2027                 if ((buflen -= 8) < 0)
2028                         goto out_resource;
2029                 WRITE32((u32) MAJOR(stat.rdev));
2030                 WRITE32((u32) MINOR(stat.rdev));
2031         }
2032         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2033                 if ((buflen -= 8) < 0)
2034                         goto out_resource;
2035                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2036                 WRITE64(dummy64);
2037         }
2038         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2039                 if ((buflen -= 8) < 0)
2040                         goto out_resource;
2041                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2042                 WRITE64(dummy64);
2043         }
2044         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2045                 if ((buflen -= 8) < 0)
2046                         goto out_resource;
2047                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2048                 WRITE64(dummy64);
2049         }
2050         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2051                 if ((buflen -= 8) < 0)
2052                         goto out_resource;
2053                 dummy64 = (u64)stat.blocks << 9;
2054                 WRITE64(dummy64);
2055         }
2056         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2057                 if ((buflen -= 12) < 0)
2058                         goto out_resource;
2059                 WRITE32(0);
2060                 WRITE32(stat.atime.tv_sec);
2061                 WRITE32(stat.atime.tv_nsec);
2062         }
2063         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2064                 if ((buflen -= 12) < 0)
2065                         goto out_resource;
2066                 WRITE32(0);
2067                 WRITE32(1);
2068                 WRITE32(0);
2069         }
2070         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2071                 if ((buflen -= 12) < 0)
2072                         goto out_resource;
2073                 WRITE32(0);
2074                 WRITE32(stat.ctime.tv_sec);
2075                 WRITE32(stat.ctime.tv_nsec);
2076         }
2077         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2078                 if ((buflen -= 12) < 0)
2079                         goto out_resource;
2080                 WRITE32(0);
2081                 WRITE32(stat.mtime.tv_sec);
2082                 WRITE32(stat.mtime.tv_nsec);
2083         }
2084         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2085                 if ((buflen -= 8) < 0)
2086                         goto out_resource;
2087                 /*
2088                  * Get parent's attributes if not ignoring crossmount
2089                  * and this is the root of a cross-mounted filesystem.
2090                  */
2091                 if (ignore_crossmnt == 0 &&
2092                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2093                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2094                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2095                         if (err)
2096                                 goto out_nfserr;
2097                 }
2098                 WRITE64(stat.ino);
2099         }
2100         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2101         *countp = p - buffer;
2102         status = nfs_ok;
2103
2104 out:
2105         kfree(acl);
2106         if (fhp == &tempfh)
2107                 fh_put(&tempfh);
2108         return status;
2109 out_nfserr:
2110         status = nfserrno(err);
2111         goto out;
2112 out_resource:
2113         *countp = 0;
2114         status = nfserr_resource;
2115         goto out;
2116 out_serverfault:
2117         status = nfserr_serverfault;
2118         goto out;
2119 }
2120
2121 static inline int attributes_need_mount(u32 *bmval)
2122 {
2123         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2124                 return 1;
2125         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2126                 return 1;
2127         return 0;
2128 }
2129
2130 static __be32
2131 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2132                 const char *name, int namlen, __be32 *p, int *buflen)
2133 {
2134         struct svc_export *exp = cd->rd_fhp->fh_export;
2135         struct dentry *dentry;
2136         __be32 nfserr;
2137         int ignore_crossmnt = 0;
2138
2139         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2140         if (IS_ERR(dentry))
2141                 return nfserrno(PTR_ERR(dentry));
2142
2143         exp_get(exp);
2144         /*
2145          * In the case of a mountpoint, the client may be asking for
2146          * attributes that are only properties of the underlying filesystem
2147          * as opposed to the cross-mounted file system. In such a case,
2148          * we will not follow the cross mount and will fill the attribtutes
2149          * directly from the mountpoint dentry.
2150          */
2151         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2152                 ignore_crossmnt = 1;
2153         else if (d_mountpoint(dentry)) {
2154                 int err;
2155
2156                 /*
2157                  * Why the heck aren't we just using nfsd_lookup??
2158                  * Different "."/".." handling?  Something else?
2159                  * At least, add a comment here to explain....
2160                  */
2161                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2162                 if (err) {
2163                         nfserr = nfserrno(err);
2164                         goto out_put;
2165                 }
2166                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2167                 if (nfserr)
2168                         goto out_put;
2169
2170         }
2171         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2172                                         cd->rd_rqstp, ignore_crossmnt);
2173 out_put:
2174         dput(dentry);
2175         exp_put(exp);
2176         return nfserr;
2177 }
2178
2179 static __be32 *
2180 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2181 {
2182         __be32 *attrlenp;
2183
2184         if (buflen < 6)
2185                 return NULL;
2186         *p++ = htonl(2);
2187         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2188         *p++ = htonl(0);                         /* bmval1 */
2189
2190         attrlenp = p++;
2191         *p++ = nfserr;       /* no htonl */
2192         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2193         return p;
2194 }
2195
2196 static int
2197 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2198                     loff_t offset, u64 ino, unsigned int d_type)
2199 {
2200         struct readdir_cd *ccd = ccdv;
2201         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2202         int buflen;
2203         __be32 *p = cd->buffer;
2204         __be32 nfserr = nfserr_toosmall;
2205
2206         /* In nfsv4, "." and ".." never make it onto the wire.. */
2207         if (name && isdotent(name, namlen)) {
2208                 cd->common.err = nfs_ok;
2209                 return 0;
2210         }
2211
2212         if (cd->offset)
2213                 xdr_encode_hyper(cd->offset, (u64) offset);
2214
2215         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2216         if (buflen < 0)
2217                 goto fail;
2218
2219         *p++ = xdr_one;                             /* mark entry present */
2220         cd->offset = p;                             /* remember pointer */
2221         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2222         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2223
2224         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2225         switch (nfserr) {
2226         case nfs_ok:
2227                 p += buflen;
2228                 break;
2229         case nfserr_resource:
2230                 nfserr = nfserr_toosmall;
2231                 goto fail;
2232         case nfserr_dropit:
2233                 goto fail;
2234         default:
2235                 /*
2236                  * If the client requested the RDATTR_ERROR attribute,
2237                  * we stuff the error code into this attribute
2238                  * and continue.  If this attribute was not requested,
2239                  * then in accordance with the spec, we fail the
2240                  * entire READDIR operation(!)
2241                  */
2242                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2243                         goto fail;
2244                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2245                 if (p == NULL) {
2246                         nfserr = nfserr_toosmall;
2247                         goto fail;
2248                 }
2249         }
2250         cd->buflen -= (p - cd->buffer);
2251         cd->buffer = p;
2252         cd->common.err = nfs_ok;
2253         return 0;
2254 fail:
2255         cd->common.err = nfserr;
2256         return -EINVAL;
2257 }
2258
2259 static void
2260 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2261 {
2262         ENCODE_HEAD;
2263
2264         RESERVE_SPACE(sizeof(stateid_t));
2265         WRITE32(sid->si_generation);
2266         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2267         ADJUST_ARGS();
2268 }
2269
2270 static __be32
2271 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2272 {
2273         ENCODE_HEAD;
2274
2275         if (!nfserr) {
2276                 RESERVE_SPACE(8);
2277                 WRITE32(access->ac_supported);
2278                 WRITE32(access->ac_resp_access);
2279                 ADJUST_ARGS();
2280         }
2281         return nfserr;
2282 }
2283
2284 static __be32
2285 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2286 {
2287         ENCODE_SEQID_OP_HEAD;
2288
2289         if (!nfserr)
2290                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2291
2292         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2293         return nfserr;
2294 }
2295
2296
2297 static __be32
2298 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2299 {
2300         ENCODE_HEAD;
2301
2302         if (!nfserr) {
2303                 RESERVE_SPACE(8);
2304                 WRITEMEM(commit->co_verf.data, 8);
2305                 ADJUST_ARGS();
2306         }
2307         return nfserr;
2308 }
2309
2310 static __be32
2311 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2312 {
2313         ENCODE_HEAD;
2314
2315         if (!nfserr) {
2316                 RESERVE_SPACE(32);
2317                 WRITECINFO(create->cr_cinfo);
2318                 WRITE32(2);
2319                 WRITE32(create->cr_bmval[0]);
2320                 WRITE32(create->cr_bmval[1]);
2321                 ADJUST_ARGS();
2322         }
2323         return nfserr;
2324 }
2325
2326 static __be32
2327 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2328 {
2329         struct svc_fh *fhp = getattr->ga_fhp;
2330         int buflen;
2331
2332         if (nfserr)
2333                 return nfserr;
2334
2335         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2336         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2337                                     resp->p, &buflen, getattr->ga_bmval,
2338                                     resp->rqstp, 0);
2339         if (!nfserr)
2340                 resp->p += buflen;
2341         return nfserr;
2342 }
2343
2344 static __be32
2345 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2346 {
2347         struct svc_fh *fhp = *fhpp;
2348         unsigned int len;
2349         ENCODE_HEAD;
2350
2351         if (!nfserr) {
2352                 len = fhp->fh_handle.fh_size;
2353                 RESERVE_SPACE(len + 4);
2354                 WRITE32(len);
2355                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2356                 ADJUST_ARGS();
2357         }
2358         return nfserr;
2359 }
2360
2361 /*
2362 * Including all fields other than the name, a LOCK4denied structure requires
2363 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2364 */
2365 static void
2366 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2367 {
2368         ENCODE_HEAD;
2369
2370         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2371         WRITE64(ld->ld_start);
2372         WRITE64(ld->ld_length);
2373         WRITE32(ld->ld_type);
2374         if (ld->ld_sop) {
2375                 WRITEMEM(&ld->ld_clientid, 8);
2376                 WRITE32(ld->ld_sop->so_owner.len);
2377                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2378                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2379         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2380                 WRITE64((u64)0); /* clientid */
2381                 WRITE32(0); /* length of owner name */
2382         }
2383         ADJUST_ARGS();
2384 }
2385
2386 static __be32
2387 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2388 {
2389         ENCODE_SEQID_OP_HEAD;
2390
2391         if (!nfserr)
2392                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2393         else if (nfserr == nfserr_denied)
2394                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2395
2396         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2397         return nfserr;
2398 }
2399
2400 static __be32
2401 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2402 {
2403         if (nfserr == nfserr_denied)
2404                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2405         return nfserr;
2406 }
2407
2408 static __be32
2409 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2410 {
2411         ENCODE_SEQID_OP_HEAD;
2412
2413         if (!nfserr)
2414                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2415
2416         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2417         return nfserr;
2418 }
2419
2420
2421 static __be32
2422 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2423 {
2424         ENCODE_HEAD;
2425
2426         if (!nfserr) {
2427                 RESERVE_SPACE(20);
2428                 WRITECINFO(link->li_cinfo);
2429                 ADJUST_ARGS();
2430         }
2431         return nfserr;
2432 }
2433
2434
2435 static __be32
2436 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2437 {
2438         ENCODE_HEAD;
2439         ENCODE_SEQID_OP_HEAD;
2440
2441         if (nfserr)
2442                 goto out;
2443
2444         nfsd4_encode_stateid(resp, &open->op_stateid);
2445         RESERVE_SPACE(40);
2446         WRITECINFO(open->op_cinfo);
2447         WRITE32(open->op_rflags);
2448         WRITE32(2);
2449         WRITE32(open->op_bmval[0]);
2450         WRITE32(open->op_bmval[1]);
2451         WRITE32(open->op_delegate_type);
2452         ADJUST_ARGS();
2453
2454         switch (open->op_delegate_type) {
2455         case NFS4_OPEN_DELEGATE_NONE:
2456                 break;
2457         case NFS4_OPEN_DELEGATE_READ:
2458                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2459                 RESERVE_SPACE(20);
2460                 WRITE32(open->op_recall);
2461
2462                 /*
2463                  * TODO: ACE's in delegations
2464                  */
2465                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2466                 WRITE32(0);
2467                 WRITE32(0);
2468                 WRITE32(0);   /* XXX: is NULL principal ok? */
2469                 ADJUST_ARGS();
2470                 break;
2471         case NFS4_OPEN_DELEGATE_WRITE:
2472                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2473                 RESERVE_SPACE(32);
2474                 WRITE32(0);
2475
2476                 /*
2477                  * TODO: space_limit's in delegations
2478                  */
2479                 WRITE32(NFS4_LIMIT_SIZE);
2480                 WRITE32(~(u32)0);
2481                 WRITE32(~(u32)0);
2482
2483                 /*
2484                  * TODO: ACE's in delegations
2485                  */
2486                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2487                 WRITE32(0);
2488                 WRITE32(0);
2489                 WRITE32(0);   /* XXX: is NULL principal ok? */
2490                 ADJUST_ARGS();
2491                 break;
2492         default:
2493                 BUG();
2494         }
2495         /* XXX save filehandle here */
2496 out:
2497         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2498         return nfserr;
2499 }
2500
2501 static __be32
2502 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2503 {
2504         ENCODE_SEQID_OP_HEAD;
2505
2506         if (!nfserr)
2507                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2508
2509         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2510         return nfserr;
2511 }
2512
2513 static __be32
2514 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2515 {
2516         ENCODE_SEQID_OP_HEAD;
2517
2518         if (!nfserr)
2519                 nfsd4_encode_stateid(resp, &od->od_stateid);
2520
2521         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2522         return nfserr;
2523 }
2524
2525 static __be32
2526 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2527                   struct nfsd4_read *read)
2528 {
2529         u32 eof;
2530         int v, pn;
2531         unsigned long maxcount; 
2532         long len;
2533         ENCODE_HEAD;
2534
2535         if (nfserr)
2536                 return nfserr;
2537         if (resp->xbuf->page_len)
2538                 return nfserr_resource;
2539
2540         RESERVE_SPACE(8); /* eof flag and byte count */
2541
2542         maxcount = svc_max_payload(resp->rqstp);
2543         if (maxcount > read->rd_length)
2544                 maxcount = read->rd_length;
2545
2546         len = maxcount;
2547         v = 0;
2548         while (len > 0) {
2549                 pn = resp->rqstp->rq_resused++;
2550                 resp->rqstp->rq_vec[v].iov_base =
2551                         page_address(resp->rqstp->rq_respages[pn]);
2552                 resp->rqstp->rq_vec[v].iov_len =
2553                         len < PAGE_SIZE ? len : PAGE_SIZE;
2554                 v++;
2555                 len -= PAGE_SIZE;
2556         }
2557         read->rd_vlen = v;
2558
2559         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2560                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2561                         &maxcount);
2562
2563         if (nfserr == nfserr_symlink)
2564                 nfserr = nfserr_inval;
2565         if (nfserr)
2566                 return nfserr;
2567         eof = (read->rd_offset + maxcount >=
2568                read->rd_fhp->fh_dentry->d_inode->i_size);
2569
2570         WRITE32(eof);
2571         WRITE32(maxcount);
2572         ADJUST_ARGS();
2573         resp->xbuf->head[0].iov_len = (char*)p
2574                                         - (char*)resp->xbuf->head[0].iov_base;
2575         resp->xbuf->page_len = maxcount;
2576
2577         /* Use rest of head for padding and remaining ops: */
2578         resp->xbuf->tail[0].iov_base = p;
2579         resp->xbuf->tail[0].iov_len = 0;
2580         if (maxcount&3) {
2581                 RESERVE_SPACE(4);
2582                 WRITE32(0);
2583                 resp->xbuf->tail[0].iov_base += maxcount&3;
2584                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2585                 ADJUST_ARGS();
2586         }
2587         return 0;
2588 }
2589
2590 static __be32
2591 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2592 {
2593         int maxcount;
2594         char *page;
2595         ENCODE_HEAD;
2596
2597         if (nfserr)
2598                 return nfserr;
2599         if (resp->xbuf->page_len)
2600                 return nfserr_resource;
2601
2602         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2603
2604         maxcount = PAGE_SIZE;
2605         RESERVE_SPACE(4);
2606
2607         /*
2608          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2609          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2610          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2611          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2612          */
2613         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2614         if (nfserr == nfserr_isdir)
2615                 return nfserr_inval;
2616         if (nfserr)
2617                 return nfserr;
2618
2619         WRITE32(maxcount);
2620         ADJUST_ARGS();
2621         resp->xbuf->head[0].iov_len = (char*)p
2622                                 - (char*)resp->xbuf->head[0].iov_base;
2623         resp->xbuf->page_len = maxcount;
2624
2625         /* Use rest of head for padding and remaining ops: */
2626         resp->xbuf->tail[0].iov_base = p;
2627         resp->xbuf->tail[0].iov_len = 0;
2628         if (maxcount&3) {
2629                 RESERVE_SPACE(4);
2630                 WRITE32(0);
2631                 resp->xbuf->tail[0].iov_base += maxcount&3;
2632                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2633                 ADJUST_ARGS();
2634         }
2635         return 0;
2636 }
2637
2638 static __be32
2639 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2640 {
2641         int maxcount;
2642         loff_t offset;
2643         __be32 *page, *savep, *tailbase;
2644         ENCODE_HEAD;
2645
2646         if (nfserr)
2647                 return nfserr;
2648         if (resp->xbuf->page_len)
2649                 return nfserr_resource;
2650
2651         RESERVE_SPACE(8);  /* verifier */
2652         savep = p;
2653
2654         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2655         WRITE32(0);
2656         WRITE32(0);
2657         ADJUST_ARGS();
2658         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2659         tailbase = p;
2660
2661         maxcount = PAGE_SIZE;
2662         if (maxcount > readdir->rd_maxcount)
2663                 maxcount = readdir->rd_maxcount;
2664
2665         /*
2666          * Convert from bytes to words, account for the two words already
2667          * written, make sure to leave two words at the end for the next
2668          * pointer and eof field.
2669          */
2670         maxcount = (maxcount >> 2) - 4;
2671         if (maxcount < 0) {
2672                 nfserr =  nfserr_toosmall;
2673                 goto err_no_verf;
2674         }
2675
2676         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2677         readdir->common.err = 0;
2678         readdir->buflen = maxcount;
2679         readdir->buffer = page;
2680         readdir->offset = NULL;
2681
2682         offset = readdir->rd_cookie;
2683         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2684                               &offset,
2685                               &readdir->common, nfsd4_encode_dirent);
2686         if (nfserr == nfs_ok &&
2687             readdir->common.err == nfserr_toosmall &&
2688             readdir->buffer == page) 
2689                 nfserr = nfserr_toosmall;
2690         if (nfserr == nfserr_symlink)
2691                 nfserr = nfserr_notdir;
2692         if (nfserr)
2693                 goto err_no_verf;
2694
2695         if (readdir->offset)
2696                 xdr_encode_hyper(readdir->offset, offset);
2697
2698         p = readdir->buffer;
2699         *p++ = 0;       /* no more entries */
2700         *p++ = htonl(readdir->common.err == nfserr_eof);
2701         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2702                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2703
2704         /* Use rest of head for padding and remaining ops: */
2705         resp->xbuf->tail[0].iov_base = tailbase;
2706         resp->xbuf->tail[0].iov_len = 0;
2707         resp->p = resp->xbuf->tail[0].iov_base;
2708         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2709
2710         return 0;
2711 err_no_verf:
2712         p = savep;
2713         ADJUST_ARGS();
2714         return nfserr;
2715 }
2716
2717 static __be32
2718 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2719 {
2720         ENCODE_HEAD;
2721
2722         if (!nfserr) {
2723                 RESERVE_SPACE(20);
2724                 WRITECINFO(remove->rm_cinfo);
2725                 ADJUST_ARGS();
2726         }
2727         return nfserr;
2728 }
2729
2730 static __be32
2731 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2732 {
2733         ENCODE_HEAD;
2734
2735         if (!nfserr) {
2736                 RESERVE_SPACE(40);
2737                 WRITECINFO(rename->rn_sinfo);
2738                 WRITECINFO(rename->rn_tinfo);
2739                 ADJUST_ARGS();
2740         }
2741         return nfserr;
2742 }
2743
2744 static __be32
2745 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2746                      struct nfsd4_secinfo *secinfo)
2747 {
2748         int i = 0;
2749         struct svc_export *exp = secinfo->si_exp;
2750         u32 nflavs;
2751         struct exp_flavor_info *flavs;
2752         struct exp_flavor_info def_flavs[2];
2753         ENCODE_HEAD;
2754
2755         if (nfserr)
2756                 goto out;
2757         if (exp->ex_nflavors) {
2758                 flavs = exp->ex_flavors;
2759                 nflavs = exp->ex_nflavors;
2760         } else { /* Handling of some defaults in absence of real secinfo: */
2761                 flavs = def_flavs;
2762                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2763                         nflavs = 2;
2764                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2765                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2766                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2767                         nflavs = 1;
2768                         flavs[0].pseudoflavor
2769                                         = svcauth_gss_flavor(exp->ex_client);
2770                 } else {
2771                         nflavs = 1;
2772                         flavs[0].pseudoflavor
2773                                         = exp->ex_client->flavour->flavour;
2774                 }
2775         }
2776
2777         RESERVE_SPACE(4);
2778         WRITE32(nflavs);
2779         ADJUST_ARGS();
2780         for (i = 0; i < nflavs; i++) {
2781                 u32 flav = flavs[i].pseudoflavor;
2782                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2783
2784                 if (gm) {
2785                         RESERVE_SPACE(4);
2786                         WRITE32(RPC_AUTH_GSS);
2787                         ADJUST_ARGS();
2788                         RESERVE_SPACE(4 + gm->gm_oid.len);
2789                         WRITE32(gm->gm_oid.len);
2790                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2791                         ADJUST_ARGS();
2792                         RESERVE_SPACE(4);
2793                         WRITE32(0); /* qop */
2794                         ADJUST_ARGS();
2795                         RESERVE_SPACE(4);
2796                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2797                         ADJUST_ARGS();
2798                         gss_mech_put(gm);
2799                 } else {
2800                         RESERVE_SPACE(4);
2801                         WRITE32(flav);
2802                         ADJUST_ARGS();
2803                 }
2804         }
2805 out:
2806         if (exp)
2807                 exp_put(exp);
2808         return nfserr;
2809 }
2810
2811 /*
2812  * The SETATTR encode routine is special -- it always encodes a bitmap,
2813  * regardless of the error status.
2814  */
2815 static __be32
2816 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2817 {
2818         ENCODE_HEAD;
2819
2820         RESERVE_SPACE(12);
2821         if (nfserr) {
2822                 WRITE32(2);
2823                 WRITE32(0);
2824                 WRITE32(0);
2825         }
2826         else {
2827                 WRITE32(2);
2828                 WRITE32(setattr->sa_bmval[0]);
2829                 WRITE32(setattr->sa_bmval[1]);
2830         }
2831         ADJUST_ARGS();
2832         return nfserr;
2833 }
2834
2835 static __be32
2836 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2837 {
2838         ENCODE_HEAD;
2839
2840         if (!nfserr) {
2841                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2842                 WRITEMEM(&scd->se_clientid, 8);
2843                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2844                 ADJUST_ARGS();
2845         }
2846         else if (nfserr == nfserr_clid_inuse) {
2847                 RESERVE_SPACE(8);
2848                 WRITE32(0);
2849                 WRITE32(0);
2850                 ADJUST_ARGS();
2851         }
2852         return nfserr;
2853 }
2854
2855 static __be32
2856 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2857 {
2858         ENCODE_HEAD;
2859
2860         if (!nfserr) {
2861                 RESERVE_SPACE(16);
2862                 WRITE32(write->wr_bytes_written);
2863                 WRITE32(write->wr_how_written);
2864                 WRITEMEM(write->wr_verifier.data, 8);
2865                 ADJUST_ARGS();
2866         }
2867         return nfserr;
2868 }
2869
2870 static __be32
2871 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2872                          struct nfsd4_exchange_id *exid)
2873 {
2874         ENCODE_HEAD;
2875         char *major_id;
2876         char *server_scope;
2877         int major_id_sz;
2878         int server_scope_sz;
2879         uint64_t minor_id = 0;
2880
2881         if (nfserr)
2882                 return nfserr;
2883
2884         major_id = utsname()->nodename;
2885         major_id_sz = strlen(major_id);
2886         server_scope = utsname()->nodename;
2887         server_scope_sz = strlen(server_scope);
2888
2889         RESERVE_SPACE(
2890                 8 /* eir_clientid */ +
2891                 4 /* eir_sequenceid */ +
2892                 4 /* eir_flags */ +
2893                 4 /* spr_how (SP4_NONE) */ +
2894                 8 /* so_minor_id */ +
2895                 4 /* so_major_id.len */ +
2896                 (XDR_QUADLEN(major_id_sz) * 4) +
2897                 4 /* eir_server_scope.len */ +
2898                 (XDR_QUADLEN(server_scope_sz) * 4) +
2899                 4 /* eir_server_impl_id.count (0) */);
2900
2901         WRITEMEM(&exid->clientid, 8);
2902         WRITE32(exid->seqid);
2903         WRITE32(exid->flags);
2904
2905         /* state_protect4_r. Currently only support SP4_NONE */
2906         BUG_ON(exid->spa_how != SP4_NONE);
2907         WRITE32(exid->spa_how);
2908
2909         /* The server_owner struct */
2910         WRITE64(minor_id);      /* Minor id */
2911         /* major id */
2912         WRITE32(major_id_sz);
2913         WRITEMEM(major_id, major_id_sz);
2914
2915         /* Server scope */
2916         WRITE32(server_scope_sz);
2917         WRITEMEM(server_scope, server_scope_sz);
2918
2919         /* Implementation id */
2920         WRITE32(0);     /* zero length nfs_impl_id4 array */
2921         ADJUST_ARGS();
2922         return 0;
2923 }
2924
2925 static __be32
2926 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2927                             struct nfsd4_create_session *sess)
2928 {
2929         ENCODE_HEAD;
2930
2931         if (nfserr)
2932                 return nfserr;
2933
2934         RESERVE_SPACE(24);
2935         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2936         WRITE32(sess->seqid);
2937         WRITE32(sess->flags);
2938         ADJUST_ARGS();
2939
2940         RESERVE_SPACE(28);
2941         WRITE32(0); /* headerpadsz */
2942         WRITE32(sess->fore_channel.maxreq_sz);
2943         WRITE32(sess->fore_channel.maxresp_sz);
2944         WRITE32(sess->fore_channel.maxresp_cached);
2945         WRITE32(sess->fore_channel.maxops);
2946         WRITE32(sess->fore_channel.maxreqs);
2947         WRITE32(sess->fore_channel.nr_rdma_attrs);
2948         ADJUST_ARGS();
2949
2950         if (sess->fore_channel.nr_rdma_attrs) {
2951                 RESERVE_SPACE(4);
2952                 WRITE32(sess->fore_channel.rdma_attrs);
2953                 ADJUST_ARGS();
2954         }
2955
2956         RESERVE_SPACE(28);
2957         WRITE32(0); /* headerpadsz */
2958         WRITE32(sess->back_channel.maxreq_sz);
2959         WRITE32(sess->back_channel.maxresp_sz);
2960         WRITE32(sess->back_channel.maxresp_cached);
2961         WRITE32(sess->back_channel.maxops);
2962         WRITE32(sess->back_channel.maxreqs);
2963         WRITE32(sess->back_channel.nr_rdma_attrs);
2964         ADJUST_ARGS();
2965
2966         if (sess->back_channel.nr_rdma_attrs) {
2967                 RESERVE_SPACE(4);
2968                 WRITE32(sess->back_channel.rdma_attrs);
2969                 ADJUST_ARGS();
2970         }
2971         return 0;
2972 }
2973
2974 static __be32
2975 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
2976                              struct nfsd4_destroy_session *destroy_session)
2977 {
2978         return nfserr;
2979 }
2980
2981 __be32
2982 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
2983                       struct nfsd4_sequence *seq)
2984 {
2985         ENCODE_HEAD;
2986
2987         if (nfserr)
2988                 return nfserr;
2989
2990         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
2991         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2992         WRITE32(seq->seqid);
2993         WRITE32(seq->slotid);
2994         WRITE32(seq->maxslots);
2995         /*
2996          * FIXME: for now:
2997          *   target_maxslots = maxslots
2998          *   status_flags = 0
2999          */
3000         WRITE32(seq->maxslots);
3001         WRITE32(0);
3002
3003         ADJUST_ARGS();
3004         return 0;
3005 }
3006
3007 static __be32
3008 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3009 {
3010         return nfserr;
3011 }
3012
3013 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3014
3015 /*
3016  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3017  * since we don't need to filter out obsolete ops as this is
3018  * done in the decoding phase.
3019  */
3020 static nfsd4_enc nfsd4_enc_ops[] = {
3021         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3022         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3023         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3024         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3025         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3026         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3027         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3028         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3029         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3030         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3031         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3032         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3033         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3034         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3035         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3036         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3037         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3038         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3039         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3040         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3041         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3042         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3043         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3044         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3045         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3046         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3047         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3048         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3049         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3050         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3051         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3052         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3053         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3054         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3055         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3056         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3057         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3058
3059         /* NFSv4.1 operations */
3060         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3061         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3062         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3063         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3064         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3065         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3066         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3067         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3068         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3069         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3070         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3071         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3072         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3073         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3074         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3075         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3076         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3077         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3078         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3079 };
3080
3081 void
3082 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3083 {
3084         __be32 *statp;
3085         ENCODE_HEAD;
3086
3087         RESERVE_SPACE(8);
3088         WRITE32(op->opnum);
3089         statp = p++;    /* to be backfilled at the end */
3090         ADJUST_ARGS();
3091
3092         if (op->opnum == OP_ILLEGAL)
3093                 goto status;
3094         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3095                !nfsd4_enc_ops[op->opnum]);
3096         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3097 status:
3098         /*
3099          * Note: We write the status directly, instead of using WRITE32(),
3100          * since it is already in network byte order.
3101          */
3102         *statp = op->status;
3103 }
3104
3105 /* 
3106  * Encode the reply stored in the stateowner reply cache 
3107  * 
3108  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3109  * previously sent already encoded operation.
3110  *
3111  * called with nfs4_lock_state() held
3112  */
3113 void
3114 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3115 {
3116         ENCODE_HEAD;
3117         struct nfs4_replay *rp = op->replay;
3118
3119         BUG_ON(!rp);
3120
3121         RESERVE_SPACE(8);
3122         WRITE32(op->opnum);
3123         *p++ = rp->rp_status;  /* already xdr'ed */
3124         ADJUST_ARGS();
3125
3126         RESERVE_SPACE(rp->rp_buflen);
3127         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3128         ADJUST_ARGS();
3129 }
3130
3131 /*
3132  * END OF "GENERIC" ENCODE ROUTINES.
3133  */
3134
3135 int
3136 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3137 {
3138         return xdr_ressize_check(rqstp, p);
3139 }
3140
3141 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3142 {
3143         if (args->ops != args->iops) {
3144                 kfree(args->ops);
3145                 args->ops = args->iops;
3146         }
3147         kfree(args->tmpp);
3148         args->tmpp = NULL;
3149         while (args->to_free) {
3150                 struct tmpbuf *tb = args->to_free;
3151                 args->to_free = tb->next;
3152                 tb->release(tb->buf);
3153                 kfree(tb);
3154         }
3155 }
3156
3157 int
3158 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3159 {
3160         __be32 status;
3161
3162         args->p = p;
3163         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3164         args->pagelist = rqstp->rq_arg.pages;
3165         args->pagelen = rqstp->rq_arg.page_len;
3166         args->tmpp = NULL;
3167         args->to_free = NULL;
3168         args->ops = args->iops;
3169         args->rqstp = rqstp;
3170
3171         status = nfsd4_decode_compound(args);
3172         if (status) {
3173                 nfsd4_release_compoundargs(args);
3174         }
3175         return !status;
3176 }
3177
3178 int
3179 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3180 {
3181         /*
3182          * All that remains is to write the tag and operation count...
3183          */
3184         struct kvec *iov;
3185         p = resp->tagp;
3186         *p++ = htonl(resp->taglen);
3187         memcpy(p, resp->tag, resp->taglen);
3188         p += XDR_QUADLEN(resp->taglen);
3189         *p++ = htonl(resp->opcnt);
3190
3191         if (rqstp->rq_res.page_len) 
3192                 iov = &rqstp->rq_res.tail[0];
3193         else
3194                 iov = &rqstp->rq_res.head[0];
3195         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3196         BUG_ON(iov->iov_len > PAGE_SIZE);
3197         if (nfsd4_has_session(&resp->cstate)) {
3198                 if (resp->cstate.status == nfserr_replay_cache &&
3199                                 !nfsd4_not_cached(resp)) {
3200                         iov->iov_len = resp->cstate.iovlen;
3201                 } else {
3202                         nfsd4_store_cache_entry(resp);
3203                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3204                         resp->cstate.slot->sl_inuse = 0;
3205                 }
3206                 if (resp->cstate.session)
3207                         nfsd4_put_session(resp->cstate.session);
3208         }
3209         return 1;
3210 }
3211
3212 /*
3213  * Local variables:
3214  *  c-basic-offset: 8
3215  * End:
3216  */