ac17a70802399b9a9766ad8f593a21266d60a7a1
[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/slab.h>
44 #include <linux/namei.h>
45 #include <linux/statfs.h>
46 #include <linux/utsname.h>
47 #include <linux/nfsd_idmap.h>
48 #include <linux/nfs4_acl.h>
49 #include <linux/sunrpc/svcauth_gss.h>
50
51 #include "xdr4.h"
52 #include "vfs.h"
53
54 #define NFSDDBG_FACILITY                NFSDDBG_XDR
55
56 /*
57  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
58  * directory in order to indicate to the client that a filesystem boundary is present
59  * We use a fixed fsid for a referral
60  */
61 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
62 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
63
64 static __be32
65 check_filename(char *str, int len, __be32 err)
66 {
67         int i;
68
69         if (len == 0)
70                 return nfserr_inval;
71         if (isdotent(str, len))
72                 return err;
73         for (i = 0; i < len; i++)
74                 if (str[i] == '/')
75                         return err;
76         return 0;
77 }
78
79 #define DECODE_HEAD                             \
80         __be32 *p;                              \
81         __be32 status
82 #define DECODE_TAIL                             \
83         status = 0;                             \
84 out:                                            \
85         return status;                          \
86 xdr_error:                                      \
87         dprintk("NFSD: xdr error (%s:%d)\n",    \
88                         __FILE__, __LINE__);    \
89         status = nfserr_bad_xdr;                \
90         goto out
91
92 #define READ32(x)         (x) = ntohl(*p++)
93 #define READ64(x)         do {                  \
94         (x) = (u64)ntohl(*p++) << 32;           \
95         (x) |= ntohl(*p++);                     \
96 } while (0)
97 #define READTIME(x)       do {                  \
98         p++;                                    \
99         (x) = ntohl(*p++);                      \
100         p++;                                    \
101 } while (0)
102 #define READMEM(x,nbytes) do {                  \
103         x = (char *)p;                          \
104         p += XDR_QUADLEN(nbytes);               \
105 } while (0)
106 #define SAVEMEM(x,nbytes) do {                  \
107         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
108                 savemem(argp, p, nbytes) :      \
109                 (char *)p)) {                   \
110                 dprintk("NFSD: xdr error (%s:%d)\n", \
111                                 __FILE__, __LINE__); \
112                 goto xdr_error;                 \
113                 }                               \
114         p += XDR_QUADLEN(nbytes);               \
115 } while (0)
116 #define COPYMEM(x,nbytes) do {                  \
117         memcpy((x), p, nbytes);                 \
118         p += XDR_QUADLEN(nbytes);               \
119 } while (0)
120
121 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
122 #define READ_BUF(nbytes)  do {                  \
123         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
124                 p = argp->p;                    \
125                 argp->p += XDR_QUADLEN(nbytes); \
126         } else if (!(p = read_buf(argp, nbytes))) { \
127                 dprintk("NFSD: xdr error (%s:%d)\n", \
128                                 __FILE__, __LINE__); \
129                 goto xdr_error;                 \
130         }                                       \
131 } while (0)
132
133 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
134 {
135         /* We want more bytes than seem to be available.
136          * Maybe we need a new page, maybe we have just run out
137          */
138         unsigned int avail = (char *)argp->end - (char *)argp->p;
139         __be32 *p;
140         if (avail + argp->pagelen < nbytes)
141                 return NULL;
142         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
143                 return NULL;
144         /* ok, we can do it with the current plus the next page */
145         if (nbytes <= sizeof(argp->tmp))
146                 p = argp->tmp;
147         else {
148                 kfree(argp->tmpp);
149                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
150                 if (!p)
151                         return NULL;
152                 
153         }
154         /*
155          * The following memcpy is safe because read_buf is always
156          * called with nbytes > avail, and the two cases above both
157          * guarantee p points to at least nbytes bytes.
158          */
159         memcpy(p, argp->p, avail);
160         /* step to next page */
161         argp->p = page_address(argp->pagelist[0]);
162         argp->pagelist++;
163         if (argp->pagelen < PAGE_SIZE) {
164                 argp->end = argp->p + (argp->pagelen>>2);
165                 argp->pagelen = 0;
166         } else {
167                 argp->end = argp->p + (PAGE_SIZE>>2);
168                 argp->pagelen -= PAGE_SIZE;
169         }
170         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
171         argp->p += XDR_QUADLEN(nbytes - avail);
172         return p;
173 }
174
175 static int zero_clientid(clientid_t *clid)
176 {
177         return (clid->cl_boot == 0) && (clid->cl_id == 0);
178 }
179
180 static int
181 defer_free(struct nfsd4_compoundargs *argp,
182                 void (*release)(const void *), void *p)
183 {
184         struct tmpbuf *tb;
185
186         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
187         if (!tb)
188                 return -ENOMEM;
189         tb->buf = p;
190         tb->release = release;
191         tb->next = argp->to_free;
192         argp->to_free = tb;
193         return 0;
194 }
195
196 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
197 {
198         if (p == argp->tmp) {
199                 p = kmalloc(nbytes, GFP_KERNEL);
200                 if (!p)
201                         return NULL;
202                 memcpy(p, argp->tmp, nbytes);
203         } else {
204                 BUG_ON(p != argp->tmpp);
205                 argp->tmpp = NULL;
206         }
207         if (defer_free(argp, kfree, p)) {
208                 kfree(p);
209                 return NULL;
210         } else
211                 return (char *)p;
212 }
213
214 static __be32
215 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
216 {
217         u32 bmlen;
218         DECODE_HEAD;
219
220         bmval[0] = 0;
221         bmval[1] = 0;
222         bmval[2] = 0;
223
224         READ_BUF(4);
225         READ32(bmlen);
226         if (bmlen > 1000)
227                 goto xdr_error;
228
229         READ_BUF(bmlen << 2);
230         if (bmlen > 0)
231                 READ32(bmval[0]);
232         if (bmlen > 1)
233                 READ32(bmval[1]);
234         if (bmlen > 2)
235                 READ32(bmval[2]);
236
237         DECODE_TAIL;
238 }
239
240 static __be32
241 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
242                    struct iattr *iattr, struct nfs4_acl **acl)
243 {
244         int expected_len, len = 0;
245         u32 dummy32;
246         char *buf;
247         int host_err;
248
249         DECODE_HEAD;
250         iattr->ia_valid = 0;
251         if ((status = nfsd4_decode_bitmap(argp, bmval)))
252                 return status;
253
254         READ_BUF(4);
255         READ32(expected_len);
256
257         if (bmval[0] & FATTR4_WORD0_SIZE) {
258                 READ_BUF(8);
259                 len += 8;
260                 READ64(iattr->ia_size);
261                 iattr->ia_valid |= ATTR_SIZE;
262         }
263         if (bmval[0] & FATTR4_WORD0_ACL) {
264                 int nace;
265                 struct nfs4_ace *ace;
266
267                 READ_BUF(4); len += 4;
268                 READ32(nace);
269
270                 if (nace > NFS4_ACL_MAX)
271                         return nfserr_resource;
272
273                 *acl = nfs4_acl_new(nace);
274                 if (*acl == NULL) {
275                         host_err = -ENOMEM;
276                         goto out_nfserr;
277                 }
278                 defer_free(argp, kfree, *acl);
279
280                 (*acl)->naces = nace;
281                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
282                         READ_BUF(16); len += 16;
283                         READ32(ace->type);
284                         READ32(ace->flag);
285                         READ32(ace->access_mask);
286                         READ32(dummy32);
287                         READ_BUF(dummy32);
288                         len += XDR_QUADLEN(dummy32) << 2;
289                         READMEM(buf, dummy32);
290                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
291                         host_err = 0;
292                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
293                                 ace->who = 0;
294                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
295                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
296                                                 buf, dummy32, &ace->who);
297                         else
298                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
299                                                 buf, dummy32, &ace->who);
300                         if (host_err)
301                                 goto out_nfserr;
302                 }
303         } else
304                 *acl = NULL;
305         if (bmval[1] & FATTR4_WORD1_MODE) {
306                 READ_BUF(4);
307                 len += 4;
308                 READ32(iattr->ia_mode);
309                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
310                 iattr->ia_valid |= ATTR_MODE;
311         }
312         if (bmval[1] & FATTR4_WORD1_OWNER) {
313                 READ_BUF(4);
314                 len += 4;
315                 READ32(dummy32);
316                 READ_BUF(dummy32);
317                 len += (XDR_QUADLEN(dummy32) << 2);
318                 READMEM(buf, dummy32);
319                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
320                         goto out_nfserr;
321                 iattr->ia_valid |= ATTR_UID;
322         }
323         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
324                 READ_BUF(4);
325                 len += 4;
326                 READ32(dummy32);
327                 READ_BUF(dummy32);
328                 len += (XDR_QUADLEN(dummy32) << 2);
329                 READMEM(buf, dummy32);
330                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
331                         goto out_nfserr;
332                 iattr->ia_valid |= ATTR_GID;
333         }
334         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
335                 READ_BUF(4);
336                 len += 4;
337                 READ32(dummy32);
338                 switch (dummy32) {
339                 case NFS4_SET_TO_CLIENT_TIME:
340                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
341                            all 32 bits of 'nseconds'. */
342                         READ_BUF(12);
343                         len += 12;
344                         READ32(dummy32);
345                         if (dummy32)
346                                 return nfserr_inval;
347                         READ32(iattr->ia_atime.tv_sec);
348                         READ32(iattr->ia_atime.tv_nsec);
349                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
350                                 return nfserr_inval;
351                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
352                         break;
353                 case NFS4_SET_TO_SERVER_TIME:
354                         iattr->ia_valid |= ATTR_ATIME;
355                         break;
356                 default:
357                         goto xdr_error;
358                 }
359         }
360         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
361                 READ_BUF(4);
362                 len += 4;
363                 READ32(dummy32);
364                 switch (dummy32) {
365                 case NFS4_SET_TO_CLIENT_TIME:
366                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
367                            all 32 bits of 'nseconds'. */
368                         READ_BUF(12);
369                         len += 12;
370                         READ32(dummy32);
371                         if (dummy32)
372                                 return nfserr_inval;
373                         READ32(iattr->ia_mtime.tv_sec);
374                         READ32(iattr->ia_mtime.tv_nsec);
375                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
376                                 return nfserr_inval;
377                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
378                         break;
379                 case NFS4_SET_TO_SERVER_TIME:
380                         iattr->ia_valid |= ATTR_MTIME;
381                         break;
382                 default:
383                         goto xdr_error;
384                 }
385         }
386         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
387             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
388             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
389                 READ_BUF(expected_len - len);
390         else if (len != expected_len)
391                 goto xdr_error;
392
393         DECODE_TAIL;
394
395 out_nfserr:
396         status = nfserrno(host_err);
397         goto out;
398 }
399
400 static __be32
401 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
402 {
403         DECODE_HEAD;
404
405         READ_BUF(sizeof(stateid_t));
406         READ32(sid->si_generation);
407         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
408
409         DECODE_TAIL;
410 }
411
412 static __be32
413 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
414 {
415         DECODE_HEAD;
416
417         READ_BUF(4);
418         READ32(access->ac_req_access);
419
420         DECODE_TAIL;
421 }
422
423 static __be32
424 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
425 {
426         DECODE_HEAD;
427
428         close->cl_stateowner = NULL;
429         READ_BUF(4);
430         READ32(close->cl_seqid);
431         return nfsd4_decode_stateid(argp, &close->cl_stateid);
432
433         DECODE_TAIL;
434 }
435
436
437 static __be32
438 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
439 {
440         DECODE_HEAD;
441
442         READ_BUF(12);
443         READ64(commit->co_offset);
444         READ32(commit->co_count);
445
446         DECODE_TAIL;
447 }
448
449 static __be32
450 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
451 {
452         DECODE_HEAD;
453
454         READ_BUF(4);
455         READ32(create->cr_type);
456         switch (create->cr_type) {
457         case NF4LNK:
458                 READ_BUF(4);
459                 READ32(create->cr_linklen);
460                 READ_BUF(create->cr_linklen);
461                 SAVEMEM(create->cr_linkname, create->cr_linklen);
462                 break;
463         case NF4BLK:
464         case NF4CHR:
465                 READ_BUF(8);
466                 READ32(create->cr_specdata1);
467                 READ32(create->cr_specdata2);
468                 break;
469         case NF4SOCK:
470         case NF4FIFO:
471         case NF4DIR:
472         default:
473                 break;
474         }
475
476         READ_BUF(4);
477         READ32(create->cr_namelen);
478         READ_BUF(create->cr_namelen);
479         SAVEMEM(create->cr_name, create->cr_namelen);
480         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
481                 return status;
482
483         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
484                                     &create->cr_acl);
485         if (status)
486                 goto out;
487
488         DECODE_TAIL;
489 }
490
491 static inline __be32
492 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
493 {
494         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
495 }
496
497 static inline __be32
498 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
499 {
500         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
501 }
502
503 static __be32
504 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
505 {
506         DECODE_HEAD;
507
508         READ_BUF(4);
509         READ32(link->li_namelen);
510         READ_BUF(link->li_namelen);
511         SAVEMEM(link->li_name, link->li_namelen);
512         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
513                 return status;
514
515         DECODE_TAIL;
516 }
517
518 static __be32
519 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
520 {
521         DECODE_HEAD;
522
523         lock->lk_replay_owner = NULL;
524         /*
525         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
526         */
527         READ_BUF(28);
528         READ32(lock->lk_type);
529         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
530                 goto xdr_error;
531         READ32(lock->lk_reclaim);
532         READ64(lock->lk_offset);
533         READ64(lock->lk_length);
534         READ32(lock->lk_is_new);
535
536         if (lock->lk_is_new) {
537                 READ_BUF(4);
538                 READ32(lock->lk_new_open_seqid);
539                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
540                 if (status)
541                         return status;
542                 READ_BUF(8 + sizeof(clientid_t));
543                 READ32(lock->lk_new_lock_seqid);
544                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
545                 READ32(lock->lk_new_owner.len);
546                 READ_BUF(lock->lk_new_owner.len);
547                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
548         } else {
549                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
550                 if (status)
551                         return status;
552                 READ_BUF(4);
553                 READ32(lock->lk_old_lock_seqid);
554         }
555
556         DECODE_TAIL;
557 }
558
559 static __be32
560 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
561 {
562         DECODE_HEAD;
563                         
564         READ_BUF(32);
565         READ32(lockt->lt_type);
566         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
567                 goto xdr_error;
568         READ64(lockt->lt_offset);
569         READ64(lockt->lt_length);
570         COPYMEM(&lockt->lt_clientid, 8);
571         READ32(lockt->lt_owner.len);
572         READ_BUF(lockt->lt_owner.len);
573         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
574
575         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
576                 return nfserr_inval;
577         DECODE_TAIL;
578 }
579
580 static __be32
581 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
582 {
583         DECODE_HEAD;
584
585         locku->lu_stateowner = NULL;
586         READ_BUF(8);
587         READ32(locku->lu_type);
588         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
589                 goto xdr_error;
590         READ32(locku->lu_seqid);
591         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
592         if (status)
593                 return status;
594         READ_BUF(16);
595         READ64(locku->lu_offset);
596         READ64(locku->lu_length);
597
598         DECODE_TAIL;
599 }
600
601 static __be32
602 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
603 {
604         DECODE_HEAD;
605
606         READ_BUF(4);
607         READ32(lookup->lo_len);
608         READ_BUF(lookup->lo_len);
609         SAVEMEM(lookup->lo_name, lookup->lo_len);
610         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
611                 return status;
612
613         DECODE_TAIL;
614 }
615
616 static __be32
617 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
618 {
619         DECODE_HEAD;
620
621         memset(open->op_bmval, 0, sizeof(open->op_bmval));
622         open->op_iattr.ia_valid = 0;
623         open->op_stateowner = NULL;
624
625         /* seqid, share_access, share_deny, clientid, ownerlen */
626         READ_BUF(16 + sizeof(clientid_t));
627         READ32(open->op_seqid);
628         READ32(open->op_share_access);
629         READ32(open->op_share_deny);
630         COPYMEM(&open->op_clientid, sizeof(clientid_t));
631         READ32(open->op_owner.len);
632
633         /* owner, open_flag */
634         READ_BUF(open->op_owner.len + 4);
635         SAVEMEM(open->op_owner.data, open->op_owner.len);
636         READ32(open->op_create);
637         switch (open->op_create) {
638         case NFS4_OPEN_NOCREATE:
639                 break;
640         case NFS4_OPEN_CREATE:
641                 READ_BUF(4);
642                 READ32(open->op_createmode);
643                 switch (open->op_createmode) {
644                 case NFS4_CREATE_UNCHECKED:
645                 case NFS4_CREATE_GUARDED:
646                         status = nfsd4_decode_fattr(argp, open->op_bmval,
647                                 &open->op_iattr, &open->op_acl);
648                         if (status)
649                                 goto out;
650                         break;
651                 case NFS4_CREATE_EXCLUSIVE:
652                         READ_BUF(8);
653                         COPYMEM(open->op_verf.data, 8);
654                         break;
655                 case NFS4_CREATE_EXCLUSIVE4_1:
656                         if (argp->minorversion < 1)
657                                 goto xdr_error;
658                         READ_BUF(8);
659                         COPYMEM(open->op_verf.data, 8);
660                         status = nfsd4_decode_fattr(argp, open->op_bmval,
661                                 &open->op_iattr, &open->op_acl);
662                         if (status)
663                                 goto out;
664                         break;
665                 default:
666                         goto xdr_error;
667                 }
668                 break;
669         default:
670                 goto xdr_error;
671         }
672
673         /* open_claim */
674         READ_BUF(4);
675         READ32(open->op_claim_type);
676         switch (open->op_claim_type) {
677         case NFS4_OPEN_CLAIM_NULL:
678         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
679                 READ_BUF(4);
680                 READ32(open->op_fname.len);
681                 READ_BUF(open->op_fname.len);
682                 SAVEMEM(open->op_fname.data, open->op_fname.len);
683                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
684                         return status;
685                 break;
686         case NFS4_OPEN_CLAIM_PREVIOUS:
687                 READ_BUF(4);
688                 READ32(open->op_delegate_type);
689                 break;
690         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
691                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
692                 if (status)
693                         return status;
694                 READ_BUF(4);
695                 READ32(open->op_fname.len);
696                 READ_BUF(open->op_fname.len);
697                 SAVEMEM(open->op_fname.data, open->op_fname.len);
698                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
699                         return status;
700                 break;
701         default:
702                 goto xdr_error;
703         }
704
705         DECODE_TAIL;
706 }
707
708 static __be32
709 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
710 {
711         DECODE_HEAD;
712                     
713         open_conf->oc_stateowner = NULL;
714         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
715         if (status)
716                 return status;
717         READ_BUF(4);
718         READ32(open_conf->oc_seqid);
719                                                         
720         DECODE_TAIL;
721 }
722
723 static __be32
724 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
725 {
726         DECODE_HEAD;
727                     
728         open_down->od_stateowner = NULL;
729         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
730         if (status)
731                 return status;
732         READ_BUF(12);
733         READ32(open_down->od_seqid);
734         READ32(open_down->od_share_access);
735         READ32(open_down->od_share_deny);
736                                                         
737         DECODE_TAIL;
738 }
739
740 static __be32
741 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
742 {
743         DECODE_HEAD;
744
745         READ_BUF(4);
746         READ32(putfh->pf_fhlen);
747         if (putfh->pf_fhlen > NFS4_FHSIZE)
748                 goto xdr_error;
749         READ_BUF(putfh->pf_fhlen);
750         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
751
752         DECODE_TAIL;
753 }
754
755 static __be32
756 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
757 {
758         DECODE_HEAD;
759
760         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
761         if (status)
762                 return status;
763         READ_BUF(12);
764         READ64(read->rd_offset);
765         READ32(read->rd_length);
766
767         DECODE_TAIL;
768 }
769
770 static __be32
771 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
772 {
773         DECODE_HEAD;
774
775         READ_BUF(24);
776         READ64(readdir->rd_cookie);
777         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
778         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
779         READ32(readdir->rd_maxcount);
780         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
781                 goto out;
782
783         DECODE_TAIL;
784 }
785
786 static __be32
787 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
788 {
789         DECODE_HEAD;
790
791         READ_BUF(4);
792         READ32(remove->rm_namelen);
793         READ_BUF(remove->rm_namelen);
794         SAVEMEM(remove->rm_name, remove->rm_namelen);
795         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
796                 return status;
797
798         DECODE_TAIL;
799 }
800
801 static __be32
802 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
803 {
804         DECODE_HEAD;
805
806         READ_BUF(4);
807         READ32(rename->rn_snamelen);
808         READ_BUF(rename->rn_snamelen + 4);
809         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
810         READ32(rename->rn_tnamelen);
811         READ_BUF(rename->rn_tnamelen);
812         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
813         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
814                 return status;
815         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
816                 return status;
817
818         DECODE_TAIL;
819 }
820
821 static __be32
822 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
823 {
824         DECODE_HEAD;
825
826         READ_BUF(sizeof(clientid_t));
827         COPYMEM(clientid, sizeof(clientid_t));
828
829         DECODE_TAIL;
830 }
831
832 static __be32
833 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
834                      struct nfsd4_secinfo *secinfo)
835 {
836         DECODE_HEAD;
837
838         READ_BUF(4);
839         READ32(secinfo->si_namelen);
840         READ_BUF(secinfo->si_namelen);
841         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
842         status = check_filename(secinfo->si_name, secinfo->si_namelen,
843                                                                 nfserr_noent);
844         if (status)
845                 return status;
846         DECODE_TAIL;
847 }
848
849 static __be32
850 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
851 {
852         __be32 status;
853
854         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
855         if (status)
856                 return status;
857         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
858                                   &setattr->sa_acl);
859 }
860
861 static __be32
862 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
863 {
864         DECODE_HEAD;
865
866         READ_BUF(12);
867         COPYMEM(setclientid->se_verf.data, 8);
868         READ32(setclientid->se_namelen);
869
870         READ_BUF(setclientid->se_namelen + 8);
871         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
872         READ32(setclientid->se_callback_prog);
873         READ32(setclientid->se_callback_netid_len);
874
875         READ_BUF(setclientid->se_callback_netid_len + 4);
876         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
877         READ32(setclientid->se_callback_addr_len);
878
879         READ_BUF(setclientid->se_callback_addr_len + 4);
880         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
881         READ32(setclientid->se_callback_ident);
882
883         DECODE_TAIL;
884 }
885
886 static __be32
887 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
888 {
889         DECODE_HEAD;
890
891         READ_BUF(8 + sizeof(nfs4_verifier));
892         COPYMEM(&scd_c->sc_clientid, 8);
893         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
894
895         DECODE_TAIL;
896 }
897
898 /* Also used for NVERIFY */
899 static __be32
900 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
901 {
902 #if 0
903         struct nfsd4_compoundargs save = {
904                 .p = argp->p,
905                 .end = argp->end,
906                 .rqstp = argp->rqstp,
907         };
908         u32             ve_bmval[2];
909         struct iattr    ve_iattr;           /* request */
910         struct nfs4_acl *ve_acl;            /* request */
911 #endif
912         DECODE_HEAD;
913
914         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
915                 goto out;
916
917         /* For convenience's sake, we compare raw xdr'd attributes in
918          * nfsd4_proc_verify; however we still decode here just to return
919          * correct error in case of bad xdr. */
920 #if 0
921         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
922         if (status == nfserr_inval) {
923                 status = nfserrno(status);
924                 goto out;
925         }
926 #endif
927         READ_BUF(4);
928         READ32(verify->ve_attrlen);
929         READ_BUF(verify->ve_attrlen);
930         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
931
932         DECODE_TAIL;
933 }
934
935 static __be32
936 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
937 {
938         int avail;
939         int v;
940         int len;
941         DECODE_HEAD;
942
943         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
944         if (status)
945                 return status;
946         READ_BUF(16);
947         READ64(write->wr_offset);
948         READ32(write->wr_stable_how);
949         if (write->wr_stable_how > 2)
950                 goto xdr_error;
951         READ32(write->wr_buflen);
952
953         /* Sorry .. no magic macros for this.. *
954          * READ_BUF(write->wr_buflen);
955          * SAVEMEM(write->wr_buf, write->wr_buflen);
956          */
957         avail = (char*)argp->end - (char*)argp->p;
958         if (avail + argp->pagelen < write->wr_buflen) {
959                 dprintk("NFSD: xdr error (%s:%d)\n",
960                                 __FILE__, __LINE__);
961                 goto xdr_error;
962         }
963         argp->rqstp->rq_vec[0].iov_base = p;
964         argp->rqstp->rq_vec[0].iov_len = avail;
965         v = 0;
966         len = write->wr_buflen;
967         while (len > argp->rqstp->rq_vec[v].iov_len) {
968                 len -= argp->rqstp->rq_vec[v].iov_len;
969                 v++;
970                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
971                 argp->pagelist++;
972                 if (argp->pagelen >= PAGE_SIZE) {
973                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
974                         argp->pagelen -= PAGE_SIZE;
975                 } else {
976                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
977                         argp->pagelen -= len;
978                 }
979         }
980         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
981         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
982         argp->rqstp->rq_vec[v].iov_len = len;
983         write->wr_vlen = v+1;
984
985         DECODE_TAIL;
986 }
987
988 static __be32
989 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
990 {
991         DECODE_HEAD;
992
993         READ_BUF(12);
994         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
995         READ32(rlockowner->rl_owner.len);
996         READ_BUF(rlockowner->rl_owner.len);
997         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
998
999         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1000                 return nfserr_inval;
1001         DECODE_TAIL;
1002 }
1003
1004 static __be32
1005 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1006                          struct nfsd4_exchange_id *exid)
1007 {
1008         int dummy;
1009         DECODE_HEAD;
1010
1011         READ_BUF(NFS4_VERIFIER_SIZE);
1012         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1013
1014         READ_BUF(4);
1015         READ32(exid->clname.len);
1016
1017         READ_BUF(exid->clname.len);
1018         SAVEMEM(exid->clname.data, exid->clname.len);
1019
1020         READ_BUF(4);
1021         READ32(exid->flags);
1022
1023         /* Ignore state_protect4_a */
1024         READ_BUF(4);
1025         READ32(exid->spa_how);
1026         switch (exid->spa_how) {
1027         case SP4_NONE:
1028                 break;
1029         case SP4_MACH_CRED:
1030                 /* spo_must_enforce */
1031                 READ_BUF(4);
1032                 READ32(dummy);
1033                 READ_BUF(dummy * 4);
1034                 p += dummy;
1035
1036                 /* spo_must_allow */
1037                 READ_BUF(4);
1038                 READ32(dummy);
1039                 READ_BUF(dummy * 4);
1040                 p += dummy;
1041                 break;
1042         case SP4_SSV:
1043                 /* ssp_ops */
1044                 READ_BUF(4);
1045                 READ32(dummy);
1046                 READ_BUF(dummy * 4);
1047                 p += dummy;
1048
1049                 READ_BUF(4);
1050                 READ32(dummy);
1051                 READ_BUF(dummy * 4);
1052                 p += dummy;
1053
1054                 /* ssp_hash_algs<> */
1055                 READ_BUF(4);
1056                 READ32(dummy);
1057                 READ_BUF(dummy);
1058                 p += XDR_QUADLEN(dummy);
1059
1060                 /* ssp_encr_algs<> */
1061                 READ_BUF(4);
1062                 READ32(dummy);
1063                 READ_BUF(dummy);
1064                 p += XDR_QUADLEN(dummy);
1065
1066                 /* ssp_window and ssp_num_gss_handles */
1067                 READ_BUF(8);
1068                 READ32(dummy);
1069                 READ32(dummy);
1070                 break;
1071         default:
1072                 goto xdr_error;
1073         }
1074
1075         /* Ignore Implementation ID */
1076         READ_BUF(4);    /* nfs_impl_id4 array length */
1077         READ32(dummy);
1078
1079         if (dummy > 1)
1080                 goto xdr_error;
1081
1082         if (dummy == 1) {
1083                 /* nii_domain */
1084                 READ_BUF(4);
1085                 READ32(dummy);
1086                 READ_BUF(dummy);
1087                 p += XDR_QUADLEN(dummy);
1088
1089                 /* nii_name */
1090                 READ_BUF(4);
1091                 READ32(dummy);
1092                 READ_BUF(dummy);
1093                 p += XDR_QUADLEN(dummy);
1094
1095                 /* nii_date */
1096                 READ_BUF(12);
1097                 p += 3;
1098         }
1099         DECODE_TAIL;
1100 }
1101
1102 static __be32
1103 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1104                             struct nfsd4_create_session *sess)
1105 {
1106         DECODE_HEAD;
1107
1108         u32 dummy;
1109         char *machine_name;
1110         int i;
1111         int nr_secflavs;
1112
1113         READ_BUF(16);
1114         COPYMEM(&sess->clientid, 8);
1115         READ32(sess->seqid);
1116         READ32(sess->flags);
1117
1118         /* Fore channel attrs */
1119         READ_BUF(28);
1120         READ32(dummy); /* headerpadsz is always 0 */
1121         READ32(sess->fore_channel.maxreq_sz);
1122         READ32(sess->fore_channel.maxresp_sz);
1123         READ32(sess->fore_channel.maxresp_cached);
1124         READ32(sess->fore_channel.maxops);
1125         READ32(sess->fore_channel.maxreqs);
1126         READ32(sess->fore_channel.nr_rdma_attrs);
1127         if (sess->fore_channel.nr_rdma_attrs == 1) {
1128                 READ_BUF(4);
1129                 READ32(sess->fore_channel.rdma_attrs);
1130         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1131                 dprintk("Too many fore channel attr bitmaps!\n");
1132                 goto xdr_error;
1133         }
1134
1135         /* Back channel attrs */
1136         READ_BUF(28);
1137         READ32(dummy); /* headerpadsz is always 0 */
1138         READ32(sess->back_channel.maxreq_sz);
1139         READ32(sess->back_channel.maxresp_sz);
1140         READ32(sess->back_channel.maxresp_cached);
1141         READ32(sess->back_channel.maxops);
1142         READ32(sess->back_channel.maxreqs);
1143         READ32(sess->back_channel.nr_rdma_attrs);
1144         if (sess->back_channel.nr_rdma_attrs == 1) {
1145                 READ_BUF(4);
1146                 READ32(sess->back_channel.rdma_attrs);
1147         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1148                 dprintk("Too many back channel attr bitmaps!\n");
1149                 goto xdr_error;
1150         }
1151
1152         READ_BUF(8);
1153         READ32(sess->callback_prog);
1154
1155         /* callback_sec_params4 */
1156         READ32(nr_secflavs);
1157         for (i = 0; i < nr_secflavs; ++i) {
1158                 READ_BUF(4);
1159                 READ32(dummy);
1160                 switch (dummy) {
1161                 case RPC_AUTH_NULL:
1162                         /* Nothing to read */
1163                         break;
1164                 case RPC_AUTH_UNIX:
1165                         READ_BUF(8);
1166                         /* stamp */
1167                         READ32(dummy);
1168
1169                         /* machine name */
1170                         READ32(dummy);
1171                         READ_BUF(dummy);
1172                         SAVEMEM(machine_name, dummy);
1173
1174                         /* uid, gid */
1175                         READ_BUF(8);
1176                         READ32(sess->uid);
1177                         READ32(sess->gid);
1178
1179                         /* more gids */
1180                         READ_BUF(4);
1181                         READ32(dummy);
1182                         READ_BUF(dummy * 4);
1183                         for (i = 0; i < dummy; ++i)
1184                                 READ32(dummy);
1185                         break;
1186                 case RPC_AUTH_GSS:
1187                         dprintk("RPC_AUTH_GSS callback secflavor "
1188                                 "not supported!\n");
1189                         READ_BUF(8);
1190                         /* gcbp_service */
1191                         READ32(dummy);
1192                         /* gcbp_handle_from_server */
1193                         READ32(dummy);
1194                         READ_BUF(dummy);
1195                         p += XDR_QUADLEN(dummy);
1196                         /* gcbp_handle_from_client */
1197                         READ_BUF(4);
1198                         READ32(dummy);
1199                         READ_BUF(dummy);
1200                         p += XDR_QUADLEN(dummy);
1201                         break;
1202                 default:
1203                         dprintk("Illegal callback secflavor\n");
1204                         return nfserr_inval;
1205                 }
1206         }
1207         DECODE_TAIL;
1208 }
1209
1210 static __be32
1211 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1212                              struct nfsd4_destroy_session *destroy_session)
1213 {
1214         DECODE_HEAD;
1215         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1216         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1217
1218         DECODE_TAIL;
1219 }
1220
1221 static __be32
1222 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1223                       struct nfsd4_sequence *seq)
1224 {
1225         DECODE_HEAD;
1226
1227         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1228         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1229         READ32(seq->seqid);
1230         READ32(seq->slotid);
1231         READ32(seq->maxslots);
1232         READ32(seq->cachethis);
1233
1234         DECODE_TAIL;
1235 }
1236
1237 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1238 {
1239         DECODE_HEAD;
1240
1241         READ_BUF(4);
1242         READ32(rc->rca_one_fs);
1243
1244         DECODE_TAIL;
1245 }
1246
1247 static __be32
1248 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1249 {
1250         return nfs_ok;
1251 }
1252
1253 static __be32
1254 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1255 {
1256         return nfserr_notsupp;
1257 }
1258
1259 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1260
1261 static nfsd4_dec nfsd4_dec_ops[] = {
1262         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1263         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1264         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1265         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1266         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1267         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1268         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1269         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1270         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1271         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1272         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1273         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1274         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1275         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1276         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1277         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1278         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1279         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1280         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1281         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1282         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1283         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1284         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1285         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1286         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1287         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1288         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1289         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1290         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1291         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1292         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1293         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1294         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1295         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1296         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1297         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1298         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1299 };
1300
1301 static nfsd4_dec nfsd41_dec_ops[] = {
1302         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1303         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1304         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1305         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1306         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1307         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1308         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1309         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1310         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1311         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1312         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1313         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1314         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1315         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1316         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1317         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1318         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1319         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1320         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1321         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1322         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1323         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1324         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1325         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1326         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1327         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1328         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1329         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1330         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1331         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1332         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1333         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1334         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1335         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1336         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1337         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1338         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1339
1340         /* new operations for NFSv4.1 */
1341         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1342         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
1343         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1344         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1345         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1346         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1347         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1348         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1349         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1350         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1351         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1352         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1353         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_notsupp,
1354         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1355         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1356         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1357         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1358         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1359         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1360 };
1361
1362 struct nfsd4_minorversion_ops {
1363         nfsd4_dec *decoders;
1364         int nops;
1365 };
1366
1367 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1368         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1369         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1370 };
1371
1372 static __be32
1373 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1374 {
1375         DECODE_HEAD;
1376         struct nfsd4_op *op;
1377         struct nfsd4_minorversion_ops *ops;
1378         int i;
1379
1380         /*
1381          * XXX: According to spec, we should check the tag
1382          * for UTF-8 compliance.  I'm postponing this for
1383          * now because it seems that some clients do use
1384          * binary tags.
1385          */
1386         READ_BUF(4);
1387         READ32(argp->taglen);
1388         READ_BUF(argp->taglen + 8);
1389         SAVEMEM(argp->tag, argp->taglen);
1390         READ32(argp->minorversion);
1391         READ32(argp->opcnt);
1392
1393         if (argp->taglen > NFSD4_MAX_TAGLEN)
1394                 goto xdr_error;
1395         if (argp->opcnt > 100)
1396                 goto xdr_error;
1397
1398         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1399                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1400                 if (!argp->ops) {
1401                         argp->ops = argp->iops;
1402                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1403                         goto xdr_error;
1404                 }
1405         }
1406
1407         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1408                 argp->opcnt = 0;
1409
1410         ops = &nfsd4_minorversion[argp->minorversion];
1411         for (i = 0; i < argp->opcnt; i++) {
1412                 op = &argp->ops[i];
1413                 op->replay = NULL;
1414
1415                 /*
1416                  * We can't use READ_BUF() here because we need to handle
1417                  * a missing opcode as an OP_WRITE + 1. So we need to check
1418                  * to see if we're truly at the end of our buffer or if there
1419                  * is another page we need to flip to.
1420                  */
1421
1422                 if (argp->p == argp->end) {
1423                         if (argp->pagelen < 4) {
1424                                 /* There isn't an opcode still on the wire */
1425                                 op->opnum = OP_WRITE + 1;
1426                                 op->status = nfserr_bad_xdr;
1427                                 argp->opcnt = i+1;
1428                                 break;
1429                         }
1430
1431                         /*
1432                          * False alarm. We just hit a page boundary, but there
1433                          * is still data available.  Move pointer across page
1434                          * boundary.  *snip from READ_BUF*
1435                          */
1436                         argp->p = page_address(argp->pagelist[0]);
1437                         argp->pagelist++;
1438                         if (argp->pagelen < PAGE_SIZE) {
1439                                 argp->end = argp->p + (argp->pagelen>>2);
1440                                 argp->pagelen = 0;
1441                         } else {
1442                                 argp->end = argp->p + (PAGE_SIZE>>2);
1443                                 argp->pagelen -= PAGE_SIZE;
1444                         }
1445                 }
1446                 op->opnum = ntohl(*argp->p++);
1447
1448                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1449                         op->status = ops->decoders[op->opnum](argp, &op->u);
1450                 else {
1451                         op->opnum = OP_ILLEGAL;
1452                         op->status = nfserr_op_illegal;
1453                 }
1454
1455                 if (op->status) {
1456                         argp->opcnt = i+1;
1457                         break;
1458                 }
1459         }
1460
1461         DECODE_TAIL;
1462 }
1463
1464 #define WRITE32(n)               *p++ = htonl(n)
1465 #define WRITE64(n)               do {                           \
1466         *p++ = htonl((u32)((n) >> 32));                         \
1467         *p++ = htonl((u32)(n));                                 \
1468 } while (0)
1469 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1470         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1471         memcpy(p, ptr, nbytes);                                 \
1472         p += XDR_QUADLEN(nbytes);                               \
1473 }} while (0)
1474
1475 static void write32(__be32 **p, u32 n)
1476 {
1477         *(*p)++ = n;
1478 }
1479
1480 static void write64(__be32 **p, u64 n)
1481 {
1482         write32(p, (u32)(n >> 32));
1483         write32(p, (u32)n);
1484 }
1485
1486 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1487 {
1488         if (IS_I_VERSION(inode)) {
1489                 write64(p, inode->i_version);
1490         } else {
1491                 write32(p, stat->ctime.tv_sec);
1492                 write32(p, stat->ctime.tv_nsec);
1493         }
1494 }
1495
1496 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1497 {
1498         write32(p, c->atomic);
1499         if (c->change_supported) {
1500                 write64(p, c->before_change);
1501                 write64(p, c->after_change);
1502         } else {
1503                 write32(p, c->before_ctime_sec);
1504                 write32(p, c->before_ctime_nsec);
1505                 write32(p, c->after_ctime_sec);
1506                 write32(p, c->after_ctime_nsec);
1507         }
1508 }
1509
1510 #define RESERVE_SPACE(nbytes)   do {                            \
1511         p = resp->p;                                            \
1512         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1513 } while (0)
1514 #define ADJUST_ARGS()           resp->p = p
1515
1516 /*
1517  * Header routine to setup seqid operation replay cache
1518  */
1519 #define ENCODE_SEQID_OP_HEAD                                    \
1520         __be32 *save;                                           \
1521                                                                 \
1522         save = resp->p;
1523
1524 /*
1525  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1526  * is where sequence id's are incremented, and the replay cache is filled.
1527  * Note that we increment sequence id's here, at the last moment, so we're sure
1528  * we know whether the error to be returned is a sequence id mutating error.
1529  */
1530
1531 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1532         if (seqid_mutating_err(nfserr) && stateowner) {         \
1533                 stateowner->so_seqid++;                         \
1534                 stateowner->so_replay.rp_status = nfserr;       \
1535                 stateowner->so_replay.rp_buflen =               \
1536                           (((char *)(resp)->p - (char *)save)); \
1537                 memcpy(stateowner->so_replay.rp_buf, save,      \
1538                         stateowner->so_replay.rp_buflen);       \
1539         } } while (0);
1540
1541 /* Encode as an array of strings the string given with components
1542  * separated @sep.
1543  */
1544 static __be32 nfsd4_encode_components(char sep, char *components,
1545                                    __be32 **pp, int *buflen)
1546 {
1547         __be32 *p = *pp;
1548         __be32 *countp = p;
1549         int strlen, count=0;
1550         char *str, *end;
1551
1552         dprintk("nfsd4_encode_components(%s)\n", components);
1553         if ((*buflen -= 4) < 0)
1554                 return nfserr_resource;
1555         WRITE32(0); /* We will fill this in with @count later */
1556         end = str = components;
1557         while (*end) {
1558                 for (; *end && (*end != sep); end++)
1559                         ; /* Point to end of component */
1560                 strlen = end - str;
1561                 if (strlen) {
1562                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1563                                 return nfserr_resource;
1564                         WRITE32(strlen);
1565                         WRITEMEM(str, strlen);
1566                         count++;
1567                 }
1568                 else
1569                         end++;
1570                 str = end;
1571         }
1572         *pp = p;
1573         p = countp;
1574         WRITE32(count);
1575         return 0;
1576 }
1577
1578 /*
1579  * encode a location element of a fs_locations structure
1580  */
1581 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1582                                     __be32 **pp, int *buflen)
1583 {
1584         __be32 status;
1585         __be32 *p = *pp;
1586
1587         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1588         if (status)
1589                 return status;
1590         status = nfsd4_encode_components('/', location->path, &p, buflen);
1591         if (status)
1592                 return status;
1593         *pp = p;
1594         return 0;
1595 }
1596
1597 /*
1598  * Return the path to an export point in the pseudo filesystem namespace
1599  * Returned string is safe to use as long as the caller holds a reference
1600  * to @exp.
1601  */
1602 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1603 {
1604         struct svc_fh tmp_fh;
1605         char *path = NULL, *rootpath;
1606         size_t rootlen;
1607
1608         fh_init(&tmp_fh, NFS4_FHSIZE);
1609         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1610         if (*stat)
1611                 return NULL;
1612         rootpath = tmp_fh.fh_export->ex_pathname;
1613
1614         path = exp->ex_pathname;
1615
1616         rootlen = strlen(rootpath);
1617         if (strncmp(path, rootpath, rootlen)) {
1618                 dprintk("nfsd: fs_locations failed;"
1619                         "%s is not contained in %s\n", path, rootpath);
1620                 *stat = nfserr_notsupp;
1621                 path = NULL;
1622                 goto out;
1623         }
1624         path += rootlen;
1625 out:
1626         fh_put(&tmp_fh);
1627         return path;
1628 }
1629
1630 /*
1631  *  encode a fs_locations structure
1632  */
1633 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1634                                      struct svc_export *exp,
1635                                      __be32 **pp, int *buflen)
1636 {
1637         __be32 status;
1638         int i;
1639         __be32 *p = *pp;
1640         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1641         char *root = nfsd4_path(rqstp, exp, &status);
1642
1643         if (status)
1644                 return status;
1645         status = nfsd4_encode_components('/', root, &p, buflen);
1646         if (status)
1647                 return status;
1648         if ((*buflen -= 4) < 0)
1649                 return nfserr_resource;
1650         WRITE32(fslocs->locations_count);
1651         for (i=0; i<fslocs->locations_count; i++) {
1652                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1653                                                    &p, buflen);
1654                 if (status)
1655                         return status;
1656         }
1657         *pp = p;
1658         return 0;
1659 }
1660
1661 static u32 nfs4_ftypes[16] = {
1662         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1663         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1664         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1665         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1666 };
1667
1668 static __be32
1669 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1670                         __be32 **p, int *buflen)
1671 {
1672         int status;
1673
1674         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1675                 return nfserr_resource;
1676         if (whotype != NFS4_ACL_WHO_NAMED)
1677                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1678         else if (group)
1679                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1680         else
1681                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1682         if (status < 0)
1683                 return nfserrno(status);
1684         *p = xdr_encode_opaque(*p, NULL, status);
1685         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1686         BUG_ON(*buflen < 0);
1687         return 0;
1688 }
1689
1690 static inline __be32
1691 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1692 {
1693         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1694 }
1695
1696 static inline __be32
1697 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1698 {
1699         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1700 }
1701
1702 static inline __be32
1703 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1704                 __be32 **p, int *buflen)
1705 {
1706         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1707 }
1708
1709 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1710                               FATTR4_WORD0_RDATTR_ERROR)
1711 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1712
1713 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1714 {
1715         /* As per referral draft:  */
1716         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1717             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1718                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1719                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1720                         *rdattr_err = NFSERR_MOVED;
1721                 else
1722                         return nfserr_moved;
1723         }
1724         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1725         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1726         return 0;
1727 }
1728
1729 /*
1730  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1731  * ourselves.
1732  *
1733  * @countp is the buffer size in _words_; upon successful return this becomes
1734  * replaced with the number of words written.
1735  */
1736 __be32
1737 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1738                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1739                 struct svc_rqst *rqstp, int ignore_crossmnt)
1740 {
1741         u32 bmval0 = bmval[0];
1742         u32 bmval1 = bmval[1];
1743         u32 bmval2 = bmval[2];
1744         struct kstat stat;
1745         struct svc_fh tempfh;
1746         struct kstatfs statfs;
1747         int buflen = *countp << 2;
1748         __be32 *attrlenp;
1749         u32 dummy;
1750         u64 dummy64;
1751         u32 rdattr_err = 0;
1752         __be32 *p = buffer;
1753         __be32 status;
1754         int err;
1755         int aclsupport = 0;
1756         struct nfs4_acl *acl = NULL;
1757         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1758         u32 minorversion = resp->cstate.minorversion;
1759
1760         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1761         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1762         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1763         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1764
1765         if (exp->ex_fslocs.migrated) {
1766                 BUG_ON(bmval[2]);
1767                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1768                 if (status)
1769                         goto out;
1770         }
1771
1772         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1773         if (err)
1774                 goto out_nfserr;
1775         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1776                         FATTR4_WORD0_MAXNAME)) ||
1777             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1778                        FATTR4_WORD1_SPACE_TOTAL))) {
1779                 err = vfs_statfs(dentry, &statfs);
1780                 if (err)
1781                         goto out_nfserr;
1782         }
1783         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1784                 fh_init(&tempfh, NFS4_FHSIZE);
1785                 status = fh_compose(&tempfh, exp, dentry, NULL);
1786                 if (status)
1787                         goto out;
1788                 fhp = &tempfh;
1789         }
1790         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1791                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1792                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1793                 aclsupport = (err == 0);
1794                 if (bmval0 & FATTR4_WORD0_ACL) {
1795                         if (err == -EOPNOTSUPP)
1796                                 bmval0 &= ~FATTR4_WORD0_ACL;
1797                         else if (err == -EINVAL) {
1798                                 status = nfserr_attrnotsupp;
1799                                 goto out;
1800                         } else if (err != 0)
1801                                 goto out_nfserr;
1802                 }
1803         }
1804         if ((buflen -= 16) < 0)
1805                 goto out_resource;
1806
1807         if (unlikely(bmval2)) {
1808                 WRITE32(3);
1809                 WRITE32(bmval0);
1810                 WRITE32(bmval1);
1811                 WRITE32(bmval2);
1812         } else if (likely(bmval1)) {
1813                 WRITE32(2);
1814                 WRITE32(bmval0);
1815                 WRITE32(bmval1);
1816         } else {
1817                 WRITE32(1);
1818                 WRITE32(bmval0);
1819         }
1820         attrlenp = p++;                /* to be backfilled later */
1821
1822         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1823                 u32 word0 = nfsd_suppattrs0(minorversion);
1824                 u32 word1 = nfsd_suppattrs1(minorversion);
1825                 u32 word2 = nfsd_suppattrs2(minorversion);
1826
1827                 if ((buflen -= 12) < 0)
1828                         goto out_resource;
1829                 if (!aclsupport)
1830                         word0 &= ~FATTR4_WORD0_ACL;
1831                 if (!word2) {
1832                         WRITE32(2);
1833                         WRITE32(word0);
1834                         WRITE32(word1);
1835                 } else {
1836                         WRITE32(3);
1837                         WRITE32(word0);
1838                         WRITE32(word1);
1839                         WRITE32(word2);
1840                 }
1841         }
1842         if (bmval0 & FATTR4_WORD0_TYPE) {
1843                 if ((buflen -= 4) < 0)
1844                         goto out_resource;
1845                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1846                 if (dummy == NF4BAD)
1847                         goto out_serverfault;
1848                 WRITE32(dummy);
1849         }
1850         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1851                 if ((buflen -= 4) < 0)
1852                         goto out_resource;
1853                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1854                         WRITE32(NFS4_FH_PERSISTENT);
1855                 else
1856                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1857         }
1858         if (bmval0 & FATTR4_WORD0_CHANGE) {
1859                 if ((buflen -= 8) < 0)
1860                         goto out_resource;
1861                 write_change(&p, &stat, dentry->d_inode);
1862         }
1863         if (bmval0 & FATTR4_WORD0_SIZE) {
1864                 if ((buflen -= 8) < 0)
1865                         goto out_resource;
1866                 WRITE64(stat.size);
1867         }
1868         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1869                 if ((buflen -= 4) < 0)
1870                         goto out_resource;
1871                 WRITE32(1);
1872         }
1873         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1874                 if ((buflen -= 4) < 0)
1875                         goto out_resource;
1876                 WRITE32(1);
1877         }
1878         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1879                 if ((buflen -= 4) < 0)
1880                         goto out_resource;
1881                 WRITE32(0);
1882         }
1883         if (bmval0 & FATTR4_WORD0_FSID) {
1884                 if ((buflen -= 16) < 0)
1885                         goto out_resource;
1886                 if (exp->ex_fslocs.migrated) {
1887                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1888                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1889                 } else switch(fsid_source(fhp)) {
1890                 case FSIDSOURCE_FSID:
1891                         WRITE64((u64)exp->ex_fsid);
1892                         WRITE64((u64)0);
1893                         break;
1894                 case FSIDSOURCE_DEV:
1895                         WRITE32(0);
1896                         WRITE32(MAJOR(stat.dev));
1897                         WRITE32(0);
1898                         WRITE32(MINOR(stat.dev));
1899                         break;
1900                 case FSIDSOURCE_UUID:
1901                         WRITEMEM(exp->ex_uuid, 16);
1902                         break;
1903                 }
1904         }
1905         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1906                 if ((buflen -= 4) < 0)
1907                         goto out_resource;
1908                 WRITE32(0);
1909         }
1910         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1911                 if ((buflen -= 4) < 0)
1912                         goto out_resource;
1913                 WRITE32(nfsd4_lease);
1914         }
1915         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1916                 if ((buflen -= 4) < 0)
1917                         goto out_resource;
1918                 WRITE32(rdattr_err);
1919         }
1920         if (bmval0 & FATTR4_WORD0_ACL) {
1921                 struct nfs4_ace *ace;
1922
1923                 if (acl == NULL) {
1924                         if ((buflen -= 4) < 0)
1925                                 goto out_resource;
1926
1927                         WRITE32(0);
1928                         goto out_acl;
1929                 }
1930                 if ((buflen -= 4) < 0)
1931                         goto out_resource;
1932                 WRITE32(acl->naces);
1933
1934                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1935                         if ((buflen -= 4*3) < 0)
1936                                 goto out_resource;
1937                         WRITE32(ace->type);
1938                         WRITE32(ace->flag);
1939                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1940                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1941                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1942                                 &p, &buflen);
1943                         if (status == nfserr_resource)
1944                                 goto out_resource;
1945                         if (status)
1946                                 goto out;
1947                 }
1948         }
1949 out_acl:
1950         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1951                 if ((buflen -= 4) < 0)
1952                         goto out_resource;
1953                 WRITE32(aclsupport ?
1954                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1955         }
1956         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1957                 if ((buflen -= 4) < 0)
1958                         goto out_resource;
1959                 WRITE32(1);
1960         }
1961         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1962                 if ((buflen -= 4) < 0)
1963                         goto out_resource;
1964                 WRITE32(1);
1965         }
1966         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1967                 if ((buflen -= 4) < 0)
1968                         goto out_resource;
1969                 WRITE32(1);
1970         }
1971         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1972                 if ((buflen -= 4) < 0)
1973                         goto out_resource;
1974                 WRITE32(1);
1975         }
1976         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1977                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1978                 if (buflen < 0)
1979                         goto out_resource;
1980                 WRITE32(fhp->fh_handle.fh_size);
1981                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1982         }
1983         if (bmval0 & FATTR4_WORD0_FILEID) {
1984                 if ((buflen -= 8) < 0)
1985                         goto out_resource;
1986                 WRITE64(stat.ino);
1987         }
1988         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1989                 if ((buflen -= 8) < 0)
1990                         goto out_resource;
1991                 WRITE64((u64) statfs.f_ffree);
1992         }
1993         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1994                 if ((buflen -= 8) < 0)
1995                         goto out_resource;
1996                 WRITE64((u64) statfs.f_ffree);
1997         }
1998         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1999                 if ((buflen -= 8) < 0)
2000                         goto out_resource;
2001                 WRITE64((u64) statfs.f_files);
2002         }
2003         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2004                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2005                 if (status == nfserr_resource)
2006                         goto out_resource;
2007                 if (status)
2008                         goto out;
2009         }
2010         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2011                 if ((buflen -= 4) < 0)
2012                         goto out_resource;
2013                 WRITE32(1);
2014         }
2015         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2016                 if ((buflen -= 8) < 0)
2017                         goto out_resource;
2018                 WRITE64(~(u64)0);
2019         }
2020         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2021                 if ((buflen -= 4) < 0)
2022                         goto out_resource;
2023                 WRITE32(255);
2024         }
2025         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2026                 if ((buflen -= 4) < 0)
2027                         goto out_resource;
2028                 WRITE32(statfs.f_namelen);
2029         }
2030         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2031                 if ((buflen -= 8) < 0)
2032                         goto out_resource;
2033                 WRITE64((u64) svc_max_payload(rqstp));
2034         }
2035         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2036                 if ((buflen -= 8) < 0)
2037                         goto out_resource;
2038                 WRITE64((u64) svc_max_payload(rqstp));
2039         }
2040         if (bmval1 & FATTR4_WORD1_MODE) {
2041                 if ((buflen -= 4) < 0)
2042                         goto out_resource;
2043                 WRITE32(stat.mode & S_IALLUGO);
2044         }
2045         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2046                 if ((buflen -= 4) < 0)
2047                         goto out_resource;
2048                 WRITE32(1);
2049         }
2050         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2051                 if ((buflen -= 4) < 0)
2052                         goto out_resource;
2053                 WRITE32(stat.nlink);
2054         }
2055         if (bmval1 & FATTR4_WORD1_OWNER) {
2056                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2057                 if (status == nfserr_resource)
2058                         goto out_resource;
2059                 if (status)
2060                         goto out;
2061         }
2062         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2063                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2064                 if (status == nfserr_resource)
2065                         goto out_resource;
2066                 if (status)
2067                         goto out;
2068         }
2069         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2070                 if ((buflen -= 8) < 0)
2071                         goto out_resource;
2072                 WRITE32((u32) MAJOR(stat.rdev));
2073                 WRITE32((u32) MINOR(stat.rdev));
2074         }
2075         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2076                 if ((buflen -= 8) < 0)
2077                         goto out_resource;
2078                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2079                 WRITE64(dummy64);
2080         }
2081         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2082                 if ((buflen -= 8) < 0)
2083                         goto out_resource;
2084                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2085                 WRITE64(dummy64);
2086         }
2087         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2088                 if ((buflen -= 8) < 0)
2089                         goto out_resource;
2090                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2091                 WRITE64(dummy64);
2092         }
2093         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2094                 if ((buflen -= 8) < 0)
2095                         goto out_resource;
2096                 dummy64 = (u64)stat.blocks << 9;
2097                 WRITE64(dummy64);
2098         }
2099         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2100                 if ((buflen -= 12) < 0)
2101                         goto out_resource;
2102                 WRITE32(0);
2103                 WRITE32(stat.atime.tv_sec);
2104                 WRITE32(stat.atime.tv_nsec);
2105         }
2106         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2107                 if ((buflen -= 12) < 0)
2108                         goto out_resource;
2109                 WRITE32(0);
2110                 WRITE32(1);
2111                 WRITE32(0);
2112         }
2113         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2114                 if ((buflen -= 12) < 0)
2115                         goto out_resource;
2116                 WRITE32(0);
2117                 WRITE32(stat.ctime.tv_sec);
2118                 WRITE32(stat.ctime.tv_nsec);
2119         }
2120         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2121                 if ((buflen -= 12) < 0)
2122                         goto out_resource;
2123                 WRITE32(0);
2124                 WRITE32(stat.mtime.tv_sec);
2125                 WRITE32(stat.mtime.tv_nsec);
2126         }
2127         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2128                 if ((buflen -= 8) < 0)
2129                         goto out_resource;
2130                 /*
2131                  * Get parent's attributes if not ignoring crossmount
2132                  * and this is the root of a cross-mounted filesystem.
2133                  */
2134                 if (ignore_crossmnt == 0 &&
2135                     dentry == exp->ex_path.mnt->mnt_root) {
2136                         struct path path = exp->ex_path;
2137                         path_get(&path);
2138                         while (follow_up(&path)) {
2139                                 if (path.dentry != path.mnt->mnt_root)
2140                                         break;
2141                         }
2142                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2143                         path_put(&path);
2144                         if (err)
2145                                 goto out_nfserr;
2146                 }
2147                 WRITE64(stat.ino);
2148         }
2149         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2150                 WRITE32(3);
2151                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2152                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2153                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2154         }
2155
2156         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2157         *countp = p - buffer;
2158         status = nfs_ok;
2159
2160 out:
2161         kfree(acl);
2162         if (fhp == &tempfh)
2163                 fh_put(&tempfh);
2164         return status;
2165 out_nfserr:
2166         status = nfserrno(err);
2167         goto out;
2168 out_resource:
2169         *countp = 0;
2170         status = nfserr_resource;
2171         goto out;
2172 out_serverfault:
2173         status = nfserr_serverfault;
2174         goto out;
2175 }
2176
2177 static inline int attributes_need_mount(u32 *bmval)
2178 {
2179         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2180                 return 1;
2181         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2182                 return 1;
2183         return 0;
2184 }
2185
2186 static __be32
2187 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2188                 const char *name, int namlen, __be32 *p, int *buflen)
2189 {
2190         struct svc_export *exp = cd->rd_fhp->fh_export;
2191         struct dentry *dentry;
2192         __be32 nfserr;
2193         int ignore_crossmnt = 0;
2194
2195         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2196         if (IS_ERR(dentry))
2197                 return nfserrno(PTR_ERR(dentry));
2198         if (!dentry->d_inode) {
2199                 /*
2200                  * nfsd_buffered_readdir drops the i_mutex between
2201                  * readdir and calling this callback, leaving a window
2202                  * where this directory entry could have gone away.
2203                  */
2204                 dput(dentry);
2205                 return nfserr_noent;
2206         }
2207
2208         exp_get(exp);
2209         /*
2210          * In the case of a mountpoint, the client may be asking for
2211          * attributes that are only properties of the underlying filesystem
2212          * as opposed to the cross-mounted file system. In such a case,
2213          * we will not follow the cross mount and will fill the attribtutes
2214          * directly from the mountpoint dentry.
2215          */
2216         if (nfsd_mountpoint(dentry, exp)) {
2217                 int err;
2218
2219                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2220                                 && !attributes_need_mount(cd->rd_bmval)) {
2221                         ignore_crossmnt = 1;
2222                         goto out_encode;
2223                 }
2224                 /*
2225                  * Why the heck aren't we just using nfsd_lookup??
2226                  * Different "."/".." handling?  Something else?
2227                  * At least, add a comment here to explain....
2228                  */
2229                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2230                 if (err) {
2231                         nfserr = nfserrno(err);
2232                         goto out_put;
2233                 }
2234                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2235                 if (nfserr)
2236                         goto out_put;
2237
2238         }
2239 out_encode:
2240         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2241                                         cd->rd_rqstp, ignore_crossmnt);
2242 out_put:
2243         dput(dentry);
2244         exp_put(exp);
2245         return nfserr;
2246 }
2247
2248 static __be32 *
2249 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2250 {
2251         __be32 *attrlenp;
2252
2253         if (buflen < 6)
2254                 return NULL;
2255         *p++ = htonl(2);
2256         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2257         *p++ = htonl(0);                         /* bmval1 */
2258
2259         attrlenp = p++;
2260         *p++ = nfserr;       /* no htonl */
2261         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2262         return p;
2263 }
2264
2265 static int
2266 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2267                     loff_t offset, u64 ino, unsigned int d_type)
2268 {
2269         struct readdir_cd *ccd = ccdv;
2270         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2271         int buflen;
2272         __be32 *p = cd->buffer;
2273         __be32 *cookiep;
2274         __be32 nfserr = nfserr_toosmall;
2275
2276         /* In nfsv4, "." and ".." never make it onto the wire.. */
2277         if (name && isdotent(name, namlen)) {
2278                 cd->common.err = nfs_ok;
2279                 return 0;
2280         }
2281
2282         if (cd->offset)
2283                 xdr_encode_hyper(cd->offset, (u64) offset);
2284
2285         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2286         if (buflen < 0)
2287                 goto fail;
2288
2289         *p++ = xdr_one;                             /* mark entry present */
2290         cookiep = p;
2291         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2292         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2293
2294         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2295         switch (nfserr) {
2296         case nfs_ok:
2297                 p += buflen;
2298                 break;
2299         case nfserr_resource:
2300                 nfserr = nfserr_toosmall;
2301                 goto fail;
2302         case nfserr_dropit:
2303                 goto fail;
2304         case nfserr_noent:
2305                 goto skip_entry;
2306         default:
2307                 /*
2308                  * If the client requested the RDATTR_ERROR attribute,
2309                  * we stuff the error code into this attribute
2310                  * and continue.  If this attribute was not requested,
2311                  * then in accordance with the spec, we fail the
2312                  * entire READDIR operation(!)
2313                  */
2314                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2315                         goto fail;
2316                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2317                 if (p == NULL) {
2318                         nfserr = nfserr_toosmall;
2319                         goto fail;
2320                 }
2321         }
2322         cd->buflen -= (p - cd->buffer);
2323         cd->buffer = p;
2324         cd->offset = cookiep;
2325 skip_entry:
2326         cd->common.err = nfs_ok;
2327         return 0;
2328 fail:
2329         cd->common.err = nfserr;
2330         return -EINVAL;
2331 }
2332
2333 static void
2334 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2335 {
2336         __be32 *p;
2337
2338         RESERVE_SPACE(sizeof(stateid_t));
2339         WRITE32(sid->si_generation);
2340         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2341         ADJUST_ARGS();
2342 }
2343
2344 static __be32
2345 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2346 {
2347         __be32 *p;
2348
2349         if (!nfserr) {
2350                 RESERVE_SPACE(8);
2351                 WRITE32(access->ac_supported);
2352                 WRITE32(access->ac_resp_access);
2353                 ADJUST_ARGS();
2354         }
2355         return nfserr;
2356 }
2357
2358 static __be32
2359 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2360 {
2361         ENCODE_SEQID_OP_HEAD;
2362
2363         if (!nfserr)
2364                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2365
2366         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2367         return nfserr;
2368 }
2369
2370
2371 static __be32
2372 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2373 {
2374         __be32 *p;
2375
2376         if (!nfserr) {
2377                 RESERVE_SPACE(8);
2378                 WRITEMEM(commit->co_verf.data, 8);
2379                 ADJUST_ARGS();
2380         }
2381         return nfserr;
2382 }
2383
2384 static __be32
2385 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2386 {
2387         __be32 *p;
2388
2389         if (!nfserr) {
2390                 RESERVE_SPACE(32);
2391                 write_cinfo(&p, &create->cr_cinfo);
2392                 WRITE32(2);
2393                 WRITE32(create->cr_bmval[0]);
2394                 WRITE32(create->cr_bmval[1]);
2395                 ADJUST_ARGS();
2396         }
2397         return nfserr;
2398 }
2399
2400 static __be32
2401 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2402 {
2403         struct svc_fh *fhp = getattr->ga_fhp;
2404         int buflen;
2405
2406         if (nfserr)
2407                 return nfserr;
2408
2409         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2410         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2411                                     resp->p, &buflen, getattr->ga_bmval,
2412                                     resp->rqstp, 0);
2413         if (!nfserr)
2414                 resp->p += buflen;
2415         return nfserr;
2416 }
2417
2418 static __be32
2419 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2420 {
2421         struct svc_fh *fhp = *fhpp;
2422         unsigned int len;
2423         __be32 *p;
2424
2425         if (!nfserr) {
2426                 len = fhp->fh_handle.fh_size;
2427                 RESERVE_SPACE(len + 4);
2428                 WRITE32(len);
2429                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2430                 ADJUST_ARGS();
2431         }
2432         return nfserr;
2433 }
2434
2435 /*
2436 * Including all fields other than the name, a LOCK4denied structure requires
2437 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2438 */
2439 static void
2440 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2441 {
2442         __be32 *p;
2443
2444         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2445         WRITE64(ld->ld_start);
2446         WRITE64(ld->ld_length);
2447         WRITE32(ld->ld_type);
2448         if (ld->ld_sop) {
2449                 WRITEMEM(&ld->ld_clientid, 8);
2450                 WRITE32(ld->ld_sop->so_owner.len);
2451                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2452                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2453         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2454                 WRITE64((u64)0); /* clientid */
2455                 WRITE32(0); /* length of owner name */
2456         }
2457         ADJUST_ARGS();
2458 }
2459
2460 static __be32
2461 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2462 {
2463         ENCODE_SEQID_OP_HEAD;
2464
2465         if (!nfserr)
2466                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2467         else if (nfserr == nfserr_denied)
2468                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2469
2470         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2471         return nfserr;
2472 }
2473
2474 static __be32
2475 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2476 {
2477         if (nfserr == nfserr_denied)
2478                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2479         return nfserr;
2480 }
2481
2482 static __be32
2483 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2484 {
2485         ENCODE_SEQID_OP_HEAD;
2486
2487         if (!nfserr)
2488                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2489
2490         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2491         return nfserr;
2492 }
2493
2494
2495 static __be32
2496 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2497 {
2498         __be32 *p;
2499
2500         if (!nfserr) {
2501                 RESERVE_SPACE(20);
2502                 write_cinfo(&p, &link->li_cinfo);
2503                 ADJUST_ARGS();
2504         }
2505         return nfserr;
2506 }
2507
2508
2509 static __be32
2510 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2511 {
2512         __be32 *p;
2513         ENCODE_SEQID_OP_HEAD;
2514
2515         if (nfserr)
2516                 goto out;
2517
2518         nfsd4_encode_stateid(resp, &open->op_stateid);
2519         RESERVE_SPACE(40);
2520         write_cinfo(&p, &open->op_cinfo);
2521         WRITE32(open->op_rflags);
2522         WRITE32(2);
2523         WRITE32(open->op_bmval[0]);
2524         WRITE32(open->op_bmval[1]);
2525         WRITE32(open->op_delegate_type);
2526         ADJUST_ARGS();
2527
2528         switch (open->op_delegate_type) {
2529         case NFS4_OPEN_DELEGATE_NONE:
2530                 break;
2531         case NFS4_OPEN_DELEGATE_READ:
2532                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2533                 RESERVE_SPACE(20);
2534                 WRITE32(open->op_recall);
2535
2536                 /*
2537                  * TODO: ACE's in delegations
2538                  */
2539                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2540                 WRITE32(0);
2541                 WRITE32(0);
2542                 WRITE32(0);   /* XXX: is NULL principal ok? */
2543                 ADJUST_ARGS();
2544                 break;
2545         case NFS4_OPEN_DELEGATE_WRITE:
2546                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2547                 RESERVE_SPACE(32);
2548                 WRITE32(0);
2549
2550                 /*
2551                  * TODO: space_limit's in delegations
2552                  */
2553                 WRITE32(NFS4_LIMIT_SIZE);
2554                 WRITE32(~(u32)0);
2555                 WRITE32(~(u32)0);
2556
2557                 /*
2558                  * TODO: ACE's in delegations
2559                  */
2560                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2561                 WRITE32(0);
2562                 WRITE32(0);
2563                 WRITE32(0);   /* XXX: is NULL principal ok? */
2564                 ADJUST_ARGS();
2565                 break;
2566         default:
2567                 BUG();
2568         }
2569         /* XXX save filehandle here */
2570 out:
2571         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2572         return nfserr;
2573 }
2574
2575 static __be32
2576 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2577 {
2578         ENCODE_SEQID_OP_HEAD;
2579
2580         if (!nfserr)
2581                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2582
2583         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2584         return nfserr;
2585 }
2586
2587 static __be32
2588 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2589 {
2590         ENCODE_SEQID_OP_HEAD;
2591
2592         if (!nfserr)
2593                 nfsd4_encode_stateid(resp, &od->od_stateid);
2594
2595         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2596         return nfserr;
2597 }
2598
2599 static __be32
2600 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2601                   struct nfsd4_read *read)
2602 {
2603         u32 eof;
2604         int v, pn;
2605         unsigned long maxcount; 
2606         long len;
2607         __be32 *p;
2608
2609         if (nfserr)
2610                 return nfserr;
2611         if (resp->xbuf->page_len)
2612                 return nfserr_resource;
2613
2614         RESERVE_SPACE(8); /* eof flag and byte count */
2615
2616         maxcount = svc_max_payload(resp->rqstp);
2617         if (maxcount > read->rd_length)
2618                 maxcount = read->rd_length;
2619
2620         len = maxcount;
2621         v = 0;
2622         while (len > 0) {
2623                 pn = resp->rqstp->rq_resused++;
2624                 resp->rqstp->rq_vec[v].iov_base =
2625                         page_address(resp->rqstp->rq_respages[pn]);
2626                 resp->rqstp->rq_vec[v].iov_len =
2627                         len < PAGE_SIZE ? len : PAGE_SIZE;
2628                 v++;
2629                 len -= PAGE_SIZE;
2630         }
2631         read->rd_vlen = v;
2632
2633         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2634                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2635                         &maxcount);
2636
2637         if (nfserr == nfserr_symlink)
2638                 nfserr = nfserr_inval;
2639         if (nfserr)
2640                 return nfserr;
2641         eof = (read->rd_offset + maxcount >=
2642                read->rd_fhp->fh_dentry->d_inode->i_size);
2643
2644         WRITE32(eof);
2645         WRITE32(maxcount);
2646         ADJUST_ARGS();
2647         resp->xbuf->head[0].iov_len = (char*)p
2648                                         - (char*)resp->xbuf->head[0].iov_base;
2649         resp->xbuf->page_len = maxcount;
2650
2651         /* Use rest of head for padding and remaining ops: */
2652         resp->xbuf->tail[0].iov_base = p;
2653         resp->xbuf->tail[0].iov_len = 0;
2654         if (maxcount&3) {
2655                 RESERVE_SPACE(4);
2656                 WRITE32(0);
2657                 resp->xbuf->tail[0].iov_base += maxcount&3;
2658                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2659                 ADJUST_ARGS();
2660         }
2661         return 0;
2662 }
2663
2664 static __be32
2665 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2666 {
2667         int maxcount;
2668         char *page;
2669         __be32 *p;
2670
2671         if (nfserr)
2672                 return nfserr;
2673         if (resp->xbuf->page_len)
2674                 return nfserr_resource;
2675
2676         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2677
2678         maxcount = PAGE_SIZE;
2679         RESERVE_SPACE(4);
2680
2681         /*
2682          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2683          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2684          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2685          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2686          */
2687         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2688         if (nfserr == nfserr_isdir)
2689                 return nfserr_inval;
2690         if (nfserr)
2691                 return nfserr;
2692
2693         WRITE32(maxcount);
2694         ADJUST_ARGS();
2695         resp->xbuf->head[0].iov_len = (char*)p
2696                                 - (char*)resp->xbuf->head[0].iov_base;
2697         resp->xbuf->page_len = maxcount;
2698
2699         /* Use rest of head for padding and remaining ops: */
2700         resp->xbuf->tail[0].iov_base = p;
2701         resp->xbuf->tail[0].iov_len = 0;
2702         if (maxcount&3) {
2703                 RESERVE_SPACE(4);
2704                 WRITE32(0);
2705                 resp->xbuf->tail[0].iov_base += maxcount&3;
2706                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2707                 ADJUST_ARGS();
2708         }
2709         return 0;
2710 }
2711
2712 static __be32
2713 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2714 {
2715         int maxcount;
2716         loff_t offset;
2717         __be32 *page, *savep, *tailbase;
2718         __be32 *p;
2719
2720         if (nfserr)
2721                 return nfserr;
2722         if (resp->xbuf->page_len)
2723                 return nfserr_resource;
2724
2725         RESERVE_SPACE(8);  /* verifier */
2726         savep = p;
2727
2728         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2729         WRITE32(0);
2730         WRITE32(0);
2731         ADJUST_ARGS();
2732         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2733         tailbase = p;
2734
2735         maxcount = PAGE_SIZE;
2736         if (maxcount > readdir->rd_maxcount)
2737                 maxcount = readdir->rd_maxcount;
2738
2739         /*
2740          * Convert from bytes to words, account for the two words already
2741          * written, make sure to leave two words at the end for the next
2742          * pointer and eof field.
2743          */
2744         maxcount = (maxcount >> 2) - 4;
2745         if (maxcount < 0) {
2746                 nfserr =  nfserr_toosmall;
2747                 goto err_no_verf;
2748         }
2749
2750         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2751         readdir->common.err = 0;
2752         readdir->buflen = maxcount;
2753         readdir->buffer = page;
2754         readdir->offset = NULL;
2755
2756         offset = readdir->rd_cookie;
2757         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2758                               &offset,
2759                               &readdir->common, nfsd4_encode_dirent);
2760         if (nfserr == nfs_ok &&
2761             readdir->common.err == nfserr_toosmall &&
2762             readdir->buffer == page) 
2763                 nfserr = nfserr_toosmall;
2764         if (nfserr == nfserr_symlink)
2765                 nfserr = nfserr_notdir;
2766         if (nfserr)
2767                 goto err_no_verf;
2768
2769         if (readdir->offset)
2770                 xdr_encode_hyper(readdir->offset, offset);
2771
2772         p = readdir->buffer;
2773         *p++ = 0;       /* no more entries */
2774         *p++ = htonl(readdir->common.err == nfserr_eof);
2775         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2776                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2777
2778         /* Use rest of head for padding and remaining ops: */
2779         resp->xbuf->tail[0].iov_base = tailbase;
2780         resp->xbuf->tail[0].iov_len = 0;
2781         resp->p = resp->xbuf->tail[0].iov_base;
2782         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2783
2784         return 0;
2785 err_no_verf:
2786         p = savep;
2787         ADJUST_ARGS();
2788         return nfserr;
2789 }
2790
2791 static __be32
2792 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2793 {
2794         __be32 *p;
2795
2796         if (!nfserr) {
2797                 RESERVE_SPACE(20);
2798                 write_cinfo(&p, &remove->rm_cinfo);
2799                 ADJUST_ARGS();
2800         }
2801         return nfserr;
2802 }
2803
2804 static __be32
2805 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2806 {
2807         __be32 *p;
2808
2809         if (!nfserr) {
2810                 RESERVE_SPACE(40);
2811                 write_cinfo(&p, &rename->rn_sinfo);
2812                 write_cinfo(&p, &rename->rn_tinfo);
2813                 ADJUST_ARGS();
2814         }
2815         return nfserr;
2816 }
2817
2818 static __be32
2819 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2820                      struct nfsd4_secinfo *secinfo)
2821 {
2822         int i = 0;
2823         struct svc_export *exp = secinfo->si_exp;
2824         u32 nflavs;
2825         struct exp_flavor_info *flavs;
2826         struct exp_flavor_info def_flavs[2];
2827         __be32 *p;
2828
2829         if (nfserr)
2830                 goto out;
2831         if (exp->ex_nflavors) {
2832                 flavs = exp->ex_flavors;
2833                 nflavs = exp->ex_nflavors;
2834         } else { /* Handling of some defaults in absence of real secinfo: */
2835                 flavs = def_flavs;
2836                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2837                         nflavs = 2;
2838                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2839                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2840                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2841                         nflavs = 1;
2842                         flavs[0].pseudoflavor
2843                                         = svcauth_gss_flavor(exp->ex_client);
2844                 } else {
2845                         nflavs = 1;
2846                         flavs[0].pseudoflavor
2847                                         = exp->ex_client->flavour->flavour;
2848                 }
2849         }
2850
2851         RESERVE_SPACE(4);
2852         WRITE32(nflavs);
2853         ADJUST_ARGS();
2854         for (i = 0; i < nflavs; i++) {
2855                 u32 flav = flavs[i].pseudoflavor;
2856                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2857
2858                 if (gm) {
2859                         RESERVE_SPACE(4);
2860                         WRITE32(RPC_AUTH_GSS);
2861                         ADJUST_ARGS();
2862                         RESERVE_SPACE(4 + gm->gm_oid.len);
2863                         WRITE32(gm->gm_oid.len);
2864                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2865                         ADJUST_ARGS();
2866                         RESERVE_SPACE(4);
2867                         WRITE32(0); /* qop */
2868                         ADJUST_ARGS();
2869                         RESERVE_SPACE(4);
2870                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2871                         ADJUST_ARGS();
2872                         gss_mech_put(gm);
2873                 } else {
2874                         RESERVE_SPACE(4);
2875                         WRITE32(flav);
2876                         ADJUST_ARGS();
2877                 }
2878         }
2879 out:
2880         if (exp)
2881                 exp_put(exp);
2882         return nfserr;
2883 }
2884
2885 /*
2886  * The SETATTR encode routine is special -- it always encodes a bitmap,
2887  * regardless of the error status.
2888  */
2889 static __be32
2890 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2891 {
2892         __be32 *p;
2893
2894         RESERVE_SPACE(12);
2895         if (nfserr) {
2896                 WRITE32(2);
2897                 WRITE32(0);
2898                 WRITE32(0);
2899         }
2900         else {
2901                 WRITE32(2);
2902                 WRITE32(setattr->sa_bmval[0]);
2903                 WRITE32(setattr->sa_bmval[1]);
2904         }
2905         ADJUST_ARGS();
2906         return nfserr;
2907 }
2908
2909 static __be32
2910 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2911 {
2912         __be32 *p;
2913
2914         if (!nfserr) {
2915                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2916                 WRITEMEM(&scd->se_clientid, 8);
2917                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2918                 ADJUST_ARGS();
2919         }
2920         else if (nfserr == nfserr_clid_inuse) {
2921                 RESERVE_SPACE(8);
2922                 WRITE32(0);
2923                 WRITE32(0);
2924                 ADJUST_ARGS();
2925         }
2926         return nfserr;
2927 }
2928
2929 static __be32
2930 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2931 {
2932         __be32 *p;
2933
2934         if (!nfserr) {
2935                 RESERVE_SPACE(16);
2936                 WRITE32(write->wr_bytes_written);
2937                 WRITE32(write->wr_how_written);
2938                 WRITEMEM(write->wr_verifier.data, 8);
2939                 ADJUST_ARGS();
2940         }
2941         return nfserr;
2942 }
2943
2944 static __be32
2945 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2946                          struct nfsd4_exchange_id *exid)
2947 {
2948         __be32 *p;
2949         char *major_id;
2950         char *server_scope;
2951         int major_id_sz;
2952         int server_scope_sz;
2953         uint64_t minor_id = 0;
2954
2955         if (nfserr)
2956                 return nfserr;
2957
2958         major_id = utsname()->nodename;
2959         major_id_sz = strlen(major_id);
2960         server_scope = utsname()->nodename;
2961         server_scope_sz = strlen(server_scope);
2962
2963         RESERVE_SPACE(
2964                 8 /* eir_clientid */ +
2965                 4 /* eir_sequenceid */ +
2966                 4 /* eir_flags */ +
2967                 4 /* spr_how (SP4_NONE) */ +
2968                 8 /* so_minor_id */ +
2969                 4 /* so_major_id.len */ +
2970                 (XDR_QUADLEN(major_id_sz) * 4) +
2971                 4 /* eir_server_scope.len */ +
2972                 (XDR_QUADLEN(server_scope_sz) * 4) +
2973                 4 /* eir_server_impl_id.count (0) */);
2974
2975         WRITEMEM(&exid->clientid, 8);
2976         WRITE32(exid->seqid);
2977         WRITE32(exid->flags);
2978
2979         /* state_protect4_r. Currently only support SP4_NONE */
2980         BUG_ON(exid->spa_how != SP4_NONE);
2981         WRITE32(exid->spa_how);
2982
2983         /* The server_owner struct */
2984         WRITE64(minor_id);      /* Minor id */
2985         /* major id */
2986         WRITE32(major_id_sz);
2987         WRITEMEM(major_id, major_id_sz);
2988
2989         /* Server scope */
2990         WRITE32(server_scope_sz);
2991         WRITEMEM(server_scope, server_scope_sz);
2992
2993         /* Implementation id */
2994         WRITE32(0);     /* zero length nfs_impl_id4 array */
2995         ADJUST_ARGS();
2996         return 0;
2997 }
2998
2999 static __be32
3000 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3001                             struct nfsd4_create_session *sess)
3002 {
3003         __be32 *p;
3004
3005         if (nfserr)
3006                 return nfserr;
3007
3008         RESERVE_SPACE(24);
3009         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3010         WRITE32(sess->seqid);
3011         WRITE32(sess->flags);
3012         ADJUST_ARGS();
3013
3014         RESERVE_SPACE(28);
3015         WRITE32(0); /* headerpadsz */
3016         WRITE32(sess->fore_channel.maxreq_sz);
3017         WRITE32(sess->fore_channel.maxresp_sz);
3018         WRITE32(sess->fore_channel.maxresp_cached);
3019         WRITE32(sess->fore_channel.maxops);
3020         WRITE32(sess->fore_channel.maxreqs);
3021         WRITE32(sess->fore_channel.nr_rdma_attrs);
3022         ADJUST_ARGS();
3023
3024         if (sess->fore_channel.nr_rdma_attrs) {
3025                 RESERVE_SPACE(4);
3026                 WRITE32(sess->fore_channel.rdma_attrs);
3027                 ADJUST_ARGS();
3028         }
3029
3030         RESERVE_SPACE(28);
3031         WRITE32(0); /* headerpadsz */
3032         WRITE32(sess->back_channel.maxreq_sz);
3033         WRITE32(sess->back_channel.maxresp_sz);
3034         WRITE32(sess->back_channel.maxresp_cached);
3035         WRITE32(sess->back_channel.maxops);
3036         WRITE32(sess->back_channel.maxreqs);
3037         WRITE32(sess->back_channel.nr_rdma_attrs);
3038         ADJUST_ARGS();
3039
3040         if (sess->back_channel.nr_rdma_attrs) {
3041                 RESERVE_SPACE(4);
3042                 WRITE32(sess->back_channel.rdma_attrs);
3043                 ADJUST_ARGS();
3044         }
3045         return 0;
3046 }
3047
3048 static __be32
3049 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3050                              struct nfsd4_destroy_session *destroy_session)
3051 {
3052         return nfserr;
3053 }
3054
3055 __be32
3056 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3057                       struct nfsd4_sequence *seq)
3058 {
3059         __be32 *p;
3060
3061         if (nfserr)
3062                 return nfserr;
3063
3064         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3065         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3066         WRITE32(seq->seqid);
3067         WRITE32(seq->slotid);
3068         WRITE32(seq->maxslots);
3069         /*
3070          * FIXME: for now:
3071          *   target_maxslots = maxslots
3072          *   status_flags = 0
3073          */
3074         WRITE32(seq->maxslots);
3075         WRITE32(0);
3076
3077         ADJUST_ARGS();
3078         resp->cstate.datap = p; /* DRC cache data pointer */
3079         return 0;
3080 }
3081
3082 static __be32
3083 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3084 {
3085         return nfserr;
3086 }
3087
3088 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3089
3090 /*
3091  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3092  * since we don't need to filter out obsolete ops as this is
3093  * done in the decoding phase.
3094  */
3095 static nfsd4_enc nfsd4_enc_ops[] = {
3096         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3097         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3098         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3099         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3100         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3101         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3102         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3103         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3104         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3105         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3106         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3107         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3108         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3109         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3110         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3111         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3112         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3113         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3114         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3115         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3116         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3117         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3118         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3119         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3120         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3121         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3122         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3123         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3124         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3125         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3126         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3127         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3128         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3129         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3130         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3131         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3132         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3133
3134         /* NFSv4.1 operations */
3135         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3136         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3137         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3138         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3139         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3140         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3141         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3142         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3143         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3144         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3145         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3146         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3147         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3148         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3149         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3150         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3151         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3152         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3153         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3154 };
3155
3156 /*
3157  * Calculate the total amount of memory that the compound response has taken
3158  * after encoding the current operation.
3159  *
3160  * pad: add on 8 bytes for the next operation's op_code and status so that
3161  * there is room to cache a failure on the next operation.
3162  *
3163  * Compare this length to the session se_fmaxresp_cached.
3164  *
3165  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3166  * will be at least a page and will therefore hold the xdr_buf head.
3167  */
3168 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3169 {
3170         int status = 0;
3171         struct xdr_buf *xb = &resp->rqstp->rq_res;
3172         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3173         struct nfsd4_session *session = NULL;
3174         struct nfsd4_slot *slot = resp->cstate.slot;
3175         u32 length, tlen = 0, pad = 8;
3176
3177         if (!nfsd4_has_session(&resp->cstate))
3178                 return status;
3179
3180         session = resp->cstate.session;
3181         if (session == NULL || slot->sl_cachethis == 0)
3182                 return status;
3183
3184         if (resp->opcnt >= args->opcnt)
3185                 pad = 0; /* this is the last operation */
3186
3187         if (xb->page_len == 0) {
3188                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3189         } else {
3190                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3191                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3192
3193                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3194         }
3195         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3196                 length, xb->page_len, tlen, pad);
3197
3198         if (length <= session->se_fchannel.maxresp_cached)
3199                 return status;
3200         else
3201                 return nfserr_rep_too_big_to_cache;
3202 }
3203
3204 void
3205 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3206 {
3207         __be32 *statp;
3208         __be32 *p;
3209
3210         RESERVE_SPACE(8);
3211         WRITE32(op->opnum);
3212         statp = p++;    /* to be backfilled at the end */
3213         ADJUST_ARGS();
3214
3215         if (op->opnum == OP_ILLEGAL)
3216                 goto status;
3217         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3218                !nfsd4_enc_ops[op->opnum]);
3219         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3220         /* nfsd4_check_drc_limit guarantees enough room for error status */
3221         if (!op->status && nfsd4_check_drc_limit(resp))
3222                 op->status = nfserr_rep_too_big_to_cache;
3223 status:
3224         /*
3225          * Note: We write the status directly, instead of using WRITE32(),
3226          * since it is already in network byte order.
3227          */
3228         *statp = op->status;
3229 }
3230
3231 /* 
3232  * Encode the reply stored in the stateowner reply cache 
3233  * 
3234  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3235  * previously sent already encoded operation.
3236  *
3237  * called with nfs4_lock_state() held
3238  */
3239 void
3240 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3241 {
3242         __be32 *p;
3243         struct nfs4_replay *rp = op->replay;
3244
3245         BUG_ON(!rp);
3246
3247         RESERVE_SPACE(8);
3248         WRITE32(op->opnum);
3249         *p++ = rp->rp_status;  /* already xdr'ed */
3250         ADJUST_ARGS();
3251
3252         RESERVE_SPACE(rp->rp_buflen);
3253         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3254         ADJUST_ARGS();
3255 }
3256
3257 int
3258 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3259 {
3260         return xdr_ressize_check(rqstp, p);
3261 }
3262
3263 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3264 {
3265         if (args->ops != args->iops) {
3266                 kfree(args->ops);
3267                 args->ops = args->iops;
3268         }
3269         kfree(args->tmpp);
3270         args->tmpp = NULL;
3271         while (args->to_free) {
3272                 struct tmpbuf *tb = args->to_free;
3273                 args->to_free = tb->next;
3274                 tb->release(tb->buf);
3275                 kfree(tb);
3276         }
3277 }
3278
3279 int
3280 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3281 {
3282         __be32 status;
3283
3284         args->p = p;
3285         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3286         args->pagelist = rqstp->rq_arg.pages;
3287         args->pagelen = rqstp->rq_arg.page_len;
3288         args->tmpp = NULL;
3289         args->to_free = NULL;
3290         args->ops = args->iops;
3291         args->rqstp = rqstp;
3292
3293         status = nfsd4_decode_compound(args);
3294         if (status) {
3295                 nfsd4_release_compoundargs(args);
3296         }
3297         return !status;
3298 }
3299
3300 int
3301 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3302 {
3303         /*
3304          * All that remains is to write the tag and operation count...
3305          */
3306         struct nfsd4_compound_state *cs = &resp->cstate;
3307         struct kvec *iov;
3308         p = resp->tagp;
3309         *p++ = htonl(resp->taglen);
3310         memcpy(p, resp->tag, resp->taglen);
3311         p += XDR_QUADLEN(resp->taglen);
3312         *p++ = htonl(resp->opcnt);
3313
3314         if (rqstp->rq_res.page_len) 
3315                 iov = &rqstp->rq_res.tail[0];
3316         else
3317                 iov = &rqstp->rq_res.head[0];
3318         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3319         BUG_ON(iov->iov_len > PAGE_SIZE);
3320         if (nfsd4_has_session(cs)) {
3321                 if (cs->status != nfserr_replay_cache) {
3322                         nfsd4_store_cache_entry(resp);
3323                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3324                         cs->slot->sl_inuse = false;
3325                 }
3326                 /* Renew the clientid on success and on replay */
3327                 release_session_client(cs->session);
3328         }
3329         return 1;
3330 }
3331
3332 /*
3333  * Local variables:
3334  *  c-basic-offset: 8
3335  * End:
3336  */