nfsd41: pass writable attrs mask to nfsd4_decode_fattr
[linux-2.6.git] / fs / nfsd / nfs4xdr.c
1 /*
2  *  Server-side XDR for NFSv4
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  *
35  * TODO: Neil Brown made the following observation:  We currently
36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
37  * never release any of that until the request is complete.
38  * It would be good to calculate a new maximum response size while
39  * decoding the COMPOUND, and call svc_reserve with this number
40  * at the end of nfs4svc_decode_compoundargs.
41  */
42
43 #include <linux/param.h>
44 #include <linux/smp.h>
45 #include <linux/fs.h>
46 #include <linux/namei.h>
47 #include <linux/vfs.h>
48 #include <linux/utsname.h>
49 #include <linux/sunrpc/xdr.h>
50 #include <linux/sunrpc/svc.h>
51 #include <linux/sunrpc/clnt.h>
52 #include <linux/nfsd/nfsd.h>
53 #include <linux/nfsd/state.h>
54 #include <linux/nfsd/xdr4.h>
55 #include <linux/nfsd_idmap.h>
56 #include <linux/nfs4.h>
57 #include <linux/nfs4_acl.h>
58 #include <linux/sunrpc/gss_api.h>
59 #include <linux/sunrpc/svcauth_gss.h>
60
61 #define NFSDDBG_FACILITY                NFSDDBG_XDR
62
63 /*
64  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
65  * directory in order to indicate to the client that a filesystem boundary is present
66  * We use a fixed fsid for a referral
67  */
68 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
69 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
70
71 static __be32
72 check_filename(char *str, int len, __be32 err)
73 {
74         int i;
75
76         if (len == 0)
77                 return nfserr_inval;
78         if (isdotent(str, len))
79                 return err;
80         for (i = 0; i < len; i++)
81                 if (str[i] == '/')
82                         return err;
83         return 0;
84 }
85
86 /*
87  * START OF "GENERIC" DECODE ROUTINES.
88  *   These may look a little ugly since they are imported from a "generic"
89  * set of XDR encode/decode routines which are intended to be shared by
90  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
91  *
92  * If the pain of reading these is too great, it should be a straightforward
93  * task to translate them into Linux-specific versions which are more
94  * consistent with the style used in NFSv2/v3...
95  */
96 #define DECODE_HEAD                             \
97         __be32 *p;                              \
98         __be32 status
99 #define DECODE_TAIL                             \
100         status = 0;                             \
101 out:                                            \
102         return status;                          \
103 xdr_error:                                      \
104         dprintk("NFSD: xdr error (%s:%d)\n",    \
105                         __FILE__, __LINE__);    \
106         status = nfserr_bad_xdr;                \
107         goto out
108
109 #define READ32(x)         (x) = ntohl(*p++)
110 #define READ64(x)         do {                  \
111         (x) = (u64)ntohl(*p++) << 32;           \
112         (x) |= ntohl(*p++);                     \
113 } while (0)
114 #define READTIME(x)       do {                  \
115         p++;                                    \
116         (x) = ntohl(*p++);                      \
117         p++;                                    \
118 } while (0)
119 #define READMEM(x,nbytes) do {                  \
120         x = (char *)p;                          \
121         p += XDR_QUADLEN(nbytes);               \
122 } while (0)
123 #define SAVEMEM(x,nbytes) do {                  \
124         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
125                 savemem(argp, p, nbytes) :      \
126                 (char *)p)) {                   \
127                 dprintk("NFSD: xdr error (%s:%d)\n", \
128                                 __FILE__, __LINE__); \
129                 goto xdr_error;                 \
130                 }                               \
131         p += XDR_QUADLEN(nbytes);               \
132 } while (0)
133 #define COPYMEM(x,nbytes) do {                  \
134         memcpy((x), p, nbytes);                 \
135         p += XDR_QUADLEN(nbytes);               \
136 } while (0)
137
138 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
139 #define READ_BUF(nbytes)  do {                  \
140         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
141                 p = argp->p;                    \
142                 argp->p += XDR_QUADLEN(nbytes); \
143         } else if (!(p = read_buf(argp, nbytes))) { \
144                 dprintk("NFSD: xdr error (%s:%d)\n", \
145                                 __FILE__, __LINE__); \
146                 goto xdr_error;                 \
147         }                                       \
148 } while (0)
149
150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
151 {
152         /* We want more bytes than seem to be available.
153          * Maybe we need a new page, maybe we have just run out
154          */
155         unsigned int avail = (char *)argp->end - (char *)argp->p;
156         __be32 *p;
157         if (avail + argp->pagelen < nbytes)
158                 return NULL;
159         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
160                 return NULL;
161         /* ok, we can do it with the current plus the next page */
162         if (nbytes <= sizeof(argp->tmp))
163                 p = argp->tmp;
164         else {
165                 kfree(argp->tmpp);
166                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
167                 if (!p)
168                         return NULL;
169                 
170         }
171         /*
172          * The following memcpy is safe because read_buf is always
173          * called with nbytes > avail, and the two cases above both
174          * guarantee p points to at least nbytes bytes.
175          */
176         memcpy(p, argp->p, avail);
177         /* step to next page */
178         argp->p = page_address(argp->pagelist[0]);
179         argp->pagelist++;
180         if (argp->pagelen < PAGE_SIZE) {
181                 argp->end = p + (argp->pagelen>>2);
182                 argp->pagelen = 0;
183         } else {
184                 argp->end = p + (PAGE_SIZE>>2);
185                 argp->pagelen -= PAGE_SIZE;
186         }
187         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
188         argp->p += XDR_QUADLEN(nbytes - avail);
189         return p;
190 }
191
192 static int zero_clientid(clientid_t *clid)
193 {
194         return (clid->cl_boot == 0) && (clid->cl_id == 0);
195 }
196
197 static int
198 defer_free(struct nfsd4_compoundargs *argp,
199                 void (*release)(const void *), void *p)
200 {
201         struct tmpbuf *tb;
202
203         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
204         if (!tb)
205                 return -ENOMEM;
206         tb->buf = p;
207         tb->release = release;
208         tb->next = argp->to_free;
209         argp->to_free = tb;
210         return 0;
211 }
212
213 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
214 {
215         if (p == argp->tmp) {
216                 p = kmalloc(nbytes, GFP_KERNEL);
217                 if (!p)
218                         return NULL;
219                 memcpy(p, argp->tmp, nbytes);
220         } else {
221                 BUG_ON(p != argp->tmpp);
222                 argp->tmpp = NULL;
223         }
224         if (defer_free(argp, kfree, p)) {
225                 kfree(p);
226                 return NULL;
227         } else
228                 return (char *)p;
229 }
230
231 static __be32
232 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
233 {
234         u32 bmlen;
235         DECODE_HEAD;
236
237         bmval[0] = 0;
238         bmval[1] = 0;
239
240         READ_BUF(4);
241         READ32(bmlen);
242         if (bmlen > 1000)
243                 goto xdr_error;
244
245         READ_BUF(bmlen << 2);
246         if (bmlen > 0)
247                 READ32(bmval[0]);
248         if (bmlen > 1)
249                 READ32(bmval[1]);
250
251         DECODE_TAIL;
252 }
253
254 static u32 nfsd_attrmask[] = {
255         NFSD_WRITEABLE_ATTRS_WORD0,
256         NFSD_WRITEABLE_ATTRS_WORD1
257 };
258
259 static __be32
260 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, u32 *writable,
261                    struct iattr *iattr, struct nfs4_acl **acl)
262 {
263         int expected_len, len = 0;
264         u32 dummy32;
265         char *buf;
266         int host_err;
267
268         DECODE_HEAD;
269         iattr->ia_valid = 0;
270         if ((status = nfsd4_decode_bitmap(argp, bmval)))
271                 return status;
272
273         /*
274          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
275          * read-only attributes return ERR_INVAL.
276          */
277         if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
278                 return nfserr_attrnotsupp;
279         if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]))
280                 return nfserr_inval;
281
282         READ_BUF(4);
283         READ32(expected_len);
284
285         if (bmval[0] & FATTR4_WORD0_SIZE) {
286                 READ_BUF(8);
287                 len += 8;
288                 READ64(iattr->ia_size);
289                 iattr->ia_valid |= ATTR_SIZE;
290         }
291         if (bmval[0] & FATTR4_WORD0_ACL) {
292                 int nace;
293                 struct nfs4_ace *ace;
294
295                 READ_BUF(4); len += 4;
296                 READ32(nace);
297
298                 if (nace > NFS4_ACL_MAX)
299                         return nfserr_resource;
300
301                 *acl = nfs4_acl_new(nace);
302                 if (*acl == NULL) {
303                         host_err = -ENOMEM;
304                         goto out_nfserr;
305                 }
306                 defer_free(argp, kfree, *acl);
307
308                 (*acl)->naces = nace;
309                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
310                         READ_BUF(16); len += 16;
311                         READ32(ace->type);
312                         READ32(ace->flag);
313                         READ32(ace->access_mask);
314                         READ32(dummy32);
315                         READ_BUF(dummy32);
316                         len += XDR_QUADLEN(dummy32) << 2;
317                         READMEM(buf, dummy32);
318                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
319                         host_err = 0;
320                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
321                                 ace->who = 0;
322                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
323                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
324                                                 buf, dummy32, &ace->who);
325                         else
326                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
327                                                 buf, dummy32, &ace->who);
328                         if (host_err)
329                                 goto out_nfserr;
330                 }
331         } else
332                 *acl = NULL;
333         if (bmval[1] & FATTR4_WORD1_MODE) {
334                 READ_BUF(4);
335                 len += 4;
336                 READ32(iattr->ia_mode);
337                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
338                 iattr->ia_valid |= ATTR_MODE;
339         }
340         if (bmval[1] & FATTR4_WORD1_OWNER) {
341                 READ_BUF(4);
342                 len += 4;
343                 READ32(dummy32);
344                 READ_BUF(dummy32);
345                 len += (XDR_QUADLEN(dummy32) << 2);
346                 READMEM(buf, dummy32);
347                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
348                         goto out_nfserr;
349                 iattr->ia_valid |= ATTR_UID;
350         }
351         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
352                 READ_BUF(4);
353                 len += 4;
354                 READ32(dummy32);
355                 READ_BUF(dummy32);
356                 len += (XDR_QUADLEN(dummy32) << 2);
357                 READMEM(buf, dummy32);
358                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
359                         goto out_nfserr;
360                 iattr->ia_valid |= ATTR_GID;
361         }
362         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
363                 READ_BUF(4);
364                 len += 4;
365                 READ32(dummy32);
366                 switch (dummy32) {
367                 case NFS4_SET_TO_CLIENT_TIME:
368                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
369                            all 32 bits of 'nseconds'. */
370                         READ_BUF(12);
371                         len += 12;
372                         READ32(dummy32);
373                         if (dummy32)
374                                 return nfserr_inval;
375                         READ32(iattr->ia_atime.tv_sec);
376                         READ32(iattr->ia_atime.tv_nsec);
377                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
378                                 return nfserr_inval;
379                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
380                         break;
381                 case NFS4_SET_TO_SERVER_TIME:
382                         iattr->ia_valid |= ATTR_ATIME;
383                         break;
384                 default:
385                         goto xdr_error;
386                 }
387         }
388         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
389                 READ_BUF(4);
390                 len += 4;
391                 READ32(dummy32);
392                 switch (dummy32) {
393                 case NFS4_SET_TO_CLIENT_TIME:
394                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
395                            all 32 bits of 'nseconds'. */
396                         READ_BUF(12);
397                         len += 12;
398                         READ32(dummy32);
399                         if (dummy32)
400                                 return nfserr_inval;
401                         READ32(iattr->ia_mtime.tv_sec);
402                         READ32(iattr->ia_mtime.tv_nsec);
403                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
404                                 return nfserr_inval;
405                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
406                         break;
407                 case NFS4_SET_TO_SERVER_TIME:
408                         iattr->ia_valid |= ATTR_MTIME;
409                         break;
410                 default:
411                         goto xdr_error;
412                 }
413         }
414         if (len != expected_len)
415                 goto xdr_error;
416
417         DECODE_TAIL;
418
419 out_nfserr:
420         status = nfserrno(host_err);
421         goto out;
422 }
423
424 static __be32
425 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
426 {
427         DECODE_HEAD;
428
429         READ_BUF(sizeof(stateid_t));
430         READ32(sid->si_generation);
431         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
432
433         DECODE_TAIL;
434 }
435
436 static __be32
437 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
438 {
439         DECODE_HEAD;
440
441         READ_BUF(4);
442         READ32(access->ac_req_access);
443
444         DECODE_TAIL;
445 }
446
447 static __be32
448 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
449 {
450         DECODE_HEAD;
451
452         close->cl_stateowner = NULL;
453         READ_BUF(4);
454         READ32(close->cl_seqid);
455         return nfsd4_decode_stateid(argp, &close->cl_stateid);
456
457         DECODE_TAIL;
458 }
459
460
461 static __be32
462 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
463 {
464         DECODE_HEAD;
465
466         READ_BUF(12);
467         READ64(commit->co_offset);
468         READ32(commit->co_count);
469
470         DECODE_TAIL;
471 }
472
473 static __be32
474 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
475 {
476         DECODE_HEAD;
477
478         READ_BUF(4);
479         READ32(create->cr_type);
480         switch (create->cr_type) {
481         case NF4LNK:
482                 READ_BUF(4);
483                 READ32(create->cr_linklen);
484                 READ_BUF(create->cr_linklen);
485                 SAVEMEM(create->cr_linkname, create->cr_linklen);
486                 break;
487         case NF4BLK:
488         case NF4CHR:
489                 READ_BUF(8);
490                 READ32(create->cr_specdata1);
491                 READ32(create->cr_specdata2);
492                 break;
493         case NF4SOCK:
494         case NF4FIFO:
495         case NF4DIR:
496         default:
497                 break;
498         }
499
500         READ_BUF(4);
501         READ32(create->cr_namelen);
502         READ_BUF(create->cr_namelen);
503         SAVEMEM(create->cr_name, create->cr_namelen);
504         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
505                 return status;
506
507         status = nfsd4_decode_fattr(argp, create->cr_bmval, nfsd_attrmask,
508                                     &create->cr_iattr, &create->cr_acl);
509         if (status)
510                 goto out;
511
512         DECODE_TAIL;
513 }
514
515 static inline __be32
516 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
517 {
518         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
519 }
520
521 static inline __be32
522 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
523 {
524         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
525 }
526
527 static __be32
528 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
529 {
530         DECODE_HEAD;
531
532         READ_BUF(4);
533         READ32(link->li_namelen);
534         READ_BUF(link->li_namelen);
535         SAVEMEM(link->li_name, link->li_namelen);
536         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
537                 return status;
538
539         DECODE_TAIL;
540 }
541
542 static __be32
543 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
544 {
545         DECODE_HEAD;
546
547         lock->lk_replay_owner = NULL;
548         /*
549         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
550         */
551         READ_BUF(28);
552         READ32(lock->lk_type);
553         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
554                 goto xdr_error;
555         READ32(lock->lk_reclaim);
556         READ64(lock->lk_offset);
557         READ64(lock->lk_length);
558         READ32(lock->lk_is_new);
559
560         if (lock->lk_is_new) {
561                 READ_BUF(4);
562                 READ32(lock->lk_new_open_seqid);
563                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
564                 if (status)
565                         return status;
566                 READ_BUF(8 + sizeof(clientid_t));
567                 READ32(lock->lk_new_lock_seqid);
568                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
569                 READ32(lock->lk_new_owner.len);
570                 READ_BUF(lock->lk_new_owner.len);
571                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
572         } else {
573                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
574                 if (status)
575                         return status;
576                 READ_BUF(4);
577                 READ32(lock->lk_old_lock_seqid);
578         }
579
580         DECODE_TAIL;
581 }
582
583 static __be32
584 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
585 {
586         DECODE_HEAD;
587                         
588         READ_BUF(32);
589         READ32(lockt->lt_type);
590         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
591                 goto xdr_error;
592         READ64(lockt->lt_offset);
593         READ64(lockt->lt_length);
594         COPYMEM(&lockt->lt_clientid, 8);
595         READ32(lockt->lt_owner.len);
596         READ_BUF(lockt->lt_owner.len);
597         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
598
599         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
600                 return nfserr_inval;
601         DECODE_TAIL;
602 }
603
604 static __be32
605 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
606 {
607         DECODE_HEAD;
608
609         locku->lu_stateowner = NULL;
610         READ_BUF(8);
611         READ32(locku->lu_type);
612         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
613                 goto xdr_error;
614         READ32(locku->lu_seqid);
615         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
616         if (status)
617                 return status;
618         READ_BUF(16);
619         READ64(locku->lu_offset);
620         READ64(locku->lu_length);
621
622         DECODE_TAIL;
623 }
624
625 static __be32
626 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
627 {
628         DECODE_HEAD;
629
630         READ_BUF(4);
631         READ32(lookup->lo_len);
632         READ_BUF(lookup->lo_len);
633         SAVEMEM(lookup->lo_name, lookup->lo_len);
634         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
635                 return status;
636
637         DECODE_TAIL;
638 }
639
640 static __be32
641 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
642 {
643         DECODE_HEAD;
644
645         memset(open->op_bmval, 0, sizeof(open->op_bmval));
646         open->op_iattr.ia_valid = 0;
647         open->op_stateowner = NULL;
648
649         /* seqid, share_access, share_deny, clientid, ownerlen */
650         READ_BUF(16 + sizeof(clientid_t));
651         READ32(open->op_seqid);
652         READ32(open->op_share_access);
653         READ32(open->op_share_deny);
654         COPYMEM(&open->op_clientid, sizeof(clientid_t));
655         READ32(open->op_owner.len);
656
657         /* owner, open_flag */
658         READ_BUF(open->op_owner.len + 4);
659         SAVEMEM(open->op_owner.data, open->op_owner.len);
660         READ32(open->op_create);
661         switch (open->op_create) {
662         case NFS4_OPEN_NOCREATE:
663                 break;
664         case NFS4_OPEN_CREATE:
665                 READ_BUF(4);
666                 READ32(open->op_createmode);
667                 switch (open->op_createmode) {
668                 case NFS4_CREATE_UNCHECKED:
669                 case NFS4_CREATE_GUARDED:
670                         status = nfsd4_decode_fattr(argp, open->op_bmval,
671                                 nfsd_attrmask, &open->op_iattr, &open->op_acl);
672                         if (status)
673                                 goto out;
674                         break;
675                 case NFS4_CREATE_EXCLUSIVE:
676                         READ_BUF(8);
677                         COPYMEM(open->op_verf.data, 8);
678                         break;
679                 default:
680                         goto xdr_error;
681                 }
682                 break;
683         default:
684                 goto xdr_error;
685         }
686
687         /* open_claim */
688         READ_BUF(4);
689         READ32(open->op_claim_type);
690         switch (open->op_claim_type) {
691         case NFS4_OPEN_CLAIM_NULL:
692         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
693                 READ_BUF(4);
694                 READ32(open->op_fname.len);
695                 READ_BUF(open->op_fname.len);
696                 SAVEMEM(open->op_fname.data, open->op_fname.len);
697                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
698                         return status;
699                 break;
700         case NFS4_OPEN_CLAIM_PREVIOUS:
701                 READ_BUF(4);
702                 READ32(open->op_delegate_type);
703                 break;
704         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
705                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
706                 if (status)
707                         return status;
708                 READ_BUF(4);
709                 READ32(open->op_fname.len);
710                 READ_BUF(open->op_fname.len);
711                 SAVEMEM(open->op_fname.data, open->op_fname.len);
712                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
713                         return status;
714                 break;
715         default:
716                 goto xdr_error;
717         }
718
719         DECODE_TAIL;
720 }
721
722 static __be32
723 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
724 {
725         DECODE_HEAD;
726                     
727         open_conf->oc_stateowner = NULL;
728         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
729         if (status)
730                 return status;
731         READ_BUF(4);
732         READ32(open_conf->oc_seqid);
733                                                         
734         DECODE_TAIL;
735 }
736
737 static __be32
738 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
739 {
740         DECODE_HEAD;
741                     
742         open_down->od_stateowner = NULL;
743         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
744         if (status)
745                 return status;
746         READ_BUF(12);
747         READ32(open_down->od_seqid);
748         READ32(open_down->od_share_access);
749         READ32(open_down->od_share_deny);
750                                                         
751         DECODE_TAIL;
752 }
753
754 static __be32
755 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
756 {
757         DECODE_HEAD;
758
759         READ_BUF(4);
760         READ32(putfh->pf_fhlen);
761         if (putfh->pf_fhlen > NFS4_FHSIZE)
762                 goto xdr_error;
763         READ_BUF(putfh->pf_fhlen);
764         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
765
766         DECODE_TAIL;
767 }
768
769 static __be32
770 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
771 {
772         DECODE_HEAD;
773
774         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
775         if (status)
776                 return status;
777         READ_BUF(12);
778         READ64(read->rd_offset);
779         READ32(read->rd_length);
780
781         DECODE_TAIL;
782 }
783
784 static __be32
785 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
786 {
787         DECODE_HEAD;
788
789         READ_BUF(24);
790         READ64(readdir->rd_cookie);
791         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
792         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
793         READ32(readdir->rd_maxcount);
794         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
795                 goto out;
796
797         DECODE_TAIL;
798 }
799
800 static __be32
801 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
802 {
803         DECODE_HEAD;
804
805         READ_BUF(4);
806         READ32(remove->rm_namelen);
807         READ_BUF(remove->rm_namelen);
808         SAVEMEM(remove->rm_name, remove->rm_namelen);
809         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
810                 return status;
811
812         DECODE_TAIL;
813 }
814
815 static __be32
816 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
817 {
818         DECODE_HEAD;
819
820         READ_BUF(4);
821         READ32(rename->rn_snamelen);
822         READ_BUF(rename->rn_snamelen + 4);
823         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
824         READ32(rename->rn_tnamelen);
825         READ_BUF(rename->rn_tnamelen);
826         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
827         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
828                 return status;
829         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
830                 return status;
831
832         DECODE_TAIL;
833 }
834
835 static __be32
836 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
837 {
838         DECODE_HEAD;
839
840         READ_BUF(sizeof(clientid_t));
841         COPYMEM(clientid, sizeof(clientid_t));
842
843         DECODE_TAIL;
844 }
845
846 static __be32
847 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
848                      struct nfsd4_secinfo *secinfo)
849 {
850         DECODE_HEAD;
851
852         READ_BUF(4);
853         READ32(secinfo->si_namelen);
854         READ_BUF(secinfo->si_namelen);
855         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
856         status = check_filename(secinfo->si_name, secinfo->si_namelen,
857                                                                 nfserr_noent);
858         if (status)
859                 return status;
860         DECODE_TAIL;
861 }
862
863 static __be32
864 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
865 {
866         __be32 status;
867
868         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
869         if (status)
870                 return status;
871         return nfsd4_decode_fattr(argp, setattr->sa_bmval, nfsd_attrmask,
872                                   &setattr->sa_iattr, &setattr->sa_acl);
873 }
874
875 static __be32
876 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
877 {
878         DECODE_HEAD;
879
880         READ_BUF(12);
881         COPYMEM(setclientid->se_verf.data, 8);
882         READ32(setclientid->se_namelen);
883
884         READ_BUF(setclientid->se_namelen + 8);
885         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
886         READ32(setclientid->se_callback_prog);
887         READ32(setclientid->se_callback_netid_len);
888
889         READ_BUF(setclientid->se_callback_netid_len + 4);
890         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
891         READ32(setclientid->se_callback_addr_len);
892
893         READ_BUF(setclientid->se_callback_addr_len + 4);
894         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
895         READ32(setclientid->se_callback_ident);
896
897         DECODE_TAIL;
898 }
899
900 static __be32
901 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
902 {
903         DECODE_HEAD;
904
905         READ_BUF(8 + sizeof(nfs4_verifier));
906         COPYMEM(&scd_c->sc_clientid, 8);
907         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
908
909         DECODE_TAIL;
910 }
911
912 /* Also used for NVERIFY */
913 static __be32
914 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
915 {
916 #if 0
917         struct nfsd4_compoundargs save = {
918                 .p = argp->p,
919                 .end = argp->end,
920                 .rqstp = argp->rqstp,
921         };
922         u32             ve_bmval[2];
923         struct iattr    ve_iattr;           /* request */
924         struct nfs4_acl *ve_acl;            /* request */
925 #endif
926         DECODE_HEAD;
927
928         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
929                 goto out;
930
931         /* For convenience's sake, we compare raw xdr'd attributes in
932          * nfsd4_proc_verify; however we still decode here just to return
933          * correct error in case of bad xdr. */
934 #if 0
935         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
936         if (status == nfserr_inval) {
937                 status = nfserrno(status);
938                 goto out;
939         }
940 #endif
941         READ_BUF(4);
942         READ32(verify->ve_attrlen);
943         READ_BUF(verify->ve_attrlen);
944         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
945
946         DECODE_TAIL;
947 }
948
949 static __be32
950 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
951 {
952         int avail;
953         int v;
954         int len;
955         DECODE_HEAD;
956
957         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
958         if (status)
959                 return status;
960         READ_BUF(16);
961         READ64(write->wr_offset);
962         READ32(write->wr_stable_how);
963         if (write->wr_stable_how > 2)
964                 goto xdr_error;
965         READ32(write->wr_buflen);
966
967         /* Sorry .. no magic macros for this.. *
968          * READ_BUF(write->wr_buflen);
969          * SAVEMEM(write->wr_buf, write->wr_buflen);
970          */
971         avail = (char*)argp->end - (char*)argp->p;
972         if (avail + argp->pagelen < write->wr_buflen) {
973                 dprintk("NFSD: xdr error (%s:%d)\n",
974                                 __FILE__, __LINE__);
975                 goto xdr_error;
976         }
977         argp->rqstp->rq_vec[0].iov_base = p;
978         argp->rqstp->rq_vec[0].iov_len = avail;
979         v = 0;
980         len = write->wr_buflen;
981         while (len > argp->rqstp->rq_vec[v].iov_len) {
982                 len -= argp->rqstp->rq_vec[v].iov_len;
983                 v++;
984                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
985                 argp->pagelist++;
986                 if (argp->pagelen >= PAGE_SIZE) {
987                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
988                         argp->pagelen -= PAGE_SIZE;
989                 } else {
990                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
991                         argp->pagelen -= len;
992                 }
993         }
994         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
995         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
996         argp->rqstp->rq_vec[v].iov_len = len;
997         write->wr_vlen = v+1;
998
999         DECODE_TAIL;
1000 }
1001
1002 static __be32
1003 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1004 {
1005         DECODE_HEAD;
1006
1007         READ_BUF(12);
1008         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1009         READ32(rlockowner->rl_owner.len);
1010         READ_BUF(rlockowner->rl_owner.len);
1011         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1012
1013         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1014                 return nfserr_inval;
1015         DECODE_TAIL;
1016 }
1017
1018 static __be32
1019 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1020                          struct nfsd4_exchange_id *exid)
1021 {
1022         int dummy;
1023         DECODE_HEAD;
1024
1025         READ_BUF(NFS4_VERIFIER_SIZE);
1026         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1027
1028         READ_BUF(4);
1029         READ32(exid->clname.len);
1030
1031         READ_BUF(exid->clname.len);
1032         SAVEMEM(exid->clname.data, exid->clname.len);
1033
1034         READ_BUF(4);
1035         READ32(exid->flags);
1036
1037         /* Ignore state_protect4_a */
1038         READ_BUF(4);
1039         READ32(exid->spa_how);
1040         switch (exid->spa_how) {
1041         case SP4_NONE:
1042                 break;
1043         case SP4_MACH_CRED:
1044                 /* spo_must_enforce */
1045                 READ_BUF(4);
1046                 READ32(dummy);
1047                 READ_BUF(dummy * 4);
1048                 p += dummy;
1049
1050                 /* spo_must_allow */
1051                 READ_BUF(4);
1052                 READ32(dummy);
1053                 READ_BUF(dummy * 4);
1054                 p += dummy;
1055                 break;
1056         case SP4_SSV:
1057                 /* ssp_ops */
1058                 READ_BUF(4);
1059                 READ32(dummy);
1060                 READ_BUF(dummy * 4);
1061                 p += dummy;
1062
1063                 READ_BUF(4);
1064                 READ32(dummy);
1065                 READ_BUF(dummy * 4);
1066                 p += dummy;
1067
1068                 /* ssp_hash_algs<> */
1069                 READ_BUF(4);
1070                 READ32(dummy);
1071                 READ_BUF(dummy);
1072                 p += XDR_QUADLEN(dummy);
1073
1074                 /* ssp_encr_algs<> */
1075                 READ_BUF(4);
1076                 READ32(dummy);
1077                 READ_BUF(dummy);
1078                 p += XDR_QUADLEN(dummy);
1079
1080                 /* ssp_window and ssp_num_gss_handles */
1081                 READ_BUF(8);
1082                 READ32(dummy);
1083                 READ32(dummy);
1084                 break;
1085         default:
1086                 goto xdr_error;
1087         }
1088
1089         /* Ignore Implementation ID */
1090         READ_BUF(4);    /* nfs_impl_id4 array length */
1091         READ32(dummy);
1092
1093         if (dummy > 1)
1094                 goto xdr_error;
1095
1096         if (dummy == 1) {
1097                 /* nii_domain */
1098                 READ_BUF(4);
1099                 READ32(dummy);
1100                 READ_BUF(dummy);
1101                 p += XDR_QUADLEN(dummy);
1102
1103                 /* nii_name */
1104                 READ_BUF(4);
1105                 READ32(dummy);
1106                 READ_BUF(dummy);
1107                 p += XDR_QUADLEN(dummy);
1108
1109                 /* nii_date */
1110                 READ_BUF(12);
1111                 p += 3;
1112         }
1113         DECODE_TAIL;
1114 }
1115
1116 static __be32
1117 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1118                             struct nfsd4_create_session *sess)
1119 {
1120         DECODE_HEAD;
1121
1122         u32 dummy;
1123         char *machine_name;
1124         int i;
1125         int nr_secflavs;
1126
1127         READ_BUF(16);
1128         COPYMEM(&sess->clientid, 8);
1129         READ32(sess->seqid);
1130         READ32(sess->flags);
1131
1132         /* Fore channel attrs */
1133         READ_BUF(28);
1134         READ32(dummy); /* headerpadsz is always 0 */
1135         READ32(sess->fore_channel.maxreq_sz);
1136         READ32(sess->fore_channel.maxresp_sz);
1137         READ32(sess->fore_channel.maxresp_cached);
1138         READ32(sess->fore_channel.maxops);
1139         READ32(sess->fore_channel.maxreqs);
1140         READ32(sess->fore_channel.nr_rdma_attrs);
1141         if (sess->fore_channel.nr_rdma_attrs == 1) {
1142                 READ_BUF(4);
1143                 READ32(sess->fore_channel.rdma_attrs);
1144         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1145                 dprintk("Too many fore channel attr bitmaps!\n");
1146                 goto xdr_error;
1147         }
1148
1149         /* Back channel attrs */
1150         READ_BUF(28);
1151         READ32(dummy); /* headerpadsz is always 0 */
1152         READ32(sess->back_channel.maxreq_sz);
1153         READ32(sess->back_channel.maxresp_sz);
1154         READ32(sess->back_channel.maxresp_cached);
1155         READ32(sess->back_channel.maxops);
1156         READ32(sess->back_channel.maxreqs);
1157         READ32(sess->back_channel.nr_rdma_attrs);
1158         if (sess->back_channel.nr_rdma_attrs == 1) {
1159                 READ_BUF(4);
1160                 READ32(sess->back_channel.rdma_attrs);
1161         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1162                 dprintk("Too many back channel attr bitmaps!\n");
1163                 goto xdr_error;
1164         }
1165
1166         READ_BUF(8);
1167         READ32(sess->callback_prog);
1168
1169         /* callback_sec_params4 */
1170         READ32(nr_secflavs);
1171         for (i = 0; i < nr_secflavs; ++i) {
1172                 READ_BUF(4);
1173                 READ32(dummy);
1174                 switch (dummy) {
1175                 case RPC_AUTH_NULL:
1176                         /* Nothing to read */
1177                         break;
1178                 case RPC_AUTH_UNIX:
1179                         READ_BUF(8);
1180                         /* stamp */
1181                         READ32(dummy);
1182
1183                         /* machine name */
1184                         READ32(dummy);
1185                         READ_BUF(dummy);
1186                         SAVEMEM(machine_name, dummy);
1187
1188                         /* uid, gid */
1189                         READ_BUF(8);
1190                         READ32(sess->uid);
1191                         READ32(sess->gid);
1192
1193                         /* more gids */
1194                         READ_BUF(4);
1195                         READ32(dummy);
1196                         READ_BUF(dummy * 4);
1197                         for (i = 0; i < dummy; ++i)
1198                                 READ32(dummy);
1199                         break;
1200                 case RPC_AUTH_GSS:
1201                         dprintk("RPC_AUTH_GSS callback secflavor "
1202                                 "not supported!\n");
1203                         READ_BUF(8);
1204                         /* gcbp_service */
1205                         READ32(dummy);
1206                         /* gcbp_handle_from_server */
1207                         READ32(dummy);
1208                         READ_BUF(dummy);
1209                         p += XDR_QUADLEN(dummy);
1210                         /* gcbp_handle_from_client */
1211                         READ_BUF(4);
1212                         READ32(dummy);
1213                         READ_BUF(dummy);
1214                         p += XDR_QUADLEN(dummy);
1215                         break;
1216                 default:
1217                         dprintk("Illegal callback secflavor\n");
1218                         return nfserr_inval;
1219                 }
1220         }
1221         DECODE_TAIL;
1222 }
1223
1224 static __be32
1225 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1226                              struct nfsd4_destroy_session *destroy_session)
1227 {
1228         DECODE_HEAD;
1229         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1230         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1231
1232         DECODE_TAIL;
1233 }
1234
1235 static __be32
1236 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1237                       struct nfsd4_sequence *seq)
1238 {
1239         DECODE_HEAD;
1240
1241         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1242         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1243         READ32(seq->seqid);
1244         READ32(seq->slotid);
1245         READ32(seq->maxslots);
1246         READ32(seq->cachethis);
1247
1248         DECODE_TAIL;
1249 }
1250
1251 static __be32
1252 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1253 {
1254         return nfs_ok;
1255 }
1256
1257 static __be32
1258 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1259 {
1260         return nfserr_notsupp;
1261 }
1262
1263 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1264
1265 static nfsd4_dec nfsd4_dec_ops[] = {
1266         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1267         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1268         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1269         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1270         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1271         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1272         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1273         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1274         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1275         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1276         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1277         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1278         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1279         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1280         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1281         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1282         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1283         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1284         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1285         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1286         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1287         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1288         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1289         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1290         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1291         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1292         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1293         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1294         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1295         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1296         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1297         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1298         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1299         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1300         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1301         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1302         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1303 };
1304
1305 static nfsd4_dec nfsd41_dec_ops[] = {
1306         [OP_ACCESS]             (nfsd4_dec)nfsd4_decode_access,
1307         [OP_CLOSE]              (nfsd4_dec)nfsd4_decode_close,
1308         [OP_COMMIT]             (nfsd4_dec)nfsd4_decode_commit,
1309         [OP_CREATE]             (nfsd4_dec)nfsd4_decode_create,
1310         [OP_DELEGPURGE]         (nfsd4_dec)nfsd4_decode_notsupp,
1311         [OP_DELEGRETURN]        (nfsd4_dec)nfsd4_decode_delegreturn,
1312         [OP_GETATTR]            (nfsd4_dec)nfsd4_decode_getattr,
1313         [OP_GETFH]              (nfsd4_dec)nfsd4_decode_noop,
1314         [OP_LINK]               (nfsd4_dec)nfsd4_decode_link,
1315         [OP_LOCK]               (nfsd4_dec)nfsd4_decode_lock,
1316         [OP_LOCKT]              (nfsd4_dec)nfsd4_decode_lockt,
1317         [OP_LOCKU]              (nfsd4_dec)nfsd4_decode_locku,
1318         [OP_LOOKUP]             (nfsd4_dec)nfsd4_decode_lookup,
1319         [OP_LOOKUPP]            (nfsd4_dec)nfsd4_decode_noop,
1320         [OP_NVERIFY]            (nfsd4_dec)nfsd4_decode_verify,
1321         [OP_OPEN]               (nfsd4_dec)nfsd4_decode_open,
1322         [OP_OPENATTR]           (nfsd4_dec)nfsd4_decode_notsupp,
1323         [OP_OPEN_CONFIRM]       (nfsd4_dec)nfsd4_decode_notsupp,
1324         [OP_OPEN_DOWNGRADE]     (nfsd4_dec)nfsd4_decode_open_downgrade,
1325         [OP_PUTFH]              (nfsd4_dec)nfsd4_decode_putfh,
1326         [OP_PUTPUBFH]           (nfsd4_dec)nfsd4_decode_notsupp,
1327         [OP_PUTROOTFH]          (nfsd4_dec)nfsd4_decode_noop,
1328         [OP_READ]               (nfsd4_dec)nfsd4_decode_read,
1329         [OP_READDIR]            (nfsd4_dec)nfsd4_decode_readdir,
1330         [OP_READLINK]           (nfsd4_dec)nfsd4_decode_noop,
1331         [OP_REMOVE]             (nfsd4_dec)nfsd4_decode_remove,
1332         [OP_RENAME]             (nfsd4_dec)nfsd4_decode_rename,
1333         [OP_RENEW]              (nfsd4_dec)nfsd4_decode_notsupp,
1334         [OP_RESTOREFH]          (nfsd4_dec)nfsd4_decode_noop,
1335         [OP_SAVEFH]             (nfsd4_dec)nfsd4_decode_noop,
1336         [OP_SECINFO]            (nfsd4_dec)nfsd4_decode_secinfo,
1337         [OP_SETATTR]            (nfsd4_dec)nfsd4_decode_setattr,
1338         [OP_SETCLIENTID]        (nfsd4_dec)nfsd4_decode_notsupp,
1339         [OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
1340         [OP_VERIFY]             (nfsd4_dec)nfsd4_decode_verify,
1341         [OP_WRITE]              (nfsd4_dec)nfsd4_decode_write,
1342         [OP_RELEASE_LOCKOWNER]  (nfsd4_dec)nfsd4_decode_notsupp,
1343
1344         /* new operations for NFSv4.1 */
1345         [OP_BACKCHANNEL_CTL]    (nfsd4_dec)nfsd4_decode_notsupp,
1346         [OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
1347         [OP_EXCHANGE_ID]        (nfsd4_dec)nfsd4_decode_exchange_id,
1348         [OP_CREATE_SESSION]     (nfsd4_dec)nfsd4_decode_create_session,
1349         [OP_DESTROY_SESSION]    (nfsd4_dec)nfsd4_decode_destroy_session,
1350         [OP_FREE_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1351         [OP_GET_DIR_DELEGATION] (nfsd4_dec)nfsd4_decode_notsupp,
1352         [OP_GETDEVICEINFO]      (nfsd4_dec)nfsd4_decode_notsupp,
1353         [OP_GETDEVICELIST]      (nfsd4_dec)nfsd4_decode_notsupp,
1354         [OP_LAYOUTCOMMIT]       (nfsd4_dec)nfsd4_decode_notsupp,
1355         [OP_LAYOUTGET]          (nfsd4_dec)nfsd4_decode_notsupp,
1356         [OP_LAYOUTRETURN]       (nfsd4_dec)nfsd4_decode_notsupp,
1357         [OP_SECINFO_NO_NAME]    (nfsd4_dec)nfsd4_decode_notsupp,
1358         [OP_SEQUENCE]           (nfsd4_dec)nfsd4_decode_sequence,
1359         [OP_SET_SSV]            (nfsd4_dec)nfsd4_decode_notsupp,
1360         [OP_TEST_STATEID]       (nfsd4_dec)nfsd4_decode_notsupp,
1361         [OP_WANT_DELEGATION]    (nfsd4_dec)nfsd4_decode_notsupp,
1362         [OP_DESTROY_CLIENTID]   (nfsd4_dec)nfsd4_decode_notsupp,
1363         [OP_RECLAIM_COMPLETE]   (nfsd4_dec)nfsd4_decode_notsupp,
1364 };
1365
1366 struct nfsd4_minorversion_ops {
1367         nfsd4_dec *decoders;
1368         int nops;
1369 };
1370
1371 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1372         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1373         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1374 };
1375
1376 static __be32
1377 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1378 {
1379         DECODE_HEAD;
1380         struct nfsd4_op *op;
1381         struct nfsd4_minorversion_ops *ops;
1382         int i;
1383
1384         /*
1385          * XXX: According to spec, we should check the tag
1386          * for UTF-8 compliance.  I'm postponing this for
1387          * now because it seems that some clients do use
1388          * binary tags.
1389          */
1390         READ_BUF(4);
1391         READ32(argp->taglen);
1392         READ_BUF(argp->taglen + 8);
1393         SAVEMEM(argp->tag, argp->taglen);
1394         READ32(argp->minorversion);
1395         READ32(argp->opcnt);
1396
1397         if (argp->taglen > NFSD4_MAX_TAGLEN)
1398                 goto xdr_error;
1399         if (argp->opcnt > 100)
1400                 goto xdr_error;
1401
1402         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1403                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1404                 if (!argp->ops) {
1405                         argp->ops = argp->iops;
1406                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1407                         goto xdr_error;
1408                 }
1409         }
1410
1411         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1412                 argp->opcnt = 0;
1413
1414         ops = &nfsd4_minorversion[argp->minorversion];
1415         for (i = 0; i < argp->opcnt; i++) {
1416                 op = &argp->ops[i];
1417                 op->replay = NULL;
1418
1419                 /*
1420                  * We can't use READ_BUF() here because we need to handle
1421                  * a missing opcode as an OP_WRITE + 1. So we need to check
1422                  * to see if we're truly at the end of our buffer or if there
1423                  * is another page we need to flip to.
1424                  */
1425
1426                 if (argp->p == argp->end) {
1427                         if (argp->pagelen < 4) {
1428                                 /* There isn't an opcode still on the wire */
1429                                 op->opnum = OP_WRITE + 1;
1430                                 op->status = nfserr_bad_xdr;
1431                                 argp->opcnt = i+1;
1432                                 break;
1433                         }
1434
1435                         /*
1436                          * False alarm. We just hit a page boundary, but there
1437                          * is still data available.  Move pointer across page
1438                          * boundary.  *snip from READ_BUF*
1439                          */
1440                         argp->p = page_address(argp->pagelist[0]);
1441                         argp->pagelist++;
1442                         if (argp->pagelen < PAGE_SIZE) {
1443                                 argp->end = p + (argp->pagelen>>2);
1444                                 argp->pagelen = 0;
1445                         } else {
1446                                 argp->end = p + (PAGE_SIZE>>2);
1447                                 argp->pagelen -= PAGE_SIZE;
1448                         }
1449                 }
1450                 op->opnum = ntohl(*argp->p++);
1451
1452                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1453                         op->status = ops->decoders[op->opnum](argp, &op->u);
1454                 else {
1455                         op->opnum = OP_ILLEGAL;
1456                         op->status = nfserr_op_illegal;
1457                 }
1458
1459                 if (op->status) {
1460                         argp->opcnt = i+1;
1461                         break;
1462                 }
1463         }
1464
1465         DECODE_TAIL;
1466 }
1467 /*
1468  * END OF "GENERIC" DECODE ROUTINES.
1469  */
1470
1471 /*
1472  * START OF "GENERIC" ENCODE ROUTINES.
1473  *   These may look a little ugly since they are imported from a "generic"
1474  * set of XDR encode/decode routines which are intended to be shared by
1475  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1476  *
1477  * If the pain of reading these is too great, it should be a straightforward
1478  * task to translate them into Linux-specific versions which are more
1479  * consistent with the style used in NFSv2/v3...
1480  */
1481 #define ENCODE_HEAD              __be32 *p
1482
1483 #define WRITE32(n)               *p++ = htonl(n)
1484 #define WRITE64(n)               do {                           \
1485         *p++ = htonl((u32)((n) >> 32));                         \
1486         *p++ = htonl((u32)(n));                                 \
1487 } while (0)
1488 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1489         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1490         memcpy(p, ptr, nbytes);                                 \
1491         p += XDR_QUADLEN(nbytes);                               \
1492 }} while (0)
1493 #define WRITECINFO(c)           do {                            \
1494         *p++ = htonl(c.atomic);                                 \
1495         *p++ = htonl(c.before_ctime_sec);                               \
1496         *p++ = htonl(c.before_ctime_nsec);                              \
1497         *p++ = htonl(c.after_ctime_sec);                                \
1498         *p++ = htonl(c.after_ctime_nsec);                               \
1499 } while (0)
1500
1501 #define RESERVE_SPACE(nbytes)   do {                            \
1502         p = resp->p;                                            \
1503         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1504 } while (0)
1505 #define ADJUST_ARGS()           resp->p = p
1506
1507 /*
1508  * Header routine to setup seqid operation replay cache
1509  */
1510 #define ENCODE_SEQID_OP_HEAD                                    \
1511         __be32 *save;                                           \
1512                                                                 \
1513         save = resp->p;
1514
1515 /*
1516  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1517  * is where sequence id's are incremented, and the replay cache is filled.
1518  * Note that we increment sequence id's here, at the last moment, so we're sure
1519  * we know whether the error to be returned is a sequence id mutating error.
1520  */
1521
1522 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1523         if (seqid_mutating_err(nfserr) && stateowner) {         \
1524                 stateowner->so_seqid++;                         \
1525                 stateowner->so_replay.rp_status = nfserr;       \
1526                 stateowner->so_replay.rp_buflen =               \
1527                           (((char *)(resp)->p - (char *)save)); \
1528                 memcpy(stateowner->so_replay.rp_buf, save,      \
1529                         stateowner->so_replay.rp_buflen);       \
1530         } } while (0);
1531
1532 /* Encode as an array of strings the string given with components
1533  * seperated @sep.
1534  */
1535 static __be32 nfsd4_encode_components(char sep, char *components,
1536                                    __be32 **pp, int *buflen)
1537 {
1538         __be32 *p = *pp;
1539         __be32 *countp = p;
1540         int strlen, count=0;
1541         char *str, *end;
1542
1543         dprintk("nfsd4_encode_components(%s)\n", components);
1544         if ((*buflen -= 4) < 0)
1545                 return nfserr_resource;
1546         WRITE32(0); /* We will fill this in with @count later */
1547         end = str = components;
1548         while (*end) {
1549                 for (; *end && (*end != sep); end++)
1550                         ; /* Point to end of component */
1551                 strlen = end - str;
1552                 if (strlen) {
1553                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1554                                 return nfserr_resource;
1555                         WRITE32(strlen);
1556                         WRITEMEM(str, strlen);
1557                         count++;
1558                 }
1559                 else
1560                         end++;
1561                 str = end;
1562         }
1563         *pp = p;
1564         p = countp;
1565         WRITE32(count);
1566         return 0;
1567 }
1568
1569 /*
1570  * encode a location element of a fs_locations structure
1571  */
1572 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1573                                     __be32 **pp, int *buflen)
1574 {
1575         __be32 status;
1576         __be32 *p = *pp;
1577
1578         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1579         if (status)
1580                 return status;
1581         status = nfsd4_encode_components('/', location->path, &p, buflen);
1582         if (status)
1583                 return status;
1584         *pp = p;
1585         return 0;
1586 }
1587
1588 /*
1589  * Return the path to an export point in the pseudo filesystem namespace
1590  * Returned string is safe to use as long as the caller holds a reference
1591  * to @exp.
1592  */
1593 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1594 {
1595         struct svc_fh tmp_fh;
1596         char *path, *rootpath;
1597
1598         fh_init(&tmp_fh, NFS4_FHSIZE);
1599         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1600         if (*stat)
1601                 return NULL;
1602         rootpath = tmp_fh.fh_export->ex_pathname;
1603
1604         path = exp->ex_pathname;
1605
1606         if (strncmp(path, rootpath, strlen(rootpath))) {
1607                 dprintk("nfsd: fs_locations failed;"
1608                         "%s is not contained in %s\n", path, rootpath);
1609                 *stat = nfserr_notsupp;
1610                 return NULL;
1611         }
1612
1613         return path + strlen(rootpath);
1614 }
1615
1616 /*
1617  *  encode a fs_locations structure
1618  */
1619 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1620                                      struct svc_export *exp,
1621                                      __be32 **pp, int *buflen)
1622 {
1623         __be32 status;
1624         int i;
1625         __be32 *p = *pp;
1626         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1627         char *root = nfsd4_path(rqstp, exp, &status);
1628
1629         if (status)
1630                 return status;
1631         status = nfsd4_encode_components('/', root, &p, buflen);
1632         if (status)
1633                 return status;
1634         if ((*buflen -= 4) < 0)
1635                 return nfserr_resource;
1636         WRITE32(fslocs->locations_count);
1637         for (i=0; i<fslocs->locations_count; i++) {
1638                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1639                                                    &p, buflen);
1640                 if (status)
1641                         return status;
1642         }
1643         *pp = p;
1644         return 0;
1645 }
1646
1647 static u32 nfs4_ftypes[16] = {
1648         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1649         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1650         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1651         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1652 };
1653
1654 static __be32
1655 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1656                         __be32 **p, int *buflen)
1657 {
1658         int status;
1659
1660         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1661                 return nfserr_resource;
1662         if (whotype != NFS4_ACL_WHO_NAMED)
1663                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1664         else if (group)
1665                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1666         else
1667                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1668         if (status < 0)
1669                 return nfserrno(status);
1670         *p = xdr_encode_opaque(*p, NULL, status);
1671         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1672         BUG_ON(*buflen < 0);
1673         return 0;
1674 }
1675
1676 static inline __be32
1677 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1678 {
1679         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1680 }
1681
1682 static inline __be32
1683 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1684 {
1685         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1686 }
1687
1688 static inline __be32
1689 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1690                 __be32 **p, int *buflen)
1691 {
1692         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1693 }
1694
1695 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1696                               FATTR4_WORD0_RDATTR_ERROR)
1697 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1698
1699 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1700 {
1701         /* As per referral draft:  */
1702         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1703             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1704                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1705                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1706                         *rdattr_err = NFSERR_MOVED;
1707                 else
1708                         return nfserr_moved;
1709         }
1710         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1711         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1712         return 0;
1713 }
1714
1715 /*
1716  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1717  * ourselves.
1718  *
1719  * @countp is the buffer size in _words_; upon successful return this becomes
1720  * replaced with the number of words written.
1721  */
1722 __be32
1723 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1724                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1725                 struct svc_rqst *rqstp, int ignore_crossmnt)
1726 {
1727         u32 bmval0 = bmval[0];
1728         u32 bmval1 = bmval[1];
1729         struct kstat stat;
1730         struct svc_fh tempfh;
1731         struct kstatfs statfs;
1732         int buflen = *countp << 2;
1733         __be32 *attrlenp;
1734         u32 dummy;
1735         u64 dummy64;
1736         u32 rdattr_err = 0;
1737         __be32 *p = buffer;
1738         __be32 status;
1739         int err;
1740         int aclsupport = 0;
1741         struct nfs4_acl *acl = NULL;
1742
1743         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1744         BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1745         BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1746
1747         if (exp->ex_fslocs.migrated) {
1748                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1749                 if (status)
1750                         goto out;
1751         }
1752
1753         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1754         if (err)
1755                 goto out_nfserr;
1756         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1757                         FATTR4_WORD0_MAXNAME)) ||
1758             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1759                        FATTR4_WORD1_SPACE_TOTAL))) {
1760                 err = vfs_statfs(dentry, &statfs);
1761                 if (err)
1762                         goto out_nfserr;
1763         }
1764         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1765                 fh_init(&tempfh, NFS4_FHSIZE);
1766                 status = fh_compose(&tempfh, exp, dentry, NULL);
1767                 if (status)
1768                         goto out;
1769                 fhp = &tempfh;
1770         }
1771         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1772                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1773                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1774                 aclsupport = (err == 0);
1775                 if (bmval0 & FATTR4_WORD0_ACL) {
1776                         if (err == -EOPNOTSUPP)
1777                                 bmval0 &= ~FATTR4_WORD0_ACL;
1778                         else if (err == -EINVAL) {
1779                                 status = nfserr_attrnotsupp;
1780                                 goto out;
1781                         } else if (err != 0)
1782                                 goto out_nfserr;
1783                 }
1784         }
1785         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1786                 if (exp->ex_fslocs.locations == NULL) {
1787                         bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1788                 }
1789         }
1790         if ((buflen -= 16) < 0)
1791                 goto out_resource;
1792
1793         WRITE32(2);
1794         WRITE32(bmval0);
1795         WRITE32(bmval1);
1796         attrlenp = p++;                /* to be backfilled later */
1797
1798         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1799                 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1800                 if ((buflen -= 12) < 0)
1801                         goto out_resource;
1802                 if (!aclsupport)
1803                         word0 &= ~FATTR4_WORD0_ACL;
1804                 if (!exp->ex_fslocs.locations)
1805                         word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1806                 WRITE32(2);
1807                 WRITE32(word0);
1808                 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1809         }
1810         if (bmval0 & FATTR4_WORD0_TYPE) {
1811                 if ((buflen -= 4) < 0)
1812                         goto out_resource;
1813                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1814                 if (dummy == NF4BAD)
1815                         goto out_serverfault;
1816                 WRITE32(dummy);
1817         }
1818         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1819                 if ((buflen -= 4) < 0)
1820                         goto out_resource;
1821                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1822                         WRITE32(NFS4_FH_PERSISTENT);
1823                 else
1824                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1825         }
1826         if (bmval0 & FATTR4_WORD0_CHANGE) {
1827                 /*
1828                  * Note: This _must_ be consistent with the scheme for writing
1829                  * change_info, so any changes made here must be reflected there
1830                  * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
1831                  * macro above.)
1832                  */
1833                 if ((buflen -= 8) < 0)
1834                         goto out_resource;
1835                 WRITE32(stat.ctime.tv_sec);
1836                 WRITE32(stat.ctime.tv_nsec);
1837         }
1838         if (bmval0 & FATTR4_WORD0_SIZE) {
1839                 if ((buflen -= 8) < 0)
1840                         goto out_resource;
1841                 WRITE64(stat.size);
1842         }
1843         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1844                 if ((buflen -= 4) < 0)
1845                         goto out_resource;
1846                 WRITE32(1);
1847         }
1848         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1849                 if ((buflen -= 4) < 0)
1850                         goto out_resource;
1851                 WRITE32(1);
1852         }
1853         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1854                 if ((buflen -= 4) < 0)
1855                         goto out_resource;
1856                 WRITE32(0);
1857         }
1858         if (bmval0 & FATTR4_WORD0_FSID) {
1859                 if ((buflen -= 16) < 0)
1860                         goto out_resource;
1861                 if (exp->ex_fslocs.migrated) {
1862                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1863                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1864                 } else switch(fsid_source(fhp)) {
1865                 case FSIDSOURCE_FSID:
1866                         WRITE64((u64)exp->ex_fsid);
1867                         WRITE64((u64)0);
1868                         break;
1869                 case FSIDSOURCE_DEV:
1870                         WRITE32(0);
1871                         WRITE32(MAJOR(stat.dev));
1872                         WRITE32(0);
1873                         WRITE32(MINOR(stat.dev));
1874                         break;
1875                 case FSIDSOURCE_UUID:
1876                         WRITEMEM(exp->ex_uuid, 16);
1877                         break;
1878                 }
1879         }
1880         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1881                 if ((buflen -= 4) < 0)
1882                         goto out_resource;
1883                 WRITE32(0);
1884         }
1885         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1886                 if ((buflen -= 4) < 0)
1887                         goto out_resource;
1888                 WRITE32(NFSD_LEASE_TIME);
1889         }
1890         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1891                 if ((buflen -= 4) < 0)
1892                         goto out_resource;
1893                 WRITE32(rdattr_err);
1894         }
1895         if (bmval0 & FATTR4_WORD0_ACL) {
1896                 struct nfs4_ace *ace;
1897
1898                 if (acl == NULL) {
1899                         if ((buflen -= 4) < 0)
1900                                 goto out_resource;
1901
1902                         WRITE32(0);
1903                         goto out_acl;
1904                 }
1905                 if ((buflen -= 4) < 0)
1906                         goto out_resource;
1907                 WRITE32(acl->naces);
1908
1909                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1910                         if ((buflen -= 4*3) < 0)
1911                                 goto out_resource;
1912                         WRITE32(ace->type);
1913                         WRITE32(ace->flag);
1914                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1915                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1916                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1917                                 &p, &buflen);
1918                         if (status == nfserr_resource)
1919                                 goto out_resource;
1920                         if (status)
1921                                 goto out;
1922                 }
1923         }
1924 out_acl:
1925         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1926                 if ((buflen -= 4) < 0)
1927                         goto out_resource;
1928                 WRITE32(aclsupport ?
1929                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1930         }
1931         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1932                 if ((buflen -= 4) < 0)
1933                         goto out_resource;
1934                 WRITE32(1);
1935         }
1936         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1937                 if ((buflen -= 4) < 0)
1938                         goto out_resource;
1939                 WRITE32(1);
1940         }
1941         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1942                 if ((buflen -= 4) < 0)
1943                         goto out_resource;
1944                 WRITE32(1);
1945         }
1946         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1947                 if ((buflen -= 4) < 0)
1948                         goto out_resource;
1949                 WRITE32(1);
1950         }
1951         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1952                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1953                 if (buflen < 0)
1954                         goto out_resource;
1955                 WRITE32(fhp->fh_handle.fh_size);
1956                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1957         }
1958         if (bmval0 & FATTR4_WORD0_FILEID) {
1959                 if ((buflen -= 8) < 0)
1960                         goto out_resource;
1961                 WRITE64(stat.ino);
1962         }
1963         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1964                 if ((buflen -= 8) < 0)
1965                         goto out_resource;
1966                 WRITE64((u64) statfs.f_ffree);
1967         }
1968         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1969                 if ((buflen -= 8) < 0)
1970                         goto out_resource;
1971                 WRITE64((u64) statfs.f_ffree);
1972         }
1973         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1974                 if ((buflen -= 8) < 0)
1975                         goto out_resource;
1976                 WRITE64((u64) statfs.f_files);
1977         }
1978         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1979                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1980                 if (status == nfserr_resource)
1981                         goto out_resource;
1982                 if (status)
1983                         goto out;
1984         }
1985         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1986                 if ((buflen -= 4) < 0)
1987                         goto out_resource;
1988                 WRITE32(1);
1989         }
1990         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1991                 if ((buflen -= 8) < 0)
1992                         goto out_resource;
1993                 WRITE64(~(u64)0);
1994         }
1995         if (bmval0 & FATTR4_WORD0_MAXLINK) {
1996                 if ((buflen -= 4) < 0)
1997                         goto out_resource;
1998                 WRITE32(255);
1999         }
2000         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2001                 if ((buflen -= 4) < 0)
2002                         goto out_resource;
2003                 WRITE32(statfs.f_namelen);
2004         }
2005         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2006                 if ((buflen -= 8) < 0)
2007                         goto out_resource;
2008                 WRITE64((u64) svc_max_payload(rqstp));
2009         }
2010         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2011                 if ((buflen -= 8) < 0)
2012                         goto out_resource;
2013                 WRITE64((u64) svc_max_payload(rqstp));
2014         }
2015         if (bmval1 & FATTR4_WORD1_MODE) {
2016                 if ((buflen -= 4) < 0)
2017                         goto out_resource;
2018                 WRITE32(stat.mode & S_IALLUGO);
2019         }
2020         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2021                 if ((buflen -= 4) < 0)
2022                         goto out_resource;
2023                 WRITE32(1);
2024         }
2025         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2026                 if ((buflen -= 4) < 0)
2027                         goto out_resource;
2028                 WRITE32(stat.nlink);
2029         }
2030         if (bmval1 & FATTR4_WORD1_OWNER) {
2031                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2032                 if (status == nfserr_resource)
2033                         goto out_resource;
2034                 if (status)
2035                         goto out;
2036         }
2037         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2038                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2039                 if (status == nfserr_resource)
2040                         goto out_resource;
2041                 if (status)
2042                         goto out;
2043         }
2044         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2045                 if ((buflen -= 8) < 0)
2046                         goto out_resource;
2047                 WRITE32((u32) MAJOR(stat.rdev));
2048                 WRITE32((u32) MINOR(stat.rdev));
2049         }
2050         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2051                 if ((buflen -= 8) < 0)
2052                         goto out_resource;
2053                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2054                 WRITE64(dummy64);
2055         }
2056         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2057                 if ((buflen -= 8) < 0)
2058                         goto out_resource;
2059                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2060                 WRITE64(dummy64);
2061         }
2062         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2063                 if ((buflen -= 8) < 0)
2064                         goto out_resource;
2065                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2066                 WRITE64(dummy64);
2067         }
2068         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2069                 if ((buflen -= 8) < 0)
2070                         goto out_resource;
2071                 dummy64 = (u64)stat.blocks << 9;
2072                 WRITE64(dummy64);
2073         }
2074         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2075                 if ((buflen -= 12) < 0)
2076                         goto out_resource;
2077                 WRITE32(0);
2078                 WRITE32(stat.atime.tv_sec);
2079                 WRITE32(stat.atime.tv_nsec);
2080         }
2081         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2082                 if ((buflen -= 12) < 0)
2083                         goto out_resource;
2084                 WRITE32(0);
2085                 WRITE32(1);
2086                 WRITE32(0);
2087         }
2088         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2089                 if ((buflen -= 12) < 0)
2090                         goto out_resource;
2091                 WRITE32(0);
2092                 WRITE32(stat.ctime.tv_sec);
2093                 WRITE32(stat.ctime.tv_nsec);
2094         }
2095         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2096                 if ((buflen -= 12) < 0)
2097                         goto out_resource;
2098                 WRITE32(0);
2099                 WRITE32(stat.mtime.tv_sec);
2100                 WRITE32(stat.mtime.tv_nsec);
2101         }
2102         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2103                 if ((buflen -= 8) < 0)
2104                         goto out_resource;
2105                 /*
2106                  * Get parent's attributes if not ignoring crossmount
2107                  * and this is the root of a cross-mounted filesystem.
2108                  */
2109                 if (ignore_crossmnt == 0 &&
2110                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2111                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2112                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2113                         if (err)
2114                                 goto out_nfserr;
2115                 }
2116                 WRITE64(stat.ino);
2117         }
2118         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2119         *countp = p - buffer;
2120         status = nfs_ok;
2121
2122 out:
2123         kfree(acl);
2124         if (fhp == &tempfh)
2125                 fh_put(&tempfh);
2126         return status;
2127 out_nfserr:
2128         status = nfserrno(err);
2129         goto out;
2130 out_resource:
2131         *countp = 0;
2132         status = nfserr_resource;
2133         goto out;
2134 out_serverfault:
2135         status = nfserr_serverfault;
2136         goto out;
2137 }
2138
2139 static inline int attributes_need_mount(u32 *bmval)
2140 {
2141         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2142                 return 1;
2143         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2144                 return 1;
2145         return 0;
2146 }
2147
2148 static __be32
2149 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2150                 const char *name, int namlen, __be32 *p, int *buflen)
2151 {
2152         struct svc_export *exp = cd->rd_fhp->fh_export;
2153         struct dentry *dentry;
2154         __be32 nfserr;
2155         int ignore_crossmnt = 0;
2156
2157         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2158         if (IS_ERR(dentry))
2159                 return nfserrno(PTR_ERR(dentry));
2160
2161         exp_get(exp);
2162         /*
2163          * In the case of a mountpoint, the client may be asking for
2164          * attributes that are only properties of the underlying filesystem
2165          * as opposed to the cross-mounted file system. In such a case,
2166          * we will not follow the cross mount and will fill the attribtutes
2167          * directly from the mountpoint dentry.
2168          */
2169         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2170                 ignore_crossmnt = 1;
2171         else if (d_mountpoint(dentry)) {
2172                 int err;
2173
2174                 /*
2175                  * Why the heck aren't we just using nfsd_lookup??
2176                  * Different "."/".." handling?  Something else?
2177                  * At least, add a comment here to explain....
2178                  */
2179                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2180                 if (err) {
2181                         nfserr = nfserrno(err);
2182                         goto out_put;
2183                 }
2184                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2185                 if (nfserr)
2186                         goto out_put;
2187
2188         }
2189         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2190                                         cd->rd_rqstp, ignore_crossmnt);
2191 out_put:
2192         dput(dentry);
2193         exp_put(exp);
2194         return nfserr;
2195 }
2196
2197 static __be32 *
2198 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2199 {
2200         __be32 *attrlenp;
2201
2202         if (buflen < 6)
2203                 return NULL;
2204         *p++ = htonl(2);
2205         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2206         *p++ = htonl(0);                         /* bmval1 */
2207
2208         attrlenp = p++;
2209         *p++ = nfserr;       /* no htonl */
2210         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2211         return p;
2212 }
2213
2214 static int
2215 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2216                     loff_t offset, u64 ino, unsigned int d_type)
2217 {
2218         struct readdir_cd *ccd = ccdv;
2219         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2220         int buflen;
2221         __be32 *p = cd->buffer;
2222         __be32 nfserr = nfserr_toosmall;
2223
2224         /* In nfsv4, "." and ".." never make it onto the wire.. */
2225         if (name && isdotent(name, namlen)) {
2226                 cd->common.err = nfs_ok;
2227                 return 0;
2228         }
2229
2230         if (cd->offset)
2231                 xdr_encode_hyper(cd->offset, (u64) offset);
2232
2233         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2234         if (buflen < 0)
2235                 goto fail;
2236
2237         *p++ = xdr_one;                             /* mark entry present */
2238         cd->offset = p;                             /* remember pointer */
2239         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2240         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2241
2242         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2243         switch (nfserr) {
2244         case nfs_ok:
2245                 p += buflen;
2246                 break;
2247         case nfserr_resource:
2248                 nfserr = nfserr_toosmall;
2249                 goto fail;
2250         case nfserr_dropit:
2251                 goto fail;
2252         default:
2253                 /*
2254                  * If the client requested the RDATTR_ERROR attribute,
2255                  * we stuff the error code into this attribute
2256                  * and continue.  If this attribute was not requested,
2257                  * then in accordance with the spec, we fail the
2258                  * entire READDIR operation(!)
2259                  */
2260                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2261                         goto fail;
2262                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2263                 if (p == NULL) {
2264                         nfserr = nfserr_toosmall;
2265                         goto fail;
2266                 }
2267         }
2268         cd->buflen -= (p - cd->buffer);
2269         cd->buffer = p;
2270         cd->common.err = nfs_ok;
2271         return 0;
2272 fail:
2273         cd->common.err = nfserr;
2274         return -EINVAL;
2275 }
2276
2277 static void
2278 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2279 {
2280         ENCODE_HEAD;
2281
2282         RESERVE_SPACE(sizeof(stateid_t));
2283         WRITE32(sid->si_generation);
2284         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2285         ADJUST_ARGS();
2286 }
2287
2288 static __be32
2289 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2290 {
2291         ENCODE_HEAD;
2292
2293         if (!nfserr) {
2294                 RESERVE_SPACE(8);
2295                 WRITE32(access->ac_supported);
2296                 WRITE32(access->ac_resp_access);
2297                 ADJUST_ARGS();
2298         }
2299         return nfserr;
2300 }
2301
2302 static __be32
2303 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2304 {
2305         ENCODE_SEQID_OP_HEAD;
2306
2307         if (!nfserr)
2308                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2309
2310         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2311         return nfserr;
2312 }
2313
2314
2315 static __be32
2316 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2317 {
2318         ENCODE_HEAD;
2319
2320         if (!nfserr) {
2321                 RESERVE_SPACE(8);
2322                 WRITEMEM(commit->co_verf.data, 8);
2323                 ADJUST_ARGS();
2324         }
2325         return nfserr;
2326 }
2327
2328 static __be32
2329 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2330 {
2331         ENCODE_HEAD;
2332
2333         if (!nfserr) {
2334                 RESERVE_SPACE(32);
2335                 WRITECINFO(create->cr_cinfo);
2336                 WRITE32(2);
2337                 WRITE32(create->cr_bmval[0]);
2338                 WRITE32(create->cr_bmval[1]);
2339                 ADJUST_ARGS();
2340         }
2341         return nfserr;
2342 }
2343
2344 static __be32
2345 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2346 {
2347         struct svc_fh *fhp = getattr->ga_fhp;
2348         int buflen;
2349
2350         if (nfserr)
2351                 return nfserr;
2352
2353         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2354         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2355                                     resp->p, &buflen, getattr->ga_bmval,
2356                                     resp->rqstp, 0);
2357         if (!nfserr)
2358                 resp->p += buflen;
2359         return nfserr;
2360 }
2361
2362 static __be32
2363 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2364 {
2365         struct svc_fh *fhp = *fhpp;
2366         unsigned int len;
2367         ENCODE_HEAD;
2368
2369         if (!nfserr) {
2370                 len = fhp->fh_handle.fh_size;
2371                 RESERVE_SPACE(len + 4);
2372                 WRITE32(len);
2373                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2374                 ADJUST_ARGS();
2375         }
2376         return nfserr;
2377 }
2378
2379 /*
2380 * Including all fields other than the name, a LOCK4denied structure requires
2381 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2382 */
2383 static void
2384 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2385 {
2386         ENCODE_HEAD;
2387
2388         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2389         WRITE64(ld->ld_start);
2390         WRITE64(ld->ld_length);
2391         WRITE32(ld->ld_type);
2392         if (ld->ld_sop) {
2393                 WRITEMEM(&ld->ld_clientid, 8);
2394                 WRITE32(ld->ld_sop->so_owner.len);
2395                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2396                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2397         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2398                 WRITE64((u64)0); /* clientid */
2399                 WRITE32(0); /* length of owner name */
2400         }
2401         ADJUST_ARGS();
2402 }
2403
2404 static __be32
2405 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2406 {
2407         ENCODE_SEQID_OP_HEAD;
2408
2409         if (!nfserr)
2410                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2411         else if (nfserr == nfserr_denied)
2412                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2413
2414         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2415         return nfserr;
2416 }
2417
2418 static __be32
2419 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2420 {
2421         if (nfserr == nfserr_denied)
2422                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2423         return nfserr;
2424 }
2425
2426 static __be32
2427 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2428 {
2429         ENCODE_SEQID_OP_HEAD;
2430
2431         if (!nfserr)
2432                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2433
2434         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2435         return nfserr;
2436 }
2437
2438
2439 static __be32
2440 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2441 {
2442         ENCODE_HEAD;
2443
2444         if (!nfserr) {
2445                 RESERVE_SPACE(20);
2446                 WRITECINFO(link->li_cinfo);
2447                 ADJUST_ARGS();
2448         }
2449         return nfserr;
2450 }
2451
2452
2453 static __be32
2454 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2455 {
2456         ENCODE_HEAD;
2457         ENCODE_SEQID_OP_HEAD;
2458
2459         if (nfserr)
2460                 goto out;
2461
2462         nfsd4_encode_stateid(resp, &open->op_stateid);
2463         RESERVE_SPACE(40);
2464         WRITECINFO(open->op_cinfo);
2465         WRITE32(open->op_rflags);
2466         WRITE32(2);
2467         WRITE32(open->op_bmval[0]);
2468         WRITE32(open->op_bmval[1]);
2469         WRITE32(open->op_delegate_type);
2470         ADJUST_ARGS();
2471
2472         switch (open->op_delegate_type) {
2473         case NFS4_OPEN_DELEGATE_NONE:
2474                 break;
2475         case NFS4_OPEN_DELEGATE_READ:
2476                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2477                 RESERVE_SPACE(20);
2478                 WRITE32(open->op_recall);
2479
2480                 /*
2481                  * TODO: ACE's in delegations
2482                  */
2483                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2484                 WRITE32(0);
2485                 WRITE32(0);
2486                 WRITE32(0);   /* XXX: is NULL principal ok? */
2487                 ADJUST_ARGS();
2488                 break;
2489         case NFS4_OPEN_DELEGATE_WRITE:
2490                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2491                 RESERVE_SPACE(32);
2492                 WRITE32(0);
2493
2494                 /*
2495                  * TODO: space_limit's in delegations
2496                  */
2497                 WRITE32(NFS4_LIMIT_SIZE);
2498                 WRITE32(~(u32)0);
2499                 WRITE32(~(u32)0);
2500
2501                 /*
2502                  * TODO: ACE's in delegations
2503                  */
2504                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2505                 WRITE32(0);
2506                 WRITE32(0);
2507                 WRITE32(0);   /* XXX: is NULL principal ok? */
2508                 ADJUST_ARGS();
2509                 break;
2510         default:
2511                 BUG();
2512         }
2513         /* XXX save filehandle here */
2514 out:
2515         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2516         return nfserr;
2517 }
2518
2519 static __be32
2520 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2521 {
2522         ENCODE_SEQID_OP_HEAD;
2523
2524         if (!nfserr)
2525                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2526
2527         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2528         return nfserr;
2529 }
2530
2531 static __be32
2532 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2533 {
2534         ENCODE_SEQID_OP_HEAD;
2535
2536         if (!nfserr)
2537                 nfsd4_encode_stateid(resp, &od->od_stateid);
2538
2539         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2540         return nfserr;
2541 }
2542
2543 static __be32
2544 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2545                   struct nfsd4_read *read)
2546 {
2547         u32 eof;
2548         int v, pn;
2549         unsigned long maxcount; 
2550         long len;
2551         ENCODE_HEAD;
2552
2553         if (nfserr)
2554                 return nfserr;
2555         if (resp->xbuf->page_len)
2556                 return nfserr_resource;
2557
2558         RESERVE_SPACE(8); /* eof flag and byte count */
2559
2560         maxcount = svc_max_payload(resp->rqstp);
2561         if (maxcount > read->rd_length)
2562                 maxcount = read->rd_length;
2563
2564         len = maxcount;
2565         v = 0;
2566         while (len > 0) {
2567                 pn = resp->rqstp->rq_resused++;
2568                 resp->rqstp->rq_vec[v].iov_base =
2569                         page_address(resp->rqstp->rq_respages[pn]);
2570                 resp->rqstp->rq_vec[v].iov_len =
2571                         len < PAGE_SIZE ? len : PAGE_SIZE;
2572                 v++;
2573                 len -= PAGE_SIZE;
2574         }
2575         read->rd_vlen = v;
2576
2577         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2578                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2579                         &maxcount);
2580
2581         if (nfserr == nfserr_symlink)
2582                 nfserr = nfserr_inval;
2583         if (nfserr)
2584                 return nfserr;
2585         eof = (read->rd_offset + maxcount >=
2586                read->rd_fhp->fh_dentry->d_inode->i_size);
2587
2588         WRITE32(eof);
2589         WRITE32(maxcount);
2590         ADJUST_ARGS();
2591         resp->xbuf->head[0].iov_len = (char*)p
2592                                         - (char*)resp->xbuf->head[0].iov_base;
2593         resp->xbuf->page_len = maxcount;
2594
2595         /* Use rest of head for padding and remaining ops: */
2596         resp->xbuf->tail[0].iov_base = p;
2597         resp->xbuf->tail[0].iov_len = 0;
2598         if (maxcount&3) {
2599                 RESERVE_SPACE(4);
2600                 WRITE32(0);
2601                 resp->xbuf->tail[0].iov_base += maxcount&3;
2602                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2603                 ADJUST_ARGS();
2604         }
2605         return 0;
2606 }
2607
2608 static __be32
2609 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2610 {
2611         int maxcount;
2612         char *page;
2613         ENCODE_HEAD;
2614
2615         if (nfserr)
2616                 return nfserr;
2617         if (resp->xbuf->page_len)
2618                 return nfserr_resource;
2619
2620         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2621
2622         maxcount = PAGE_SIZE;
2623         RESERVE_SPACE(4);
2624
2625         /*
2626          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2627          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2628          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2629          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2630          */
2631         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2632         if (nfserr == nfserr_isdir)
2633                 return nfserr_inval;
2634         if (nfserr)
2635                 return nfserr;
2636
2637         WRITE32(maxcount);
2638         ADJUST_ARGS();
2639         resp->xbuf->head[0].iov_len = (char*)p
2640                                 - (char*)resp->xbuf->head[0].iov_base;
2641         resp->xbuf->page_len = maxcount;
2642
2643         /* Use rest of head for padding and remaining ops: */
2644         resp->xbuf->tail[0].iov_base = p;
2645         resp->xbuf->tail[0].iov_len = 0;
2646         if (maxcount&3) {
2647                 RESERVE_SPACE(4);
2648                 WRITE32(0);
2649                 resp->xbuf->tail[0].iov_base += maxcount&3;
2650                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2651                 ADJUST_ARGS();
2652         }
2653         return 0;
2654 }
2655
2656 static __be32
2657 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2658 {
2659         int maxcount;
2660         loff_t offset;
2661         __be32 *page, *savep, *tailbase;
2662         ENCODE_HEAD;
2663
2664         if (nfserr)
2665                 return nfserr;
2666         if (resp->xbuf->page_len)
2667                 return nfserr_resource;
2668
2669         RESERVE_SPACE(8);  /* verifier */
2670         savep = p;
2671
2672         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2673         WRITE32(0);
2674         WRITE32(0);
2675         ADJUST_ARGS();
2676         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2677         tailbase = p;
2678
2679         maxcount = PAGE_SIZE;
2680         if (maxcount > readdir->rd_maxcount)
2681                 maxcount = readdir->rd_maxcount;
2682
2683         /*
2684          * Convert from bytes to words, account for the two words already
2685          * written, make sure to leave two words at the end for the next
2686          * pointer and eof field.
2687          */
2688         maxcount = (maxcount >> 2) - 4;
2689         if (maxcount < 0) {
2690                 nfserr =  nfserr_toosmall;
2691                 goto err_no_verf;
2692         }
2693
2694         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2695         readdir->common.err = 0;
2696         readdir->buflen = maxcount;
2697         readdir->buffer = page;
2698         readdir->offset = NULL;
2699
2700         offset = readdir->rd_cookie;
2701         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2702                               &offset,
2703                               &readdir->common, nfsd4_encode_dirent);
2704         if (nfserr == nfs_ok &&
2705             readdir->common.err == nfserr_toosmall &&
2706             readdir->buffer == page) 
2707                 nfserr = nfserr_toosmall;
2708         if (nfserr == nfserr_symlink)
2709                 nfserr = nfserr_notdir;
2710         if (nfserr)
2711                 goto err_no_verf;
2712
2713         if (readdir->offset)
2714                 xdr_encode_hyper(readdir->offset, offset);
2715
2716         p = readdir->buffer;
2717         *p++ = 0;       /* no more entries */
2718         *p++ = htonl(readdir->common.err == nfserr_eof);
2719         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2720                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2721
2722         /* Use rest of head for padding and remaining ops: */
2723         resp->xbuf->tail[0].iov_base = tailbase;
2724         resp->xbuf->tail[0].iov_len = 0;
2725         resp->p = resp->xbuf->tail[0].iov_base;
2726         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2727
2728         return 0;
2729 err_no_verf:
2730         p = savep;
2731         ADJUST_ARGS();
2732         return nfserr;
2733 }
2734
2735 static __be32
2736 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2737 {
2738         ENCODE_HEAD;
2739
2740         if (!nfserr) {
2741                 RESERVE_SPACE(20);
2742                 WRITECINFO(remove->rm_cinfo);
2743                 ADJUST_ARGS();
2744         }
2745         return nfserr;
2746 }
2747
2748 static __be32
2749 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2750 {
2751         ENCODE_HEAD;
2752
2753         if (!nfserr) {
2754                 RESERVE_SPACE(40);
2755                 WRITECINFO(rename->rn_sinfo);
2756                 WRITECINFO(rename->rn_tinfo);
2757                 ADJUST_ARGS();
2758         }
2759         return nfserr;
2760 }
2761
2762 static __be32
2763 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2764                      struct nfsd4_secinfo *secinfo)
2765 {
2766         int i = 0;
2767         struct svc_export *exp = secinfo->si_exp;
2768         u32 nflavs;
2769         struct exp_flavor_info *flavs;
2770         struct exp_flavor_info def_flavs[2];
2771         ENCODE_HEAD;
2772
2773         if (nfserr)
2774                 goto out;
2775         if (exp->ex_nflavors) {
2776                 flavs = exp->ex_flavors;
2777                 nflavs = exp->ex_nflavors;
2778         } else { /* Handling of some defaults in absence of real secinfo: */
2779                 flavs = def_flavs;
2780                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2781                         nflavs = 2;
2782                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2783                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2784                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2785                         nflavs = 1;
2786                         flavs[0].pseudoflavor
2787                                         = svcauth_gss_flavor(exp->ex_client);
2788                 } else {
2789                         nflavs = 1;
2790                         flavs[0].pseudoflavor
2791                                         = exp->ex_client->flavour->flavour;
2792                 }
2793         }
2794
2795         RESERVE_SPACE(4);
2796         WRITE32(nflavs);
2797         ADJUST_ARGS();
2798         for (i = 0; i < nflavs; i++) {
2799                 u32 flav = flavs[i].pseudoflavor;
2800                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2801
2802                 if (gm) {
2803                         RESERVE_SPACE(4);
2804                         WRITE32(RPC_AUTH_GSS);
2805                         ADJUST_ARGS();
2806                         RESERVE_SPACE(4 + gm->gm_oid.len);
2807                         WRITE32(gm->gm_oid.len);
2808                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2809                         ADJUST_ARGS();
2810                         RESERVE_SPACE(4);
2811                         WRITE32(0); /* qop */
2812                         ADJUST_ARGS();
2813                         RESERVE_SPACE(4);
2814                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2815                         ADJUST_ARGS();
2816                         gss_mech_put(gm);
2817                 } else {
2818                         RESERVE_SPACE(4);
2819                         WRITE32(flav);
2820                         ADJUST_ARGS();
2821                 }
2822         }
2823 out:
2824         if (exp)
2825                 exp_put(exp);
2826         return nfserr;
2827 }
2828
2829 /*
2830  * The SETATTR encode routine is special -- it always encodes a bitmap,
2831  * regardless of the error status.
2832  */
2833 static __be32
2834 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2835 {
2836         ENCODE_HEAD;
2837
2838         RESERVE_SPACE(12);
2839         if (nfserr) {
2840                 WRITE32(2);
2841                 WRITE32(0);
2842                 WRITE32(0);
2843         }
2844         else {
2845                 WRITE32(2);
2846                 WRITE32(setattr->sa_bmval[0]);
2847                 WRITE32(setattr->sa_bmval[1]);
2848         }
2849         ADJUST_ARGS();
2850         return nfserr;
2851 }
2852
2853 static __be32
2854 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2855 {
2856         ENCODE_HEAD;
2857
2858         if (!nfserr) {
2859                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2860                 WRITEMEM(&scd->se_clientid, 8);
2861                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2862                 ADJUST_ARGS();
2863         }
2864         else if (nfserr == nfserr_clid_inuse) {
2865                 RESERVE_SPACE(8);
2866                 WRITE32(0);
2867                 WRITE32(0);
2868                 ADJUST_ARGS();
2869         }
2870         return nfserr;
2871 }
2872
2873 static __be32
2874 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2875 {
2876         ENCODE_HEAD;
2877
2878         if (!nfserr) {
2879                 RESERVE_SPACE(16);
2880                 WRITE32(write->wr_bytes_written);
2881                 WRITE32(write->wr_how_written);
2882                 WRITEMEM(write->wr_verifier.data, 8);
2883                 ADJUST_ARGS();
2884         }
2885         return nfserr;
2886 }
2887
2888 static __be32
2889 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2890                          struct nfsd4_exchange_id *exid)
2891 {
2892         ENCODE_HEAD;
2893         char *major_id;
2894         char *server_scope;
2895         int major_id_sz;
2896         int server_scope_sz;
2897         uint64_t minor_id = 0;
2898
2899         if (nfserr)
2900                 return nfserr;
2901
2902         major_id = utsname()->nodename;
2903         major_id_sz = strlen(major_id);
2904         server_scope = utsname()->nodename;
2905         server_scope_sz = strlen(server_scope);
2906
2907         RESERVE_SPACE(
2908                 8 /* eir_clientid */ +
2909                 4 /* eir_sequenceid */ +
2910                 4 /* eir_flags */ +
2911                 4 /* spr_how (SP4_NONE) */ +
2912                 8 /* so_minor_id */ +
2913                 4 /* so_major_id.len */ +
2914                 (XDR_QUADLEN(major_id_sz) * 4) +
2915                 4 /* eir_server_scope.len */ +
2916                 (XDR_QUADLEN(server_scope_sz) * 4) +
2917                 4 /* eir_server_impl_id.count (0) */);
2918
2919         WRITEMEM(&exid->clientid, 8);
2920         WRITE32(exid->seqid);
2921         WRITE32(exid->flags);
2922
2923         /* state_protect4_r. Currently only support SP4_NONE */
2924         BUG_ON(exid->spa_how != SP4_NONE);
2925         WRITE32(exid->spa_how);
2926
2927         /* The server_owner struct */
2928         WRITE64(minor_id);      /* Minor id */
2929         /* major id */
2930         WRITE32(major_id_sz);
2931         WRITEMEM(major_id, major_id_sz);
2932
2933         /* Server scope */
2934         WRITE32(server_scope_sz);
2935         WRITEMEM(server_scope, server_scope_sz);
2936
2937         /* Implementation id */
2938         WRITE32(0);     /* zero length nfs_impl_id4 array */
2939         ADJUST_ARGS();
2940         return 0;
2941 }
2942
2943 static __be32
2944 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2945                             struct nfsd4_create_session *sess)
2946 {
2947         ENCODE_HEAD;
2948
2949         if (nfserr)
2950                 return nfserr;
2951
2952         RESERVE_SPACE(24);
2953         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2954         WRITE32(sess->seqid);
2955         WRITE32(sess->flags);
2956         ADJUST_ARGS();
2957
2958         RESERVE_SPACE(28);
2959         WRITE32(0); /* headerpadsz */
2960         WRITE32(sess->fore_channel.maxreq_sz);
2961         WRITE32(sess->fore_channel.maxresp_sz);
2962         WRITE32(sess->fore_channel.maxresp_cached);
2963         WRITE32(sess->fore_channel.maxops);
2964         WRITE32(sess->fore_channel.maxreqs);
2965         WRITE32(sess->fore_channel.nr_rdma_attrs);
2966         ADJUST_ARGS();
2967
2968         if (sess->fore_channel.nr_rdma_attrs) {
2969                 RESERVE_SPACE(4);
2970                 WRITE32(sess->fore_channel.rdma_attrs);
2971                 ADJUST_ARGS();
2972         }
2973
2974         RESERVE_SPACE(28);
2975         WRITE32(0); /* headerpadsz */
2976         WRITE32(sess->back_channel.maxreq_sz);
2977         WRITE32(sess->back_channel.maxresp_sz);
2978         WRITE32(sess->back_channel.maxresp_cached);
2979         WRITE32(sess->back_channel.maxops);
2980         WRITE32(sess->back_channel.maxreqs);
2981         WRITE32(sess->back_channel.nr_rdma_attrs);
2982         ADJUST_ARGS();
2983
2984         if (sess->back_channel.nr_rdma_attrs) {
2985                 RESERVE_SPACE(4);
2986                 WRITE32(sess->back_channel.rdma_attrs);
2987                 ADJUST_ARGS();
2988         }
2989         return 0;
2990 }
2991
2992 static __be32
2993 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
2994                              struct nfsd4_destroy_session *destroy_session)
2995 {
2996         return nfserr;
2997 }
2998
2999 __be32
3000 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3001                       struct nfsd4_sequence *seq)
3002 {
3003         ENCODE_HEAD;
3004
3005         if (nfserr)
3006                 return nfserr;
3007
3008         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3009         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3010         WRITE32(seq->seqid);
3011         WRITE32(seq->slotid);
3012         WRITE32(seq->maxslots);
3013         /*
3014          * FIXME: for now:
3015          *   target_maxslots = maxslots
3016          *   status_flags = 0
3017          */
3018         WRITE32(seq->maxslots);
3019         WRITE32(0);
3020
3021         ADJUST_ARGS();
3022         return 0;
3023 }
3024
3025 static __be32
3026 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3027 {
3028         return nfserr;
3029 }
3030
3031 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3032
3033 /*
3034  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3035  * since we don't need to filter out obsolete ops as this is
3036  * done in the decoding phase.
3037  */
3038 static nfsd4_enc nfsd4_enc_ops[] = {
3039         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3040         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3041         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3042         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3043         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3044         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3045         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3046         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3047         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3048         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3049         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3050         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3051         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3052         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3053         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3054         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3055         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3056         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3057         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3058         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3059         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3060         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3061         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3062         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3063         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3064         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3065         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3066         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3067         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3068         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3069         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3070         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3071         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3072         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3073         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3074         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3075         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3076
3077         /* NFSv4.1 operations */
3078         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3079         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3080         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3081         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3082         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3083         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3084         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3085         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3086         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3087         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3088         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3089         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3090         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3091         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3092         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3093         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3094         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3095         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3096         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3097 };
3098
3099 /*
3100  * Calculate the total amount of memory that the compound response has taken
3101  * after encoding the current operation.
3102  *
3103  * pad: add on 8 bytes for the next operation's op_code and status so that
3104  * there is room to cache a failure on the next operation.
3105  *
3106  * Compare this length to the session se_fmaxresp_cached.
3107  *
3108  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3109  * will be at least a page and will therefore hold the xdr_buf head.
3110  */
3111 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3112 {
3113         int status = 0;
3114         struct xdr_buf *xb = &resp->rqstp->rq_res;
3115         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3116         struct nfsd4_session *session = NULL;
3117         struct nfsd4_slot *slot = resp->cstate.slot;
3118         u32 length, tlen = 0, pad = 8;
3119
3120         if (!nfsd4_has_session(&resp->cstate))
3121                 return status;
3122
3123         session = resp->cstate.session;
3124         if (session == NULL || slot->sl_cache_entry.ce_cachethis == 0)
3125                 return status;
3126
3127         if (resp->opcnt >= args->opcnt)
3128                 pad = 0; /* this is the last operation */
3129
3130         if (xb->page_len == 0) {
3131                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3132         } else {
3133                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3134                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3135
3136                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3137         }
3138         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3139                 length, xb->page_len, tlen, pad);
3140
3141         if (length <= session->se_fmaxresp_cached)
3142                 return status;
3143         else
3144                 return nfserr_rep_too_big_to_cache;
3145 }
3146
3147 void
3148 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3149 {
3150         __be32 *statp;
3151         ENCODE_HEAD;
3152
3153         RESERVE_SPACE(8);
3154         WRITE32(op->opnum);
3155         statp = p++;    /* to be backfilled at the end */
3156         ADJUST_ARGS();
3157
3158         if (op->opnum == OP_ILLEGAL)
3159                 goto status;
3160         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3161                !nfsd4_enc_ops[op->opnum]);
3162         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3163         /* nfsd4_check_drc_limit guarantees enough room for error status */
3164         if (!op->status && nfsd4_check_drc_limit(resp))
3165                 op->status = nfserr_rep_too_big_to_cache;
3166 status:
3167         /*
3168          * Note: We write the status directly, instead of using WRITE32(),
3169          * since it is already in network byte order.
3170          */
3171         *statp = op->status;
3172 }
3173
3174 /* 
3175  * Encode the reply stored in the stateowner reply cache 
3176  * 
3177  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3178  * previously sent already encoded operation.
3179  *
3180  * called with nfs4_lock_state() held
3181  */
3182 void
3183 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3184 {
3185         ENCODE_HEAD;
3186         struct nfs4_replay *rp = op->replay;
3187
3188         BUG_ON(!rp);
3189
3190         RESERVE_SPACE(8);
3191         WRITE32(op->opnum);
3192         *p++ = rp->rp_status;  /* already xdr'ed */
3193         ADJUST_ARGS();
3194
3195         RESERVE_SPACE(rp->rp_buflen);
3196         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3197         ADJUST_ARGS();
3198 }
3199
3200 /*
3201  * END OF "GENERIC" ENCODE ROUTINES.
3202  */
3203
3204 int
3205 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3206 {
3207         return xdr_ressize_check(rqstp, p);
3208 }
3209
3210 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3211 {
3212         if (args->ops != args->iops) {
3213                 kfree(args->ops);
3214                 args->ops = args->iops;
3215         }
3216         kfree(args->tmpp);
3217         args->tmpp = NULL;
3218         while (args->to_free) {
3219                 struct tmpbuf *tb = args->to_free;
3220                 args->to_free = tb->next;
3221                 tb->release(tb->buf);
3222                 kfree(tb);
3223         }
3224 }
3225
3226 int
3227 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3228 {
3229         __be32 status;
3230
3231         args->p = p;
3232         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3233         args->pagelist = rqstp->rq_arg.pages;
3234         args->pagelen = rqstp->rq_arg.page_len;
3235         args->tmpp = NULL;
3236         args->to_free = NULL;
3237         args->ops = args->iops;
3238         args->rqstp = rqstp;
3239
3240         status = nfsd4_decode_compound(args);
3241         if (status) {
3242                 nfsd4_release_compoundargs(args);
3243         }
3244         return !status;
3245 }
3246
3247 int
3248 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3249 {
3250         /*
3251          * All that remains is to write the tag and operation count...
3252          */
3253         struct kvec *iov;
3254         p = resp->tagp;
3255         *p++ = htonl(resp->taglen);
3256         memcpy(p, resp->tag, resp->taglen);
3257         p += XDR_QUADLEN(resp->taglen);
3258         *p++ = htonl(resp->opcnt);
3259
3260         if (rqstp->rq_res.page_len) 
3261                 iov = &rqstp->rq_res.tail[0];
3262         else
3263                 iov = &rqstp->rq_res.head[0];
3264         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3265         BUG_ON(iov->iov_len > PAGE_SIZE);
3266         if (nfsd4_has_session(&resp->cstate)) {
3267                 if (resp->cstate.status == nfserr_replay_cache &&
3268                                 !nfsd4_not_cached(resp)) {
3269                         iov->iov_len = resp->cstate.iovlen;
3270                 } else {
3271                         nfsd4_store_cache_entry(resp);
3272                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3273                         resp->cstate.slot->sl_inuse = 0;
3274                 }
3275                 if (resp->cstate.session)
3276                         nfsd4_put_session(resp->cstate.session);
3277         }
3278         return 1;
3279 }
3280
3281 /*
3282  * Local variables:
3283  *  c-basic-offset: 8
3284  * End:
3285  */