Merge branch 'for-3.10' of git://linux-nfs.org/~bfields/linux
[linux-3.10.git] / fs / nfsd / nfs4xdr.c
1 /*
2  *  Server-side XDR for NFSv4
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  *
35  * TODO: Neil Brown made the following observation:  We currently
36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
37  * never release any of that until the request is complete.
38  * It would be good to calculate a new maximum response size while
39  * decoding the COMPOUND, and call svc_reserve with this number
40  * at the end of nfs4svc_decode_compoundargs.
41  */
42
43 #include <linux/slab.h>
44 #include <linux/namei.h>
45 #include <linux/statfs.h>
46 #include <linux/utsname.h>
47 #include <linux/pagemap.h>
48 #include <linux/sunrpc/svcauth_gss.h>
49
50 #include "idmap.h"
51 #include "acl.h"
52 #include "xdr4.h"
53 #include "vfs.h"
54 #include "state.h"
55 #include "cache.h"
56 #include "netns.h"
57
58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
59
60 /*
61  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
62  * directory in order to indicate to the client that a filesystem boundary is present
63  * We use a fixed fsid for a referral
64  */
65 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
66 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
67
68 static __be32
69 check_filename(char *str, int len)
70 {
71         int i;
72
73         if (len == 0)
74                 return nfserr_inval;
75         if (isdotent(str, len))
76                 return nfserr_badname;
77         for (i = 0; i < len; i++)
78                 if (str[i] == '/')
79                         return nfserr_badname;
80         return 0;
81 }
82
83 #define DECODE_HEAD                             \
84         __be32 *p;                              \
85         __be32 status
86 #define DECODE_TAIL                             \
87         status = 0;                             \
88 out:                                            \
89         return status;                          \
90 xdr_error:                                      \
91         dprintk("NFSD: xdr error (%s:%d)\n",    \
92                         __FILE__, __LINE__);    \
93         status = nfserr_bad_xdr;                \
94         goto out
95
96 #define READ32(x)         (x) = ntohl(*p++)
97 #define READ64(x)         do {                  \
98         (x) = (u64)ntohl(*p++) << 32;           \
99         (x) |= ntohl(*p++);                     \
100 } while (0)
101 #define READTIME(x)       do {                  \
102         p++;                                    \
103         (x) = ntohl(*p++);                      \
104         p++;                                    \
105 } while (0)
106 #define READMEM(x,nbytes) do {                  \
107         x = (char *)p;                          \
108         p += XDR_QUADLEN(nbytes);               \
109 } while (0)
110 #define SAVEMEM(x,nbytes) do {                  \
111         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
112                 savemem(argp, p, nbytes) :      \
113                 (char *)p)) {                   \
114                 dprintk("NFSD: xdr error (%s:%d)\n", \
115                                 __FILE__, __LINE__); \
116                 goto xdr_error;                 \
117                 }                               \
118         p += XDR_QUADLEN(nbytes);               \
119 } while (0)
120 #define COPYMEM(x,nbytes) do {                  \
121         memcpy((x), p, nbytes);                 \
122         p += XDR_QUADLEN(nbytes);               \
123 } while (0)
124
125 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
126 #define READ_BUF(nbytes)  do {                  \
127         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
128                 p = argp->p;                    \
129                 argp->p += XDR_QUADLEN(nbytes); \
130         } else if (!(p = read_buf(argp, nbytes))) { \
131                 dprintk("NFSD: xdr error (%s:%d)\n", \
132                                 __FILE__, __LINE__); \
133                 goto xdr_error;                 \
134         }                                       \
135 } while (0)
136
137 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
138 {
139         /* We want more bytes than seem to be available.
140          * Maybe we need a new page, maybe we have just run out
141          */
142         unsigned int avail = (char *)argp->end - (char *)argp->p;
143         __be32 *p;
144         if (avail + argp->pagelen < nbytes)
145                 return NULL;
146         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
147                 return NULL;
148         /* ok, we can do it with the current plus the next page */
149         if (nbytes <= sizeof(argp->tmp))
150                 p = argp->tmp;
151         else {
152                 kfree(argp->tmpp);
153                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
154                 if (!p)
155                         return NULL;
156                 
157         }
158         /*
159          * The following memcpy is safe because read_buf is always
160          * called with nbytes > avail, and the two cases above both
161          * guarantee p points to at least nbytes bytes.
162          */
163         memcpy(p, argp->p, avail);
164         /* step to next page */
165         argp->p = page_address(argp->pagelist[0]);
166         argp->pagelist++;
167         if (argp->pagelen < PAGE_SIZE) {
168                 argp->end = argp->p + (argp->pagelen>>2);
169                 argp->pagelen = 0;
170         } else {
171                 argp->end = argp->p + (PAGE_SIZE>>2);
172                 argp->pagelen -= PAGE_SIZE;
173         }
174         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
175         argp->p += XDR_QUADLEN(nbytes - avail);
176         return p;
177 }
178
179 static int zero_clientid(clientid_t *clid)
180 {
181         return (clid->cl_boot == 0) && (clid->cl_id == 0);
182 }
183
184 static int
185 defer_free(struct nfsd4_compoundargs *argp,
186                 void (*release)(const void *), void *p)
187 {
188         struct tmpbuf *tb;
189
190         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
191         if (!tb)
192                 return -ENOMEM;
193         tb->buf = p;
194         tb->release = release;
195         tb->next = argp->to_free;
196         argp->to_free = tb;
197         return 0;
198 }
199
200 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
201 {
202         if (p == argp->tmp) {
203                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
204                 if (!p)
205                         return NULL;
206         } else {
207                 BUG_ON(p != argp->tmpp);
208                 argp->tmpp = NULL;
209         }
210         if (defer_free(argp, kfree, p)) {
211                 kfree(p);
212                 return NULL;
213         } else
214                 return (char *)p;
215 }
216
217 static __be32
218 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
219 {
220         u32 bmlen;
221         DECODE_HEAD;
222
223         bmval[0] = 0;
224         bmval[1] = 0;
225         bmval[2] = 0;
226
227         READ_BUF(4);
228         READ32(bmlen);
229         if (bmlen > 1000)
230                 goto xdr_error;
231
232         READ_BUF(bmlen << 2);
233         if (bmlen > 0)
234                 READ32(bmval[0]);
235         if (bmlen > 1)
236                 READ32(bmval[1]);
237         if (bmlen > 2)
238                 READ32(bmval[2]);
239
240         DECODE_TAIL;
241 }
242
243 static __be32
244 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
245                    struct iattr *iattr, struct nfs4_acl **acl)
246 {
247         int expected_len, len = 0;
248         u32 dummy32;
249         char *buf;
250         int host_err;
251
252         DECODE_HEAD;
253         iattr->ia_valid = 0;
254         if ((status = nfsd4_decode_bitmap(argp, bmval)))
255                 return status;
256
257         READ_BUF(4);
258         READ32(expected_len);
259
260         if (bmval[0] & FATTR4_WORD0_SIZE) {
261                 READ_BUF(8);
262                 len += 8;
263                 READ64(iattr->ia_size);
264                 iattr->ia_valid |= ATTR_SIZE;
265         }
266         if (bmval[0] & FATTR4_WORD0_ACL) {
267                 u32 nace;
268                 struct nfs4_ace *ace;
269
270                 READ_BUF(4); len += 4;
271                 READ32(nace);
272
273                 if (nace > NFS4_ACL_MAX)
274                         return nfserr_resource;
275
276                 *acl = nfs4_acl_new(nace);
277                 if (*acl == NULL) {
278                         host_err = -ENOMEM;
279                         goto out_nfserr;
280                 }
281                 defer_free(argp, kfree, *acl);
282
283                 (*acl)->naces = nace;
284                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
285                         READ_BUF(16); len += 16;
286                         READ32(ace->type);
287                         READ32(ace->flag);
288                         READ32(ace->access_mask);
289                         READ32(dummy32);
290                         READ_BUF(dummy32);
291                         len += XDR_QUADLEN(dummy32) << 2;
292                         READMEM(buf, dummy32);
293                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
294                         status = nfs_ok;
295                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
296                                 ;
297                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
298                                 status = nfsd_map_name_to_gid(argp->rqstp,
299                                                 buf, dummy32, &ace->who_gid);
300                         else
301                                 status = nfsd_map_name_to_uid(argp->rqstp,
302                                                 buf, dummy32, &ace->who_uid);
303                         if (status)
304                                 return status;
305                 }
306         } else
307                 *acl = NULL;
308         if (bmval[1] & FATTR4_WORD1_MODE) {
309                 READ_BUF(4);
310                 len += 4;
311                 READ32(iattr->ia_mode);
312                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
313                 iattr->ia_valid |= ATTR_MODE;
314         }
315         if (bmval[1] & FATTR4_WORD1_OWNER) {
316                 READ_BUF(4);
317                 len += 4;
318                 READ32(dummy32);
319                 READ_BUF(dummy32);
320                 len += (XDR_QUADLEN(dummy32) << 2);
321                 READMEM(buf, dummy32);
322                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
323                         return status;
324                 iattr->ia_valid |= ATTR_UID;
325         }
326         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
327                 READ_BUF(4);
328                 len += 4;
329                 READ32(dummy32);
330                 READ_BUF(dummy32);
331                 len += (XDR_QUADLEN(dummy32) << 2);
332                 READMEM(buf, dummy32);
333                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
334                         return status;
335                 iattr->ia_valid |= ATTR_GID;
336         }
337         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
338                 READ_BUF(4);
339                 len += 4;
340                 READ32(dummy32);
341                 switch (dummy32) {
342                 case NFS4_SET_TO_CLIENT_TIME:
343                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
344                            all 32 bits of 'nseconds'. */
345                         READ_BUF(12);
346                         len += 12;
347                         READ64(iattr->ia_atime.tv_sec);
348                         READ32(iattr->ia_atime.tv_nsec);
349                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
350                                 return nfserr_inval;
351                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
352                         break;
353                 case NFS4_SET_TO_SERVER_TIME:
354                         iattr->ia_valid |= ATTR_ATIME;
355                         break;
356                 default:
357                         goto xdr_error;
358                 }
359         }
360         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
361                 READ_BUF(4);
362                 len += 4;
363                 READ32(dummy32);
364                 switch (dummy32) {
365                 case NFS4_SET_TO_CLIENT_TIME:
366                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
367                            all 32 bits of 'nseconds'. */
368                         READ_BUF(12);
369                         len += 12;
370                         READ64(iattr->ia_mtime.tv_sec);
371                         READ32(iattr->ia_mtime.tv_nsec);
372                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
373                                 return nfserr_inval;
374                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
375                         break;
376                 case NFS4_SET_TO_SERVER_TIME:
377                         iattr->ia_valid |= ATTR_MTIME;
378                         break;
379                 default:
380                         goto xdr_error;
381                 }
382         }
383         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
384             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
385             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
386                 READ_BUF(expected_len - len);
387         else if (len != expected_len)
388                 goto xdr_error;
389
390         DECODE_TAIL;
391
392 out_nfserr:
393         status = nfserrno(host_err);
394         goto out;
395 }
396
397 static __be32
398 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
399 {
400         DECODE_HEAD;
401
402         READ_BUF(sizeof(stateid_t));
403         READ32(sid->si_generation);
404         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
405
406         DECODE_TAIL;
407 }
408
409 static __be32
410 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
411 {
412         DECODE_HEAD;
413
414         READ_BUF(4);
415         READ32(access->ac_req_access);
416
417         DECODE_TAIL;
418 }
419
420 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
421 {
422         DECODE_HEAD;
423         u32 dummy, uid, gid;
424         char *machine_name;
425         int i;
426         int nr_secflavs;
427
428         /* callback_sec_params4 */
429         READ_BUF(4);
430         READ32(nr_secflavs);
431         cbs->flavor = (u32)(-1);
432         for (i = 0; i < nr_secflavs; ++i) {
433                 READ_BUF(4);
434                 READ32(dummy);
435                 switch (dummy) {
436                 case RPC_AUTH_NULL:
437                         /* Nothing to read */
438                         if (cbs->flavor == (u32)(-1))
439                                 cbs->flavor = RPC_AUTH_NULL;
440                         break;
441                 case RPC_AUTH_UNIX:
442                         READ_BUF(8);
443                         /* stamp */
444                         READ32(dummy);
445
446                         /* machine name */
447                         READ32(dummy);
448                         READ_BUF(dummy);
449                         SAVEMEM(machine_name, dummy);
450
451                         /* uid, gid */
452                         READ_BUF(8);
453                         READ32(uid);
454                         READ32(gid);
455
456                         /* more gids */
457                         READ_BUF(4);
458                         READ32(dummy);
459                         READ_BUF(dummy * 4);
460                         if (cbs->flavor == (u32)(-1)) {
461                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
462                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
463                                 if (uid_valid(kuid) && gid_valid(kgid)) {
464                                         cbs->uid = kuid;
465                                         cbs->gid = kgid;
466                                         cbs->flavor = RPC_AUTH_UNIX;
467                                 } else {
468                                         dprintk("RPC_AUTH_UNIX with invalid"
469                                                 "uid or gid ignoring!\n");
470                                 }
471                         }
472                         break;
473                 case RPC_AUTH_GSS:
474                         dprintk("RPC_AUTH_GSS callback secflavor "
475                                 "not supported!\n");
476                         READ_BUF(8);
477                         /* gcbp_service */
478                         READ32(dummy);
479                         /* gcbp_handle_from_server */
480                         READ32(dummy);
481                         READ_BUF(dummy);
482                         p += XDR_QUADLEN(dummy);
483                         /* gcbp_handle_from_client */
484                         READ_BUF(4);
485                         READ32(dummy);
486                         READ_BUF(dummy);
487                         break;
488                 default:
489                         dprintk("Illegal callback secflavor\n");
490                         return nfserr_inval;
491                 }
492         }
493         DECODE_TAIL;
494 }
495
496 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
497 {
498         DECODE_HEAD;
499
500         READ_BUF(4);
501         READ32(bc->bc_cb_program);
502         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
503
504         DECODE_TAIL;
505 }
506
507 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
508 {
509         DECODE_HEAD;
510
511         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
512         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
513         READ32(bcts->dir);
514         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
515          * could help us figure out we should be using it. */
516         DECODE_TAIL;
517 }
518
519 static __be32
520 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
521 {
522         DECODE_HEAD;
523
524         READ_BUF(4);
525         READ32(close->cl_seqid);
526         return nfsd4_decode_stateid(argp, &close->cl_stateid);
527
528         DECODE_TAIL;
529 }
530
531
532 static __be32
533 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
534 {
535         DECODE_HEAD;
536
537         READ_BUF(12);
538         READ64(commit->co_offset);
539         READ32(commit->co_count);
540
541         DECODE_TAIL;
542 }
543
544 static __be32
545 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
546 {
547         DECODE_HEAD;
548
549         READ_BUF(4);
550         READ32(create->cr_type);
551         switch (create->cr_type) {
552         case NF4LNK:
553                 READ_BUF(4);
554                 READ32(create->cr_linklen);
555                 READ_BUF(create->cr_linklen);
556                 SAVEMEM(create->cr_linkname, create->cr_linklen);
557                 break;
558         case NF4BLK:
559         case NF4CHR:
560                 READ_BUF(8);
561                 READ32(create->cr_specdata1);
562                 READ32(create->cr_specdata2);
563                 break;
564         case NF4SOCK:
565         case NF4FIFO:
566         case NF4DIR:
567         default:
568                 break;
569         }
570
571         READ_BUF(4);
572         READ32(create->cr_namelen);
573         READ_BUF(create->cr_namelen);
574         SAVEMEM(create->cr_name, create->cr_namelen);
575         if ((status = check_filename(create->cr_name, create->cr_namelen)))
576                 return status;
577
578         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
579                                     &create->cr_acl);
580         if (status)
581                 goto out;
582
583         DECODE_TAIL;
584 }
585
586 static inline __be32
587 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
588 {
589         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
590 }
591
592 static inline __be32
593 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
594 {
595         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
596 }
597
598 static __be32
599 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
600 {
601         DECODE_HEAD;
602
603         READ_BUF(4);
604         READ32(link->li_namelen);
605         READ_BUF(link->li_namelen);
606         SAVEMEM(link->li_name, link->li_namelen);
607         if ((status = check_filename(link->li_name, link->li_namelen)))
608                 return status;
609
610         DECODE_TAIL;
611 }
612
613 static __be32
614 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
615 {
616         DECODE_HEAD;
617
618         /*
619         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
620         */
621         READ_BUF(28);
622         READ32(lock->lk_type);
623         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
624                 goto xdr_error;
625         READ32(lock->lk_reclaim);
626         READ64(lock->lk_offset);
627         READ64(lock->lk_length);
628         READ32(lock->lk_is_new);
629
630         if (lock->lk_is_new) {
631                 READ_BUF(4);
632                 READ32(lock->lk_new_open_seqid);
633                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
634                 if (status)
635                         return status;
636                 READ_BUF(8 + sizeof(clientid_t));
637                 READ32(lock->lk_new_lock_seqid);
638                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
639                 READ32(lock->lk_new_owner.len);
640                 READ_BUF(lock->lk_new_owner.len);
641                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
642         } else {
643                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
644                 if (status)
645                         return status;
646                 READ_BUF(4);
647                 READ32(lock->lk_old_lock_seqid);
648         }
649
650         DECODE_TAIL;
651 }
652
653 static __be32
654 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
655 {
656         DECODE_HEAD;
657                         
658         READ_BUF(32);
659         READ32(lockt->lt_type);
660         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
661                 goto xdr_error;
662         READ64(lockt->lt_offset);
663         READ64(lockt->lt_length);
664         COPYMEM(&lockt->lt_clientid, 8);
665         READ32(lockt->lt_owner.len);
666         READ_BUF(lockt->lt_owner.len);
667         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
668
669         DECODE_TAIL;
670 }
671
672 static __be32
673 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
674 {
675         DECODE_HEAD;
676
677         READ_BUF(8);
678         READ32(locku->lu_type);
679         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
680                 goto xdr_error;
681         READ32(locku->lu_seqid);
682         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
683         if (status)
684                 return status;
685         READ_BUF(16);
686         READ64(locku->lu_offset);
687         READ64(locku->lu_length);
688
689         DECODE_TAIL;
690 }
691
692 static __be32
693 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
694 {
695         DECODE_HEAD;
696
697         READ_BUF(4);
698         READ32(lookup->lo_len);
699         READ_BUF(lookup->lo_len);
700         SAVEMEM(lookup->lo_name, lookup->lo_len);
701         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
702                 return status;
703
704         DECODE_TAIL;
705 }
706
707 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
708 {
709         __be32 *p;
710         u32 w;
711
712         READ_BUF(4);
713         READ32(w);
714         *share_access = w & NFS4_SHARE_ACCESS_MASK;
715         *deleg_want = w & NFS4_SHARE_WANT_MASK;
716         if (deleg_when)
717                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
718
719         switch (w & NFS4_SHARE_ACCESS_MASK) {
720         case NFS4_SHARE_ACCESS_READ:
721         case NFS4_SHARE_ACCESS_WRITE:
722         case NFS4_SHARE_ACCESS_BOTH:
723                 break;
724         default:
725                 return nfserr_bad_xdr;
726         }
727         w &= ~NFS4_SHARE_ACCESS_MASK;
728         if (!w)
729                 return nfs_ok;
730         if (!argp->minorversion)
731                 return nfserr_bad_xdr;
732         switch (w & NFS4_SHARE_WANT_MASK) {
733         case NFS4_SHARE_WANT_NO_PREFERENCE:
734         case NFS4_SHARE_WANT_READ_DELEG:
735         case NFS4_SHARE_WANT_WRITE_DELEG:
736         case NFS4_SHARE_WANT_ANY_DELEG:
737         case NFS4_SHARE_WANT_NO_DELEG:
738         case NFS4_SHARE_WANT_CANCEL:
739                 break;
740         default:
741                 return nfserr_bad_xdr;
742         }
743         w &= ~NFS4_SHARE_WANT_MASK;
744         if (!w)
745                 return nfs_ok;
746
747         if (!deleg_when)        /* open_downgrade */
748                 return nfserr_inval;
749         switch (w) {
750         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
751         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
752         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
753               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
754                 return nfs_ok;
755         }
756 xdr_error:
757         return nfserr_bad_xdr;
758 }
759
760 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
761 {
762         __be32 *p;
763
764         READ_BUF(4);
765         READ32(*x);
766         /* Note: unlinke access bits, deny bits may be zero. */
767         if (*x & ~NFS4_SHARE_DENY_BOTH)
768                 return nfserr_bad_xdr;
769         return nfs_ok;
770 xdr_error:
771         return nfserr_bad_xdr;
772 }
773
774 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
775 {
776         __be32 *p;
777
778         READ_BUF(4);
779         READ32(o->len);
780
781         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
782                 return nfserr_bad_xdr;
783
784         READ_BUF(o->len);
785         SAVEMEM(o->data, o->len);
786         return nfs_ok;
787 xdr_error:
788         return nfserr_bad_xdr;
789 }
790
791 static __be32
792 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
793 {
794         DECODE_HEAD;
795         u32 dummy;
796
797         memset(open->op_bmval, 0, sizeof(open->op_bmval));
798         open->op_iattr.ia_valid = 0;
799         open->op_openowner = NULL;
800
801         open->op_xdr_error = 0;
802         /* seqid, share_access, share_deny, clientid, ownerlen */
803         READ_BUF(4);
804         READ32(open->op_seqid);
805         /* decode, yet ignore deleg_when until supported */
806         status = nfsd4_decode_share_access(argp, &open->op_share_access,
807                                            &open->op_deleg_want, &dummy);
808         if (status)
809                 goto xdr_error;
810         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
811         if (status)
812                 goto xdr_error;
813         READ_BUF(sizeof(clientid_t));
814         COPYMEM(&open->op_clientid, sizeof(clientid_t));
815         status = nfsd4_decode_opaque(argp, &open->op_owner);
816         if (status)
817                 goto xdr_error;
818         READ_BUF(4);
819         READ32(open->op_create);
820         switch (open->op_create) {
821         case NFS4_OPEN_NOCREATE:
822                 break;
823         case NFS4_OPEN_CREATE:
824                 READ_BUF(4);
825                 READ32(open->op_createmode);
826                 switch (open->op_createmode) {
827                 case NFS4_CREATE_UNCHECKED:
828                 case NFS4_CREATE_GUARDED:
829                         status = nfsd4_decode_fattr(argp, open->op_bmval,
830                                 &open->op_iattr, &open->op_acl);
831                         if (status)
832                                 goto out;
833                         break;
834                 case NFS4_CREATE_EXCLUSIVE:
835                         READ_BUF(NFS4_VERIFIER_SIZE);
836                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
837                         break;
838                 case NFS4_CREATE_EXCLUSIVE4_1:
839                         if (argp->minorversion < 1)
840                                 goto xdr_error;
841                         READ_BUF(NFS4_VERIFIER_SIZE);
842                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
843                         status = nfsd4_decode_fattr(argp, open->op_bmval,
844                                 &open->op_iattr, &open->op_acl);
845                         if (status)
846                                 goto out;
847                         break;
848                 default:
849                         goto xdr_error;
850                 }
851                 break;
852         default:
853                 goto xdr_error;
854         }
855
856         /* open_claim */
857         READ_BUF(4);
858         READ32(open->op_claim_type);
859         switch (open->op_claim_type) {
860         case NFS4_OPEN_CLAIM_NULL:
861         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
862                 READ_BUF(4);
863                 READ32(open->op_fname.len);
864                 READ_BUF(open->op_fname.len);
865                 SAVEMEM(open->op_fname.data, open->op_fname.len);
866                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
867                         return status;
868                 break;
869         case NFS4_OPEN_CLAIM_PREVIOUS:
870                 READ_BUF(4);
871                 READ32(open->op_delegate_type);
872                 break;
873         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
874                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
875                 if (status)
876                         return status;
877                 READ_BUF(4);
878                 READ32(open->op_fname.len);
879                 READ_BUF(open->op_fname.len);
880                 SAVEMEM(open->op_fname.data, open->op_fname.len);
881                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
882                         return status;
883                 break;
884         case NFS4_OPEN_CLAIM_FH:
885         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
886                 if (argp->minorversion < 1)
887                         goto xdr_error;
888                 /* void */
889                 break;
890         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
891                 if (argp->minorversion < 1)
892                         goto xdr_error;
893                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
894                 if (status)
895                         return status;
896                 break;
897         default:
898                 goto xdr_error;
899         }
900
901         DECODE_TAIL;
902 }
903
904 static __be32
905 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
906 {
907         DECODE_HEAD;
908                     
909         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
910         if (status)
911                 return status;
912         READ_BUF(4);
913         READ32(open_conf->oc_seqid);
914                                                         
915         DECODE_TAIL;
916 }
917
918 static __be32
919 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
920 {
921         DECODE_HEAD;
922                     
923         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
924         if (status)
925                 return status;
926         READ_BUF(4);
927         READ32(open_down->od_seqid);
928         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
929                                            &open_down->od_deleg_want, NULL);
930         if (status)
931                 return status;
932         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
933         if (status)
934                 return status;
935         DECODE_TAIL;
936 }
937
938 static __be32
939 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
940 {
941         DECODE_HEAD;
942
943         READ_BUF(4);
944         READ32(putfh->pf_fhlen);
945         if (putfh->pf_fhlen > NFS4_FHSIZE)
946                 goto xdr_error;
947         READ_BUF(putfh->pf_fhlen);
948         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
949
950         DECODE_TAIL;
951 }
952
953 static __be32
954 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
955 {
956         DECODE_HEAD;
957
958         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
959         if (status)
960                 return status;
961         READ_BUF(12);
962         READ64(read->rd_offset);
963         READ32(read->rd_length);
964
965         DECODE_TAIL;
966 }
967
968 static __be32
969 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
970 {
971         DECODE_HEAD;
972
973         READ_BUF(24);
974         READ64(readdir->rd_cookie);
975         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
976         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
977         READ32(readdir->rd_maxcount);
978         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
979                 goto out;
980
981         DECODE_TAIL;
982 }
983
984 static __be32
985 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
986 {
987         DECODE_HEAD;
988
989         READ_BUF(4);
990         READ32(remove->rm_namelen);
991         READ_BUF(remove->rm_namelen);
992         SAVEMEM(remove->rm_name, remove->rm_namelen);
993         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
994                 return status;
995
996         DECODE_TAIL;
997 }
998
999 static __be32
1000 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1001 {
1002         DECODE_HEAD;
1003
1004         READ_BUF(4);
1005         READ32(rename->rn_snamelen);
1006         READ_BUF(rename->rn_snamelen + 4);
1007         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1008         READ32(rename->rn_tnamelen);
1009         READ_BUF(rename->rn_tnamelen);
1010         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1011         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1012                 return status;
1013         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1014                 return status;
1015
1016         DECODE_TAIL;
1017 }
1018
1019 static __be32
1020 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1021 {
1022         DECODE_HEAD;
1023
1024         READ_BUF(sizeof(clientid_t));
1025         COPYMEM(clientid, sizeof(clientid_t));
1026
1027         DECODE_TAIL;
1028 }
1029
1030 static __be32
1031 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1032                      struct nfsd4_secinfo *secinfo)
1033 {
1034         DECODE_HEAD;
1035
1036         READ_BUF(4);
1037         READ32(secinfo->si_namelen);
1038         READ_BUF(secinfo->si_namelen);
1039         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1040         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1041         if (status)
1042                 return status;
1043         DECODE_TAIL;
1044 }
1045
1046 static __be32
1047 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1048                      struct nfsd4_secinfo_no_name *sin)
1049 {
1050         DECODE_HEAD;
1051
1052         READ_BUF(4);
1053         READ32(sin->sin_style);
1054         DECODE_TAIL;
1055 }
1056
1057 static __be32
1058 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1059 {
1060         __be32 status;
1061
1062         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1063         if (status)
1064                 return status;
1065         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1066                                   &setattr->sa_acl);
1067 }
1068
1069 static __be32
1070 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1071 {
1072         DECODE_HEAD;
1073
1074         READ_BUF(NFS4_VERIFIER_SIZE);
1075         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1076
1077         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1078         if (status)
1079                 return nfserr_bad_xdr;
1080         READ_BUF(8);
1081         READ32(setclientid->se_callback_prog);
1082         READ32(setclientid->se_callback_netid_len);
1083
1084         READ_BUF(setclientid->se_callback_netid_len + 4);
1085         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1086         READ32(setclientid->se_callback_addr_len);
1087
1088         READ_BUF(setclientid->se_callback_addr_len + 4);
1089         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1090         READ32(setclientid->se_callback_ident);
1091
1092         DECODE_TAIL;
1093 }
1094
1095 static __be32
1096 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1097 {
1098         DECODE_HEAD;
1099
1100         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1101         COPYMEM(&scd_c->sc_clientid, 8);
1102         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1103
1104         DECODE_TAIL;
1105 }
1106
1107 /* Also used for NVERIFY */
1108 static __be32
1109 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1110 {
1111         DECODE_HEAD;
1112
1113         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1114                 goto out;
1115
1116         /* For convenience's sake, we compare raw xdr'd attributes in
1117          * nfsd4_proc_verify */
1118
1119         READ_BUF(4);
1120         READ32(verify->ve_attrlen);
1121         READ_BUF(verify->ve_attrlen);
1122         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1123
1124         DECODE_TAIL;
1125 }
1126
1127 static __be32
1128 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1129 {
1130         int avail;
1131         int len;
1132         DECODE_HEAD;
1133
1134         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1135         if (status)
1136                 return status;
1137         READ_BUF(16);
1138         READ64(write->wr_offset);
1139         READ32(write->wr_stable_how);
1140         if (write->wr_stable_how > 2)
1141                 goto xdr_error;
1142         READ32(write->wr_buflen);
1143
1144         /* Sorry .. no magic macros for this.. *
1145          * READ_BUF(write->wr_buflen);
1146          * SAVEMEM(write->wr_buf, write->wr_buflen);
1147          */
1148         avail = (char*)argp->end - (char*)argp->p;
1149         if (avail + argp->pagelen < write->wr_buflen) {
1150                 dprintk("NFSD: xdr error (%s:%d)\n",
1151                                 __FILE__, __LINE__);
1152                 goto xdr_error;
1153         }
1154         write->wr_head.iov_base = p;
1155         write->wr_head.iov_len = avail;
1156         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1157         write->wr_pagelist = argp->pagelist;
1158
1159         len = XDR_QUADLEN(write->wr_buflen) << 2;
1160         if (len >= avail) {
1161                 int pages;
1162
1163                 len -= avail;
1164
1165                 pages = len >> PAGE_SHIFT;
1166                 argp->pagelist += pages;
1167                 argp->pagelen -= pages * PAGE_SIZE;
1168                 len -= pages * PAGE_SIZE;
1169
1170                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1171                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1172         }
1173         argp->p += XDR_QUADLEN(len);
1174
1175         DECODE_TAIL;
1176 }
1177
1178 static __be32
1179 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1180 {
1181         DECODE_HEAD;
1182
1183         READ_BUF(12);
1184         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1185         READ32(rlockowner->rl_owner.len);
1186         READ_BUF(rlockowner->rl_owner.len);
1187         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1188
1189         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1190                 return nfserr_inval;
1191         DECODE_TAIL;
1192 }
1193
1194 static __be32
1195 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1196                          struct nfsd4_exchange_id *exid)
1197 {
1198         int dummy, tmp;
1199         DECODE_HEAD;
1200
1201         READ_BUF(NFS4_VERIFIER_SIZE);
1202         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1203
1204         status = nfsd4_decode_opaque(argp, &exid->clname);
1205         if (status)
1206                 return nfserr_bad_xdr;
1207
1208         READ_BUF(4);
1209         READ32(exid->flags);
1210
1211         /* Ignore state_protect4_a */
1212         READ_BUF(4);
1213         READ32(exid->spa_how);
1214         switch (exid->spa_how) {
1215         case SP4_NONE:
1216                 break;
1217         case SP4_MACH_CRED:
1218                 /* spo_must_enforce */
1219                 READ_BUF(4);
1220                 READ32(dummy);
1221                 READ_BUF(dummy * 4);
1222                 p += dummy;
1223
1224                 /* spo_must_allow */
1225                 READ_BUF(4);
1226                 READ32(dummy);
1227                 READ_BUF(dummy * 4);
1228                 p += dummy;
1229                 break;
1230         case SP4_SSV:
1231                 /* ssp_ops */
1232                 READ_BUF(4);
1233                 READ32(dummy);
1234                 READ_BUF(dummy * 4);
1235                 p += dummy;
1236
1237                 READ_BUF(4);
1238                 READ32(dummy);
1239                 READ_BUF(dummy * 4);
1240                 p += dummy;
1241
1242                 /* ssp_hash_algs<> */
1243                 READ_BUF(4);
1244                 READ32(tmp);
1245                 while (tmp--) {
1246                         READ_BUF(4);
1247                         READ32(dummy);
1248                         READ_BUF(dummy);
1249                         p += XDR_QUADLEN(dummy);
1250                 }
1251
1252                 /* ssp_encr_algs<> */
1253                 READ_BUF(4);
1254                 READ32(tmp);
1255                 while (tmp--) {
1256                         READ_BUF(4);
1257                         READ32(dummy);
1258                         READ_BUF(dummy);
1259                         p += XDR_QUADLEN(dummy);
1260                 }
1261
1262                 /* ssp_window and ssp_num_gss_handles */
1263                 READ_BUF(8);
1264                 READ32(dummy);
1265                 READ32(dummy);
1266                 break;
1267         default:
1268                 goto xdr_error;
1269         }
1270
1271         /* Ignore Implementation ID */
1272         READ_BUF(4);    /* nfs_impl_id4 array length */
1273         READ32(dummy);
1274
1275         if (dummy > 1)
1276                 goto xdr_error;
1277
1278         if (dummy == 1) {
1279                 /* nii_domain */
1280                 READ_BUF(4);
1281                 READ32(dummy);
1282                 READ_BUF(dummy);
1283                 p += XDR_QUADLEN(dummy);
1284
1285                 /* nii_name */
1286                 READ_BUF(4);
1287                 READ32(dummy);
1288                 READ_BUF(dummy);
1289                 p += XDR_QUADLEN(dummy);
1290
1291                 /* nii_date */
1292                 READ_BUF(12);
1293                 p += 3;
1294         }
1295         DECODE_TAIL;
1296 }
1297
1298 static __be32
1299 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1300                             struct nfsd4_create_session *sess)
1301 {
1302         DECODE_HEAD;
1303         u32 dummy;
1304
1305         READ_BUF(16);
1306         COPYMEM(&sess->clientid, 8);
1307         READ32(sess->seqid);
1308         READ32(sess->flags);
1309
1310         /* Fore channel attrs */
1311         READ_BUF(28);
1312         READ32(dummy); /* headerpadsz is always 0 */
1313         READ32(sess->fore_channel.maxreq_sz);
1314         READ32(sess->fore_channel.maxresp_sz);
1315         READ32(sess->fore_channel.maxresp_cached);
1316         READ32(sess->fore_channel.maxops);
1317         READ32(sess->fore_channel.maxreqs);
1318         READ32(sess->fore_channel.nr_rdma_attrs);
1319         if (sess->fore_channel.nr_rdma_attrs == 1) {
1320                 READ_BUF(4);
1321                 READ32(sess->fore_channel.rdma_attrs);
1322         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1323                 dprintk("Too many fore channel attr bitmaps!\n");
1324                 goto xdr_error;
1325         }
1326
1327         /* Back channel attrs */
1328         READ_BUF(28);
1329         READ32(dummy); /* headerpadsz is always 0 */
1330         READ32(sess->back_channel.maxreq_sz);
1331         READ32(sess->back_channel.maxresp_sz);
1332         READ32(sess->back_channel.maxresp_cached);
1333         READ32(sess->back_channel.maxops);
1334         READ32(sess->back_channel.maxreqs);
1335         READ32(sess->back_channel.nr_rdma_attrs);
1336         if (sess->back_channel.nr_rdma_attrs == 1) {
1337                 READ_BUF(4);
1338                 READ32(sess->back_channel.rdma_attrs);
1339         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1340                 dprintk("Too many back channel attr bitmaps!\n");
1341                 goto xdr_error;
1342         }
1343
1344         READ_BUF(4);
1345         READ32(sess->callback_prog);
1346         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1347         DECODE_TAIL;
1348 }
1349
1350 static __be32
1351 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1352                              struct nfsd4_destroy_session *destroy_session)
1353 {
1354         DECODE_HEAD;
1355         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1356         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1357
1358         DECODE_TAIL;
1359 }
1360
1361 static __be32
1362 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1363                           struct nfsd4_free_stateid *free_stateid)
1364 {
1365         DECODE_HEAD;
1366
1367         READ_BUF(sizeof(stateid_t));
1368         READ32(free_stateid->fr_stateid.si_generation);
1369         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1370
1371         DECODE_TAIL;
1372 }
1373
1374 static __be32
1375 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1376                       struct nfsd4_sequence *seq)
1377 {
1378         DECODE_HEAD;
1379
1380         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1381         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1382         READ32(seq->seqid);
1383         READ32(seq->slotid);
1384         READ32(seq->maxslots);
1385         READ32(seq->cachethis);
1386
1387         DECODE_TAIL;
1388 }
1389
1390 static __be32
1391 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1392 {
1393         int i;
1394         __be32 *p, status;
1395         struct nfsd4_test_stateid_id *stateid;
1396
1397         READ_BUF(4);
1398         test_stateid->ts_num_ids = ntohl(*p++);
1399
1400         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1401
1402         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1403                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1404                 if (!stateid) {
1405                         status = nfserrno(-ENOMEM);
1406                         goto out;
1407                 }
1408
1409                 defer_free(argp, kfree, stateid);
1410                 INIT_LIST_HEAD(&stateid->ts_id_list);
1411                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1412
1413                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1414                 if (status)
1415                         goto out;
1416         }
1417
1418         status = 0;
1419 out:
1420         return status;
1421 xdr_error:
1422         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1423         status = nfserr_bad_xdr;
1424         goto out;
1425 }
1426
1427 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1428 {
1429         DECODE_HEAD;
1430
1431         READ_BUF(8);
1432         COPYMEM(&dc->clientid, 8);
1433
1434         DECODE_TAIL;
1435 }
1436
1437 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1438 {
1439         DECODE_HEAD;
1440
1441         READ_BUF(4);
1442         READ32(rc->rca_one_fs);
1443
1444         DECODE_TAIL;
1445 }
1446
1447 static __be32
1448 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1449 {
1450         return nfs_ok;
1451 }
1452
1453 static __be32
1454 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1455 {
1456         return nfserr_notsupp;
1457 }
1458
1459 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1460
1461 static nfsd4_dec nfsd4_dec_ops[] = {
1462         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1463         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1464         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1465         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1466         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1467         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1468         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1469         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1470         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1471         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1472         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1473         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1474         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1475         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1476         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1477         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1478         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1479         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1480         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1481         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1482         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1483         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1484         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1485         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1486         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1487         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1488         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1489         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1490         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1491         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1492         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1493         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1494         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1495         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1496         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1497         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1498         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1499 };
1500
1501 static nfsd4_dec nfsd41_dec_ops[] = {
1502         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1503         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1504         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1505         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1506         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1507         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1508         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1509         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1510         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1511         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1512         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1513         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1514         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1515         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1516         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1517         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1518         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1519         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1520         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1521         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1522         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1523         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1524         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1525         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1526         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1527         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1528         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1529         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1530         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1531         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1532         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1533         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1534         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1535         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1536         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1537         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1538         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1539
1540         /* new operations for NFSv4.1 */
1541         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1542         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1543         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1544         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1545         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1546         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1547         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1548         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1549         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1550         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1551         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1552         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1553         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1554         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1555         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1556         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1557         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1558         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1559         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1560 };
1561
1562 struct nfsd4_minorversion_ops {
1563         nfsd4_dec *decoders;
1564         int nops;
1565 };
1566
1567 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1568         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1569         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1570 };
1571
1572 static __be32
1573 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1574 {
1575         DECODE_HEAD;
1576         struct nfsd4_op *op;
1577         struct nfsd4_minorversion_ops *ops;
1578         bool cachethis = false;
1579         int i;
1580
1581         READ_BUF(4);
1582         READ32(argp->taglen);
1583         READ_BUF(argp->taglen + 8);
1584         SAVEMEM(argp->tag, argp->taglen);
1585         READ32(argp->minorversion);
1586         READ32(argp->opcnt);
1587
1588         if (argp->taglen > NFSD4_MAX_TAGLEN)
1589                 goto xdr_error;
1590         if (argp->opcnt > 100)
1591                 goto xdr_error;
1592
1593         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1594                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1595                 if (!argp->ops) {
1596                         argp->ops = argp->iops;
1597                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1598                         goto xdr_error;
1599                 }
1600         }
1601
1602         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1603                 argp->opcnt = 0;
1604
1605         ops = &nfsd4_minorversion[argp->minorversion];
1606         for (i = 0; i < argp->opcnt; i++) {
1607                 op = &argp->ops[i];
1608                 op->replay = NULL;
1609
1610                 READ_BUF(4);
1611                 READ32(op->opnum);
1612
1613                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1614                         op->status = ops->decoders[op->opnum](argp, &op->u);
1615                 else {
1616                         op->opnum = OP_ILLEGAL;
1617                         op->status = nfserr_op_illegal;
1618                 }
1619
1620                 if (op->status) {
1621                         argp->opcnt = i+1;
1622                         break;
1623                 }
1624                 /*
1625                  * We'll try to cache the result in the DRC if any one
1626                  * op in the compound wants to be cached:
1627                  */
1628                 cachethis |= nfsd4_cache_this_op(op);
1629         }
1630         /* Sessions make the DRC unnecessary: */
1631         if (argp->minorversion)
1632                 cachethis = false;
1633         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1634
1635         DECODE_TAIL;
1636 }
1637
1638 #define WRITE32(n)               *p++ = htonl(n)
1639 #define WRITE64(n)               do {                           \
1640         *p++ = htonl((u32)((n) >> 32));                         \
1641         *p++ = htonl((u32)(n));                                 \
1642 } while (0)
1643 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1644         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1645         memcpy(p, ptr, nbytes);                                 \
1646         p += XDR_QUADLEN(nbytes);                               \
1647 }} while (0)
1648
1649 static void write32(__be32 **p, u32 n)
1650 {
1651         *(*p)++ = htonl(n);
1652 }
1653
1654 static void write64(__be32 **p, u64 n)
1655 {
1656         write32(p, (n >> 32));
1657         write32(p, (u32)n);
1658 }
1659
1660 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1661 {
1662         if (IS_I_VERSION(inode)) {
1663                 write64(p, inode->i_version);
1664         } else {
1665                 write32(p, stat->ctime.tv_sec);
1666                 write32(p, stat->ctime.tv_nsec);
1667         }
1668 }
1669
1670 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1671 {
1672         write32(p, c->atomic);
1673         if (c->change_supported) {
1674                 write64(p, c->before_change);
1675                 write64(p, c->after_change);
1676         } else {
1677                 write32(p, c->before_ctime_sec);
1678                 write32(p, c->before_ctime_nsec);
1679                 write32(p, c->after_ctime_sec);
1680                 write32(p, c->after_ctime_nsec);
1681         }
1682 }
1683
1684 #define RESERVE_SPACE(nbytes)   do {                            \
1685         p = resp->p;                                            \
1686         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1687 } while (0)
1688 #define ADJUST_ARGS()           resp->p = p
1689
1690 /* Encode as an array of strings the string given with components
1691  * separated @sep, escaped with esc_enter and esc_exit.
1692  */
1693 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1694                                    __be32 **pp, int *buflen,
1695                                    char esc_enter, char esc_exit)
1696 {
1697         __be32 *p = *pp;
1698         __be32 *countp = p;
1699         int strlen, count=0;
1700         char *str, *end, *next;
1701
1702         dprintk("nfsd4_encode_components(%s)\n", components);
1703         if ((*buflen -= 4) < 0)
1704                 return nfserr_resource;
1705         WRITE32(0); /* We will fill this in with @count later */
1706         end = str = components;
1707         while (*end) {
1708                 bool found_esc = false;
1709
1710                 /* try to parse as esc_start, ..., esc_end, sep */
1711                 if (*str == esc_enter) {
1712                         for (; *end && (*end != esc_exit); end++)
1713                                 /* find esc_exit or end of string */;
1714                         next = end + 1;
1715                         if (*end && (!*next || *next == sep)) {
1716                                 str++;
1717                                 found_esc = true;
1718                         }
1719                 }
1720
1721                 if (!found_esc)
1722                         for (; *end && (*end != sep); end++)
1723                                 /* find sep or end of string */;
1724
1725                 strlen = end - str;
1726                 if (strlen) {
1727                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1728                                 return nfserr_resource;
1729                         WRITE32(strlen);
1730                         WRITEMEM(str, strlen);
1731                         count++;
1732                 }
1733                 else
1734                         end++;
1735                 str = end;
1736         }
1737         *pp = p;
1738         p = countp;
1739         WRITE32(count);
1740         return 0;
1741 }
1742
1743 /* Encode as an array of strings the string given with components
1744  * separated @sep.
1745  */
1746 static __be32 nfsd4_encode_components(char sep, char *components,
1747                                    __be32 **pp, int *buflen)
1748 {
1749         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1750 }
1751
1752 /*
1753  * encode a location element of a fs_locations structure
1754  */
1755 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1756                                     __be32 **pp, int *buflen)
1757 {
1758         __be32 status;
1759         __be32 *p = *pp;
1760
1761         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1762                                                 '[', ']');
1763         if (status)
1764                 return status;
1765         status = nfsd4_encode_components('/', location->path, &p, buflen);
1766         if (status)
1767                 return status;
1768         *pp = p;
1769         return 0;
1770 }
1771
1772 /*
1773  * Encode a path in RFC3530 'pathname4' format
1774  */
1775 static __be32 nfsd4_encode_path(const struct path *root,
1776                 const struct path *path, __be32 **pp, int *buflen)
1777 {
1778         struct path cur = {
1779                 .mnt = path->mnt,
1780                 .dentry = path->dentry,
1781         };
1782         __be32 *p = *pp;
1783         struct dentry **components = NULL;
1784         unsigned int ncomponents = 0;
1785         __be32 err = nfserr_jukebox;
1786
1787         dprintk("nfsd4_encode_components(");
1788
1789         path_get(&cur);
1790         /* First walk the path up to the nfsd root, and store the
1791          * dentries/path components in an array.
1792          */
1793         for (;;) {
1794                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1795                         break;
1796                 if (cur.dentry == cur.mnt->mnt_root) {
1797                         if (follow_up(&cur))
1798                                 continue;
1799                         goto out_free;
1800                 }
1801                 if ((ncomponents & 15) == 0) {
1802                         struct dentry **new;
1803                         new = krealloc(components,
1804                                         sizeof(*new) * (ncomponents + 16),
1805                                         GFP_KERNEL);
1806                         if (!new)
1807                                 goto out_free;
1808                         components = new;
1809                 }
1810                 components[ncomponents++] = cur.dentry;
1811                 cur.dentry = dget_parent(cur.dentry);
1812         }
1813
1814         *buflen -= 4;
1815         if (*buflen < 0)
1816                 goto out_free;
1817         WRITE32(ncomponents);
1818
1819         while (ncomponents) {
1820                 struct dentry *dentry = components[ncomponents - 1];
1821                 unsigned int len = dentry->d_name.len;
1822
1823                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1824                 if (*buflen < 0)
1825                         goto out_free;
1826                 WRITE32(len);
1827                 WRITEMEM(dentry->d_name.name, len);
1828                 dprintk("/%s", dentry->d_name.name);
1829                 dput(dentry);
1830                 ncomponents--;
1831         }
1832
1833         *pp = p;
1834         err = 0;
1835 out_free:
1836         dprintk(")\n");
1837         while (ncomponents)
1838                 dput(components[--ncomponents]);
1839         kfree(components);
1840         path_put(&cur);
1841         return err;
1842 }
1843
1844 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1845                 const struct path *path, __be32 **pp, int *buflen)
1846 {
1847         struct svc_export *exp_ps;
1848         __be32 res;
1849
1850         exp_ps = rqst_find_fsidzero_export(rqstp);
1851         if (IS_ERR(exp_ps))
1852                 return nfserrno(PTR_ERR(exp_ps));
1853         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1854         exp_put(exp_ps);
1855         return res;
1856 }
1857
1858 /*
1859  *  encode a fs_locations structure
1860  */
1861 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1862                                      struct svc_export *exp,
1863                                      __be32 **pp, int *buflen)
1864 {
1865         __be32 status;
1866         int i;
1867         __be32 *p = *pp;
1868         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1869
1870         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1871         if (status)
1872                 return status;
1873         if ((*buflen -= 4) < 0)
1874                 return nfserr_resource;
1875         WRITE32(fslocs->locations_count);
1876         for (i=0; i<fslocs->locations_count; i++) {
1877                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1878                                                    &p, buflen);
1879                 if (status)
1880                         return status;
1881         }
1882         *pp = p;
1883         return 0;
1884 }
1885
1886 static u32 nfs4_file_type(umode_t mode)
1887 {
1888         switch (mode & S_IFMT) {
1889         case S_IFIFO:   return NF4FIFO;
1890         case S_IFCHR:   return NF4CHR;
1891         case S_IFDIR:   return NF4DIR;
1892         case S_IFBLK:   return NF4BLK;
1893         case S_IFLNK:   return NF4LNK;
1894         case S_IFREG:   return NF4REG;
1895         case S_IFSOCK:  return NF4SOCK;
1896         default:        return NF4BAD;
1897         };
1898 }
1899
1900 static __be32
1901 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1902                         __be32 **p, int *buflen)
1903 {
1904         int status;
1905
1906         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1907                 return nfserr_resource;
1908         if (whotype != NFS4_ACL_WHO_NAMED)
1909                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1910         else if (gid_valid(gid))
1911                 status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1912         else
1913                 status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1914         if (status < 0)
1915                 return nfserrno(status);
1916         *p = xdr_encode_opaque(*p, NULL, status);
1917         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1918         BUG_ON(*buflen < 0);
1919         return 0;
1920 }
1921
1922 static inline __be32
1923 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1924 {
1925         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1926                                  p, buflen);
1927 }
1928
1929 static inline __be32
1930 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1931 {
1932         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
1933                                  p, buflen);
1934 }
1935
1936 static inline __be32
1937 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1938                 __be32 **p, int *buflen)
1939 {
1940         kuid_t uid = INVALID_UID;
1941         kgid_t gid = INVALID_GID;
1942
1943         if (ace->whotype == NFS4_ACL_WHO_NAMED) {
1944                 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1945                         gid = ace->who_gid;
1946                 else
1947                         uid = ace->who_uid;
1948         }
1949         return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
1950 }
1951
1952 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1953                               FATTR4_WORD0_RDATTR_ERROR)
1954 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1955
1956 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1957 {
1958         /* As per referral draft:  */
1959         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1960             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1961                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1962                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1963                         *rdattr_err = NFSERR_MOVED;
1964                 else
1965                         return nfserr_moved;
1966         }
1967         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1968         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1969         return 0;
1970 }
1971
1972
1973 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1974 {
1975         struct path path = exp->ex_path;
1976         int err;
1977
1978         path_get(&path);
1979         while (follow_up(&path)) {
1980                 if (path.dentry != path.mnt->mnt_root)
1981                         break;
1982         }
1983         err = vfs_getattr(&path, stat);
1984         path_put(&path);
1985         return err;
1986 }
1987
1988 /*
1989  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1990  * ourselves.
1991  *
1992  * countp is the buffer size in _words_
1993  */
1994 __be32
1995 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1996                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
1997                 struct svc_rqst *rqstp, int ignore_crossmnt)
1998 {
1999         u32 bmval0 = bmval[0];
2000         u32 bmval1 = bmval[1];
2001         u32 bmval2 = bmval[2];
2002         struct kstat stat;
2003         struct svc_fh tempfh;
2004         struct kstatfs statfs;
2005         int buflen = count << 2;
2006         __be32 *attrlenp;
2007         u32 dummy;
2008         u64 dummy64;
2009         u32 rdattr_err = 0;
2010         __be32 *p = *buffer;
2011         __be32 status;
2012         int err;
2013         int aclsupport = 0;
2014         struct nfs4_acl *acl = NULL;
2015         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2016         u32 minorversion = resp->cstate.minorversion;
2017         struct path path = {
2018                 .mnt    = exp->ex_path.mnt,
2019                 .dentry = dentry,
2020         };
2021         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2022
2023         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2024         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2025         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2026         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2027
2028         if (exp->ex_fslocs.migrated) {
2029                 BUG_ON(bmval[2]);
2030                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2031                 if (status)
2032                         goto out;
2033         }
2034
2035         err = vfs_getattr(&path, &stat);
2036         if (err)
2037                 goto out_nfserr;
2038         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2039                         FATTR4_WORD0_MAXNAME)) ||
2040             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2041                        FATTR4_WORD1_SPACE_TOTAL))) {
2042                 err = vfs_statfs(&path, &statfs);
2043                 if (err)
2044                         goto out_nfserr;
2045         }
2046         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2047                 fh_init(&tempfh, NFS4_FHSIZE);
2048                 status = fh_compose(&tempfh, exp, dentry, NULL);
2049                 if (status)
2050                         goto out;
2051                 fhp = &tempfh;
2052         }
2053         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2054                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2055                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2056                 aclsupport = (err == 0);
2057                 if (bmval0 & FATTR4_WORD0_ACL) {
2058                         if (err == -EOPNOTSUPP)
2059                                 bmval0 &= ~FATTR4_WORD0_ACL;
2060                         else if (err == -EINVAL) {
2061                                 status = nfserr_attrnotsupp;
2062                                 goto out;
2063                         } else if (err != 0)
2064                                 goto out_nfserr;
2065                 }
2066         }
2067
2068         if (bmval2) {
2069                 if ((buflen -= 16) < 0)
2070                         goto out_resource;
2071                 WRITE32(3);
2072                 WRITE32(bmval0);
2073                 WRITE32(bmval1);
2074                 WRITE32(bmval2);
2075         } else if (bmval1) {
2076                 if ((buflen -= 12) < 0)
2077                         goto out_resource;
2078                 WRITE32(2);
2079                 WRITE32(bmval0);
2080                 WRITE32(bmval1);
2081         } else {
2082                 if ((buflen -= 8) < 0)
2083                         goto out_resource;
2084                 WRITE32(1);
2085                 WRITE32(bmval0);
2086         }
2087         attrlenp = p++;                /* to be backfilled later */
2088
2089         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2090                 u32 word0 = nfsd_suppattrs0(minorversion);
2091                 u32 word1 = nfsd_suppattrs1(minorversion);
2092                 u32 word2 = nfsd_suppattrs2(minorversion);
2093
2094                 if (!aclsupport)
2095                         word0 &= ~FATTR4_WORD0_ACL;
2096                 if (!word2) {
2097                         if ((buflen -= 12) < 0)
2098                                 goto out_resource;
2099                         WRITE32(2);
2100                         WRITE32(word0);
2101                         WRITE32(word1);
2102                 } else {
2103                         if ((buflen -= 16) < 0)
2104                                 goto out_resource;
2105                         WRITE32(3);
2106                         WRITE32(word0);
2107                         WRITE32(word1);
2108                         WRITE32(word2);
2109                 }
2110         }
2111         if (bmval0 & FATTR4_WORD0_TYPE) {
2112                 if ((buflen -= 4) < 0)
2113                         goto out_resource;
2114                 dummy = nfs4_file_type(stat.mode);
2115                 if (dummy == NF4BAD)
2116                         goto out_serverfault;
2117                 WRITE32(dummy);
2118         }
2119         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2120                 if ((buflen -= 4) < 0)
2121                         goto out_resource;
2122                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2123                         WRITE32(NFS4_FH_PERSISTENT);
2124                 else
2125                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2126         }
2127         if (bmval0 & FATTR4_WORD0_CHANGE) {
2128                 if ((buflen -= 8) < 0)
2129                         goto out_resource;
2130                 write_change(&p, &stat, dentry->d_inode);
2131         }
2132         if (bmval0 & FATTR4_WORD0_SIZE) {
2133                 if ((buflen -= 8) < 0)
2134                         goto out_resource;
2135                 WRITE64(stat.size);
2136         }
2137         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2138                 if ((buflen -= 4) < 0)
2139                         goto out_resource;
2140                 WRITE32(1);
2141         }
2142         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2143                 if ((buflen -= 4) < 0)
2144                         goto out_resource;
2145                 WRITE32(1);
2146         }
2147         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2148                 if ((buflen -= 4) < 0)
2149                         goto out_resource;
2150                 WRITE32(0);
2151         }
2152         if (bmval0 & FATTR4_WORD0_FSID) {
2153                 if ((buflen -= 16) < 0)
2154                         goto out_resource;
2155                 if (exp->ex_fslocs.migrated) {
2156                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2157                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2158                 } else switch(fsid_source(fhp)) {
2159                 case FSIDSOURCE_FSID:
2160                         WRITE64((u64)exp->ex_fsid);
2161                         WRITE64((u64)0);
2162                         break;
2163                 case FSIDSOURCE_DEV:
2164                         WRITE32(0);
2165                         WRITE32(MAJOR(stat.dev));
2166                         WRITE32(0);
2167                         WRITE32(MINOR(stat.dev));
2168                         break;
2169                 case FSIDSOURCE_UUID:
2170                         WRITEMEM(exp->ex_uuid, 16);
2171                         break;
2172                 }
2173         }
2174         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2175                 if ((buflen -= 4) < 0)
2176                         goto out_resource;
2177                 WRITE32(0);
2178         }
2179         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2180                 if ((buflen -= 4) < 0)
2181                         goto out_resource;
2182                 WRITE32(nn->nfsd4_lease);
2183         }
2184         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2185                 if ((buflen -= 4) < 0)
2186                         goto out_resource;
2187                 WRITE32(rdattr_err);
2188         }
2189         if (bmval0 & FATTR4_WORD0_ACL) {
2190                 struct nfs4_ace *ace;
2191
2192                 if (acl == NULL) {
2193                         if ((buflen -= 4) < 0)
2194                                 goto out_resource;
2195
2196                         WRITE32(0);
2197                         goto out_acl;
2198                 }
2199                 if ((buflen -= 4) < 0)
2200                         goto out_resource;
2201                 WRITE32(acl->naces);
2202
2203                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2204                         if ((buflen -= 4*3) < 0)
2205                                 goto out_resource;
2206                         WRITE32(ace->type);
2207                         WRITE32(ace->flag);
2208                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2209                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2210                         if (status == nfserr_resource)
2211                                 goto out_resource;
2212                         if (status)
2213                                 goto out;
2214                 }
2215         }
2216 out_acl:
2217         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2218                 if ((buflen -= 4) < 0)
2219                         goto out_resource;
2220                 WRITE32(aclsupport ?
2221                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2222         }
2223         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2224                 if ((buflen -= 4) < 0)
2225                         goto out_resource;
2226                 WRITE32(1);
2227         }
2228         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2229                 if ((buflen -= 4) < 0)
2230                         goto out_resource;
2231                 WRITE32(0);
2232         }
2233         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2234                 if ((buflen -= 4) < 0)
2235                         goto out_resource;
2236                 WRITE32(1);
2237         }
2238         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2239                 if ((buflen -= 4) < 0)
2240                         goto out_resource;
2241                 WRITE32(1);
2242         }
2243         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2244                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2245                 if (buflen < 0)
2246                         goto out_resource;
2247                 WRITE32(fhp->fh_handle.fh_size);
2248                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2249         }
2250         if (bmval0 & FATTR4_WORD0_FILEID) {
2251                 if ((buflen -= 8) < 0)
2252                         goto out_resource;
2253                 WRITE64(stat.ino);
2254         }
2255         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2256                 if ((buflen -= 8) < 0)
2257                         goto out_resource;
2258                 WRITE64((u64) statfs.f_ffree);
2259         }
2260         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2261                 if ((buflen -= 8) < 0)
2262                         goto out_resource;
2263                 WRITE64((u64) statfs.f_ffree);
2264         }
2265         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2266                 if ((buflen -= 8) < 0)
2267                         goto out_resource;
2268                 WRITE64((u64) statfs.f_files);
2269         }
2270         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2271                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2272                 if (status == nfserr_resource)
2273                         goto out_resource;
2274                 if (status)
2275                         goto out;
2276         }
2277         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2278                 if ((buflen -= 4) < 0)
2279                         goto out_resource;
2280                 WRITE32(1);
2281         }
2282         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2283                 if ((buflen -= 8) < 0)
2284                         goto out_resource;
2285                 WRITE64(~(u64)0);
2286         }
2287         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2288                 if ((buflen -= 4) < 0)
2289                         goto out_resource;
2290                 WRITE32(255);
2291         }
2292         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2293                 if ((buflen -= 4) < 0)
2294                         goto out_resource;
2295                 WRITE32(statfs.f_namelen);
2296         }
2297         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2298                 if ((buflen -= 8) < 0)
2299                         goto out_resource;
2300                 WRITE64((u64) svc_max_payload(rqstp));
2301         }
2302         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2303                 if ((buflen -= 8) < 0)
2304                         goto out_resource;
2305                 WRITE64((u64) svc_max_payload(rqstp));
2306         }
2307         if (bmval1 & FATTR4_WORD1_MODE) {
2308                 if ((buflen -= 4) < 0)
2309                         goto out_resource;
2310                 WRITE32(stat.mode & S_IALLUGO);
2311         }
2312         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2313                 if ((buflen -= 4) < 0)
2314                         goto out_resource;
2315                 WRITE32(1);
2316         }
2317         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2318                 if ((buflen -= 4) < 0)
2319                         goto out_resource;
2320                 WRITE32(stat.nlink);
2321         }
2322         if (bmval1 & FATTR4_WORD1_OWNER) {
2323                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2324                 if (status == nfserr_resource)
2325                         goto out_resource;
2326                 if (status)
2327                         goto out;
2328         }
2329         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2330                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2331                 if (status == nfserr_resource)
2332                         goto out_resource;
2333                 if (status)
2334                         goto out;
2335         }
2336         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2337                 if ((buflen -= 8) < 0)
2338                         goto out_resource;
2339                 WRITE32((u32) MAJOR(stat.rdev));
2340                 WRITE32((u32) MINOR(stat.rdev));
2341         }
2342         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2343                 if ((buflen -= 8) < 0)
2344                         goto out_resource;
2345                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2346                 WRITE64(dummy64);
2347         }
2348         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2349                 if ((buflen -= 8) < 0)
2350                         goto out_resource;
2351                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2352                 WRITE64(dummy64);
2353         }
2354         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2355                 if ((buflen -= 8) < 0)
2356                         goto out_resource;
2357                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2358                 WRITE64(dummy64);
2359         }
2360         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2361                 if ((buflen -= 8) < 0)
2362                         goto out_resource;
2363                 dummy64 = (u64)stat.blocks << 9;
2364                 WRITE64(dummy64);
2365         }
2366         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2367                 if ((buflen -= 12) < 0)
2368                         goto out_resource;
2369                 WRITE64((s64)stat.atime.tv_sec);
2370                 WRITE32(stat.atime.tv_nsec);
2371         }
2372         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2373                 if ((buflen -= 12) < 0)
2374                         goto out_resource;
2375                 WRITE32(0);
2376                 WRITE32(1);
2377                 WRITE32(0);
2378         }
2379         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2380                 if ((buflen -= 12) < 0)
2381                         goto out_resource;
2382                 WRITE64((s64)stat.ctime.tv_sec);
2383                 WRITE32(stat.ctime.tv_nsec);
2384         }
2385         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2386                 if ((buflen -= 12) < 0)
2387                         goto out_resource;
2388                 WRITE64((s64)stat.mtime.tv_sec);
2389                 WRITE32(stat.mtime.tv_nsec);
2390         }
2391         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2392                 if ((buflen -= 8) < 0)
2393                         goto out_resource;
2394                 /*
2395                  * Get parent's attributes if not ignoring crossmount
2396                  * and this is the root of a cross-mounted filesystem.
2397                  */
2398                 if (ignore_crossmnt == 0 &&
2399                     dentry == exp->ex_path.mnt->mnt_root)
2400                         get_parent_attributes(exp, &stat);
2401                 WRITE64(stat.ino);
2402         }
2403         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2404                 WRITE32(3);
2405                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2406                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2407                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2408         }
2409
2410         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2411         *buffer = p;
2412         status = nfs_ok;
2413
2414 out:
2415         kfree(acl);
2416         if (fhp == &tempfh)
2417                 fh_put(&tempfh);
2418         return status;
2419 out_nfserr:
2420         status = nfserrno(err);
2421         goto out;
2422 out_resource:
2423         status = nfserr_resource;
2424         goto out;
2425 out_serverfault:
2426         status = nfserr_serverfault;
2427         goto out;
2428 }
2429
2430 static inline int attributes_need_mount(u32 *bmval)
2431 {
2432         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2433                 return 1;
2434         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2435                 return 1;
2436         return 0;
2437 }
2438
2439 static __be32
2440 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2441                 const char *name, int namlen, __be32 **p, int buflen)
2442 {
2443         struct svc_export *exp = cd->rd_fhp->fh_export;
2444         struct dentry *dentry;
2445         __be32 nfserr;
2446         int ignore_crossmnt = 0;
2447
2448         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2449         if (IS_ERR(dentry))
2450                 return nfserrno(PTR_ERR(dentry));
2451         if (!dentry->d_inode) {
2452                 /*
2453                  * nfsd_buffered_readdir drops the i_mutex between
2454                  * readdir and calling this callback, leaving a window
2455                  * where this directory entry could have gone away.
2456                  */
2457                 dput(dentry);
2458                 return nfserr_noent;
2459         }
2460
2461         exp_get(exp);
2462         /*
2463          * In the case of a mountpoint, the client may be asking for
2464          * attributes that are only properties of the underlying filesystem
2465          * as opposed to the cross-mounted file system. In such a case,
2466          * we will not follow the cross mount and will fill the attribtutes
2467          * directly from the mountpoint dentry.
2468          */
2469         if (nfsd_mountpoint(dentry, exp)) {
2470                 int err;
2471
2472                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2473                                 && !attributes_need_mount(cd->rd_bmval)) {
2474                         ignore_crossmnt = 1;
2475                         goto out_encode;
2476                 }
2477                 /*
2478                  * Why the heck aren't we just using nfsd_lookup??
2479                  * Different "."/".." handling?  Something else?
2480                  * At least, add a comment here to explain....
2481                  */
2482                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2483                 if (err) {
2484                         nfserr = nfserrno(err);
2485                         goto out_put;
2486                 }
2487                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2488                 if (nfserr)
2489                         goto out_put;
2490
2491         }
2492 out_encode:
2493         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2494                                         cd->rd_rqstp, ignore_crossmnt);
2495 out_put:
2496         dput(dentry);
2497         exp_put(exp);
2498         return nfserr;
2499 }
2500
2501 static __be32 *
2502 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2503 {
2504         __be32 *attrlenp;
2505
2506         if (buflen < 6)
2507                 return NULL;
2508         *p++ = htonl(2);
2509         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2510         *p++ = htonl(0);                         /* bmval1 */
2511
2512         attrlenp = p++;
2513         *p++ = nfserr;       /* no htonl */
2514         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2515         return p;
2516 }
2517
2518 static int
2519 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2520                     loff_t offset, u64 ino, unsigned int d_type)
2521 {
2522         struct readdir_cd *ccd = ccdv;
2523         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2524         int buflen;
2525         __be32 *p = cd->buffer;
2526         __be32 *cookiep;
2527         __be32 nfserr = nfserr_toosmall;
2528
2529         /* In nfsv4, "." and ".." never make it onto the wire.. */
2530         if (name && isdotent(name, namlen)) {
2531                 cd->common.err = nfs_ok;
2532                 return 0;
2533         }
2534
2535         if (cd->offset)
2536                 xdr_encode_hyper(cd->offset, (u64) offset);
2537
2538         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2539         if (buflen < 0)
2540                 goto fail;
2541
2542         *p++ = xdr_one;                             /* mark entry present */
2543         cookiep = p;
2544         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2545         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2546
2547         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2548         switch (nfserr) {
2549         case nfs_ok:
2550                 break;
2551         case nfserr_resource:
2552                 nfserr = nfserr_toosmall;
2553                 goto fail;
2554         case nfserr_noent:
2555                 goto skip_entry;
2556         default:
2557                 /*
2558                  * If the client requested the RDATTR_ERROR attribute,
2559                  * we stuff the error code into this attribute
2560                  * and continue.  If this attribute was not requested,
2561                  * then in accordance with the spec, we fail the
2562                  * entire READDIR operation(!)
2563                  */
2564                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2565                         goto fail;
2566                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2567                 if (p == NULL) {
2568                         nfserr = nfserr_toosmall;
2569                         goto fail;
2570                 }
2571         }
2572         cd->buflen -= (p - cd->buffer);
2573         cd->buffer = p;
2574         cd->offset = cookiep;
2575 skip_entry:
2576         cd->common.err = nfs_ok;
2577         return 0;
2578 fail:
2579         cd->common.err = nfserr;
2580         return -EINVAL;
2581 }
2582
2583 static void
2584 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2585 {
2586         __be32 *p;
2587
2588         RESERVE_SPACE(sizeof(stateid_t));
2589         WRITE32(sid->si_generation);
2590         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2591         ADJUST_ARGS();
2592 }
2593
2594 static __be32
2595 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2596 {
2597         __be32 *p;
2598
2599         if (!nfserr) {
2600                 RESERVE_SPACE(8);
2601                 WRITE32(access->ac_supported);
2602                 WRITE32(access->ac_resp_access);
2603                 ADJUST_ARGS();
2604         }
2605         return nfserr;
2606 }
2607
2608 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2609 {
2610         __be32 *p;
2611
2612         if (!nfserr) {
2613                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2614                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2615                 WRITE32(bcts->dir);
2616                 /* Sorry, we do not yet support RDMA over 4.1: */
2617                 WRITE32(0);
2618                 ADJUST_ARGS();
2619         }
2620         return nfserr;
2621 }
2622
2623 static __be32
2624 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2625 {
2626         if (!nfserr)
2627                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2628
2629         return nfserr;
2630 }
2631
2632
2633 static __be32
2634 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2635 {
2636         __be32 *p;
2637
2638         if (!nfserr) {
2639                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2640                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2641                 ADJUST_ARGS();
2642         }
2643         return nfserr;
2644 }
2645
2646 static __be32
2647 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2648 {
2649         __be32 *p;
2650
2651         if (!nfserr) {
2652                 RESERVE_SPACE(32);
2653                 write_cinfo(&p, &create->cr_cinfo);
2654                 WRITE32(2);
2655                 WRITE32(create->cr_bmval[0]);
2656                 WRITE32(create->cr_bmval[1]);
2657                 ADJUST_ARGS();
2658         }
2659         return nfserr;
2660 }
2661
2662 static __be32
2663 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2664 {
2665         struct svc_fh *fhp = getattr->ga_fhp;
2666         int buflen;
2667
2668         if (nfserr)
2669                 return nfserr;
2670
2671         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2672         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2673                                     &resp->p, buflen, getattr->ga_bmval,
2674                                     resp->rqstp, 0);
2675         return nfserr;
2676 }
2677
2678 static __be32
2679 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2680 {
2681         struct svc_fh *fhp = *fhpp;
2682         unsigned int len;
2683         __be32 *p;
2684
2685         if (!nfserr) {
2686                 len = fhp->fh_handle.fh_size;
2687                 RESERVE_SPACE(len + 4);
2688                 WRITE32(len);
2689                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2690                 ADJUST_ARGS();
2691         }
2692         return nfserr;
2693 }
2694
2695 /*
2696 * Including all fields other than the name, a LOCK4denied structure requires
2697 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2698 */
2699 static void
2700 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2701 {
2702         struct xdr_netobj *conf = &ld->ld_owner;
2703         __be32 *p;
2704
2705         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2706         WRITE64(ld->ld_start);
2707         WRITE64(ld->ld_length);
2708         WRITE32(ld->ld_type);
2709         if (conf->len) {
2710                 WRITEMEM(&ld->ld_clientid, 8);
2711                 WRITE32(conf->len);
2712                 WRITEMEM(conf->data, conf->len);
2713                 kfree(conf->data);
2714         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2715                 WRITE64((u64)0); /* clientid */
2716                 WRITE32(0); /* length of owner name */
2717         }
2718         ADJUST_ARGS();
2719 }
2720
2721 static __be32
2722 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2723 {
2724         if (!nfserr)
2725                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2726         else if (nfserr == nfserr_denied)
2727                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2728
2729         return nfserr;
2730 }
2731
2732 static __be32
2733 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2734 {
2735         if (nfserr == nfserr_denied)
2736                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2737         return nfserr;
2738 }
2739
2740 static __be32
2741 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2742 {
2743         if (!nfserr)
2744                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2745
2746         return nfserr;
2747 }
2748
2749
2750 static __be32
2751 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2752 {
2753         __be32 *p;
2754
2755         if (!nfserr) {
2756                 RESERVE_SPACE(20);
2757                 write_cinfo(&p, &link->li_cinfo);
2758                 ADJUST_ARGS();
2759         }
2760         return nfserr;
2761 }
2762
2763
2764 static __be32
2765 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2766 {
2767         __be32 *p;
2768
2769         if (nfserr)
2770                 goto out;
2771
2772         nfsd4_encode_stateid(resp, &open->op_stateid);
2773         RESERVE_SPACE(40);
2774         write_cinfo(&p, &open->op_cinfo);
2775         WRITE32(open->op_rflags);
2776         WRITE32(2);
2777         WRITE32(open->op_bmval[0]);
2778         WRITE32(open->op_bmval[1]);
2779         WRITE32(open->op_delegate_type);
2780         ADJUST_ARGS();
2781
2782         switch (open->op_delegate_type) {
2783         case NFS4_OPEN_DELEGATE_NONE:
2784                 break;
2785         case NFS4_OPEN_DELEGATE_READ:
2786                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2787                 RESERVE_SPACE(20);
2788                 WRITE32(open->op_recall);
2789
2790                 /*
2791                  * TODO: ACE's in delegations
2792                  */
2793                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2794                 WRITE32(0);
2795                 WRITE32(0);
2796                 WRITE32(0);   /* XXX: is NULL principal ok? */
2797                 ADJUST_ARGS();
2798                 break;
2799         case NFS4_OPEN_DELEGATE_WRITE:
2800                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2801                 RESERVE_SPACE(32);
2802                 WRITE32(0);
2803
2804                 /*
2805                  * TODO: space_limit's in delegations
2806                  */
2807                 WRITE32(NFS4_LIMIT_SIZE);
2808                 WRITE32(~(u32)0);
2809                 WRITE32(~(u32)0);
2810
2811                 /*
2812                  * TODO: ACE's in delegations
2813                  */
2814                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2815                 WRITE32(0);
2816                 WRITE32(0);
2817                 WRITE32(0);   /* XXX: is NULL principal ok? */
2818                 ADJUST_ARGS();
2819                 break;
2820         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2821                 switch (open->op_why_no_deleg) {
2822                 case WND4_CONTENTION:
2823                 case WND4_RESOURCE:
2824                         RESERVE_SPACE(8);
2825                         WRITE32(open->op_why_no_deleg);
2826                         WRITE32(0);     /* deleg signaling not supported yet */
2827                         break;
2828                 default:
2829                         RESERVE_SPACE(4);
2830                         WRITE32(open->op_why_no_deleg);
2831                 }
2832                 ADJUST_ARGS();
2833                 break;
2834         default:
2835                 BUG();
2836         }
2837         /* XXX save filehandle here */
2838 out:
2839         return nfserr;
2840 }
2841
2842 static __be32
2843 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2844 {
2845         if (!nfserr)
2846                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2847
2848         return nfserr;
2849 }
2850
2851 static __be32
2852 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2853 {
2854         if (!nfserr)
2855                 nfsd4_encode_stateid(resp, &od->od_stateid);
2856
2857         return nfserr;
2858 }
2859
2860 static __be32
2861 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2862                   struct nfsd4_read *read)
2863 {
2864         u32 eof;
2865         int v;
2866         struct page *page;
2867         unsigned long maxcount; 
2868         long len;
2869         __be32 *p;
2870
2871         if (nfserr)
2872                 return nfserr;
2873         if (resp->xbuf->page_len)
2874                 return nfserr_resource;
2875
2876         RESERVE_SPACE(8); /* eof flag and byte count */
2877
2878         maxcount = svc_max_payload(resp->rqstp);
2879         if (maxcount > read->rd_length)
2880                 maxcount = read->rd_length;
2881
2882         len = maxcount;
2883         v = 0;
2884         while (len > 0) {
2885                 page = *(resp->rqstp->rq_next_page);
2886                 if (!page) { /* ran out of pages */
2887                         maxcount -= len;
2888                         break;
2889                 }
2890                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2891                 resp->rqstp->rq_vec[v].iov_len =
2892                         len < PAGE_SIZE ? len : PAGE_SIZE;
2893                 resp->rqstp->rq_next_page++;
2894                 v++;
2895                 len -= PAGE_SIZE;
2896         }
2897         read->rd_vlen = v;
2898
2899         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2900                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2901                         &maxcount);
2902
2903         if (nfserr)
2904                 return nfserr;
2905         eof = (read->rd_offset + maxcount >=
2906                read->rd_fhp->fh_dentry->d_inode->i_size);
2907
2908         WRITE32(eof);
2909         WRITE32(maxcount);
2910         ADJUST_ARGS();
2911         resp->xbuf->head[0].iov_len = (char*)p
2912                                         - (char*)resp->xbuf->head[0].iov_base;
2913         resp->xbuf->page_len = maxcount;
2914
2915         /* Use rest of head for padding and remaining ops: */
2916         resp->xbuf->tail[0].iov_base = p;
2917         resp->xbuf->tail[0].iov_len = 0;
2918         if (maxcount&3) {
2919                 RESERVE_SPACE(4);
2920                 WRITE32(0);
2921                 resp->xbuf->tail[0].iov_base += maxcount&3;
2922                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2923                 ADJUST_ARGS();
2924         }
2925         return 0;
2926 }
2927
2928 static __be32
2929 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2930 {
2931         int maxcount;
2932         char *page;
2933         __be32 *p;
2934
2935         if (nfserr)
2936                 return nfserr;
2937         if (resp->xbuf->page_len)
2938                 return nfserr_resource;
2939         if (!*resp->rqstp->rq_next_page)
2940                 return nfserr_resource;
2941
2942         page = page_address(*(resp->rqstp->rq_next_page++));
2943
2944         maxcount = PAGE_SIZE;
2945         RESERVE_SPACE(4);
2946
2947         /*
2948          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2949          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2950          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2951          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2952          */
2953         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2954         if (nfserr == nfserr_isdir)
2955                 return nfserr_inval;
2956         if (nfserr)
2957                 return nfserr;
2958
2959         WRITE32(maxcount);
2960         ADJUST_ARGS();
2961         resp->xbuf->head[0].iov_len = (char*)p
2962                                 - (char*)resp->xbuf->head[0].iov_base;
2963         resp->xbuf->page_len = maxcount;
2964
2965         /* Use rest of head for padding and remaining ops: */
2966         resp->xbuf->tail[0].iov_base = p;
2967         resp->xbuf->tail[0].iov_len = 0;
2968         if (maxcount&3) {
2969                 RESERVE_SPACE(4);
2970                 WRITE32(0);
2971                 resp->xbuf->tail[0].iov_base += maxcount&3;
2972                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2973                 ADJUST_ARGS();
2974         }
2975         return 0;
2976 }
2977
2978 static __be32
2979 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2980 {
2981         int maxcount;
2982         loff_t offset;
2983         __be32 *page, *savep, *tailbase;
2984         __be32 *p;
2985
2986         if (nfserr)
2987                 return nfserr;
2988         if (resp->xbuf->page_len)
2989                 return nfserr_resource;
2990         if (!*resp->rqstp->rq_next_page)
2991                 return nfserr_resource;
2992
2993         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2994         savep = p;
2995
2996         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2997         WRITE32(0);
2998         WRITE32(0);
2999         ADJUST_ARGS();
3000         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3001         tailbase = p;
3002
3003         maxcount = PAGE_SIZE;
3004         if (maxcount > readdir->rd_maxcount)
3005                 maxcount = readdir->rd_maxcount;
3006
3007         /*
3008          * Convert from bytes to words, account for the two words already
3009          * written, make sure to leave two words at the end for the next
3010          * pointer and eof field.
3011          */
3012         maxcount = (maxcount >> 2) - 4;
3013         if (maxcount < 0) {
3014                 nfserr =  nfserr_toosmall;
3015                 goto err_no_verf;
3016         }
3017
3018         page = page_address(*(resp->rqstp->rq_next_page++));
3019         readdir->common.err = 0;
3020         readdir->buflen = maxcount;
3021         readdir->buffer = page;
3022         readdir->offset = NULL;
3023
3024         offset = readdir->rd_cookie;
3025         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3026                               &offset,
3027                               &readdir->common, nfsd4_encode_dirent);
3028         if (nfserr == nfs_ok &&
3029             readdir->common.err == nfserr_toosmall &&
3030             readdir->buffer == page) 
3031                 nfserr = nfserr_toosmall;
3032         if (nfserr)
3033                 goto err_no_verf;
3034
3035         if (readdir->offset)
3036                 xdr_encode_hyper(readdir->offset, offset);
3037
3038         p = readdir->buffer;
3039         *p++ = 0;       /* no more entries */
3040         *p++ = htonl(readdir->common.err == nfserr_eof);
3041         resp->xbuf->page_len = ((char*)p) -
3042                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3043
3044         /* Use rest of head for padding and remaining ops: */
3045         resp->xbuf->tail[0].iov_base = tailbase;
3046         resp->xbuf->tail[0].iov_len = 0;
3047         resp->p = resp->xbuf->tail[0].iov_base;
3048         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3049
3050         return 0;
3051 err_no_verf:
3052         p = savep;
3053         ADJUST_ARGS();
3054         return nfserr;
3055 }
3056
3057 static __be32
3058 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3059 {
3060         __be32 *p;
3061
3062         if (!nfserr) {
3063                 RESERVE_SPACE(20);
3064                 write_cinfo(&p, &remove->rm_cinfo);
3065                 ADJUST_ARGS();
3066         }
3067         return nfserr;
3068 }
3069
3070 static __be32
3071 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3072 {
3073         __be32 *p;
3074
3075         if (!nfserr) {
3076                 RESERVE_SPACE(40);
3077                 write_cinfo(&p, &rename->rn_sinfo);
3078                 write_cinfo(&p, &rename->rn_tinfo);
3079                 ADJUST_ARGS();
3080         }
3081         return nfserr;
3082 }
3083
3084 static __be32
3085 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3086                          __be32 nfserr, struct svc_export *exp)
3087 {
3088         u32 i, nflavs, supported;
3089         struct exp_flavor_info *flavs;
3090         struct exp_flavor_info def_flavs[2];
3091         __be32 *p, *flavorsp;
3092         static bool report = true;
3093
3094         if (nfserr)
3095                 goto out;
3096         if (exp->ex_nflavors) {
3097                 flavs = exp->ex_flavors;
3098                 nflavs = exp->ex_nflavors;
3099         } else { /* Handling of some defaults in absence of real secinfo: */
3100                 flavs = def_flavs;
3101                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3102                         nflavs = 2;
3103                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3104                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3105                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3106                         nflavs = 1;
3107                         flavs[0].pseudoflavor
3108                                         = svcauth_gss_flavor(exp->ex_client);
3109                 } else {
3110                         nflavs = 1;
3111                         flavs[0].pseudoflavor
3112                                         = exp->ex_client->flavour->flavour;
3113                 }
3114         }
3115
3116         supported = 0;
3117         RESERVE_SPACE(4);
3118         flavorsp = p++;         /* to be backfilled later */
3119         ADJUST_ARGS();
3120
3121         for (i = 0; i < nflavs; i++) {
3122                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3123                 struct rpcsec_gss_info info;
3124
3125                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3126                         supported++;
3127                         RESERVE_SPACE(4 + 4 + info.oid.len + 4 + 4);
3128                         WRITE32(RPC_AUTH_GSS);
3129                         WRITE32(info.oid.len);
3130                         WRITEMEM(info.oid.data, info.oid.len);
3131                         WRITE32(info.qop);
3132                         WRITE32(info.service);
3133                         ADJUST_ARGS();
3134                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3135                         supported++;
3136                         RESERVE_SPACE(4);
3137                         WRITE32(pf);
3138                         ADJUST_ARGS();
3139                 } else {
3140                         if (report)
3141                                 pr_warn("NFS: SECINFO: security flavor %u "
3142                                         "is not supported\n", pf);
3143                 }
3144         }
3145
3146         if (nflavs != supported)
3147                 report = false;
3148         *flavorsp = htonl(supported);
3149
3150 out:
3151         if (exp)
3152                 exp_put(exp);
3153         return nfserr;
3154 }
3155
3156 static __be32
3157 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3158                      struct nfsd4_secinfo *secinfo)
3159 {
3160         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3161 }
3162
3163 static __be32
3164 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3165                      struct nfsd4_secinfo_no_name *secinfo)
3166 {
3167         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3168 }
3169
3170 /*
3171  * The SETATTR encode routine is special -- it always encodes a bitmap,
3172  * regardless of the error status.
3173  */
3174 static __be32
3175 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3176 {
3177         __be32 *p;
3178
3179         RESERVE_SPACE(12);
3180         if (nfserr) {
3181                 WRITE32(2);
3182                 WRITE32(0);
3183                 WRITE32(0);
3184         }
3185         else {
3186                 WRITE32(2);
3187                 WRITE32(setattr->sa_bmval[0]);
3188                 WRITE32(setattr->sa_bmval[1]);
3189         }
3190         ADJUST_ARGS();
3191         return nfserr;
3192 }
3193
3194 static __be32
3195 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3196 {
3197         __be32 *p;
3198
3199         if (!nfserr) {
3200                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3201                 WRITEMEM(&scd->se_clientid, 8);
3202                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3203                 ADJUST_ARGS();
3204         }
3205         else if (nfserr == nfserr_clid_inuse) {
3206                 RESERVE_SPACE(8);
3207                 WRITE32(0);
3208                 WRITE32(0);
3209                 ADJUST_ARGS();
3210         }
3211         return nfserr;
3212 }
3213
3214 static __be32
3215 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3216 {
3217         __be32 *p;
3218
3219         if (!nfserr) {
3220                 RESERVE_SPACE(16);
3221                 WRITE32(write->wr_bytes_written);
3222                 WRITE32(write->wr_how_written);
3223                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3224                 ADJUST_ARGS();
3225         }
3226         return nfserr;
3227 }
3228
3229 static __be32
3230 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3231                          struct nfsd4_exchange_id *exid)
3232 {
3233         __be32 *p;
3234         char *major_id;
3235         char *server_scope;
3236         int major_id_sz;
3237         int server_scope_sz;
3238         uint64_t minor_id = 0;
3239
3240         if (nfserr)
3241                 return nfserr;
3242
3243         major_id = utsname()->nodename;
3244         major_id_sz = strlen(major_id);
3245         server_scope = utsname()->nodename;
3246         server_scope_sz = strlen(server_scope);
3247
3248         RESERVE_SPACE(
3249                 8 /* eir_clientid */ +
3250                 4 /* eir_sequenceid */ +
3251                 4 /* eir_flags */ +
3252                 4 /* spr_how (SP4_NONE) */ +
3253                 8 /* so_minor_id */ +
3254                 4 /* so_major_id.len */ +
3255                 (XDR_QUADLEN(major_id_sz) * 4) +
3256                 4 /* eir_server_scope.len */ +
3257                 (XDR_QUADLEN(server_scope_sz) * 4) +
3258                 4 /* eir_server_impl_id.count (0) */);
3259
3260         WRITEMEM(&exid->clientid, 8);
3261         WRITE32(exid->seqid);
3262         WRITE32(exid->flags);
3263
3264         /* state_protect4_r. Currently only support SP4_NONE */
3265         BUG_ON(exid->spa_how != SP4_NONE);
3266         WRITE32(exid->spa_how);
3267
3268         /* The server_owner struct */
3269         WRITE64(minor_id);      /* Minor id */
3270         /* major id */
3271         WRITE32(major_id_sz);
3272         WRITEMEM(major_id, major_id_sz);
3273
3274         /* Server scope */
3275         WRITE32(server_scope_sz);
3276         WRITEMEM(server_scope, server_scope_sz);
3277
3278         /* Implementation id */
3279         WRITE32(0);     /* zero length nfs_impl_id4 array */
3280         ADJUST_ARGS();
3281         return 0;
3282 }
3283
3284 static __be32
3285 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3286                             struct nfsd4_create_session *sess)
3287 {
3288         __be32 *p;
3289
3290         if (nfserr)
3291                 return nfserr;
3292
3293         RESERVE_SPACE(24);
3294         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3295         WRITE32(sess->seqid);
3296         WRITE32(sess->flags);
3297         ADJUST_ARGS();
3298
3299         RESERVE_SPACE(28);
3300         WRITE32(0); /* headerpadsz */
3301         WRITE32(sess->fore_channel.maxreq_sz);
3302         WRITE32(sess->fore_channel.maxresp_sz);
3303         WRITE32(sess->fore_channel.maxresp_cached);
3304         WRITE32(sess->fore_channel.maxops);
3305         WRITE32(sess->fore_channel.maxreqs);
3306         WRITE32(sess->fore_channel.nr_rdma_attrs);
3307         ADJUST_ARGS();
3308
3309         if (sess->fore_channel.nr_rdma_attrs) {
3310                 RESERVE_SPACE(4);
3311                 WRITE32(sess->fore_channel.rdma_attrs);
3312                 ADJUST_ARGS();
3313         }
3314
3315         RESERVE_SPACE(28);
3316         WRITE32(0); /* headerpadsz */
3317         WRITE32(sess->back_channel.maxreq_sz);
3318         WRITE32(sess->back_channel.maxresp_sz);
3319         WRITE32(sess->back_channel.maxresp_cached);
3320         WRITE32(sess->back_channel.maxops);
3321         WRITE32(sess->back_channel.maxreqs);
3322         WRITE32(sess->back_channel.nr_rdma_attrs);
3323         ADJUST_ARGS();
3324
3325         if (sess->back_channel.nr_rdma_attrs) {
3326                 RESERVE_SPACE(4);
3327                 WRITE32(sess->back_channel.rdma_attrs);
3328                 ADJUST_ARGS();
3329         }
3330         return 0;
3331 }
3332
3333 static __be32
3334 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3335                              struct nfsd4_destroy_session *destroy_session)
3336 {
3337         return nfserr;
3338 }
3339
3340 static __be32
3341 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3342                           struct nfsd4_free_stateid *free_stateid)
3343 {
3344         __be32 *p;
3345
3346         if (nfserr)
3347                 return nfserr;
3348
3349         RESERVE_SPACE(4);
3350         *p++ = nfserr;
3351         ADJUST_ARGS();
3352         return nfserr;
3353 }
3354
3355 static __be32
3356 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3357                       struct nfsd4_sequence *seq)
3358 {
3359         __be32 *p;
3360
3361         if (nfserr)
3362                 return nfserr;
3363
3364         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3365         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3366         WRITE32(seq->seqid);
3367         WRITE32(seq->slotid);
3368         /* Note slotid's are numbered from zero: */
3369         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3370         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3371         WRITE32(seq->status_flags);
3372
3373         ADJUST_ARGS();
3374         resp->cstate.datap = p; /* DRC cache data pointer */
3375         return 0;
3376 }
3377
3378 static __be32
3379 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3380                           struct nfsd4_test_stateid *test_stateid)
3381 {
3382         struct nfsd4_test_stateid_id *stateid, *next;
3383         __be32 *p;
3384
3385         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3386         *p++ = htonl(test_stateid->ts_num_ids);
3387
3388         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3389                 *p++ = stateid->ts_id_status;
3390         }
3391
3392         ADJUST_ARGS();
3393         return nfserr;
3394 }
3395
3396 static __be32
3397 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3398 {
3399         return nfserr;
3400 }
3401
3402 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3403
3404 /*
3405  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3406  * since we don't need to filter out obsolete ops as this is
3407  * done in the decoding phase.
3408  */
3409 static nfsd4_enc nfsd4_enc_ops[] = {
3410         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3411         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3412         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3413         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3414         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3415         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3416         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3417         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3418         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3419         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3420         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3421         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3422         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3423         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3424         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3425         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3426         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3427         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3428         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3429         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3430         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3431         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3432         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3433         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3434         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3435         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3436         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3437         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3438         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3439         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3440         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3441         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3442         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3443         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3444         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3445         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3446         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3447
3448         /* NFSv4.1 operations */
3449         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3450         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3451         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3452         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3453         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3454         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3455         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3456         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3457         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3458         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3459         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3460         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3461         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3462         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3463         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3464         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3465         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3466         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3467         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3468 };
3469
3470 /*
3471  * Calculate the total amount of memory that the compound response has taken
3472  * after encoding the current operation with pad.
3473  *
3474  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3475  *      which was specified at nfsd4_operation, else pad is zero.
3476  *
3477  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3478  *
3479  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3480  * will be at least a page and will therefore hold the xdr_buf head.
3481  */
3482 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3483 {
3484         struct xdr_buf *xb = &resp->rqstp->rq_res;
3485         struct nfsd4_session *session = NULL;
3486         struct nfsd4_slot *slot = resp->cstate.slot;
3487         u32 length, tlen = 0;
3488
3489         if (!nfsd4_has_session(&resp->cstate))
3490                 return 0;
3491
3492         session = resp->cstate.session;
3493         if (session == NULL)
3494                 return 0;
3495
3496         if (xb->page_len == 0) {
3497                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3498         } else {
3499                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3500                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3501
3502                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3503         }
3504         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3505                 length, xb->page_len, tlen, pad);
3506
3507         if (length > session->se_fchannel.maxresp_sz)
3508                 return nfserr_rep_too_big;
3509
3510         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3511             length > session->se_fchannel.maxresp_cached)
3512                 return nfserr_rep_too_big_to_cache;
3513
3514         return 0;
3515 }
3516
3517 void
3518 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3519 {
3520         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3521         __be32 *statp;
3522         __be32 *p;
3523
3524         RESERVE_SPACE(8);
3525         WRITE32(op->opnum);
3526         statp = p++;    /* to be backfilled at the end */
3527         ADJUST_ARGS();
3528
3529         if (op->opnum == OP_ILLEGAL)
3530                 goto status;
3531         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3532                !nfsd4_enc_ops[op->opnum]);
3533         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3534         /* nfsd4_check_drc_limit guarantees enough room for error status */
3535         if (!op->status)
3536                 op->status = nfsd4_check_resp_size(resp, 0);
3537         if (so) {
3538                 so->so_replay.rp_status = op->status;
3539                 so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3540                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3541         }
3542 status:
3543         /*
3544          * Note: We write the status directly, instead of using WRITE32(),
3545          * since it is already in network byte order.
3546          */
3547         *statp = op->status;
3548 }
3549
3550 /* 
3551  * Encode the reply stored in the stateowner reply cache 
3552  * 
3553  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3554  * previously sent already encoded operation.
3555  *
3556  * called with nfs4_lock_state() held
3557  */
3558 void
3559 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3560 {
3561         __be32 *p;
3562         struct nfs4_replay *rp = op->replay;
3563
3564         BUG_ON(!rp);
3565
3566         RESERVE_SPACE(8);
3567         WRITE32(op->opnum);
3568         *p++ = rp->rp_status;  /* already xdr'ed */
3569         ADJUST_ARGS();
3570
3571         RESERVE_SPACE(rp->rp_buflen);
3572         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3573         ADJUST_ARGS();
3574 }
3575
3576 int
3577 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3578 {
3579         return xdr_ressize_check(rqstp, p);
3580 }
3581
3582 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3583 {
3584         struct svc_rqst *rqstp = rq;
3585         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3586
3587         if (args->ops != args->iops) {
3588                 kfree(args->ops);
3589                 args->ops = args->iops;
3590         }
3591         kfree(args->tmpp);
3592         args->tmpp = NULL;
3593         while (args->to_free) {
3594                 struct tmpbuf *tb = args->to_free;
3595                 args->to_free = tb->next;
3596                 tb->release(tb->buf);
3597                 kfree(tb);
3598         }
3599         return 1;
3600 }
3601
3602 int
3603 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3604 {
3605         args->p = p;
3606         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3607         args->pagelist = rqstp->rq_arg.pages;
3608         args->pagelen = rqstp->rq_arg.page_len;
3609         args->tmpp = NULL;
3610         args->to_free = NULL;
3611         args->ops = args->iops;
3612         args->rqstp = rqstp;
3613
3614         return !nfsd4_decode_compound(args);
3615 }
3616
3617 int
3618 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3619 {
3620         /*
3621          * All that remains is to write the tag and operation count...
3622          */
3623         struct nfsd4_compound_state *cs = &resp->cstate;
3624         struct kvec *iov;
3625         p = resp->tagp;
3626         *p++ = htonl(resp->taglen);
3627         memcpy(p, resp->tag, resp->taglen);
3628         p += XDR_QUADLEN(resp->taglen);
3629         *p++ = htonl(resp->opcnt);
3630
3631         if (rqstp->rq_res.page_len) 
3632                 iov = &rqstp->rq_res.tail[0];
3633         else
3634                 iov = &rqstp->rq_res.head[0];
3635         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3636         BUG_ON(iov->iov_len > PAGE_SIZE);
3637         if (nfsd4_has_session(cs)) {
3638                 if (cs->status != nfserr_replay_cache) {
3639                         nfsd4_store_cache_entry(resp);
3640                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3641                 }
3642                 /* Renew the clientid on success and on replay */
3643                 put_client_renew(cs->session->se_client);
3644                 nfsd4_put_session(cs->session);
3645         }
3646         return 1;
3647 }
3648
3649 /*
3650  * Local variables:
3651  *  c-basic-offset: 8
3652  * End:
3653  */