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