Merge branch 'idr-2018-02-06' of git://git.infradead.org/users/willy/linux-dax
[muen/linux.git] / fs / nfsd / nfs4xdr.c
1 /*
2  *  Server-side XDR for NFSv4
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  */
35
36 #include <linux/fs_struct.h>
37 #include <linux/file.h>
38 #include <linux/slab.h>
39 #include <linux/namei.h>
40 #include <linux/statfs.h>
41 #include <linux/utsname.h>
42 #include <linux/pagemap.h>
43 #include <linux/sunrpc/svcauth_gss.h>
44
45 #include "idmap.h"
46 #include "acl.h"
47 #include "xdr4.h"
48 #include "vfs.h"
49 #include "state.h"
50 #include "cache.h"
51 #include "netns.h"
52 #include "pnfs.h"
53
54 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
55 #include <linux/security.h>
56 #endif
57
58
59 #define NFSDDBG_FACILITY                NFSDDBG_XDR
60
61 const u32 nfsd_suppattrs[3][3] = {
62         {NFSD4_SUPPORTED_ATTRS_WORD0,
63          NFSD4_SUPPORTED_ATTRS_WORD1,
64          NFSD4_SUPPORTED_ATTRS_WORD2},
65
66         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
67          NFSD4_1_SUPPORTED_ATTRS_WORD1,
68          NFSD4_1_SUPPORTED_ATTRS_WORD2},
69
70         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
71          NFSD4_1_SUPPORTED_ATTRS_WORD1,
72          NFSD4_2_SUPPORTED_ATTRS_WORD2},
73 };
74
75 /*
76  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
77  * directory in order to indicate to the client that a filesystem boundary is present
78  * We use a fixed fsid for a referral
79  */
80 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
81 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
82
83 static __be32
84 check_filename(char *str, int len)
85 {
86         int i;
87
88         if (len == 0)
89                 return nfserr_inval;
90         if (isdotent(str, len))
91                 return nfserr_badname;
92         for (i = 0; i < len; i++)
93                 if (str[i] == '/')
94                         return nfserr_badname;
95         return 0;
96 }
97
98 #define DECODE_HEAD                             \
99         __be32 *p;                              \
100         __be32 status
101 #define DECODE_TAIL                             \
102         status = 0;                             \
103 out:                                            \
104         return status;                          \
105 xdr_error:                                      \
106         dprintk("NFSD: xdr error (%s:%d)\n",    \
107                         __FILE__, __LINE__);    \
108         status = nfserr_bad_xdr;                \
109         goto out
110
111 #define READMEM(x,nbytes) do {                  \
112         x = (char *)p;                          \
113         p += XDR_QUADLEN(nbytes);               \
114 } while (0)
115 #define SAVEMEM(x,nbytes) do {                  \
116         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
117                 savemem(argp, p, nbytes) :      \
118                 (char *)p)) {                   \
119                 dprintk("NFSD: xdr error (%s:%d)\n", \
120                                 __FILE__, __LINE__); \
121                 goto xdr_error;                 \
122                 }                               \
123         p += XDR_QUADLEN(nbytes);               \
124 } while (0)
125 #define COPYMEM(x,nbytes) do {                  \
126         memcpy((x), p, nbytes);                 \
127         p += XDR_QUADLEN(nbytes);               \
128 } while (0)
129
130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
131 #define READ_BUF(nbytes)  do {                  \
132         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
133                 p = argp->p;                    \
134                 argp->p += XDR_QUADLEN(nbytes); \
135         } else if (!(p = read_buf(argp, nbytes))) { \
136                 dprintk("NFSD: xdr error (%s:%d)\n", \
137                                 __FILE__, __LINE__); \
138                 goto xdr_error;                 \
139         }                                       \
140 } while (0)
141
142 static void next_decode_page(struct nfsd4_compoundargs *argp)
143 {
144         argp->p = page_address(argp->pagelist[0]);
145         argp->pagelist++;
146         if (argp->pagelen < PAGE_SIZE) {
147                 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
148                 argp->pagelen = 0;
149         } else {
150                 argp->end = argp->p + (PAGE_SIZE>>2);
151                 argp->pagelen -= PAGE_SIZE;
152         }
153 }
154
155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
156 {
157         /* We want more bytes than seem to be available.
158          * Maybe we need a new page, maybe we have just run out
159          */
160         unsigned int avail = (char *)argp->end - (char *)argp->p;
161         __be32 *p;
162
163         if (argp->pagelen == 0) {
164                 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
165
166                 if (!argp->tail) {
167                         argp->tail = true;
168                         avail = vec->iov_len;
169                         argp->p = vec->iov_base;
170                         argp->end = vec->iov_base + avail;
171                 }
172
173                 if (avail < nbytes)
174                         return NULL;
175
176                 p = argp->p;
177                 argp->p += XDR_QUADLEN(nbytes);
178                 return p;
179         }
180
181         if (avail + argp->pagelen < nbytes)
182                 return NULL;
183         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
184                 return NULL;
185         /* ok, we can do it with the current plus the next page */
186         if (nbytes <= sizeof(argp->tmp))
187                 p = argp->tmp;
188         else {
189                 kfree(argp->tmpp);
190                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
191                 if (!p)
192                         return NULL;
193                 
194         }
195         /*
196          * The following memcpy is safe because read_buf is always
197          * called with nbytes > avail, and the two cases above both
198          * guarantee p points to at least nbytes bytes.
199          */
200         memcpy(p, argp->p, avail);
201         next_decode_page(argp);
202         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
203         argp->p += XDR_QUADLEN(nbytes - avail);
204         return p;
205 }
206
207 static int zero_clientid(clientid_t *clid)
208 {
209         return (clid->cl_boot == 0) && (clid->cl_id == 0);
210 }
211
212 /**
213  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
214  * @argp: NFSv4 compound argument structure
215  * @p: pointer to be freed (with kfree())
216  *
217  * Marks @p to be freed when processing the compound operation
218  * described in @argp finishes.
219  */
220 static void *
221 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
222 {
223         struct svcxdr_tmpbuf *tb;
224
225         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
226         if (!tb)
227                 return NULL;
228         tb->next = argp->to_free;
229         argp->to_free = tb;
230         return tb->buf;
231 }
232
233 /*
234  * For xdr strings that need to be passed to other kernel api's
235  * as null-terminated strings.
236  *
237  * Note null-terminating in place usually isn't safe since the
238  * buffer might end on a page boundary.
239  */
240 static char *
241 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
242 {
243         char *p = svcxdr_tmpalloc(argp, len + 1);
244
245         if (!p)
246                 return NULL;
247         memcpy(p, buf, len);
248         p[len] = '\0';
249         return p;
250 }
251
252 /**
253  * savemem - duplicate a chunk of memory for later processing
254  * @argp: NFSv4 compound argument structure to be freed with
255  * @p: pointer to be duplicated
256  * @nbytes: length to be duplicated
257  *
258  * Returns a pointer to a copy of @nbytes bytes of memory at @p
259  * that are preserved until processing of the NFSv4 compound
260  * operation described by @argp finishes.
261  */
262 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
263 {
264         void *ret;
265
266         ret = svcxdr_tmpalloc(argp, nbytes);
267         if (!ret)
268                 return NULL;
269         memcpy(ret, p, nbytes);
270         return ret;
271 }
272
273 /*
274  * We require the high 32 bits of 'seconds' to be 0, and
275  * we ignore all 32 bits of 'nseconds'.
276  */
277 static __be32
278 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
279 {
280         DECODE_HEAD;
281         u64 sec;
282
283         READ_BUF(12);
284         p = xdr_decode_hyper(p, &sec);
285         tv->tv_sec = sec;
286         tv->tv_nsec = be32_to_cpup(p++);
287         if (tv->tv_nsec >= (u32)1000000000)
288                 return nfserr_inval;
289
290         DECODE_TAIL;
291 }
292
293 static __be32
294 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
295 {
296         u32 bmlen;
297         DECODE_HEAD;
298
299         bmval[0] = 0;
300         bmval[1] = 0;
301         bmval[2] = 0;
302
303         READ_BUF(4);
304         bmlen = be32_to_cpup(p++);
305         if (bmlen > 1000)
306                 goto xdr_error;
307
308         READ_BUF(bmlen << 2);
309         if (bmlen > 0)
310                 bmval[0] = be32_to_cpup(p++);
311         if (bmlen > 1)
312                 bmval[1] = be32_to_cpup(p++);
313         if (bmlen > 2)
314                 bmval[2] = be32_to_cpup(p++);
315
316         DECODE_TAIL;
317 }
318
319 static __be32
320 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
321                    struct iattr *iattr, struct nfs4_acl **acl,
322                    struct xdr_netobj *label, int *umask)
323 {
324         int expected_len, len = 0;
325         u32 dummy32;
326         char *buf;
327
328         DECODE_HEAD;
329         iattr->ia_valid = 0;
330         if ((status = nfsd4_decode_bitmap(argp, bmval)))
331                 return status;
332
333         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
334             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
335             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
336                 if (nfsd_attrs_supported(argp->minorversion, bmval))
337                         return nfserr_inval;
338                 return nfserr_attrnotsupp;
339         }
340
341         READ_BUF(4);
342         expected_len = be32_to_cpup(p++);
343
344         if (bmval[0] & FATTR4_WORD0_SIZE) {
345                 READ_BUF(8);
346                 len += 8;
347                 p = xdr_decode_hyper(p, &iattr->ia_size);
348                 iattr->ia_valid |= ATTR_SIZE;
349         }
350         if (bmval[0] & FATTR4_WORD0_ACL) {
351                 u32 nace;
352                 struct nfs4_ace *ace;
353
354                 READ_BUF(4); len += 4;
355                 nace = be32_to_cpup(p++);
356
357                 if (nace > NFS4_ACL_MAX)
358                         return nfserr_fbig;
359
360                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
361                 if (*acl == NULL)
362                         return nfserr_jukebox;
363
364                 (*acl)->naces = nace;
365                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
366                         READ_BUF(16); len += 16;
367                         ace->type = be32_to_cpup(p++);
368                         ace->flag = be32_to_cpup(p++);
369                         ace->access_mask = be32_to_cpup(p++);
370                         dummy32 = be32_to_cpup(p++);
371                         READ_BUF(dummy32);
372                         len += XDR_QUADLEN(dummy32) << 2;
373                         READMEM(buf, dummy32);
374                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
375                         status = nfs_ok;
376                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
377                                 ;
378                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
379                                 status = nfsd_map_name_to_gid(argp->rqstp,
380                                                 buf, dummy32, &ace->who_gid);
381                         else
382                                 status = nfsd_map_name_to_uid(argp->rqstp,
383                                                 buf, dummy32, &ace->who_uid);
384                         if (status)
385                                 return status;
386                 }
387         } else
388                 *acl = NULL;
389         if (bmval[1] & FATTR4_WORD1_MODE) {
390                 READ_BUF(4);
391                 len += 4;
392                 iattr->ia_mode = be32_to_cpup(p++);
393                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
394                 iattr->ia_valid |= ATTR_MODE;
395         }
396         if (bmval[1] & FATTR4_WORD1_OWNER) {
397                 READ_BUF(4);
398                 len += 4;
399                 dummy32 = be32_to_cpup(p++);
400                 READ_BUF(dummy32);
401                 len += (XDR_QUADLEN(dummy32) << 2);
402                 READMEM(buf, dummy32);
403                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
404                         return status;
405                 iattr->ia_valid |= ATTR_UID;
406         }
407         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
408                 READ_BUF(4);
409                 len += 4;
410                 dummy32 = be32_to_cpup(p++);
411                 READ_BUF(dummy32);
412                 len += (XDR_QUADLEN(dummy32) << 2);
413                 READMEM(buf, dummy32);
414                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
415                         return status;
416                 iattr->ia_valid |= ATTR_GID;
417         }
418         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
419                 READ_BUF(4);
420                 len += 4;
421                 dummy32 = be32_to_cpup(p++);
422                 switch (dummy32) {
423                 case NFS4_SET_TO_CLIENT_TIME:
424                         len += 12;
425                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
426                         if (status)
427                                 return status;
428                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
429                         break;
430                 case NFS4_SET_TO_SERVER_TIME:
431                         iattr->ia_valid |= ATTR_ATIME;
432                         break;
433                 default:
434                         goto xdr_error;
435                 }
436         }
437         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
438                 READ_BUF(4);
439                 len += 4;
440                 dummy32 = be32_to_cpup(p++);
441                 switch (dummy32) {
442                 case NFS4_SET_TO_CLIENT_TIME:
443                         len += 12;
444                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
445                         if (status)
446                                 return status;
447                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
448                         break;
449                 case NFS4_SET_TO_SERVER_TIME:
450                         iattr->ia_valid |= ATTR_MTIME;
451                         break;
452                 default:
453                         goto xdr_error;
454                 }
455         }
456
457         label->len = 0;
458 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
459         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
460                 READ_BUF(4);
461                 len += 4;
462                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
463                 READ_BUF(4);
464                 len += 4;
465                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
466                 READ_BUF(4);
467                 len += 4;
468                 dummy32 = be32_to_cpup(p++);
469                 READ_BUF(dummy32);
470                 if (dummy32 > NFS4_MAXLABELLEN)
471                         return nfserr_badlabel;
472                 len += (XDR_QUADLEN(dummy32) << 2);
473                 READMEM(buf, dummy32);
474                 label->len = dummy32;
475                 label->data = svcxdr_dupstr(argp, buf, dummy32);
476                 if (!label->data)
477                         return nfserr_jukebox;
478         }
479 #endif
480         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
481                 if (!umask)
482                         goto xdr_error;
483                 READ_BUF(8);
484                 len += 8;
485                 dummy32 = be32_to_cpup(p++);
486                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
487                 dummy32 = be32_to_cpup(p++);
488                 *umask = dummy32 & S_IRWXUGO;
489                 iattr->ia_valid |= ATTR_MODE;
490         }
491         if (len != expected_len)
492                 goto xdr_error;
493
494         DECODE_TAIL;
495 }
496
497 static __be32
498 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
499 {
500         DECODE_HEAD;
501
502         READ_BUF(sizeof(stateid_t));
503         sid->si_generation = be32_to_cpup(p++);
504         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
505
506         DECODE_TAIL;
507 }
508
509 static __be32
510 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
511 {
512         DECODE_HEAD;
513
514         READ_BUF(4);
515         access->ac_req_access = be32_to_cpup(p++);
516
517         DECODE_TAIL;
518 }
519
520 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
521 {
522         DECODE_HEAD;
523         u32 dummy, uid, gid;
524         char *machine_name;
525         int i;
526         int nr_secflavs;
527
528         /* callback_sec_params4 */
529         READ_BUF(4);
530         nr_secflavs = be32_to_cpup(p++);
531         if (nr_secflavs)
532                 cbs->flavor = (u32)(-1);
533         else
534                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
535                 cbs->flavor = 0;
536         for (i = 0; i < nr_secflavs; ++i) {
537                 READ_BUF(4);
538                 dummy = be32_to_cpup(p++);
539                 switch (dummy) {
540                 case RPC_AUTH_NULL:
541                         /* Nothing to read */
542                         if (cbs->flavor == (u32)(-1))
543                                 cbs->flavor = RPC_AUTH_NULL;
544                         break;
545                 case RPC_AUTH_UNIX:
546                         READ_BUF(8);
547                         /* stamp */
548                         dummy = be32_to_cpup(p++);
549
550                         /* machine name */
551                         dummy = be32_to_cpup(p++);
552                         READ_BUF(dummy);
553                         SAVEMEM(machine_name, dummy);
554
555                         /* uid, gid */
556                         READ_BUF(8);
557                         uid = be32_to_cpup(p++);
558                         gid = be32_to_cpup(p++);
559
560                         /* more gids */
561                         READ_BUF(4);
562                         dummy = be32_to_cpup(p++);
563                         READ_BUF(dummy * 4);
564                         if (cbs->flavor == (u32)(-1)) {
565                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
566                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
567                                 if (uid_valid(kuid) && gid_valid(kgid)) {
568                                         cbs->uid = kuid;
569                                         cbs->gid = kgid;
570                                         cbs->flavor = RPC_AUTH_UNIX;
571                                 } else {
572                                         dprintk("RPC_AUTH_UNIX with invalid"
573                                                 "uid or gid ignoring!\n");
574                                 }
575                         }
576                         break;
577                 case RPC_AUTH_GSS:
578                         dprintk("RPC_AUTH_GSS callback secflavor "
579                                 "not supported!\n");
580                         READ_BUF(8);
581                         /* gcbp_service */
582                         dummy = be32_to_cpup(p++);
583                         /* gcbp_handle_from_server */
584                         dummy = be32_to_cpup(p++);
585                         READ_BUF(dummy);
586                         p += XDR_QUADLEN(dummy);
587                         /* gcbp_handle_from_client */
588                         READ_BUF(4);
589                         dummy = be32_to_cpup(p++);
590                         READ_BUF(dummy);
591                         break;
592                 default:
593                         dprintk("Illegal callback secflavor\n");
594                         return nfserr_inval;
595                 }
596         }
597         DECODE_TAIL;
598 }
599
600 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
601 {
602         DECODE_HEAD;
603
604         READ_BUF(4);
605         bc->bc_cb_program = be32_to_cpup(p++);
606         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
607
608         DECODE_TAIL;
609 }
610
611 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
612 {
613         DECODE_HEAD;
614
615         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
616         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
617         bcts->dir = be32_to_cpup(p++);
618         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
619          * could help us figure out we should be using it. */
620         DECODE_TAIL;
621 }
622
623 static __be32
624 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
625 {
626         DECODE_HEAD;
627
628         READ_BUF(4);
629         close->cl_seqid = be32_to_cpup(p++);
630         return nfsd4_decode_stateid(argp, &close->cl_stateid);
631
632         DECODE_TAIL;
633 }
634
635
636 static __be32
637 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
638 {
639         DECODE_HEAD;
640
641         READ_BUF(12);
642         p = xdr_decode_hyper(p, &commit->co_offset);
643         commit->co_count = be32_to_cpup(p++);
644
645         DECODE_TAIL;
646 }
647
648 static __be32
649 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
650 {
651         DECODE_HEAD;
652
653         READ_BUF(4);
654         create->cr_type = be32_to_cpup(p++);
655         switch (create->cr_type) {
656         case NF4LNK:
657                 READ_BUF(4);
658                 create->cr_datalen = be32_to_cpup(p++);
659                 READ_BUF(create->cr_datalen);
660                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
661                 if (!create->cr_data)
662                         return nfserr_jukebox;
663                 break;
664         case NF4BLK:
665         case NF4CHR:
666                 READ_BUF(8);
667                 create->cr_specdata1 = be32_to_cpup(p++);
668                 create->cr_specdata2 = be32_to_cpup(p++);
669                 break;
670         case NF4SOCK:
671         case NF4FIFO:
672         case NF4DIR:
673         default:
674                 break;
675         }
676
677         READ_BUF(4);
678         create->cr_namelen = be32_to_cpup(p++);
679         READ_BUF(create->cr_namelen);
680         SAVEMEM(create->cr_name, create->cr_namelen);
681         if ((status = check_filename(create->cr_name, create->cr_namelen)))
682                 return status;
683
684         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
685                                     &create->cr_acl, &create->cr_label,
686                                     &current->fs->umask);
687         if (status)
688                 goto out;
689
690         DECODE_TAIL;
691 }
692
693 static inline __be32
694 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
695 {
696         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
697 }
698
699 static inline __be32
700 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
701 {
702         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
703 }
704
705 static __be32
706 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
707 {
708         DECODE_HEAD;
709
710         READ_BUF(4);
711         link->li_namelen = be32_to_cpup(p++);
712         READ_BUF(link->li_namelen);
713         SAVEMEM(link->li_name, link->li_namelen);
714         if ((status = check_filename(link->li_name, link->li_namelen)))
715                 return status;
716
717         DECODE_TAIL;
718 }
719
720 static __be32
721 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
722 {
723         DECODE_HEAD;
724
725         /*
726         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
727         */
728         READ_BUF(28);
729         lock->lk_type = be32_to_cpup(p++);
730         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
731                 goto xdr_error;
732         lock->lk_reclaim = be32_to_cpup(p++);
733         p = xdr_decode_hyper(p, &lock->lk_offset);
734         p = xdr_decode_hyper(p, &lock->lk_length);
735         lock->lk_is_new = be32_to_cpup(p++);
736
737         if (lock->lk_is_new) {
738                 READ_BUF(4);
739                 lock->lk_new_open_seqid = be32_to_cpup(p++);
740                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
741                 if (status)
742                         return status;
743                 READ_BUF(8 + sizeof(clientid_t));
744                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
745                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
746                 lock->lk_new_owner.len = be32_to_cpup(p++);
747                 READ_BUF(lock->lk_new_owner.len);
748                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
749         } else {
750                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
751                 if (status)
752                         return status;
753                 READ_BUF(4);
754                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
755         }
756
757         DECODE_TAIL;
758 }
759
760 static __be32
761 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
762 {
763         DECODE_HEAD;
764                         
765         READ_BUF(32);
766         lockt->lt_type = be32_to_cpup(p++);
767         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
768                 goto xdr_error;
769         p = xdr_decode_hyper(p, &lockt->lt_offset);
770         p = xdr_decode_hyper(p, &lockt->lt_length);
771         COPYMEM(&lockt->lt_clientid, 8);
772         lockt->lt_owner.len = be32_to_cpup(p++);
773         READ_BUF(lockt->lt_owner.len);
774         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
775
776         DECODE_TAIL;
777 }
778
779 static __be32
780 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
781 {
782         DECODE_HEAD;
783
784         READ_BUF(8);
785         locku->lu_type = be32_to_cpup(p++);
786         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
787                 goto xdr_error;
788         locku->lu_seqid = be32_to_cpup(p++);
789         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
790         if (status)
791                 return status;
792         READ_BUF(16);
793         p = xdr_decode_hyper(p, &locku->lu_offset);
794         p = xdr_decode_hyper(p, &locku->lu_length);
795
796         DECODE_TAIL;
797 }
798
799 static __be32
800 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
801 {
802         DECODE_HEAD;
803
804         READ_BUF(4);
805         lookup->lo_len = be32_to_cpup(p++);
806         READ_BUF(lookup->lo_len);
807         SAVEMEM(lookup->lo_name, lookup->lo_len);
808         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
809                 return status;
810
811         DECODE_TAIL;
812 }
813
814 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
815 {
816         __be32 *p;
817         u32 w;
818
819         READ_BUF(4);
820         w = be32_to_cpup(p++);
821         *share_access = w & NFS4_SHARE_ACCESS_MASK;
822         *deleg_want = w & NFS4_SHARE_WANT_MASK;
823         if (deleg_when)
824                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
825
826         switch (w & NFS4_SHARE_ACCESS_MASK) {
827         case NFS4_SHARE_ACCESS_READ:
828         case NFS4_SHARE_ACCESS_WRITE:
829         case NFS4_SHARE_ACCESS_BOTH:
830                 break;
831         default:
832                 return nfserr_bad_xdr;
833         }
834         w &= ~NFS4_SHARE_ACCESS_MASK;
835         if (!w)
836                 return nfs_ok;
837         if (!argp->minorversion)
838                 return nfserr_bad_xdr;
839         switch (w & NFS4_SHARE_WANT_MASK) {
840         case NFS4_SHARE_WANT_NO_PREFERENCE:
841         case NFS4_SHARE_WANT_READ_DELEG:
842         case NFS4_SHARE_WANT_WRITE_DELEG:
843         case NFS4_SHARE_WANT_ANY_DELEG:
844         case NFS4_SHARE_WANT_NO_DELEG:
845         case NFS4_SHARE_WANT_CANCEL:
846                 break;
847         default:
848                 return nfserr_bad_xdr;
849         }
850         w &= ~NFS4_SHARE_WANT_MASK;
851         if (!w)
852                 return nfs_ok;
853
854         if (!deleg_when)        /* open_downgrade */
855                 return nfserr_inval;
856         switch (w) {
857         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
858         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
859         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
860               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
861                 return nfs_ok;
862         }
863 xdr_error:
864         return nfserr_bad_xdr;
865 }
866
867 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
868 {
869         __be32 *p;
870
871         READ_BUF(4);
872         *x = be32_to_cpup(p++);
873         /* Note: unlinke access bits, deny bits may be zero. */
874         if (*x & ~NFS4_SHARE_DENY_BOTH)
875                 return nfserr_bad_xdr;
876         return nfs_ok;
877 xdr_error:
878         return nfserr_bad_xdr;
879 }
880
881 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
882 {
883         __be32 *p;
884
885         READ_BUF(4);
886         o->len = be32_to_cpup(p++);
887
888         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
889                 return nfserr_bad_xdr;
890
891         READ_BUF(o->len);
892         SAVEMEM(o->data, o->len);
893         return nfs_ok;
894 xdr_error:
895         return nfserr_bad_xdr;
896 }
897
898 static __be32
899 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
900 {
901         DECODE_HEAD;
902         u32 dummy;
903
904         memset(open->op_bmval, 0, sizeof(open->op_bmval));
905         open->op_iattr.ia_valid = 0;
906         open->op_openowner = NULL;
907
908         open->op_xdr_error = 0;
909         /* seqid, share_access, share_deny, clientid, ownerlen */
910         READ_BUF(4);
911         open->op_seqid = be32_to_cpup(p++);
912         /* decode, yet ignore deleg_when until supported */
913         status = nfsd4_decode_share_access(argp, &open->op_share_access,
914                                            &open->op_deleg_want, &dummy);
915         if (status)
916                 goto xdr_error;
917         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
918         if (status)
919                 goto xdr_error;
920         READ_BUF(sizeof(clientid_t));
921         COPYMEM(&open->op_clientid, sizeof(clientid_t));
922         status = nfsd4_decode_opaque(argp, &open->op_owner);
923         if (status)
924                 goto xdr_error;
925         READ_BUF(4);
926         open->op_create = be32_to_cpup(p++);
927         switch (open->op_create) {
928         case NFS4_OPEN_NOCREATE:
929                 break;
930         case NFS4_OPEN_CREATE:
931                 current->fs->umask = 0;
932                 READ_BUF(4);
933                 open->op_createmode = be32_to_cpup(p++);
934                 switch (open->op_createmode) {
935                 case NFS4_CREATE_UNCHECKED:
936                 case NFS4_CREATE_GUARDED:
937                         status = nfsd4_decode_fattr(argp, open->op_bmval,
938                                 &open->op_iattr, &open->op_acl, &open->op_label,
939                                 &current->fs->umask);
940                         if (status)
941                                 goto out;
942                         break;
943                 case NFS4_CREATE_EXCLUSIVE:
944                         READ_BUF(NFS4_VERIFIER_SIZE);
945                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
946                         break;
947                 case NFS4_CREATE_EXCLUSIVE4_1:
948                         if (argp->minorversion < 1)
949                                 goto xdr_error;
950                         READ_BUF(NFS4_VERIFIER_SIZE);
951                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
952                         status = nfsd4_decode_fattr(argp, open->op_bmval,
953                                 &open->op_iattr, &open->op_acl, &open->op_label,
954                                 &current->fs->umask);
955                         if (status)
956                                 goto out;
957                         break;
958                 default:
959                         goto xdr_error;
960                 }
961                 break;
962         default:
963                 goto xdr_error;
964         }
965
966         /* open_claim */
967         READ_BUF(4);
968         open->op_claim_type = be32_to_cpup(p++);
969         switch (open->op_claim_type) {
970         case NFS4_OPEN_CLAIM_NULL:
971         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
972                 READ_BUF(4);
973                 open->op_fname.len = be32_to_cpup(p++);
974                 READ_BUF(open->op_fname.len);
975                 SAVEMEM(open->op_fname.data, open->op_fname.len);
976                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
977                         return status;
978                 break;
979         case NFS4_OPEN_CLAIM_PREVIOUS:
980                 READ_BUF(4);
981                 open->op_delegate_type = be32_to_cpup(p++);
982                 break;
983         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
984                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
985                 if (status)
986                         return status;
987                 READ_BUF(4);
988                 open->op_fname.len = be32_to_cpup(p++);
989                 READ_BUF(open->op_fname.len);
990                 SAVEMEM(open->op_fname.data, open->op_fname.len);
991                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
992                         return status;
993                 break;
994         case NFS4_OPEN_CLAIM_FH:
995         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
996                 if (argp->minorversion < 1)
997                         goto xdr_error;
998                 /* void */
999                 break;
1000         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1001                 if (argp->minorversion < 1)
1002                         goto xdr_error;
1003                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1004                 if (status)
1005                         return status;
1006                 break;
1007         default:
1008                 goto xdr_error;
1009         }
1010
1011         DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1016 {
1017         DECODE_HEAD;
1018
1019         if (argp->minorversion >= 1)
1020                 return nfserr_notsupp;
1021
1022         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1023         if (status)
1024                 return status;
1025         READ_BUF(4);
1026         open_conf->oc_seqid = be32_to_cpup(p++);
1027
1028         DECODE_TAIL;
1029 }
1030
1031 static __be32
1032 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1033 {
1034         DECODE_HEAD;
1035                     
1036         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1037         if (status)
1038                 return status;
1039         READ_BUF(4);
1040         open_down->od_seqid = be32_to_cpup(p++);
1041         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1042                                            &open_down->od_deleg_want, NULL);
1043         if (status)
1044                 return status;
1045         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1046         if (status)
1047                 return status;
1048         DECODE_TAIL;
1049 }
1050
1051 static __be32
1052 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1053 {
1054         DECODE_HEAD;
1055
1056         READ_BUF(4);
1057         putfh->pf_fhlen = be32_to_cpup(p++);
1058         if (putfh->pf_fhlen > NFS4_FHSIZE)
1059                 goto xdr_error;
1060         READ_BUF(putfh->pf_fhlen);
1061         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1062
1063         DECODE_TAIL;
1064 }
1065
1066 static __be32
1067 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1068 {
1069         if (argp->minorversion == 0)
1070                 return nfs_ok;
1071         return nfserr_notsupp;
1072 }
1073
1074 static __be32
1075 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1076 {
1077         DECODE_HEAD;
1078
1079         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1080         if (status)
1081                 return status;
1082         READ_BUF(12);
1083         p = xdr_decode_hyper(p, &read->rd_offset);
1084         read->rd_length = be32_to_cpup(p++);
1085
1086         DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1091 {
1092         DECODE_HEAD;
1093
1094         READ_BUF(24);
1095         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1096         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1097         readdir->rd_dircount = be32_to_cpup(p++);
1098         readdir->rd_maxcount = be32_to_cpup(p++);
1099         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1100                 goto out;
1101
1102         DECODE_TAIL;
1103 }
1104
1105 static __be32
1106 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1107 {
1108         DECODE_HEAD;
1109
1110         READ_BUF(4);
1111         remove->rm_namelen = be32_to_cpup(p++);
1112         READ_BUF(remove->rm_namelen);
1113         SAVEMEM(remove->rm_name, remove->rm_namelen);
1114         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1115                 return status;
1116
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1122 {
1123         DECODE_HEAD;
1124
1125         READ_BUF(4);
1126         rename->rn_snamelen = be32_to_cpup(p++);
1127         READ_BUF(rename->rn_snamelen);
1128         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1129         READ_BUF(4);
1130         rename->rn_tnamelen = be32_to_cpup(p++);
1131         READ_BUF(rename->rn_tnamelen);
1132         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1133         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1134                 return status;
1135         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1136                 return status;
1137
1138         DECODE_TAIL;
1139 }
1140
1141 static __be32
1142 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1143 {
1144         DECODE_HEAD;
1145
1146         if (argp->minorversion >= 1)
1147                 return nfserr_notsupp;
1148
1149         READ_BUF(sizeof(clientid_t));
1150         COPYMEM(clientid, sizeof(clientid_t));
1151
1152         DECODE_TAIL;
1153 }
1154
1155 static __be32
1156 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1157                      struct nfsd4_secinfo *secinfo)
1158 {
1159         DECODE_HEAD;
1160
1161         READ_BUF(4);
1162         secinfo->si_namelen = be32_to_cpup(p++);
1163         READ_BUF(secinfo->si_namelen);
1164         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1165         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1166         if (status)
1167                 return status;
1168         DECODE_TAIL;
1169 }
1170
1171 static __be32
1172 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1173                      struct nfsd4_secinfo_no_name *sin)
1174 {
1175         DECODE_HEAD;
1176
1177         READ_BUF(4);
1178         sin->sin_style = be32_to_cpup(p++);
1179         DECODE_TAIL;
1180 }
1181
1182 static __be32
1183 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1184 {
1185         __be32 status;
1186
1187         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1188         if (status)
1189                 return status;
1190         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1191                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1192 }
1193
1194 static __be32
1195 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1196 {
1197         DECODE_HEAD;
1198
1199         if (argp->minorversion >= 1)
1200                 return nfserr_notsupp;
1201
1202         READ_BUF(NFS4_VERIFIER_SIZE);
1203         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1204
1205         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1206         if (status)
1207                 return nfserr_bad_xdr;
1208         READ_BUF(8);
1209         setclientid->se_callback_prog = be32_to_cpup(p++);
1210         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1211         READ_BUF(setclientid->se_callback_netid_len);
1212         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1213         READ_BUF(4);
1214         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1215
1216         READ_BUF(setclientid->se_callback_addr_len);
1217         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1218         READ_BUF(4);
1219         setclientid->se_callback_ident = be32_to_cpup(p++);
1220
1221         DECODE_TAIL;
1222 }
1223
1224 static __be32
1225 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1226 {
1227         DECODE_HEAD;
1228
1229         if (argp->minorversion >= 1)
1230                 return nfserr_notsupp;
1231
1232         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1233         COPYMEM(&scd_c->sc_clientid, 8);
1234         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1235
1236         DECODE_TAIL;
1237 }
1238
1239 /* Also used for NVERIFY */
1240 static __be32
1241 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1242 {
1243         DECODE_HEAD;
1244
1245         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1246                 goto out;
1247
1248         /* For convenience's sake, we compare raw xdr'd attributes in
1249          * nfsd4_proc_verify */
1250
1251         READ_BUF(4);
1252         verify->ve_attrlen = be32_to_cpup(p++);
1253         READ_BUF(verify->ve_attrlen);
1254         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1255
1256         DECODE_TAIL;
1257 }
1258
1259 static __be32
1260 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1261 {
1262         int avail;
1263         int len;
1264         DECODE_HEAD;
1265
1266         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1267         if (status)
1268                 return status;
1269         READ_BUF(16);
1270         p = xdr_decode_hyper(p, &write->wr_offset);
1271         write->wr_stable_how = be32_to_cpup(p++);
1272         if (write->wr_stable_how > NFS_FILE_SYNC)
1273                 goto xdr_error;
1274         write->wr_buflen = be32_to_cpup(p++);
1275
1276         /* Sorry .. no magic macros for this.. *
1277          * READ_BUF(write->wr_buflen);
1278          * SAVEMEM(write->wr_buf, write->wr_buflen);
1279          */
1280         avail = (char*)argp->end - (char*)argp->p;
1281         if (avail + argp->pagelen < write->wr_buflen) {
1282                 dprintk("NFSD: xdr error (%s:%d)\n",
1283                                 __FILE__, __LINE__);
1284                 goto xdr_error;
1285         }
1286         write->wr_head.iov_base = p;
1287         write->wr_head.iov_len = avail;
1288         write->wr_pagelist = argp->pagelist;
1289
1290         len = XDR_QUADLEN(write->wr_buflen) << 2;
1291         if (len >= avail) {
1292                 int pages;
1293
1294                 len -= avail;
1295
1296                 pages = len >> PAGE_SHIFT;
1297                 argp->pagelist += pages;
1298                 argp->pagelen -= pages * PAGE_SIZE;
1299                 len -= pages * PAGE_SIZE;
1300
1301                 next_decode_page(argp);
1302         }
1303         argp->p += XDR_QUADLEN(len);
1304
1305         DECODE_TAIL;
1306 }
1307
1308 static __be32
1309 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1310 {
1311         DECODE_HEAD;
1312
1313         if (argp->minorversion >= 1)
1314                 return nfserr_notsupp;
1315
1316         READ_BUF(12);
1317         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1318         rlockowner->rl_owner.len = be32_to_cpup(p++);
1319         READ_BUF(rlockowner->rl_owner.len);
1320         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1321
1322         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1323                 return nfserr_inval;
1324         DECODE_TAIL;
1325 }
1326
1327 static __be32
1328 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1329                          struct nfsd4_exchange_id *exid)
1330 {
1331         int dummy, tmp;
1332         DECODE_HEAD;
1333
1334         READ_BUF(NFS4_VERIFIER_SIZE);
1335         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1336
1337         status = nfsd4_decode_opaque(argp, &exid->clname);
1338         if (status)
1339                 return nfserr_bad_xdr;
1340
1341         READ_BUF(4);
1342         exid->flags = be32_to_cpup(p++);
1343
1344         /* Ignore state_protect4_a */
1345         READ_BUF(4);
1346         exid->spa_how = be32_to_cpup(p++);
1347         switch (exid->spa_how) {
1348         case SP4_NONE:
1349                 break;
1350         case SP4_MACH_CRED:
1351                 /* spo_must_enforce */
1352                 status = nfsd4_decode_bitmap(argp,
1353                                         exid->spo_must_enforce);
1354                 if (status)
1355                         goto out;
1356                 /* spo_must_allow */
1357                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1358                 if (status)
1359                         goto out;
1360                 break;
1361         case SP4_SSV:
1362                 /* ssp_ops */
1363                 READ_BUF(4);
1364                 dummy = be32_to_cpup(p++);
1365                 READ_BUF(dummy * 4);
1366                 p += dummy;
1367
1368                 READ_BUF(4);
1369                 dummy = be32_to_cpup(p++);
1370                 READ_BUF(dummy * 4);
1371                 p += dummy;
1372
1373                 /* ssp_hash_algs<> */
1374                 READ_BUF(4);
1375                 tmp = be32_to_cpup(p++);
1376                 while (tmp--) {
1377                         READ_BUF(4);
1378                         dummy = be32_to_cpup(p++);
1379                         READ_BUF(dummy);
1380                         p += XDR_QUADLEN(dummy);
1381                 }
1382
1383                 /* ssp_encr_algs<> */
1384                 READ_BUF(4);
1385                 tmp = be32_to_cpup(p++);
1386                 while (tmp--) {
1387                         READ_BUF(4);
1388                         dummy = be32_to_cpup(p++);
1389                         READ_BUF(dummy);
1390                         p += XDR_QUADLEN(dummy);
1391                 }
1392
1393                 /* ssp_window and ssp_num_gss_handles */
1394                 READ_BUF(8);
1395                 dummy = be32_to_cpup(p++);
1396                 dummy = be32_to_cpup(p++);
1397                 break;
1398         default:
1399                 goto xdr_error;
1400         }
1401
1402         /* Ignore Implementation ID */
1403         READ_BUF(4);    /* nfs_impl_id4 array length */
1404         dummy = be32_to_cpup(p++);
1405
1406         if (dummy > 1)
1407                 goto xdr_error;
1408
1409         if (dummy == 1) {
1410                 /* nii_domain */
1411                 READ_BUF(4);
1412                 dummy = be32_to_cpup(p++);
1413                 READ_BUF(dummy);
1414                 p += XDR_QUADLEN(dummy);
1415
1416                 /* nii_name */
1417                 READ_BUF(4);
1418                 dummy = be32_to_cpup(p++);
1419                 READ_BUF(dummy);
1420                 p += XDR_QUADLEN(dummy);
1421
1422                 /* nii_date */
1423                 READ_BUF(12);
1424                 p += 3;
1425         }
1426         DECODE_TAIL;
1427 }
1428
1429 static __be32
1430 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1431                             struct nfsd4_create_session *sess)
1432 {
1433         DECODE_HEAD;
1434         u32 dummy;
1435
1436         READ_BUF(16);
1437         COPYMEM(&sess->clientid, 8);
1438         sess->seqid = be32_to_cpup(p++);
1439         sess->flags = be32_to_cpup(p++);
1440
1441         /* Fore channel attrs */
1442         READ_BUF(28);
1443         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1444         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1445         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1446         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1447         sess->fore_channel.maxops = be32_to_cpup(p++);
1448         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1449         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1450         if (sess->fore_channel.nr_rdma_attrs == 1) {
1451                 READ_BUF(4);
1452                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1453         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1454                 dprintk("Too many fore channel attr bitmaps!\n");
1455                 goto xdr_error;
1456         }
1457
1458         /* Back channel attrs */
1459         READ_BUF(28);
1460         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1461         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1462         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1463         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1464         sess->back_channel.maxops = be32_to_cpup(p++);
1465         sess->back_channel.maxreqs = be32_to_cpup(p++);
1466         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1467         if (sess->back_channel.nr_rdma_attrs == 1) {
1468                 READ_BUF(4);
1469                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1470         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1471                 dprintk("Too many back channel attr bitmaps!\n");
1472                 goto xdr_error;
1473         }
1474
1475         READ_BUF(4);
1476         sess->callback_prog = be32_to_cpup(p++);
1477         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1478         DECODE_TAIL;
1479 }
1480
1481 static __be32
1482 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1483                              struct nfsd4_destroy_session *destroy_session)
1484 {
1485         DECODE_HEAD;
1486         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1487         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1488
1489         DECODE_TAIL;
1490 }
1491
1492 static __be32
1493 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1494                           struct nfsd4_free_stateid *free_stateid)
1495 {
1496         DECODE_HEAD;
1497
1498         READ_BUF(sizeof(stateid_t));
1499         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1500         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1501
1502         DECODE_TAIL;
1503 }
1504
1505 static __be32
1506 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1507                       struct nfsd4_sequence *seq)
1508 {
1509         DECODE_HEAD;
1510
1511         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1512         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1513         seq->seqid = be32_to_cpup(p++);
1514         seq->slotid = be32_to_cpup(p++);
1515         seq->maxslots = be32_to_cpup(p++);
1516         seq->cachethis = be32_to_cpup(p++);
1517
1518         DECODE_TAIL;
1519 }
1520
1521 static __be32
1522 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1523 {
1524         int i;
1525         __be32 *p, status;
1526         struct nfsd4_test_stateid_id *stateid;
1527
1528         READ_BUF(4);
1529         test_stateid->ts_num_ids = ntohl(*p++);
1530
1531         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1532
1533         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1534                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1535                 if (!stateid) {
1536                         status = nfserrno(-ENOMEM);
1537                         goto out;
1538                 }
1539
1540                 INIT_LIST_HEAD(&stateid->ts_id_list);
1541                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1542
1543                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1544                 if (status)
1545                         goto out;
1546         }
1547
1548         status = 0;
1549 out:
1550         return status;
1551 xdr_error:
1552         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1553         status = nfserr_bad_xdr;
1554         goto out;
1555 }
1556
1557 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1558 {
1559         DECODE_HEAD;
1560
1561         READ_BUF(8);
1562         COPYMEM(&dc->clientid, 8);
1563
1564         DECODE_TAIL;
1565 }
1566
1567 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1568 {
1569         DECODE_HEAD;
1570
1571         READ_BUF(4);
1572         rc->rca_one_fs = be32_to_cpup(p++);
1573
1574         DECODE_TAIL;
1575 }
1576
1577 #ifdef CONFIG_NFSD_PNFS
1578 static __be32
1579 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1580                 struct nfsd4_getdeviceinfo *gdev)
1581 {
1582         DECODE_HEAD;
1583         u32 num, i;
1584
1585         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1586         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1587         gdev->gd_layout_type = be32_to_cpup(p++);
1588         gdev->gd_maxcount = be32_to_cpup(p++);
1589         num = be32_to_cpup(p++);
1590         if (num) {
1591                 READ_BUF(4 * num);
1592                 gdev->gd_notify_types = be32_to_cpup(p++);
1593                 for (i = 1; i < num; i++) {
1594                         if (be32_to_cpup(p++)) {
1595                                 status = nfserr_inval;
1596                                 goto out;
1597                         }
1598                 }
1599         }
1600         DECODE_TAIL;
1601 }
1602
1603 static __be32
1604 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1605                 struct nfsd4_layoutget *lgp)
1606 {
1607         DECODE_HEAD;
1608
1609         READ_BUF(36);
1610         lgp->lg_signal = be32_to_cpup(p++);
1611         lgp->lg_layout_type = be32_to_cpup(p++);
1612         lgp->lg_seg.iomode = be32_to_cpup(p++);
1613         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1614         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1615         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1616
1617         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1618         if (status)
1619                 return status;
1620
1621         READ_BUF(4);
1622         lgp->lg_maxcount = be32_to_cpup(p++);
1623
1624         DECODE_TAIL;
1625 }
1626
1627 static __be32
1628 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1629                 struct nfsd4_layoutcommit *lcp)
1630 {
1631         DECODE_HEAD;
1632         u32 timechange;
1633
1634         READ_BUF(20);
1635         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1636         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1637         lcp->lc_reclaim = be32_to_cpup(p++);
1638
1639         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1640         if (status)
1641                 return status;
1642
1643         READ_BUF(4);
1644         lcp->lc_newoffset = be32_to_cpup(p++);
1645         if (lcp->lc_newoffset) {
1646                 READ_BUF(8);
1647                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1648         } else
1649                 lcp->lc_last_wr = 0;
1650         READ_BUF(4);
1651         timechange = be32_to_cpup(p++);
1652         if (timechange) {
1653                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1654                 if (status)
1655                         return status;
1656         } else {
1657                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1658         }
1659         READ_BUF(8);
1660         lcp->lc_layout_type = be32_to_cpup(p++);
1661
1662         /*
1663          * Save the layout update in XDR format and let the layout driver deal
1664          * with it later.
1665          */
1666         lcp->lc_up_len = be32_to_cpup(p++);
1667         if (lcp->lc_up_len > 0) {
1668                 READ_BUF(lcp->lc_up_len);
1669                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1670         }
1671
1672         DECODE_TAIL;
1673 }
1674
1675 static __be32
1676 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1677                 struct nfsd4_layoutreturn *lrp)
1678 {
1679         DECODE_HEAD;
1680
1681         READ_BUF(16);
1682         lrp->lr_reclaim = be32_to_cpup(p++);
1683         lrp->lr_layout_type = be32_to_cpup(p++);
1684         lrp->lr_seg.iomode = be32_to_cpup(p++);
1685         lrp->lr_return_type = be32_to_cpup(p++);
1686         if (lrp->lr_return_type == RETURN_FILE) {
1687                 READ_BUF(16);
1688                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1689                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1690
1691                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1692                 if (status)
1693                         return status;
1694
1695                 READ_BUF(4);
1696                 lrp->lrf_body_len = be32_to_cpup(p++);
1697                 if (lrp->lrf_body_len > 0) {
1698                         READ_BUF(lrp->lrf_body_len);
1699                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1700                 }
1701         } else {
1702                 lrp->lr_seg.offset = 0;
1703                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1704         }
1705
1706         DECODE_TAIL;
1707 }
1708 #endif /* CONFIG_NFSD_PNFS */
1709
1710 static __be32
1711 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1712                        struct nfsd4_fallocate *fallocate)
1713 {
1714         DECODE_HEAD;
1715
1716         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1717         if (status)
1718                 return status;
1719
1720         READ_BUF(16);
1721         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1722         xdr_decode_hyper(p, &fallocate->falloc_length);
1723
1724         DECODE_TAIL;
1725 }
1726
1727 static __be32
1728 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1729 {
1730         DECODE_HEAD;
1731
1732         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1733         if (status)
1734                 return status;
1735         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1736         if (status)
1737                 return status;
1738
1739         READ_BUF(8 + 8 + 8);
1740         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1741         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1742         p = xdr_decode_hyper(p, &clone->cl_count);
1743         DECODE_TAIL;
1744 }
1745
1746 static __be32
1747 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1748 {
1749         DECODE_HEAD;
1750         unsigned int tmp;
1751
1752         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1753         if (status)
1754                 return status;
1755         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1756         if (status)
1757                 return status;
1758
1759         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1760         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1761         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1762         p = xdr_decode_hyper(p, &copy->cp_count);
1763         copy->cp_consecutive = be32_to_cpup(p++);
1764         copy->cp_synchronous = be32_to_cpup(p++);
1765         tmp = be32_to_cpup(p); /* Source server list not supported */
1766
1767         DECODE_TAIL;
1768 }
1769
1770 static __be32
1771 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1772 {
1773         DECODE_HEAD;
1774
1775         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1776         if (status)
1777                 return status;
1778
1779         READ_BUF(8 + 4);
1780         p = xdr_decode_hyper(p, &seek->seek_offset);
1781         seek->seek_whence = be32_to_cpup(p);
1782
1783         DECODE_TAIL;
1784 }
1785
1786 static __be32
1787 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1788 {
1789         return nfs_ok;
1790 }
1791
1792 static __be32
1793 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1794 {
1795         return nfserr_notsupp;
1796 }
1797
1798 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1799
1800 static const nfsd4_dec nfsd4_dec_ops[] = {
1801         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1802         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1803         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1804         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1805         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1806         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1807         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1808         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1809         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1810         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1811         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1812         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1813         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1814         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1815         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1816         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1817         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1818         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1819         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1820         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1821         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1822         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1823         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1824         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1825         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1826         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1827         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1828         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1829         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1830         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1831         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1832         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1833         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1834         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1835         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1836         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1837         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1838
1839         /* new operations for NFSv4.1 */
1840         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1841         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1842         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1843         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1844         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1845         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1846         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1847 #ifdef CONFIG_NFSD_PNFS
1848         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1849         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1850         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1851         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1852         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1853 #else
1854         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1856         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1859 #endif
1860         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1861         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1862         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1863         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1864         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1865         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1866         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1867
1868         /* new operations for NFSv4.2 */
1869         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1870         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1871         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1872         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1873         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1874         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1875         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1876         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1877         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1878         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1879         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1880         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1881         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1882 };
1883
1884 static inline bool
1885 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1886 {
1887         if (op->opnum < FIRST_NFS4_OP)
1888                 return false;
1889         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1890                 return false;
1891         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1892                 return false;
1893         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1894                 return false;
1895         return true;
1896 }
1897
1898 static __be32
1899 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1900 {
1901         DECODE_HEAD;
1902         struct nfsd4_op *op;
1903         bool cachethis = false;
1904         int auth_slack= argp->rqstp->rq_auth_slack;
1905         int max_reply = auth_slack + 8; /* opcnt, status */
1906         int readcount = 0;
1907         int readbytes = 0;
1908         int i;
1909
1910         READ_BUF(4);
1911         argp->taglen = be32_to_cpup(p++);
1912         READ_BUF(argp->taglen);
1913         SAVEMEM(argp->tag, argp->taglen);
1914         READ_BUF(8);
1915         argp->minorversion = be32_to_cpup(p++);
1916         argp->opcnt = be32_to_cpup(p++);
1917         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1918
1919         if (argp->taglen > NFSD4_MAX_TAGLEN)
1920                 goto xdr_error;
1921         if (argp->opcnt > 100)
1922                 goto xdr_error;
1923
1924         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1925                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1926                 if (!argp->ops) {
1927                         argp->ops = argp->iops;
1928                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1929                         goto xdr_error;
1930                 }
1931         }
1932
1933         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1934                 argp->opcnt = 0;
1935
1936         for (i = 0; i < argp->opcnt; i++) {
1937                 op = &argp->ops[i];
1938                 op->replay = NULL;
1939
1940                 READ_BUF(4);
1941                 op->opnum = be32_to_cpup(p++);
1942
1943                 if (nfsd4_opnum_in_range(argp, op))
1944                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1945                 else {
1946                         op->opnum = OP_ILLEGAL;
1947                         op->status = nfserr_op_illegal;
1948                 }
1949                 op->opdesc = OPDESC(op);
1950                 /*
1951                  * We'll try to cache the result in the DRC if any one
1952                  * op in the compound wants to be cached:
1953                  */
1954                 cachethis |= nfsd4_cache_this_op(op);
1955
1956                 if (op->opnum == OP_READ) {
1957                         readcount++;
1958                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1959                 } else
1960                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1961                 /*
1962                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1963                  * (Special case because it will just skip encoding this
1964                  * if it runs out of xdr buffer space, and it is the only
1965                  * operation that behaves this way.)
1966                  */
1967                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1968                         max_reply += NFS4_OPAQUE_LIMIT;
1969
1970                 if (op->status) {
1971                         argp->opcnt = i+1;
1972                         break;
1973                 }
1974         }
1975         /* Sessions make the DRC unnecessary: */
1976         if (argp->minorversion)
1977                 cachethis = false;
1978         svc_reserve(argp->rqstp, max_reply + readbytes);
1979         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1980
1981         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1982                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1983
1984         DECODE_TAIL;
1985 }
1986
1987 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1988                              struct svc_export *exp)
1989 {
1990         if (exp->ex_flags & NFSEXP_V4ROOT) {
1991                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1992                 *p++ = 0;
1993         } else if (IS_I_VERSION(inode)) {
1994                 p = xdr_encode_hyper(p, nfsd4_change_attribute(inode));
1995         } else {
1996                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1997                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1998         }
1999         return p;
2000 }
2001
2002 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2003 {
2004         *p++ = cpu_to_be32(c->atomic);
2005         if (c->change_supported) {
2006                 p = xdr_encode_hyper(p, c->before_change);
2007                 p = xdr_encode_hyper(p, c->after_change);
2008         } else {
2009                 *p++ = cpu_to_be32(c->before_ctime_sec);
2010                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2011                 *p++ = cpu_to_be32(c->after_ctime_sec);
2012                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2013         }
2014         return p;
2015 }
2016
2017 /* Encode as an array of strings the string given with components
2018  * separated @sep, escaped with esc_enter and esc_exit.
2019  */
2020 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2021                                           char *components, char esc_enter,
2022                                           char esc_exit)
2023 {
2024         __be32 *p;
2025         __be32 pathlen;
2026         int pathlen_offset;
2027         int strlen, count=0;
2028         char *str, *end, *next;
2029
2030         dprintk("nfsd4_encode_components(%s)\n", components);
2031
2032         pathlen_offset = xdr->buf->len;
2033         p = xdr_reserve_space(xdr, 4);
2034         if (!p)
2035                 return nfserr_resource;
2036         p++; /* We will fill this in with @count later */
2037
2038         end = str = components;
2039         while (*end) {
2040                 bool found_esc = false;
2041
2042                 /* try to parse as esc_start, ..., esc_end, sep */
2043                 if (*str == esc_enter) {
2044                         for (; *end && (*end != esc_exit); end++)
2045                                 /* find esc_exit or end of string */;
2046                         next = end + 1;
2047                         if (*end && (!*next || *next == sep)) {
2048                                 str++;
2049                                 found_esc = true;
2050                         }
2051                 }
2052
2053                 if (!found_esc)
2054                         for (; *end && (*end != sep); end++)
2055                                 /* find sep or end of string */;
2056
2057                 strlen = end - str;
2058                 if (strlen) {
2059                         p = xdr_reserve_space(xdr, strlen + 4);
2060                         if (!p)
2061                                 return nfserr_resource;
2062                         p = xdr_encode_opaque(p, str, strlen);
2063                         count++;
2064                 }
2065                 else
2066                         end++;
2067                 if (found_esc)
2068                         end = next;
2069
2070                 str = end;
2071         }
2072         pathlen = htonl(count);
2073         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2074         return 0;
2075 }
2076
2077 /* Encode as an array of strings the string given with components
2078  * separated @sep.
2079  */
2080 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2081                                       char *components)
2082 {
2083         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2084 }
2085
2086 /*
2087  * encode a location element of a fs_locations structure
2088  */
2089 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2090                                         struct nfsd4_fs_location *location)
2091 {
2092         __be32 status;
2093
2094         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2095                                                 '[', ']');
2096         if (status)
2097                 return status;
2098         status = nfsd4_encode_components(xdr, '/', location->path);
2099         if (status)
2100                 return status;
2101         return 0;
2102 }
2103
2104 /*
2105  * Encode a path in RFC3530 'pathname4' format
2106  */
2107 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2108                                 const struct path *root,
2109                                 const struct path *path)
2110 {
2111         struct path cur = *path;
2112         __be32 *p;
2113         struct dentry **components = NULL;
2114         unsigned int ncomponents = 0;
2115         __be32 err = nfserr_jukebox;
2116
2117         dprintk("nfsd4_encode_components(");
2118
2119         path_get(&cur);
2120         /* First walk the path up to the nfsd root, and store the
2121          * dentries/path components in an array.
2122          */
2123         for (;;) {
2124                 if (path_equal(&cur, root))
2125                         break;
2126                 if (cur.dentry == cur.mnt->mnt_root) {
2127                         if (follow_up(&cur))
2128                                 continue;
2129                         goto out_free;
2130                 }
2131                 if ((ncomponents & 15) == 0) {
2132                         struct dentry **new;
2133                         new = krealloc(components,
2134                                         sizeof(*new) * (ncomponents + 16),
2135                                         GFP_KERNEL);
2136                         if (!new)
2137                                 goto out_free;
2138                         components = new;
2139                 }
2140                 components[ncomponents++] = cur.dentry;
2141                 cur.dentry = dget_parent(cur.dentry);
2142         }
2143         err = nfserr_resource;
2144         p = xdr_reserve_space(xdr, 4);
2145         if (!p)
2146                 goto out_free;
2147         *p++ = cpu_to_be32(ncomponents);
2148
2149         while (ncomponents) {
2150                 struct dentry *dentry = components[ncomponents - 1];
2151                 unsigned int len;
2152
2153                 spin_lock(&dentry->d_lock);
2154                 len = dentry->d_name.len;
2155                 p = xdr_reserve_space(xdr, len + 4);
2156                 if (!p) {
2157                         spin_unlock(&dentry->d_lock);
2158                         goto out_free;
2159                 }
2160                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2161                 dprintk("/%pd", dentry);
2162                 spin_unlock(&dentry->d_lock);
2163                 dput(dentry);
2164                 ncomponents--;
2165         }
2166
2167         err = 0;
2168 out_free:
2169         dprintk(")\n");
2170         while (ncomponents)
2171                 dput(components[--ncomponents]);
2172         kfree(components);
2173         path_put(&cur);
2174         return err;
2175 }
2176
2177 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2178                         struct svc_rqst *rqstp, const struct path *path)
2179 {
2180         struct svc_export *exp_ps;
2181         __be32 res;
2182
2183         exp_ps = rqst_find_fsidzero_export(rqstp);
2184         if (IS_ERR(exp_ps))
2185                 return nfserrno(PTR_ERR(exp_ps));
2186         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2187         exp_put(exp_ps);
2188         return res;
2189 }
2190
2191 /*
2192  *  encode a fs_locations structure
2193  */
2194 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2195                         struct svc_rqst *rqstp, struct svc_export *exp)
2196 {
2197         __be32 status;
2198         int i;
2199         __be32 *p;
2200         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2201
2202         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2203         if (status)
2204                 return status;
2205         p = xdr_reserve_space(xdr, 4);
2206         if (!p)
2207                 return nfserr_resource;
2208         *p++ = cpu_to_be32(fslocs->locations_count);
2209         for (i=0; i<fslocs->locations_count; i++) {
2210                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2211                 if (status)
2212                         return status;
2213         }
2214         return 0;
2215 }
2216
2217 static u32 nfs4_file_type(umode_t mode)
2218 {
2219         switch (mode & S_IFMT) {
2220         case S_IFIFO:   return NF4FIFO;
2221         case S_IFCHR:   return NF4CHR;
2222         case S_IFDIR:   return NF4DIR;
2223         case S_IFBLK:   return NF4BLK;
2224         case S_IFLNK:   return NF4LNK;
2225         case S_IFREG:   return NF4REG;
2226         case S_IFSOCK:  return NF4SOCK;
2227         default:        return NF4BAD;
2228         };
2229 }
2230
2231 static inline __be32
2232 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2233                      struct nfs4_ace *ace)
2234 {
2235         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2236                 return nfs4_acl_write_who(xdr, ace->whotype);
2237         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2238                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2239         else
2240                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2241 }
2242
2243 static inline __be32
2244 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2245 {
2246         __be32          *p;
2247         unsigned long   i = hweight_long(layout_types);
2248
2249         p = xdr_reserve_space(xdr, 4 + 4 * i);
2250         if (!p)
2251                 return nfserr_resource;
2252
2253         *p++ = cpu_to_be32(i);
2254
2255         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2256                 if (layout_types & (1 << i))
2257                         *p++ = cpu_to_be32(i);
2258
2259         return 0;
2260 }
2261
2262 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2263                               FATTR4_WORD0_RDATTR_ERROR)
2264 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2265 #define WORD2_ABSENT_FS_ATTRS 0
2266
2267 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2268 static inline __be32
2269 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2270                             void *context, int len)
2271 {
2272         __be32 *p;
2273
2274         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2275         if (!p)
2276                 return nfserr_resource;
2277
2278         /*
2279          * For now we use a 0 here to indicate the null translation; in
2280          * the future we may place a call to translation code here.
2281          */
2282         *p++ = cpu_to_be32(0); /* lfs */
2283         *p++ = cpu_to_be32(0); /* pi */
2284         p = xdr_encode_opaque(p, context, len);
2285         return 0;
2286 }
2287 #else
2288 static inline __be32
2289 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2290                             void *context, int len)
2291 { return 0; }
2292 #endif
2293
2294 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2295 {
2296         /* As per referral draft:  */
2297         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2298             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2299                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2300                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2301                         *rdattr_err = NFSERR_MOVED;
2302                 else
2303                         return nfserr_moved;
2304         }
2305         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2306         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2307         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2308         return 0;
2309 }
2310
2311
2312 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2313 {
2314         struct path path = exp->ex_path;
2315         int err;
2316
2317         path_get(&path);
2318         while (follow_up(&path)) {
2319                 if (path.dentry != path.mnt->mnt_root)
2320                         break;
2321         }
2322         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2323         path_put(&path);
2324         return err;
2325 }
2326
2327 static __be32
2328 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2329 {
2330         __be32 *p;
2331
2332         if (bmval2) {
2333                 p = xdr_reserve_space(xdr, 16);
2334                 if (!p)
2335                         goto out_resource;
2336                 *p++ = cpu_to_be32(3);
2337                 *p++ = cpu_to_be32(bmval0);
2338                 *p++ = cpu_to_be32(bmval1);
2339                 *p++ = cpu_to_be32(bmval2);
2340         } else if (bmval1) {
2341                 p = xdr_reserve_space(xdr, 12);
2342                 if (!p)
2343                         goto out_resource;
2344                 *p++ = cpu_to_be32(2);
2345                 *p++ = cpu_to_be32(bmval0);
2346                 *p++ = cpu_to_be32(bmval1);
2347         } else {
2348                 p = xdr_reserve_space(xdr, 8);
2349                 if (!p)
2350                         goto out_resource;
2351                 *p++ = cpu_to_be32(1);
2352                 *p++ = cpu_to_be32(bmval0);
2353         }
2354
2355         return 0;
2356 out_resource:
2357         return nfserr_resource;
2358 }
2359
2360 /*
2361  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2362  * ourselves.
2363  */
2364 static __be32
2365 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2366                 struct svc_export *exp,
2367                 struct dentry *dentry, u32 *bmval,
2368                 struct svc_rqst *rqstp, int ignore_crossmnt)
2369 {
2370         u32 bmval0 = bmval[0];
2371         u32 bmval1 = bmval[1];
2372         u32 bmval2 = bmval[2];
2373         struct kstat stat;
2374         struct svc_fh *tempfh = NULL;
2375         struct kstatfs statfs;
2376         __be32 *p;
2377         int starting_len = xdr->buf->len;
2378         int attrlen_offset;
2379         __be32 attrlen;
2380         u32 dummy;
2381         u64 dummy64;
2382         u32 rdattr_err = 0;
2383         __be32 status;
2384         int err;
2385         struct nfs4_acl *acl = NULL;
2386         void *context = NULL;
2387         int contextlen;
2388         bool contextsupport = false;
2389         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2390         u32 minorversion = resp->cstate.minorversion;
2391         struct path path = {
2392                 .mnt    = exp->ex_path.mnt,
2393                 .dentry = dentry,
2394         };
2395         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2396
2397         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2398         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2399
2400         if (exp->ex_fslocs.migrated) {
2401                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2402                 if (status)
2403                         goto out;
2404         }
2405
2406         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2407         if (err)
2408                 goto out_nfserr;
2409         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2410                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2411             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2412                        FATTR4_WORD1_SPACE_TOTAL))) {
2413                 err = vfs_statfs(&path, &statfs);
2414                 if (err)
2415                         goto out_nfserr;
2416         }
2417         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2418                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2419                 status = nfserr_jukebox;
2420                 if (!tempfh)
2421                         goto out;
2422                 fh_init(tempfh, NFS4_FHSIZE);
2423                 status = fh_compose(tempfh, exp, dentry, NULL);
2424                 if (status)
2425                         goto out;
2426                 fhp = tempfh;
2427         }
2428         if (bmval0 & FATTR4_WORD0_ACL) {
2429                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2430                 if (err == -EOPNOTSUPP)
2431                         bmval0 &= ~FATTR4_WORD0_ACL;
2432                 else if (err == -EINVAL) {
2433                         status = nfserr_attrnotsupp;
2434                         goto out;
2435                 } else if (err != 0)
2436                         goto out_nfserr;
2437         }
2438
2439 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2440         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2441              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2442                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2443                         err = security_inode_getsecctx(d_inode(dentry),
2444                                                 &context, &contextlen);
2445                 else
2446                         err = -EOPNOTSUPP;
2447                 contextsupport = (err == 0);
2448                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2449                         if (err == -EOPNOTSUPP)
2450                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2451                         else if (err)
2452                                 goto out_nfserr;
2453                 }
2454         }
2455 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2456
2457         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2458         if (status)
2459                 goto out;
2460
2461         attrlen_offset = xdr->buf->len;
2462         p = xdr_reserve_space(xdr, 4);
2463         if (!p)
2464                 goto out_resource;
2465         p++;                /* to be backfilled later */
2466
2467         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2468                 u32 supp[3];
2469
2470                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2471
2472                 if (!IS_POSIXACL(dentry->d_inode))
2473                         supp[0] &= ~FATTR4_WORD0_ACL;
2474                 if (!contextsupport)
2475                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2476                 if (!supp[2]) {
2477                         p = xdr_reserve_space(xdr, 12);
2478                         if (!p)
2479                                 goto out_resource;
2480                         *p++ = cpu_to_be32(2);
2481                         *p++ = cpu_to_be32(supp[0]);
2482                         *p++ = cpu_to_be32(supp[1]);
2483                 } else {
2484                         p = xdr_reserve_space(xdr, 16);
2485                         if (!p)
2486                                 goto out_resource;
2487                         *p++ = cpu_to_be32(3);
2488                         *p++ = cpu_to_be32(supp[0]);
2489                         *p++ = cpu_to_be32(supp[1]);
2490                         *p++ = cpu_to_be32(supp[2]);
2491                 }
2492         }
2493         if (bmval0 & FATTR4_WORD0_TYPE) {
2494                 p = xdr_reserve_space(xdr, 4);
2495                 if (!p)
2496                         goto out_resource;
2497                 dummy = nfs4_file_type(stat.mode);
2498                 if (dummy == NF4BAD) {
2499                         status = nfserr_serverfault;
2500                         goto out;
2501                 }
2502                 *p++ = cpu_to_be32(dummy);
2503         }
2504         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2505                 p = xdr_reserve_space(xdr, 4);
2506                 if (!p)
2507                         goto out_resource;
2508                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2509                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2510                 else
2511                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2512                                                 NFS4_FH_VOL_RENAME);
2513         }
2514         if (bmval0 & FATTR4_WORD0_CHANGE) {
2515                 p = xdr_reserve_space(xdr, 8);
2516                 if (!p)
2517                         goto out_resource;
2518                 p = encode_change(p, &stat, d_inode(dentry), exp);
2519         }
2520         if (bmval0 & FATTR4_WORD0_SIZE) {
2521                 p = xdr_reserve_space(xdr, 8);
2522                 if (!p)
2523                         goto out_resource;
2524                 p = xdr_encode_hyper(p, stat.size);
2525         }
2526         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2527                 p = xdr_reserve_space(xdr, 4);
2528                 if (!p)
2529                         goto out_resource;
2530                 *p++ = cpu_to_be32(1);
2531         }
2532         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2533                 p = xdr_reserve_space(xdr, 4);
2534                 if (!p)
2535                         goto out_resource;
2536                 *p++ = cpu_to_be32(1);
2537         }
2538         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2539                 p = xdr_reserve_space(xdr, 4);
2540                 if (!p)
2541                         goto out_resource;
2542                 *p++ = cpu_to_be32(0);
2543         }
2544         if (bmval0 & FATTR4_WORD0_FSID) {
2545                 p = xdr_reserve_space(xdr, 16);
2546                 if (!p)
2547                         goto out_resource;
2548                 if (exp->ex_fslocs.migrated) {
2549                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2550                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2551                 } else switch(fsid_source(fhp)) {
2552                 case FSIDSOURCE_FSID:
2553                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2554                         p = xdr_encode_hyper(p, (u64)0);
2555                         break;
2556                 case FSIDSOURCE_DEV:
2557                         *p++ = cpu_to_be32(0);
2558                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2559                         *p++ = cpu_to_be32(0);
2560                         *p++ = cpu_to_be32(MINOR(stat.dev));
2561                         break;
2562                 case FSIDSOURCE_UUID:
2563                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2564                                                                 EX_UUID_LEN);
2565                         break;
2566                 }
2567         }
2568         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2569                 p = xdr_reserve_space(xdr, 4);
2570                 if (!p)
2571                         goto out_resource;
2572                 *p++ = cpu_to_be32(0);
2573         }
2574         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2575                 p = xdr_reserve_space(xdr, 4);
2576                 if (!p)
2577                         goto out_resource;
2578                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2579         }
2580         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2581                 p = xdr_reserve_space(xdr, 4);
2582                 if (!p)
2583                         goto out_resource;
2584                 *p++ = cpu_to_be32(rdattr_err);
2585         }
2586         if (bmval0 & FATTR4_WORD0_ACL) {
2587                 struct nfs4_ace *ace;
2588
2589                 if (acl == NULL) {
2590                         p = xdr_reserve_space(xdr, 4);
2591                         if (!p)
2592                                 goto out_resource;
2593
2594                         *p++ = cpu_to_be32(0);
2595                         goto out_acl;
2596                 }
2597                 p = xdr_reserve_space(xdr, 4);
2598                 if (!p)
2599                         goto out_resource;
2600                 *p++ = cpu_to_be32(acl->naces);
2601
2602                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2603                         p = xdr_reserve_space(xdr, 4*3);
2604                         if (!p)
2605                                 goto out_resource;
2606                         *p++ = cpu_to_be32(ace->type);
2607                         *p++ = cpu_to_be32(ace->flag);
2608                         *p++ = cpu_to_be32(ace->access_mask &
2609                                                         NFS4_ACE_MASK_ALL);
2610                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2611                         if (status)
2612                                 goto out;
2613                 }
2614         }
2615 out_acl:
2616         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2617                 p = xdr_reserve_space(xdr, 4);
2618                 if (!p)
2619                         goto out_resource;
2620                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2621                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2622         }
2623         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2624                 p = xdr_reserve_space(xdr, 4);
2625                 if (!p)
2626                         goto out_resource;
2627                 *p++ = cpu_to_be32(1);
2628         }
2629         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2630                 p = xdr_reserve_space(xdr, 4);
2631                 if (!p)
2632                         goto out_resource;
2633                 *p++ = cpu_to_be32(0);
2634         }
2635         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2636                 p = xdr_reserve_space(xdr, 4);
2637                 if (!p)
2638                         goto out_resource;
2639                 *p++ = cpu_to_be32(1);
2640         }
2641         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2642                 p = xdr_reserve_space(xdr, 4);
2643                 if (!p)
2644                         goto out_resource;
2645                 *p++ = cpu_to_be32(1);
2646         }
2647         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2648                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2649                 if (!p)
2650                         goto out_resource;
2651                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2652                                         fhp->fh_handle.fh_size);
2653         }
2654         if (bmval0 & FATTR4_WORD0_FILEID) {
2655                 p = xdr_reserve_space(xdr, 8);
2656                 if (!p)
2657                         goto out_resource;
2658                 p = xdr_encode_hyper(p, stat.ino);
2659         }
2660         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2661                 p = xdr_reserve_space(xdr, 8);
2662                 if (!p)
2663                         goto out_resource;
2664                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2665         }
2666         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2667                 p = xdr_reserve_space(xdr, 8);
2668                 if (!p)
2669                         goto out_resource;
2670                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2671         }
2672         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2673                 p = xdr_reserve_space(xdr, 8);
2674                 if (!p)
2675                         goto out_resource;
2676                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2677         }
2678         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2679                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2680                 if (status)
2681                         goto out;
2682         }
2683         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2684                 p = xdr_reserve_space(xdr, 4);
2685                 if (!p)
2686                         goto out_resource;
2687                 *p++ = cpu_to_be32(1);
2688         }
2689         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2690                 p = xdr_reserve_space(xdr, 8);
2691                 if (!p)
2692                         goto out_resource;
2693                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2694         }
2695         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2696                 p = xdr_reserve_space(xdr, 4);
2697                 if (!p)
2698                         goto out_resource;
2699                 *p++ = cpu_to_be32(255);
2700         }
2701         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2702                 p = xdr_reserve_space(xdr, 4);
2703                 if (!p)
2704                         goto out_resource;
2705                 *p++ = cpu_to_be32(statfs.f_namelen);
2706         }
2707         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2708                 p = xdr_reserve_space(xdr, 8);
2709                 if (!p)
2710                         goto out_resource;
2711                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2712         }
2713         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2714                 p = xdr_reserve_space(xdr, 8);
2715                 if (!p)
2716                         goto out_resource;
2717                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2718         }
2719         if (bmval1 & FATTR4_WORD1_MODE) {
2720                 p = xdr_reserve_space(xdr, 4);
2721                 if (!p)
2722                         goto out_resource;
2723                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2724         }
2725         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2726                 p = xdr_reserve_space(xdr, 4);
2727                 if (!p)
2728                         goto out_resource;
2729                 *p++ = cpu_to_be32(1);
2730         }
2731         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2732                 p = xdr_reserve_space(xdr, 4);
2733                 if (!p)
2734                         goto out_resource;
2735                 *p++ = cpu_to_be32(stat.nlink);
2736         }
2737         if (bmval1 & FATTR4_WORD1_OWNER) {
2738                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2739                 if (status)
2740                         goto out;
2741         }
2742         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2743                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2744                 if (status)
2745                         goto out;
2746         }
2747         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2748                 p = xdr_reserve_space(xdr, 8);
2749                 if (!p)
2750                         goto out_resource;
2751                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2752                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2753         }
2754         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2755                 p = xdr_reserve_space(xdr, 8);
2756                 if (!p)
2757                         goto out_resource;
2758                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2759                 p = xdr_encode_hyper(p, dummy64);
2760         }
2761         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2762                 p = xdr_reserve_space(xdr, 8);
2763                 if (!p)
2764                         goto out_resource;
2765                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2766                 p = xdr_encode_hyper(p, dummy64);
2767         }
2768         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2769                 p = xdr_reserve_space(xdr, 8);
2770                 if (!p)
2771                         goto out_resource;
2772                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2773                 p = xdr_encode_hyper(p, dummy64);
2774         }
2775         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2776                 p = xdr_reserve_space(xdr, 8);
2777                 if (!p)
2778                         goto out_resource;
2779                 dummy64 = (u64)stat.blocks << 9;
2780                 p = xdr_encode_hyper(p, dummy64);
2781         }
2782         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2783                 p = xdr_reserve_space(xdr, 12);
2784                 if (!p)
2785                         goto out_resource;
2786                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2787                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2788         }
2789         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2790                 p = xdr_reserve_space(xdr, 12);
2791                 if (!p)
2792                         goto out_resource;
2793                 *p++ = cpu_to_be32(0);
2794                 *p++ = cpu_to_be32(1);
2795                 *p++ = cpu_to_be32(0);
2796         }
2797         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2798                 p = xdr_reserve_space(xdr, 12);
2799                 if (!p)
2800                         goto out_resource;
2801                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2802                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2803         }
2804         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2805                 p = xdr_reserve_space(xdr, 12);
2806                 if (!p)
2807                         goto out_resource;
2808                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2809                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2810         }
2811         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2812                 struct kstat parent_stat;
2813                 u64 ino = stat.ino;
2814
2815                 p = xdr_reserve_space(xdr, 8);
2816                 if (!p)
2817                         goto out_resource;
2818                 /*
2819                  * Get parent's attributes if not ignoring crossmount
2820                  * and this is the root of a cross-mounted filesystem.
2821                  */
2822                 if (ignore_crossmnt == 0 &&
2823                     dentry == exp->ex_path.mnt->mnt_root) {
2824                         err = get_parent_attributes(exp, &parent_stat);
2825                         if (err)
2826                                 goto out_nfserr;
2827                         ino = parent_stat.ino;
2828                 }
2829                 p = xdr_encode_hyper(p, ino);
2830         }
2831 #ifdef CONFIG_NFSD_PNFS
2832         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2833                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2834                 if (status)
2835                         goto out;
2836         }
2837
2838         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2839                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2840                 if (status)
2841                         goto out;
2842         }
2843
2844         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2845                 p = xdr_reserve_space(xdr, 4);
2846                 if (!p)
2847                         goto out_resource;
2848                 *p++ = cpu_to_be32(stat.blksize);
2849         }
2850 #endif /* CONFIG_NFSD_PNFS */
2851         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2852                 u32 supp[3];
2853
2854                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2855                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2856                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2857                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2858
2859                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2860                 if (status)
2861                         goto out;
2862         }
2863
2864         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2865                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2866                                                                 contextlen);
2867                 if (status)
2868                         goto out;
2869         }
2870
2871         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2872         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2873         status = nfs_ok;
2874
2875 out:
2876 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2877         if (context)
2878                 security_release_secctx(context, contextlen);
2879 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2880         kfree(acl);
2881         if (tempfh) {
2882                 fh_put(tempfh);
2883                 kfree(tempfh);
2884         }
2885         if (status)
2886                 xdr_truncate_encode(xdr, starting_len);
2887         return status;
2888 out_nfserr:
2889         status = nfserrno(err);
2890         goto out;
2891 out_resource:
2892         status = nfserr_resource;
2893         goto out;
2894 }
2895
2896 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2897                                 struct xdr_buf *buf, __be32 *p, int bytes)
2898 {
2899         xdr->scratch.iov_len = 0;
2900         memset(buf, 0, sizeof(struct xdr_buf));
2901         buf->head[0].iov_base = p;
2902         buf->head[0].iov_len = 0;
2903         buf->len = 0;
2904         xdr->buf = buf;
2905         xdr->iov = buf->head;
2906         xdr->p = p;
2907         xdr->end = (void *)p + bytes;
2908         buf->buflen = bytes;
2909 }
2910
2911 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2912                         struct svc_fh *fhp, struct svc_export *exp,
2913                         struct dentry *dentry, u32 *bmval,
2914                         struct svc_rqst *rqstp, int ignore_crossmnt)
2915 {
2916         struct xdr_buf dummy;
2917         struct xdr_stream xdr;
2918         __be32 ret;
2919
2920         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2921         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2922                                                         ignore_crossmnt);
2923         *p = xdr.p;
2924         return ret;
2925 }
2926
2927 static inline int attributes_need_mount(u32 *bmval)
2928 {
2929         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2930                 return 1;
2931         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2932                 return 1;
2933         return 0;
2934 }
2935
2936 static __be32
2937 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2938                         const char *name, int namlen)
2939 {
2940         struct svc_export *exp = cd->rd_fhp->fh_export;
2941         struct dentry *dentry;
2942         __be32 nfserr;
2943         int ignore_crossmnt = 0;
2944
2945         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2946         if (IS_ERR(dentry))
2947                 return nfserrno(PTR_ERR(dentry));
2948         if (d_really_is_negative(dentry)) {
2949                 /*
2950                  * we're not holding the i_mutex here, so there's
2951                  * a window where this directory entry could have gone
2952                  * away.
2953                  */
2954                 dput(dentry);
2955                 return nfserr_noent;
2956         }
2957
2958         exp_get(exp);
2959         /*
2960          * In the case of a mountpoint, the client may be asking for
2961          * attributes that are only properties of the underlying filesystem
2962          * as opposed to the cross-mounted file system. In such a case,
2963          * we will not follow the cross mount and will fill the attribtutes
2964          * directly from the mountpoint dentry.
2965          */
2966         if (nfsd_mountpoint(dentry, exp)) {
2967                 int err;
2968
2969                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2970                                 && !attributes_need_mount(cd->rd_bmval)) {
2971                         ignore_crossmnt = 1;
2972                         goto out_encode;
2973                 }
2974                 /*
2975                  * Why the heck aren't we just using nfsd_lookup??
2976                  * Different "."/".." handling?  Something else?
2977                  * At least, add a comment here to explain....
2978                  */
2979                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2980                 if (err) {
2981                         nfserr = nfserrno(err);
2982                         goto out_put;
2983                 }
2984                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2985                 if (nfserr)
2986                         goto out_put;
2987
2988         }
2989 out_encode:
2990         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2991                                         cd->rd_rqstp, ignore_crossmnt);
2992 out_put:
2993         dput(dentry);
2994         exp_put(exp);
2995         return nfserr;
2996 }
2997
2998 static __be32 *
2999 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3000 {
3001         __be32 *p;
3002
3003         p = xdr_reserve_space(xdr, 20);
3004         if (!p)
3005                 return NULL;
3006         *p++ = htonl(2);
3007         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3008         *p++ = htonl(0);                         /* bmval1 */
3009
3010         *p++ = htonl(4);     /* attribute length */
3011         *p++ = nfserr;       /* no htonl */
3012         return p;
3013 }
3014
3015 static int
3016 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3017                     loff_t offset, u64 ino, unsigned int d_type)
3018 {
3019         struct readdir_cd *ccd = ccdv;
3020         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3021         struct xdr_stream *xdr = cd->xdr;
3022         int start_offset = xdr->buf->len;
3023         int cookie_offset;
3024         u32 name_and_cookie;
3025         int entry_bytes;
3026         __be32 nfserr = nfserr_toosmall;
3027         __be64 wire_offset;
3028         __be32 *p;
3029
3030         /* In nfsv4, "." and ".." never make it onto the wire.. */
3031         if (name && isdotent(name, namlen)) {
3032                 cd->common.err = nfs_ok;
3033                 return 0;
3034         }
3035
3036         if (cd->cookie_offset) {
3037                 wire_offset = cpu_to_be64(offset);
3038                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3039                                                         &wire_offset, 8);
3040         }
3041
3042         p = xdr_reserve_space(xdr, 4);
3043         if (!p)
3044                 goto fail;
3045         *p++ = xdr_one;                             /* mark entry present */
3046         cookie_offset = xdr->buf->len;
3047         p = xdr_reserve_space(xdr, 3*4 + namlen);
3048         if (!p)
3049                 goto fail;
3050         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3051         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3052
3053         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3054         switch (nfserr) {
3055         case nfs_ok:
3056                 break;
3057         case nfserr_resource:
3058                 nfserr = nfserr_toosmall;
3059                 goto fail;
3060         case nfserr_noent:
3061                 xdr_truncate_encode(xdr, start_offset);
3062                 goto skip_entry;
3063         default:
3064                 /*
3065                  * If the client requested the RDATTR_ERROR attribute,
3066                  * we stuff the error code into this attribute
3067                  * and continue.  If this attribute was not requested,
3068                  * then in accordance with the spec, we fail the
3069                  * entire READDIR operation(!)
3070                  */
3071                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3072                         goto fail;
3073                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3074                 if (p == NULL) {
3075                         nfserr = nfserr_toosmall;
3076                         goto fail;
3077                 }
3078         }
3079         nfserr = nfserr_toosmall;
3080         entry_bytes = xdr->buf->len - start_offset;
3081         if (entry_bytes > cd->rd_maxcount)
3082                 goto fail;
3083         cd->rd_maxcount -= entry_bytes;
3084         /*
3085          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3086          * let's always let through the first entry, at least:
3087          */
3088         if (!cd->rd_dircount)
3089                 goto fail;
3090         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3091         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3092                 goto fail;
3093         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3094
3095         cd->cookie_offset = cookie_offset;
3096 skip_entry:
3097         cd->common.err = nfs_ok;
3098         return 0;
3099 fail:
3100         xdr_truncate_encode(xdr, start_offset);
3101         cd->common.err = nfserr;
3102         return -EINVAL;
3103 }
3104
3105 static __be32
3106 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3107 {
3108         __be32 *p;
3109
3110         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3111         if (!p)
3112                 return nfserr_resource;
3113         *p++ = cpu_to_be32(sid->si_generation);
3114         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3115                                         sizeof(stateid_opaque_t));
3116         return 0;
3117 }
3118
3119 static __be32
3120 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3121 {
3122         struct xdr_stream *xdr = &resp->xdr;
3123         __be32 *p;
3124
3125         p = xdr_reserve_space(xdr, 8);
3126         if (!p)
3127                 return nfserr_resource;
3128         *p++ = cpu_to_be32(access->ac_supported);
3129         *p++ = cpu_to_be32(access->ac_resp_access);
3130         return 0;
3131 }
3132
3133 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3134 {
3135         struct xdr_stream *xdr = &resp->xdr;
3136         __be32 *p;
3137
3138         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3139         if (!p)
3140                 return nfserr_resource;
3141         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3142                                         NFS4_MAX_SESSIONID_LEN);
3143         *p++ = cpu_to_be32(bcts->dir);
3144         /* Upshifting from TCP to RDMA is not supported */
3145         *p++ = cpu_to_be32(0);
3146         return 0;
3147 }
3148
3149 static __be32
3150 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3151 {
3152         struct xdr_stream *xdr = &resp->xdr;
3153
3154         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3155 }
3156
3157
3158 static __be32
3159 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3160 {
3161         struct xdr_stream *xdr = &resp->xdr;
3162         __be32 *p;
3163
3164         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3165         if (!p)
3166                 return nfserr_resource;
3167         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3168                                                 NFS4_VERIFIER_SIZE);
3169         return 0;
3170 }
3171
3172 static __be32
3173 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3174 {
3175         struct xdr_stream *xdr = &resp->xdr;
3176         __be32 *p;
3177
3178         p = xdr_reserve_space(xdr, 20);
3179         if (!p)
3180                 return nfserr_resource;
3181         encode_cinfo(p, &create->cr_cinfo);
3182         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3183                         create->cr_bmval[1], create->cr_bmval[2]);
3184         return 0;
3185 }
3186
3187 static __be32
3188 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3189 {
3190         struct svc_fh *fhp = getattr->ga_fhp;
3191         struct xdr_stream *xdr = &resp->xdr;
3192
3193         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3194                                     getattr->ga_bmval, resp->rqstp, 0);
3195 }
3196
3197 static __be32
3198 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3199 {
3200         struct xdr_stream *xdr = &resp->xdr;
3201         struct svc_fh *fhp = *fhpp;
3202         unsigned int len;
3203         __be32 *p;
3204
3205         len = fhp->fh_handle.fh_size;
3206         p = xdr_reserve_space(xdr, len + 4);
3207         if (!p)
3208                 return nfserr_resource;
3209         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3210         return 0;
3211 }
3212
3213 /*
3214 * Including all fields other than the name, a LOCK4denied structure requires
3215 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3216 */
3217 static __be32
3218 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3219 {
3220         struct xdr_netobj *conf = &ld->ld_owner;
3221         __be32 *p;
3222
3223 again:
3224         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3225         if (!p) {
3226                 /*
3227                  * Don't fail to return the result just because we can't
3228                  * return the conflicting open:
3229                  */
3230                 if (conf->len) {
3231                         kfree(conf->data);
3232                         conf->len = 0;
3233                         conf->data = NULL;
3234                         goto again;
3235                 }
3236                 return nfserr_resource;
3237         }
3238         p = xdr_encode_hyper(p, ld->ld_start);
3239         p = xdr_encode_hyper(p, ld->ld_length);
3240         *p++ = cpu_to_be32(ld->ld_type);
3241         if (conf->len) {
3242                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3243                 p = xdr_encode_opaque(p, conf->data, conf->len);
3244                 kfree(conf->data);
3245         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3246                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3247                 *p++ = cpu_to_be32(0); /* length of owner name */
3248         }
3249         return nfserr_denied;
3250 }
3251
3252 static __be32
3253 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3254 {
3255         struct xdr_stream *xdr = &resp->xdr;
3256
3257         if (!nfserr)
3258                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3259         else if (nfserr == nfserr_denied)
3260                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3261
3262         return nfserr;
3263 }
3264
3265 static __be32
3266 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3267 {
3268         struct xdr_stream *xdr = &resp->xdr;
3269
3270         if (nfserr == nfserr_denied)
3271                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3272         return nfserr;
3273 }
3274
3275 static __be32
3276 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3277 {
3278         struct xdr_stream *xdr = &resp->xdr;
3279
3280         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3281 }
3282
3283
3284 static __be32
3285 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3286 {
3287         struct xdr_stream *xdr = &resp->xdr;
3288         __be32 *p;
3289
3290         p = xdr_reserve_space(xdr, 20);
3291         if (!p)
3292                 return nfserr_resource;
3293         p = encode_cinfo(p, &link->li_cinfo);
3294         return 0;
3295 }
3296
3297
3298 static __be32
3299 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3300 {
3301         struct xdr_stream *xdr = &resp->xdr;
3302         __be32 *p;
3303
3304         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3305         if (nfserr)
3306                 return nfserr;
3307         p = xdr_reserve_space(xdr, 24);
3308         if (!p)
3309                 return nfserr_resource;
3310         p = encode_cinfo(p, &open->op_cinfo);
3311         *p++ = cpu_to_be32(open->op_rflags);
3312
3313         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3314                                         open->op_bmval[2]);
3315         if (nfserr)
3316                 return nfserr;
3317
3318         p = xdr_reserve_space(xdr, 4);
3319         if (!p)
3320                 return nfserr_resource;
3321
3322         *p++ = cpu_to_be32(open->op_delegate_type);
3323         switch (open->op_delegate_type) {
3324         case NFS4_OPEN_DELEGATE_NONE:
3325                 break;
3326         case NFS4_OPEN_DELEGATE_READ:
3327                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3328                 if (nfserr)
3329                         return nfserr;
3330                 p = xdr_reserve_space(xdr, 20);
3331                 if (!p)
3332                         return nfserr_resource;
3333                 *p++ = cpu_to_be32(open->op_recall);
3334
3335                 /*
3336                  * TODO: ACE's in delegations
3337                  */
3338                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3339                 *p++ = cpu_to_be32(0);
3340                 *p++ = cpu_to_be32(0);
3341                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3342                 break;
3343         case NFS4_OPEN_DELEGATE_WRITE:
3344                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3345                 if (nfserr)
3346                         return nfserr;
3347                 p = xdr_reserve_space(xdr, 32);
3348                 if (!p)
3349                         return nfserr_resource;
3350                 *p++ = cpu_to_be32(0);
3351
3352                 /*
3353                  * TODO: space_limit's in delegations
3354                  */
3355                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3356                 *p++ = cpu_to_be32(~(u32)0);
3357                 *p++ = cpu_to_be32(~(u32)0);
3358
3359                 /*
3360                  * TODO: ACE's in delegations
3361                  */
3362                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3363                 *p++ = cpu_to_be32(0);
3364                 *p++ = cpu_to_be32(0);
3365                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3366                 break;
3367         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3368                 switch (open->op_why_no_deleg) {
3369                 case WND4_CONTENTION:
3370                 case WND4_RESOURCE:
3371                         p = xdr_reserve_space(xdr, 8);
3372                         if (!p)
3373                                 return nfserr_resource;
3374                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3375                         /* deleg signaling not supported yet: */
3376                         *p++ = cpu_to_be32(0);
3377                         break;
3378                 default:
3379                         p = xdr_reserve_space(xdr, 4);
3380                         if (!p)
3381                                 return nfserr_resource;
3382                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3383                 }
3384                 break;
3385         default:
3386                 BUG();
3387         }
3388         /* XXX save filehandle here */
3389         return 0;
3390 }
3391
3392 static __be32
3393 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3394 {
3395         struct xdr_stream *xdr = &resp->xdr;
3396
3397         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3398 }
3399
3400 static __be32
3401 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3402 {
3403         struct xdr_stream *xdr = &resp->xdr;
3404
3405         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3406 }
3407
3408 static __be32 nfsd4_encode_splice_read(
3409                                 struct nfsd4_compoundres *resp,
3410                                 struct nfsd4_read *read,
3411                                 struct file *file, unsigned long maxcount)
3412 {
3413         struct xdr_stream *xdr = &resp->xdr;
3414         struct xdr_buf *buf = xdr->buf;
3415         u32 eof;
3416         long len;
3417         int space_left;
3418         __be32 nfserr;
3419         __be32 *p = xdr->p - 2;
3420
3421         /* Make sure there will be room for padding if needed */
3422         if (xdr->end - xdr->p < 1)
3423                 return nfserr_resource;
3424
3425         len = maxcount;
3426         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3427                                   read->rd_offset, &maxcount);
3428         if (nfserr) {
3429                 /*
3430                  * nfsd_splice_actor may have already messed with the
3431                  * page length; reset it so as not to confuse
3432                  * xdr_truncate_encode:
3433                  */
3434                 buf->page_len = 0;
3435                 return nfserr;
3436         }
3437
3438         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3439                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3440
3441         *(p++) = htonl(eof);
3442         *(p++) = htonl(maxcount);
3443
3444         buf->page_len = maxcount;
3445         buf->len += maxcount;
3446         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3447                                                         / PAGE_SIZE;
3448
3449         /* Use rest of head for padding and remaining ops: */
3450         buf->tail[0].iov_base = xdr->p;
3451         buf->tail[0].iov_len = 0;
3452         xdr->iov = buf->tail;
3453         if (maxcount&3) {
3454                 int pad = 4 - (maxcount&3);
3455