Merge tag 'nfsd-4.16' of git://linux-nfs.org/~bfields/linux
[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         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
459             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         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
480                 if (!umask)
481                         goto xdr_error;
482                 READ_BUF(8);
483                 len += 8;
484                 dummy32 = be32_to_cpup(p++);
485                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
486                 dummy32 = be32_to_cpup(p++);
487                 *umask = dummy32 & S_IRWXUGO;
488                 iattr->ia_valid |= ATTR_MODE;
489         }
490         if (len != expected_len)
491                 goto xdr_error;
492
493         DECODE_TAIL;
494 }
495
496 static __be32
497 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
498 {
499         DECODE_HEAD;
500
501         READ_BUF(sizeof(stateid_t));
502         sid->si_generation = be32_to_cpup(p++);
503         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
504
505         DECODE_TAIL;
506 }
507
508 static __be32
509 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
510 {
511         DECODE_HEAD;
512
513         READ_BUF(4);
514         access->ac_req_access = be32_to_cpup(p++);
515
516         DECODE_TAIL;
517 }
518
519 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
520 {
521         DECODE_HEAD;
522         u32 dummy, uid, gid;
523         char *machine_name;
524         int i;
525         int nr_secflavs;
526
527         /* callback_sec_params4 */
528         READ_BUF(4);
529         nr_secflavs = be32_to_cpup(p++);
530         if (nr_secflavs)
531                 cbs->flavor = (u32)(-1);
532         else
533                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
534                 cbs->flavor = 0;
535         for (i = 0; i < nr_secflavs; ++i) {
536                 READ_BUF(4);
537                 dummy = be32_to_cpup(p++);
538                 switch (dummy) {
539                 case RPC_AUTH_NULL:
540                         /* Nothing to read */
541                         if (cbs->flavor == (u32)(-1))
542                                 cbs->flavor = RPC_AUTH_NULL;
543                         break;
544                 case RPC_AUTH_UNIX:
545                         READ_BUF(8);
546                         /* stamp */
547                         dummy = be32_to_cpup(p++);
548
549                         /* machine name */
550                         dummy = be32_to_cpup(p++);
551                         READ_BUF(dummy);
552                         SAVEMEM(machine_name, dummy);
553
554                         /* uid, gid */
555                         READ_BUF(8);
556                         uid = be32_to_cpup(p++);
557                         gid = be32_to_cpup(p++);
558
559                         /* more gids */
560                         READ_BUF(4);
561                         dummy = be32_to_cpup(p++);
562                         READ_BUF(dummy * 4);
563                         if (cbs->flavor == (u32)(-1)) {
564                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
565                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
566                                 if (uid_valid(kuid) && gid_valid(kgid)) {
567                                         cbs->uid = kuid;
568                                         cbs->gid = kgid;
569                                         cbs->flavor = RPC_AUTH_UNIX;
570                                 } else {
571                                         dprintk("RPC_AUTH_UNIX with invalid"
572                                                 "uid or gid ignoring!\n");
573                                 }
574                         }
575                         break;
576                 case RPC_AUTH_GSS:
577                         dprintk("RPC_AUTH_GSS callback secflavor "
578                                 "not supported!\n");
579                         READ_BUF(8);
580                         /* gcbp_service */
581                         dummy = be32_to_cpup(p++);
582                         /* gcbp_handle_from_server */
583                         dummy = be32_to_cpup(p++);
584                         READ_BUF(dummy);
585                         p += XDR_QUADLEN(dummy);
586                         /* gcbp_handle_from_client */
587                         READ_BUF(4);
588                         dummy = be32_to_cpup(p++);
589                         READ_BUF(dummy);
590                         break;
591                 default:
592                         dprintk("Illegal callback secflavor\n");
593                         return nfserr_inval;
594                 }
595         }
596         DECODE_TAIL;
597 }
598
599 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
600 {
601         DECODE_HEAD;
602
603         READ_BUF(4);
604         bc->bc_cb_program = be32_to_cpup(p++);
605         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
606
607         DECODE_TAIL;
608 }
609
610 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
611 {
612         DECODE_HEAD;
613
614         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
615         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
616         bcts->dir = be32_to_cpup(p++);
617         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
618          * could help us figure out we should be using it. */
619         DECODE_TAIL;
620 }
621
622 static __be32
623 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
624 {
625         DECODE_HEAD;
626
627         READ_BUF(4);
628         close->cl_seqid = be32_to_cpup(p++);
629         return nfsd4_decode_stateid(argp, &close->cl_stateid);
630
631         DECODE_TAIL;
632 }
633
634
635 static __be32
636 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
637 {
638         DECODE_HEAD;
639
640         READ_BUF(12);
641         p = xdr_decode_hyper(p, &commit->co_offset);
642         commit->co_count = be32_to_cpup(p++);
643
644         DECODE_TAIL;
645 }
646
647 static __be32
648 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
649 {
650         DECODE_HEAD;
651
652         READ_BUF(4);
653         create->cr_type = be32_to_cpup(p++);
654         switch (create->cr_type) {
655         case NF4LNK:
656                 READ_BUF(4);
657                 create->cr_datalen = be32_to_cpup(p++);
658                 READ_BUF(create->cr_datalen);
659                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
660                 if (!create->cr_data)
661                         return nfserr_jukebox;
662                 break;
663         case NF4BLK:
664         case NF4CHR:
665                 READ_BUF(8);
666                 create->cr_specdata1 = be32_to_cpup(p++);
667                 create->cr_specdata2 = be32_to_cpup(p++);
668                 break;
669         case NF4SOCK:
670         case NF4FIFO:
671         case NF4DIR:
672         default:
673                 break;
674         }
675
676         READ_BUF(4);
677         create->cr_namelen = be32_to_cpup(p++);
678         READ_BUF(create->cr_namelen);
679         SAVEMEM(create->cr_name, create->cr_namelen);
680         if ((status = check_filename(create->cr_name, create->cr_namelen)))
681                 return status;
682
683         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
684                                     &create->cr_acl, &create->cr_label,
685                                     &current->fs->umask);
686         if (status)
687                 goto out;
688
689         DECODE_TAIL;
690 }
691
692 static inline __be32
693 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
694 {
695         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
696 }
697
698 static inline __be32
699 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
700 {
701         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
702 }
703
704 static __be32
705 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
706 {
707         DECODE_HEAD;
708
709         READ_BUF(4);
710         link->li_namelen = be32_to_cpup(p++);
711         READ_BUF(link->li_namelen);
712         SAVEMEM(link->li_name, link->li_namelen);
713         if ((status = check_filename(link->li_name, link->li_namelen)))
714                 return status;
715
716         DECODE_TAIL;
717 }
718
719 static __be32
720 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
721 {
722         DECODE_HEAD;
723
724         /*
725         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
726         */
727         READ_BUF(28);
728         lock->lk_type = be32_to_cpup(p++);
729         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
730                 goto xdr_error;
731         lock->lk_reclaim = be32_to_cpup(p++);
732         p = xdr_decode_hyper(p, &lock->lk_offset);
733         p = xdr_decode_hyper(p, &lock->lk_length);
734         lock->lk_is_new = be32_to_cpup(p++);
735
736         if (lock->lk_is_new) {
737                 READ_BUF(4);
738                 lock->lk_new_open_seqid = be32_to_cpup(p++);
739                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
740                 if (status)
741                         return status;
742                 READ_BUF(8 + sizeof(clientid_t));
743                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
744                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
745                 lock->lk_new_owner.len = be32_to_cpup(p++);
746                 READ_BUF(lock->lk_new_owner.len);
747                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
748         } else {
749                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
750                 if (status)
751                         return status;
752                 READ_BUF(4);
753                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
754         }
755
756         DECODE_TAIL;
757 }
758
759 static __be32
760 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
761 {
762         DECODE_HEAD;
763                         
764         READ_BUF(32);
765         lockt->lt_type = be32_to_cpup(p++);
766         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
767                 goto xdr_error;
768         p = xdr_decode_hyper(p, &lockt->lt_offset);
769         p = xdr_decode_hyper(p, &lockt->lt_length);
770         COPYMEM(&lockt->lt_clientid, 8);
771         lockt->lt_owner.len = be32_to_cpup(p++);
772         READ_BUF(lockt->lt_owner.len);
773         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
774
775         DECODE_TAIL;
776 }
777
778 static __be32
779 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
780 {
781         DECODE_HEAD;
782
783         READ_BUF(8);
784         locku->lu_type = be32_to_cpup(p++);
785         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
786                 goto xdr_error;
787         locku->lu_seqid = be32_to_cpup(p++);
788         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
789         if (status)
790                 return status;
791         READ_BUF(16);
792         p = xdr_decode_hyper(p, &locku->lu_offset);
793         p = xdr_decode_hyper(p, &locku->lu_length);
794
795         DECODE_TAIL;
796 }
797
798 static __be32
799 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
800 {
801         DECODE_HEAD;
802
803         READ_BUF(4);
804         lookup->lo_len = be32_to_cpup(p++);
805         READ_BUF(lookup->lo_len);
806         SAVEMEM(lookup->lo_name, lookup->lo_len);
807         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
808                 return status;
809
810         DECODE_TAIL;
811 }
812
813 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
814 {
815         __be32 *p;
816         u32 w;
817
818         READ_BUF(4);
819         w = be32_to_cpup(p++);
820         *share_access = w & NFS4_SHARE_ACCESS_MASK;
821         *deleg_want = w & NFS4_SHARE_WANT_MASK;
822         if (deleg_when)
823                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
824
825         switch (w & NFS4_SHARE_ACCESS_MASK) {
826         case NFS4_SHARE_ACCESS_READ:
827         case NFS4_SHARE_ACCESS_WRITE:
828         case NFS4_SHARE_ACCESS_BOTH:
829                 break;
830         default:
831                 return nfserr_bad_xdr;
832         }
833         w &= ~NFS4_SHARE_ACCESS_MASK;
834         if (!w)
835                 return nfs_ok;
836         if (!argp->minorversion)
837                 return nfserr_bad_xdr;
838         switch (w & NFS4_SHARE_WANT_MASK) {
839         case NFS4_SHARE_WANT_NO_PREFERENCE:
840         case NFS4_SHARE_WANT_READ_DELEG:
841         case NFS4_SHARE_WANT_WRITE_DELEG:
842         case NFS4_SHARE_WANT_ANY_DELEG:
843         case NFS4_SHARE_WANT_NO_DELEG:
844         case NFS4_SHARE_WANT_CANCEL:
845                 break;
846         default:
847                 return nfserr_bad_xdr;
848         }
849         w &= ~NFS4_SHARE_WANT_MASK;
850         if (!w)
851                 return nfs_ok;
852
853         if (!deleg_when)        /* open_downgrade */
854                 return nfserr_inval;
855         switch (w) {
856         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
857         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
858         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
859               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
860                 return nfs_ok;
861         }
862 xdr_error:
863         return nfserr_bad_xdr;
864 }
865
866 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
867 {
868         __be32 *p;
869
870         READ_BUF(4);
871         *x = be32_to_cpup(p++);
872         /* Note: unlinke access bits, deny bits may be zero. */
873         if (*x & ~NFS4_SHARE_DENY_BOTH)
874                 return nfserr_bad_xdr;
875         return nfs_ok;
876 xdr_error:
877         return nfserr_bad_xdr;
878 }
879
880 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
881 {
882         __be32 *p;
883
884         READ_BUF(4);
885         o->len = be32_to_cpup(p++);
886
887         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
888                 return nfserr_bad_xdr;
889
890         READ_BUF(o->len);
891         SAVEMEM(o->data, o->len);
892         return nfs_ok;
893 xdr_error:
894         return nfserr_bad_xdr;
895 }
896
897 static __be32
898 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
899 {
900         DECODE_HEAD;
901         u32 dummy;
902
903         memset(open->op_bmval, 0, sizeof(open->op_bmval));
904         open->op_iattr.ia_valid = 0;
905         open->op_openowner = NULL;
906
907         open->op_xdr_error = 0;
908         /* seqid, share_access, share_deny, clientid, ownerlen */
909         READ_BUF(4);
910         open->op_seqid = be32_to_cpup(p++);
911         /* decode, yet ignore deleg_when until supported */
912         status = nfsd4_decode_share_access(argp, &open->op_share_access,
913                                            &open->op_deleg_want, &dummy);
914         if (status)
915                 goto xdr_error;
916         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
917         if (status)
918                 goto xdr_error;
919         READ_BUF(sizeof(clientid_t));
920         COPYMEM(&open->op_clientid, sizeof(clientid_t));
921         status = nfsd4_decode_opaque(argp, &open->op_owner);
922         if (status)
923                 goto xdr_error;
924         READ_BUF(4);
925         open->op_create = be32_to_cpup(p++);
926         switch (open->op_create) {
927         case NFS4_OPEN_NOCREATE:
928                 break;
929         case NFS4_OPEN_CREATE:
930                 current->fs->umask = 0;
931                 READ_BUF(4);
932                 open->op_createmode = be32_to_cpup(p++);
933                 switch (open->op_createmode) {
934                 case NFS4_CREATE_UNCHECKED:
935                 case NFS4_CREATE_GUARDED:
936                         status = nfsd4_decode_fattr(argp, open->op_bmval,
937                                 &open->op_iattr, &open->op_acl, &open->op_label,
938                                 &current->fs->umask);
939                         if (status)
940                                 goto out;
941                         break;
942                 case NFS4_CREATE_EXCLUSIVE:
943                         READ_BUF(NFS4_VERIFIER_SIZE);
944                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
945                         break;
946                 case NFS4_CREATE_EXCLUSIVE4_1:
947                         if (argp->minorversion < 1)
948                                 goto xdr_error;
949                         READ_BUF(NFS4_VERIFIER_SIZE);
950                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
951                         status = nfsd4_decode_fattr(argp, open->op_bmval,
952                                 &open->op_iattr, &open->op_acl, &open->op_label,
953                                 &current->fs->umask);
954                         if (status)
955                                 goto out;
956                         break;
957                 default:
958                         goto xdr_error;
959                 }
960                 break;
961         default:
962                 goto xdr_error;
963         }
964
965         /* open_claim */
966         READ_BUF(4);
967         open->op_claim_type = be32_to_cpup(p++);
968         switch (open->op_claim_type) {
969         case NFS4_OPEN_CLAIM_NULL:
970         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
971                 READ_BUF(4);
972                 open->op_fname.len = be32_to_cpup(p++);
973                 READ_BUF(open->op_fname.len);
974                 SAVEMEM(open->op_fname.data, open->op_fname.len);
975                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
976                         return status;
977                 break;
978         case NFS4_OPEN_CLAIM_PREVIOUS:
979                 READ_BUF(4);
980                 open->op_delegate_type = be32_to_cpup(p++);
981                 break;
982         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
983                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
984                 if (status)
985                         return status;
986                 READ_BUF(4);
987                 open->op_fname.len = be32_to_cpup(p++);
988                 READ_BUF(open->op_fname.len);
989                 SAVEMEM(open->op_fname.data, open->op_fname.len);
990                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
991                         return status;
992                 break;
993         case NFS4_OPEN_CLAIM_FH:
994         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
995                 if (argp->minorversion < 1)
996                         goto xdr_error;
997                 /* void */
998                 break;
999         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1000                 if (argp->minorversion < 1)
1001                         goto xdr_error;
1002                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1003                 if (status)
1004                         return status;
1005                 break;
1006         default:
1007                 goto xdr_error;
1008         }
1009
1010         DECODE_TAIL;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1015 {
1016         DECODE_HEAD;
1017
1018         if (argp->minorversion >= 1)
1019                 return nfserr_notsupp;
1020
1021         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1022         if (status)
1023                 return status;
1024         READ_BUF(4);
1025         open_conf->oc_seqid = be32_to_cpup(p++);
1026
1027         DECODE_TAIL;
1028 }
1029
1030 static __be32
1031 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1032 {
1033         DECODE_HEAD;
1034                     
1035         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1036         if (status)
1037                 return status;
1038         READ_BUF(4);
1039         open_down->od_seqid = be32_to_cpup(p++);
1040         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1041                                            &open_down->od_deleg_want, NULL);
1042         if (status)
1043                 return status;
1044         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1045         if (status)
1046                 return status;
1047         DECODE_TAIL;
1048 }
1049
1050 static __be32
1051 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1052 {
1053         DECODE_HEAD;
1054
1055         READ_BUF(4);
1056         putfh->pf_fhlen = be32_to_cpup(p++);
1057         if (putfh->pf_fhlen > NFS4_FHSIZE)
1058                 goto xdr_error;
1059         READ_BUF(putfh->pf_fhlen);
1060         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1061
1062         DECODE_TAIL;
1063 }
1064
1065 static __be32
1066 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1067 {
1068         if (argp->minorversion == 0)
1069                 return nfs_ok;
1070         return nfserr_notsupp;
1071 }
1072
1073 static __be32
1074 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1075 {
1076         DECODE_HEAD;
1077
1078         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1079         if (status)
1080                 return status;
1081         READ_BUF(12);
1082         p = xdr_decode_hyper(p, &read->rd_offset);
1083         read->rd_length = be32_to_cpup(p++);
1084
1085         DECODE_TAIL;
1086 }
1087
1088 static __be32
1089 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1090 {
1091         DECODE_HEAD;
1092
1093         READ_BUF(24);
1094         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1095         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1096         readdir->rd_dircount = be32_to_cpup(p++);
1097         readdir->rd_maxcount = be32_to_cpup(p++);
1098         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1099                 goto out;
1100
1101         DECODE_TAIL;
1102 }
1103
1104 static __be32
1105 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1106 {
1107         DECODE_HEAD;
1108
1109         READ_BUF(4);
1110         remove->rm_namelen = be32_to_cpup(p++);
1111         READ_BUF(remove->rm_namelen);
1112         SAVEMEM(remove->rm_name, remove->rm_namelen);
1113         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1114                 return status;
1115
1116         DECODE_TAIL;
1117 }
1118
1119 static __be32
1120 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1121 {
1122         DECODE_HEAD;
1123
1124         READ_BUF(4);
1125         rename->rn_snamelen = be32_to_cpup(p++);
1126         READ_BUF(rename->rn_snamelen);
1127         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1128         READ_BUF(4);
1129         rename->rn_tnamelen = be32_to_cpup(p++);
1130         READ_BUF(rename->rn_tnamelen);
1131         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1132         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1133                 return status;
1134         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1135                 return status;
1136
1137         DECODE_TAIL;
1138 }
1139
1140 static __be32
1141 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1142 {
1143         DECODE_HEAD;
1144
1145         if (argp->minorversion >= 1)
1146                 return nfserr_notsupp;
1147
1148         READ_BUF(sizeof(clientid_t));
1149         COPYMEM(clientid, sizeof(clientid_t));
1150
1151         DECODE_TAIL;
1152 }
1153
1154 static __be32
1155 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1156                      struct nfsd4_secinfo *secinfo)
1157 {
1158         DECODE_HEAD;
1159
1160         READ_BUF(4);
1161         secinfo->si_namelen = be32_to_cpup(p++);
1162         READ_BUF(secinfo->si_namelen);
1163         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1164         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1165         if (status)
1166                 return status;
1167         DECODE_TAIL;
1168 }
1169
1170 static __be32
1171 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1172                      struct nfsd4_secinfo_no_name *sin)
1173 {
1174         DECODE_HEAD;
1175
1176         READ_BUF(4);
1177         sin->sin_style = be32_to_cpup(p++);
1178         DECODE_TAIL;
1179 }
1180
1181 static __be32
1182 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1183 {
1184         __be32 status;
1185
1186         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1187         if (status)
1188                 return status;
1189         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1190                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1191 }
1192
1193 static __be32
1194 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1195 {
1196         DECODE_HEAD;
1197
1198         if (argp->minorversion >= 1)
1199                 return nfserr_notsupp;
1200
1201         READ_BUF(NFS4_VERIFIER_SIZE);
1202         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1203
1204         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1205         if (status)
1206                 return nfserr_bad_xdr;
1207         READ_BUF(8);
1208         setclientid->se_callback_prog = be32_to_cpup(p++);
1209         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1210         READ_BUF(setclientid->se_callback_netid_len);
1211         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1212         READ_BUF(4);
1213         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1214
1215         READ_BUF(setclientid->se_callback_addr_len);
1216         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1217         READ_BUF(4);
1218         setclientid->se_callback_ident = be32_to_cpup(p++);
1219
1220         DECODE_TAIL;
1221 }
1222
1223 static __be32
1224 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1225 {
1226         DECODE_HEAD;
1227
1228         if (argp->minorversion >= 1)
1229                 return nfserr_notsupp;
1230
1231         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1232         COPYMEM(&scd_c->sc_clientid, 8);
1233         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1234
1235         DECODE_TAIL;
1236 }
1237
1238 /* Also used for NVERIFY */
1239 static __be32
1240 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1241 {
1242         DECODE_HEAD;
1243
1244         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1245                 goto out;
1246
1247         /* For convenience's sake, we compare raw xdr'd attributes in
1248          * nfsd4_proc_verify */
1249
1250         READ_BUF(4);
1251         verify->ve_attrlen = be32_to_cpup(p++);
1252         READ_BUF(verify->ve_attrlen);
1253         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1254
1255         DECODE_TAIL;
1256 }
1257
1258 static __be32
1259 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1260 {
1261         int avail;
1262         int len;
1263         DECODE_HEAD;
1264
1265         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1266         if (status)
1267                 return status;
1268         READ_BUF(16);
1269         p = xdr_decode_hyper(p, &write->wr_offset);
1270         write->wr_stable_how = be32_to_cpup(p++);
1271         if (write->wr_stable_how > NFS_FILE_SYNC)
1272                 goto xdr_error;
1273         write->wr_buflen = be32_to_cpup(p++);
1274
1275         /* Sorry .. no magic macros for this.. *
1276          * READ_BUF(write->wr_buflen);
1277          * SAVEMEM(write->wr_buf, write->wr_buflen);
1278          */
1279         avail = (char*)argp->end - (char*)argp->p;
1280         if (avail + argp->pagelen < write->wr_buflen) {
1281                 dprintk("NFSD: xdr error (%s:%d)\n",
1282                                 __FILE__, __LINE__);
1283                 goto xdr_error;
1284         }
1285         write->wr_head.iov_base = p;
1286         write->wr_head.iov_len = avail;
1287         write->wr_pagelist = argp->pagelist;
1288
1289         len = XDR_QUADLEN(write->wr_buflen) << 2;
1290         if (len >= avail) {
1291                 int pages;
1292
1293                 len -= avail;
1294
1295                 pages = len >> PAGE_SHIFT;
1296                 argp->pagelist += pages;
1297                 argp->pagelen -= pages * PAGE_SIZE;
1298                 len -= pages * PAGE_SIZE;
1299
1300                 next_decode_page(argp);
1301         }
1302         argp->p += XDR_QUADLEN(len);
1303
1304         DECODE_TAIL;
1305 }
1306
1307 static __be32
1308 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1309 {
1310         DECODE_HEAD;
1311
1312         if (argp->minorversion >= 1)
1313                 return nfserr_notsupp;
1314
1315         READ_BUF(12);
1316         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1317         rlockowner->rl_owner.len = be32_to_cpup(p++);
1318         READ_BUF(rlockowner->rl_owner.len);
1319         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1320
1321         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1322                 return nfserr_inval;
1323         DECODE_TAIL;
1324 }
1325
1326 static __be32
1327 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1328                          struct nfsd4_exchange_id *exid)
1329 {
1330         int dummy, tmp;
1331         DECODE_HEAD;
1332
1333         READ_BUF(NFS4_VERIFIER_SIZE);
1334         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1335
1336         status = nfsd4_decode_opaque(argp, &exid->clname);
1337         if (status)
1338                 return nfserr_bad_xdr;
1339
1340         READ_BUF(4);
1341         exid->flags = be32_to_cpup(p++);
1342
1343         /* Ignore state_protect4_a */
1344         READ_BUF(4);
1345         exid->spa_how = be32_to_cpup(p++);
1346         switch (exid->spa_how) {
1347         case SP4_NONE:
1348                 break;
1349         case SP4_MACH_CRED:
1350                 /* spo_must_enforce */
1351                 status = nfsd4_decode_bitmap(argp,
1352                                         exid->spo_must_enforce);
1353                 if (status)
1354                         goto out;
1355                 /* spo_must_allow */
1356                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1357                 if (status)
1358                         goto out;
1359                 break;
1360         case SP4_SSV:
1361                 /* ssp_ops */
1362                 READ_BUF(4);
1363                 dummy = be32_to_cpup(p++);
1364                 READ_BUF(dummy * 4);
1365                 p += dummy;
1366
1367                 READ_BUF(4);
1368                 dummy = be32_to_cpup(p++);
1369                 READ_BUF(dummy * 4);
1370                 p += dummy;
1371
1372                 /* ssp_hash_algs<> */
1373                 READ_BUF(4);
1374                 tmp = be32_to_cpup(p++);
1375                 while (tmp--) {
1376                         READ_BUF(4);
1377                         dummy = be32_to_cpup(p++);
1378                         READ_BUF(dummy);
1379                         p += XDR_QUADLEN(dummy);
1380                 }
1381
1382                 /* ssp_encr_algs<> */
1383                 READ_BUF(4);
1384                 tmp = be32_to_cpup(p++);
1385                 while (tmp--) {
1386                         READ_BUF(4);
1387                         dummy = be32_to_cpup(p++);
1388                         READ_BUF(dummy);
1389                         p += XDR_QUADLEN(dummy);
1390                 }
1391
1392                 /* ssp_window and ssp_num_gss_handles */
1393                 READ_BUF(8);
1394                 dummy = be32_to_cpup(p++);
1395                 dummy = be32_to_cpup(p++);
1396                 break;
1397         default:
1398                 goto xdr_error;
1399         }
1400
1401         /* Ignore Implementation ID */
1402         READ_BUF(4);    /* nfs_impl_id4 array length */
1403         dummy = be32_to_cpup(p++);
1404
1405         if (dummy > 1)
1406                 goto xdr_error;
1407
1408         if (dummy == 1) {
1409                 /* nii_domain */
1410                 READ_BUF(4);
1411                 dummy = be32_to_cpup(p++);
1412                 READ_BUF(dummy);
1413                 p += XDR_QUADLEN(dummy);
1414
1415                 /* nii_name */
1416                 READ_BUF(4);
1417                 dummy = be32_to_cpup(p++);
1418                 READ_BUF(dummy);
1419                 p += XDR_QUADLEN(dummy);
1420
1421                 /* nii_date */
1422                 READ_BUF(12);
1423                 p += 3;
1424         }
1425         DECODE_TAIL;
1426 }
1427
1428 static __be32
1429 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1430                             struct nfsd4_create_session *sess)
1431 {
1432         DECODE_HEAD;
1433         u32 dummy;
1434
1435         READ_BUF(16);
1436         COPYMEM(&sess->clientid, 8);
1437         sess->seqid = be32_to_cpup(p++);
1438         sess->flags = be32_to_cpup(p++);
1439
1440         /* Fore channel attrs */
1441         READ_BUF(28);
1442         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1443         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1444         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1445         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1446         sess->fore_channel.maxops = be32_to_cpup(p++);
1447         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1448         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1449         if (sess->fore_channel.nr_rdma_attrs == 1) {
1450                 READ_BUF(4);
1451                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1452         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1453                 dprintk("Too many fore channel attr bitmaps!\n");
1454                 goto xdr_error;
1455         }
1456
1457         /* Back channel attrs */
1458         READ_BUF(28);
1459         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1460         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1461         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1462         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1463         sess->back_channel.maxops = be32_to_cpup(p++);
1464         sess->back_channel.maxreqs = be32_to_cpup(p++);
1465         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1466         if (sess->back_channel.nr_rdma_attrs == 1) {
1467                 READ_BUF(4);
1468                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1469         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1470                 dprintk("Too many back channel attr bitmaps!\n");
1471                 goto xdr_error;
1472         }
1473
1474         READ_BUF(4);
1475         sess->callback_prog = be32_to_cpup(p++);
1476         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1477         DECODE_TAIL;
1478 }
1479
1480 static __be32
1481 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1482                              struct nfsd4_destroy_session *destroy_session)
1483 {
1484         DECODE_HEAD;
1485         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1486         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1487
1488         DECODE_TAIL;
1489 }
1490
1491 static __be32
1492 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1493                           struct nfsd4_free_stateid *free_stateid)
1494 {
1495         DECODE_HEAD;
1496
1497         READ_BUF(sizeof(stateid_t));
1498         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1499         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1500
1501         DECODE_TAIL;
1502 }
1503
1504 static __be32
1505 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1506                       struct nfsd4_sequence *seq)
1507 {
1508         DECODE_HEAD;
1509
1510         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1511         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1512         seq->seqid = be32_to_cpup(p++);
1513         seq->slotid = be32_to_cpup(p++);
1514         seq->maxslots = be32_to_cpup(p++);
1515         seq->cachethis = be32_to_cpup(p++);
1516
1517         DECODE_TAIL;
1518 }
1519
1520 static __be32
1521 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1522 {
1523         int i;
1524         __be32 *p, status;
1525         struct nfsd4_test_stateid_id *stateid;
1526
1527         READ_BUF(4);
1528         test_stateid->ts_num_ids = ntohl(*p++);
1529
1530         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1531
1532         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1533                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1534                 if (!stateid) {
1535                         status = nfserrno(-ENOMEM);
1536                         goto out;
1537                 }
1538
1539                 INIT_LIST_HEAD(&stateid->ts_id_list);
1540                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1541
1542                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1543                 if (status)
1544                         goto out;
1545         }
1546
1547         status = 0;
1548 out:
1549         return status;
1550 xdr_error:
1551         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1552         status = nfserr_bad_xdr;
1553         goto out;
1554 }
1555
1556 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1557 {
1558         DECODE_HEAD;
1559
1560         READ_BUF(8);
1561         COPYMEM(&dc->clientid, 8);
1562
1563         DECODE_TAIL;
1564 }
1565
1566 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1567 {
1568         DECODE_HEAD;
1569
1570         READ_BUF(4);
1571         rc->rca_one_fs = be32_to_cpup(p++);
1572
1573         DECODE_TAIL;
1574 }
1575
1576 #ifdef CONFIG_NFSD_PNFS
1577 static __be32
1578 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1579                 struct nfsd4_getdeviceinfo *gdev)
1580 {
1581         DECODE_HEAD;
1582         u32 num, i;
1583
1584         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1585         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1586         gdev->gd_layout_type = be32_to_cpup(p++);
1587         gdev->gd_maxcount = be32_to_cpup(p++);
1588         num = be32_to_cpup(p++);
1589         if (num) {
1590                 READ_BUF(4 * num);
1591                 gdev->gd_notify_types = be32_to_cpup(p++);
1592                 for (i = 1; i < num; i++) {
1593                         if (be32_to_cpup(p++)) {
1594                                 status = nfserr_inval;
1595                                 goto out;
1596                         }
1597                 }
1598         }
1599         DECODE_TAIL;
1600 }
1601
1602 static __be32
1603 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1604                 struct nfsd4_layoutget *lgp)
1605 {
1606         DECODE_HEAD;
1607
1608         READ_BUF(36);
1609         lgp->lg_signal = be32_to_cpup(p++);
1610         lgp->lg_layout_type = be32_to_cpup(p++);
1611         lgp->lg_seg.iomode = be32_to_cpup(p++);
1612         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1613         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1614         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1615
1616         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1617         if (status)
1618                 return status;
1619
1620         READ_BUF(4);
1621         lgp->lg_maxcount = be32_to_cpup(p++);
1622
1623         DECODE_TAIL;
1624 }
1625
1626 static __be32
1627 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1628                 struct nfsd4_layoutcommit *lcp)
1629 {
1630         DECODE_HEAD;
1631         u32 timechange;
1632
1633         READ_BUF(20);
1634         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1635         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1636         lcp->lc_reclaim = be32_to_cpup(p++);
1637
1638         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1639         if (status)
1640                 return status;
1641
1642         READ_BUF(4);
1643         lcp->lc_newoffset = be32_to_cpup(p++);
1644         if (lcp->lc_newoffset) {
1645                 READ_BUF(8);
1646                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1647         } else
1648                 lcp->lc_last_wr = 0;
1649         READ_BUF(4);
1650         timechange = be32_to_cpup(p++);
1651         if (timechange) {
1652                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1653                 if (status)
1654                         return status;
1655         } else {
1656                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1657         }
1658         READ_BUF(8);
1659         lcp->lc_layout_type = be32_to_cpup(p++);
1660
1661         /*
1662          * Save the layout update in XDR format and let the layout driver deal
1663          * with it later.
1664          */
1665         lcp->lc_up_len = be32_to_cpup(p++);
1666         if (lcp->lc_up_len > 0) {
1667                 READ_BUF(lcp->lc_up_len);
1668                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1669         }
1670
1671         DECODE_TAIL;
1672 }
1673
1674 static __be32
1675 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1676                 struct nfsd4_layoutreturn *lrp)
1677 {
1678         DECODE_HEAD;
1679
1680         READ_BUF(16);
1681         lrp->lr_reclaim = be32_to_cpup(p++);
1682         lrp->lr_layout_type = be32_to_cpup(p++);
1683         lrp->lr_seg.iomode = be32_to_cpup(p++);
1684         lrp->lr_return_type = be32_to_cpup(p++);
1685         if (lrp->lr_return_type == RETURN_FILE) {
1686                 READ_BUF(16);
1687                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1688                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1689
1690                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1691                 if (status)
1692                         return status;
1693
1694                 READ_BUF(4);
1695                 lrp->lrf_body_len = be32_to_cpup(p++);
1696                 if (lrp->lrf_body_len > 0) {
1697                         READ_BUF(lrp->lrf_body_len);
1698                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1699                 }
1700         } else {
1701                 lrp->lr_seg.offset = 0;
1702                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1703         }
1704
1705         DECODE_TAIL;
1706 }
1707 #endif /* CONFIG_NFSD_PNFS */
1708
1709 static __be32
1710 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1711                        struct nfsd4_fallocate *fallocate)
1712 {
1713         DECODE_HEAD;
1714
1715         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1716         if (status)
1717                 return status;
1718
1719         READ_BUF(16);
1720         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1721         xdr_decode_hyper(p, &fallocate->falloc_length);
1722
1723         DECODE_TAIL;
1724 }
1725
1726 static __be32
1727 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1728 {
1729         DECODE_HEAD;
1730
1731         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1732         if (status)
1733                 return status;
1734         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1735         if (status)
1736                 return status;
1737
1738         READ_BUF(8 + 8 + 8);
1739         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1740         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1741         p = xdr_decode_hyper(p, &clone->cl_count);
1742         DECODE_TAIL;
1743 }
1744
1745 static __be32
1746 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1747 {
1748         DECODE_HEAD;
1749         unsigned int tmp;
1750
1751         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1752         if (status)
1753                 return status;
1754         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1755         if (status)
1756                 return status;
1757
1758         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1759         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1760         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1761         p = xdr_decode_hyper(p, &copy->cp_count);
1762         copy->cp_consecutive = be32_to_cpup(p++);
1763         copy->cp_synchronous = be32_to_cpup(p++);
1764         tmp = be32_to_cpup(p); /* Source server list not supported */
1765
1766         DECODE_TAIL;
1767 }
1768
1769 static __be32
1770 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1771 {
1772         DECODE_HEAD;
1773
1774         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1775         if (status)
1776                 return status;
1777
1778         READ_BUF(8 + 4);
1779         p = xdr_decode_hyper(p, &seek->seek_offset);
1780         seek->seek_whence = be32_to_cpup(p);
1781
1782         DECODE_TAIL;
1783 }
1784
1785 static __be32
1786 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1787 {
1788         return nfs_ok;
1789 }
1790
1791 static __be32
1792 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1793 {
1794         return nfserr_notsupp;
1795 }
1796
1797 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1798
1799 static const nfsd4_dec nfsd4_dec_ops[] = {
1800         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1801         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1802         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1803         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1804         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1805         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1806         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1807         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1808         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1809         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1810         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1811         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1812         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1813         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1814         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1815         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1816         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1817         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1818         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1819         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1820         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1821         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1822         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1823         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1824         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1825         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1826         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1827         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1828         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1829         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1830         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1831         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1832         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1833         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1834         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1835         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1836         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1837
1838         /* new operations for NFSv4.1 */
1839         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1840         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1841         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1842         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1843         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1844         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1845         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1846 #ifdef CONFIG_NFSD_PNFS
1847         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1848         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1849         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1850         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1851         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1852 #else
1853         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1854         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1856         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1858 #endif
1859         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1860         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1861         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1863         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1864         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1865         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1866
1867         /* new operations for NFSv4.2 */
1868         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1869         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1870         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1871         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1872         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1873         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1874         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1875         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1876         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1877         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1878         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1879         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1880         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1881 };
1882
1883 static inline bool
1884 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1885 {
1886         if (op->opnum < FIRST_NFS4_OP)
1887                 return false;
1888         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1889                 return false;
1890         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1891                 return false;
1892         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1893                 return false;
1894         return true;
1895 }
1896
1897 static __be32
1898 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1899 {
1900         DECODE_HEAD;
1901         struct nfsd4_op *op;
1902         bool cachethis = false;
1903         int auth_slack= argp->rqstp->rq_auth_slack;
1904         int max_reply = auth_slack + 8; /* opcnt, status */
1905         int readcount = 0;
1906         int readbytes = 0;
1907         int i;
1908
1909         READ_BUF(4);
1910         argp->taglen = be32_to_cpup(p++);
1911         READ_BUF(argp->taglen);
1912         SAVEMEM(argp->tag, argp->taglen);
1913         READ_BUF(8);
1914         argp->minorversion = be32_to_cpup(p++);
1915         argp->opcnt = be32_to_cpup(p++);
1916         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1917
1918         if (argp->taglen > NFSD4_MAX_TAGLEN)
1919                 goto xdr_error;
1920         /*
1921          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1922          * here, so we return success at the xdr level so that
1923          * nfsd4_proc can handle this is an NFS-level error.
1924          */
1925         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1926                 return 0;
1927
1928         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1929                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1930                 if (!argp->ops) {
1931                         argp->ops = argp->iops;
1932                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1933                         goto xdr_error;
1934                 }
1935         }
1936
1937         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1938                 argp->opcnt = 0;
1939
1940         for (i = 0; i < argp->opcnt; i++) {
1941                 op = &argp->ops[i];
1942                 op->replay = NULL;
1943
1944                 READ_BUF(4);
1945                 op->opnum = be32_to_cpup(p++);
1946
1947                 if (nfsd4_opnum_in_range(argp, op))
1948                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1949                 else {
1950                         op->opnum = OP_ILLEGAL;
1951                         op->status = nfserr_op_illegal;
1952                 }
1953                 op->opdesc = OPDESC(op);
1954                 /*
1955                  * We'll try to cache the result in the DRC if any one
1956                  * op in the compound wants to be cached:
1957                  */
1958                 cachethis |= nfsd4_cache_this_op(op);
1959
1960                 if (op->opnum == OP_READ) {
1961                         readcount++;
1962                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1963                 } else
1964                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1965                 /*
1966                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1967                  * (Special case because it will just skip encoding this
1968                  * if it runs out of xdr buffer space, and it is the only
1969                  * operation that behaves this way.)
1970                  */
1971                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1972                         max_reply += NFS4_OPAQUE_LIMIT;
1973
1974                 if (op->status) {
1975                         argp->opcnt = i+1;
1976                         break;
1977                 }
1978         }
1979         /* Sessions make the DRC unnecessary: */
1980         if (argp->minorversion)
1981                 cachethis = false;
1982         svc_reserve(argp->rqstp, max_reply + readbytes);
1983         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1984
1985         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1986                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1987
1988         DECODE_TAIL;
1989 }
1990
1991 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1992                              struct svc_export *exp)
1993 {
1994         if (exp->ex_flags & NFSEXP_V4ROOT) {
1995                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1996                 *p++ = 0;
1997         } else if (IS_I_VERSION(inode)) {
1998                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
1999         } else {
2000                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2001                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2002         }
2003         return p;
2004 }
2005
2006 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2007 {
2008         *p++ = cpu_to_be32(c->atomic);
2009         if (c->change_supported) {
2010                 p = xdr_encode_hyper(p, c->before_change);
2011                 p = xdr_encode_hyper(p, c->after_change);
2012         } else {
2013                 *p++ = cpu_to_be32(c->before_ctime_sec);
2014                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2015                 *p++ = cpu_to_be32(c->after_ctime_sec);
2016                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2017         }
2018         return p;
2019 }
2020
2021 /* Encode as an array of strings the string given with components
2022  * separated @sep, escaped with esc_enter and esc_exit.
2023  */
2024 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2025                                           char *components, char esc_enter,
2026                                           char esc_exit)
2027 {
2028         __be32 *p;
2029         __be32 pathlen;
2030         int pathlen_offset;
2031         int strlen, count=0;
2032         char *str, *end, *next;
2033
2034         dprintk("nfsd4_encode_components(%s)\n", components);
2035
2036         pathlen_offset = xdr->buf->len;
2037         p = xdr_reserve_space(xdr, 4);
2038         if (!p)
2039                 return nfserr_resource;
2040         p++; /* We will fill this in with @count later */
2041
2042         end = str = components;
2043         while (*end) {
2044                 bool found_esc = false;
2045
2046                 /* try to parse as esc_start, ..., esc_end, sep */
2047                 if (*str == esc_enter) {
2048                         for (; *end && (*end != esc_exit); end++)
2049                                 /* find esc_exit or end of string */;
2050                         next = end + 1;
2051                         if (*end && (!*next || *next == sep)) {
2052                                 str++;
2053                                 found_esc = true;
2054                         }
2055                 }
2056
2057                 if (!found_esc)
2058                         for (; *end && (*end != sep); end++)
2059                                 /* find sep or end of string */;
2060
2061                 strlen = end - str;
2062                 if (strlen) {
2063                         p = xdr_reserve_space(xdr, strlen + 4);
2064                         if (!p)
2065                                 return nfserr_resource;
2066                         p = xdr_encode_opaque(p, str, strlen);
2067                         count++;
2068                 }
2069                 else
2070                         end++;
2071                 if (found_esc)
2072                         end = next;
2073
2074                 str = end;
2075         }
2076         pathlen = htonl(count);
2077         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2078         return 0;
2079 }
2080
2081 /* Encode as an array of strings the string given with components
2082  * separated @sep.
2083  */
2084 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2085                                       char *components)
2086 {
2087         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2088 }
2089
2090 /*
2091  * encode a location element of a fs_locations structure
2092  */
2093 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2094                                         struct nfsd4_fs_location *location)
2095 {
2096         __be32 status;
2097
2098         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2099                                                 '[', ']');
2100         if (status)
2101                 return status;
2102         status = nfsd4_encode_components(xdr, '/', location->path);
2103         if (status)
2104                 return status;
2105         return 0;
2106 }
2107
2108 /*
2109  * Encode a path in RFC3530 'pathname4' format
2110  */
2111 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2112                                 const struct path *root,
2113                                 const struct path *path)
2114 {
2115         struct path cur = *path;
2116         __be32 *p;
2117         struct dentry **components = NULL;
2118         unsigned int ncomponents = 0;
2119         __be32 err = nfserr_jukebox;
2120
2121         dprintk("nfsd4_encode_components(");
2122
2123         path_get(&cur);
2124         /* First walk the path up to the nfsd root, and store the
2125          * dentries/path components in an array.
2126          */
2127         for (;;) {
2128                 if (path_equal(&cur, root))
2129                         break;
2130                 if (cur.dentry == cur.mnt->mnt_root) {
2131                         if (follow_up(&cur))
2132                                 continue;
2133                         goto out_free;
2134                 }
2135                 if ((ncomponents & 15) == 0) {
2136                         struct dentry **new;
2137                         new = krealloc(components,
2138                                         sizeof(*new) * (ncomponents + 16),
2139                                         GFP_KERNEL);
2140                         if (!new)
2141                                 goto out_free;
2142                         components = new;
2143                 }
2144                 components[ncomponents++] = cur.dentry;
2145                 cur.dentry = dget_parent(cur.dentry);
2146         }
2147         err = nfserr_resource;
2148         p = xdr_reserve_space(xdr, 4);
2149         if (!p)
2150                 goto out_free;
2151         *p++ = cpu_to_be32(ncomponents);
2152
2153         while (ncomponents) {
2154                 struct dentry *dentry = components[ncomponents - 1];
2155                 unsigned int len;
2156
2157                 spin_lock(&dentry->d_lock);
2158                 len = dentry->d_name.len;
2159                 p = xdr_reserve_space(xdr, len + 4);
2160                 if (!p) {
2161                         spin_unlock(&dentry->d_lock);
2162                         goto out_free;
2163                 }
2164                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2165                 dprintk("/%pd", dentry);
2166                 spin_unlock(&dentry->d_lock);
2167                 dput(dentry);
2168                 ncomponents--;
2169         }
2170
2171         err = 0;
2172 out_free:
2173         dprintk(")\n");
2174         while (ncomponents)
2175                 dput(components[--ncomponents]);
2176         kfree(components);
2177         path_put(&cur);
2178         return err;
2179 }
2180
2181 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2182                         struct svc_rqst *rqstp, const struct path *path)
2183 {
2184         struct svc_export *exp_ps;
2185         __be32 res;
2186
2187         exp_ps = rqst_find_fsidzero_export(rqstp);
2188         if (IS_ERR(exp_ps))
2189                 return nfserrno(PTR_ERR(exp_ps));
2190         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2191         exp_put(exp_ps);
2192         return res;
2193 }
2194
2195 /*
2196  *  encode a fs_locations structure
2197  */
2198 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2199                         struct svc_rqst *rqstp, struct svc_export *exp)
2200 {
2201         __be32 status;
2202         int i;
2203         __be32 *p;
2204         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2205
2206         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2207         if (status)
2208                 return status;
2209         p = xdr_reserve_space(xdr, 4);
2210         if (!p)
2211                 return nfserr_resource;
2212         *p++ = cpu_to_be32(fslocs->locations_count);
2213         for (i=0; i<fslocs->locations_count; i++) {
2214                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2215                 if (status)
2216                         return status;
2217         }
2218         return 0;
2219 }
2220
2221 static u32 nfs4_file_type(umode_t mode)
2222 {
2223         switch (mode & S_IFMT) {
2224         case S_IFIFO:   return NF4FIFO;
2225         case S_IFCHR:   return NF4CHR;
2226         case S_IFDIR:   return NF4DIR;
2227         case S_IFBLK:   return NF4BLK;
2228         case S_IFLNK:   return NF4LNK;
2229         case S_IFREG:   return NF4REG;
2230         case S_IFSOCK:  return NF4SOCK;
2231         default:        return NF4BAD;
2232         };
2233 }
2234
2235 static inline __be32
2236 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2237                      struct nfs4_ace *ace)
2238 {
2239         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2240                 return nfs4_acl_write_who(xdr, ace->whotype);
2241         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2242                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2243         else
2244                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2245 }
2246
2247 static inline __be32
2248 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2249 {
2250         __be32          *p;
2251         unsigned long   i = hweight_long(layout_types);
2252
2253         p = xdr_reserve_space(xdr, 4 + 4 * i);
2254         if (!p)
2255                 return nfserr_resource;
2256
2257         *p++ = cpu_to_be32(i);
2258
2259         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2260                 if (layout_types & (1 << i))
2261                         *p++ = cpu_to_be32(i);
2262
2263         return 0;
2264 }
2265
2266 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2267                               FATTR4_WORD0_RDATTR_ERROR)
2268 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2269 #define WORD2_ABSENT_FS_ATTRS 0
2270
2271 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2272 static inline __be32
2273 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2274                             void *context, int len)
2275 {
2276         __be32 *p;
2277
2278         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2279         if (!p)
2280                 return nfserr_resource;
2281
2282         /*
2283          * For now we use a 0 here to indicate the null translation; in
2284          * the future we may place a call to translation code here.
2285          */
2286         *p++ = cpu_to_be32(0); /* lfs */
2287         *p++ = cpu_to_be32(0); /* pi */
2288         p = xdr_encode_opaque(p, context, len);
2289         return 0;
2290 }
2291 #else
2292 static inline __be32
2293 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2294                             void *context, int len)
2295 { return 0; }
2296 #endif
2297
2298 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2299 {
2300         /* As per referral draft:  */
2301         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2302             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2303                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2304                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2305                         *rdattr_err = NFSERR_MOVED;
2306                 else
2307                         return nfserr_moved;
2308         }
2309         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2310         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2311         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2312         return 0;
2313 }
2314
2315
2316 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2317 {
2318         struct path path = exp->ex_path;
2319         int err;
2320
2321         path_get(&path);
2322         while (follow_up(&path)) {
2323                 if (path.dentry != path.mnt->mnt_root)
2324                         break;
2325         }
2326         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2327         path_put(&path);
2328         return err;
2329 }
2330
2331 static __be32
2332 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2333 {
2334         __be32 *p;
2335
2336         if (bmval2) {
2337                 p = xdr_reserve_space(xdr, 16);
2338                 if (!p)
2339                         goto out_resource;
2340                 *p++ = cpu_to_be32(3);
2341                 *p++ = cpu_to_be32(bmval0);
2342                 *p++ = cpu_to_be32(bmval1);
2343                 *p++ = cpu_to_be32(bmval2);
2344         } else if (bmval1) {
2345                 p = xdr_reserve_space(xdr, 12);
2346                 if (!p)
2347                         goto out_resource;
2348                 *p++ = cpu_to_be32(2);
2349                 *p++ = cpu_to_be32(bmval0);
2350                 *p++ = cpu_to_be32(bmval1);
2351         } else {
2352                 p = xdr_reserve_space(xdr, 8);
2353                 if (!p)
2354                         goto out_resource;
2355                 *p++ = cpu_to_be32(1);
2356                 *p++ = cpu_to_be32(bmval0);
2357         }
2358
2359         return 0;
2360 out_resource:
2361         return nfserr_resource;
2362 }
2363
2364 /*
2365  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2366  * ourselves.
2367  */
2368 static __be32
2369 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2370                 struct svc_export *exp,
2371                 struct dentry *dentry, u32 *bmval,
2372                 struct svc_rqst *rqstp, int ignore_crossmnt)
2373 {
2374         u32 bmval0 = bmval[0];
2375         u32 bmval1 = bmval[1];
2376         u32 bmval2 = bmval[2];
2377         struct kstat stat;
2378         struct svc_fh *tempfh = NULL;
2379         struct kstatfs statfs;
2380         __be32 *p;
2381         int starting_len = xdr->buf->len;
2382         int attrlen_offset;
2383         __be32 attrlen;
2384         u32 dummy;
2385         u64 dummy64;
2386         u32 rdattr_err = 0;
2387         __be32 status;
2388         int err;
2389         struct nfs4_acl *acl = NULL;
2390         void *context = NULL;
2391         int contextlen;
2392         bool contextsupport = false;
2393         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2394         u32 minorversion = resp->cstate.minorversion;
2395         struct path path = {
2396                 .mnt    = exp->ex_path.mnt,
2397                 .dentry = dentry,
2398         };
2399         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2400
2401         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2402         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2403
2404         if (exp->ex_fslocs.migrated) {
2405                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2406                 if (status)
2407                         goto out;
2408         }
2409
2410         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2411         if (err)
2412                 goto out_nfserr;
2413         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2414                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2415             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2416                        FATTR4_WORD1_SPACE_TOTAL))) {
2417                 err = vfs_statfs(&path, &statfs);
2418                 if (err)
2419                         goto out_nfserr;
2420         }
2421         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2422                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2423                 status = nfserr_jukebox;
2424                 if (!tempfh)
2425                         goto out;
2426                 fh_init(tempfh, NFS4_FHSIZE);
2427                 status = fh_compose(tempfh, exp, dentry, NULL);
2428                 if (status)
2429                         goto out;
2430                 fhp = tempfh;
2431         }
2432         if (bmval0 & FATTR4_WORD0_ACL) {
2433                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2434                 if (err == -EOPNOTSUPP)
2435                         bmval0 &= ~FATTR4_WORD0_ACL;
2436                 else if (err == -EINVAL) {
2437                         status = nfserr_attrnotsupp;
2438                         goto out;
2439                 } else if (err != 0)
2440                         goto out_nfserr;
2441         }
2442
2443 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2444         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2445              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2446                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2447                         err = security_inode_getsecctx(d_inode(dentry),
2448                                                 &context, &contextlen);
2449                 else
2450                         err = -EOPNOTSUPP;
2451                 contextsupport = (err == 0);
2452                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2453                         if (err == -EOPNOTSUPP)
2454                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2455                         else if (err)
2456                                 goto out_nfserr;
2457                 }
2458         }
2459 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2460
2461         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2462         if (status)
2463                 goto out;
2464
2465         attrlen_offset = xdr->buf->len;
2466         p = xdr_reserve_space(xdr, 4);
2467         if (!p)
2468                 goto out_resource;
2469         p++;                /* to be backfilled later */
2470
2471         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2472                 u32 supp[3];
2473
2474                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2475
2476                 if (!IS_POSIXACL(dentry->d_inode))
2477                         supp[0] &= ~FATTR4_WORD0_ACL;
2478                 if (!contextsupport)
2479                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2480                 if (!supp[2]) {
2481                         p = xdr_reserve_space(xdr, 12);
2482                         if (!p)
2483                                 goto out_resource;
2484                         *p++ = cpu_to_be32(2);
2485                         *p++ = cpu_to_be32(supp[0]);
2486                         *p++ = cpu_to_be32(supp[1]);
2487                 } else {
2488                         p = xdr_reserve_space(xdr, 16);
2489                         if (!p)
2490                                 goto out_resource;
2491                         *p++ = cpu_to_be32(3);
2492                         *p++ = cpu_to_be32(supp[0]);
2493                         *p++ = cpu_to_be32(supp[1]);
2494                         *p++ = cpu_to_be32(supp[2]);
2495                 }
2496         }
2497         if (bmval0 & FATTR4_WORD0_TYPE) {
2498                 p = xdr_reserve_space(xdr, 4);
2499                 if (!p)
2500                         goto out_resource;
2501                 dummy = nfs4_file_type(stat.mode);
2502                 if (dummy == NF4BAD) {
2503                         status = nfserr_serverfault;
2504                         goto out;
2505                 }
2506                 *p++ = cpu_to_be32(dummy);
2507         }
2508         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2509                 p = xdr_reserve_space(xdr, 4);
2510                 if (!p)
2511                         goto out_resource;
2512                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2513                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2514                 else
2515                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2516                                                 NFS4_FH_VOL_RENAME);
2517         }
2518         if (bmval0 & FATTR4_WORD0_CHANGE) {
2519                 p = xdr_reserve_space(xdr, 8);
2520                 if (!p)
2521                         goto out_resource;
2522                 p = encode_change(p, &stat, d_inode(dentry), exp);
2523         }
2524         if (bmval0 & FATTR4_WORD0_SIZE) {
2525                 p = xdr_reserve_space(xdr, 8);
2526                 if (!p)
2527                         goto out_resource;
2528                 p = xdr_encode_hyper(p, stat.size);
2529         }
2530         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2531                 p = xdr_reserve_space(xdr, 4);
2532                 if (!p)
2533                         goto out_resource;
2534                 *p++ = cpu_to_be32(1);
2535         }
2536         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2537                 p = xdr_reserve_space(xdr, 4);
2538                 if (!p)
2539                         goto out_resource;
2540                 *p++ = cpu_to_be32(1);
2541         }
2542         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2543                 p = xdr_reserve_space(xdr, 4);
2544                 if (!p)
2545                         goto out_resource;
2546                 *p++ = cpu_to_be32(0);
2547         }
2548         if (bmval0 & FATTR4_WORD0_FSID) {
2549                 p = xdr_reserve_space(xdr, 16);
2550                 if (!p)
2551                         goto out_resource;
2552                 if (exp->ex_fslocs.migrated) {
2553                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2554                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2555                 } else switch(fsid_source(fhp)) {
2556                 case FSIDSOURCE_FSID:
2557                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2558                         p = xdr_encode_hyper(p, (u64)0);
2559                         break;
2560                 case FSIDSOURCE_DEV:
2561                         *p++ = cpu_to_be32(0);
2562                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2563                         *p++ = cpu_to_be32(0);
2564                         *p++ = cpu_to_be32(MINOR(stat.dev));
2565                         break;
2566                 case FSIDSOURCE_UUID:
2567                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2568                                                                 EX_UUID_LEN);
2569                         break;
2570                 }
2571         }
2572         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2573                 p = xdr_reserve_space(xdr, 4);
2574                 if (!p)
2575                         goto out_resource;
2576                 *p++ = cpu_to_be32(0);
2577         }
2578         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2579                 p = xdr_reserve_space(xdr, 4);
2580                 if (!p)
2581                         goto out_resource;
2582                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2583         }
2584         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2585                 p = xdr_reserve_space(xdr, 4);
2586                 if (!p)
2587                         goto out_resource;
2588                 *p++ = cpu_to_be32(rdattr_err);
2589         }
2590         if (bmval0 & FATTR4_WORD0_ACL) {
2591                 struct nfs4_ace *ace;
2592
2593                 if (acl == NULL) {
2594                         p = xdr_reserve_space(xdr, 4);
2595                         if (!p)
2596                                 goto out_resource;
2597
2598                         *p++ = cpu_to_be32(0);
2599                         goto out_acl;
2600                 }
2601                 p = xdr_reserve_space(xdr, 4);
2602                 if (!p)
2603                         goto out_resource;
2604                 *p++ = cpu_to_be32(acl->naces);
2605
2606                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2607                         p = xdr_reserve_space(xdr, 4*3);
2608                         if (!p)
2609                                 goto out_resource;
2610                         *p++ = cpu_to_be32(ace->type);
2611                         *p++ = cpu_to_be32(ace->flag);
2612                         *p++ = cpu_to_be32(ace->access_mask &
2613                                                         NFS4_ACE_MASK_ALL);
2614                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2615                         if (status)
2616                                 goto out;
2617                 }
2618         }
2619 out_acl:
2620         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2621                 p = xdr_reserve_space(xdr, 4);
2622                 if (!p)
2623                         goto out_resource;
2624                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2625                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2626         }
2627         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2628                 p = xdr_reserve_space(xdr, 4);
2629                 if (!p)
2630                         goto out_resource;
2631                 *p++ = cpu_to_be32(1);
2632         }
2633         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2634                 p = xdr_reserve_space(xdr, 4);
2635                 if (!p)
2636                         goto out_resource;
2637                 *p++ = cpu_to_be32(0);
2638         }
2639         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2640                 p = xdr_reserve_space(xdr, 4);
2641                 if (!p)
2642                         goto out_resource;
2643                 *p++ = cpu_to_be32(1);
2644         }
2645         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2646                 p = xdr_reserve_space(xdr, 4);
2647                 if (!p)
2648                         goto out_resource;
2649                 *p++ = cpu_to_be32(1);
2650         }
2651         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2652                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2653                 if (!p)
2654                         goto out_resource;
2655                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2656                                         fhp->fh_handle.fh_size);
2657         }
2658         if (bmval0 & FATTR4_WORD0_FILEID) {
2659                 p = xdr_reserve_space(xdr, 8);
2660                 if (!p)
2661                         goto out_resource;
2662                 p = xdr_encode_hyper(p, stat.ino);
2663         }
2664         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2665                 p = xdr_reserve_space(xdr, 8);
2666                 if (!p)
2667                         goto out_resource;
2668                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2669         }
2670         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2671                 p = xdr_reserve_space(xdr, 8);
2672                 if (!p)
2673                         goto out_resource;
2674                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2675         }
2676         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2677                 p = xdr_reserve_space(xdr, 8);
2678                 if (!p)
2679                         goto out_resource;
2680                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2681         }
2682         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2683                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2684                 if (status)
2685                         goto out;
2686         }
2687         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2688                 p = xdr_reserve_space(xdr, 4);
2689                 if (!p)
2690                         goto out_resource;
2691                 *p++ = cpu_to_be32(1);
2692         }
2693         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2694                 p = xdr_reserve_space(xdr, 8);
2695                 if (!p)
2696                         goto out_resource;
2697                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2698         }
2699         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2700                 p = xdr_reserve_space(xdr, 4);
2701                 if (!p)
2702                         goto out_resource;
2703                 *p++ = cpu_to_be32(255);
2704         }
2705         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2706                 p = xdr_reserve_space(xdr, 4);
2707                 if (!p)
2708                         goto out_resource;
2709                 *p++ = cpu_to_be32(statfs.f_namelen);
2710         }
2711         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2712                 p = xdr_reserve_space(xdr, 8);
2713                 if (!p)
2714                         goto out_resource;
2715                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2716         }
2717         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2718                 p = xdr_reserve_space(xdr, 8);
2719                 if (!p)
2720                         goto out_resource;
2721                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2722         }
2723         if (bmval1 & FATTR4_WORD1_MODE) {
2724                 p = xdr_reserve_space(xdr, 4);
2725                 if (!p)
2726                         goto out_resource;
2727                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2728         }
2729         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2730                 p = xdr_reserve_space(xdr, 4);
2731                 if (!p)
2732                         goto out_resource;
2733                 *p++ = cpu_to_be32(1);
2734         }
2735         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2736                 p = xdr_reserve_space(xdr, 4);
2737                 if (!p)
2738                         goto out_resource;
2739                 *p++ = cpu_to_be32(stat.nlink);
2740         }
2741         if (bmval1 & FATTR4_WORD1_OWNER) {
2742                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2743                 if (status)
2744                         goto out;
2745         }
2746         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2747                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2748                 if (status)
2749                         goto out;
2750         }
2751         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2752                 p = xdr_reserve_space(xdr, 8);
2753                 if (!p)
2754                         goto out_resource;
2755                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2756                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2757         }
2758         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2759                 p = xdr_reserve_space(xdr, 8);
2760                 if (!p)
2761                         goto out_resource;
2762                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2763                 p = xdr_encode_hyper(p, dummy64);
2764         }
2765         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2766                 p = xdr_reserve_space(xdr, 8);
2767                 if (!p)
2768                         goto out_resource;
2769                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2770                 p = xdr_encode_hyper(p, dummy64);
2771         }
2772         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2773                 p = xdr_reserve_space(xdr, 8);
2774                 if (!p)
2775                         goto out_resource;
2776                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2777                 p = xdr_encode_hyper(p, dummy64);
2778         }
2779         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2780                 p = xdr_reserve_space(xdr, 8);
2781                 if (!p)
2782                         goto out_resource;
2783                 dummy64 = (u64)stat.blocks << 9;
2784                 p = xdr_encode_hyper(p, dummy64);
2785         }
2786         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2787                 p = xdr_reserve_space(xdr, 12);
2788                 if (!p)
2789                         goto out_resource;
2790                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2791                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2792         }
2793         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2794                 p = xdr_reserve_space(xdr, 12);
2795                 if (!p)
2796                         goto out_resource;
2797                 *p++ = cpu_to_be32(0);
2798                 *p++ = cpu_to_be32(1);
2799                 *p++ = cpu_to_be32(0);
2800         }
2801         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2802                 p = xdr_reserve_space(xdr, 12);
2803                 if (!p)
2804                         goto out_resource;
2805                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2806                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2807         }
2808         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2809                 p = xdr_reserve_space(xdr, 12);
2810                 if (!p)
2811                         goto out_resource;
2812                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2813                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2814         }
2815         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2816                 struct kstat parent_stat;
2817                 u64 ino = stat.ino;
2818
2819                 p = xdr_reserve_space(xdr, 8);
2820                 if (!p)
2821                         goto out_resource;
2822                 /*
2823                  * Get parent's attributes if not ignoring crossmount
2824                  * and this is the root of a cross-mounted filesystem.
2825                  */
2826                 if (ignore_crossmnt == 0 &&
2827                     dentry == exp->ex_path.mnt->mnt_root) {
2828                         err = get_parent_attributes(exp, &parent_stat);
2829                         if (err)
2830                                 goto out_nfserr;
2831                         ino = parent_stat.ino;
2832                 }
2833                 p = xdr_encode_hyper(p, ino);
2834         }
2835 #ifdef CONFIG_NFSD_PNFS
2836         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2837                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2838                 if (status)
2839                         goto out;
2840         }
2841
2842         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2843                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2844                 if (status)
2845                         goto out;
2846         }
2847
2848         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2849                 p = xdr_reserve_space(xdr, 4);
2850                 if (!p)
2851                         goto out_resource;
2852                 *p++ = cpu_to_be32(stat.blksize);
2853         }
2854 #endif /* CONFIG_NFSD_PNFS */
2855         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2856                 u32 supp[3];
2857
2858                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2859                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2860                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2861                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2862
2863                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2864                 if (status)
2865                         goto out;
2866         }
2867
2868         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2869                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2870                                                                 contextlen);
2871                 if (status)
2872                         goto out;
2873         }
2874
2875         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2876         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2877         status = nfs_ok;
2878
2879 out:
2880 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2881         if (context)
2882                 security_release_secctx(context, contextlen);
2883 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2884         kfree(acl);
2885         if (tempfh) {
2886                 fh_put(tempfh);
2887                 kfree(tempfh);
2888         }
2889         if (status)
2890                 xdr_truncate_encode(xdr, starting_len);
2891         return status;
2892 out_nfserr:
2893         status = nfserrno(err);
2894         goto out;
2895 out_resource:
2896         status = nfserr_resource;
2897         goto out;
2898 }
2899
2900 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2901                                 struct xdr_buf *buf, __be32 *p, int bytes)
2902 {
2903         xdr->scratch.iov_len = 0;
2904         memset(buf, 0, sizeof(struct xdr_buf));
2905         buf->head[0].iov_base = p;
2906         buf->head[0].iov_len = 0;
2907         buf->len = 0;
2908         xdr->buf = buf;
2909         xdr->iov = buf->head;
2910         xdr->p = p;
2911         xdr->end = (void *)p + bytes;
2912         buf->buflen = bytes;
2913 }
2914
2915 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2916                         struct svc_fh *fhp, struct svc_export *exp,
2917                         struct dentry *dentry, u32 *bmval,
2918                         struct svc_rqst *rqstp, int ignore_crossmnt)
2919 {
2920         struct xdr_buf dummy;
2921         struct xdr_stream xdr;
2922         __be32 ret;
2923
2924         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2925         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2926                                                         ignore_crossmnt);
2927         *p = xdr.p;
2928         return ret;
2929 }
2930
2931 static inline int attributes_need_mount(u32 *bmval)
2932 {
2933         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2934                 return 1;
2935         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2936                 return 1;
2937         return 0;
2938 }
2939
2940 static __be32
2941 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2942                         const char *name, int namlen)
2943 {
2944         struct svc_export *exp = cd->rd_fhp->fh_export;
2945         struct dentry *dentry;
2946         __be32 nfserr;
2947         int ignore_crossmnt = 0;
2948
2949         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2950         if (IS_ERR(dentry))
2951                 return nfserrno(PTR_ERR(dentry));
2952         if (d_really_is_negative(dentry)) {
2953                 /*
2954                  * we're not holding the i_mutex here, so there's
2955                  * a window where this directory entry could have gone
2956                  * away.
2957                  */
2958                 dput(dentry);
2959                 return nfserr_noent;
2960         }
2961
2962         exp_get(exp);
2963         /*
2964          * In the case of a mountpoint, the client may be asking for
2965          * attributes that are only properties of the underlying filesystem
2966          * as opposed to the cross-mounted file system. In such a case,
2967          * we will not follow the cross mount and will fill the attribtutes
2968          * directly from the mountpoint dentry.
2969          */
2970         if (nfsd_mountpoint(dentry, exp)) {
2971                 int err;
2972
2973                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2974                                 && !attributes_need_mount(cd->rd_bmval)) {
2975                         ignore_crossmnt = 1;
2976                         goto out_encode;
2977                 }
2978                 /*
2979                  * Why the heck aren't we just using nfsd_lookup??
2980                  * Different "."/".." handling?  Something else?
2981                  * At least, add a comment here to explain....
2982                  */
2983                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2984                 if (err) {
2985                         nfserr = nfserrno(err);
2986                         goto out_put;
2987                 }
2988                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2989                 if (nfserr)
2990                         goto out_put;
2991
2992         }
2993 out_encode:
2994         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2995                                         cd->rd_rqstp, ignore_crossmnt);
2996 out_put:
2997         dput(dentry);
2998         exp_put(exp);
2999         return nfserr;
3000 }
3001
3002 static __be32 *
3003 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3004 {
3005         __be32 *p;
3006
3007         p = xdr_reserve_space(xdr, 20);
3008         if (!p)
3009                 return NULL;
3010         *p++ = htonl(2);
3011         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3012         *p++ = htonl(0);                         /* bmval1 */
3013
3014         *p++ = htonl(4);     /* attribute length */
3015         *p++ = nfserr;       /* no htonl */
3016         return p;
3017 }
3018
3019 static int
3020 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3021                     loff_t offset, u64 ino, unsigned int d_type)
3022 {
3023         struct readdir_cd *ccd = ccdv;
3024         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3025         struct xdr_stream *xdr = cd->xdr;
3026         int start_offset = xdr->buf->len;
3027         int cookie_offset;
3028         u32 name_and_cookie;
3029         int entry_bytes;
3030         __be32 nfserr = nfserr_toosmall;
3031         __be64 wire_offset;
3032         __be32 *p;
3033
3034         /* In nfsv4, "." and ".." never make it onto the wire.. */
3035         if (name && isdotent(name, namlen)) {
3036                 cd->common.err = nfs_ok;
3037                 return 0;
3038         }
3039
3040         if (cd->cookie_offset) {
3041                 wire_offset = cpu_to_be64(offset);
3042                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3043                                                         &wire_offset, 8);
3044         }
3045
3046         p = xdr_reserve_space(xdr, 4);
3047         if (!p)
3048                 goto fail;
3049         *p++ = xdr_one;                             /* mark entry present */
3050         cookie_offset = xdr->buf->len;
3051         p = xdr_reserve_space(xdr, 3*4 + namlen);
3052         if (!p)
3053                 goto fail;
3054         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3055         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3056
3057         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3058         switch (nfserr) {
3059         case nfs_ok:
3060                 break;
3061         case nfserr_resource:
3062                 nfserr = nfserr_toosmall;
3063                 goto fail;
3064         case nfserr_noent:
3065                 xdr_truncate_encode(xdr, start_offset);
3066                 goto skip_entry;
3067         default:
3068                 /*
3069                  * If the client requested the RDATTR_ERROR attribute,
3070                  * we stuff the error code into this attribute
3071                  * and continue.  If this attribute was not requested,
3072                  * then in accordance with the spec, we fail the
3073                  * entire READDIR operation(!)
3074                  */
3075                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3076                         goto fail;
3077                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3078                 if (p == NULL) {
3079                         nfserr = nfserr_toosmall;
3080                         goto fail;
3081                 }
3082         }
3083         nfserr = nfserr_toosmall;
3084         entry_bytes = xdr->buf->len - start_offset;
3085         if (entry_bytes > cd->rd_maxcount)
3086                 goto fail;
3087         cd->rd_maxcount -= entry_bytes;
3088         /*
3089          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3090          * let's always let through the first entry, at least:
3091          */
3092         if (!cd->rd_dircount)
3093                 goto fail;
3094         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3095         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3096                 goto fail;
3097         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3098
3099         cd->cookie_offset = cookie_offset;
3100 skip_entry:
3101         cd->common.err = nfs_ok;
3102         return 0;
3103 fail:
3104         xdr_truncate_encode(xdr, start_offset);
3105         cd->common.err = nfserr;
3106         return -EINVAL;
3107 }
3108
3109 static __be32
3110 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3111 {
3112         __be32 *p;
3113
3114         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3115         if (!p)
3116                 return nfserr_resource;
3117         *p++ = cpu_to_be32(sid->si_generation);
3118         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3119                                         sizeof(stateid_opaque_t));
3120         return 0;
3121 }
3122
3123 static __be32
3124 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3125 {
3126         struct xdr_stream *xdr = &resp->xdr;
3127         __be32 *p;
3128
3129         p = xdr_reserve_space(xdr, 8);
3130         if (!p)
3131                 return nfserr_resource;
3132         *p++ = cpu_to_be32(access->ac_supported);
3133         *p++ = cpu_to_be32(access->ac_resp_access);
3134         return 0;
3135 }
3136
3137 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3138 {
3139         struct xdr_stream *xdr = &resp->xdr;
3140         __be32 *p;
3141
3142         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3143         if (!p)
3144                 return nfserr_resource;
3145         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3146                                         NFS4_MAX_SESSIONID_LEN);
3147         *p++ = cpu_to_be32(bcts->dir);
3148         /* Upshifting from TCP to RDMA is not supported */
3149         *p++ = cpu_to_be32(0);
3150         return 0;
3151 }
3152
3153 static __be32
3154 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3155 {
3156         struct xdr_stream *xdr = &resp->xdr;
3157
3158         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3159 }
3160
3161
3162 static __be32
3163 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3164 {
3165         struct xdr_stream *xdr = &resp->xdr;
3166         __be32 *p;
3167
3168         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3169         if (!p)
3170                 return nfserr_resource;
3171         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3172                                                 NFS4_VERIFIER_SIZE);
3173         return 0;
3174 }
3175
3176 static __be32
3177 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3178 {
3179         struct xdr_stream *xdr = &resp->xdr;
3180         __be32 *p;
3181
3182         p = xdr_reserve_space(xdr, 20);
3183         if (!p)
3184                 return nfserr_resource;
3185         encode_cinfo(p, &create->cr_cinfo);
3186         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3187                         create->cr_bmval[1], create->cr_bmval[2]);
3188         return 0;
3189 }
3190
3191 static __be32
3192 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3193 {
3194         struct svc_fh *fhp = getattr->ga_fhp;
3195         struct xdr_stream *xdr = &resp->xdr;
3196
3197         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3198                                     getattr->ga_bmval, resp->rqstp, 0);
3199 }
3200
3201 static __be32
3202 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3203 {
3204         struct xdr_stream *xdr = &resp->xdr;
3205         struct svc_fh *fhp = *fhpp;
3206         unsigned int len;
3207         __be32 *p;
3208
3209         len = fhp->fh_handle.fh_size;
3210         p = xdr_reserve_space(xdr, len + 4);
3211         if (!p)
3212                 return nfserr_resource;
3213         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3214         return 0;
3215 }
3216
3217 /*
3218 * Including all fields other than the name, a LOCK4denied structure requires
3219 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3220 */
3221 static __be32
3222 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3223 {
3224         struct xdr_netobj *conf = &ld->ld_owner;
3225         __be32 *p;
3226
3227 again:
3228         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3229         if (!p) {
3230                 /*
3231                  * Don't fail to return the result just because we can't
3232                  * return the conflicting open:
3233                  */
3234                 if (conf->len) {
3235                         kfree(conf->data);
3236                         conf->len = 0;
3237                         conf->data = NULL;
3238                         goto again;
3239                 }
3240                 return nfserr_resource;
3241         }
3242         p = xdr_encode_hyper(p, ld->ld_start);
3243         p = xdr_encode_hyper(p, ld->ld_length);
3244         *p++ = cpu_to_be32(ld->ld_type);
3245         if (conf->len) {
3246                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3247                 p = xdr_encode_opaque(p, conf->data, conf->len);
3248                 kfree(conf->data);
3249         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3250                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3251                 *p++ = cpu_to_be32(0); /* length of owner name */
3252         }
3253         return nfserr_denied;
3254 }
3255
3256 static __be32
3257 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3258 {
3259         struct xdr_stream *xdr = &resp->xdr;
3260
3261         if (!nfserr)
3262                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3263         else if (nfserr == nfserr_denied)
3264                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3265
3266         return nfserr;
3267 }
3268
3269 static __be32
3270 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3271 {
3272         struct xdr_stream *xdr = &resp->xdr;
3273
3274         if (nfserr == nfserr_denied)
3275                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3276         return nfserr;
3277 }
3278
3279 static __be32
3280 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3281 {
3282         struct xdr_stream *xdr = &resp->xdr;
3283
3284         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3285 }
3286
3287
3288 static __be32
3289 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3290 {
3291         struct xdr_stream *xdr = &resp->xdr;
3292         __be32 *p;
3293
3294         p = xdr_reserve_space(xdr, 20);
3295         if (!p)
3296                 return nfserr_resource;
3297         p = encode_cinfo(p, &link->li_cinfo);
3298         return 0;
3299 }
3300
3301
3302 static __be32
3303 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3304 {
3305         struct xdr_stream *xdr = &resp->xdr;
3306         __be32 *p;
3307
3308         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3309         if (nfserr)
3310                 return nfserr;
3311         p = xdr_reserve_space(xdr, 24);
3312         if (!p)
3313                 return nfserr_resource;
3314         p = encode_cinfo(p, &open->op_cinfo);
3315         *p++ = cpu_to_be32(open->op_rflags);
3316
3317         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3318                                         open->op_bmval[2]);
3319         if (nfserr)
3320                 return nfserr;
3321
3322         p = xdr_reserve_space(xdr, 4);
3323         if (!p)
3324                 return nfserr_resource;
3325
3326         *p++ = cpu_to_be32(open->op_delegate_type);
3327         switch (open->op_delegate_type) {
3328         case NFS4_OPEN_DELEGATE_NONE:
3329                 break;
3330         case NFS4_OPEN_DELEGATE_READ:
3331                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3332                 if (nfserr)
3333                         return nfserr;
3334                 p = xdr_reserve_space(xdr, 20);
3335                 if (!p)
3336                         return nfserr_resource;
3337                 *p++ = cpu_to_be32(open->op_recall);
3338
3339                 /*
3340                  * TODO: ACE's in delegations
3341                  */
3342                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3343                 *p++ = cpu_to_be32(0);
3344                 *p++ = cpu_to_be32(0);
3345                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3346                 break;
3347         case NFS4_OPEN_DELEGATE_WRITE:
3348                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3349                 if (nfserr)
3350                         return nfserr;
3351                 p = xdr_reserve_space(xdr, 32);
3352                 if (!p)
3353                         return nfserr_resource;
3354                 *p++ = cpu_to_be32(0);
3355
3356                 /*
3357                  * TODO: space_limit's in delegations
3358                  */
3359                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3360                 *p++ = cpu_to_be32(~(u32)0);
3361                 *p++ = cpu_to_be32(~(u32)0);
3362
3363                 /*
3364                  * TODO: ACE's in delegations
3365                  */
3366                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3367                 *p++ = cpu_to_be32(0);
3368                 *p++ = cpu_to_be32(0);
3369                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3370                 break;
3371         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3372                 switch (open->op_why_no_deleg) {
3373                 case WND4_CONTENTION:
3374                 case WND4_RESOURCE:
3375                         p = xdr_reserve_space(xdr, 8);
3376                         if (!p)
3377                                 return nfserr_resource;
3378                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3379                         /* deleg signaling not supported yet: */
3380                         *p++ = cpu_to_be32(0);
3381                         break;
3382                 default:
3383                         p = xdr_reserve_space(xdr, 4);
3384                         if (!p)
3385                                 return nfserr_resource;
3386                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3387                 }
3388                 break;
3389         default:
3390                 BUG();
3391         }
3392         /* XXX save filehandle here */
3393         return 0;
3394 }
3395
3396 static __be32
3397 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3398 {
3399         struct xdr_stream *xdr = &resp->xdr;
3400
3401         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3402 }
3403
3404 static __be32
3405 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3406 {
3407         struct xdr_stream *xdr = &resp->xdr;
3408
3409         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3410 }
3411
3412 static __be32 nfsd4_encode_splice_read(
3413                                 struct nfsd4_compoundres *resp,
3414                                 struct nfsd4_read *read,
3415                                 struct file *file, unsigned long maxcount)
3416 {
3417         struct xdr_stream *xdr = &resp->xdr;
3418         struct xdr_buf *buf = xdr->buf;
3419         u32 eof;
3420         long len;
3421         int space_left;
3422         __be32 nfserr;
3423         __be32 *p = xdr->p - 2;
3424
3425         /* Make sure there will be room for padding if needed */
3426         if (xdr->end - xdr->p < 1)
3427                 return nfserr_resource;
3428
3429         len = maxcount;
3430         nfserr = nfsd_splice_read(read->rd_rqstp, file,
3431                                   read->rd_offset, &maxcount);
3432         if (nfserr) {
3433                 /*
3434                  * nfsd_splice_actor may have already messed with the
3435                  * page length; reset it so as not to confuse
3436                  * xdr_truncate_encode:
3437                  */
3438                 buf->page_len = 0;
3439                 return nfserr;
3440         }
3441
3442         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3443                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3444
3445         *(p++) = htonl(eof);
3446         *(p++) = htonl(maxcount);
3447
3448         buf->page_len = maxcount;
3449         buf->len += maxcount;
3450         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3451                                                         / PAGE_SIZE;
3452
3453         /* Use rest of head for padding and remaining ops: */
3454         buf->tail[0].iov_base = xdr->p;