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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/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/statfs.h>
40 #include <linux/utsname.h>
41 #include <linux/pagemap.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43
44 #include "idmap.h"
45 #include "acl.h"
46 #include "xdr4.h"
47 #include "vfs.h"
48 #include "state.h"
49 #include "cache.h"
50 #include "netns.h"
51 #include "pnfs.h"
52
53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
54 #include <linux/security.h>
55 #endif
56
57
58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
59
60 const u32 nfsd_suppattrs[3][3] = {
61         {NFSD4_SUPPORTED_ATTRS_WORD0,
62          NFSD4_SUPPORTED_ATTRS_WORD1,
63          NFSD4_SUPPORTED_ATTRS_WORD2},
64
65         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
66          NFSD4_1_SUPPORTED_ATTRS_WORD1,
67          NFSD4_1_SUPPORTED_ATTRS_WORD2},
68
69         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
70          NFSD4_1_SUPPORTED_ATTRS_WORD1,
71          NFSD4_2_SUPPORTED_ATTRS_WORD2},
72 };
73
74 /*
75  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
76  * directory in order to indicate to the client that a filesystem boundary is present
77  * We use a fixed fsid for a referral
78  */
79 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
80 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
81
82 static __be32
83 check_filename(char *str, int len)
84 {
85         int i;
86
87         if (len == 0)
88                 return nfserr_inval;
89         if (isdotent(str, len))
90                 return nfserr_badname;
91         for (i = 0; i < len; i++)
92                 if (str[i] == '/')
93                         return nfserr_badname;
94         return 0;
95 }
96
97 #define DECODE_HEAD                             \
98         __be32 *p;                              \
99         __be32 status
100 #define DECODE_TAIL                             \
101         status = 0;                             \
102 out:                                            \
103         return status;                          \
104 xdr_error:                                      \
105         dprintk("NFSD: xdr error (%s:%d)\n",    \
106                         __FILE__, __LINE__);    \
107         status = nfserr_bad_xdr;                \
108         goto out
109
110 #define READMEM(x,nbytes) do {                  \
111         x = (char *)p;                          \
112         p += XDR_QUADLEN(nbytes);               \
113 } while (0)
114 #define SAVEMEM(x,nbytes) do {                  \
115         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
116                 savemem(argp, p, nbytes) :      \
117                 (char *)p)) {                   \
118                 dprintk("NFSD: xdr error (%s:%d)\n", \
119                                 __FILE__, __LINE__); \
120                 goto xdr_error;                 \
121                 }                               \
122         p += XDR_QUADLEN(nbytes);               \
123 } while (0)
124 #define COPYMEM(x,nbytes) do {                  \
125         memcpy((x), p, nbytes);                 \
126         p += XDR_QUADLEN(nbytes);               \
127 } while (0)
128
129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
130 #define READ_BUF(nbytes)  do {                  \
131         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
132                 p = argp->p;                    \
133                 argp->p += XDR_QUADLEN(nbytes); \
134         } else if (!(p = read_buf(argp, nbytes))) { \
135                 dprintk("NFSD: xdr error (%s:%d)\n", \
136                                 __FILE__, __LINE__); \
137                 goto xdr_error;                 \
138         }                                       \
139 } while (0)
140
141 static void next_decode_page(struct nfsd4_compoundargs *argp)
142 {
143         argp->p = page_address(argp->pagelist[0]);
144         argp->pagelist++;
145         if (argp->pagelen < PAGE_SIZE) {
146                 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
147                 argp->pagelen = 0;
148         } else {
149                 argp->end = argp->p + (PAGE_SIZE>>2);
150                 argp->pagelen -= PAGE_SIZE;
151         }
152 }
153
154 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
155 {
156         /* We want more bytes than seem to be available.
157          * Maybe we need a new page, maybe we have just run out
158          */
159         unsigned int avail = (char *)argp->end - (char *)argp->p;
160         __be32 *p;
161
162         if (argp->pagelen == 0) {
163                 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
164
165                 if (!argp->tail) {
166                         argp->tail = true;
167                         avail = vec->iov_len;
168                         argp->p = vec->iov_base;
169                         argp->end = vec->iov_base + avail;
170                 }
171
172                 if (avail < nbytes)
173                         return NULL;
174
175                 p = argp->p;
176                 argp->p += XDR_QUADLEN(nbytes);
177                 return p;
178         }
179
180         if (avail + argp->pagelen < nbytes)
181                 return NULL;
182         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
183                 return NULL;
184         /* ok, we can do it with the current plus the next page */
185         if (nbytes <= sizeof(argp->tmp))
186                 p = argp->tmp;
187         else {
188                 kfree(argp->tmpp);
189                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
190                 if (!p)
191                         return NULL;
192                 
193         }
194         /*
195          * The following memcpy is safe because read_buf is always
196          * called with nbytes > avail, and the two cases above both
197          * guarantee p points to at least nbytes bytes.
198          */
199         memcpy(p, argp->p, avail);
200         next_decode_page(argp);
201         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
202         argp->p += XDR_QUADLEN(nbytes - avail);
203         return p;
204 }
205
206 static int zero_clientid(clientid_t *clid)
207 {
208         return (clid->cl_boot == 0) && (clid->cl_id == 0);
209 }
210
211 /**
212  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
213  * @argp: NFSv4 compound argument structure
214  * @p: pointer to be freed (with kfree())
215  *
216  * Marks @p to be freed when processing the compound operation
217  * described in @argp finishes.
218  */
219 static void *
220 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
221 {
222         struct svcxdr_tmpbuf *tb;
223
224         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
225         if (!tb)
226                 return NULL;
227         tb->next = argp->to_free;
228         argp->to_free = tb;
229         return tb->buf;
230 }
231
232 /*
233  * For xdr strings that need to be passed to other kernel api's
234  * as null-terminated strings.
235  *
236  * Note null-terminating in place usually isn't safe since the
237  * buffer might end on a page boundary.
238  */
239 static char *
240 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
241 {
242         char *p = svcxdr_tmpalloc(argp, len + 1);
243
244         if (!p)
245                 return NULL;
246         memcpy(p, buf, len);
247         p[len] = '\0';
248         return p;
249 }
250
251 /**
252  * savemem - duplicate a chunk of memory for later processing
253  * @argp: NFSv4 compound argument structure to be freed with
254  * @p: pointer to be duplicated
255  * @nbytes: length to be duplicated
256  *
257  * Returns a pointer to a copy of @nbytes bytes of memory at @p
258  * that are preserved until processing of the NFSv4 compound
259  * operation described by @argp finishes.
260  */
261 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
262 {
263         void *ret;
264
265         ret = svcxdr_tmpalloc(argp, nbytes);
266         if (!ret)
267                 return NULL;
268         memcpy(ret, p, nbytes);
269         return ret;
270 }
271
272 /*
273  * We require the high 32 bits of 'seconds' to be 0, and
274  * we ignore all 32 bits of 'nseconds'.
275  */
276 static __be32
277 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
278 {
279         DECODE_HEAD;
280         u64 sec;
281
282         READ_BUF(12);
283         p = xdr_decode_hyper(p, &sec);
284         tv->tv_sec = sec;
285         tv->tv_nsec = be32_to_cpup(p++);
286         if (tv->tv_nsec >= (u32)1000000000)
287                 return nfserr_inval;
288
289         DECODE_TAIL;
290 }
291
292 static __be32
293 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
294 {
295         u32 bmlen;
296         DECODE_HEAD;
297
298         bmval[0] = 0;
299         bmval[1] = 0;
300         bmval[2] = 0;
301
302         READ_BUF(4);
303         bmlen = be32_to_cpup(p++);
304         if (bmlen > 1000)
305                 goto xdr_error;
306
307         READ_BUF(bmlen << 2);
308         if (bmlen > 0)
309                 bmval[0] = be32_to_cpup(p++);
310         if (bmlen > 1)
311                 bmval[1] = be32_to_cpup(p++);
312         if (bmlen > 2)
313                 bmval[2] = be32_to_cpup(p++);
314
315         DECODE_TAIL;
316 }
317
318 static __be32
319 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
320                    struct iattr *iattr, struct nfs4_acl **acl,
321                    struct xdr_netobj *label, int *umask)
322 {
323         struct timespec ts;
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, &ts);
426                         iattr->ia_atime = timespec_to_timespec64(ts);
427                         if (status)
428                                 return status;
429                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
430                         break;
431                 case NFS4_SET_TO_SERVER_TIME:
432                         iattr->ia_valid |= ATTR_ATIME;
433                         break;
434                 default:
435                         goto xdr_error;
436                 }
437         }
438         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
439                 READ_BUF(4);
440                 len += 4;
441                 dummy32 = be32_to_cpup(p++);
442                 switch (dummy32) {
443                 case NFS4_SET_TO_CLIENT_TIME:
444                         len += 12;
445                         status = nfsd4_decode_time(argp, &ts);
446                         iattr->ia_mtime = timespec_to_timespec64(ts);
447                         if (status)
448                                 return status;
449                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
450                         break;
451                 case NFS4_SET_TO_SERVER_TIME:
452                         iattr->ia_valid |= ATTR_MTIME;
453                         break;
454                 default:
455                         goto xdr_error;
456                 }
457         }
458
459         label->len = 0;
460         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
461             bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
462                 READ_BUF(4);
463                 len += 4;
464                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
465                 READ_BUF(4);
466                 len += 4;
467                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
468                 READ_BUF(4);
469                 len += 4;
470                 dummy32 = be32_to_cpup(p++);
471                 READ_BUF(dummy32);
472                 if (dummy32 > NFS4_MAXLABELLEN)
473                         return nfserr_badlabel;
474                 len += (XDR_QUADLEN(dummy32) << 2);
475                 READMEM(buf, dummy32);
476                 label->len = dummy32;
477                 label->data = svcxdr_dupstr(argp, buf, dummy32);
478                 if (!label->data)
479                         return nfserr_jukebox;
480         }
481         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
482                 if (!umask)
483                         goto xdr_error;
484                 READ_BUF(8);
485                 len += 8;
486                 dummy32 = be32_to_cpup(p++);
487                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
488                 dummy32 = be32_to_cpup(p++);
489                 *umask = dummy32 & S_IRWXUGO;
490                 iattr->ia_valid |= ATTR_MODE;
491         }
492         if (len != expected_len)
493                 goto xdr_error;
494
495         DECODE_TAIL;
496 }
497
498 static __be32
499 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
500 {
501         DECODE_HEAD;
502
503         READ_BUF(sizeof(stateid_t));
504         sid->si_generation = be32_to_cpup(p++);
505         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
506
507         DECODE_TAIL;
508 }
509
510 static __be32
511 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
512 {
513         DECODE_HEAD;
514
515         READ_BUF(4);
516         access->ac_req_access = be32_to_cpup(p++);
517
518         DECODE_TAIL;
519 }
520
521 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
522 {
523         DECODE_HEAD;
524         u32 dummy, uid, gid;
525         char *machine_name;
526         int i;
527         int nr_secflavs;
528
529         /* callback_sec_params4 */
530         READ_BUF(4);
531         nr_secflavs = be32_to_cpup(p++);
532         if (nr_secflavs)
533                 cbs->flavor = (u32)(-1);
534         else
535                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
536                 cbs->flavor = 0;
537         for (i = 0; i < nr_secflavs; ++i) {
538                 READ_BUF(4);
539                 dummy = be32_to_cpup(p++);
540                 switch (dummy) {
541                 case RPC_AUTH_NULL:
542                         /* Nothing to read */
543                         if (cbs->flavor == (u32)(-1))
544                                 cbs->flavor = RPC_AUTH_NULL;
545                         break;
546                 case RPC_AUTH_UNIX:
547                         READ_BUF(8);
548                         /* stamp */
549                         dummy = be32_to_cpup(p++);
550
551                         /* machine name */
552                         dummy = be32_to_cpup(p++);
553                         READ_BUF(dummy);
554                         SAVEMEM(machine_name, dummy);
555
556                         /* uid, gid */
557                         READ_BUF(8);
558                         uid = be32_to_cpup(p++);
559                         gid = be32_to_cpup(p++);
560
561                         /* more gids */
562                         READ_BUF(4);
563                         dummy = be32_to_cpup(p++);
564                         READ_BUF(dummy * 4);
565                         if (cbs->flavor == (u32)(-1)) {
566                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
567                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
568                                 if (uid_valid(kuid) && gid_valid(kgid)) {
569                                         cbs->uid = kuid;
570                                         cbs->gid = kgid;
571                                         cbs->flavor = RPC_AUTH_UNIX;
572                                 } else {
573                                         dprintk("RPC_AUTH_UNIX with invalid"
574                                                 "uid or gid ignoring!\n");
575                                 }
576                         }
577                         break;
578                 case RPC_AUTH_GSS:
579                         dprintk("RPC_AUTH_GSS callback secflavor "
580                                 "not supported!\n");
581                         READ_BUF(8);
582                         /* gcbp_service */
583                         dummy = be32_to_cpup(p++);
584                         /* gcbp_handle_from_server */
585                         dummy = be32_to_cpup(p++);
586                         READ_BUF(dummy);
587                         p += XDR_QUADLEN(dummy);
588                         /* gcbp_handle_from_client */
589                         READ_BUF(4);
590                         dummy = be32_to_cpup(p++);
591                         READ_BUF(dummy);
592                         break;
593                 default:
594                         dprintk("Illegal callback secflavor\n");
595                         return nfserr_inval;
596                 }
597         }
598         DECODE_TAIL;
599 }
600
601 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
602 {
603         DECODE_HEAD;
604
605         READ_BUF(4);
606         bc->bc_cb_program = be32_to_cpup(p++);
607         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
608
609         DECODE_TAIL;
610 }
611
612 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
613 {
614         DECODE_HEAD;
615
616         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
617         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
618         bcts->dir = be32_to_cpup(p++);
619         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
620          * could help us figure out we should be using it. */
621         DECODE_TAIL;
622 }
623
624 static __be32
625 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
626 {
627         DECODE_HEAD;
628
629         READ_BUF(4);
630         close->cl_seqid = be32_to_cpup(p++);
631         return nfsd4_decode_stateid(argp, &close->cl_stateid);
632
633         DECODE_TAIL;
634 }
635
636
637 static __be32
638 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
639 {
640         DECODE_HEAD;
641
642         READ_BUF(12);
643         p = xdr_decode_hyper(p, &commit->co_offset);
644         commit->co_count = be32_to_cpup(p++);
645
646         DECODE_TAIL;
647 }
648
649 static __be32
650 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
651 {
652         DECODE_HEAD;
653
654         READ_BUF(4);
655         create->cr_type = be32_to_cpup(p++);
656         switch (create->cr_type) {
657         case NF4LNK:
658                 READ_BUF(4);
659                 create->cr_datalen = be32_to_cpup(p++);
660                 READ_BUF(create->cr_datalen);
661                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
662                 if (!create->cr_data)
663                         return nfserr_jukebox;
664                 break;
665         case NF4BLK:
666         case NF4CHR:
667                 READ_BUF(8);
668                 create->cr_specdata1 = be32_to_cpup(p++);
669                 create->cr_specdata2 = be32_to_cpup(p++);
670                 break;
671         case NF4SOCK:
672         case NF4FIFO:
673         case NF4DIR:
674         default:
675                 break;
676         }
677
678         READ_BUF(4);
679         create->cr_namelen = be32_to_cpup(p++);
680         READ_BUF(create->cr_namelen);
681         SAVEMEM(create->cr_name, create->cr_namelen);
682         if ((status = check_filename(create->cr_name, create->cr_namelen)))
683                 return status;
684
685         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
686                                     &create->cr_acl, &create->cr_label,
687                                     &create->cr_umask);
688         if (status)
689                 goto out;
690
691         DECODE_TAIL;
692 }
693
694 static inline __be32
695 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
696 {
697         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
698 }
699
700 static inline __be32
701 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
702 {
703         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
704 }
705
706 static __be32
707 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
708 {
709         DECODE_HEAD;
710
711         READ_BUF(4);
712         link->li_namelen = be32_to_cpup(p++);
713         READ_BUF(link->li_namelen);
714         SAVEMEM(link->li_name, link->li_namelen);
715         if ((status = check_filename(link->li_name, link->li_namelen)))
716                 return status;
717
718         DECODE_TAIL;
719 }
720
721 static __be32
722 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
723 {
724         DECODE_HEAD;
725
726         /*
727         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
728         */
729         READ_BUF(28);
730         lock->lk_type = be32_to_cpup(p++);
731         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
732                 goto xdr_error;
733         lock->lk_reclaim = be32_to_cpup(p++);
734         p = xdr_decode_hyper(p, &lock->lk_offset);
735         p = xdr_decode_hyper(p, &lock->lk_length);
736         lock->lk_is_new = be32_to_cpup(p++);
737
738         if (lock->lk_is_new) {
739                 READ_BUF(4);
740                 lock->lk_new_open_seqid = be32_to_cpup(p++);
741                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
742                 if (status)
743                         return status;
744                 READ_BUF(8 + sizeof(clientid_t));
745                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
746                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
747                 lock->lk_new_owner.len = be32_to_cpup(p++);
748                 READ_BUF(lock->lk_new_owner.len);
749                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
750         } else {
751                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
752                 if (status)
753                         return status;
754                 READ_BUF(4);
755                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
756         }
757
758         DECODE_TAIL;
759 }
760
761 static __be32
762 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
763 {
764         DECODE_HEAD;
765                         
766         READ_BUF(32);
767         lockt->lt_type = be32_to_cpup(p++);
768         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
769                 goto xdr_error;
770         p = xdr_decode_hyper(p, &lockt->lt_offset);
771         p = xdr_decode_hyper(p, &lockt->lt_length);
772         COPYMEM(&lockt->lt_clientid, 8);
773         lockt->lt_owner.len = be32_to_cpup(p++);
774         READ_BUF(lockt->lt_owner.len);
775         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
776
777         DECODE_TAIL;
778 }
779
780 static __be32
781 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
782 {
783         DECODE_HEAD;
784
785         READ_BUF(8);
786         locku->lu_type = be32_to_cpup(p++);
787         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
788                 goto xdr_error;
789         locku->lu_seqid = be32_to_cpup(p++);
790         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
791         if (status)
792                 return status;
793         READ_BUF(16);
794         p = xdr_decode_hyper(p, &locku->lu_offset);
795         p = xdr_decode_hyper(p, &locku->lu_length);
796
797         DECODE_TAIL;
798 }
799
800 static __be32
801 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
802 {
803         DECODE_HEAD;
804
805         READ_BUF(4);
806         lookup->lo_len = be32_to_cpup(p++);
807         READ_BUF(lookup->lo_len);
808         SAVEMEM(lookup->lo_name, lookup->lo_len);
809         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
810                 return status;
811
812         DECODE_TAIL;
813 }
814
815 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
816 {
817         __be32 *p;
818         u32 w;
819
820         READ_BUF(4);
821         w = be32_to_cpup(p++);
822         *share_access = w & NFS4_SHARE_ACCESS_MASK;
823         *deleg_want = w & NFS4_SHARE_WANT_MASK;
824         if (deleg_when)
825                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
826
827         switch (w & NFS4_SHARE_ACCESS_MASK) {
828         case NFS4_SHARE_ACCESS_READ:
829         case NFS4_SHARE_ACCESS_WRITE:
830         case NFS4_SHARE_ACCESS_BOTH:
831                 break;
832         default:
833                 return nfserr_bad_xdr;
834         }
835         w &= ~NFS4_SHARE_ACCESS_MASK;
836         if (!w)
837                 return nfs_ok;
838         if (!argp->minorversion)
839                 return nfserr_bad_xdr;
840         switch (w & NFS4_SHARE_WANT_MASK) {
841         case NFS4_SHARE_WANT_NO_PREFERENCE:
842         case NFS4_SHARE_WANT_READ_DELEG:
843         case NFS4_SHARE_WANT_WRITE_DELEG:
844         case NFS4_SHARE_WANT_ANY_DELEG:
845         case NFS4_SHARE_WANT_NO_DELEG:
846         case NFS4_SHARE_WANT_CANCEL:
847                 break;
848         default:
849                 return nfserr_bad_xdr;
850         }
851         w &= ~NFS4_SHARE_WANT_MASK;
852         if (!w)
853                 return nfs_ok;
854
855         if (!deleg_when)        /* open_downgrade */
856                 return nfserr_inval;
857         switch (w) {
858         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
859         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
860         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
861               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
862                 return nfs_ok;
863         }
864 xdr_error:
865         return nfserr_bad_xdr;
866 }
867
868 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
869 {
870         __be32 *p;
871
872         READ_BUF(4);
873         *x = be32_to_cpup(p++);
874         /* Note: unlinke access bits, deny bits may be zero. */
875         if (*x & ~NFS4_SHARE_DENY_BOTH)
876                 return nfserr_bad_xdr;
877         return nfs_ok;
878 xdr_error:
879         return nfserr_bad_xdr;
880 }
881
882 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
883 {
884         __be32 *p;
885
886         READ_BUF(4);
887         o->len = be32_to_cpup(p++);
888
889         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
890                 return nfserr_bad_xdr;
891
892         READ_BUF(o->len);
893         SAVEMEM(o->data, o->len);
894         return nfs_ok;
895 xdr_error:
896         return nfserr_bad_xdr;
897 }
898
899 static __be32
900 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
901 {
902         DECODE_HEAD;
903         u32 dummy;
904
905         memset(open->op_bmval, 0, sizeof(open->op_bmval));
906         open->op_iattr.ia_valid = 0;
907         open->op_openowner = NULL;
908
909         open->op_xdr_error = 0;
910         /* seqid, share_access, share_deny, clientid, ownerlen */
911         READ_BUF(4);
912         open->op_seqid = be32_to_cpup(p++);
913         /* decode, yet ignore deleg_when until supported */
914         status = nfsd4_decode_share_access(argp, &open->op_share_access,
915                                            &open->op_deleg_want, &dummy);
916         if (status)
917                 goto xdr_error;
918         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
919         if (status)
920                 goto xdr_error;
921         READ_BUF(sizeof(clientid_t));
922         COPYMEM(&open->op_clientid, sizeof(clientid_t));
923         status = nfsd4_decode_opaque(argp, &open->op_owner);
924         if (status)
925                 goto xdr_error;
926         READ_BUF(4);
927         open->op_create = be32_to_cpup(p++);
928         switch (open->op_create) {
929         case NFS4_OPEN_NOCREATE:
930                 break;
931         case NFS4_OPEN_CREATE:
932                 READ_BUF(4);
933                 open->op_createmode = be32_to_cpup(p++);
934                 switch (open->op_createmode) {
935                 case NFS4_CREATE_UNCHECKED:
936                 case NFS4_CREATE_GUARDED:
937                         status = nfsd4_decode_fattr(argp, open->op_bmval,
938                                 &open->op_iattr, &open->op_acl, &open->op_label,
939                                 &open->op_umask);
940                         if (status)
941                                 goto out;
942                         break;
943                 case NFS4_CREATE_EXCLUSIVE:
944                         READ_BUF(NFS4_VERIFIER_SIZE);
945                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
946                         break;
947                 case NFS4_CREATE_EXCLUSIVE4_1:
948                         if (argp->minorversion < 1)
949                                 goto xdr_error;
950                         READ_BUF(NFS4_VERIFIER_SIZE);
951                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
952                         status = nfsd4_decode_fattr(argp, open->op_bmval,
953                                 &open->op_iattr, &open->op_acl, &open->op_label,
954                                 &open->op_umask);
955                         if (status)
956                                 goto out;
957                         break;
958                 default:
959                         goto xdr_error;
960                 }
961                 break;
962         default:
963                 goto xdr_error;
964         }
965
966         /* open_claim */
967         READ_BUF(4);
968         open->op_claim_type = be32_to_cpup(p++);
969         switch (open->op_claim_type) {
970         case NFS4_OPEN_CLAIM_NULL:
971         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
972                 READ_BUF(4);
973                 open->op_fname.len = be32_to_cpup(p++);
974                 READ_BUF(open->op_fname.len);
975                 SAVEMEM(open->op_fname.data, open->op_fname.len);
976                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
977                         return status;
978                 break;
979         case NFS4_OPEN_CLAIM_PREVIOUS:
980                 READ_BUF(4);
981                 open->op_delegate_type = be32_to_cpup(p++);
982                 break;
983         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
984                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
985                 if (status)
986                         return status;
987                 READ_BUF(4);
988                 open->op_fname.len = be32_to_cpup(p++);
989                 READ_BUF(open->op_fname.len);
990                 SAVEMEM(open->op_fname.data, open->op_fname.len);
991                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
992                         return status;
993                 break;
994         case NFS4_OPEN_CLAIM_FH:
995         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
996                 if (argp->minorversion < 1)
997                         goto xdr_error;
998                 /* void */
999                 break;
1000         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1001                 if (argp->minorversion < 1)
1002                         goto xdr_error;
1003                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1004                 if (status)
1005                         return status;
1006                 break;
1007         default:
1008                 goto xdr_error;
1009         }
1010
1011         DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1016 {
1017         DECODE_HEAD;
1018
1019         if (argp->minorversion >= 1)
1020                 return nfserr_notsupp;
1021
1022         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1023         if (status)
1024                 return status;
1025         READ_BUF(4);
1026         open_conf->oc_seqid = be32_to_cpup(p++);
1027
1028         DECODE_TAIL;
1029 }
1030
1031 static __be32
1032 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1033 {
1034         DECODE_HEAD;
1035                     
1036         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1037         if (status)
1038                 return status;
1039         READ_BUF(4);
1040         open_down->od_seqid = be32_to_cpup(p++);
1041         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1042                                            &open_down->od_deleg_want, NULL);
1043         if (status)
1044                 return status;
1045         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1046         if (status)
1047                 return status;
1048         DECODE_TAIL;
1049 }
1050
1051 static __be32
1052 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1053 {
1054         DECODE_HEAD;
1055
1056         READ_BUF(4);
1057         putfh->pf_fhlen = be32_to_cpup(p++);
1058         if (putfh->pf_fhlen > NFS4_FHSIZE)
1059                 goto xdr_error;
1060         READ_BUF(putfh->pf_fhlen);
1061         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1062
1063         DECODE_TAIL;
1064 }
1065
1066 static __be32
1067 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1068 {
1069         if (argp->minorversion == 0)
1070                 return nfs_ok;
1071         return nfserr_notsupp;
1072 }
1073
1074 static __be32
1075 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1076 {
1077         DECODE_HEAD;
1078
1079         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1080         if (status)
1081                 return status;
1082         READ_BUF(12);
1083         p = xdr_decode_hyper(p, &read->rd_offset);
1084         read->rd_length = be32_to_cpup(p++);
1085
1086         DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1091 {
1092         DECODE_HEAD;
1093
1094         READ_BUF(24);
1095         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1096         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1097         readdir->rd_dircount = be32_to_cpup(p++);
1098         readdir->rd_maxcount = be32_to_cpup(p++);
1099         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1100                 goto out;
1101
1102         DECODE_TAIL;
1103 }
1104
1105 static __be32
1106 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1107 {
1108         DECODE_HEAD;
1109
1110         READ_BUF(4);
1111         remove->rm_namelen = be32_to_cpup(p++);
1112         READ_BUF(remove->rm_namelen);
1113         SAVEMEM(remove->rm_name, remove->rm_namelen);
1114         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1115                 return status;
1116
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1122 {
1123         DECODE_HEAD;
1124
1125         READ_BUF(4);
1126         rename->rn_snamelen = be32_to_cpup(p++);
1127         READ_BUF(rename->rn_snamelen);
1128         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1129         READ_BUF(4);
1130         rename->rn_tnamelen = be32_to_cpup(p++);
1131         READ_BUF(rename->rn_tnamelen);
1132         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1133         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1134                 return status;
1135         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1136                 return status;
1137
1138         DECODE_TAIL;
1139 }
1140
1141 static __be32
1142 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1143 {
1144         DECODE_HEAD;
1145
1146         if (argp->minorversion >= 1)
1147                 return nfserr_notsupp;
1148
1149         READ_BUF(sizeof(clientid_t));
1150         COPYMEM(clientid, sizeof(clientid_t));
1151
1152         DECODE_TAIL;
1153 }
1154
1155 static __be32
1156 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1157                      struct nfsd4_secinfo *secinfo)
1158 {
1159         DECODE_HEAD;
1160
1161         READ_BUF(4);
1162         secinfo->si_namelen = be32_to_cpup(p++);
1163         READ_BUF(secinfo->si_namelen);
1164         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1165         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1166         if (status)
1167                 return status;
1168         DECODE_TAIL;
1169 }
1170
1171 static __be32
1172 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1173                      struct nfsd4_secinfo_no_name *sin)
1174 {
1175         DECODE_HEAD;
1176
1177         READ_BUF(4);
1178         sin->sin_style = be32_to_cpup(p++);
1179         DECODE_TAIL;
1180 }
1181
1182 static __be32
1183 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1184 {
1185         __be32 status;
1186
1187         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1188         if (status)
1189                 return status;
1190         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1191                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1192 }
1193
1194 static __be32
1195 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1196 {
1197         DECODE_HEAD;
1198
1199         if (argp->minorversion >= 1)
1200                 return nfserr_notsupp;
1201
1202         READ_BUF(NFS4_VERIFIER_SIZE);
1203         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1204
1205         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1206         if (status)
1207                 return nfserr_bad_xdr;
1208         READ_BUF(8);
1209         setclientid->se_callback_prog = be32_to_cpup(p++);
1210         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1211         READ_BUF(setclientid->se_callback_netid_len);
1212         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1213         READ_BUF(4);
1214         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1215
1216         READ_BUF(setclientid->se_callback_addr_len);
1217         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1218         READ_BUF(4);
1219         setclientid->se_callback_ident = be32_to_cpup(p++);
1220
1221         DECODE_TAIL;
1222 }
1223
1224 static __be32
1225 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1226 {
1227         DECODE_HEAD;
1228
1229         if (argp->minorversion >= 1)
1230                 return nfserr_notsupp;
1231
1232         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1233         COPYMEM(&scd_c->sc_clientid, 8);
1234         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1235
1236         DECODE_TAIL;
1237 }
1238
1239 /* Also used for NVERIFY */
1240 static __be32
1241 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1242 {
1243         DECODE_HEAD;
1244
1245         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1246                 goto out;
1247
1248         /* For convenience's sake, we compare raw xdr'd attributes in
1249          * nfsd4_proc_verify */
1250
1251         READ_BUF(4);
1252         verify->ve_attrlen = be32_to_cpup(p++);
1253         READ_BUF(verify->ve_attrlen);
1254         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1255
1256         DECODE_TAIL;
1257 }
1258
1259 static __be32
1260 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1261 {
1262         int avail;
1263         int len;
1264         DECODE_HEAD;
1265
1266         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1267         if (status)
1268                 return status;
1269         READ_BUF(16);
1270         p = xdr_decode_hyper(p, &write->wr_offset);
1271         write->wr_stable_how = be32_to_cpup(p++);
1272         if (write->wr_stable_how > NFS_FILE_SYNC)
1273                 goto xdr_error;
1274         write->wr_buflen = be32_to_cpup(p++);
1275
1276         /* Sorry .. no magic macros for this.. *
1277          * READ_BUF(write->wr_buflen);
1278          * SAVEMEM(write->wr_buf, write->wr_buflen);
1279          */
1280         avail = (char*)argp->end - (char*)argp->p;
1281         if (avail + argp->pagelen < write->wr_buflen) {
1282                 dprintk("NFSD: xdr error (%s:%d)\n",
1283                                 __FILE__, __LINE__);
1284                 goto xdr_error;
1285         }
1286         write->wr_head.iov_base = p;
1287         write->wr_head.iov_len = avail;
1288         write->wr_pagelist = argp->pagelist;
1289
1290         len = XDR_QUADLEN(write->wr_buflen) << 2;
1291         if (len >= avail) {
1292                 int pages;
1293
1294                 len -= avail;
1295
1296                 pages = len >> PAGE_SHIFT;
1297                 argp->pagelist += pages;
1298                 argp->pagelen -= pages * PAGE_SIZE;
1299                 len -= pages * PAGE_SIZE;
1300
1301                 next_decode_page(argp);
1302         }
1303         argp->p += XDR_QUADLEN(len);
1304
1305         DECODE_TAIL;
1306 }
1307
1308 static __be32
1309 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1310 {
1311         DECODE_HEAD;
1312
1313         if (argp->minorversion >= 1)
1314                 return nfserr_notsupp;
1315
1316         READ_BUF(12);
1317         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1318         rlockowner->rl_owner.len = be32_to_cpup(p++);
1319         READ_BUF(rlockowner->rl_owner.len);
1320         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1321
1322         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1323                 return nfserr_inval;
1324         DECODE_TAIL;
1325 }
1326
1327 static __be32
1328 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1329                          struct nfsd4_exchange_id *exid)
1330 {
1331         int dummy, tmp;
1332         DECODE_HEAD;
1333
1334         READ_BUF(NFS4_VERIFIER_SIZE);
1335         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1336
1337         status = nfsd4_decode_opaque(argp, &exid->clname);
1338         if (status)
1339                 return nfserr_bad_xdr;
1340
1341         READ_BUF(4);
1342         exid->flags = be32_to_cpup(p++);
1343
1344         /* Ignore state_protect4_a */
1345         READ_BUF(4);
1346         exid->spa_how = be32_to_cpup(p++);
1347         switch (exid->spa_how) {
1348         case SP4_NONE:
1349                 break;
1350         case SP4_MACH_CRED:
1351                 /* spo_must_enforce */
1352                 status = nfsd4_decode_bitmap(argp,
1353                                         exid->spo_must_enforce);
1354                 if (status)
1355                         goto out;
1356                 /* spo_must_allow */
1357                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1358                 if (status)
1359                         goto out;
1360                 break;
1361         case SP4_SSV:
1362                 /* ssp_ops */
1363                 READ_BUF(4);
1364                 dummy = be32_to_cpup(p++);
1365                 READ_BUF(dummy * 4);
1366                 p += dummy;
1367
1368                 READ_BUF(4);
1369                 dummy = be32_to_cpup(p++);
1370                 READ_BUF(dummy * 4);
1371                 p += dummy;
1372
1373                 /* ssp_hash_algs<> */
1374                 READ_BUF(4);
1375                 tmp = be32_to_cpup(p++);
1376                 while (tmp--) {
1377                         READ_BUF(4);
1378                         dummy = be32_to_cpup(p++);
1379                         READ_BUF(dummy);
1380                         p += XDR_QUADLEN(dummy);
1381                 }
1382
1383                 /* ssp_encr_algs<> */
1384                 READ_BUF(4);
1385                 tmp = be32_to_cpup(p++);
1386                 while (tmp--) {
1387                         READ_BUF(4);
1388                         dummy = be32_to_cpup(p++);
1389                         READ_BUF(dummy);
1390                         p += XDR_QUADLEN(dummy);
1391                 }
1392
1393                 /* ignore ssp_window and ssp_num_gss_handles: */
1394                 READ_BUF(8);
1395                 break;
1396         default:
1397                 goto xdr_error;
1398         }
1399
1400         /* Ignore Implementation ID */
1401         READ_BUF(4);    /* nfs_impl_id4 array length */
1402         dummy = be32_to_cpup(p++);
1403
1404         if (dummy > 1)
1405                 goto xdr_error;
1406
1407         if (dummy == 1) {
1408                 /* nii_domain */
1409                 READ_BUF(4);
1410                 dummy = be32_to_cpup(p++);
1411                 READ_BUF(dummy);
1412                 p += XDR_QUADLEN(dummy);
1413
1414                 /* nii_name */
1415                 READ_BUF(4);
1416                 dummy = be32_to_cpup(p++);
1417                 READ_BUF(dummy);
1418                 p += XDR_QUADLEN(dummy);
1419
1420                 /* nii_date */
1421                 READ_BUF(12);
1422                 p += 3;
1423         }
1424         DECODE_TAIL;
1425 }
1426
1427 static __be32
1428 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1429                             struct nfsd4_create_session *sess)
1430 {
1431         DECODE_HEAD;
1432         u32 dummy;
1433
1434         READ_BUF(16);
1435         COPYMEM(&sess->clientid, 8);
1436         sess->seqid = be32_to_cpup(p++);
1437         sess->flags = be32_to_cpup(p++);
1438
1439         /* Fore channel attrs */
1440         READ_BUF(28);
1441         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1442         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1443         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1444         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1445         sess->fore_channel.maxops = be32_to_cpup(p++);
1446         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1447         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1448         if (sess->fore_channel.nr_rdma_attrs == 1) {
1449                 READ_BUF(4);
1450                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1451         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1452                 dprintk("Too many fore channel attr bitmaps!\n");
1453                 goto xdr_error;
1454         }
1455
1456         /* Back channel attrs */
1457         READ_BUF(28);
1458         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1459         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1460         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1461         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1462         sess->back_channel.maxops = be32_to_cpup(p++);
1463         sess->back_channel.maxreqs = be32_to_cpup(p++);
1464         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1465         if (sess->back_channel.nr_rdma_attrs == 1) {
1466                 READ_BUF(4);
1467                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1468         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1469                 dprintk("Too many back channel attr bitmaps!\n");
1470                 goto xdr_error;
1471         }
1472
1473         READ_BUF(4);
1474         sess->callback_prog = be32_to_cpup(p++);
1475         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1476         DECODE_TAIL;
1477 }
1478
1479 static __be32
1480 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1481                              struct nfsd4_destroy_session *destroy_session)
1482 {
1483         DECODE_HEAD;
1484         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1485         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1486
1487         DECODE_TAIL;
1488 }
1489
1490 static __be32
1491 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1492                           struct nfsd4_free_stateid *free_stateid)
1493 {
1494         DECODE_HEAD;
1495
1496         READ_BUF(sizeof(stateid_t));
1497         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1498         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1499
1500         DECODE_TAIL;
1501 }
1502
1503 static __be32
1504 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1505                       struct nfsd4_sequence *seq)
1506 {
1507         DECODE_HEAD;
1508
1509         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1510         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1511         seq->seqid = be32_to_cpup(p++);
1512         seq->slotid = be32_to_cpup(p++);
1513         seq->maxslots = be32_to_cpup(p++);
1514         seq->cachethis = be32_to_cpup(p++);
1515
1516         DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1521 {
1522         int i;
1523         __be32 *p, status;
1524         struct nfsd4_test_stateid_id *stateid;
1525
1526         READ_BUF(4);
1527         test_stateid->ts_num_ids = ntohl(*p++);
1528
1529         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1530
1531         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1532                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1533                 if (!stateid) {
1534                         status = nfserrno(-ENOMEM);
1535                         goto out;
1536                 }
1537
1538                 INIT_LIST_HEAD(&stateid->ts_id_list);
1539                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1540
1541                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1542                 if (status)
1543                         goto out;
1544         }
1545
1546         status = 0;
1547 out:
1548         return status;
1549 xdr_error:
1550         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1551         status = nfserr_bad_xdr;
1552         goto out;
1553 }
1554
1555 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1556 {
1557         DECODE_HEAD;
1558
1559         READ_BUF(8);
1560         COPYMEM(&dc->clientid, 8);
1561
1562         DECODE_TAIL;
1563 }
1564
1565 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1566 {
1567         DECODE_HEAD;
1568
1569         READ_BUF(4);
1570         rc->rca_one_fs = be32_to_cpup(p++);
1571
1572         DECODE_TAIL;
1573 }
1574
1575 #ifdef CONFIG_NFSD_PNFS
1576 static __be32
1577 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1578                 struct nfsd4_getdeviceinfo *gdev)
1579 {
1580         DECODE_HEAD;
1581         u32 num, i;
1582
1583         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1584         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1585         gdev->gd_layout_type = be32_to_cpup(p++);
1586         gdev->gd_maxcount = be32_to_cpup(p++);
1587         num = be32_to_cpup(p++);
1588         if (num) {
1589                 if (num > 1000)
1590                         goto xdr_error;
1591                 READ_BUF(4 * num);
1592                 gdev->gd_notify_types = be32_to_cpup(p++);
1593                 for (i = 1; i < num; i++) {
1594                         if (be32_to_cpup(p++)) {
1595                                 status = nfserr_inval;
1596                                 goto out;
1597                         }
1598                 }
1599         }
1600         DECODE_TAIL;
1601 }
1602
1603 static __be32
1604 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1605                 struct nfsd4_layoutget *lgp)
1606 {
1607         DECODE_HEAD;
1608
1609         READ_BUF(36);
1610         lgp->lg_signal = be32_to_cpup(p++);
1611         lgp->lg_layout_type = be32_to_cpup(p++);
1612         lgp->lg_seg.iomode = be32_to_cpup(p++);
1613         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1614         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1615         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1616
1617         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1618         if (status)
1619                 return status;
1620
1621         READ_BUF(4);
1622         lgp->lg_maxcount = be32_to_cpup(p++);
1623
1624         DECODE_TAIL;
1625 }
1626
1627 static __be32
1628 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1629                 struct nfsd4_layoutcommit *lcp)
1630 {
1631         DECODE_HEAD;
1632         u32 timechange;
1633
1634         READ_BUF(20);
1635         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1636         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1637         lcp->lc_reclaim = be32_to_cpup(p++);
1638
1639         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1640         if (status)
1641                 return status;
1642
1643         READ_BUF(4);
1644         lcp->lc_newoffset = be32_to_cpup(p++);
1645         if (lcp->lc_newoffset) {
1646                 READ_BUF(8);
1647                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1648         } else
1649                 lcp->lc_last_wr = 0;
1650         READ_BUF(4);
1651         timechange = be32_to_cpup(p++);
1652         if (timechange) {
1653                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1654                 if (status)
1655                         return status;
1656         } else {
1657                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1658         }
1659         READ_BUF(8);
1660         lcp->lc_layout_type = be32_to_cpup(p++);
1661
1662         /*
1663          * Save the layout update in XDR format and let the layout driver deal
1664          * with it later.
1665          */
1666         lcp->lc_up_len = be32_to_cpup(p++);
1667         if (lcp->lc_up_len > 0) {
1668                 READ_BUF(lcp->lc_up_len);
1669                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1670         }
1671
1672         DECODE_TAIL;
1673 }
1674
1675 static __be32
1676 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1677                 struct nfsd4_layoutreturn *lrp)
1678 {
1679         DECODE_HEAD;
1680
1681         READ_BUF(16);
1682         lrp->lr_reclaim = be32_to_cpup(p++);
1683         lrp->lr_layout_type = be32_to_cpup(p++);
1684         lrp->lr_seg.iomode = be32_to_cpup(p++);
1685         lrp->lr_return_type = be32_to_cpup(p++);
1686         if (lrp->lr_return_type == RETURN_FILE) {
1687                 READ_BUF(16);
1688                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1689                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1690
1691                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1692                 if (status)
1693                         return status;
1694
1695                 READ_BUF(4);
1696                 lrp->lrf_body_len = be32_to_cpup(p++);
1697                 if (lrp->lrf_body_len > 0) {
1698                         READ_BUF(lrp->lrf_body_len);
1699                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1700                 }
1701         } else {
1702                 lrp->lr_seg.offset = 0;
1703                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1704         }
1705
1706         DECODE_TAIL;
1707 }
1708 #endif /* CONFIG_NFSD_PNFS */
1709
1710 static __be32
1711 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1712                        struct nfsd4_fallocate *fallocate)
1713 {
1714         DECODE_HEAD;
1715
1716         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1717         if (status)
1718                 return status;
1719
1720         READ_BUF(16);
1721         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1722         xdr_decode_hyper(p, &fallocate->falloc_length);
1723
1724         DECODE_TAIL;
1725 }
1726
1727 static __be32
1728 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1729 {
1730         DECODE_HEAD;
1731
1732         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1733         if (status)
1734                 return status;
1735         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1736         if (status)
1737                 return status;
1738
1739         READ_BUF(8 + 8 + 8);
1740         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1741         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1742         p = xdr_decode_hyper(p, &clone->cl_count);
1743         DECODE_TAIL;
1744 }
1745
1746 static __be32
1747 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1748 {
1749         DECODE_HEAD;
1750         unsigned int tmp;
1751
1752         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1753         if (status)
1754                 return status;
1755         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1756         if (status)
1757                 return status;
1758
1759         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1760         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1761         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1762         p = xdr_decode_hyper(p, &copy->cp_count);
1763         p++; /* ca_consecutive: we always do consecutive copies */
1764         copy->cp_synchronous = be32_to_cpup(p++);
1765         tmp = be32_to_cpup(p); /* Source server list not supported */
1766
1767         DECODE_TAIL;
1768 }
1769
1770 static __be32
1771 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1772 {
1773         DECODE_HEAD;
1774
1775         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1776         if (status)
1777                 return status;
1778
1779         READ_BUF(8 + 4);
1780         p = xdr_decode_hyper(p, &seek->seek_offset);
1781         seek->seek_whence = be32_to_cpup(p);
1782
1783         DECODE_TAIL;
1784 }
1785
1786 static __be32
1787 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1788 {
1789         return nfs_ok;
1790 }
1791
1792 static __be32
1793 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1794 {
1795         return nfserr_notsupp;
1796 }
1797
1798 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1799
1800 static const nfsd4_dec nfsd4_dec_ops[] = {
1801         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1802         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1803         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1804         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1805         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1806         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1807         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1808         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1809         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1810         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1811         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1812         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1813         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1814         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1815         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1816         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1817         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1818         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1819         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1820         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1821         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1822         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1823         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1824         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1825         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1826         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1827         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1828         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1829         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1830         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1831         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1832         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1833         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1834         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1835         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1836         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1837         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1838
1839         /* new operations for NFSv4.1 */
1840         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1841         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1842         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1843         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1844         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1845         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1846         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1847 #ifdef CONFIG_NFSD_PNFS
1848         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1849         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1850         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1851         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1852         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1853 #else
1854         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1856         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1858         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1859 #endif
1860         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1861         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1862         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1863         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1864         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1865         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1866         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1867
1868         /* new operations for NFSv4.2 */
1869         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1870         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1871         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1872         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1873         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1874         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1875         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1876         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1877         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1878         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1879         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1880         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1881         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1882 };
1883
1884 static inline bool
1885 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1886 {
1887         if (op->opnum < FIRST_NFS4_OP)
1888                 return false;
1889         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1890                 return false;
1891         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1892                 return false;
1893         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1894                 return false;
1895         return true;
1896 }
1897
1898 static __be32
1899 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1900 {
1901         DECODE_HEAD;
1902         struct nfsd4_op *op;
1903         bool cachethis = false;
1904         int auth_slack= argp->rqstp->rq_auth_slack;
1905         int max_reply = auth_slack + 8; /* opcnt, status */
1906         int readcount = 0;
1907         int readbytes = 0;
1908         int i;
1909
1910         READ_BUF(4);
1911         argp->taglen = be32_to_cpup(p++);
1912         READ_BUF(argp->taglen);
1913         SAVEMEM(argp->tag, argp->taglen);
1914         READ_BUF(8);
1915         argp->minorversion = be32_to_cpup(p++);
1916         argp->opcnt = be32_to_cpup(p++);
1917         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1918
1919         if (argp->taglen > NFSD4_MAX_TAGLEN)
1920                 goto xdr_error;
1921         /*
1922          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1923          * here, so we return success at the xdr level so that
1924          * nfsd4_proc can handle this is an NFS-level error.
1925          */
1926         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1927                 return 0;
1928
1929         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1930                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1931                 if (!argp->ops) {
1932                         argp->ops = argp->iops;
1933                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1934                         goto xdr_error;
1935                 }
1936         }
1937
1938         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1939                 argp->opcnt = 0;
1940
1941         for (i = 0; i < argp->opcnt; i++) {
1942                 op = &argp->ops[i];
1943                 op->replay = NULL;
1944
1945                 READ_BUF(4);
1946                 op->opnum = be32_to_cpup(p++);
1947
1948                 if (nfsd4_opnum_in_range(argp, op))
1949                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1950                 else {
1951                         op->opnum = OP_ILLEGAL;
1952                         op->status = nfserr_op_illegal;
1953                 }
1954                 op->opdesc = OPDESC(op);
1955                 /*
1956                  * We'll try to cache the result in the DRC if any one
1957                  * op in the compound wants to be cached:
1958                  */
1959                 cachethis |= nfsd4_cache_this_op(op);
1960
1961                 if (op->opnum == OP_READ) {
1962                         readcount++;
1963                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1964                 } else
1965                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1966                 /*
1967                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1968                  * (Special case because it will just skip encoding this
1969                  * if it runs out of xdr buffer space, and it is the only
1970                  * operation that behaves this way.)
1971                  */
1972                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1973                         max_reply += NFS4_OPAQUE_LIMIT;
1974
1975                 if (op->status) {
1976                         argp->opcnt = i+1;
1977                         break;
1978                 }
1979         }
1980         /* Sessions make the DRC unnecessary: */
1981         if (argp->minorversion)
1982                 cachethis = false;
1983         svc_reserve(argp->rqstp, max_reply + readbytes);
1984         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1985
1986         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1987                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1988
1989         DECODE_TAIL;
1990 }
1991
1992 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1993                              struct svc_export *exp)
1994 {
1995         if (exp->ex_flags & NFSEXP_V4ROOT) {
1996                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1997                 *p++ = 0;
1998         } else if (IS_I_VERSION(inode)) {
1999                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2000         } else {
2001                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2002                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2003         }
2004         return p;
2005 }
2006
2007 /*
2008  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2009  * doesn't really care what resolution could theoretically be stored by
2010  * the filesystem.
2011  *
2012  * The client cares how close together changes can be while still
2013  * guaranteeing ctime changes.  For most filesystems (which have
2014  * timestamps with nanosecond fields) that is limited by the resolution
2015  * of the time returned from current_time() (which I'm assuming to be
2016  * 1/HZ).
2017  */
2018 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2019 {
2020         struct timespec ts;
2021         u32 ns;
2022
2023         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2024         ts = ns_to_timespec(ns);
2025
2026         p = xdr_encode_hyper(p, ts.tv_sec);
2027         *p++ = cpu_to_be32(ts.tv_nsec);
2028
2029         return p;
2030 }
2031
2032 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2033 {
2034         *p++ = cpu_to_be32(c->atomic);
2035         if (c->change_supported) {
2036                 p = xdr_encode_hyper(p, c->before_change);
2037                 p = xdr_encode_hyper(p, c->after_change);
2038         } else {
2039                 *p++ = cpu_to_be32(c->before_ctime_sec);
2040                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2041                 *p++ = cpu_to_be32(c->after_ctime_sec);
2042                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2043         }
2044         return p;
2045 }
2046
2047 /* Encode as an array of strings the string given with components
2048  * separated @sep, escaped with esc_enter and esc_exit.
2049  */
2050 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2051                                           char *components, char esc_enter,
2052                                           char esc_exit)
2053 {
2054         __be32 *p;
2055         __be32 pathlen;
2056         int pathlen_offset;
2057         int strlen, count=0;
2058         char *str, *end, *next;
2059
2060         dprintk("nfsd4_encode_components(%s)\n", components);
2061
2062         pathlen_offset = xdr->buf->len;
2063         p = xdr_reserve_space(xdr, 4);
2064         if (!p)
2065                 return nfserr_resource;
2066         p++; /* We will fill this in with @count later */
2067
2068         end = str = components;
2069         while (*end) {
2070                 bool found_esc = false;
2071
2072                 /* try to parse as esc_start, ..., esc_end, sep */
2073                 if (*str == esc_enter) {
2074                         for (; *end && (*end != esc_exit); end++)
2075                                 /* find esc_exit or end of string */;
2076                         next = end + 1;
2077                         if (*end && (!*next || *next == sep)) {
2078                                 str++;
2079                                 found_esc = true;
2080                         }
2081                 }
2082
2083                 if (!found_esc)
2084                         for (; *end && (*end != sep); end++)
2085                                 /* find sep or end of string */;
2086
2087                 strlen = end - str;
2088                 if (strlen) {
2089                         p = xdr_reserve_space(xdr, strlen + 4);
2090                         if (!p)
2091                                 return nfserr_resource;
2092                         p = xdr_encode_opaque(p, str, strlen);
2093                         count++;
2094                 }
2095                 else
2096                         end++;
2097                 if (found_esc)
2098                         end = next;
2099
2100                 str = end;
2101         }
2102         pathlen = htonl(count);
2103         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2104         return 0;
2105 }
2106
2107 /* Encode as an array of strings the string given with components
2108  * separated @sep.
2109  */
2110 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2111                                       char *components)
2112 {
2113         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2114 }
2115
2116 /*
2117  * encode a location element of a fs_locations structure
2118  */
2119 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2120                                         struct nfsd4_fs_location *location)
2121 {
2122         __be32 status;
2123
2124         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2125                                                 '[', ']');
2126         if (status)
2127                 return status;
2128         status = nfsd4_encode_components(xdr, '/', location->path);
2129         if (status)
2130                 return status;
2131         return 0;
2132 }
2133
2134 /*
2135  * Encode a path in RFC3530 'pathname4' format
2136  */
2137 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2138                                 const struct path *root,
2139                                 const struct path *path)
2140 {
2141         struct path cur = *path;
2142         __be32 *p;
2143         struct dentry **components = NULL;
2144         unsigned int ncomponents = 0;
2145         __be32 err = nfserr_jukebox;
2146
2147         dprintk("nfsd4_encode_components(");
2148
2149         path_get(&cur);
2150         /* First walk the path up to the nfsd root, and store the
2151          * dentries/path components in an array.
2152          */
2153         for (;;) {
2154                 if (path_equal(&cur, root))
2155                         break;
2156                 if (cur.dentry == cur.mnt->mnt_root) {
2157                         if (follow_up(&cur))
2158                                 continue;
2159                         goto out_free;
2160                 }
2161                 if ((ncomponents & 15) == 0) {
2162                         struct dentry **new;
2163                         new = krealloc(components,
2164                                         sizeof(*new) * (ncomponents + 16),
2165                                         GFP_KERNEL);
2166                         if (!new)
2167                                 goto out_free;
2168                         components = new;
2169                 }
2170                 components[ncomponents++] = cur.dentry;
2171                 cur.dentry = dget_parent(cur.dentry);
2172         }
2173         err = nfserr_resource;
2174         p = xdr_reserve_space(xdr, 4);
2175         if (!p)
2176                 goto out_free;
2177         *p++ = cpu_to_be32(ncomponents);
2178
2179         while (ncomponents) {
2180                 struct dentry *dentry = components[ncomponents - 1];
2181                 unsigned int len;
2182
2183                 spin_lock(&dentry->d_lock);
2184                 len = dentry->d_name.len;
2185                 p = xdr_reserve_space(xdr, len + 4);
2186                 if (!p) {
2187                         spin_unlock(&dentry->d_lock);
2188                         goto out_free;
2189                 }
2190                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2191                 dprintk("/%pd", dentry);
2192                 spin_unlock(&dentry->d_lock);
2193                 dput(dentry);
2194                 ncomponents--;
2195         }
2196
2197         err = 0;
2198 out_free:
2199         dprintk(")\n");
2200         while (ncomponents)
2201                 dput(components[--ncomponents]);
2202         kfree(components);
2203         path_put(&cur);
2204         return err;
2205 }
2206
2207 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2208                         struct svc_rqst *rqstp, const struct path *path)
2209 {
2210         struct svc_export *exp_ps;
2211         __be32 res;
2212
2213         exp_ps = rqst_find_fsidzero_export(rqstp);
2214         if (IS_ERR(exp_ps))
2215                 return nfserrno(PTR_ERR(exp_ps));
2216         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2217         exp_put(exp_ps);
2218         return res;
2219 }
2220
2221 /*
2222  *  encode a fs_locations structure
2223  */
2224 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2225                         struct svc_rqst *rqstp, struct svc_export *exp)
2226 {
2227         __be32 status;
2228         int i;
2229         __be32 *p;
2230         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2231
2232         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2233         if (status)
2234                 return status;
2235         p = xdr_reserve_space(xdr, 4);
2236         if (!p)
2237                 return nfserr_resource;
2238         *p++ = cpu_to_be32(fslocs->locations_count);
2239         for (i=0; i<fslocs->locations_count; i++) {
2240                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2241                 if (status)
2242                         return status;
2243         }
2244         return 0;
2245 }
2246
2247 static u32 nfs4_file_type(umode_t mode)
2248 {
2249         switch (mode & S_IFMT) {
2250         case S_IFIFO:   return NF4FIFO;
2251         case S_IFCHR:   return NF4CHR;
2252         case S_IFDIR:   return NF4DIR;
2253         case S_IFBLK:   return NF4BLK;
2254         case S_IFLNK:   return NF4LNK;
2255         case S_IFREG:   return NF4REG;
2256         case S_IFSOCK:  return NF4SOCK;
2257         default:        return NF4BAD;
2258         };
2259 }
2260
2261 static inline __be32
2262 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2263                      struct nfs4_ace *ace)
2264 {
2265         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2266                 return nfs4_acl_write_who(xdr, ace->whotype);
2267         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2268                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2269         else
2270                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2271 }
2272
2273 static inline __be32
2274 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2275 {
2276         __be32          *p;
2277         unsigned long   i = hweight_long(layout_types);
2278
2279         p = xdr_reserve_space(xdr, 4 + 4 * i);
2280         if (!p)
2281                 return nfserr_resource;
2282
2283         *p++ = cpu_to_be32(i);
2284
2285         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2286                 if (layout_types & (1 << i))
2287                         *p++ = cpu_to_be32(i);
2288
2289         return 0;
2290 }
2291
2292 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2293                               FATTR4_WORD0_RDATTR_ERROR)
2294 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2295 #define WORD2_ABSENT_FS_ATTRS 0
2296
2297 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2298 static inline __be32
2299 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2300                             void *context, int len)
2301 {
2302         __be32 *p;
2303
2304         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2305         if (!p)
2306                 return nfserr_resource;
2307
2308         /*
2309          * For now we use a 0 here to indicate the null translation; in
2310          * the future we may place a call to translation code here.
2311          */
2312         *p++ = cpu_to_be32(0); /* lfs */
2313         *p++ = cpu_to_be32(0); /* pi */
2314         p = xdr_encode_opaque(p, context, len);
2315         return 0;
2316 }
2317 #else
2318 static inline __be32
2319 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2320                             void *context, int len)
2321 { return 0; }
2322 #endif
2323
2324 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2325 {
2326         /* As per referral draft:  */
2327         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2328             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2329                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2330                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2331                         *rdattr_err = NFSERR_MOVED;
2332                 else
2333                         return nfserr_moved;
2334         }
2335         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2336         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2337         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2338         return 0;
2339 }
2340
2341
2342 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2343 {
2344         struct path path = exp->ex_path;
2345         int err;
2346
2347         path_get(&path);
2348         while (follow_up(&path)) {
2349                 if (path.dentry != path.mnt->mnt_root)
2350                         break;
2351         }
2352         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2353         path_put(&path);
2354         return err;
2355 }
2356
2357 static __be32
2358 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2359 {
2360         __be32 *p;
2361
2362         if (bmval2) {
2363                 p = xdr_reserve_space(xdr, 16);
2364                 if (!p)
2365                         goto out_resource;
2366                 *p++ = cpu_to_be32(3);
2367                 *p++ = cpu_to_be32(bmval0);
2368                 *p++ = cpu_to_be32(bmval1);
2369                 *p++ = cpu_to_be32(bmval2);
2370         } else if (bmval1) {
2371                 p = xdr_reserve_space(xdr, 12);
2372                 if (!p)
2373                         goto out_resource;
2374                 *p++ = cpu_to_be32(2);
2375                 *p++ = cpu_to_be32(bmval0);
2376                 *p++ = cpu_to_be32(bmval1);
2377         } else {
2378                 p = xdr_reserve_space(xdr, 8);
2379                 if (!p)
2380                         goto out_resource;
2381                 *p++ = cpu_to_be32(1);
2382                 *p++ = cpu_to_be32(bmval0);
2383         }
2384
2385         return 0;
2386 out_resource:
2387         return nfserr_resource;
2388 }
2389
2390 /*
2391  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2392  * ourselves.
2393  */
2394 static __be32
2395 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2396                 struct svc_export *exp,
2397                 struct dentry *dentry, u32 *bmval,
2398                 struct svc_rqst *rqstp, int ignore_crossmnt)
2399 {
2400         u32 bmval0 = bmval[0];
2401         u32 bmval1 = bmval[1];
2402         u32 bmval2 = bmval[2];
2403         struct kstat stat;
2404         struct svc_fh *tempfh = NULL;
2405         struct kstatfs statfs;
2406         __be32 *p;
2407         int starting_len = xdr->buf->len;
2408         int attrlen_offset;
2409         __be32 attrlen;
2410         u32 dummy;
2411         u64 dummy64;
2412         u32 rdattr_err = 0;
2413         __be32 status;
2414         int err;
2415         struct nfs4_acl *acl = NULL;
2416         void *context = NULL;
2417         int contextlen;
2418         bool contextsupport = false;
2419         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2420         u32 minorversion = resp->cstate.minorversion;
2421         struct path path = {
2422                 .mnt    = exp->ex_path.mnt,
2423                 .dentry = dentry,
2424         };
2425         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2426
2427         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2428         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2429
2430         if (exp->ex_fslocs.migrated) {
2431                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2432                 if (status)
2433                         goto out;
2434         }
2435
2436         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2437         if (err)
2438                 goto out_nfserr;
2439         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2440                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2441             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2442                        FATTR4_WORD1_SPACE_TOTAL))) {
2443                 err = vfs_statfs(&path, &statfs);
2444                 if (err)
2445                         goto out_nfserr;
2446         }
2447         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2448                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2449                 status = nfserr_jukebox;
2450                 if (!tempfh)
2451                         goto out;
2452                 fh_init(tempfh, NFS4_FHSIZE);
2453                 status = fh_compose(tempfh, exp, dentry, NULL);
2454                 if (status)
2455                         goto out;
2456                 fhp = tempfh;
2457         }
2458         if (bmval0 & FATTR4_WORD0_ACL) {
2459                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2460                 if (err == -EOPNOTSUPP)
2461                         bmval0 &= ~FATTR4_WORD0_ACL;
2462                 else if (err == -EINVAL) {
2463                         status = nfserr_attrnotsupp;
2464                         goto out;
2465                 } else if (err != 0)
2466                         goto out_nfserr;
2467         }
2468
2469 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2470         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2471              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2472                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2473                         err = security_inode_getsecctx(d_inode(dentry),
2474                                                 &context, &contextlen);
2475                 else
2476                         err = -EOPNOTSUPP;
2477                 contextsupport = (err == 0);
2478                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2479                         if (err == -EOPNOTSUPP)
2480                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2481                         else if (err)
2482                                 goto out_nfserr;
2483                 }
2484         }
2485 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2486
2487         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2488         if (status)
2489                 goto out;
2490
2491         attrlen_offset = xdr->buf->len;
2492         p = xdr_reserve_space(xdr, 4);
2493         if (!p)
2494                 goto out_resource;
2495         p++;                /* to be backfilled later */
2496
2497         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2498                 u32 supp[3];
2499
2500                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2501
2502                 if (!IS_POSIXACL(dentry->d_inode))
2503                         supp[0] &= ~FATTR4_WORD0_ACL;
2504                 if (!contextsupport)
2505                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2506                 if (!supp[2]) {
2507                         p = xdr_reserve_space(xdr, 12);
2508                         if (!p)
2509                                 goto out_resource;
2510                         *p++ = cpu_to_be32(2);
2511                         *p++ = cpu_to_be32(supp[0]);
2512                         *p++ = cpu_to_be32(supp[1]);
2513                 } else {
2514                         p = xdr_reserve_space(xdr, 16);
2515                         if (!p)
2516                                 goto out_resource;
2517                         *p++ = cpu_to_be32(3);
2518                         *p++ = cpu_to_be32(supp[0]);
2519                         *p++ = cpu_to_be32(supp[1]);
2520                         *p++ = cpu_to_be32(supp[2]);
2521                 }
2522         }
2523         if (bmval0 & FATTR4_WORD0_TYPE) {
2524                 p = xdr_reserve_space(xdr, 4);
2525                 if (!p)
2526                         goto out_resource;
2527                 dummy = nfs4_file_type(stat.mode);
2528                 if (dummy == NF4BAD) {
2529                         status = nfserr_serverfault;
2530                         goto out;
2531                 }
2532                 *p++ = cpu_to_be32(dummy);
2533         }
2534         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2535                 p = xdr_reserve_space(xdr, 4);
2536                 if (!p)
2537                         goto out_resource;
2538                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2539                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2540                 else
2541                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2542                                                 NFS4_FH_VOL_RENAME);
2543         }
2544         if (bmval0 & FATTR4_WORD0_CHANGE) {
2545                 p = xdr_reserve_space(xdr, 8);
2546                 if (!p)
2547                         goto out_resource;
2548                 p = encode_change(p, &stat, d_inode(dentry), exp);
2549         }
2550         if (bmval0 & FATTR4_WORD0_SIZE) {
2551                 p = xdr_reserve_space(xdr, 8);
2552                 if (!p)
2553                         goto out_resource;
2554                 p = xdr_encode_hyper(p, stat.size);
2555         }
2556         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2557                 p = xdr_reserve_space(xdr, 4);
2558                 if (!p)
2559                         goto out_resource;
2560                 *p++ = cpu_to_be32(1);
2561         }
2562         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2563                 p = xdr_reserve_space(xdr, 4);
2564                 if (!p)
2565                         goto out_resource;
2566                 *p++ = cpu_to_be32(1);
2567         }
2568         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2569                 p = xdr_reserve_space(xdr, 4);
2570                 if (!p)
2571                         goto out_resource;
2572                 *p++ = cpu_to_be32(0);
2573         }
2574         if (bmval0 & FATTR4_WORD0_FSID) {
2575                 p = xdr_reserve_space(xdr, 16);
2576                 if (!p)
2577                         goto out_resource;
2578                 if (exp->ex_fslocs.migrated) {
2579                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2580                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2581                 } else switch(fsid_source(fhp)) {
2582                 case FSIDSOURCE_FSID:
2583                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2584                         p = xdr_encode_hyper(p, (u64)0);
2585                         break;
2586                 case FSIDSOURCE_DEV:
2587                         *p++ = cpu_to_be32(0);
2588                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2589                         *p++ = cpu_to_be32(0);
2590                         *p++ = cpu_to_be32(MINOR(stat.dev));
2591                         break;
2592                 case FSIDSOURCE_UUID:
2593                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2594                                                                 EX_UUID_LEN);
2595                         break;
2596                 }
2597         }
2598         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2599                 p = xdr_reserve_space(xdr, 4);
2600                 if (!p)
2601                         goto out_resource;
2602                 *p++ = cpu_to_be32(0);
2603         }
2604         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2605                 p = xdr_reserve_space(xdr, 4);
2606                 if (!p)
2607                         goto out_resource;
2608                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2609         }
2610         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2611                 p = xdr_reserve_space(xdr, 4);
2612                 if (!p)
2613                         goto out_resource;
2614                 *p++ = cpu_to_be32(rdattr_err);
2615         }
2616         if (bmval0 & FATTR4_WORD0_ACL) {
2617                 struct nfs4_ace *ace;
2618
2619                 if (acl == NULL) {
2620                         p = xdr_reserve_space(xdr, 4);
2621                         if (!p)
2622                                 goto out_resource;
2623
2624                         *p++ = cpu_to_be32(0);
2625                         goto out_acl;
2626                 }
2627                 p = xdr_reserve_space(xdr, 4);
2628                 if (!p)
2629                         goto out_resource;
2630                 *p++ = cpu_to_be32(acl->naces);
2631
2632                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2633                         p = xdr_reserve_space(xdr, 4*3);
2634                         if (!p)
2635                                 goto out_resource;
2636                         *p++ = cpu_to_be32(ace->type);
2637                         *p++ = cpu_to_be32(ace->flag);
2638                         *p++ = cpu_to_be32(ace->access_mask &
2639                                                         NFS4_ACE_MASK_ALL);
2640                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2641                         if (status)
2642                                 goto out;
2643                 }
2644         }
2645 out_acl:
2646         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2647                 p = xdr_reserve_space(xdr, 4);
2648                 if (!p)
2649                         goto out_resource;
2650                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2651                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2652         }
2653         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2654                 p = xdr_reserve_space(xdr, 4);
2655                 if (!p)
2656                         goto out_resource;
2657                 *p++ = cpu_to_be32(1);
2658         }
2659         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2660                 p = xdr_reserve_space(xdr, 4);
2661                 if (!p)
2662                         goto out_resource;
2663                 *p++ = cpu_to_be32(0);
2664         }
2665         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2666                 p = xdr_reserve_space(xdr, 4);
2667                 if (!p)
2668                         goto out_resource;
2669                 *p++ = cpu_to_be32(1);
2670         }
2671         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2672                 p = xdr_reserve_space(xdr, 4);
2673                 if (!p)
2674                         goto out_resource;
2675                 *p++ = cpu_to_be32(1);
2676         }
2677         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2678                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2679                 if (!p)
2680                         goto out_resource;
2681                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2682                                         fhp->fh_handle.fh_size);
2683         }
2684         if (bmval0 & FATTR4_WORD0_FILEID) {
2685                 p = xdr_reserve_space(xdr, 8);
2686                 if (!p)
2687                         goto out_resource;
2688                 p = xdr_encode_hyper(p, stat.ino);
2689         }
2690         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2691                 p = xdr_reserve_space(xdr, 8);
2692                 if (!p)
2693                         goto out_resource;
2694                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2695         }
2696         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2697                 p = xdr_reserve_space(xdr, 8);
2698                 if (!p)
2699                         goto out_resource;
2700                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2701         }
2702         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2703                 p = xdr_reserve_space(xdr, 8);
2704                 if (!p)
2705                         goto out_resource;
2706                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2707         }
2708         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2709                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2710                 if (status)
2711                         goto out;
2712         }
2713         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2714                 p = xdr_reserve_space(xdr, 4);
2715                 if (!p)
2716                         goto out_resource;
2717                 *p++ = cpu_to_be32(1);
2718         }
2719         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2720                 p = xdr_reserve_space(xdr, 8);
2721                 if (!p)
2722                         goto out_resource;
2723                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2724         }
2725         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2726                 p = xdr_reserve_space(xdr, 4);
2727                 if (!p)
2728                         goto out_resource;
2729                 *p++ = cpu_to_be32(255);
2730         }
2731         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2732                 p = xdr_reserve_space(xdr, 4);
2733                 if (!p)
2734                         goto out_resource;
2735                 *p++ = cpu_to_be32(statfs.f_namelen);
2736         }
2737         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2738                 p = xdr_reserve_space(xdr, 8);
2739                 if (!p)
2740                         goto out_resource;
2741                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2742         }
2743         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2744                 p = xdr_reserve_space(xdr, 8);
2745                 if (!p)
2746                         goto out_resource;
2747                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2748         }
2749         if (bmval1 & FATTR4_WORD1_MODE) {
2750                 p = xdr_reserve_space(xdr, 4);
2751                 if (!p)
2752                         goto out_resource;
2753                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2754         }
2755         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2756                 p = xdr_reserve_space(xdr, 4);
2757                 if (!p)
2758                         goto out_resource;
2759                 *p++ = cpu_to_be32(1);
2760         }
2761         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2762                 p = xdr_reserve_space(xdr, 4);
2763                 if (!p)
2764                         goto out_resource;
2765                 *p++ = cpu_to_be32(stat.nlink);
2766         }
2767         if (bmval1 & FATTR4_WORD1_OWNER) {
2768                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2769                 if (status)
2770                         goto out;
2771         }
2772         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2773                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2774                 if (status)
2775                         goto out;
2776         }
2777         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2778                 p = xdr_reserve_space(xdr, 8);
2779                 if (!p)
2780                         goto out_resource;
2781                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2782                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2783         }
2784         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2785                 p = xdr_reserve_space(xdr, 8);
2786                 if (!p)
2787                         goto out_resource;
2788                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2789                 p = xdr_encode_hyper(p, dummy64);
2790         }
2791         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2792                 p = xdr_reserve_space(xdr, 8);
2793                 if (!p)
2794                         goto out_resource;
2795                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2796                 p = xdr_encode_hyper(p, dummy64);
2797         }
2798         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2799                 p = xdr_reserve_space(xdr, 8);
2800                 if (!p)
2801                         goto out_resource;
2802                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2803                 p = xdr_encode_hyper(p, dummy64);
2804         }
2805         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2806                 p = xdr_reserve_space(xdr, 8);
2807                 if (!p)
2808                         goto out_resource;
2809                 dummy64 = (u64)stat.blocks << 9;
2810                 p = xdr_encode_hyper(p, dummy64);
2811         }
2812         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2813                 p = xdr_reserve_space(xdr, 12);
2814                 if (!p)
2815                         goto out_resource;
2816                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2817                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2818         }
2819         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2820                 p = xdr_reserve_space(xdr, 12);
2821                 if (!p)
2822                         goto out_resource;
2823                 p = encode_time_delta(p, d_inode(dentry));
2824         }
2825         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2826                 p = xdr_reserve_space(xdr, 12);
2827                 if (!p)
2828                         goto out_resource;
2829                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2830                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2831         }
2832         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2833                 p = xdr_reserve_space(xdr, 12);
2834                 if (!p)
2835                         goto out_resource;
2836                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2837                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2838         }
2839         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2840                 struct kstat parent_stat;
2841                 u64 ino = stat.ino;
2842
2843                 p = xdr_reserve_space(xdr, 8);
2844                 if (!p)
2845                         goto out_resource;
2846                 /*
2847                  * Get parent's attributes if not ignoring crossmount
2848                  * and this is the root of a cross-mounted filesystem.
2849                  */
2850                 if (ignore_crossmnt == 0 &&
2851                     dentry == exp->ex_path.mnt->mnt_root) {
2852                         err = get_parent_attributes(exp, &parent_stat);
2853                         if (err)
2854                                 goto out_nfserr;
2855                         ino = parent_stat.ino;
2856                 }
2857                 p = xdr_encode_hyper(p, ino);
2858         }
2859 #ifdef CONFIG_NFSD_PNFS
2860         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2861                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2862                 if (status)
2863                         goto out;
2864         }
2865
2866         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2867                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2868                 if (status)
2869                         goto out;
2870         }
2871
2872         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2873                 p = xdr_reserve_space(xdr, 4);
2874                 if (!p)
2875                         goto out_resource;
2876                 *p++ = cpu_to_be32(stat.blksize);
2877         }
2878 #endif /* CONFIG_NFSD_PNFS */
2879         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2880                 u32 supp[3];
2881
2882                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2883                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2884                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2885                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2886
2887                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2888                 if (status)
2889                         goto out;
2890         }
2891
2892         if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2893                 p = xdr_reserve_space(xdr, 4);
2894                 if (!p)
2895                         goto out_resource;
2896                 if (IS_I_VERSION(d_inode(dentry)))
2897                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2898                 else
2899                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2900         }
2901
2902         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2903                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2904                                                                 contextlen);
2905                 if (status)
2906                         goto out;
2907         }
2908
2909         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2910         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2911         status = nfs_ok;
2912
2913 out:
2914 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2915         if (context)
2916                 security_release_secctx(context, contextlen);
2917 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2918         kfree(acl);
2919         if (tempfh) {
2920                 fh_put(tempfh);
2921                 kfree(tempfh);
2922         }
2923         if (status)
2924                 xdr_truncate_encode(xdr, starting_len);
2925         return status;
2926 out_nfserr:
2927         status = nfserrno(err);
2928         goto out;
2929 out_resource:
2930         status = nfserr_resource;
2931         goto out;
2932 }
2933
2934 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2935                                 struct xdr_buf *buf, __be32 *p, int bytes)
2936 {
2937         xdr->scratch.iov_len = 0;
2938         memset(buf, 0, sizeof(struct xdr_buf));
2939         buf->head[0].iov_base = p;
2940         buf->head[0].iov_len = 0;
2941         buf->len = 0;
2942         xdr->buf = buf;
2943         xdr->iov = buf->head;
2944         xdr->p = p;
2945         xdr->end = (void *)p + bytes;
2946         buf->buflen = bytes;
2947 }
2948
2949 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2950                         struct svc_fh *fhp, struct svc_export *exp,
2951                         struct dentry *dentry, u32 *bmval,
2952                         struct svc_rqst *rqstp, int ignore_crossmnt)
2953 {
2954         struct xdr_buf dummy;
2955         struct xdr_stream xdr;
2956         __be32 ret;
2957
2958         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2959         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2960                                                         ignore_crossmnt);
2961         *p = xdr.p;
2962         return ret;
2963 }
2964
2965 static inline int attributes_need_mount(u32 *bmval)
2966 {
2967         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2968                 return 1;
2969         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2970                 return 1;
2971         return 0;
2972 }
2973
2974 static __be32
2975 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2976                         const char *name, int namlen)
2977 {
2978         struct svc_export *exp = cd->rd_fhp->fh_export;
2979         struct dentry *dentry;
2980         __be32 nfserr;
2981         int ignore_crossmnt = 0;
2982
2983         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2984         if (IS_ERR(dentry))
2985                 return nfserrno(PTR_ERR(dentry));
2986         if (d_really_is_negative(dentry)) {
2987                 /*
2988                  * we're not holding the i_mutex here, so there's
2989                  * a window where this directory entry could have gone
2990                  * away.
2991                  */
2992                 dput(dentry);
2993                 return nfserr_noent;
2994         }
2995
2996         exp_get(exp);
2997         /*
2998          * In the case of a mountpoint, the client may be asking for
2999          * attributes that are only properties of the underlying filesystem
3000          * as opposed to the cross-mounted file system. In such a case,
3001          * we will not follow the cross mount and will fill the attribtutes
3002          * directly from the mountpoint dentry.
3003          */
3004         if (nfsd_mountpoint(dentry, exp)) {
3005                 int err;
3006
3007                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3008                                 && !attributes_need_mount(cd->rd_bmval)) {
3009                         ignore_crossmnt = 1;
3010                         goto out_encode;
3011                 }
3012                 /*
3013                  * Why the heck aren't we just using nfsd_lookup??
3014                  * Different "."/".." handling?  Something else?
3015                  * At least, add a comment here to explain....
3016                  */
3017                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3018                 if (err) {
3019                         nfserr = nfserrno(err);
3020                         goto out_put;
3021                 }
3022                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3023                 if (nfserr)
3024                         goto out_put;
3025
3026         }
3027 out_encode:
3028         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3029                                         cd->rd_rqstp, ignore_crossmnt);
3030 out_put:
3031         dput(dentry);
3032         exp_put(exp);
3033         return nfserr;
3034 }
3035
3036 static __be32 *
3037 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3038 {
3039         __be32 *p;
3040
3041         p = xdr_reserve_space(xdr, 20);
3042         if (!p)
3043                 return NULL;
3044         *p++ = htonl(2);
3045         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3046         *p++ = htonl(0);                         /* bmval1 */
3047
3048         *p++ = htonl(4);     /* attribute length */
3049         *p++ = nfserr;       /* no htonl */
3050         return p;
3051 }
3052
3053 static int
3054 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3055                     loff_t offset, u64 ino, unsigned int d_type)
3056 {
3057         struct readdir_cd *ccd = ccdv;
3058         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3059         struct xdr_stream *xdr = cd->xdr;
3060         int start_offset = xdr->buf->len;
3061         int cookie_offset;
3062         u32 name_and_cookie;
3063         int entry_bytes;
3064         __be32 nfserr = nfserr_toosmall;
3065         __be64 wire_offset;
3066         __be32 *p;
3067
3068         /* In nfsv4, "." and ".." never make it onto the wire.. */
3069         if (name && isdotent(name, namlen)) {
3070                 cd->common.err = nfs_ok;
3071                 return 0;
3072         }
3073
3074         if (cd->cookie_offset) {
3075                 wire_offset = cpu_to_be64(offset);
3076                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3077                                                         &wire_offset, 8);
3078         }
3079
3080         p = xdr_reserve_space(xdr, 4);
3081         if (!p)
3082                 goto fail;
3083         *p++ = xdr_one;                             /* mark entry present */
3084         cookie_offset = xdr->buf->len;
3085         p = xdr_reserve_space(xdr, 3*4 + namlen);
3086         if (!p)
3087                 goto fail;
3088         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3089         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3090
3091         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3092         switch (nfserr) {
3093         case nfs_ok:
3094                 break;
3095         case nfserr_resource:
3096                 nfserr = nfserr_toosmall;
3097                 goto fail;
3098         case nfserr_noent:
3099                 xdr_truncate_encode(xdr, start_offset);
3100                 goto skip_entry;
3101         default:
3102                 /*
3103                  * If the client requested the RDATTR_ERROR attribute,
3104                  * we stuff the error code into this attribute
3105                  * and continue.  If this attribute was not requested,
3106                  * then in accordance with the spec, we fail the
3107                  * entire READDIR operation(!)
3108                  */
3109                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3110                         goto fail;
3111                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3112                 if (p == NULL) {
3113                         nfserr = nfserr_toosmall;
3114                         goto fail;
3115                 }
3116         }
3117         nfserr = nfserr_toosmall;
3118         entry_bytes = xdr->buf->len - start_offset;
3119         if (entry_bytes > cd->rd_maxcount)
3120                 goto fail;
3121         cd->rd_maxcount -= entry_bytes;
3122         /*
3123          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3124          * let's always let through the first entry, at least:
3125          */
3126         if (!cd->rd_dircount)
3127                 goto fail;
3128         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3129         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3130                 goto fail;
3131         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3132
3133         cd->cookie_offset = cookie_offset;
3134 skip_entry:
3135         cd->common.err = nfs_ok;
3136         return 0;
3137 fail:
3138         xdr_truncate_encode(xdr, start_offset);
3139         cd->common.err = nfserr;
3140         return -EINVAL;
3141 }
3142
3143 static __be32
3144 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3145 {
3146         __be32 *p;
3147
3148         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3149         if (!p)
3150                 return nfserr_resource;
3151         *p++ = cpu_to_be32(sid->si_generation);
3152         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3153                                         sizeof(stateid_opaque_t));
3154         return 0;
3155 }
3156
3157 static __be32
3158 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3159 {
3160         struct xdr_stream *xdr = &resp->xdr;
3161         __be32 *p;
3162
3163         p = xdr_reserve_space(xdr, 8);
3164         if (!p)
3165                 return nfserr_resource;
3166         *p++ = cpu_to_be32(access->ac_supported);
3167         *p++ = cpu_to_be32(access->ac_resp_access);
3168         return 0;
3169 }
3170
3171 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3172 {
3173         struct xdr_stream *xdr = &resp->xdr;
3174         __be32 *p;
3175
3176         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3177         if (!p)
3178                 return nfserr_resource;
3179         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3180                                         NFS4_MAX_SESSIONID_LEN);
3181         *p++ = cpu_to_be32(bcts->dir);
3182         /* Upshifting from TCP to RDMA is not supported */
3183         *p++ = cpu_to_be32(0);
3184         return 0;
3185 }
3186
3187 static __be32
3188 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3189 {
3190         struct xdr_stream *xdr = &resp->xdr;
3191
3192         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3193 }
3194
3195
3196 static __be32
3197 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3198 {
3199         struct xdr_stream *xdr = &resp->xdr;
3200         __be32 *p;
3201
3202         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3203         if (!p)
3204                 return nfserr_resource;
3205         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3206                                                 NFS4_VERIFIER_SIZE);
3207         return 0;
3208 }
3209
3210 static __be32
3211 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3212 {
3213         struct xdr_stream *xdr = &resp->xdr;
3214         __be32 *p;
3215
3216         p = xdr_reserve_space(xdr, 20);
3217         if (!p)
3218                 return nfserr_resource;
3219         encode_cinfo(p, &create->cr_cinfo);
3220         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3221                         create->cr_bmval[1], create->cr_bmval[2]);
3222         return 0;
3223 }
3224
3225 static __be32
3226 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3227 {
3228         struct svc_fh *fhp = getattr->ga_fhp;
3229         struct xdr_stream *xdr = &resp->xdr;
3230
3231         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3232                                     getattr->ga_bmval, resp->rqstp, 0);
3233 }
3234
3235 static __be32
3236 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3237 {
3238         struct xdr_stream *xdr = &resp->xdr;
3239         struct svc_fh *fhp = *fhpp;
3240         unsigned int len;
3241         __be32 *p;
3242
3243         len = fhp->fh_handle.fh_size;
3244         p = xdr_reserve_space(xdr, len + 4);
3245         if (!p)
3246                 return nfserr_resource;
3247         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3248         return 0;
3249 }
3250
3251 /*
3252 * Including all fields other than the name, a LOCK4denied structure requires
3253 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3254 */
3255 static __be32
3256 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3257 {
3258         struct xdr_netobj *conf = &ld->ld_owner;
3259         __be32 *p;
3260
3261 again:
3262         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3263         if (!p) {
3264                 /*
3265                  * Don't fail to return the result just because we can't
3266                  * return the conflicting open:
3267                  */
3268                 if (conf->len) {
3269                         kfree(conf->data);
3270                         conf->len = 0;
3271                         conf->data = NULL;
3272                         goto again;
3273                 }
3274                 return nfserr_resource;
3275         }
3276         p = xdr_encode_hyper(p, ld->ld_start);
3277         p = xdr_encode_hyper(p, ld->ld_length);
3278         *p++ = cpu_to_be32(ld->ld_type);
3279         if (conf->len) {
3280                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3281                 p = xdr_encode_opaque(p, conf->data, conf->len);
3282                 kfree(conf->data);
3283         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3284                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3285                 *p++ = cpu_to_be32(0); /* length of owner name */
3286         }
3287         return nfserr_denied;
3288 }
3289
3290 static __be32
3291 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3292 {
3293         struct xdr_stream *xdr = &resp->xdr;
3294
3295         if (!nfserr)
3296                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3297         else if (nfserr == nfserr_denied)
3298                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3299
3300         return nfserr;
3301 }
3302
3303 static __be32
3304 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3305 {
3306         struct xdr_stream *xdr = &resp->xdr;
3307
3308         if (nfserr == nfserr_denied)
3309                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3310         return nfserr;
3311 }
3312
3313 static __be32
3314 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3315 {
3316         struct xdr_stream *xdr = &resp->xdr;
3317
3318         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3319 }
3320
3321
3322 static __be32
3323 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3324 {
3325         struct xdr_stream *xdr = &resp->xdr;
3326         __be32 *p;
3327
3328         p = xdr_reserve_space(xdr, 20);
3329         if (!p)
3330                 return nfserr_resource;
3331         p = encode_cinfo(p, &link->li_cinfo);
3332         return 0;
3333 }
3334
3335
3336 static __be32
3337 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3338 {
3339         struct xdr_stream *xdr = &resp->xdr;
3340         __be32 *p;
3341
3342         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3343         if (nfserr)
3344                 return nfserr;
3345         p = xdr_reserve_space(xdr, 24);
3346         if (!p)
3347                 return nfserr_resource;
3348         p = encode_cinfo(p, &open->op_cinfo);
3349         *p++ = cpu_to_be32(open->op_rflags);
3350
3351         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3352                                         open->op_bmval[2]);
3353         if (nfserr)
3354                 return nfserr;
3355
3356         p = xdr_reserve_space(xdr, 4);
3357         if (!p)
3358                 return nfserr_resource;
3359
3360         *p++ = cpu_to_be32(open->op_delegate_type);
3361         switch (open->op_delegate_type) {
3362         case NFS4_OPEN_DELEGATE_NONE:
3363                 break;
3364         case NFS4_OPEN_DELEGATE_READ:
3365                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3366                 if (nfserr)
3367                         return nfserr;
3368                 p = xdr_reserve_space(xdr, 20);
3369                 if (!p)
3370                         return nfserr_resource;
3371                 *p++ = cpu_to_be32(open->op_recall);
3372
3373                 /*
3374                  * TODO: ACE's in delegations
3375                  */
3376                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3377                 *p++ = cpu_to_be32(0);
3378                 *p++ = cpu_to_be32(0);
3379                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3380                 break;
3381         case NFS4_OPEN_DELEGATE_WRITE:
3382                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3383                 if (nfserr)
3384                         return nfserr;
3385                 p = xdr_reserve_space(xdr, 32);
3386                 if (!p)
3387                         return nfserr_resource;
3388                 *p++ = cpu_to_be32(0);
3389
3390                 /*
3391                  * TODO: space_limit's in delegations
3392                  */
3393                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3394                 *p++ = cpu_to_be32(~(u32)0);
3395                 *p++ = cpu_to_be32(~(u32)0);
3396
3397                 /*
3398                  * TODO: ACE's in delegations
3399                  */
3400                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3401                 *p++ = cpu_to_be32(0);
3402                 *p++ = cpu_to_be32(0);
3403                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3404                 break;
3405         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3406                 switch (open->op_why_no_deleg) {
3407                 case WND4_CONTENTION:
3408                 case WND4_RESOURCE:
3409                         p = xdr_reserve_space(xdr, 8);
3410                         if (!p)
3411                                 return nfserr_resource;
3412                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3413                         /* deleg signaling not supported yet: */
3414                         *p++ = cpu_to_be32(0);
3415                         break;
3416                 default:
3417                         p = xdr_reserve_space(xdr, 4);
3418                         if (!p)
3419                                 return nfserr_resource;
3420                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3421                 }
3422                 break;
3423         default:
3424                 BUG();
3425         }
3426         /* XXX save filehandle here */
3427         return 0;
3428 }
3429
3430 static __be32
3431 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3432 {
3433         struct xdr_stream *xdr = &resp->xdr;
3434
3435         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3436 }
3437
3438 static __be32
3439 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3440 {
3441         struct xdr_stream *xdr = &resp->xdr;
3442
3443         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3444 }
3445
3446 static __be32 nfsd4_encode_splice_read(
3447                                 struct nfsd4_compoundres *resp,
3448                                 struct nfsd4_read *read,
3449                                 struct file *file, unsigned long maxcount)
3450 {
3451         struct xdr_stream *xdr = &resp->xdr;
3452         struct xdr_buf *buf = xdr->buf;
3453         u32 eof;
3454         long len;
3455         int space_left;
3456         __be32 nfserr;
3457         __be32 *p = xdr->p - 2;
3458
3459         /* Make sure there will be room for padding if needed */
3460         if (xdr->end - xdr->p < 1)
3461                 return nfserr_resource;
3462
3463         len = maxcount;
3464         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3465                                   file, read->rd_offset, &maxcount);
3466         read->rd_length = maxcount;
3467         if (nfserr) {
3468                 /*
3469                  * nfsd_splice_actor may have already messed with the
3470                  * page length; reset it so as not to confuse
3471                  * xdr_truncate_encode:
3472                  */
3473                 buf->page_len = 0;
3474                 return nfserr;
3475         }
3476
3477         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3478                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3479
3480         *(p++) = htonl(eof);
3481         *(p++) = htonl(maxcount);
3482
3483         buf->page_len = maxcount;
3484         buf->len += maxcount;
3485         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3486                                                         / PAGE_SIZE;
3487
3488         /* Use rest of head for padding and remaining ops: */
3489         buf->tail[0].iov_base = xdr->p;
3490         buf->tail[0].iov_len = 0;
3491         xdr->iov = buf->tail;
3492         if (maxcount&3) {
3493                 int pad = 4 - (maxcount&3);
3494
3495                 *(xdr->p++) = 0;
3496
3497                 buf->tail[0].iov_base += maxcount&3;
3498                 buf->tail[0].iov_len = pad;
3499                 buf->len += pad;
3500         }
3501
3502         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3503                                 buf->buflen - buf->len);
3504         buf->buflen = buf->len + space_left;
3505         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3506
3507         return 0;
3508 }
3509
3510 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3511                                  struct nfsd4_read *read,
3512                                  struct file *file, unsigned long maxcount)
3513 {
3514         struct xdr_stream *xdr = &resp->xdr;
3515         u32 eof;
3516         int v;
3517         int starting_len = xdr->buf->len - 8;
3518         long len;
3519         int thislen;
3520         __be32 nfserr;
3521         __be32 tmp;
3522         __be32 *p;
3523         u32 zzz = 0;
3524         int pad;
3525
3526         len = maxcount;
3527         v = 0;
3528
3529         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3530         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3531         WARN_ON_ONCE(!p);
3532         resp->rqstp->rq_vec[v].iov_base = p;
3533         resp->rqstp->rq_vec[v].iov_len = thislen;
3534         v++;
3535         len -= thislen;
3536
3537         while (len) {
3538                 thislen = min_t(long, len, PAGE_SIZE);
3539                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3540                 WARN_ON_ONCE(!p);
3541                 resp->rqstp->rq_vec[v].iov_base = p;
3542                 resp->rqstp->rq_vec[v].iov_len = thislen;
3543                 v++;
3544                 len -= thislen;
3545         }
3546         read->rd_vlen = v;
3547
3548         len = maxcount;
3549         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3550                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3551         read->rd_length = maxcount;
3552         if (nfserr)
3553                 return nfserr;
3554         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3555
3556         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3557                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3558
3559         tmp = htonl(eof);
3560         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3561         tmp = htonl(maxcount);
3562         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3563
3564         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3565         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3566                                                                 &zzz, pad);
3567         return 0;
3568
3569 }
3570
3571 static __be32
3572 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3573                   struct nfsd4_read *read)
3574 {
3575         unsigned long maxcount;
3576         struct xdr_stream *xdr = &resp->xdr;
3577         struct file *file = read->rd_filp;
3578         int starting_len = xdr->buf->len;
3579         struct raparms *ra = NULL;
3580         __be32 *p;
3581
3582         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3583         if (!p) {
3584                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3585                 return nfserr_resource;
3586         }
3587         if (resp->xdr.buf->page_len &&
3588             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3589                 WARN_ON_ONCE(1);
3590                 return nfserr_resource;
3591         }
3592         xdr_commit_encode(xdr);
3593
3594         maxcount = svc_max_payload(resp->rqstp);
3595         maxcount = min_t(unsigned long, maxcount,
3596                          (xdr->buf->buflen - xdr->buf->len));
3597         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3598
3599         if (read->rd_tmp_file)
3600                 ra = nfsd_init_raparms(file);
3601
3602         if (file->f_op->splice_read &&
3603             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3604                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3605         else
3606                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3607
3608         if (ra)
3609                 nfsd_put_raparams(file, ra);
3610
3611         if (nfserr)
3612                 xdr_truncate_encode(xdr, starting_len);
3613
3614         return nfserr;
3615 }
3616
3617 static __be32
3618 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3619 {
3620         int maxcount;
3621         __be32 wire_count;
3622         int zero = 0;
3623         struct xdr_stream *xdr = &resp->xdr;
3624         int length_offset = xdr->buf->len;
3625         __be32 *p;
3626
3627         p = xdr_reserve_space(xdr, 4);
3628         if (!p)
3629                 return nfserr_resource;
3630         maxcount = PAGE_SIZE;
3631
3632         p = xdr_reserve_space(xdr, maxcount);
3633         if (!p)
3634                 return nfserr_resource;
3635         /*
3636          * XXX: By default, vfs_readlink() will truncate symlinks if they
3637          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3638          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3639          * that truncation occurred, and return NFS4ERR_RESOURCE.
3640          */
3641         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3642                                                 (char *)p, &maxcount);
3643         if (nfserr == nfserr_isdir)
3644                 nfserr = nfserr_inval;
3645         if (nfserr) {
3646                 xdr_truncate_encode(xdr, length_offset);
3647                 return nfserr;
3648         }
3649
3650         wire_count = htonl(maxcount);
3651         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3652         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3653         if (maxcount & 3)
3654                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3655                                                 &zero, 4 - (maxcount&3));
3656         return 0;
3657 }
3658
3659 static __be32
3660 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3661 {
3662         int maxcount;
3663         int bytes_left;
3664         loff_t offset;
3665         __be64 wire_offset;
3666         struct xdr_stream *xdr = &resp->xdr;
3667         int starting_len = xdr->buf->len;
3668         __be32 *p;
3669
3670         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3671         if (!p)
3672                 return nfserr_resource;
3673
3674         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3675         *p++ = cpu_to_be32(0);
3676         *p++ = cpu_to_be32(0);
3677         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3678                                 - (char *)resp->xdr.buf->head[0].iov_base;
3679
3680         /*
3681          * Number of bytes left for directory entries allowing for the
3682          * final 8 bytes of the readdir and a following failed op:
3683          */
3684         bytes_left = xdr->buf->buflen - xdr->buf->len
3685                         - COMPOUND_ERR_SLACK_SPACE - 8;
3686         if (bytes_left < 0) {
3687                 nfserr = nfserr_resource;
3688                 goto err_no_verf;
3689         }
3690         maxcount = svc_max_payload(resp->rqstp);
3691         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3692         /*
3693          * Note the rfc defines rd_maxcount as the size of the
3694          * READDIR4resok structure, which includes the verifier above
3695          * and the 8 bytes encoded at the end of this function:
3696          */
3697         if (maxcount < 16) {
3698                 nfserr = nfserr_toosmall;
3699                 goto err_no_verf;
3700         }
3701         maxcount = min_t(int, maxcount-16, bytes_left);
3702
3703         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3704         if (!readdir->rd_dircount)
3705                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3706
3707         readdir->xdr = xdr;
3708         readdir->rd_maxcount = maxcount;
3709         readdir->common.err = 0;
3710         readdir->cookie_offset = 0;
3711
3712         offset = readdir->rd_cookie;
3713         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3714                               &offset,
3715                               &readdir->common, nfsd4_encode_dirent);
3716         if (nfserr == nfs_ok &&
3717             readdir->common.err == nfserr_toosmall &&
3718             xdr->buf->len == starting_len + 8) {
3719                 /* nothing encoded; which limit did we hit?: */
3720                 if (maxcount - 16 < bytes_left)
3721                         /* It was the fault of rd_maxcount: */
3722                         nfserr = nfserr_toosmall;
3723                 else
3724                         /* We ran out of buffer space: */
3725                         nfserr = nfserr_resource;
3726         }
3727         if (nfserr)
3728                 goto err_no_verf;
3729
3730         if (readdir->cookie_offset) {
3731                 wire_offset = cpu_to_be64(offset);
3732                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3733                                                         &wire_offset, 8);
3734         }
3735
3736         p = xdr_reserve_space(xdr, 8);
3737         if (!p) {
3738                 WARN_ON_ONCE(1);
3739                 goto err_no_verf;
3740         }
3741         *p++ = 0;       /* no more entries */
3742         *p++ = htonl(readdir->common.err == nfserr_eof);
3743
3744         return 0;
3745 err_no_verf:
3746         xdr_truncate_encode(xdr, starting_len);
3747         return nfserr;
3748 }
3749
3750 static __be32
3751 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3752 {
3753         struct xdr_stream *xdr = &resp->xdr;
3754         __be32 *p;
3755
3756         p = xdr_reserve_space(xdr, 20);
3757         if (!p)
3758                 return nfserr_resource;
3759         p = encode_cinfo(p, &remove->rm_cinfo);
3760         return 0;
3761 }
3762
3763 static __be32
3764 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3765 {
3766         struct xdr_stream *xdr = &resp->xdr;
3767         __be32 *p;
3768
3769         p = xdr_reserve_space(xdr, 40);
3770         if (!p)
3771                 return nfserr_resource;
3772         p = encode_cinfo(p, &rename->rn_sinfo);
3773         p = encode_cinfo(p, &rename->rn_tinfo);
3774         return 0;
3775 }
3776
3777 static __be32
3778 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3779 {
3780         u32 i, nflavs, supported;
3781         struct exp_flavor_info *flavs;
3782         struct exp_flavor_info def_flavs[2];
3783         __be32 *p, *flavorsp;
3784         static bool report = true;
3785
3786         if (exp->ex_nflavors) {
3787                 flavs = exp->ex_flavors;
3788                 nflavs = exp->ex_nflavors;
3789         } else { /* Handling of some defaults in absence of real secinfo: */
3790                 flavs = def_flavs;
3791                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3792                         nflavs = 2;
3793                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3794                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3795                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3796                         nflavs = 1;
3797                         flavs[0].pseudoflavor
3798                                         = svcauth_gss_flavor(exp->ex_client);
3799                 } else {
3800                         nflavs = 1;
3801                         flavs[0].pseudoflavor
3802                                         = exp->ex_client->flavour->flavour;
3803                 }
3804         }
3805
3806         supported = 0;
3807         p = xdr_reserve_space(xdr, 4);
3808         if (!p)
3809                 return nfserr_resource;
3810         flavorsp = p++;         /* to be backfilled later */
3811
3812         for (i = 0; i < nflavs; i++) {
3813                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3814                 struct rpcsec_gss_info info;
3815
3816                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3817                         supported++;
3818                         p = xdr_reserve_space(xdr, 4 + 4 +
3819                                               XDR_LEN(info.oid.len) + 4 + 4);
3820                         if (!p)
3821                                 return nfserr_resource;
3822                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3823                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3824                         *p++ = cpu_to_be32(info.qop);
3825                         *p++ = cpu_to_be32(info.service);
3826                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3827                         supported++;
3828                         p = xdr_reserve_space(xdr, 4);
3829                         if (!p)
3830                                 return nfserr_resource;
3831                         *p++ = cpu_to_be32(pf);
3832                 } else {
3833                         if (report)
3834                                 pr_warn("NFS: SECINFO: security flavor %u "
3835                                         "is not supported\n", pf);
3836                 }
3837         }
3838
3839         if (nflavs != supported)
3840                 report = false;
3841         *flavorsp = htonl(supported);
3842         return 0;
3843 }
3844
3845 static __be32
3846 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3847                      struct nfsd4_secinfo *secinfo)
3848 {
3849         struct xdr_stream *xdr = &resp->xdr;
3850
3851         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3852 }
3853
3854 static __be32
3855 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3856                      struct nfsd4_secinfo_no_name *secinfo)
3857 {
3858         struct xdr_stream *xdr = &resp->xdr;
3859
3860         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3861 }
3862
3863 /*
3864  * The SETATTR encode routine is special -- it always encodes a bitmap,
3865  * regardless of the error status.
3866  */
3867 static __be32
3868 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3869 {
3870         struct xdr_stream *xdr = &resp->xdr;
3871         __be32 *p;
3872
3873         p = xdr_reserve_space(xdr, 16);
3874         if (!p)
3875                 return nfserr_resource;
3876         if (nfserr) {
3877                 *p++ = cpu_to_be32(3);
3878                 *p++ = cpu_to_be32(0);
3879                 *p++ = cpu_to_be32(0);
3880                 *p++ = cpu_to_be32(0);
3881         }
3882         else {
3883                 *p++ = cpu_to_be32(3);
3884                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3885                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3886                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3887         }
3888         return nfserr;
3889 }
3890
3891 static __be32
3892 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3893 {
3894         struct xdr_stream *xdr = &resp->xdr;
3895         __be32 *p;
3896
3897         if (!nfserr) {
3898                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3899                 if (!p)
3900                         return nfserr_resource;
3901                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3902                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3903                                                 NFS4_VERIFIER_SIZE);
3904         }
3905         else if (nfserr == nfserr_clid_inuse) {
3906                 p = xdr_reserve_space(xdr, 8);
3907                 if (!p)
3908                         return nfserr_resource;
3909                 *p++ = cpu_to_be32(0);
3910                 *p++ = cpu_to_be32(0);
3911         }
3912         return nfserr;
3913 }
3914
3915 static __be32
3916 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3917 {
3918         struct xdr_stream *xdr = &resp->xdr;
3919         __be32 *p;
3920
3921         p = xdr_reserve_space(xdr, 16);
3922         if (!p)
3923                 return nfserr_resource;
3924         *p++ = cpu_to_be32(write->wr_bytes_written);
3925         *p++ = cpu_to_be32(write->wr_how_written);
3926         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3927                                                 NFS4_VERIFIER_SIZE);
3928         return 0;
3929 }
3930
3931 static __be32
3932 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3933                          struct nfsd4_exchange_id *exid)
3934 {
3935         struct xdr_stream *xdr = &resp->xdr;
3936         __be32 *p;
3937         char *major_id;
3938         char *server_scope;
3939         int major_id_sz;
3940         int server_scope_sz;
3941         uint64_t minor_id = 0;
3942
3943         major_id = utsname()->nodename;
3944         major_id_sz = strlen(major_id);
3945         server_scope = utsname()->nodename;
3946         server_scope_sz = strlen(server_scope);
3947
3948         p = xdr_reserve_space(xdr,
3949                 8 /* eir_clientid */ +
3950                 4 /* eir_sequenceid */ +
3951                 4 /* eir_flags */ +
3952                 4 /* spr_how */);
3953         if (!p)
3954                 return nfserr_resource;
3955
3956         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3957         *p++ = cpu_to_be32(exid->seqid);
3958         *p++ = cpu_to_be32(exid->flags);
3959
3960         *p++ = cpu_to_be32(exid->spa_how);
3961
3962         switch (exid->spa_how) {
3963         case SP4_NONE:
3964                 break;
3965         case SP4_MACH_CRED:
3966                 /* spo_must_enforce bitmap: */
3967                 nfserr = nfsd4_encode_bitmap(xdr,
3968                                         exid->spo_must_enforce[0],
3969                                         exid->spo_must_enforce[1],
3970                                         exid->spo_must_enforce[2]);
3971                 if (nfserr)
3972                         return nfserr;
3973                 /* spo_must_allow bitmap: */
3974                 nfserr = nfsd4_encode_bitmap(xdr,
3975                                         exid->spo_must_allow[0],
3976                                         exid->spo_must_allow[1],
3977                                         exid->spo_must_allow[2]);
3978                 if (nfserr)
3979                         return nfserr;
3980                 break;
3981         default:
3982                 WARN_ON_ONCE(1);
3983         }
3984
3985         p = xdr_reserve_space(xdr,
3986                 8 /* so_minor_id */ +
3987                 4 /* so_major_id.len */ +
3988                 (XDR_QUADLEN(major_id_sz) * 4) +
3989                 4 /* eir_server_scope.len */ +
3990                 (XDR_QUADLEN(server_scope_sz) * 4) +
3991                 4 /* eir_server_impl_id.count (0) */);
3992         if (!p)
3993                 return nfserr_resource;
3994
3995         /* The server_owner struct */
3996         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3997         /* major id */
3998         p = xdr_encode_opaque(p, major_id, major_id_sz);
3999
4000         /* Server scope */
4001         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4002
4003         /* Implementation id */
4004         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4005         return 0;
4006 }
4007
4008 static __be32
4009 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4010                             struct nfsd4_create_session *sess)
4011 {
4012         struct xdr_stream *xdr = &resp->xdr;
4013         __be32 *p;
4014
4015         p = xdr_reserve_space(xdr, 24);
4016         if (!p)
4017                 return nfserr_resource;
4018         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4019                                         NFS4_MAX_SESSIONID_LEN);
4020         *p++ = cpu_to_be32(sess->seqid);
4021         *p++ = cpu_to_be32(sess->flags);
4022
4023         p = xdr_reserve_space(xdr, 28);
4024         if (!p)
4025                 return nfserr_resource;
4026         *p++ = cpu_to_be32(0); /* headerpadsz */
4027         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4028         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4029         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4030         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4031         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4032         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4033
4034         if (sess->fore_channel.nr_rdma_attrs) {
4035                 p = xdr_reserve_space(xdr, 4);
4036                 if (!p)
4037                         return nfserr_resource;
4038                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4039         }
4040
4041         p = xdr_reserve_space(xdr, 28);
4042         if (!p)
4043                 return nfserr_resource;
4044         *p++ = cpu_to_be32(0); /* headerpadsz */
4045         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4046         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4047         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4048         *p++ = cpu_to_be32(sess->back_channel.maxops);
4049         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4050         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4051
4052         if (sess->back_channel.nr_rdma_attrs) {
4053                 p = xdr_reserve_space(xdr, 4);
4054                 if (!p)
4055                         return nfserr_resource;
4056                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4057         }
4058         return 0;
4059 }
4060
4061 static __be32
4062 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4063                       struct nfsd4_sequence *seq)
4064 {
4065         struct xdr_stream *xdr = &resp->xdr;
4066         __be32 *p;
4067
4068         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4069         if (!p)
4070                 return nfserr_resource;
4071         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4072                                         NFS4_MAX_SESSIONID_LEN);
4073         *p++ = cpu_to_be32(seq->seqid);
4074         *p++ = cpu_to_be32(seq->slotid);
4075         /* Note slotid's are numbered from zero: */
4076         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4077         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4078         *p++ = cpu_to_be32(seq->status_flags);
4079
4080         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4081         return 0;
4082 }
4083
4084 static __be32
4085 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4086                           struct nfsd4_test_stateid *test_stateid)
4087 {
4088         struct xdr_stream *xdr = &resp->xdr;
4089         struct nfsd4_test_stateid_id *stateid, *next;
4090         __be32 *p;
4091
4092         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4093         if (!p)
4094                 return nfserr_resource;
4095         *p++ = htonl(test_stateid->ts_num_ids);
4096
4097         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4098                 *p++ = stateid->ts_id_status;
4099         }
4100
4101         return 0;
4102 }
4103
4104 #ifdef CONFIG_NFSD_PNFS
4105 static __be32
4106 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4107                 struct nfsd4_getdeviceinfo *gdev)
4108 {
4109         struct xdr_stream *xdr = &resp->xdr;
4110         const struct nfsd4_layout_ops *ops;
4111         u32 starting_len = xdr->buf->len, needed_len;
4112         __be32 *p;
4113
4114         p = xdr_reserve_space(xdr, 4);
4115         if (!p)
4116                 return nfserr_resource;
4117
4118         *p++ = cpu_to_be32(gdev->gd_layout_type);
4119
4120         /* If maxcount is 0 then just update notifications */
4121         if (gdev->gd_maxcount != 0) {
4122                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4123                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4124                 if (nfserr) {
4125                         /*
4126                          * We don't bother to burden the layout drivers with
4127                          * enforcing gd_maxcount, just tell the client to
4128                          * come back with a bigger buffer if it's not enough.
4129                          */
4130                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4131                                 goto toosmall;
4132                         return nfserr;
4133                 }
4134         }
4135
4136         if (gdev->gd_notify_types) {
4137                 p = xdr_reserve_space(xdr, 4 + 4);
4138                 if (!p)
4139                         return nfserr_resource;
4140                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4141                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4142         } else {
4143                 p = xdr_reserve_space(xdr, 4);
4144                 if (!p)
4145                         return nfserr_resource;
4146                 *p++ = 0;
4147         }
4148
4149         return 0;
4150 toosmall:
4151         dprintk("%s: maxcount too small\n", __func__);
4152         needed_len = xdr->buf->len + 4 /* notifications */;
4153         xdr_truncate_encode(xdr, starting_len);
4154         p = xdr_reserve_space(xdr, 4);
4155         if (!p)
4156                 return nfserr_resource;
4157         *p++ = cpu_to_be32(needed_len);
4158         return nfserr_toosmall;
4159 }
4160
4161 static __be32
4162 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4163                 struct nfsd4_layoutget *lgp)
4164 {
4165         struct xdr_stream *xdr = &resp->xdr;
4166         const struct nfsd4_layout_ops *ops;
4167         __be32 *p;
4168
4169         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4170         if (!p)
4171                 return nfserr_resource;
4172
4173         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4174         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4175         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4176                                     sizeof(stateid_opaque_t));
4177
4178         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4179         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4180         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4181         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4182         *p++ = cpu_to_be32(lgp->lg_layout_type);
4183
4184         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4185         return ops->encode_layoutget(xdr, lgp);
4186 }
4187
4188 static __be32
4189 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4190                           struct nfsd4_layoutcommit *lcp)
4191 {
4192         struct xdr_stream *xdr = &resp->xdr;
4193         __be32 *p;
4194
4195         p = xdr_reserve_space(xdr, 4);
4196         if (!p)
4197                 return nfserr_resource;
4198         *p++ = cpu_to_be32(lcp->lc_size_chg);
4199         if (lcp->lc_size_chg) {
4200                 p = xdr_reserve_space(xdr, 8);
4201                 if (!p)
4202                         return nfserr_resource;
4203                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4204         }
4205
4206         return 0;
4207 }
4208
4209 static __be32
4210 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4211                 struct nfsd4_layoutreturn *lrp)
4212 {
4213         struct xdr_stream *xdr = &resp->xdr;
4214         __be32 *p;
4215
4216         p = xdr_reserve_space(xdr, 4);
4217         if (!p)
4218                 return nfserr_resource;
4219         *p++ = cpu_to_be32(lrp->lrs_present);
4220         if (lrp->lrs_present)
4221                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4222         return 0;
4223 }
4224 #endif /* CONFIG_NFSD_PNFS */
4225
4226 static __be32
4227 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4228 {
4229         __be32 *p;
4230
4231         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4232         if (!p)
4233                 return nfserr_resource;
4234
4235         *p++ = cpu_to_be32(0);
4236         p = xdr_encode_hyper(p, write->wr_bytes_written);
4237         *p++ = cpu_to_be32(write->wr_stable_how);
4238         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4239                                     NFS4_VERIFIER_SIZE);
4240         return nfs_ok;
4241 }
4242
4243 static __be32
4244 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4245                   struct nfsd4_copy *copy)
4246 {
4247         __be32 *p;
4248
4249         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4250         if (nfserr)
4251                 return nfserr;
4252
4253         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4254         *p++ = xdr_one; /* cr_consecutive */
4255         *p++ = cpu_to_be32(copy->cp_synchronous);
4256         return 0;
4257 }
4258
4259 static __be32
4260 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4261                   struct nfsd4_seek *seek)
4262 {
4263         __be32 *p;
4264
4265         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4266         *p++ = cpu_to_be32(seek->seek_eof);
4267         p = xdr_encode_hyper(p, seek->seek_pos);
4268
4269         return 0;
4270 }
4271
4272 static __be32
4273 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4274 {
4275         return nfserr;
4276 }
4277
4278 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4279
4280 /*
4281  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4282  * since we don't need to filter out obsolete ops as this is
4283  * done in the decoding phase.
4284  */
4285 static const nfsd4_enc nfsd4_enc_ops[] = {
4286         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4287         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4288         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4289         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4290         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4291         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4292         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4293         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4294         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4295         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4296         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4297         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4298         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4299         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4300         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4301         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4302         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4303         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4304         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4305         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4306         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4307         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4308         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4309         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4310         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4311         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4312         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4313         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4314         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4315         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4316         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4317         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4318         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4319         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4320         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4321         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4322         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4323
4324         /* NFSv4.1 operations */
4325         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4326         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4327         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4328         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4329         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4330         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4331         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4332 #ifdef CONFIG_NFSD_PNFS
4333         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4334         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4335         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4336         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4337         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4338 #else
4339         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4340         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4341         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4342         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4343         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4344 #endif
4345         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4346         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4347         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4348         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4349         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4350         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4351         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4352
4353         /* NFSv4.2 operations */
4354         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4355         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4356         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4357         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4358         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4359         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4360         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4361         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4362         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4363         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4364         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4365         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4366         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4367 };
4368
4369 /*
4370  * Calculate whether we still have space to encode repsize bytes.
4371  * There are two considerations:
4372  *     - For NFS versions >=4.1, the size of the reply must stay within
4373  *       session limits
4374  *     - For all NFS versions, we must stay within limited preallocated
4375  *       buffer space.
4376  *
4377  * This is called before the operation is processed, so can only provide
4378  * an upper estimate.  For some nonidempotent operations (such as
4379  * getattr), it's not necessarily a problem if that estimate is wrong,
4380  * as we can fail it after processing without significant side effects.
4381  */
4382 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4383 {
4384         struct xdr_buf *buf = &resp->rqstp->rq_res;
4385         struct nfsd4_slot *slot = resp->cstate.slot;
4386
4387         if (buf->len + respsize <= buf->buflen)
4388                 return nfs_ok;
4389         if (!nfsd4_has_session(&resp->cstate))
4390                 return nfserr_resource;
4391         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4392                 WARN_ON_ONCE(1);
4393                 return nfserr_rep_too_big_to_cache;
4394         }
4395         return nfserr_rep_too_big;
4396 }
4397
4398 void
4399 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4400 {
4401         struct xdr_stream *xdr = &resp->xdr;
4402         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4403         struct svc_rqst *rqstp = resp->rqstp;
4404         const struct nfsd4_operation *opdesc = op->opdesc;
4405         int post_err_offset;
4406         nfsd4_enc encoder;
4407         __be32 *p;
4408
4409         p = xdr_reserve_space(xdr, 8);
4410         if (!p) {
4411                 WARN_ON_ONCE(1);
4412                 return;
4413         }
4414         *p++ = cpu_to_be32(op->opnum);
4415         post_err_offset = xdr->buf->len;
4416
4417         if (op->opnum == OP_ILLEGAL)
4418                 goto status;
4419         if (op->status && opdesc &&
4420                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4421                 goto status;
4422         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4423                !nfsd4_enc_ops[op->opnum]);
4424         encoder = nfsd4_enc_ops[op->opnum];
4425         op->status = encoder(resp, op->status, &op->u);
4426         if (opdesc && opdesc->op_release)
4427                 opdesc->op_release(&op->u);
4428         xdr_commit_encode(xdr);
4429
4430         /* nfsd4_check_resp_size guarantees enough room for error status */
4431         if (!op->status) {
4432                 int space_needed = 0;
4433                 if (!nfsd4_last_compound_op(rqstp))
4434                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4435                 op->status = nfsd4_check_resp_size(resp, space_needed);
4436         }
4437         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4438                 struct nfsd4_slot *slot = resp->cstate.slot;
4439
4440                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4441                         op->status = nfserr_rep_too_big_to_cache;
4442                 else
4443                         op->status = nfserr_rep_too_big;
4444         }
4445         if (op->status == nfserr_resource ||
4446             op->status == nfserr_rep_too_big ||
4447             op->status == nfserr_rep_too_big_to_cache) {
4448                 /*
4449                  * The operation may have already been encoded or
4450                  * partially encoded.  No op returns anything additional
4451                  * in the case of one of these three errors, so we can
4452                  * just truncate back to after the status.  But it's a
4453                  * bug if we had to do this on a non-idempotent op:
4454                  */
4455                 warn_on_nonidempotent_op(op);
4456                 xdr_truncate_encode(xdr, post_err_offset);
4457         }
4458         if (so) {
4459                 int len = xdr->buf->len - post_err_offset;
4460
4461                 so->so_replay.rp_status = op->status;
4462                 so->so_replay.rp_buflen = len;
4463                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4464                                                 so->so_replay.rp_buf, len);
4465         }
4466 status:
4467         /* Note that op->status is already in network byte order: */
4468         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4469 }
4470
4471 /* 
4472  * Encode the reply stored in the stateowner reply cache 
4473  * 
4474  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4475  * previously sent already encoded operation.
4476  */
4477 void
4478 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4479 {
4480         __be32 *p;
4481         struct nfs4_replay *rp = op->replay;
4482
4483         BUG_ON(!rp);
4484
4485         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4486         if (!p) {
4487                 WARN_ON_ONCE(1);
4488                 return;
4489         }
4490         *p++ = cpu_to_be32(op->opnum);
4491         *p++ = rp->rp_status;  /* already xdr'ed */
4492
4493         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4494 }
4495
4496 int
4497 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4498 {
4499         return xdr_ressize_check(rqstp, p);
4500 }
4501
4502 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4503 {
4504         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4505
4506         if (args->ops != args->iops) {
4507                 kfree(args->ops);
4508                 args->ops = args->iops;
4509         }
4510         kfree(args->tmpp);
4511         args->tmpp = NULL;
4512         while (args->to_free) {
4513                 struct svcxdr_tmpbuf *tb = args->to_free;
4514                 args->to_free = tb->next;
4515                 kfree(tb);
4516         }
4517 }
4518
4519 int
4520 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4521 {
4522         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4523
4524         if (rqstp->rq_arg.head[0].iov_len % 4) {
4525                 /* client is nuts */
4526                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4527                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4528                 return 0;
4529         }
4530         args->p = p;
4531         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4532         args->pagelist = rqstp->rq_arg.pages;
4533         args->pagelen = rqstp->rq_arg.page_len;
4534         args->tail = false;
4535         args->tmpp = NULL;
4536         args->to_free = NULL;
4537         args->ops = args->iops;
4538         args->rqstp = rqstp;
4539
4540         return !nfsd4_decode_compound(args);
4541 }
4542
4543 int
4544 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4545 {
4546         /*
4547          * All that remains is to write the tag and operation count...
4548          */
4549         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4550         struct xdr_buf *buf = resp->xdr.buf;
4551
4552         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4553                                  buf->tail[0].iov_len);
4554
4555         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4556
4557         p = resp->tagp;
4558         *p++ = htonl(resp->taglen);
4559         memcpy(p, resp->tag, resp->taglen);
4560         p += XDR_QUADLEN(resp->taglen);
4561         *p++ = htonl(resp->opcnt);
4562
4563         nfsd4_sequence_done(resp);
4564         return 1;
4565 }
4566
4567 /*
4568  * Local variables:
4569  *  c-basic-offset: 8
4570  * End:
4571  */