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TOMOYO Linux Cross Reference
Linux/fs/nfsd/nfs4xdr.c

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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         int expected_len, len = 0;
324         u32 dummy32;
325         char *buf;
326 
327         DECODE_HEAD;
328         iattr->ia_valid = 0;
329         if ((status = nfsd4_decode_bitmap(argp, bmval)))
330                 return status;
331 
332         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
333             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
334             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
335                 if (nfsd_attrs_supported(argp->minorversion, bmval))
336                         return nfserr_inval;
337                 return nfserr_attrnotsupp;
338         }
339 
340         READ_BUF(4);
341         expected_len = be32_to_cpup(p++);
342 
343         if (bmval[0] & FATTR4_WORD0_SIZE) {
344                 READ_BUF(8);
345                 len += 8;
346                 p = xdr_decode_hyper(p, &iattr->ia_size);
347                 iattr->ia_valid |= ATTR_SIZE;
348         }
349         if (bmval[0] & FATTR4_WORD0_ACL) {
350                 u32 nace;
351                 struct nfs4_ace *ace;
352 
353                 READ_BUF(4); len += 4;
354                 nace = be32_to_cpup(p++);
355 
356                 if (nace > NFS4_ACL_MAX)
357                         return nfserr_fbig;
358 
359                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
360                 if (*acl == NULL)
361                         return nfserr_jukebox;
362 
363                 (*acl)->naces = nace;
364                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
365                         READ_BUF(16); len += 16;
366                         ace->type = be32_to_cpup(p++);
367                         ace->flag = be32_to_cpup(p++);
368                         ace->access_mask = be32_to_cpup(p++);
369                         dummy32 = be32_to_cpup(p++);
370                         READ_BUF(dummy32);
371                         len += XDR_QUADLEN(dummy32) << 2;
372                         READMEM(buf, dummy32);
373                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
374                         status = nfs_ok;
375                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
376                                 ;
377                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
378                                 status = nfsd_map_name_to_gid(argp->rqstp,
379                                                 buf, dummy32, &ace->who_gid);
380                         else
381                                 status = nfsd_map_name_to_uid(argp->rqstp,
382                                                 buf, dummy32, &ace->who_uid);
383                         if (status)
384                                 return status;
385                 }
386         } else
387                 *acl = NULL;
388         if (bmval[1] & FATTR4_WORD1_MODE) {
389                 READ_BUF(4);
390                 len += 4;
391                 iattr->ia_mode = be32_to_cpup(p++);
392                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
393                 iattr->ia_valid |= ATTR_MODE;
394         }
395         if (bmval[1] & FATTR4_WORD1_OWNER) {
396                 READ_BUF(4);
397                 len += 4;
398                 dummy32 = be32_to_cpup(p++);
399                 READ_BUF(dummy32);
400                 len += (XDR_QUADLEN(dummy32) << 2);
401                 READMEM(buf, dummy32);
402                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
403                         return status;
404                 iattr->ia_valid |= ATTR_UID;
405         }
406         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
407                 READ_BUF(4);
408                 len += 4;
409                 dummy32 = be32_to_cpup(p++);
410                 READ_BUF(dummy32);
411                 len += (XDR_QUADLEN(dummy32) << 2);
412                 READMEM(buf, dummy32);
413                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
414                         return status;
415                 iattr->ia_valid |= ATTR_GID;
416         }
417         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
418                 READ_BUF(4);
419                 len += 4;
420                 dummy32 = be32_to_cpup(p++);
421                 switch (dummy32) {
422                 case NFS4_SET_TO_CLIENT_TIME:
423                         len += 12;
424                         status = nfsd4_decode_time(argp, &iattr->ia_atime);
425                         if (status)
426                                 return status;
427                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
428                         break;
429                 case NFS4_SET_TO_SERVER_TIME:
430                         iattr->ia_valid |= ATTR_ATIME;
431                         break;
432                 default:
433                         goto xdr_error;
434                 }
435         }
436         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
437                 READ_BUF(4);
438                 len += 4;
439                 dummy32 = be32_to_cpup(p++);
440                 switch (dummy32) {
441                 case NFS4_SET_TO_CLIENT_TIME:
442                         len += 12;
443                         status = nfsd4_decode_time(argp, &iattr->ia_mtime);
444                         if (status)
445                                 return status;
446                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
447                         break;
448                 case NFS4_SET_TO_SERVER_TIME:
449                         iattr->ia_valid |= ATTR_MTIME;
450                         break;
451                 default:
452                         goto xdr_error;
453                 }
454         }
455 
456         label->len = 0;
457         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
458             bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
459                 READ_BUF(4);
460                 len += 4;
461                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
462                 READ_BUF(4);
463                 len += 4;
464                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
465                 READ_BUF(4);
466                 len += 4;
467                 dummy32 = be32_to_cpup(p++);
468                 READ_BUF(dummy32);
469                 if (dummy32 > NFS4_MAXLABELLEN)
470                         return nfserr_badlabel;
471                 len += (XDR_QUADLEN(dummy32) << 2);
472                 READMEM(buf, dummy32);
473                 label->len = dummy32;
474                 label->data = svcxdr_dupstr(argp, buf, dummy32);
475                 if (!label->data)
476                         return nfserr_jukebox;
477         }
478         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
479                 if (!umask)
480                         goto xdr_error;
481                 READ_BUF(8);
482                 len += 8;
483                 dummy32 = be32_to_cpup(p++);
484                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
485                 dummy32 = be32_to_cpup(p++);
486                 *umask = dummy32 & S_IRWXUGO;
487                 iattr->ia_valid |= ATTR_MODE;
488         }
489         if (len != expected_len)
490                 goto xdr_error;
491 
492         DECODE_TAIL;
493 }
494 
495 static __be32
496 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
497 {
498         DECODE_HEAD;
499 
500         READ_BUF(sizeof(stateid_t));
501         sid->si_generation = be32_to_cpup(p++);
502         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
503 
504         DECODE_TAIL;
505 }
506 
507 static __be32
508 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
509 {
510         DECODE_HEAD;
511 
512         READ_BUF(4);
513         access->ac_req_access = be32_to_cpup(p++);
514 
515         DECODE_TAIL;
516 }
517 
518 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
519 {
520         DECODE_HEAD;
521         u32 dummy, uid, gid;
522         char *machine_name;
523         int i;
524         int nr_secflavs;
525 
526         /* callback_sec_params4 */
527         READ_BUF(4);
528         nr_secflavs = be32_to_cpup(p++);
529         if (nr_secflavs)
530                 cbs->flavor = (u32)(-1);
531         else
532                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
533                 cbs->flavor = 0;
534         for (i = 0; i < nr_secflavs; ++i) {
535                 READ_BUF(4);
536                 dummy = be32_to_cpup(p++);
537                 switch (dummy) {
538                 case RPC_AUTH_NULL:
539                         /* Nothing to read */
540                         if (cbs->flavor == (u32)(-1))
541                                 cbs->flavor = RPC_AUTH_NULL;
542                         break;
543                 case RPC_AUTH_UNIX:
544                         READ_BUF(8);
545                         /* stamp */
546                         dummy = be32_to_cpup(p++);
547 
548                         /* machine name */
549                         dummy = be32_to_cpup(p++);
550                         READ_BUF(dummy);
551                         SAVEMEM(machine_name, dummy);
552 
553                         /* uid, gid */
554                         READ_BUF(8);
555                         uid = be32_to_cpup(p++);
556                         gid = be32_to_cpup(p++);
557 
558                         /* more gids */
559                         READ_BUF(4);
560                         dummy = be32_to_cpup(p++);
561                         READ_BUF(dummy * 4);
562                         if (cbs->flavor == (u32)(-1)) {
563                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
564                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
565                                 if (uid_valid(kuid) && gid_valid(kgid)) {
566                                         cbs->uid = kuid;
567                                         cbs->gid = kgid;
568                                         cbs->flavor = RPC_AUTH_UNIX;
569                                 } else {
570                                         dprintk("RPC_AUTH_UNIX with invalid"
571                                                 "uid or gid ignoring!\n");
572                                 }
573                         }
574                         break;
575                 case RPC_AUTH_GSS:
576                         dprintk("RPC_AUTH_GSS callback secflavor "
577                                 "not supported!\n");
578                         READ_BUF(8);
579                         /* gcbp_service */
580                         dummy = be32_to_cpup(p++);
581                         /* gcbp_handle_from_server */
582                         dummy = be32_to_cpup(p++);
583                         READ_BUF(dummy);
584                         p += XDR_QUADLEN(dummy);
585                         /* gcbp_handle_from_client */
586                         READ_BUF(4);
587                         dummy = be32_to_cpup(p++);
588                         READ_BUF(dummy);
589                         break;
590                 default:
591                         dprintk("Illegal callback secflavor\n");
592                         return nfserr_inval;
593                 }
594         }
595         DECODE_TAIL;
596 }
597 
598 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
599 {
600         DECODE_HEAD;
601 
602         READ_BUF(4);
603         bc->bc_cb_program = be32_to_cpup(p++);
604         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
605 
606         DECODE_TAIL;
607 }
608 
609 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
610 {
611         DECODE_HEAD;
612 
613         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
614         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
615         bcts->dir = be32_to_cpup(p++);
616         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
617          * could help us figure out we should be using it. */
618         DECODE_TAIL;
619 }
620 
621 static __be32
622 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
623 {
624         DECODE_HEAD;
625 
626         READ_BUF(4);
627         close->cl_seqid = be32_to_cpup(p++);
628         return nfsd4_decode_stateid(argp, &close->cl_stateid);
629 
630         DECODE_TAIL;
631 }
632 
633 
634 static __be32
635 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
636 {
637         DECODE_HEAD;
638 
639         READ_BUF(12);
640         p = xdr_decode_hyper(p, &commit->co_offset);
641         commit->co_count = be32_to_cpup(p++);
642 
643         DECODE_TAIL;
644 }
645 
646 static __be32
647 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
648 {
649         DECODE_HEAD;
650 
651         READ_BUF(4);
652         create->cr_type = be32_to_cpup(p++);
653         switch (create->cr_type) {
654         case NF4LNK:
655                 READ_BUF(4);
656                 create->cr_datalen = be32_to_cpup(p++);
657                 READ_BUF(create->cr_datalen);
658                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
659                 if (!create->cr_data)
660                         return nfserr_jukebox;
661                 break;
662         case NF4BLK:
663         case NF4CHR:
664                 READ_BUF(8);
665                 create->cr_specdata1 = be32_to_cpup(p++);
666                 create->cr_specdata2 = be32_to_cpup(p++);
667                 break;
668         case NF4SOCK:
669         case NF4FIFO:
670         case NF4DIR:
671         default:
672                 break;
673         }
674 
675         READ_BUF(4);
676         create->cr_namelen = be32_to_cpup(p++);
677         READ_BUF(create->cr_namelen);
678         SAVEMEM(create->cr_name, create->cr_namelen);
679         if ((status = check_filename(create->cr_name, create->cr_namelen)))
680                 return status;
681 
682         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
683                                     &create->cr_acl, &create->cr_label,
684                                     &create->cr_umask);
685         if (status)
686                 goto out;
687 
688         DECODE_TAIL;
689 }
690 
691 static inline __be32
692 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
693 {
694         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
695 }
696 
697 static inline __be32
698 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
699 {
700         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
701 }
702 
703 static __be32
704 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
705 {
706         DECODE_HEAD;
707 
708         READ_BUF(4);
709         link->li_namelen = be32_to_cpup(p++);
710         READ_BUF(link->li_namelen);
711         SAVEMEM(link->li_name, link->li_namelen);
712         if ((status = check_filename(link->li_name, link->li_namelen)))
713                 return status;
714 
715         DECODE_TAIL;
716 }
717 
718 static __be32
719 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
720 {
721         DECODE_HEAD;
722 
723         /*
724         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
725         */
726         READ_BUF(28);
727         lock->lk_type = be32_to_cpup(p++);
728         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
729                 goto xdr_error;
730         lock->lk_reclaim = be32_to_cpup(p++);
731         p = xdr_decode_hyper(p, &lock->lk_offset);
732         p = xdr_decode_hyper(p, &lock->lk_length);
733         lock->lk_is_new = be32_to_cpup(p++);
734 
735         if (lock->lk_is_new) {
736                 READ_BUF(4);
737                 lock->lk_new_open_seqid = be32_to_cpup(p++);
738                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
739                 if (status)
740                         return status;
741                 READ_BUF(8 + sizeof(clientid_t));
742                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
743                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
744                 lock->lk_new_owner.len = be32_to_cpup(p++);
745                 READ_BUF(lock->lk_new_owner.len);
746                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
747         } else {
748                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
749                 if (status)
750                         return status;
751                 READ_BUF(4);
752                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
753         }
754 
755         DECODE_TAIL;
756 }
757 
758 static __be32
759 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
760 {
761         DECODE_HEAD;
762                         
763         READ_BUF(32);
764         lockt->lt_type = be32_to_cpup(p++);
765         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
766                 goto xdr_error;
767         p = xdr_decode_hyper(p, &lockt->lt_offset);
768         p = xdr_decode_hyper(p, &lockt->lt_length);
769         COPYMEM(&lockt->lt_clientid, 8);
770         lockt->lt_owner.len = be32_to_cpup(p++);
771         READ_BUF(lockt->lt_owner.len);
772         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
773 
774         DECODE_TAIL;
775 }
776 
777 static __be32
778 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
779 {
780         DECODE_HEAD;
781 
782         READ_BUF(8);
783         locku->lu_type = be32_to_cpup(p++);
784         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
785                 goto xdr_error;
786         locku->lu_seqid = be32_to_cpup(p++);
787         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
788         if (status)
789                 return status;
790         READ_BUF(16);
791         p = xdr_decode_hyper(p, &locku->lu_offset);
792         p = xdr_decode_hyper(p, &locku->lu_length);
793 
794         DECODE_TAIL;
795 }
796 
797 static __be32
798 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
799 {
800         DECODE_HEAD;
801 
802         READ_BUF(4);
803         lookup->lo_len = be32_to_cpup(p++);
804         READ_BUF(lookup->lo_len);
805         SAVEMEM(lookup->lo_name, lookup->lo_len);
806         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
807                 return status;
808 
809         DECODE_TAIL;
810 }
811 
812 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
813 {
814         __be32 *p;
815         u32 w;
816 
817         READ_BUF(4);
818         w = be32_to_cpup(p++);
819         *share_access = w & NFS4_SHARE_ACCESS_MASK;
820         *deleg_want = w & NFS4_SHARE_WANT_MASK;
821         if (deleg_when)
822                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
823 
824         switch (w & NFS4_SHARE_ACCESS_MASK) {
825         case NFS4_SHARE_ACCESS_READ:
826         case NFS4_SHARE_ACCESS_WRITE:
827         case NFS4_SHARE_ACCESS_BOTH:
828                 break;
829         default:
830                 return nfserr_bad_xdr;
831         }
832         w &= ~NFS4_SHARE_ACCESS_MASK;
833         if (!w)
834                 return nfs_ok;
835         if (!argp->minorversion)
836                 return nfserr_bad_xdr;
837         switch (w & NFS4_SHARE_WANT_MASK) {
838         case NFS4_SHARE_WANT_NO_PREFERENCE:
839         case NFS4_SHARE_WANT_READ_DELEG:
840         case NFS4_SHARE_WANT_WRITE_DELEG:
841         case NFS4_SHARE_WANT_ANY_DELEG:
842         case NFS4_SHARE_WANT_NO_DELEG:
843         case NFS4_SHARE_WANT_CANCEL:
844                 break;
845         default:
846                 return nfserr_bad_xdr;
847         }
848         w &= ~NFS4_SHARE_WANT_MASK;
849         if (!w)
850                 return nfs_ok;
851 
852         if (!deleg_when)        /* open_downgrade */
853                 return nfserr_inval;
854         switch (w) {
855         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
856         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
857         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
858               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
859                 return nfs_ok;
860         }
861 xdr_error:
862         return nfserr_bad_xdr;
863 }
864 
865 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
866 {
867         __be32 *p;
868 
869         READ_BUF(4);
870         *x = be32_to_cpup(p++);
871         /* Note: unlinke access bits, deny bits may be zero. */
872         if (*x & ~NFS4_SHARE_DENY_BOTH)
873                 return nfserr_bad_xdr;
874         return nfs_ok;
875 xdr_error:
876         return nfserr_bad_xdr;
877 }
878 
879 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
880 {
881         __be32 *p;
882 
883         READ_BUF(4);
884         o->len = be32_to_cpup(p++);
885 
886         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
887                 return nfserr_bad_xdr;
888 
889         READ_BUF(o->len);
890         SAVEMEM(o->data, o->len);
891         return nfs_ok;
892 xdr_error:
893         return nfserr_bad_xdr;
894 }
895 
896 static __be32
897 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
898 {
899         DECODE_HEAD;
900         u32 dummy;
901 
902         memset(open->op_bmval, 0, sizeof(open->op_bmval));
903         open->op_iattr.ia_valid = 0;
904         open->op_openowner = NULL;
905 
906         open->op_xdr_error = 0;
907         /* seqid, share_access, share_deny, clientid, ownerlen */
908         READ_BUF(4);
909         open->op_seqid = be32_to_cpup(p++);
910         /* decode, yet ignore deleg_when until supported */
911         status = nfsd4_decode_share_access(argp, &open->op_share_access,
912                                            &open->op_deleg_want, &dummy);
913         if (status)
914                 goto xdr_error;
915         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
916         if (status)
917                 goto xdr_error;
918         READ_BUF(sizeof(clientid_t));
919         COPYMEM(&open->op_clientid, sizeof(clientid_t));
920         status = nfsd4_decode_opaque(argp, &open->op_owner);
921         if (status)
922                 goto xdr_error;
923         READ_BUF(4);
924         open->op_create = be32_to_cpup(p++);
925         switch (open->op_create) {
926         case NFS4_OPEN_NOCREATE:
927                 break;
928         case NFS4_OPEN_CREATE:
929                 READ_BUF(4);
930                 open->op_createmode = be32_to_cpup(p++);
931                 switch (open->op_createmode) {
932                 case NFS4_CREATE_UNCHECKED:
933                 case NFS4_CREATE_GUARDED:
934                         status = nfsd4_decode_fattr(argp, open->op_bmval,
935                                 &open->op_iattr, &open->op_acl, &open->op_label,
936                                 &open->op_umask);
937                         if (status)
938                                 goto out;
939                         break;
940                 case NFS4_CREATE_EXCLUSIVE:
941                         READ_BUF(NFS4_VERIFIER_SIZE);
942                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
943                         break;
944                 case NFS4_CREATE_EXCLUSIVE4_1:
945                         if (argp->minorversion < 1)
946                                 goto xdr_error;
947                         READ_BUF(NFS4_VERIFIER_SIZE);
948                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
949                         status = nfsd4_decode_fattr(argp, open->op_bmval,
950                                 &open->op_iattr, &open->op_acl, &open->op_label,
951                                 &open->op_umask);
952                         if (status)
953                                 goto out;
954                         break;
955                 default:
956                         goto xdr_error;
957                 }
958                 break;
959         default:
960                 goto xdr_error;
961         }
962 
963         /* open_claim */
964         READ_BUF(4);
965         open->op_claim_type = be32_to_cpup(p++);
966         switch (open->op_claim_type) {
967         case NFS4_OPEN_CLAIM_NULL:
968         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
969                 READ_BUF(4);
970                 open->op_fname.len = be32_to_cpup(p++);
971                 READ_BUF(open->op_fname.len);
972                 SAVEMEM(open->op_fname.data, open->op_fname.len);
973                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
974                         return status;
975                 break;
976         case NFS4_OPEN_CLAIM_PREVIOUS:
977                 READ_BUF(4);
978                 open->op_delegate_type = be32_to_cpup(p++);
979                 break;
980         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
981                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
982                 if (status)
983                         return status;
984                 READ_BUF(4);
985                 open->op_fname.len = be32_to_cpup(p++);
986                 READ_BUF(open->op_fname.len);
987                 SAVEMEM(open->op_fname.data, open->op_fname.len);
988                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
989                         return status;
990                 break;
991         case NFS4_OPEN_CLAIM_FH:
992         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
993                 if (argp->minorversion < 1)
994                         goto xdr_error;
995                 /* void */
996                 break;
997         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
998                 if (argp->minorversion < 1)
999                         goto xdr_error;
1000                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1001                 if (status)
1002                         return status;
1003                 break;
1004         default:
1005                 goto xdr_error;
1006         }
1007 
1008         DECODE_TAIL;
1009 }
1010 
1011 static __be32
1012 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1013 {
1014         DECODE_HEAD;
1015 
1016         if (argp->minorversion >= 1)
1017                 return nfserr_notsupp;
1018 
1019         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1020         if (status)
1021                 return status;
1022         READ_BUF(4);
1023         open_conf->oc_seqid = be32_to_cpup(p++);
1024 
1025         DECODE_TAIL;
1026 }
1027 
1028 static __be32
1029 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1030 {
1031         DECODE_HEAD;
1032                     
1033         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1034         if (status)
1035                 return status;
1036         READ_BUF(4);
1037         open_down->od_seqid = be32_to_cpup(p++);
1038         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1039                                            &open_down->od_deleg_want, NULL);
1040         if (status)
1041                 return status;
1042         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1043         if (status)
1044                 return status;
1045         DECODE_TAIL;
1046 }
1047 
1048 static __be32
1049 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1050 {
1051         DECODE_HEAD;
1052 
1053         READ_BUF(4);
1054         putfh->pf_fhlen = be32_to_cpup(p++);
1055         if (putfh->pf_fhlen > NFS4_FHSIZE)
1056                 goto xdr_error;
1057         READ_BUF(putfh->pf_fhlen);
1058         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1059 
1060         DECODE_TAIL;
1061 }
1062 
1063 static __be32
1064 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1065 {
1066         if (argp->minorversion == 0)
1067                 return nfs_ok;
1068         return nfserr_notsupp;
1069 }
1070 
1071 static __be32
1072 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1073 {
1074         DECODE_HEAD;
1075 
1076         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1077         if (status)
1078                 return status;
1079         READ_BUF(12);
1080         p = xdr_decode_hyper(p, &read->rd_offset);
1081         read->rd_length = be32_to_cpup(p++);
1082 
1083         DECODE_TAIL;
1084 }
1085 
1086 static __be32
1087 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1088 {
1089         DECODE_HEAD;
1090 
1091         READ_BUF(24);
1092         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1093         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1094         readdir->rd_dircount = be32_to_cpup(p++);
1095         readdir->rd_maxcount = be32_to_cpup(p++);
1096         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1097                 goto out;
1098 
1099         DECODE_TAIL;
1100 }
1101 
1102 static __be32
1103 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1104 {
1105         DECODE_HEAD;
1106 
1107         READ_BUF(4);
1108         remove->rm_namelen = be32_to_cpup(p++);
1109         READ_BUF(remove->rm_namelen);
1110         SAVEMEM(remove->rm_name, remove->rm_namelen);
1111         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1112                 return status;
1113 
1114         DECODE_TAIL;
1115 }
1116 
1117 static __be32
1118 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1119 {
1120         DECODE_HEAD;
1121 
1122         READ_BUF(4);
1123         rename->rn_snamelen = be32_to_cpup(p++);
1124         READ_BUF(rename->rn_snamelen);
1125         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1126         READ_BUF(4);
1127         rename->rn_tnamelen = be32_to_cpup(p++);
1128         READ_BUF(rename->rn_tnamelen);
1129         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1130         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1131                 return status;
1132         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1133                 return status;
1134 
1135         DECODE_TAIL;
1136 }
1137 
1138 static __be32
1139 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1140 {
1141         DECODE_HEAD;
1142 
1143         if (argp->minorversion >= 1)
1144                 return nfserr_notsupp;
1145 
1146         READ_BUF(sizeof(clientid_t));
1147         COPYMEM(clientid, sizeof(clientid_t));
1148 
1149         DECODE_TAIL;
1150 }
1151 
1152 static __be32
1153 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1154                      struct nfsd4_secinfo *secinfo)
1155 {
1156         DECODE_HEAD;
1157 
1158         READ_BUF(4);
1159         secinfo->si_namelen = be32_to_cpup(p++);
1160         READ_BUF(secinfo->si_namelen);
1161         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1162         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1163         if (status)
1164                 return status;
1165         DECODE_TAIL;
1166 }
1167 
1168 static __be32
1169 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1170                      struct nfsd4_secinfo_no_name *sin)
1171 {
1172         DECODE_HEAD;
1173 
1174         READ_BUF(4);
1175         sin->sin_style = be32_to_cpup(p++);
1176         DECODE_TAIL;
1177 }
1178 
1179 static __be32
1180 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1181 {
1182         __be32 status;
1183 
1184         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1185         if (status)
1186                 return status;
1187         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1188                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1189 }
1190 
1191 static __be32
1192 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1193 {
1194         DECODE_HEAD;
1195 
1196         if (argp->minorversion >= 1)
1197                 return nfserr_notsupp;
1198 
1199         READ_BUF(NFS4_VERIFIER_SIZE);
1200         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1201 
1202         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1203         if (status)
1204                 return nfserr_bad_xdr;
1205         READ_BUF(8);
1206         setclientid->se_callback_prog = be32_to_cpup(p++);
1207         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1208         READ_BUF(setclientid->se_callback_netid_len);
1209         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1210         READ_BUF(4);
1211         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1212 
1213         READ_BUF(setclientid->se_callback_addr_len);
1214         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1215         READ_BUF(4);
1216         setclientid->se_callback_ident = be32_to_cpup(p++);
1217 
1218         DECODE_TAIL;
1219 }
1220 
1221 static __be32
1222 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1223 {
1224         DECODE_HEAD;
1225 
1226         if (argp->minorversion >= 1)
1227                 return nfserr_notsupp;
1228 
1229         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1230         COPYMEM(&scd_c->sc_clientid, 8);
1231         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1232 
1233         DECODE_TAIL;
1234 }
1235 
1236 /* Also used for NVERIFY */
1237 static __be32
1238 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1239 {
1240         DECODE_HEAD;
1241 
1242         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1243                 goto out;
1244 
1245         /* For convenience's sake, we compare raw xdr'd attributes in
1246          * nfsd4_proc_verify */
1247 
1248         READ_BUF(4);
1249         verify->ve_attrlen = be32_to_cpup(p++);
1250         READ_BUF(verify->ve_attrlen);
1251         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1252 
1253         DECODE_TAIL;
1254 }
1255 
1256 static __be32
1257 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1258 {
1259         int avail;
1260         int len;
1261         DECODE_HEAD;
1262 
1263         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1264         if (status)
1265                 return status;
1266         READ_BUF(16);
1267         p = xdr_decode_hyper(p, &write->wr_offset);
1268         write->wr_stable_how = be32_to_cpup(p++);
1269         if (write->wr_stable_how > NFS_FILE_SYNC)
1270                 goto xdr_error;
1271         write->wr_buflen = be32_to_cpup(p++);
1272 
1273         /* Sorry .. no magic macros for this.. *
1274          * READ_BUF(write->wr_buflen);
1275          * SAVEMEM(write->wr_buf, write->wr_buflen);
1276          */
1277         avail = (char*)argp->end - (char*)argp->p;
1278         if (avail + argp->pagelen < write->wr_buflen) {
1279                 dprintk("NFSD: xdr error (%s:%d)\n",
1280                                 __FILE__, __LINE__);
1281                 goto xdr_error;
1282         }
1283         write->wr_head.iov_base = p;
1284         write->wr_head.iov_len = avail;
1285         write->wr_pagelist = argp->pagelist;
1286 
1287         len = XDR_QUADLEN(write->wr_buflen) << 2;
1288         if (len >= avail) {
1289                 int pages;
1290 
1291                 len -= avail;
1292 
1293                 pages = len >> PAGE_SHIFT;
1294                 argp->pagelist += pages;
1295                 argp->pagelen -= pages * PAGE_SIZE;
1296                 len -= pages * PAGE_SIZE;
1297 
1298                 next_decode_page(argp);
1299         }
1300         argp->p += XDR_QUADLEN(len);
1301 
1302         DECODE_TAIL;
1303 }
1304 
1305 static __be32
1306 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1307 {
1308         DECODE_HEAD;
1309 
1310         if (argp->minorversion >= 1)
1311                 return nfserr_notsupp;
1312 
1313         READ_BUF(12);
1314         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1315         rlockowner->rl_owner.len = be32_to_cpup(p++);
1316         READ_BUF(rlockowner->rl_owner.len);
1317         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1318 
1319         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1320                 return nfserr_inval;
1321         DECODE_TAIL;
1322 }
1323 
1324 static __be32
1325 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1326                          struct nfsd4_exchange_id *exid)
1327 {
1328         int dummy, tmp;
1329         DECODE_HEAD;
1330 
1331         READ_BUF(NFS4_VERIFIER_SIZE);
1332         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1333 
1334         status = nfsd4_decode_opaque(argp, &exid->clname);
1335         if (status)
1336                 return nfserr_bad_xdr;
1337 
1338         READ_BUF(4);
1339         exid->flags = be32_to_cpup(p++);
1340 
1341         /* Ignore state_protect4_a */
1342         READ_BUF(4);
1343         exid->spa_how = be32_to_cpup(p++);
1344         switch (exid->spa_how) {
1345         case SP4_NONE:
1346                 break;
1347         case SP4_MACH_CRED:
1348                 /* spo_must_enforce */
1349                 status = nfsd4_decode_bitmap(argp,
1350                                         exid->spo_must_enforce);
1351                 if (status)
1352                         goto out;
1353                 /* spo_must_allow */
1354                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1355                 if (status)
1356                         goto out;
1357                 break;
1358         case SP4_SSV:
1359                 /* ssp_ops */
1360                 READ_BUF(4);
1361                 dummy = be32_to_cpup(p++);
1362                 READ_BUF(dummy * 4);
1363                 p += dummy;
1364 
1365                 READ_BUF(4);
1366                 dummy = be32_to_cpup(p++);
1367                 READ_BUF(dummy * 4);
1368                 p += dummy;
1369 
1370                 /* ssp_hash_algs<> */
1371                 READ_BUF(4);
1372                 tmp = be32_to_cpup(p++);
1373                 while (tmp--) {
1374                         READ_BUF(4);
1375                         dummy = be32_to_cpup(p++);
1376                         READ_BUF(dummy);
1377                         p += XDR_QUADLEN(dummy);
1378                 }
1379 
1380                 /* ssp_encr_algs<> */
1381                 READ_BUF(4);
1382                 tmp = be32_to_cpup(p++);
1383                 while (tmp--) {
1384                         READ_BUF(4);
1385                         dummy = be32_to_cpup(p++);
1386                         READ_BUF(dummy);
1387                         p += XDR_QUADLEN(dummy);
1388                 }
1389 
1390                 /* ssp_window and ssp_num_gss_handles */
1391                 READ_BUF(8);
1392                 dummy = be32_to_cpup(p++);
1393                 dummy = be32_to_cpup(p++);
1394                 break;
1395         default:
1396                 goto xdr_error;
1397         }
1398 
1399         /* Ignore Implementation ID */
1400         READ_BUF(4);    /* nfs_impl_id4 array length */
1401         dummy = be32_to_cpup(p++);
1402 
1403         if (dummy > 1)
1404                 goto xdr_error;
1405 
1406         if (dummy == 1) {
1407                 /* nii_domain */
1408                 READ_BUF(4);
1409                 dummy = be32_to_cpup(p++);
1410                 READ_BUF(dummy);
1411                 p += XDR_QUADLEN(dummy);
1412 
1413                 /* nii_name */
1414                 READ_BUF(4);
1415                 dummy = be32_to_cpup(p++);
1416                 READ_BUF(dummy);
1417                 p += XDR_QUADLEN(dummy);
1418 
1419                 /* nii_date */
1420                 READ_BUF(12);
1421                 p += 3;
1422         }
1423         DECODE_TAIL;
1424 }
1425 
1426 static __be32
1427 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1428                             struct nfsd4_create_session *sess)
1429 {
1430         DECODE_HEAD;
1431         u32 dummy;
1432 
1433         READ_BUF(16);
1434         COPYMEM(&sess->clientid, 8);
1435         sess->seqid = be32_to_cpup(p++);
1436         sess->flags = be32_to_cpup(p++);
1437 
1438         /* Fore channel attrs */
1439         READ_BUF(28);
1440         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1441         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1442         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1443         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1444         sess->fore_channel.maxops = be32_to_cpup(p++);
1445         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1446         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1447         if (sess->fore_channel.nr_rdma_attrs == 1) {
1448                 READ_BUF(4);
1449                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1450         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1451                 dprintk("Too many fore channel attr bitmaps!\n");
1452                 goto xdr_error;
1453         }
1454 
1455         /* Back channel attrs */
1456         READ_BUF(28);
1457         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1458         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1459         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1460         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1461         sess->back_channel.maxops = be32_to_cpup(p++);
1462         sess->back_channel.maxreqs = be32_to_cpup(p++);
1463         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1464         if (sess->back_channel.nr_rdma_attrs == 1) {
1465                 READ_BUF(4);
1466                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1467         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1468                 dprintk("Too many back channel attr bitmaps!\n");
1469                 goto xdr_error;
1470         }
1471 
1472         READ_BUF(4);
1473         sess->callback_prog = be32_to_cpup(p++);
1474         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1475         DECODE_TAIL;
1476 }
1477 
1478 static __be32
1479 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1480                              struct nfsd4_destroy_session *destroy_session)
1481 {
1482         DECODE_HEAD;
1483         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1484         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1485 
1486         DECODE_TAIL;
1487 }
1488 
1489 static __be32
1490 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1491                           struct nfsd4_free_stateid *free_stateid)
1492 {
1493         DECODE_HEAD;
1494 
1495         READ_BUF(sizeof(stateid_t));
1496         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1497         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1498 
1499         DECODE_TAIL;
1500 }
1501 
1502 static __be32
1503 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1504                       struct nfsd4_sequence *seq)
1505 {
1506         DECODE_HEAD;
1507 
1508         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1509         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1510         seq->seqid = be32_to_cpup(p++);
1511         seq->slotid = be32_to_cpup(p++);
1512         seq->maxslots = be32_to_cpup(p++);
1513         seq->cachethis = be32_to_cpup(p++);
1514 
1515         DECODE_TAIL;
1516 }
1517 
1518 static __be32
1519 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1520 {
1521         int i;
1522         __be32 *p, status;
1523         struct nfsd4_test_stateid_id *stateid;
1524 
1525         READ_BUF(4);
1526         test_stateid->ts_num_ids = ntohl(*p++);
1527 
1528         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1529 
1530         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1531                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1532                 if (!stateid) {
1533                         status = nfserrno(-ENOMEM);
1534                         goto out;
1535                 }
1536 
1537                 INIT_LIST_HEAD(&stateid->ts_id_list);
1538                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1539 
1540                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1541                 if (status)
1542                         goto out;
1543         }
1544 
1545         status = 0;
1546 out:
1547         return status;
1548 xdr_error:
1549         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1550         status = nfserr_bad_xdr;
1551         goto out;
1552 }
1553 
1554 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1555 {
1556         DECODE_HEAD;
1557 
1558         READ_BUF(8);
1559         COPYMEM(&dc->clientid, 8);
1560 
1561         DECODE_TAIL;
1562 }
1563 
1564 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1565 {
1566         DECODE_HEAD;
1567 
1568         READ_BUF(4);
1569         rc->rca_one_fs = be32_to_cpup(p++);
1570 
1571         DECODE_TAIL;
1572 }
1573 
1574 #ifdef CONFIG_NFSD_PNFS
1575 static __be32
1576 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1577                 struct nfsd4_getdeviceinfo *gdev)
1578 {
1579         DECODE_HEAD;
1580         u32 num, i;
1581 
1582         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1583         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1584         gdev->gd_layout_type = be32_to_cpup(p++);
1585         gdev->gd_maxcount = be32_to_cpup(p++);
1586         num = be32_to_cpup(p++);
1587         if (num) {
1588                 if (num > 1000)
1589                         goto xdr_error;
1590                 READ_BUF(4 * num);
1591                 gdev->gd_notify_types = be32_to_cpup(p++);
1592                 for (i = 1; i < num; i++) {
1593                         if (be32_to_cpup(p++)) {
1594                                 status = nfserr_inval;
1595                                 goto out;
1596                         }
1597                 }
1598         }
1599         DECODE_TAIL;
1600 }
1601 
1602 static __be32
1603 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1604                 struct nfsd4_layoutget *lgp)
1605 {
1606         DECODE_HEAD;
1607 
1608         READ_BUF(36);
1609         lgp->lg_signal = be32_to_cpup(p++);
1610         lgp->lg_layout_type = be32_to_cpup(p++);
1611         lgp->lg_seg.iomode = be32_to_cpup(p++);
1612         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1613         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1614         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1615 
1616         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1617         if (status)
1618                 return status;
1619 
1620         READ_BUF(4);
1621         lgp->lg_maxcount = be32_to_cpup(p++);
1622 
1623         DECODE_TAIL;
1624 }
1625 
1626 static __be32
1627 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1628                 struct nfsd4_layoutcommit *lcp)
1629 {
1630         DECODE_HEAD;
1631         u32 timechange;
1632 
1633         READ_BUF(20);
1634         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1635         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1636         lcp->lc_reclaim = be32_to_cpup(p++);
1637 
1638         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1639         if (status)
1640                 return status;
1641 
1642         READ_BUF(4);
1643         lcp->lc_newoffset = be32_to_cpup(p++);
1644         if (lcp->lc_newoffset) {
1645                 READ_BUF(8);
1646                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1647         } else
1648                 lcp->lc_last_wr = 0;
1649         READ_BUF(4);
1650         timechange = be32_to_cpup(p++);
1651         if (timechange) {
1652                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1653                 if (status)
1654                         return status;
1655         } else {
1656                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1657         }
1658         READ_BUF(8);
1659         lcp->lc_layout_type = be32_to_cpup(p++);
1660 
1661         /*
1662          * Save the layout update in XDR format and let the layout driver deal
1663          * with it later.
1664          */
1665         lcp->lc_up_len = be32_to_cpup(p++);
1666         if (lcp->lc_up_len > 0) {
1667                 READ_BUF(lcp->lc_up_len);
1668                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1669         }
1670 
1671         DECODE_TAIL;
1672 }
1673 
1674 static __be32
1675 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1676                 struct nfsd4_layoutreturn *lrp)
1677 {
1678         DECODE_HEAD;
1679 
1680         READ_BUF(16);
1681         lrp->lr_reclaim = be32_to_cpup(p++);
1682         lrp->lr_layout_type = be32_to_cpup(p++);
1683         lrp->lr_seg.iomode = be32_to_cpup(p++);
1684         lrp->lr_return_type = be32_to_cpup(p++);
1685         if (lrp->lr_return_type == RETURN_FILE) {
1686                 READ_BUF(16);
1687                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1688                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1689 
1690                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1691                 if (status)
1692                         return status;
1693 
1694                 READ_BUF(4);
1695                 lrp->lrf_body_len = be32_to_cpup(p++);
1696                 if (lrp->lrf_body_len > 0) {
1697                         READ_BUF(lrp->lrf_body_len);
1698                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1699                 }
1700         } else {
1701                 lrp->lr_seg.offset = 0;
1702                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1703         }
1704 
1705         DECODE_TAIL;
1706 }
1707 #endif /* CONFIG_NFSD_PNFS */
1708 
1709 static __be32
1710 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1711                        struct nfsd4_fallocate *fallocate)
1712 {
1713         DECODE_HEAD;
1714 
1715         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1716         if (status)
1717                 return status;
1718 
1719         READ_BUF(16);
1720         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1721         xdr_decode_hyper(p, &fallocate->falloc_length);
1722 
1723         DECODE_TAIL;
1724 }
1725 
1726 static __be32
1727 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1728 {
1729         DECODE_HEAD;
1730 
1731         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1732         if (status)
1733                 return status;
1734         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1735         if (status)
1736                 return status;
1737 
1738         READ_BUF(8 + 8 + 8);
1739         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1740         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1741         p = xdr_decode_hyper(p, &clone->cl_count);
1742         DECODE_TAIL;
1743 }
1744 
1745 static __be32
1746 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1747 {
1748         DECODE_HEAD;
1749         unsigned int tmp;
1750 
1751         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1752         if (status)
1753                 return status;
1754         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1755         if (status)
1756                 return status;
1757 
1758         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1759         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1760         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1761         p = xdr_decode_hyper(p, &copy->cp_count);
1762         p++; /* ca_consecutive: we always do consecutive copies */
1763         copy->cp_synchronous = be32_to_cpup(p++);
1764         tmp = be32_to_cpup(p); /* Source server list not supported */
1765 
1766         DECODE_TAIL;
1767 }
1768 
1769 static __be32
1770 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1771 {
1772         DECODE_HEAD;
1773 
1774         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1775         if (status)
1776                 return status;
1777 
1778         READ_BUF(8 + 4);
1779         p = xdr_decode_hyper(p, &seek->seek_offset);
1780         seek->seek_whence = be32_to_cpup(p);
1781 
1782         DECODE_TAIL;
1783 }
1784 
1785 static __be32
1786 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1787 {
1788         return nfs_ok;
1789 }
1790 
1791 static __be32
1792 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1793 {
1794         return nfserr_notsupp;
1795 }
1796 
1797 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1798 
1799 static const nfsd4_dec nfsd4_dec_ops[] = {
1800         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1801         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1802         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1803         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1804         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1805         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1806         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1807         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1808         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1809         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1810         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1811         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1812         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1813         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1814         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1815         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1816         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1817         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1818         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1819         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1820         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1821         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1822         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1823         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1824         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1825         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1826         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1827         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1828         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1829         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1830         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1831         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1832         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1833         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1834         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1835         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1836         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1837 
1838         /* new operations for NFSv4.1 */
1839         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1840         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1841         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1842         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1843         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1844         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1845         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1846 #ifdef CONFIG_NFSD_PNFS
1847         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1848         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1849         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1850         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1851         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1852 #else
1853         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1854         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1855         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1856         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1858 #endif
1859         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1860         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1861         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1863         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1864         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1865         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1866 
1867         /* new operations for NFSv4.2 */
1868         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1869         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1870         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1871         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1872         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1873         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1874         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1875         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_notsupp,
1876         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_notsupp,
1877         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1878         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1879         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1880         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1881 };
1882 
1883 static inline bool
1884 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1885 {
1886         if (op->opnum < FIRST_NFS4_OP)
1887                 return false;
1888         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1889                 return false;
1890         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1891                 return false;
1892         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1893                 return false;
1894         return true;
1895 }
1896 
1897 static __be32
1898 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1899 {
1900         DECODE_HEAD;
1901         struct nfsd4_op *op;
1902         bool cachethis = false;
1903         int auth_slack= argp->rqstp->rq_auth_slack;
1904         int max_reply = auth_slack + 8; /* opcnt, status */
1905         int readcount = 0;
1906         int readbytes = 0;
1907         int i;
1908 
1909         READ_BUF(4);
1910         argp->taglen = be32_to_cpup(p++);
1911         READ_BUF(argp->taglen);
1912         SAVEMEM(argp->tag, argp->taglen);
1913         READ_BUF(8);
1914         argp->minorversion = be32_to_cpup(p++);
1915         argp->opcnt = be32_to_cpup(p++);
1916         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1917 
1918         if (argp->taglen > NFSD4_MAX_TAGLEN)
1919                 goto xdr_error;
1920         /*
1921          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1922          * here, so we return success at the xdr level so that
1923          * nfsd4_proc can handle this is an NFS-level error.
1924          */
1925         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1926                 return 0;
1927 
1928         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1929                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1930                 if (!argp->ops) {
1931                         argp->ops = argp->iops;
1932                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1933                         goto xdr_error;
1934                 }
1935         }
1936 
1937         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1938                 argp->opcnt = 0;
1939 
1940         for (i = 0; i < argp->opcnt; i++) {
1941                 op = &argp->ops[i];
1942                 op->replay = NULL;
1943 
1944                 READ_BUF(4);
1945                 op->opnum = be32_to_cpup(p++);
1946 
1947                 if (nfsd4_opnum_in_range(argp, op))
1948                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1949                 else {
1950                         op->opnum = OP_ILLEGAL;
1951                         op->status = nfserr_op_illegal;
1952                 }
1953                 op->opdesc = OPDESC(op);
1954                 /*
1955                  * We'll try to cache the result in the DRC if any one
1956                  * op in the compound wants to be cached:
1957                  */
1958                 cachethis |= nfsd4_cache_this_op(op);
1959 
1960                 if (op->opnum == OP_READ) {
1961                         readcount++;
1962                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1963                 } else
1964                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1965                 /*
1966                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1967                  * (Special case because it will just skip encoding this
1968                  * if it runs out of xdr buffer space, and it is the only
1969                  * operation that behaves this way.)
1970                  */
1971                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1972                         max_reply += NFS4_OPAQUE_LIMIT;
1973 
1974                 if (op->status) {
1975                         argp->opcnt = i+1;
1976                         break;
1977                 }
1978         }
1979         /* Sessions make the DRC unnecessary: */
1980         if (argp->minorversion)
1981                 cachethis = false;
1982         svc_reserve(argp->rqstp, max_reply + readbytes);
1983         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1984 
1985         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1986                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1987 
1988         DECODE_TAIL;
1989 }
1990 
1991 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1992                              struct svc_export *exp)
1993 {
1994         if (exp->ex_flags & NFSEXP_V4ROOT) {
1995                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1996                 *p++ = 0;
1997         } else if (IS_I_VERSION(inode)) {
1998                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
1999         } else {
2000                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2001                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2002         }
2003         return p;
2004 }
2005 
2006 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2007 {
2008         *p++ = cpu_to_be32(c->atomic);
2009         if (c->change_supported) {
2010                 p = xdr_encode_hyper(p, c->before_change);
2011                 p = xdr_encode_hyper(p, c->after_change);
2012         } else {
2013                 *p++ = cpu_to_be32(c->before_ctime_sec);
2014                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2015                 *p++ = cpu_to_be32(c->after_ctime_sec);
2016                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2017         }
2018         return p;
2019 }
2020 
2021 /* Encode as an array of strings the string given with components
2022  * separated @sep, escaped with esc_enter and esc_exit.
2023  */
2024 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2025                                           char *components, char esc_enter,
2026                                           char esc_exit)
2027 {
2028         __be32 *p;
2029         __be32 pathlen;
2030         int pathlen_offset;
2031         int strlen, count=0;
2032         char *str, *end, *next;
2033 
2034         dprintk("nfsd4_encode_components(%s)\n", components);
2035 
2036         pathlen_offset = xdr->buf->len;
2037         p = xdr_reserve_space(xdr, 4);
2038         if (!p)
2039                 return nfserr_resource;
2040         p++; /* We will fill this in with @count later */
2041 
2042         end = str = components;
2043         while (*end) {
2044                 bool found_esc = false;
2045 
2046                 /* try to parse as esc_start, ..., esc_end, sep */
2047                 if (*str == esc_enter) {
2048                         for (; *end && (*end != esc_exit); end++)
2049                                 /* find esc_exit or end of string */;
2050                         next = end + 1;
2051                         if (*end && (!*next || *next == sep)) {
2052                                 str++;
2053                                 found_esc = true;
2054                         }
2055                 }
2056 
2057                 if (!found_esc)
2058                         for (; *end && (*end != sep); end++)
2059                                 /* find sep or end of string */;
2060 
2061                 strlen = end - str;
2062                 if (strlen) {
2063                         p = xdr_reserve_space(xdr, strlen + 4);
2064                         if (!p)
2065                                 return nfserr_resource;
2066                         p = xdr_encode_opaque(p, str, strlen);
2067                         count++;
2068                 }
2069                 else
2070                         end++;
2071                 if (found_esc)
2072                         end = next;
2073 
2074                 str = end;
2075         }
2076         pathlen = htonl(count);
2077         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2078         return 0;
2079 }
2080 
2081 /* Encode as an array of strings the string given with components
2082  * separated @sep.
2083  */
2084 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2085                                       char *components)
2086 {
2087         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2088 }
2089 
2090 /*
2091  * encode a location element of a fs_locations structure
2092  */
2093 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2094                                         struct nfsd4_fs_location *location)
2095 {
2096         __be32 status;
2097 
2098         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2099                                                 '[', ']');
2100         if (status)
2101                 return status;
2102         status = nfsd4_encode_components(xdr, '/', location->path);
2103         if (status)
2104                 return status;
2105         return 0;
2106 }
2107 
2108 /*
2109  * Encode a path in RFC3530 'pathname4' format
2110  */
2111 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2112                                 const struct path *root,
2113                                 const struct path *path)
2114 {
2115         struct path cur = *path;
2116         __be32 *p;
2117         struct dentry **components = NULL;
2118         unsigned int ncomponents = 0;
2119         __be32 err = nfserr_jukebox;
2120 
2121         dprintk("nfsd4_encode_components(");
2122 
2123         path_get(&cur);
2124         /* First walk the path up to the nfsd root, and store the
2125          * dentries/path components in an array.
2126          */
2127         for (;;) {
2128                 if (path_equal(&cur, root))
2129                         break;
2130                 if (cur.dentry == cur.mnt->mnt_root) {
2131                         if (follow_up(&cur))
2132                                 continue;
2133                         goto out_free;
2134                 }
2135                 if ((ncomponents & 15) == 0) {
2136                         struct dentry **new;
2137                         new = krealloc(components,
2138                                         sizeof(*new) * (ncomponents + 16),
2139                                         GFP_KERNEL);
2140                         if (!new)
2141                                 goto out_free;
2142                         components = new;
2143                 }
2144                 components[ncomponents++] = cur.dentry;
2145                 cur.dentry = dget_parent(cur.dentry);
2146         }
2147         err = nfserr_resource;
2148         p = xdr_reserve_space(xdr, 4);
2149         if (!p)
2150                 goto out_free;
2151         *p++ = cpu_to_be32(ncomponents);
2152 
2153         while (ncomponents) {
2154                 struct dentry *dentry = components[ncomponents - 1];
2155                 unsigned int len;
2156 
2157                 spin_lock(&dentry->d_lock);
2158                 len = dentry->d_name.len;
2159                 p = xdr_reserve_space(xdr, len + 4);
2160                 if (!p) {
2161                         spin_unlock(&dentry->d_lock);
2162                         goto out_free;
2163                 }
2164                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2165                 dprintk("/%pd", dentry);
2166                 spin_unlock(&dentry->d_lock);
2167                 dput(dentry);
2168                 ncomponents--;
2169         }
2170 
2171         err = 0;
2172 out_free:
2173         dprintk(")\n");
2174         while (ncomponents)
2175                 dput(components[--ncomponents]);
2176         kfree(components);
2177         path_put(&cur);
2178         return err;
2179 }
2180 
2181 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2182                         struct svc_rqst *rqstp, const struct path *path)
2183 {
2184         struct svc_export *exp_ps;
2185         __be32 res;
2186 
2187         exp_ps = rqst_find_fsidzero_export(rqstp);
2188         if (IS_ERR(exp_ps))
2189                 return nfserrno(PTR_ERR(exp_ps));
2190         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2191         exp_put(exp_ps);
2192         return res;
2193 }
2194 
2195 /*
2196  *  encode a fs_locations structure
2197  */
2198 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2199                         struct svc_rqst *rqstp, struct svc_export *exp)
2200 {
2201         __be32 status;
2202         int i;
2203         __be32 *p;
2204         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2205 
2206         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2207         if (status)
2208                 return status;
2209         p = xdr_reserve_space(xdr, 4);
2210         if (!p)
2211                 return nfserr_resource;
2212         *p++ = cpu_to_be32(fslocs->locations_count);
2213         for (i=0; i<fslocs->locations_count; i++) {
2214                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2215                 if (status)
2216                         return status;
2217         }
2218         return 0;
2219 }
2220 
2221 static u32 nfs4_file_type(umode_t mode)
2222 {
2223         switch (mode & S_IFMT) {
2224         case S_IFIFO:   return NF4FIFO;
2225         case S_IFCHR:   return NF4CHR;
2226         case S_IFDIR:   return NF4DIR;
2227         case S_IFBLK:   return NF4BLK;
2228         case S_IFLNK:   return NF4LNK;
2229         case S_IFREG:   return NF4REG;
2230         case S_IFSOCK:  return NF4SOCK;
2231         default:        return NF4BAD;
2232         };
2233 }
2234 
2235 static inline __be32
2236 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2237                      struct nfs4_ace *ace)
2238 {
2239         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2240                 return nfs4_acl_write_who(xdr, ace->whotype);
2241         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2242                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2243         else
2244                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2245 }
2246 
2247 static inline __be32
2248 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2249 {
2250         __be32          *p;
2251         unsigned long   i = hweight_long(layout_types);
2252 
2253         p = xdr_reserve_space(xdr, 4 + 4 * i);
2254         if (!p)
2255                 return nfserr_resource;
2256 
2257         *p++ = cpu_to_be32(i);
2258 
2259         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2260                 if (layout_types & (1 << i))
2261                         *p++ = cpu_to_be32(i);
2262 
2263         return 0;
2264 }
2265 
2266 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2267                               FATTR4_WORD0_RDATTR_ERROR)
2268 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2269 #define WORD2_ABSENT_FS_ATTRS 0
2270 
2271 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2272 static inline __be32
2273 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2274                             void *context, int len)
2275 {
2276         __be32 *p;
2277 
2278         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2279         if (!p)
2280                 return nfserr_resource;
2281 
2282         /*
2283          * For now we use a 0 here to indicate the null translation; in
2284          * the future we may place a call to translation code here.
2285          */
2286         *p++ = cpu_to_be32(0); /* lfs */
2287         *p++ = cpu_to_be32(0); /* pi */
2288         p = xdr_encode_opaque(p, context, len);
2289         return 0;
2290 }
2291 #else
2292 static inline __be32
2293 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2294                             void *context, int len)
2295 { return 0; }
2296 #endif
2297 
2298 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2299 {
2300         /* As per referral draft:  */
2301         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2302             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2303                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2304                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2305                         *rdattr_err = NFSERR_MOVED;
2306                 else
2307                         return nfserr_moved;
2308         }
2309         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2310         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2311         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2312         return 0;
2313 }
2314 
2315 
2316 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2317 {
2318         struct path path = exp->ex_path;
2319         int err;
2320 
2321         path_get(&path);
2322         while (follow_up(&path)) {
2323                 if (path.dentry != path.mnt->mnt_root)
2324                         break;
2325         }
2326         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2327         path_put(&path);
2328         return err;
2329 }
2330 
2331 static __be32
2332 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2333 {
2334         __be32 *p;
2335 
2336         if (bmval2) {
2337                 p = xdr_reserve_space(xdr, 16);
2338                 if (!p)
2339                         goto out_resource;
2340                 *p++ = cpu_to_be32(3);
2341                 *p++ = cpu_to_be32(bmval0);
2342                 *p++ = cpu_to_be32(bmval1);
2343                 *p++ = cpu_to_be32(bmval2);
2344         } else if (bmval1) {
2345                 p = xdr_reserve_space(xdr, 12);
2346                 if (!p)
2347                         goto out_resource;
2348                 *p++ = cpu_to_be32(2);
2349                 *p++ = cpu_to_be32(bmval0);
2350                 *p++ = cpu_to_be32(bmval1);
2351         } else {
2352                 p = xdr_reserve_space(xdr, 8);
2353                 if (!p)
2354                         goto out_resource;
2355                 *p++ = cpu_to_be32(1);
2356                 *p++ = cpu_to_be32(bmval0);
2357         }
2358 
2359         return 0;
2360 out_resource:
2361         return nfserr_resource;
2362 }
2363 
2364 /*
2365  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2366  * ourselves.
2367  */
2368 static __be32
2369 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2370                 struct svc_export *exp,
2371                 struct dentry *dentry, u32 *bmval,
2372                 struct svc_rqst *rqstp, int ignore_crossmnt)
2373 {
2374         u32 bmval0 = bmval[0];
2375         u32 bmval1 = bmval[1];
2376         u32 bmval2 = bmval[2];
2377         struct kstat stat;
2378         struct svc_fh *tempfh = NULL;
2379         struct kstatfs statfs;
2380         __be32 *p;
2381         int starting_len = xdr->buf->len;
2382         int attrlen_offset;
2383         __be32 attrlen;
2384         u32 dummy;
2385         u64 dummy64;
2386         u32 rdattr_err = 0;
2387         __be32 status;
2388         int err;
2389         struct nfs4_acl *acl = NULL;
2390         void *context = NULL;
2391         int contextlen;
2392         bool contextsupport = false;
2393         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2394         u32 minorversion = resp->cstate.minorversion;
2395         struct path path = {
2396                 .mnt    = exp->ex_path.mnt,
2397                 .dentry = dentry,
2398         };
2399         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2400 
2401         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2402         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2403 
2404         if (exp->ex_fslocs.migrated) {
2405                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2406                 if (status)
2407                         goto out;
2408         }
2409 
2410         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2411         if (err)
2412                 goto out_nfserr;
2413         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2414                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2415             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2416                        FATTR4_WORD1_SPACE_TOTAL))) {
2417                 err = vfs_statfs(&path, &statfs);
2418                 if (err)
2419                         goto out_nfserr;
2420         }
2421         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2422                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2423                 status = nfserr_jukebox;
2424                 if (!tempfh)
2425                         goto out;
2426                 fh_init(tempfh, NFS4_FHSIZE);
2427                 status = fh_compose(tempfh, exp, dentry, NULL);
2428                 if (status)
2429                         goto out;
2430                 fhp = tempfh;
2431         }
2432         if (bmval0 & FATTR4_WORD0_ACL) {
2433                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2434                 if (err == -EOPNOTSUPP)
2435                         bmval0 &= ~FATTR4_WORD0_ACL;
2436                 else if (err == -EINVAL) {
2437                         status = nfserr_attrnotsupp;
2438                         goto out;
2439                 } else if (err != 0)
2440                         goto out_nfserr;
2441         }
2442 
2443 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2444         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2445              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2446                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2447                         err = security_inode_getsecctx(d_inode(dentry),
2448                                                 &context, &contextlen);
2449                 else
2450                         err = -EOPNOTSUPP;
2451                 contextsupport = (err == 0);
2452                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2453                         if (err == -EOPNOTSUPP)
2454                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2455                         else if (err)
2456                                 goto out_nfserr;
2457                 }
2458         }
2459 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2460 
2461         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2462         if (status)
2463                 goto out;
2464 
2465         attrlen_offset = xdr->buf->len;
2466         p = xdr_reserve_space(xdr, 4);
2467         if (!p)
2468                 goto out_resource;
2469         p++;                /* to be backfilled later */
2470 
2471         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2472                 u32 supp[3];
2473 
2474                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2475 
2476                 if (!IS_POSIXACL(dentry->d_inode))
2477                         supp[0] &= ~FATTR4_WORD0_ACL;
2478                 if (!contextsupport)
2479                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2480                 if (!supp[2]) {
2481                         p = xdr_reserve_space(xdr, 12);
2482                         if (!p)
2483                                 goto out_resource;
2484                         *p++ = cpu_to_be32(2);
2485                         *p++ = cpu_to_be32(supp[0]);
2486                         *p++ = cpu_to_be32(supp[1]);
2487                 } else {
2488                         p = xdr_reserve_space(xdr, 16);
2489                         if (!p)
2490                                 goto out_resource;
2491                         *p++ = cpu_to_be32(3);
2492                         *p++ = cpu_to_be32(supp[0]);
2493                         *p++ = cpu_to_be32(supp[1]);
2494                         *p++ = cpu_to_be32(supp[2]);
2495                 }
2496         }
2497         if (bmval0 & FATTR4_WORD0_TYPE) {
2498                 p = xdr_reserve_space(xdr, 4);
2499                 if (!p)
2500                         goto out_resource;
2501                 dummy = nfs4_file_type(stat.mode);
2502                 if (dummy == NF4BAD) {
2503                         status = nfserr_serverfault;
2504                         goto out;
2505                 }
2506                 *p++ = cpu_to_be32(dummy);
2507         }
2508         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2509                 p = xdr_reserve_space(xdr, 4);
2510                 if (!p)
2511                         goto out_resource;
2512                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2513                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2514                 else
2515                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2516                                                 NFS4_FH_VOL_RENAME);
2517         }
2518         if (bmval0 & FATTR4_WORD0_CHANGE) {
2519                 p = xdr_reserve_space(xdr, 8);
2520                 if (!p)
2521                         goto out_resource;
2522                 p = encode_change(p, &stat, d_inode(dentry), exp);
2523         }
2524         if (bmval0 & FATTR4_WORD0_SIZE) {
2525                 p = xdr_reserve_space(xdr, 8);
2526                 if (!p)
2527                         goto out_resource;
2528                 p = xdr_encode_hyper(p, stat.size);
2529         }
2530         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2531                 p = xdr_reserve_space(xdr, 4);
2532                 if (!p)
2533                         goto out_resource;
2534                 *p++ = cpu_to_be32(1);
2535         }
2536         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2537                 p = xdr_reserve_space(xdr, 4);
2538                 if (!p)
2539                         goto out_resource;
2540                 *p++ = cpu_to_be32(1);
2541         }
2542         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2543                 p = xdr_reserve_space(xdr, 4);
2544                 if (!p)
2545                         goto out_resource;
2546                 *p++ = cpu_to_be32(0);
2547         }
2548         if (bmval0 & FATTR4_WORD0_FSID) {
2549                 p = xdr_reserve_space(xdr, 16);
2550                 if (!p)
2551                         goto out_resource;
2552                 if (exp->ex_fslocs.migrated) {
2553                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2554                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2555                 } else switch(fsid_source(fhp)) {
2556                 case FSIDSOURCE_FSID:
2557                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2558                         p = xdr_encode_hyper(p, (u64)0);
2559                         break;
2560                 case FSIDSOURCE_DEV:
2561                         *p++ = cpu_to_be32(0);
2562                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2563                         *p++ = cpu_to_be32(0);
2564                         *p++ = cpu_to_be32(MINOR(stat.dev));
2565                         break;
2566                 case FSIDSOURCE_UUID:
2567                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2568                                                                 EX_UUID_LEN);
2569                         break;
2570                 }
2571         }
2572         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2573                 p = xdr_reserve_space(xdr, 4);
2574                 if (!p)
2575                         goto out_resource;
2576                 *p++ = cpu_to_be32(0);
2577         }
2578         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2579                 p = xdr_reserve_space(xdr, 4);
2580                 if (!p)
2581                         goto out_resource;
2582                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2583         }
2584         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2585                 p = xdr_reserve_space(xdr, 4);
2586                 if (!p)
2587                         goto out_resource;
2588                 *p++ = cpu_to_be32(rdattr_err);
2589         }
2590         if (bmval0 & FATTR4_WORD0_ACL) {
2591                 struct nfs4_ace *ace;
2592 
2593                 if (acl == NULL) {
2594                         p = xdr_reserve_space(xdr, 4);
2595                         if (!p)
2596                                 goto out_resource;
2597 
2598                         *p++ = cpu_to_be32(0);
2599                         goto out_acl;
2600                 }
2601                 p = xdr_reserve_space(xdr, 4);
2602                 if (!p)
2603                         goto out_resource;
2604                 *p++ = cpu_to_be32(acl->naces);
2605 
2606                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2607                         p = xdr_reserve_space(xdr, 4*3);
2608                         if (!p)
2609                                 goto out_resource;
2610                         *p++ = cpu_to_be32(ace->type);
2611                         *p++ = cpu_to_be32(ace->flag);
2612                         *p++ = cpu_to_be32(ace->access_mask &
2613                                                         NFS4_ACE_MASK_ALL);
2614                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2615                         if (status)
2616                                 goto out;
2617                 }
2618         }
2619 out_acl:
2620         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2621                 p = xdr_reserve_space(xdr, 4);
2622                 if (!p)
2623                         goto out_resource;
2624                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2625                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2626         }
2627         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2628                 p = xdr_reserve_space(xdr, 4);
2629                 if (!p)
2630                         goto out_resource;
2631                 *p++ = cpu_to_be32(1);
2632         }
2633         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2634                 p = xdr_reserve_space(xdr, 4);
2635                 if (!p)
2636                         goto out_resource;
2637                 *p++ = cpu_to_be32(0);
2638         }
2639         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2640                 p = xdr_reserve_space(xdr, 4);
2641                 if (!p)
2642                         goto out_resource;
2643                 *p++ = cpu_to_be32(1);
2644         }
2645         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2646                 p = xdr_reserve_space(xdr, 4);
2647                 if (!p)
2648                         goto out_resource;
2649                 *p++ = cpu_to_be32(1);
2650         }
2651         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2652                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2653                 if (!p)
2654                         goto out_resource;
2655                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2656                                         fhp->fh_handle.fh_size);
2657         }
2658         if (bmval0 & FATTR4_WORD0_FILEID) {
2659                 p = xdr_reserve_space(xdr, 8);
2660                 if (!p)
2661                         goto out_resource;
2662                 p = xdr_encode_hyper(p, stat.ino);
2663         }
2664         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2665                 p = xdr_reserve_space(xdr, 8);
2666                 if (!p)
2667                         goto out_resource;
2668                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2669         }
2670         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2671                 p = xdr_reserve_space(xdr, 8);
2672                 if (!p)
2673                         goto out_resource;
2674                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2675         }
2676         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2677                 p = xdr_reserve_space(xdr, 8);
2678                 if (!p)
2679                         goto out_resource;
2680                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2681         }
2682         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2683                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2684                 if (status)
2685                         goto out;
2686         }
2687         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2688                 p = xdr_reserve_space(xdr, 4);
2689                 if (!p)
2690                         goto out_resource;
2691                 *p++ = cpu_to_be32(1);
2692         }
2693         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2694                 p = xdr_reserve_space(xdr, 8);
2695                 if (!p)
2696                         goto out_resource;
2697                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2698         }
2699         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2700                 p = xdr_reserve_space(xdr, 4);
2701                 if (!p)
2702                         goto out_resource;
2703                 *p++ = cpu_to_be32(255);
2704         }
2705         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2706                 p = xdr_reserve_space(xdr, 4);
2707                 if (!p)
2708                         goto out_resource;
2709                 *p++ = cpu_to_be32(statfs.f_namelen);
2710         }
2711         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2712                 p = xdr_reserve_space(xdr, 8);
2713                 if (!p)
2714                         goto out_resource;
2715                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2716         }
2717         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2718                 p = xdr_reserve_space(xdr, 8);
2719                 if (!p)
2720                         goto out_resource;
2721                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2722         }
2723         if (bmval1 & FATTR4_WORD1_MODE) {
2724                 p = xdr_reserve_space(xdr, 4);
2725                 if (!p)
2726                         goto out_resource;
2727                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2728         }
2729         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2730                 p = xdr_reserve_space(xdr, 4);
2731                 if (!p)
2732                         goto out_resource;
2733                 *p++ = cpu_to_be32(1);
2734         }
2735         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2736                 p = xdr_reserve_space(xdr, 4);
2737                 if (!p)
2738                         goto out_resource;
2739                 *p++ = cpu_to_be32(stat.nlink);
2740         }
2741         if (bmval1 & FATTR4_WORD1_OWNER) {
2742                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2743                 if (status)
2744                         goto out;
2745         }
2746         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2747                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2748                 if (status)
2749                         goto out;
2750         }
2751         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2752                 p = xdr_reserve_space(xdr, 8);
2753                 if (!p)
2754                         goto out_resource;
2755                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2756                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2757         }
2758         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2759                 p = xdr_reserve_space(xdr, 8);
2760                 if (!p)
2761                         goto out_resource;
2762                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2763                 p = xdr_encode_hyper(p, dummy64);
2764         }
2765         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2766                 p = xdr_reserve_space(xdr, 8);
2767                 if (!p)
2768                         goto out_resource;
2769                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2770                 p = xdr_encode_hyper(p, dummy64);
2771         }
2772         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2773                 p = xdr_reserve_space(xdr, 8);
2774                 if (!p)
2775                         goto out_resource;
2776                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2777                 p = xdr_encode_hyper(p, dummy64);
2778         }
2779         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2780                 p = xdr_reserve_space(xdr, 8);
2781                 if (!p)
2782                         goto out_resource;
2783                 dummy64 = (u64)stat.blocks << 9;
2784                 p = xdr_encode_hyper(p, dummy64);
2785         }
2786         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2787                 p = xdr_reserve_space(xdr, 12);
2788                 if (!p)
2789                         goto out_resource;
2790                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2791                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2792         }
2793         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2794                 p = xdr_reserve_space(xdr, 12);
2795                 if (!p)
2796                         goto out_resource;
2797                 *p++ = cpu_to_be32(0);
2798                 *p++ = cpu_to_be32(1);
2799                 *p++ = cpu_to_be32(0);
2800         }
2801         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2802                 p = xdr_reserve_space(xdr, 12);
2803                 if (!p)
2804                         goto out_resource;
2805                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2806                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2807         }
2808         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2809                 p = xdr_reserve_space(xdr, 12);
2810                 if (!p)
2811                         goto out_resource;
2812                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2813                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2814         }
2815         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2816                 struct kstat parent_stat;
2817                 u64 ino = stat.ino;
2818 
2819                 p = xdr_reserve_space(xdr, 8);
2820                 if (!p)
2821                         goto out_resource;
2822                 /*
2823                  * Get parent's attributes if not ignoring crossmount
2824                  * and this is the root of a cross-mounted filesystem.
2825                  */
2826                 if (ignore_crossmnt == 0 &&
2827                     dentry == exp->ex_path.mnt->mnt_root) {
2828                         err = get_parent_attributes(exp, &parent_stat);
2829                         if (err)
2830                                 goto out_nfserr;
2831                         ino = parent_stat.ino;
2832                 }
2833                 p = xdr_encode_hyper(p, ino);
2834         }
2835 #ifdef CONFIG_NFSD_PNFS
2836         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2837                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2838                 if (status)
2839                         goto out;
2840         }
2841 
2842         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2843                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2844                 if (status)
2845                         goto out;
2846         }
2847 
2848         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2849                 p = xdr_reserve_space(xdr, 4);
2850                 if (!p)
2851                         goto out_resource;
2852                 *p++ = cpu_to_be32(stat.blksize);
2853         }
2854 #endif /* CONFIG_NFSD_PNFS */
2855         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2856                 u32 supp[3];
2857 
2858                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2859                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2860                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2861                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2862 
2863                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2864                 if (status)
2865                         goto out;
2866         }
2867 
2868         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2869                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2870                                                                 contextlen);
2871                 if (status)
2872                         goto out;
2873         }
2874 
2875         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2876         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2877         status = nfs_ok;
2878 
2879 out:
2880 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2881         if (context)
2882                 security_release_secctx(context, contextlen);
2883 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2884         kfree(acl);
2885         if (tempfh) {
2886                 fh_put(tempfh);
2887                 kfree(tempfh);
2888         }
2889         if (status)
2890                 xdr_truncate_encode(xdr, starting_len);
2891         return status;
2892 out_nfserr:
2893         status = nfserrno(err);
2894         goto out;
2895 out_resource:
2896         status = nfserr_resource;
2897         goto out;
2898 }
2899 
2900 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2901                                 struct xdr_buf *buf, __be32 *p, int bytes)
2902 {
2903         xdr->scratch.iov_len = 0;
2904         memset(buf, 0, sizeof(struct xdr_buf));
2905         buf->head[0].iov_base = p;
2906         buf->head[0].iov_len = 0;
2907         buf->len = 0;
2908         xdr->buf = buf;
2909         xdr->iov = buf->head;
2910         xdr->p = p;
2911         xdr->end = (void *)p + bytes;
2912         buf->buflen = bytes;
2913 }
2914 
2915 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2916                         struct svc_fh *fhp, struct svc_export *exp,
2917                         struct dentry *dentry, u32 *bmval,
2918                         struct svc_rqst *rqstp, int ignore_crossmnt)
2919 {
2920         struct xdr_buf dummy;
2921         struct xdr_stream xdr;
2922         __be32 ret;
2923 
2924         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2925         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2926                                                         ignore_crossmnt);
2927         *p = xdr.p;
2928         return ret;
2929 }
2930 
2931 static inline int attributes_need_mount(u32 *bmval)
2932 {
2933         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2934                 return 1;
2935         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2936                 return 1;
2937         return 0;
2938 }
2939 
2940 static __be32
2941 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2942                         const char *name, int namlen)
2943 {
2944         struct svc_export *exp = cd->rd_fhp->fh_export;
2945         struct dentry *dentry;
2946         __be32 nfserr;
2947         int ignore_crossmnt = 0;
2948 
2949         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2950         if (IS_ERR(dentry))
2951                 return nfserrno(PTR_ERR(dentry));
2952         if (d_really_is_negative(dentry)) {
2953                 /*
2954                  * we're not holding the i_mutex here, so there's
2955                  * a window where this directory entry could have gone
2956                  * away.
2957                  */
2958                 dput(dentry);
2959                 return nfserr_noent;
2960         }
2961 
2962         exp_get(exp);
2963         /*
2964          * In the case of a mountpoint, the client may be asking for
2965          * attributes that are only properties of the underlying filesystem
2966          * as opposed to the cross-mounted file system. In such a case,
2967          * we will not follow the cross mount and will fill the attribtutes
2968          * directly from the mountpoint dentry.
2969          */
2970         if (nfsd_mountpoint(dentry, exp)) {
2971                 int err;
2972 
2973                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2974                                 && !attributes_need_mount(cd->rd_bmval)) {
2975                         ignore_crossmnt = 1;
2976                         goto out_encode;
2977                 }
2978                 /*
2979                  * Why the heck aren't we just using nfsd_lookup??
2980                  * Different "."/".." handling?  Something else?
2981                  * At least, add a comment here to explain....
2982                  */
2983                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2984                 if (err) {
2985                         nfserr = nfserrno(err);
2986                         goto out_put;
2987                 }
2988                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2989                 if (nfserr)
2990                         goto out_put;
2991 
2992         }
2993 out_encode:
2994         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2995                                         cd->rd_rqstp, ignore_crossmnt);
2996 out_put:
2997         dput(dentry);
2998         exp_put(exp);
2999         return nfserr;
3000 }
3001 
3002 static __be32 *
3003 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3004 {
3005         __be32 *p;
3006 
3007         p = xdr_reserve_space(xdr, 20);
3008         if (!p)
3009                 return NULL;
3010         *p++ = htonl(2);
3011         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3012         *p++ = htonl(0);                         /* bmval1 */
3013 
3014         *p++ = htonl(4);     /* attribute length */
3015         *p++ = nfserr;       /* no htonl */
3016         return p;
3017 }
3018 
3019 static int
3020 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3021                     loff_t offset, u64 ino, unsigned int d_type)
3022 {
3023         struct readdir_cd *ccd = ccdv;
3024         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3025         struct xdr_stream *xdr = cd->xdr;
3026         int start_offset = xdr->buf->len;
3027         int cookie_offset;
3028         u32 name_and_cookie;
3029         int entry_bytes;
3030         __be32 nfserr = nfserr_toosmall;
3031         __be64 wire_offset;
3032         __be32 *p;
3033 
3034         /* In nfsv4, "." and ".." never make it onto the wire.. */
3035         if (name && isdotent(name, namlen)) {
3036                 cd->common.err = nfs_ok;
3037                 return 0;
3038         }
3039 
3040         if (cd->cookie_offset) {
3041                 wire_offset = cpu_to_be64(offset);
3042                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3043                                                         &wire_offset, 8);
3044         }
3045 
3046         p = xdr_reserve_space(xdr, 4);
3047         if (!p)
3048                 goto fail;
3049         *p++ = xdr_one;                             /* mark entry present */
3050         cookie_offset = xdr->buf->len;
3051         p = xdr_reserve_space(xdr, 3*4 + namlen);
3052         if (!p)
3053                 goto fail;
3054         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3055         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3056 
3057         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3058         switch (nfserr) {
3059         case nfs_ok:
3060                 break;
3061         case nfserr_resource:
3062                 nfserr = nfserr_toosmall;
3063                 goto fail;
3064         case nfserr_noent:
3065                 xdr_truncate_encode(xdr, start_offset);
3066                 goto skip_entry;
3067         default:
3068                 /*
3069                  * If the client requested the RDATTR_ERROR attribute,
3070                  * we stuff the error code into this attribute
3071                  * and continue.  If this attribute was not requested,
3072                  * then in accordance with the spec, we fail the
3073                  * entire READDIR operation(!)
3074                  */
3075                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3076                         goto fail;
3077                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3078                 if (p == NULL) {
3079                         nfserr = nfserr_toosmall;
3080                         goto fail;
3081                 }
3082         }
3083         nfserr = nfserr_toosmall;
3084         entry_bytes = xdr->buf->len - start_offset;
3085         if (entry_bytes > cd->rd_maxcount)
3086                 goto fail;
3087         cd->rd_maxcount -= entry_bytes;
3088         /*
3089          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3090          * let's always let through the first entry, at least:
3091          */
3092         if (!cd->rd_dircount)
3093                 goto fail;
3094         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3095         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3096                 goto fail;
3097         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3098 
3099         cd->cookie_offset = cookie_offset;
3100 skip_entry:
3101         cd->common.err = nfs_ok;
3102         return 0;
3103 fail:
3104         xdr_truncate_encode(xdr, start_offset);
3105         cd->common.err = nfserr;
3106         return -EINVAL;
3107 }
3108 
3109 static __be32
3110 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3111 {
3112         __be32 *p;
3113 
3114         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3115         if (!p)
3116                 return nfserr_resource;
3117         *p++ = cpu_to_be32(sid->si_generation);
3118         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3119                                         sizeof(stateid_opaque_t));
3120         return 0;
3121 }
3122 
3123 static __be32
3124 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3125 {
3126         struct xdr_stream *xdr = &resp->xdr;
3127         __be32 *p;
3128 
3129         p = xdr_reserve_space(xdr, 8);
3130         if (!p)
3131                 return nfserr_resource;
3132         *p++ = cpu_to_be32(access->ac_supported);
3133         *p++ = cpu_to_be32(access->ac_resp_access);
3134         return 0;
3135 }
3136 
3137 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3138 {
3139         struct xdr_stream *xdr = &resp->xdr;
3140         __be32 *p;
3141 
3142         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3143         if (!p)
3144                 return nfserr_resource;
3145         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3146                                         NFS4_MAX_SESSIONID_LEN);
3147         *p++ = cpu_to_be32(bcts->dir);
3148         /* Upshifting from TCP to RDMA is not supported */
3149         *p++ = cpu_to_be32(0);
3150         return 0;
3151 }
3152 
3153 static __be32
3154 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3155 {
3156         struct xdr_stream *xdr = &resp->xdr;
3157 
3158         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3159 }
3160 
3161 
3162 static __be32
3163 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3164 {
3165         struct xdr_stream *xdr = &resp->xdr;
3166         __be32 *p;
3167 
3168         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3169         if (!p)
3170                 return nfserr_resource;
3171         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3172                                                 NFS4_VERIFIER_SIZE);
3173         return 0;
3174 }
3175 
3176 static __be32
3177 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3178 {
3179         struct xdr_stream *xdr = &resp->xdr;
3180         __be32 *p;
3181 
3182         p = xdr_reserve_space(xdr, 20);
3183         if (!p)
3184                 return nfserr_resource;
3185         encode_cinfo(p, &create->cr_cinfo);
3186         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3187                         create->cr_bmval[1], create->cr_bmval[2]);
3188         return 0;
3189 }
3190 
3191 static __be32
3192 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3193 {
3194         struct svc_fh *fhp = getattr->ga_fhp;
3195         struct xdr_stream *xdr = &resp->xdr;
3196 
3197         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3198                                     getattr->ga_bmval, resp->rqstp, 0);
3199 }
3200 
3201 static __be32
3202 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3203 {
3204         struct xdr_stream *xdr = &resp->xdr;
3205         struct svc_fh *fhp = *fhpp;
3206         unsigned int len;
3207         __be32 *p;
3208 
3209         len = fhp->fh_handle.fh_size;
3210         p = xdr_reserve_space(xdr, len + 4);
3211         if (!p)
3212                 return nfserr_resource;
3213         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3214         return 0;
3215 }
3216 
3217 /*
3218 * Including all fields other than the name, a LOCK4denied structure requires
3219 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3220 */
3221 static __be32
3222 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3223 {
3224         struct xdr_netobj *conf = &ld->ld_owner;
3225         __be32 *p;
3226 
3227 again:
3228         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3229         if (!p) {
3230                 /*
3231                  * Don't fail to return the result just because we can't
3232                  * return the conflicting open:
3233                  */
3234                 if (conf->len) {
3235                         kfree(conf->data);
3236                         conf->len = 0;
3237                         conf->data = NULL;
3238                         goto again;
3239                 }
3240                 return nfserr_resource;
3241         }
3242         p = xdr_encode_hyper(p, ld->ld_start);
3243         p = xdr_encode_hyper(p, ld->ld_length);
3244         *p++ = cpu_to_be32(ld->ld_type);
3245         if (conf->len) {
3246                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3247                 p = xdr_encode_opaque(p, conf->data, conf->len);
3248                 kfree(conf->data);
3249         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3250                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3251                 *p++ = cpu_to_be32(0); /* length of owner name */
3252         }
3253         return nfserr_denied;
3254 }
3255 
3256 static __be32
3257 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3258 {
3259         struct xdr_stream *xdr = &resp->xdr;
3260 
3261         if (!nfserr)
3262                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3263         else if (nfserr == nfserr_denied)
3264                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3265 
3266         return nfserr;
3267 }
3268 
3269 static __be32
3270 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3271 {
3272         struct xdr_stream *xdr = &resp->xdr;
3273 
3274         if (nfserr == nfserr_denied)
3275                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3276         return nfserr;
3277 }
3278 
3279 static __be32
3280 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3281 {
3282         struct xdr_stream *xdr = &resp->xdr;
3283 
3284         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3285 }
3286 
3287 
3288 static __be32
3289 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3290 {
3291         struct xdr_stream *xdr = &resp->xdr;
3292         __be32 *p;
3293 
3294         p = xdr_reserve_space(xdr, 20);
3295         if (!p)
3296                 return nfserr_resource;
3297         p = encode_cinfo(p, &link->li_cinfo);
3298         return 0;
3299 }
3300 
3301 
3302 static __be32
3303 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3304 {
3305         struct xdr_stream *xdr = &resp->xdr;
3306         __be32 *p;
3307 
3308         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3309         if (nfserr)
3310                 return nfserr;
3311         p = xdr_reserve_space(xdr, 24);
3312         if (!p)
3313                 return nfserr_resource;
3314         p = encode_cinfo(p, &open->op_cinfo);
3315         *p++ = cpu_to_be32(open->op_rflags);
3316 
3317         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3318                                         open->op_bmval[2]);
3319         if (nfserr)
3320                 return nfserr;
3321 
3322         p = xdr_reserve_space(xdr, 4);
3323         if (!p)
3324                 return nfserr_resource;
3325 
3326         *p++ = cpu_to_be32(open->op_delegate_type);
3327         switch (open->op_delegate_type) {
3328         case NFS4_OPEN_DELEGATE_NONE:
3329                 break;
3330         case NFS4_OPEN_DELEGATE_READ:
3331                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3332                 if (nfserr)
3333                         return nfserr;
3334                 p = xdr_reserve_space(xdr, 20);
3335                 if (!p)
3336                         return nfserr_resource;
3337                 *p++ = cpu_to_be32(open->op_recall);
3338 
3339                 /*
3340                  * TODO: ACE's in delegations
3341                  */
3342                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3343                 *p++ = cpu_to_be32(0);
3344                 *p++ = cpu_to_be32(0);
3345                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3346                 break;
3347         case NFS4_OPEN_DELEGATE_WRITE:
3348                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3349                 if (nfserr)
3350                         return nfserr;
3351                 p = xdr_reserve_space(xdr, 32);
3352                 if (!p)
3353                         return nfserr_resource;
3354                 *p++ = cpu_to_be32(0);
3355 
3356                 /*
3357                  * TODO: space_limit's in delegations
3358                  */
3359                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3360                 *p++ = cpu_to_be32(~(u32)0);
3361                 *p++ = cpu_to_be32(~(u32)0);
3362 
3363                 /*
3364                  * TODO: ACE's in delegations
3365                  */
3366                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3367                 *p++ = cpu_to_be32(0);
3368                 *p++ = cpu_to_be32(0);
3369                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3370                 break;
3371         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3372                 switch (open->op_why_no_deleg) {
3373                 case WND4_CONTENTION:
3374                 case WND4_RESOURCE:
3375                         p = xdr_reserve_space(xdr, 8);
3376                         if (!p)
3377                                 return nfserr_resource;
3378                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3379                         /* deleg signaling not supported yet: */
3380                         *p++ = cpu_to_be32(0);
3381                         break;
3382                 default:
3383                         p = xdr_reserve_space(xdr, 4);
3384                         if (!p)
3385                                 return nfserr_resource;
3386                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3387                 }
3388                 break;
3389         default:
3390                 BUG();
3391         }
3392         /* XXX save filehandle here */
3393         return 0;
3394 }
3395 
3396 static __be32
3397 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3398 {
3399         struct xdr_stream *xdr = &resp->xdr;
3400 
3401         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3402 }
3403 
3404 static __be32
3405 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3406 {
3407         struct xdr_stream *xdr = &resp->xdr;
3408 
3409         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3410 }
3411 
3412 static __be32 nfsd4_encode_splice_read(
3413                                 struct nfsd4_compoundres *resp,
3414                                 struct nfsd4_read *read,
3415                                 struct file *file, unsigned long maxcount)
3416 {
3417         struct xdr_stream *xdr = &resp->xdr;
3418         struct xdr_buf *buf = xdr->buf;
3419         u32 eof;
3420         long len;
3421         int space_left;
3422         __be32 nfserr;
3423         __be32 *p = xdr->p - 2;
3424 
3425         /* Make sure there will be room for padding if needed */
3426         if (xdr->end - xdr->p < 1)
3427                 return nfserr_resource;
3428 
3429         len = maxcount;
3430         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3431                                   file, read->rd_offset, &maxcount);
3432         read->rd_length = maxcount;
3433         if (nfserr) {
3434                 /*
3435                  * nfsd_splice_actor may have already messed with the
3436                  * page length; reset it so as not to confuse
3437                  * xdr_truncate_encode:
3438                  */
3439                 buf->page_len = 0;
3440                 return nfserr;
3441         }
3442 
3443         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3444                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3445 
3446         *(p++) = htonl(eof);
3447         *(p++) = htonl(maxcount);
3448 
3449         buf->page_len = maxcount;
3450         buf->len += maxcount;
3451         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3452                                                         / PAGE_SIZE;
3453 
3454         /* Use rest of head for padding and remaining ops: */
3455         buf->tail[0].iov_base = xdr->p;
3456         buf->tail[0].iov_len = 0;
3457         xdr->iov = buf->tail;
3458         if (maxcount&3) {
3459                 int pad = 4 - (maxcount&3);
3460 
3461                 *(xdr->p++) = 0;
3462 
3463                 buf->tail[0].iov_base += maxcount&3;
3464                 buf->tail[0].iov_len = pad;
3465                 buf->len += pad;
3466         }
3467 
3468         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3469                                 buf->buflen - buf->len);
3470         buf->buflen = buf->len + space_left;
3471         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3472 
3473         return 0;
3474 }
3475 
3476 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3477                                  struct nfsd4_read *read,
3478                                  struct file *file, unsigned long maxcount)
3479 {
3480         struct xdr_stream *xdr = &resp->xdr;
3481         u32 eof;
3482         int v;
3483         int starting_len = xdr->buf->len - 8;
3484         long len;
3485         int thislen;
3486         __be32 nfserr;
3487         __be32 tmp;
3488         __be32 *p;
3489         u32 zzz = 0;
3490         int pad;
3491 
3492         len = maxcount;
3493         v = 0;
3494 
3495         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3496         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3497         WARN_ON_ONCE(!p);
3498         resp->rqstp->rq_vec[v].iov_base = p;
3499         resp->rqstp->rq_vec[v].iov_len = thislen;
3500         v++;
3501         len -= thislen;
3502 
3503         while (len) {
3504                 thislen = min_t(long, len, PAGE_SIZE);
3505                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3506                 WARN_ON_ONCE(!p);
3507                 resp->rqstp->rq_vec[v].iov_base = p;
3508                 resp->rqstp->rq_vec[v].iov_len = thislen;
3509                 v++;
3510                 len -= thislen;
3511         }
3512         read->rd_vlen = v;
3513 
3514         len = maxcount;
3515         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3516                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3517         read->rd_length = maxcount;
3518         if (nfserr)
3519                 return nfserr;
3520         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3521 
3522         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3523                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3524 
3525         tmp = htonl(eof);
3526         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3527         tmp = htonl(maxcount);
3528         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3529 
3530         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3531         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3532                                                                 &zzz, pad);
3533         return 0;
3534 
3535 }
3536 
3537 static __be32
3538 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3539                   struct nfsd4_read *read)
3540 {
3541         unsigned long maxcount;
3542         struct xdr_stream *xdr = &resp->xdr;
3543         struct file *file = read->rd_filp;
3544         int starting_len = xdr->buf->len;
3545         struct raparms *ra = NULL;
3546         __be32 *p;
3547 
3548         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3549         if (!p) {
3550                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3551                 return nfserr_resource;
3552         }
3553         if (resp->xdr.buf->page_len &&
3554             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3555                 WARN_ON_ONCE(1);
3556                 return nfserr_resource;
3557         }
3558         xdr_commit_encode(xdr);
3559 
3560         maxcount = svc_max_payload(resp->rqstp);
3561         maxcount = min_t(unsigned long, maxcount,
3562                          (xdr->buf->buflen - xdr->buf->len));
3563         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3564 
3565         if (read->rd_tmp_file)
3566                 ra = nfsd_init_raparms(file);
3567 
3568         if (file->f_op->splice_read &&
3569             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3570                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3571         else
3572                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3573 
3574         if (ra)
3575                 nfsd_put_raparams(file, ra);
3576 
3577         if (nfserr)
3578                 xdr_truncate_encode(xdr, starting_len);
3579 
3580         return nfserr;
3581 }
3582 
3583 static __be32
3584 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3585 {
3586         int maxcount;
3587         __be32 wire_count;
3588         int zero = 0;
3589         struct xdr_stream *xdr = &resp->xdr;
3590         int length_offset = xdr->buf->len;
3591         __be32 *p;
3592 
3593         p = xdr_reserve_space(xdr, 4);
3594         if (!p)
3595                 return nfserr_resource;
3596         maxcount = PAGE_SIZE;
3597 
3598         p = xdr_reserve_space(xdr, maxcount);
3599         if (!p)
3600                 return nfserr_resource;
3601         /*
3602          * XXX: By default, vfs_readlink() will truncate symlinks if they
3603          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3604          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3605          * that truncation occurred, and return NFS4ERR_RESOURCE.
3606          */
3607         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3608                                                 (char *)p, &maxcount);
3609         if (nfserr == nfserr_isdir)
3610                 nfserr = nfserr_inval;
3611         if (nfserr) {
3612                 xdr_truncate_encode(xdr, length_offset);
3613                 return nfserr;
3614         }
3615 
3616         wire_count = htonl(maxcount);
3617         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3618         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3619         if (maxcount & 3)
3620                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3621                                                 &zero, 4 - (maxcount&3));
3622         return 0;
3623 }
3624 
3625 static __be32
3626 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3627 {
3628         int maxcount;
3629         int bytes_left;
3630         loff_t offset;
3631         __be64 wire_offset;
3632         struct xdr_stream *xdr = &resp->xdr;
3633         int starting_len = xdr->buf->len;
3634         __be32 *p;
3635 
3636         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3637         if (!p)
3638                 return nfserr_resource;
3639 
3640         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3641         *p++ = cpu_to_be32(0);
3642         *p++ = cpu_to_be32(0);
3643         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3644                                 - (char *)resp->xdr.buf->head[0].iov_base;
3645 
3646         /*
3647          * Number of bytes left for directory entries allowing for the
3648          * final 8 bytes of the readdir and a following failed op:
3649          */
3650         bytes_left = xdr->buf->buflen - xdr->buf->len
3651                         - COMPOUND_ERR_SLACK_SPACE - 8;
3652         if (bytes_left < 0) {
3653                 nfserr = nfserr_resource;
3654                 goto err_no_verf;
3655         }
3656         maxcount = svc_max_payload(resp->rqstp);
3657         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3658         /*
3659          * Note the rfc defines rd_maxcount as the size of the
3660          * READDIR4resok structure, which includes the verifier above
3661          * and the 8 bytes encoded at the end of this function:
3662          */
3663         if (maxcount < 16) {
3664                 nfserr = nfserr_toosmall;
3665                 goto err_no_verf;
3666         }
3667         maxcount = min_t(int, maxcount-16, bytes_left);
3668 
3669         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3670         if (!readdir->rd_dircount)
3671                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3672 
3673         readdir->xdr = xdr;
3674         readdir->rd_maxcount = maxcount;
3675         readdir->common.err = 0;
3676         readdir->cookie_offset = 0;
3677 
3678         offset = readdir->rd_cookie;
3679         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3680                               &offset,
3681                               &readdir->common, nfsd4_encode_dirent);
3682         if (nfserr == nfs_ok &&
3683             readdir->common.err == nfserr_toosmall &&
3684             xdr->buf->len == starting_len + 8) {
3685                 /* nothing encoded; which limit did we hit?: */
3686                 if (maxcount - 16 < bytes_left)
3687                         /* It was the fault of rd_maxcount: */
3688                         nfserr = nfserr_toosmall;
3689                 else
3690                         /* We ran out of buffer space: */
3691                         nfserr = nfserr_resource;
3692         }
3693         if (nfserr)
3694                 goto err_no_verf;
3695 
3696         if (readdir->cookie_offset) {
3697                 wire_offset = cpu_to_be64(offset);
3698                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3699                                                         &wire_offset, 8);
3700         }
3701 
3702         p = xdr_reserve_space(xdr, 8);
3703         if (!p) {
3704                 WARN_ON_ONCE(1);
3705                 goto err_no_verf;
3706         }
3707         *p++ = 0;       /* no more entries */
3708         *p++ = htonl(readdir->common.err == nfserr_eof);
3709 
3710         return 0;
3711 err_no_verf:
3712         xdr_truncate_encode(xdr, starting_len);
3713         return nfserr;
3714 }
3715 
3716 static __be32
3717 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3718 {
3719         struct xdr_stream *xdr = &resp->xdr;
3720         __be32 *p;
3721 
3722         p = xdr_reserve_space(xdr, 20);
3723         if (!p)
3724                 return nfserr_resource;
3725         p = encode_cinfo(p, &remove->rm_cinfo);
3726         return 0;
3727 }
3728 
3729 static __be32
3730 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3731 {
3732         struct xdr_stream *xdr = &resp->xdr;
3733         __be32 *p;
3734 
3735         p = xdr_reserve_space(xdr, 40);
3736         if (!p)
3737                 return nfserr_resource;
3738         p = encode_cinfo(p, &rename->rn_sinfo);
3739         p = encode_cinfo(p, &rename->rn_tinfo);
3740         return 0;
3741 }
3742 
3743 static __be32
3744 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3745 {
3746         u32 i, nflavs, supported;
3747         struct exp_flavor_info *flavs;
3748         struct exp_flavor_info def_flavs[2];
3749         __be32 *p, *flavorsp;
3750         static bool report = true;
3751 
3752         if (exp->ex_nflavors) {
3753                 flavs = exp->ex_flavors;
3754                 nflavs = exp->ex_nflavors;
3755         } else { /* Handling of some defaults in absence of real secinfo: */
3756                 flavs = def_flavs;
3757                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3758                         nflavs = 2;
3759                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3760                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3761                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3762                         nflavs = 1;
3763                         flavs[0].pseudoflavor
3764                                         = svcauth_gss_flavor(exp->ex_client);
3765                 } else {
3766                         nflavs = 1;
3767                         flavs[0].pseudoflavor
3768                                         = exp->ex_client->flavour->flavour;
3769                 }
3770         }
3771 
3772         supported = 0;
3773         p = xdr_reserve_space(xdr, 4);
3774         if (!p)
3775                 return nfserr_resource;
3776         flavorsp = p++;         /* to be backfilled later */
3777 
3778         for (i = 0; i < nflavs; i++) {
3779                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3780                 struct rpcsec_gss_info info;
3781 
3782                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3783                         supported++;
3784                         p = xdr_reserve_space(xdr, 4 + 4 +
3785                                               XDR_LEN(info.oid.len) + 4 + 4);
3786                         if (!p)
3787                                 return nfserr_resource;
3788                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3789                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3790                         *p++ = cpu_to_be32(info.qop);
3791                         *p++ = cpu_to_be32(info.service);
3792                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3793                         supported++;
3794                         p = xdr_reserve_space(xdr, 4);
3795                         if (!p)
3796                                 return nfserr_resource;
3797                         *p++ = cpu_to_be32(pf);
3798                 } else {
3799                         if (report)
3800                                 pr_warn("NFS: SECINFO: security flavor %u "
3801                                         "is not supported\n", pf);
3802                 }
3803         }
3804 
3805         if (nflavs != supported)
3806                 report = false;
3807         *flavorsp = htonl(supported);
3808         return 0;
3809 }
3810 
3811 static __be32
3812 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3813                      struct nfsd4_secinfo *secinfo)
3814 {
3815         struct xdr_stream *xdr = &resp->xdr;
3816 
3817         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3818 }
3819 
3820 static __be32
3821 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3822                      struct nfsd4_secinfo_no_name *secinfo)
3823 {
3824         struct xdr_stream *xdr = &resp->xdr;
3825 
3826         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3827 }
3828 
3829 /*
3830  * The SETATTR encode routine is special -- it always encodes a bitmap,
3831  * regardless of the error status.
3832  */
3833 static __be32
3834 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3835 {
3836         struct xdr_stream *xdr = &resp->xdr;
3837         __be32 *p;
3838 
3839         p = xdr_reserve_space(xdr, 16);
3840         if (!p)
3841                 return nfserr_resource;
3842         if (nfserr) {
3843                 *p++ = cpu_to_be32(3);
3844                 *p++ = cpu_to_be32(0);
3845                 *p++ = cpu_to_be32(0);
3846                 *p++ = cpu_to_be32(0);
3847         }
3848         else {
3849                 *p++ = cpu_to_be32(3);
3850                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3851                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3852                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3853         }
3854         return nfserr;
3855 }
3856 
3857 static __be32
3858 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3859 {
3860         struct xdr_stream *xdr = &resp->xdr;
3861         __be32 *p;
3862 
3863         if (!nfserr) {
3864                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3865                 if (!p)
3866                         return nfserr_resource;
3867                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3868                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3869                                                 NFS4_VERIFIER_SIZE);
3870         }
3871         else if (nfserr == nfserr_clid_inuse) {
3872                 p = xdr_reserve_space(xdr, 8);
3873                 if (!p)
3874                         return nfserr_resource;
3875                 *p++ = cpu_to_be32(0);
3876                 *p++ = cpu_to_be32(0);
3877         }
3878         return nfserr;
3879 }
3880 
3881 static __be32
3882 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3883 {
3884         struct xdr_stream *xdr = &resp->xdr;
3885         __be32 *p;
3886 
3887         p = xdr_reserve_space(xdr, 16);
3888         if (!p)
3889                 return nfserr_resource;
3890         *p++ = cpu_to_be32(write->wr_bytes_written);
3891         *p++ = cpu_to_be32(write->wr_how_written);
3892         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3893                                                 NFS4_VERIFIER_SIZE);
3894         return 0;
3895 }
3896 
3897 static __be32
3898 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3899                          struct nfsd4_exchange_id *exid)
3900 {
3901         struct xdr_stream *xdr = &resp->xdr;
3902         __be32 *p;
3903         char *major_id;
3904         char *server_scope;
3905         int major_id_sz;
3906         int server_scope_sz;
3907         uint64_t minor_id = 0;
3908 
3909         major_id = utsname()->nodename;
3910         major_id_sz = strlen(major_id);
3911         server_scope = utsname()->nodename;
3912         server_scope_sz = strlen(server_scope);
3913 
3914         p = xdr_reserve_space(xdr,
3915                 8 /* eir_clientid */ +
3916                 4 /* eir_sequenceid */ +
3917                 4 /* eir_flags */ +
3918                 4 /* spr_how */);
3919         if (!p)
3920                 return nfserr_resource;
3921 
3922         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3923         *p++ = cpu_to_be32(exid->seqid);
3924         *p++ = cpu_to_be32(exid->flags);
3925 
3926         *p++ = cpu_to_be32(exid->spa_how);
3927 
3928         switch (exid->spa_how) {
3929         case SP4_NONE:
3930                 break;
3931         case SP4_MACH_CRED:
3932                 /* spo_must_enforce bitmap: */
3933                 nfserr = nfsd4_encode_bitmap(xdr,
3934                                         exid->spo_must_enforce[0],
3935                                         exid->spo_must_enforce[1],
3936                                         exid->spo_must_enforce[2]);
3937                 if (nfserr)
3938                         return nfserr;
3939                 /* spo_must_allow bitmap: */
3940                 nfserr = nfsd4_encode_bitmap(xdr,
3941                                         exid->spo_must_allow[0],
3942                                         exid->spo_must_allow[1],
3943                                         exid->spo_must_allow[2]);
3944                 if (nfserr)
3945                         return nfserr;
3946                 break;
3947         default:
3948                 WARN_ON_ONCE(1);
3949         }
3950 
3951         p = xdr_reserve_space(xdr,
3952                 8 /* so_minor_id */ +
3953                 4 /* so_major_id.len */ +
3954                 (XDR_QUADLEN(major_id_sz) * 4) +
3955                 4 /* eir_server_scope.len */ +
3956                 (XDR_QUADLEN(server_scope_sz) * 4) +
3957                 4 /* eir_server_impl_id.count (0) */);
3958         if (!p)
3959                 return nfserr_resource;
3960 
3961         /* The server_owner struct */
3962         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
3963         /* major id */
3964         p = xdr_encode_opaque(p, major_id, major_id_sz);
3965 
3966         /* Server scope */
3967         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3968 
3969         /* Implementation id */
3970         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
3971         return 0;
3972 }
3973 
3974 static __be32
3975 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3976                             struct nfsd4_create_session *sess)
3977 {
3978         struct xdr_stream *xdr = &resp->xdr;
3979         __be32 *p;
3980 
3981         p = xdr_reserve_space(xdr, 24);
3982         if (!p)
3983                 return nfserr_resource;
3984         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3985                                         NFS4_MAX_SESSIONID_LEN);
3986         *p++ = cpu_to_be32(sess->seqid);
3987         *p++ = cpu_to_be32(sess->flags);
3988 
3989         p = xdr_reserve_space(xdr, 28);
3990         if (!p)
3991                 return nfserr_resource;
3992         *p++ = cpu_to_be32(0); /* headerpadsz */
3993         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3994         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3995         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3996         *p++ = cpu_to_be32(sess->fore_channel.maxops);
3997         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3998         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3999 
4000         if (sess->fore_channel.nr_rdma_attrs) {
4001                 p = xdr_reserve_space(xdr, 4);
4002                 if (!p)
4003                         return nfserr_resource;
4004                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4005         }
4006 
4007         p = xdr_reserve_space(xdr, 28);
4008         if (!p)
4009                 return nfserr_resource;
4010         *p++ = cpu_to_be32(0); /* headerpadsz */
4011         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4012         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4013         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4014         *p++ = cpu_to_be32(sess->back_channel.maxops);
4015         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4016         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4017 
4018         if (sess->back_channel.nr_rdma_attrs) {
4019                 p = xdr_reserve_space(xdr, 4);
4020                 if (!p)
4021                         return nfserr_resource;
4022                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4023         }
4024         return 0;
4025 }
4026 
4027 static __be32
4028 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4029                       struct nfsd4_sequence *seq)
4030 {
4031         struct xdr_stream *xdr = &resp->xdr;
4032         __be32 *p;
4033 
4034         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4035         if (!p)
4036                 return nfserr_resource;
4037         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4038                                         NFS4_MAX_SESSIONID_LEN);
4039         *p++ = cpu_to_be32(seq->seqid);
4040         *p++ = cpu_to_be32(seq->slotid);
4041         /* Note slotid's are numbered from zero: */
4042         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4043         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4044         *p++ = cpu_to_be32(seq->status_flags);
4045 
4046         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4047         return 0;
4048 }
4049 
4050 static __be32
4051 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4052                           struct nfsd4_test_stateid *test_stateid)
4053 {
4054         struct xdr_stream *xdr = &resp->xdr;
4055         struct nfsd4_test_stateid_id *stateid, *next;
4056         __be32 *p;
4057 
4058         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4059         if (!p)
4060                 return nfserr_resource;
4061         *p++ = htonl(test_stateid->ts_num_ids);
4062 
4063         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4064                 *p++ = stateid->ts_id_status;
4065         }
4066 
4067         return 0;
4068 }
4069 
4070 #ifdef CONFIG_NFSD_PNFS
4071 static __be32
4072 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4073                 struct nfsd4_getdeviceinfo *gdev)
4074 {
4075         struct xdr_stream *xdr = &resp->xdr;
4076         const struct nfsd4_layout_ops *ops;
4077         u32 starting_len = xdr->buf->len, needed_len;
4078         __be32 *p;
4079 
4080         p = xdr_reserve_space(xdr, 4);
4081         if (!p)
4082                 return nfserr_resource;
4083 
4084         *p++ = cpu_to_be32(gdev->gd_layout_type);
4085 
4086         /* If maxcount is 0 then just update notifications */
4087         if (gdev->gd_maxcount != 0) {
4088                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4089                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4090                 if (nfserr) {
4091                         /*
4092                          * We don't bother to burden the layout drivers with
4093                          * enforcing gd_maxcount, just tell the client to
4094                          * come back with a bigger buffer if it's not enough.
4095                          */
4096                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4097                                 goto toosmall;
4098                         return nfserr;
4099                 }
4100         }
4101 
4102         if (gdev->gd_notify_types) {
4103                 p = xdr_reserve_space(xdr, 4 + 4);
4104                 if (!p)
4105                         return nfserr_resource;
4106                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4107                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4108         } else {
4109                 p = xdr_reserve_space(xdr, 4);
4110                 if (!p)
4111                         return nfserr_resource;
4112                 *p++ = 0;
4113         }
4114 
4115         return 0;
4116 toosmall:
4117         dprintk("%s: maxcount too small\n", __func__);
4118         needed_len = xdr->buf->len + 4 /* notifications */;
4119         xdr_truncate_encode(xdr, starting_len);
4120         p = xdr_reserve_space(xdr, 4);
4121         if (!p)
4122                 return nfserr_resource;
4123         *p++ = cpu_to_be32(needed_len);
4124         return nfserr_toosmall;
4125 }
4126 
4127 static __be32
4128 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4129                 struct nfsd4_layoutget *lgp)
4130 {
4131         struct xdr_stream *xdr = &resp->xdr;
4132         const struct nfsd4_layout_ops *ops;
4133         __be32 *p;
4134 
4135         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4136         if (!p)
4137                 return nfserr_resource;
4138 
4139         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4140         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4141         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4142                                     sizeof(stateid_opaque_t));
4143 
4144         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4145         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4146         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4147         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4148         *p++ = cpu_to_be32(lgp->lg_layout_type);
4149 
4150         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4151         return ops->encode_layoutget(xdr, lgp);
4152 }
4153 
4154 static __be32
4155 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4156                           struct nfsd4_layoutcommit *lcp)
4157 {
4158         struct xdr_stream *xdr = &resp->xdr;
4159         __be32 *p;
4160 
4161         p = xdr_reserve_space(xdr, 4);
4162         if (!p)
4163                 return nfserr_resource;
4164         *p++ = cpu_to_be32(lcp->lc_size_chg);
4165         if (lcp->lc_size_chg) {
4166                 p = xdr_reserve_space(xdr, 8);
4167                 if (!p)
4168                         return nfserr_resource;
4169                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4170         }
4171 
4172         return 0;
4173 }
4174 
4175 static __be32
4176 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4177                 struct nfsd4_layoutreturn *lrp)
4178 {
4179         struct xdr_stream *xdr = &resp->xdr;
4180         __be32 *p;
4181 
4182         p = xdr_reserve_space(xdr, 4);
4183         if (!p)
4184                 return nfserr_resource;
4185         *p++ = cpu_to_be32(lrp->lrs_present);
4186         if (lrp->lrs_present)
4187                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4188         return 0;
4189 }
4190 #endif /* CONFIG_NFSD_PNFS */
4191 
4192 static __be32
4193 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4194 {
4195         __be32 *p;
4196 
4197         p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4198         if (!p)
4199                 return nfserr_resource;
4200 
4201         *p++ = cpu_to_be32(0);
4202         p = xdr_encode_hyper(p, write->wr_bytes_written);
4203         *p++ = cpu_to_be32(write->wr_stable_how);
4204         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4205                                     NFS4_VERIFIER_SIZE);
4206         return nfs_ok;
4207 }
4208 
4209 static __be32
4210 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4211                   struct nfsd4_copy *copy)
4212 {
4213         __be32 *p;
4214 
4215         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4216         if (nfserr)
4217                 return nfserr;
4218 
4219         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4220         *p++ = xdr_one; /* cr_consecutive */
4221         *p++ = cpu_to_be32(copy->cp_synchronous);
4222         return 0;
4223 }
4224 
4225 static __be32
4226 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4227                   struct nfsd4_seek *seek)
4228 {
4229         __be32 *p;
4230 
4231         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4232         *p++ = cpu_to_be32(seek->seek_eof);
4233         p = xdr_encode_hyper(p, seek->seek_pos);
4234 
4235         return 0;
4236 }
4237 
4238 static __be32
4239 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4240 {
4241         return nfserr;
4242 }
4243 
4244 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4245 
4246 /*
4247  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4248  * since we don't need to filter out obsolete ops as this is
4249  * done in the decoding phase.
4250  */
4251 static const nfsd4_enc nfsd4_enc_ops[] = {
4252         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4253         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4254         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4255         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4256         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4257         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4258         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4259         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4260         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4261         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4262         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4263         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4264         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4265         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4266         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4267         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4268         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4269         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4270         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4271         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4272         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4273         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4274         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4275         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4276         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4277         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4278         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4279         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4280         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4281         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4282         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4283         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4284         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4285         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4286         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4287         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4288         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4289 
4290         /* NFSv4.1 operations */
4291         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4292         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4293         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4294         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4295         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4296         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4297         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4298 #ifdef CONFIG_NFSD_PNFS
4299         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4300         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4301         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4302         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4303         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4304 #else
4305         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4306         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4307         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4308         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4309         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4310 #endif
4311         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4312         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4313         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4314         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4315         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4316         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4317         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4318 
4319         /* NFSv4.2 operations */
4320         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4321         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4322         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4323         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4324         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4325         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4326         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4327         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4328         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_noop,
4329         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4330         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4331         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4332         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4333 };
4334 
4335 /*
4336  * Calculate whether we still have space to encode repsize bytes.
4337  * There are two considerations:
4338  *     - For NFS versions >=4.1, the size of the reply must stay within
4339  *       session limits
4340  *     - For all NFS versions, we must stay within limited preallocated
4341  *       buffer space.
4342  *
4343  * This is called before the operation is processed, so can only provide
4344  * an upper estimate.  For some nonidempotent operations (such as
4345  * getattr), it's not necessarily a problem if that estimate is wrong,
4346  * as we can fail it after processing without significant side effects.
4347  */
4348 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4349 {
4350         struct xdr_buf *buf = &resp->rqstp->rq_res;
4351         struct nfsd4_slot *slot = resp->cstate.slot;
4352 
4353         if (buf->len + respsize <= buf->buflen)
4354                 return nfs_ok;
4355         if (!nfsd4_has_session(&resp->cstate))
4356                 return nfserr_resource;
4357         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4358                 WARN_ON_ONCE(1);
4359                 return nfserr_rep_too_big_to_cache;
4360         }
4361         return nfserr_rep_too_big;
4362 }
4363 
4364 void
4365 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4366 {
4367         struct xdr_stream *xdr = &resp->xdr;
4368         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4369         struct svc_rqst *rqstp = resp->rqstp;
4370         const struct nfsd4_operation *opdesc = op->opdesc;
4371         int post_err_offset;
4372         nfsd4_enc encoder;
4373         __be32 *p;
4374 
4375         p = xdr_reserve_space(xdr, 8);
4376         if (!p) {
4377                 WARN_ON_ONCE(1);
4378                 return;
4379         }
4380         *p++ = cpu_to_be32(op->opnum);
4381         post_err_offset = xdr->buf->len;
4382 
4383         if (op->opnum == OP_ILLEGAL)
4384                 goto status;
4385         if (op->status && opdesc &&
4386                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4387                 goto status;
4388         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4389                !nfsd4_enc_ops[op->opnum]);
4390         encoder = nfsd4_enc_ops[op->opnum];
4391         op->status = encoder(resp, op->status, &op->u);
4392         if (opdesc && opdesc->op_release)
4393                 opdesc->op_release(&op->u);
4394         xdr_commit_encode(xdr);
4395 
4396         /* nfsd4_check_resp_size guarantees enough room for error status */
4397         if (!op->status) {
4398                 int space_needed = 0;
4399                 if (!nfsd4_last_compound_op(rqstp))
4400                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4401                 op->status = nfsd4_check_resp_size(resp, space_needed);
4402         }
4403         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4404                 struct nfsd4_slot *slot = resp->cstate.slot;
4405 
4406                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4407                         op->status = nfserr_rep_too_big_to_cache;
4408                 else
4409                         op->status = nfserr_rep_too_big;
4410         }
4411         if (op->status == nfserr_resource ||
4412             op->status == nfserr_rep_too_big ||
4413             op->status == nfserr_rep_too_big_to_cache) {
4414                 /*
4415                  * The operation may have already been encoded or
4416                  * partially encoded.  No op returns anything additional
4417                  * in the case of one of these three errors, so we can
4418                  * just truncate back to after the status.  But it's a
4419                  * bug if we had to do this on a non-idempotent op:
4420                  */
4421                 warn_on_nonidempotent_op(op);
4422                 xdr_truncate_encode(xdr, post_err_offset);
4423         }
4424         if (so) {
4425                 int len = xdr->buf->len - post_err_offset;
4426 
4427                 so->so_replay.rp_status = op->status;
4428                 so->so_replay.rp_buflen = len;
4429                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4430                                                 so->so_replay.rp_buf, len);
4431         }
4432 status:
4433         /* Note that op->status is already in network byte order: */
4434         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4435 }
4436 
4437 /* 
4438  * Encode the reply stored in the stateowner reply cache 
4439  * 
4440  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4441  * previously sent already encoded operation.
4442  */
4443 void
4444 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4445 {
4446         __be32 *p;
4447         struct nfs4_replay *rp = op->replay;
4448 
4449         BUG_ON(!rp);
4450 
4451         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4452         if (!p) {
4453                 WARN_ON_ONCE(1);
4454                 return;
4455         }
4456         *p++ = cpu_to_be32(op->opnum);
4457         *p++ = rp->rp_status;  /* already xdr'ed */
4458 
4459         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4460 }
4461 
4462 int
4463 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4464 {
4465         return xdr_ressize_check(rqstp, p);
4466 }
4467 
4468 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4469 {
4470         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4471 
4472         if (args->ops != args->iops) {
4473                 kfree(args->ops);
4474                 args->ops = args->iops;
4475         }
4476         kfree(args->tmpp);
4477         args->tmpp = NULL;
4478         while (args->to_free) {
4479                 struct svcxdr_tmpbuf *tb = args->to_free;
4480                 args->to_free = tb->next;
4481                 kfree(tb);
4482         }
4483 }
4484 
4485 int
4486 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4487 {
4488         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4489 
4490         if (rqstp->rq_arg.head[0].iov_len % 4) {
4491                 /* client is nuts */
4492                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4493                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4494                 return 0;
4495         }
4496         args->p = p;
4497         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4498         args->pagelist = rqstp->rq_arg.pages;
4499         args->pagelen = rqstp->rq_arg.page_len;
4500         args->tail = false;
4501         args->tmpp = NULL;
4502         args->to_free = NULL;
4503         args->ops = args->iops;
4504         args->rqstp = rqstp;
4505 
4506         return !nfsd4_decode_compound(args);
4507 }
4508 
4509 int
4510 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4511 {
4512         /*
4513          * All that remains is to write the tag and operation count...
4514          */
4515         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4516         struct xdr_buf *buf = resp->xdr.buf;
4517 
4518         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4519                                  buf->tail[0].iov_len);
4520 
4521         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4522 
4523         p = resp->tagp;
4524         *p++ = htonl(resp->taglen);
4525         memcpy(p, resp->tag, resp->taglen);
4526         p += XDR_QUADLEN(resp->taglen);
4527         *p++ = htonl(resp->opcnt);
4528 
4529         nfsd4_sequence_done(resp);
4530         return 1;
4531 }
4532 
4533 /*
4534  * Local variables:
4535  *  c-basic-offset: 8
4536  * End:
4537  */
4538 

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