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

Version: ~ [ linux-5.0-rc6 ] ~ [ linux-4.20.10 ] ~ [ linux-4.19.23 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.101 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.158 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.174 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.134 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  Server-side XDR for NFSv4
  3  *
  4  *  Copyright (c) 2002 The Regents of the University of Michigan.
  5  *  All rights reserved.
  6  *
  7  *  Kendrick Smith <kmsmith@umich.edu>
  8  *  Andy Adamson   <andros@umich.edu>
  9  *
 10  *  Redistribution and use in source and binary forms, with or without
 11  *  modification, are permitted provided that the following conditions
 12  *  are met:
 13  *
 14  *  1. Redistributions of source code must retain the above copyright
 15  *     notice, this list of conditions and the following disclaimer.
 16  *  2. Redistributions in binary form must reproduce the above copyright
 17  *     notice, this list of conditions and the following disclaimer in the
 18  *     documentation and/or other materials provided with the distribution.
 19  *  3. Neither the name of the University nor the names of its
 20  *     contributors may be used to endorse or promote products derived
 21  *     from this software without specific prior written permission.
 22  *
 23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 34  */
 35 
 36 #include <linux/file.h>
 37 #include <linux/slab.h>
 38 #include <linux/namei.h>
 39 #include <linux/statfs.h>
 40 #include <linux/utsname.h>
 41 #include <linux/pagemap.h>
 42 #include <linux/sunrpc/svcauth_gss.h>
 43 
 44 #include "idmap.h"
 45 #include "acl.h"
 46 #include "xdr4.h"
 47 #include "vfs.h"
 48 #include "state.h"
 49 #include "cache.h"
 50 #include "netns.h"
 51 #include "pnfs.h"
 52 
 53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 54 #include <linux/security.h>
 55 #endif
 56 
 57 
 58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
 59 
 60 const u32 nfsd_suppattrs[3][3] = {
 61         {NFSD4_SUPPORTED_ATTRS_WORD0,
 62          NFSD4_SUPPORTED_ATTRS_WORD1,
 63          NFSD4_SUPPORTED_ATTRS_WORD2},
 64 
 65         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
 66          NFSD4_1_SUPPORTED_ATTRS_WORD1,
 67          NFSD4_1_SUPPORTED_ATTRS_WORD2},
 68 
 69         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
 70          NFSD4_1_SUPPORTED_ATTRS_WORD1,
 71          NFSD4_2_SUPPORTED_ATTRS_WORD2},
 72 };
 73 
 74 /*
 75  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
 76  * directory in order to indicate to the client that a filesystem boundary is present
 77  * We use a fixed fsid for a referral
 78  */
 79 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
 80 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
 81 
 82 static __be32
 83 check_filename(char *str, int len)
 84 {
 85         int i;
 86 
 87         if (len == 0)
 88                 return nfserr_inval;
 89         if (isdotent(str, len))
 90                 return nfserr_badname;
 91         for (i = 0; i < len; i++)
 92                 if (str[i] == '/')
 93                         return nfserr_badname;
 94         return 0;
 95 }
 96 
 97 #define DECODE_HEAD                             \
 98         __be32 *p;                              \
 99         __be32 status
100 #define DECODE_TAIL                             \
101         status = 0;                             \
102 out:                                            \
103         return status;                          \
104 xdr_error:                                      \
105         dprintk("NFSD: xdr error (%s:%d)\n",    \
106                         __FILE__, __LINE__);    \
107         status = nfserr_bad_xdr;                \
108         goto out
109 
110 #define READMEM(x,nbytes) do {                  \
111         x = (char *)p;                          \
112         p += XDR_QUADLEN(nbytes);               \
113 } while (0)
114 #define SAVEMEM(x,nbytes) do {                  \
115         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
116                 savemem(argp, p, nbytes) :      \
117                 (char *)p)) {                   \
118                 dprintk("NFSD: xdr error (%s:%d)\n", \
119                                 __FILE__, __LINE__); \
120                 goto xdr_error;                 \
121                 }                               \
122         p += XDR_QUADLEN(nbytes);               \
123 } while (0)
124 #define COPYMEM(x,nbytes) do {                  \
125         memcpy((x), p, nbytes);                 \
126         p += XDR_QUADLEN(nbytes);               \
127 } while (0)
128 
129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
130 #define READ_BUF(nbytes)  do {                  \
131         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
132                 p = argp->p;                    \
133                 argp->p += XDR_QUADLEN(nbytes); \
134         } else if (!(p = read_buf(argp, nbytes))) { \
135                 dprintk("NFSD: xdr error (%s:%d)\n", \
136                                 __FILE__, __LINE__); \
137                 goto xdr_error;                 \
138         }                                       \
139 } while (0)
140 
141 static void next_decode_page(struct nfsd4_compoundargs *argp)
142 {
143         argp->p = page_address(argp->pagelist[0]);
144         argp->pagelist++;
145         if (argp->pagelen < PAGE_SIZE) {
146                 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
147                 argp->pagelen = 0;
148         } else {
149                 argp->end = argp->p + (PAGE_SIZE>>2);
150                 argp->pagelen -= PAGE_SIZE;
151         }
152 }
153 
154 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
155 {
156         /* We want more bytes than seem to be available.
157          * Maybe we need a new page, maybe we have just run out
158          */
159         unsigned int avail = (char *)argp->end - (char *)argp->p;
160         __be32 *p;
161 
162         if (argp->pagelen == 0) {
163                 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
164 
165                 if (!argp->tail) {
166                         argp->tail = true;
167                         avail = vec->iov_len;
168                         argp->p = vec->iov_base;
169                         argp->end = vec->iov_base + avail;
170                 }
171 
172                 if (avail < nbytes)
173                         return NULL;
174 
175                 p = argp->p;
176                 argp->p += XDR_QUADLEN(nbytes);
177                 return p;
178         }
179 
180         if (avail + argp->pagelen < nbytes)
181                 return NULL;
182         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
183                 return NULL;
184         /* ok, we can do it with the current plus the next page */
185         if (nbytes <= sizeof(argp->tmp))
186                 p = argp->tmp;
187         else {
188                 kfree(argp->tmpp);
189                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
190                 if (!p)
191                         return NULL;
192                 
193         }
194         /*
195          * The following memcpy is safe because read_buf is always
196          * called with nbytes > avail, and the two cases above both
197          * guarantee p points to at least nbytes bytes.
198          */
199         memcpy(p, argp->p, avail);
200         next_decode_page(argp);
201         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
202         argp->p += XDR_QUADLEN(nbytes - avail);
203         return p;
204 }
205 
206 static int zero_clientid(clientid_t *clid)
207 {
208         return (clid->cl_boot == 0) && (clid->cl_id == 0);
209 }
210 
211 /**
212  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
213  * @argp: NFSv4 compound argument structure
214  * @p: pointer to be freed (with kfree())
215  *
216  * Marks @p to be freed when processing the compound operation
217  * described in @argp finishes.
218  */
219 static void *
220 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
221 {
222         struct svcxdr_tmpbuf *tb;
223 
224         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
225         if (!tb)
226                 return NULL;
227         tb->next = argp->to_free;
228         argp->to_free = tb;
229         return tb->buf;
230 }
231 
232 /*
233  * For xdr strings that need to be passed to other kernel api's
234  * as null-terminated strings.
235  *
236  * Note null-terminating in place usually isn't safe since the
237  * buffer might end on a page boundary.
238  */
239 static char *
240 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
241 {
242         char *p = svcxdr_tmpalloc(argp, len + 1);
243 
244         if (!p)
245                 return NULL;
246         memcpy(p, buf, len);
247         p[len] = '\0';
248         return p;
249 }
250 
251 /**
252  * savemem - duplicate a chunk of memory for later processing
253  * @argp: NFSv4 compound argument structure to be freed with
254  * @p: pointer to be duplicated
255  * @nbytes: length to be duplicated
256  *
257  * Returns a pointer to a copy of @nbytes bytes of memory at @p
258  * that are preserved until processing of the NFSv4 compound
259  * operation described by @argp finishes.
260  */
261 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
262 {
263         void *ret;
264 
265         ret = svcxdr_tmpalloc(argp, nbytes);
266         if (!ret)
267                 return NULL;
268         memcpy(ret, p, nbytes);
269         return ret;
270 }
271 
272 /*
273  * We require the high 32 bits of 'seconds' to be 0, and
274  * we ignore all 32 bits of 'nseconds'.
275  */
276 static __be32
277 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
278 {
279         DECODE_HEAD;
280         u64 sec;
281 
282         READ_BUF(12);
283         p = xdr_decode_hyper(p, &sec);
284         tv->tv_sec = sec;
285         tv->tv_nsec = be32_to_cpup(p++);
286         if (tv->tv_nsec >= (u32)1000000000)
287                 return nfserr_inval;
288 
289         DECODE_TAIL;
290 }
291 
292 static __be32
293 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
294 {
295         u32 bmlen;
296         DECODE_HEAD;
297 
298         bmval[0] = 0;
299         bmval[1] = 0;
300         bmval[2] = 0;
301 
302         READ_BUF(4);
303         bmlen = be32_to_cpup(p++);
304         if (bmlen > 1000)
305                 goto xdr_error;
306 
307         READ_BUF(bmlen << 2);
308         if (bmlen > 0)
309                 bmval[0] = be32_to_cpup(p++);
310         if (bmlen > 1)
311                 bmval[1] = be32_to_cpup(p++);
312         if (bmlen > 2)
313                 bmval[2] = be32_to_cpup(p++);
314 
315         DECODE_TAIL;
316 }
317 
318 static __be32
319 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
320                    struct iattr *iattr, struct nfs4_acl **acl,
321                    struct xdr_netobj *label, int *umask)
322 {
323         struct timespec ts;
324         int expected_len, len = 0;
325         u32 dummy32;
326         char *buf;
327 
328         DECODE_HEAD;
329         iattr->ia_valid = 0;
330         if ((status = nfsd4_decode_bitmap(argp, bmval)))
331                 return status;
332 
333         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
334             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
335             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
336                 if (nfsd_attrs_supported(argp->minorversion, bmval))
337                         return nfserr_inval;
338                 return nfserr_attrnotsupp;
339         }
340 
341         READ_BUF(4);
342         expected_len = be32_to_cpup(p++);
343 
344         if (bmval[0] & FATTR4_WORD0_SIZE) {
345                 READ_BUF(8);
346                 len += 8;
347                 p = xdr_decode_hyper(p, &iattr->ia_size);
348                 iattr->ia_valid |= ATTR_SIZE;
349         }
350         if (bmval[0] & FATTR4_WORD0_ACL) {
351                 u32 nace;
352                 struct nfs4_ace *ace;
353 
354                 READ_BUF(4); len += 4;
355                 nace = be32_to_cpup(p++);
356 
357                 if (nace > NFS4_ACL_MAX)
358                         return nfserr_fbig;
359 
360                 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
361                 if (*acl == NULL)
362                         return nfserr_jukebox;
363 
364                 (*acl)->naces = nace;
365                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
366                         READ_BUF(16); len += 16;
367                         ace->type = be32_to_cpup(p++);
368                         ace->flag = be32_to_cpup(p++);
369                         ace->access_mask = be32_to_cpup(p++);
370                         dummy32 = be32_to_cpup(p++);
371                         READ_BUF(dummy32);
372                         len += XDR_QUADLEN(dummy32) << 2;
373                         READMEM(buf, dummy32);
374                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
375                         status = nfs_ok;
376                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
377                                 ;
378                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
379                                 status = nfsd_map_name_to_gid(argp->rqstp,
380                                                 buf, dummy32, &ace->who_gid);
381                         else
382                                 status = nfsd_map_name_to_uid(argp->rqstp,
383                                                 buf, dummy32, &ace->who_uid);
384                         if (status)
385                                 return status;
386                 }
387         } else
388                 *acl = NULL;
389         if (bmval[1] & FATTR4_WORD1_MODE) {
390                 READ_BUF(4);
391                 len += 4;
392                 iattr->ia_mode = be32_to_cpup(p++);
393                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
394                 iattr->ia_valid |= ATTR_MODE;
395         }
396         if (bmval[1] & FATTR4_WORD1_OWNER) {
397                 READ_BUF(4);
398                 len += 4;
399                 dummy32 = be32_to_cpup(p++);
400                 READ_BUF(dummy32);
401                 len += (XDR_QUADLEN(dummy32) << 2);
402                 READMEM(buf, dummy32);
403                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
404                         return status;
405                 iattr->ia_valid |= ATTR_UID;
406         }
407         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
408                 READ_BUF(4);
409                 len += 4;
410                 dummy32 = be32_to_cpup(p++);
411                 READ_BUF(dummy32);
412                 len += (XDR_QUADLEN(dummy32) << 2);
413                 READMEM(buf, dummy32);
414                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
415                         return status;
416                 iattr->ia_valid |= ATTR_GID;
417         }
418         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
419                 READ_BUF(4);
420                 len += 4;
421                 dummy32 = be32_to_cpup(p++);
422                 switch (dummy32) {
423                 case NFS4_SET_TO_CLIENT_TIME:
424                         len += 12;
425                         status = nfsd4_decode_time(argp, &ts);
426                         iattr->ia_atime = timespec_to_timespec64(ts);
427                         if (status)
428                                 return status;
429                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
430                         break;
431                 case NFS4_SET_TO_SERVER_TIME:
432                         iattr->ia_valid |= ATTR_ATIME;
433                         break;
434                 default:
435                         goto xdr_error;
436                 }
437         }
438         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
439                 READ_BUF(4);
440                 len += 4;
441                 dummy32 = be32_to_cpup(p++);
442                 switch (dummy32) {
443                 case NFS4_SET_TO_CLIENT_TIME:
444                         len += 12;
445                         status = nfsd4_decode_time(argp, &ts);
446                         iattr->ia_mtime = timespec_to_timespec64(ts);
447                         if (status)
448                                 return status;
449                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
450                         break;
451                 case NFS4_SET_TO_SERVER_TIME:
452                         iattr->ia_valid |= ATTR_MTIME;
453                         break;
454                 default:
455                         goto xdr_error;
456                 }
457         }
458 
459         label->len = 0;
460         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
461             bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
462                 READ_BUF(4);
463                 len += 4;
464                 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
465                 READ_BUF(4);
466                 len += 4;
467                 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
468                 READ_BUF(4);
469                 len += 4;
470                 dummy32 = be32_to_cpup(p++);
471                 READ_BUF(dummy32);
472                 if (dummy32 > NFS4_MAXLABELLEN)
473                         return nfserr_badlabel;
474                 len += (XDR_QUADLEN(dummy32) << 2);
475                 READMEM(buf, dummy32);
476                 label->len = dummy32;
477                 label->data = svcxdr_dupstr(argp, buf, dummy32);
478                 if (!label->data)
479                         return nfserr_jukebox;
480         }
481         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
482                 if (!umask)
483                         goto xdr_error;
484                 READ_BUF(8);
485                 len += 8;
486                 dummy32 = be32_to_cpup(p++);
487                 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
488                 dummy32 = be32_to_cpup(p++);
489                 *umask = dummy32 & S_IRWXUGO;
490                 iattr->ia_valid |= ATTR_MODE;
491         }
492         if (len != expected_len)
493                 goto xdr_error;
494 
495         DECODE_TAIL;
496 }
497 
498 static __be32
499 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
500 {
501         DECODE_HEAD;
502 
503         READ_BUF(sizeof(stateid_t));
504         sid->si_generation = be32_to_cpup(p++);
505         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
506 
507         DECODE_TAIL;
508 }
509 
510 static __be32
511 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
512 {
513         DECODE_HEAD;
514 
515         READ_BUF(4);
516         access->ac_req_access = be32_to_cpup(p++);
517 
518         DECODE_TAIL;
519 }
520 
521 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
522 {
523         DECODE_HEAD;
524         u32 dummy, uid, gid;
525         char *machine_name;
526         int i;
527         int nr_secflavs;
528 
529         /* callback_sec_params4 */
530         READ_BUF(4);
531         nr_secflavs = be32_to_cpup(p++);
532         if (nr_secflavs)
533                 cbs->flavor = (u32)(-1);
534         else
535                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
536                 cbs->flavor = 0;
537         for (i = 0; i < nr_secflavs; ++i) {
538                 READ_BUF(4);
539                 dummy = be32_to_cpup(p++);
540                 switch (dummy) {
541                 case RPC_AUTH_NULL:
542                         /* Nothing to read */
543                         if (cbs->flavor == (u32)(-1))
544                                 cbs->flavor = RPC_AUTH_NULL;
545                         break;
546                 case RPC_AUTH_UNIX:
547                         READ_BUF(8);
548                         /* stamp */
549                         dummy = be32_to_cpup(p++);
550 
551                         /* machine name */
552                         dummy = be32_to_cpup(p++);
553                         READ_BUF(dummy);
554                         SAVEMEM(machine_name, dummy);
555 
556                         /* uid, gid */
557                         READ_BUF(8);
558                         uid = be32_to_cpup(p++);
559                         gid = be32_to_cpup(p++);
560 
561                         /* more gids */
562                         READ_BUF(4);
563                         dummy = be32_to_cpup(p++);
564                         READ_BUF(dummy * 4);
565                         if (cbs->flavor == (u32)(-1)) {
566                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
567                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
568                                 if (uid_valid(kuid) && gid_valid(kgid)) {
569                                         cbs->uid = kuid;
570                                         cbs->gid = kgid;
571                                         cbs->flavor = RPC_AUTH_UNIX;
572                                 } else {
573                                         dprintk("RPC_AUTH_UNIX with invalid"
574                                                 "uid or gid ignoring!\n");
575                                 }
576                         }
577                         break;
578                 case RPC_AUTH_GSS:
579                         dprintk("RPC_AUTH_GSS callback secflavor "
580                                 "not supported!\n");
581                         READ_BUF(8);
582                         /* gcbp_service */
583                         dummy = be32_to_cpup(p++);
584                         /* gcbp_handle_from_server */
585                         dummy = be32_to_cpup(p++);
586                         READ_BUF(dummy);
587                         p += XDR_QUADLEN(dummy);
588                         /* gcbp_handle_from_client */
589                         READ_BUF(4);
590                         dummy = be32_to_cpup(p++);
591                         READ_BUF(dummy);
592                         break;
593                 default:
594                         dprintk("Illegal callback secflavor\n");
595                         return nfserr_inval;
596                 }
597         }
598         DECODE_TAIL;
599 }
600 
601 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
602 {
603         DECODE_HEAD;
604 
605         READ_BUF(4);
606         bc->bc_cb_program = be32_to_cpup(p++);
607         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
608 
609         DECODE_TAIL;
610 }
611 
612 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
613 {
614         DECODE_HEAD;
615 
616         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
617         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
618         bcts->dir = be32_to_cpup(p++);
619         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
620          * could help us figure out we should be using it. */
621         DECODE_TAIL;
622 }
623 
624 static __be32
625 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
626 {
627         DECODE_HEAD;
628 
629         READ_BUF(4);
630         close->cl_seqid = be32_to_cpup(p++);
631         return nfsd4_decode_stateid(argp, &close->cl_stateid);
632 
633         DECODE_TAIL;
634 }
635 
636 
637 static __be32
638 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
639 {
640         DECODE_HEAD;
641 
642         READ_BUF(12);
643         p = xdr_decode_hyper(p, &commit->co_offset);
644         commit->co_count = be32_to_cpup(p++);
645 
646         DECODE_TAIL;
647 }
648 
649 static __be32
650 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
651 {
652         DECODE_HEAD;
653 
654         READ_BUF(4);
655         create->cr_type = be32_to_cpup(p++);
656         switch (create->cr_type) {
657         case NF4LNK:
658                 READ_BUF(4);
659                 create->cr_datalen = be32_to_cpup(p++);
660                 READ_BUF(create->cr_datalen);
661                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
662                 if (!create->cr_data)
663                         return nfserr_jukebox;
664                 break;
665         case NF4BLK:
666         case NF4CHR:
667                 READ_BUF(8);
668                 create->cr_specdata1 = be32_to_cpup(p++);
669                 create->cr_specdata2 = be32_to_cpup(p++);
670                 break;
671         case NF4SOCK:
672         case NF4FIFO:
673         case NF4DIR:
674         default:
675                 break;
676         }
677 
678         READ_BUF(4);
679         create->cr_namelen = be32_to_cpup(p++);
680         READ_BUF(create->cr_namelen);
681         SAVEMEM(create->cr_name, create->cr_namelen);
682         if ((status = check_filename(create->cr_name, create->cr_namelen)))
683                 return status;
684 
685         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
686                                     &create->cr_acl, &create->cr_label,
687                                     &create->cr_umask);
688         if (status)
689                 goto out;
690 
691         DECODE_TAIL;
692 }
693 
694 static inline __be32
695 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
696 {
697         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
698 }
699 
700 static inline __be32
701 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
702 {
703         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
704 }
705 
706 static __be32
707 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
708 {
709         DECODE_HEAD;
710 
711         READ_BUF(4);
712         link->li_namelen = be32_to_cpup(p++);
713         READ_BUF(link->li_namelen);
714         SAVEMEM(link->li_name, link->li_namelen);
715         if ((status = check_filename(link->li_name, link->li_namelen)))
716                 return status;
717 
718         DECODE_TAIL;
719 }
720 
721 static __be32
722 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
723 {
724         DECODE_HEAD;
725 
726         /*
727         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
728         */
729         READ_BUF(28);
730         lock->lk_type = be32_to_cpup(p++);
731         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
732                 goto xdr_error;
733         lock->lk_reclaim = be32_to_cpup(p++);
734         p = xdr_decode_hyper(p, &lock->lk_offset);
735         p = xdr_decode_hyper(p, &lock->lk_length);
736         lock->lk_is_new = be32_to_cpup(p++);
737 
738         if (lock->lk_is_new) {
739                 READ_BUF(4);
740                 lock->lk_new_open_seqid = be32_to_cpup(p++);
741                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
742                 if (status)
743                         return status;
744                 READ_BUF(8 + sizeof(clientid_t));
745                 lock->lk_new_lock_seqid = be32_to_cpup(p++);
746                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
747                 lock->lk_new_owner.len = be32_to_cpup(p++);
748                 READ_BUF(lock->lk_new_owner.len);
749                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
750         } else {
751                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
752                 if (status)
753                         return status;
754                 READ_BUF(4);
755                 lock->lk_old_lock_seqid = be32_to_cpup(p++);
756         }
757 
758         DECODE_TAIL;
759 }
760 
761 static __be32
762 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
763 {
764         DECODE_HEAD;
765                         
766         READ_BUF(32);
767         lockt->lt_type = be32_to_cpup(p++);
768         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
769                 goto xdr_error;
770         p = xdr_decode_hyper(p, &lockt->lt_offset);
771         p = xdr_decode_hyper(p, &lockt->lt_length);
772         COPYMEM(&lockt->lt_clientid, 8);
773         lockt->lt_owner.len = be32_to_cpup(p++);
774         READ_BUF(lockt->lt_owner.len);
775         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
776 
777         DECODE_TAIL;
778 }
779 
780 static __be32
781 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
782 {
783         DECODE_HEAD;
784 
785         READ_BUF(8);
786         locku->lu_type = be32_to_cpup(p++);
787         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
788                 goto xdr_error;
789         locku->lu_seqid = be32_to_cpup(p++);
790         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
791         if (status)
792                 return status;
793         READ_BUF(16);
794         p = xdr_decode_hyper(p, &locku->lu_offset);
795         p = xdr_decode_hyper(p, &locku->lu_length);
796 
797         DECODE_TAIL;
798 }
799 
800 static __be32
801 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
802 {
803         DECODE_HEAD;
804 
805         READ_BUF(4);
806         lookup->lo_len = be32_to_cpup(p++);
807         READ_BUF(lookup->lo_len);
808         SAVEMEM(lookup->lo_name, lookup->lo_len);
809         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
810                 return status;
811 
812         DECODE_TAIL;
813 }
814 
815 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
816 {
817         __be32 *p;
818         u32 w;
819 
820         READ_BUF(4);
821         w = be32_to_cpup(p++);
822         *share_access = w & NFS4_SHARE_ACCESS_MASK;
823         *deleg_want = w & NFS4_SHARE_WANT_MASK;
824         if (deleg_when)
825                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
826 
827         switch (w & NFS4_SHARE_ACCESS_MASK) {
828         case NFS4_SHARE_ACCESS_READ:
829         case NFS4_SHARE_ACCESS_WRITE:
830         case NFS4_SHARE_ACCESS_BOTH:
831                 break;
832         default:
833                 return nfserr_bad_xdr;
834         }
835         w &= ~NFS4_SHARE_ACCESS_MASK;
836         if (!w)
837                 return nfs_ok;
838         if (!argp->minorversion)
839                 return nfserr_bad_xdr;
840         switch (w & NFS4_SHARE_WANT_MASK) {
841         case NFS4_SHARE_WANT_NO_PREFERENCE:
842         case NFS4_SHARE_WANT_READ_DELEG:
843         case NFS4_SHARE_WANT_WRITE_DELEG:
844         case NFS4_SHARE_WANT_ANY_DELEG:
845         case NFS4_SHARE_WANT_NO_DELEG:
846         case NFS4_SHARE_WANT_CANCEL:
847                 break;
848         default:
849                 return nfserr_bad_xdr;
850         }
851         w &= ~NFS4_SHARE_WANT_MASK;
852         if (!w)
853                 return nfs_ok;
854 
855         if (!deleg_when)        /* open_downgrade */
856                 return nfserr_inval;
857         switch (w) {
858         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
859         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
860         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
861               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
862                 return nfs_ok;
863         }
864 xdr_error:
865         return nfserr_bad_xdr;
866 }
867 
868 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
869 {
870         __be32 *p;
871 
872         READ_BUF(4);
873         *x = be32_to_cpup(p++);
874         /* Note: unlinke access bits, deny bits may be zero. */
875         if (*x & ~NFS4_SHARE_DENY_BOTH)
876                 return nfserr_bad_xdr;
877         return nfs_ok;
878 xdr_error:
879         return nfserr_bad_xdr;
880 }
881 
882 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
883 {
884         __be32 *p;
885 
886         READ_BUF(4);
887         o->len = be32_to_cpup(p++);
888 
889         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
890                 return nfserr_bad_xdr;
891 
892         READ_BUF(o->len);
893         SAVEMEM(o->data, o->len);
894         return nfs_ok;
895 xdr_error:
896         return nfserr_bad_xdr;
897 }
898 
899 static __be32
900 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
901 {
902         DECODE_HEAD;
903         u32 dummy;
904 
905         memset(open->op_bmval, 0, sizeof(open->op_bmval));
906         open->op_iattr.ia_valid = 0;
907         open->op_openowner = NULL;
908 
909         open->op_xdr_error = 0;
910         /* seqid, share_access, share_deny, clientid, ownerlen */
911         READ_BUF(4);
912         open->op_seqid = be32_to_cpup(p++);
913         /* decode, yet ignore deleg_when until supported */
914         status = nfsd4_decode_share_access(argp, &open->op_share_access,
915                                            &open->op_deleg_want, &dummy);
916         if (status)
917                 goto xdr_error;
918         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
919         if (status)
920                 goto xdr_error;
921         READ_BUF(sizeof(clientid_t));
922         COPYMEM(&open->op_clientid, sizeof(clientid_t));
923         status = nfsd4_decode_opaque(argp, &open->op_owner);
924         if (status)
925                 goto xdr_error;
926         READ_BUF(4);
927         open->op_create = be32_to_cpup(p++);
928         switch (open->op_create) {
929         case NFS4_OPEN_NOCREATE:
930                 break;
931         case NFS4_OPEN_CREATE:
932                 READ_BUF(4);
933                 open->op_createmode = be32_to_cpup(p++);
934                 switch (open->op_createmode) {
935                 case NFS4_CREATE_UNCHECKED:
936                 case NFS4_CREATE_GUARDED:
937                         status = nfsd4_decode_fattr(argp, open->op_bmval,
938                                 &open->op_iattr, &open->op_acl, &open->op_label,
939                                 &open->op_umask);
940                         if (status)
941                                 goto out;
942                         break;
943                 case NFS4_CREATE_EXCLUSIVE:
944                         READ_BUF(NFS4_VERIFIER_SIZE);
945                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
946                         break;
947                 case NFS4_CREATE_EXCLUSIVE4_1:
948                         if (argp->minorversion < 1)
949                                 goto xdr_error;
950                         READ_BUF(NFS4_VERIFIER_SIZE);
951                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
952                         status = nfsd4_decode_fattr(argp, open->op_bmval,
953                                 &open->op_iattr, &open->op_acl, &open->op_label,
954                                 &open->op_umask);
955                         if (status)
956                                 goto out;
957                         break;
958                 default:
959                         goto xdr_error;
960                 }
961                 break;
962         default:
963                 goto xdr_error;
964         }
965 
966         /* open_claim */
967         READ_BUF(4);
968         open->op_claim_type = be32_to_cpup(p++);
969         switch (open->op_claim_type) {
970         case NFS4_OPEN_CLAIM_NULL:
971         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
972                 READ_BUF(4);
973                 open->op_fname.len = be32_to_cpup(p++);
974                 READ_BUF(open->op_fname.len);
975                 SAVEMEM(open->op_fname.data, open->op_fname.len);
976                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
977                         return status;
978                 break;
979         case NFS4_OPEN_CLAIM_PREVIOUS:
980                 READ_BUF(4);
981                 open->op_delegate_type = be32_to_cpup(p++);
982                 break;
983         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
984                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
985                 if (status)
986                         return status;
987                 READ_BUF(4);
988                 open->op_fname.len = be32_to_cpup(p++);
989                 READ_BUF(open->op_fname.len);
990                 SAVEMEM(open->op_fname.data, open->op_fname.len);
991                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
992                         return status;
993                 break;
994         case NFS4_OPEN_CLAIM_FH:
995         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
996                 if (argp->minorversion < 1)
997                         goto xdr_error;
998                 /* void */
999                 break;
1000         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1001                 if (argp->minorversion < 1)
1002                         goto xdr_error;
1003                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1004                 if (status)
1005                         return status;
1006                 break;
1007         default:
1008                 goto xdr_error;
1009         }
1010 
1011         DECODE_TAIL;
1012 }
1013 
1014 static __be32
1015 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1016 {
1017         DECODE_HEAD;
1018 
1019         if (argp->minorversion >= 1)
1020                 return nfserr_notsupp;
1021 
1022         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1023         if (status)
1024                 return status;
1025         READ_BUF(4);
1026         open_conf->oc_seqid = be32_to_cpup(p++);
1027 
1028         DECODE_TAIL;
1029 }
1030 
1031 static __be32
1032 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1033 {
1034         DECODE_HEAD;
1035                     
1036         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1037         if (status)
1038                 return status;
1039         READ_BUF(4);
1040         open_down->od_seqid = be32_to_cpup(p++);
1041         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1042                                            &open_down->od_deleg_want, NULL);
1043         if (status)
1044                 return status;
1045         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1046         if (status)
1047                 return status;
1048         DECODE_TAIL;
1049 }
1050 
1051 static __be32
1052 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1053 {
1054         DECODE_HEAD;
1055 
1056         READ_BUF(4);
1057         putfh->pf_fhlen = be32_to_cpup(p++);
1058         if (putfh->pf_fhlen > NFS4_FHSIZE)
1059                 goto xdr_error;
1060         READ_BUF(putfh->pf_fhlen);
1061         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1062 
1063         DECODE_TAIL;
1064 }
1065 
1066 static __be32
1067 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1068 {
1069         if (argp->minorversion == 0)
1070                 return nfs_ok;
1071         return nfserr_notsupp;
1072 }
1073 
1074 static __be32
1075 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1076 {
1077         DECODE_HEAD;
1078 
1079         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1080         if (status)
1081                 return status;
1082         READ_BUF(12);
1083         p = xdr_decode_hyper(p, &read->rd_offset);
1084         read->rd_length = be32_to_cpup(p++);
1085 
1086         DECODE_TAIL;
1087 }
1088 
1089 static __be32
1090 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1091 {
1092         DECODE_HEAD;
1093 
1094         READ_BUF(24);
1095         p = xdr_decode_hyper(p, &readdir->rd_cookie);
1096         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1097         readdir->rd_dircount = be32_to_cpup(p++);
1098         readdir->rd_maxcount = be32_to_cpup(p++);
1099         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1100                 goto out;
1101 
1102         DECODE_TAIL;
1103 }
1104 
1105 static __be32
1106 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1107 {
1108         DECODE_HEAD;
1109 
1110         READ_BUF(4);
1111         remove->rm_namelen = be32_to_cpup(p++);
1112         READ_BUF(remove->rm_namelen);
1113         SAVEMEM(remove->rm_name, remove->rm_namelen);
1114         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1115                 return status;
1116 
1117         DECODE_TAIL;
1118 }
1119 
1120 static __be32
1121 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1122 {
1123         DECODE_HEAD;
1124 
1125         READ_BUF(4);
1126         rename->rn_snamelen = be32_to_cpup(p++);
1127         READ_BUF(rename->rn_snamelen);
1128         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1129         READ_BUF(4);
1130         rename->rn_tnamelen = be32_to_cpup(p++);
1131         READ_BUF(rename->rn_tnamelen);
1132         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1133         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1134                 return status;
1135         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1136                 return status;
1137 
1138         DECODE_TAIL;
1139 }
1140 
1141 static __be32
1142 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1143 {
1144         DECODE_HEAD;
1145 
1146         if (argp->minorversion >= 1)
1147                 return nfserr_notsupp;
1148 
1149         READ_BUF(sizeof(clientid_t));
1150         COPYMEM(clientid, sizeof(clientid_t));
1151 
1152         DECODE_TAIL;
1153 }
1154 
1155 static __be32
1156 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1157                      struct nfsd4_secinfo *secinfo)
1158 {
1159         DECODE_HEAD;
1160 
1161         READ_BUF(4);
1162         secinfo->si_namelen = be32_to_cpup(p++);
1163         READ_BUF(secinfo->si_namelen);
1164         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1165         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1166         if (status)
1167                 return status;
1168         DECODE_TAIL;
1169 }
1170 
1171 static __be32
1172 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1173                      struct nfsd4_secinfo_no_name *sin)
1174 {
1175         DECODE_HEAD;
1176 
1177         READ_BUF(4);
1178         sin->sin_style = be32_to_cpup(p++);
1179         DECODE_TAIL;
1180 }
1181 
1182 static __be32
1183 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1184 {
1185         __be32 status;
1186 
1187         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1188         if (status)
1189                 return status;
1190         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1191                                   &setattr->sa_acl, &setattr->sa_label, NULL);
1192 }
1193 
1194 static __be32
1195 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1196 {
1197         DECODE_HEAD;
1198 
1199         if (argp->minorversion >= 1)
1200                 return nfserr_notsupp;
1201 
1202         READ_BUF(NFS4_VERIFIER_SIZE);
1203         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1204 
1205         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1206         if (status)
1207                 return nfserr_bad_xdr;
1208         READ_BUF(8);
1209         setclientid->se_callback_prog = be32_to_cpup(p++);
1210         setclientid->se_callback_netid_len = be32_to_cpup(p++);
1211         READ_BUF(setclientid->se_callback_netid_len);
1212         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1213         READ_BUF(4);
1214         setclientid->se_callback_addr_len = be32_to_cpup(p++);
1215 
1216         READ_BUF(setclientid->se_callback_addr_len);
1217         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1218         READ_BUF(4);
1219         setclientid->se_callback_ident = be32_to_cpup(p++);
1220 
1221         DECODE_TAIL;
1222 }
1223 
1224 static __be32
1225 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1226 {
1227         DECODE_HEAD;
1228 
1229         if (argp->minorversion >= 1)
1230                 return nfserr_notsupp;
1231 
1232         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1233         COPYMEM(&scd_c->sc_clientid, 8);
1234         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1235 
1236         DECODE_TAIL;
1237 }
1238 
1239 /* Also used for NVERIFY */
1240 static __be32
1241 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1242 {
1243         DECODE_HEAD;
1244 
1245         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1246                 goto out;
1247 
1248         /* For convenience's sake, we compare raw xdr'd attributes in
1249          * nfsd4_proc_verify */
1250 
1251         READ_BUF(4);
1252         verify->ve_attrlen = be32_to_cpup(p++);
1253         READ_BUF(verify->ve_attrlen);
1254         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1255 
1256         DECODE_TAIL;
1257 }
1258 
1259 static __be32
1260 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1261 {
1262         int avail;
1263         int len;
1264         DECODE_HEAD;
1265 
1266         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1267         if (status)
1268                 return status;
1269         READ_BUF(16);
1270         p = xdr_decode_hyper(p, &write->wr_offset);
1271         write->wr_stable_how = be32_to_cpup(p++);
1272         if (write->wr_stable_how > NFS_FILE_SYNC)
1273                 goto xdr_error;
1274         write->wr_buflen = be32_to_cpup(p++);
1275 
1276         /* Sorry .. no magic macros for this.. *
1277          * READ_BUF(write->wr_buflen);
1278          * SAVEMEM(write->wr_buf, write->wr_buflen);
1279          */
1280         avail = (char*)argp->end - (char*)argp->p;
1281         if (avail + argp->pagelen < write->wr_buflen) {
1282                 dprintk("NFSD: xdr error (%s:%d)\n",
1283                                 __FILE__, __LINE__);
1284                 goto xdr_error;
1285         }
1286         write->wr_head.iov_base = p;
1287         write->wr_head.iov_len = avail;
1288         write->wr_pagelist = argp->pagelist;
1289 
1290         len = XDR_QUADLEN(write->wr_buflen) << 2;
1291         if (len >= avail) {
1292                 int pages;
1293 
1294                 len -= avail;
1295 
1296                 pages = len >> PAGE_SHIFT;
1297                 argp->pagelist += pages;
1298                 argp->pagelen -= pages * PAGE_SIZE;
1299                 len -= pages * PAGE_SIZE;
1300 
1301                 next_decode_page(argp);
1302         }
1303         argp->p += XDR_QUADLEN(len);
1304 
1305         DECODE_TAIL;
1306 }
1307 
1308 static __be32
1309 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1310 {
1311         DECODE_HEAD;
1312 
1313         if (argp->minorversion >= 1)
1314                 return nfserr_notsupp;
1315 
1316         READ_BUF(12);
1317         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1318         rlockowner->rl_owner.len = be32_to_cpup(p++);
1319         READ_BUF(rlockowner->rl_owner.len);
1320         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1321 
1322         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1323                 return nfserr_inval;
1324         DECODE_TAIL;
1325 }
1326 
1327 static __be32
1328 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1329                          struct nfsd4_exchange_id *exid)
1330 {
1331         int dummy, tmp;
1332         DECODE_HEAD;
1333 
1334         READ_BUF(NFS4_VERIFIER_SIZE);
1335         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1336 
1337         status = nfsd4_decode_opaque(argp, &exid->clname);
1338         if (status)
1339                 return nfserr_bad_xdr;
1340 
1341         READ_BUF(4);
1342         exid->flags = be32_to_cpup(p++);
1343 
1344         /* Ignore state_protect4_a */
1345         READ_BUF(4);
1346         exid->spa_how = be32_to_cpup(p++);
1347         switch (exid->spa_how) {
1348         case SP4_NONE:
1349                 break;
1350         case SP4_MACH_CRED:
1351                 /* spo_must_enforce */
1352                 status = nfsd4_decode_bitmap(argp,
1353                                         exid->spo_must_enforce);
1354                 if (status)
1355                         goto out;
1356                 /* spo_must_allow */
1357                 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1358                 if (status)
1359                         goto out;
1360                 break;
1361         case SP4_SSV:
1362                 /* ssp_ops */
1363                 READ_BUF(4);
1364                 dummy = be32_to_cpup(p++);
1365                 READ_BUF(dummy * 4);
1366                 p += dummy;
1367 
1368                 READ_BUF(4);
1369                 dummy = be32_to_cpup(p++);
1370                 READ_BUF(dummy * 4);
1371                 p += dummy;
1372 
1373                 /* ssp_hash_algs<> */
1374                 READ_BUF(4);
1375                 tmp = be32_to_cpup(p++);
1376                 while (tmp--) {
1377                         READ_BUF(4);
1378                         dummy = be32_to_cpup(p++);
1379                         READ_BUF(dummy);
1380                         p += XDR_QUADLEN(dummy);
1381                 }
1382 
1383                 /* ssp_encr_algs<> */
1384                 READ_BUF(4);
1385                 tmp = be32_to_cpup(p++);
1386                 while (tmp--) {
1387                         READ_BUF(4);
1388                         dummy = be32_to_cpup(p++);
1389                         READ_BUF(dummy);
1390                         p += XDR_QUADLEN(dummy);
1391                 }
1392 
1393                 /* ignore ssp_window and ssp_num_gss_handles: */
1394                 READ_BUF(8);
1395                 break;
1396         default:
1397                 goto xdr_error;
1398         }
1399 
1400         /* Ignore Implementation ID */
1401         READ_BUF(4);    /* nfs_impl_id4 array length */
1402         dummy = be32_to_cpup(p++);
1403 
1404         if (dummy > 1)
1405                 goto xdr_error;
1406 
1407         if (dummy == 1) {
1408                 /* nii_domain */
1409                 READ_BUF(4);
1410                 dummy = be32_to_cpup(p++);
1411                 READ_BUF(dummy);
1412                 p += XDR_QUADLEN(dummy);
1413 
1414                 /* nii_name */
1415                 READ_BUF(4);
1416                 dummy = be32_to_cpup(p++);
1417                 READ_BUF(dummy);
1418                 p += XDR_QUADLEN(dummy);
1419 
1420                 /* nii_date */
1421                 READ_BUF(12);
1422                 p += 3;
1423         }
1424         DECODE_TAIL;
1425 }
1426 
1427 static __be32
1428 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1429                             struct nfsd4_create_session *sess)
1430 {
1431         DECODE_HEAD;
1432         u32 dummy;
1433 
1434         READ_BUF(16);
1435         COPYMEM(&sess->clientid, 8);
1436         sess->seqid = be32_to_cpup(p++);
1437         sess->flags = be32_to_cpup(p++);
1438 
1439         /* Fore channel attrs */
1440         READ_BUF(28);
1441         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1442         sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1443         sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1444         sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1445         sess->fore_channel.maxops = be32_to_cpup(p++);
1446         sess->fore_channel.maxreqs = be32_to_cpup(p++);
1447         sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1448         if (sess->fore_channel.nr_rdma_attrs == 1) {
1449                 READ_BUF(4);
1450                 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1451         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1452                 dprintk("Too many fore channel attr bitmaps!\n");
1453                 goto xdr_error;
1454         }
1455 
1456         /* Back channel attrs */
1457         READ_BUF(28);
1458         dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1459         sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1460         sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1461         sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1462         sess->back_channel.maxops = be32_to_cpup(p++);
1463         sess->back_channel.maxreqs = be32_to_cpup(p++);
1464         sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1465         if (sess->back_channel.nr_rdma_attrs == 1) {
1466                 READ_BUF(4);
1467                 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1468         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1469                 dprintk("Too many back channel attr bitmaps!\n");
1470                 goto xdr_error;
1471         }
1472 
1473         READ_BUF(4);
1474         sess->callback_prog = be32_to_cpup(p++);
1475         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1476         DECODE_TAIL;
1477 }
1478 
1479 static __be32
1480 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1481                              struct nfsd4_destroy_session *destroy_session)
1482 {
1483         DECODE_HEAD;
1484         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1485         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1486 
1487         DECODE_TAIL;
1488 }
1489 
1490 static __be32
1491 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1492                           struct nfsd4_free_stateid *free_stateid)
1493 {
1494         DECODE_HEAD;
1495 
1496         READ_BUF(sizeof(stateid_t));
1497         free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1498         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1499 
1500         DECODE_TAIL;
1501 }
1502 
1503 static __be32
1504 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1505                       struct nfsd4_sequence *seq)
1506 {
1507         DECODE_HEAD;
1508 
1509         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1510         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1511         seq->seqid = be32_to_cpup(p++);
1512         seq->slotid = be32_to_cpup(p++);
1513         seq->maxslots = be32_to_cpup(p++);
1514         seq->cachethis = be32_to_cpup(p++);
1515 
1516         DECODE_TAIL;
1517 }
1518 
1519 static __be32
1520 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1521 {
1522         int i;
1523         __be32 *p, status;
1524         struct nfsd4_test_stateid_id *stateid;
1525 
1526         READ_BUF(4);
1527         test_stateid->ts_num_ids = ntohl(*p++);
1528 
1529         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1530 
1531         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1532                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1533                 if (!stateid) {
1534                         status = nfserrno(-ENOMEM);
1535                         goto out;
1536                 }
1537 
1538                 INIT_LIST_HEAD(&stateid->ts_id_list);
1539                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1540 
1541                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1542                 if (status)
1543                         goto out;
1544         }
1545 
1546         status = 0;
1547 out:
1548         return status;
1549 xdr_error:
1550         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1551         status = nfserr_bad_xdr;
1552         goto out;
1553 }
1554 
1555 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1556 {
1557         DECODE_HEAD;
1558 
1559         READ_BUF(8);
1560         COPYMEM(&dc->clientid, 8);
1561 
1562         DECODE_TAIL;
1563 }
1564 
1565 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1566 {
1567         DECODE_HEAD;
1568 
1569         READ_BUF(4);
1570         rc->rca_one_fs = be32_to_cpup(p++);
1571 
1572         DECODE_TAIL;
1573 }
1574 
1575 #ifdef CONFIG_NFSD_PNFS
1576 static __be32
1577 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1578                 struct nfsd4_getdeviceinfo *gdev)
1579 {
1580         DECODE_HEAD;
1581         u32 num, i;
1582 
1583         READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1584         COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1585         gdev->gd_layout_type = be32_to_cpup(p++);
1586         gdev->gd_maxcount = be32_to_cpup(p++);
1587         num = be32_to_cpup(p++);
1588         if (num) {
1589                 if (num > 1000)
1590                         goto xdr_error;
1591                 READ_BUF(4 * num);
1592                 gdev->gd_notify_types = be32_to_cpup(p++);
1593                 for (i = 1; i < num; i++) {
1594                         if (be32_to_cpup(p++)) {
1595                                 status = nfserr_inval;
1596                                 goto out;
1597                         }
1598                 }
1599         }
1600         DECODE_TAIL;
1601 }
1602 
1603 static __be32
1604 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1605                 struct nfsd4_layoutget *lgp)
1606 {
1607         DECODE_HEAD;
1608 
1609         READ_BUF(36);
1610         lgp->lg_signal = be32_to_cpup(p++);
1611         lgp->lg_layout_type = be32_to_cpup(p++);
1612         lgp->lg_seg.iomode = be32_to_cpup(p++);
1613         p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1614         p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1615         p = xdr_decode_hyper(p, &lgp->lg_minlength);
1616 
1617         status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1618         if (status)
1619                 return status;
1620 
1621         READ_BUF(4);
1622         lgp->lg_maxcount = be32_to_cpup(p++);
1623 
1624         DECODE_TAIL;
1625 }
1626 
1627 static __be32
1628 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1629                 struct nfsd4_layoutcommit *lcp)
1630 {
1631         DECODE_HEAD;
1632         u32 timechange;
1633 
1634         READ_BUF(20);
1635         p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1636         p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1637         lcp->lc_reclaim = be32_to_cpup(p++);
1638 
1639         status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1640         if (status)
1641                 return status;
1642 
1643         READ_BUF(4);
1644         lcp->lc_newoffset = be32_to_cpup(p++);
1645         if (lcp->lc_newoffset) {
1646                 READ_BUF(8);
1647                 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1648         } else
1649                 lcp->lc_last_wr = 0;
1650         READ_BUF(4);
1651         timechange = be32_to_cpup(p++);
1652         if (timechange) {
1653                 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1654                 if (status)
1655                         return status;
1656         } else {
1657                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1658         }
1659         READ_BUF(8);
1660         lcp->lc_layout_type = be32_to_cpup(p++);
1661 
1662         /*
1663          * Save the layout update in XDR format and let the layout driver deal
1664          * with it later.
1665          */
1666         lcp->lc_up_len = be32_to_cpup(p++);
1667         if (lcp->lc_up_len > 0) {
1668                 READ_BUF(lcp->lc_up_len);
1669                 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1670         }
1671 
1672         DECODE_TAIL;
1673 }
1674 
1675 static __be32
1676 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1677                 struct nfsd4_layoutreturn *lrp)
1678 {
1679         DECODE_HEAD;
1680 
1681         READ_BUF(16);
1682         lrp->lr_reclaim = be32_to_cpup(p++);
1683         lrp->lr_layout_type = be32_to_cpup(p++);
1684         lrp->lr_seg.iomode = be32_to_cpup(p++);
1685         lrp->lr_return_type = be32_to_cpup(p++);
1686         if (lrp->lr_return_type == RETURN_FILE) {
1687                 READ_BUF(16);
1688                 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1689                 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1690 
1691                 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1692                 if (status)
1693                         return status;
1694 
1695                 READ_BUF(4);
1696                 lrp->lrf_body_len = be32_to_cpup(p++);
1697                 if (lrp->lrf_body_len > 0) {
1698                         READ_BUF(lrp->lrf_body_len);
1699                         READMEM(lrp->lrf_body, lrp->lrf_body_len);
1700                 }
1701         } else {
1702                 lrp->lr_seg.offset = 0;
1703                 lrp->lr_seg.length = NFS4_MAX_UINT64;
1704         }
1705 
1706         DECODE_TAIL;
1707 }
1708 #endif /* CONFIG_NFSD_PNFS */
1709 
1710 static __be32
1711 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1712                        struct nfsd4_fallocate *fallocate)
1713 {
1714         DECODE_HEAD;
1715 
1716         status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1717         if (status)
1718                 return status;
1719 
1720         READ_BUF(16);
1721         p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1722         xdr_decode_hyper(p, &fallocate->falloc_length);
1723 
1724         DECODE_TAIL;
1725 }
1726 
1727 static __be32
1728 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1729 {
1730         DECODE_HEAD;
1731 
1732         status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1733         if (status)
1734                 return status;
1735         status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1736         if (status)
1737                 return status;
1738 
1739         READ_BUF(8 + 8 + 8);
1740         p = xdr_decode_hyper(p, &clone->cl_src_pos);
1741         p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1742         p = xdr_decode_hyper(p, &clone->cl_count);
1743         DECODE_TAIL;
1744 }
1745 
1746 static __be32
1747 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1748 {
1749         DECODE_HEAD;
1750         unsigned int tmp;
1751 
1752         status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1753         if (status)
1754                 return status;
1755         status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1756         if (status)
1757                 return status;
1758 
1759         READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1760         p = xdr_decode_hyper(p, &copy->cp_src_pos);
1761         p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1762         p = xdr_decode_hyper(p, &copy->cp_count);
1763         p++; /* ca_consecutive: we always do consecutive copies */
1764         copy->cp_synchronous = be32_to_cpup(p++);
1765         tmp = be32_to_cpup(p); /* Source server list not supported */
1766 
1767         DECODE_TAIL;
1768 }
1769 
1770 static __be32
1771 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
1772                             struct nfsd4_offload_status *os)
1773 {
1774         return nfsd4_decode_stateid(argp, &os->stateid);
1775 }
1776 
1777 static __be32
1778 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1779 {
1780         DECODE_HEAD;
1781 
1782         status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1783         if (status)
1784                 return status;
1785 
1786         READ_BUF(8 + 4);
1787         p = xdr_decode_hyper(p, &seek->seek_offset);
1788         seek->seek_whence = be32_to_cpup(p);
1789 
1790         DECODE_TAIL;
1791 }
1792 
1793 static __be32
1794 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1795 {
1796         return nfs_ok;
1797 }
1798 
1799 static __be32
1800 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1801 {
1802         return nfserr_notsupp;
1803 }
1804 
1805 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1806 
1807 static const nfsd4_dec nfsd4_dec_ops[] = {
1808         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1809         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1810         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1811         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1812         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1813         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1814         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1815         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1816         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1817         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1818         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1819         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1820         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1821         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1822         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1823         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1824         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1825         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1826         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1827         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1828         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
1829         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1830         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1831         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1832         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1833         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1834         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1835         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1836         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1837         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1838         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1839         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1840         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1841         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1842         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1843         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1844         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1845 
1846         /* new operations for NFSv4.1 */
1847         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1848         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1849         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1850         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1851         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1852         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1853         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1854 #ifdef CONFIG_NFSD_PNFS
1855         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1856         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1857         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_layoutcommit,
1858         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_layoutget,
1859         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_layoutreturn,
1860 #else
1861         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1862         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1863         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1864         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1865         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1866 #endif
1867         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1868         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1869         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1870         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1871         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1872         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1873         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1874 
1875         /* new operations for NFSv4.2 */
1876         [OP_ALLOCATE]           = (nfsd4_dec)nfsd4_decode_fallocate,
1877         [OP_COPY]               = (nfsd4_dec)nfsd4_decode_copy,
1878         [OP_COPY_NOTIFY]        = (nfsd4_dec)nfsd4_decode_notsupp,
1879         [OP_DEALLOCATE]         = (nfsd4_dec)nfsd4_decode_fallocate,
1880         [OP_IO_ADVISE]          = (nfsd4_dec)nfsd4_decode_notsupp,
1881         [OP_LAYOUTERROR]        = (nfsd4_dec)nfsd4_decode_notsupp,
1882         [OP_LAYOUTSTATS]        = (nfsd4_dec)nfsd4_decode_notsupp,
1883         [OP_OFFLOAD_CANCEL]     = (nfsd4_dec)nfsd4_decode_offload_status,
1884         [OP_OFFLOAD_STATUS]     = (nfsd4_dec)nfsd4_decode_offload_status,
1885         [OP_READ_PLUS]          = (nfsd4_dec)nfsd4_decode_notsupp,
1886         [OP_SEEK]               = (nfsd4_dec)nfsd4_decode_seek,
1887         [OP_WRITE_SAME]         = (nfsd4_dec)nfsd4_decode_notsupp,
1888         [OP_CLONE]              = (nfsd4_dec)nfsd4_decode_clone,
1889 };
1890 
1891 static inline bool
1892 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1893 {
1894         if (op->opnum < FIRST_NFS4_OP)
1895                 return false;
1896         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1897                 return false;
1898         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1899                 return false;
1900         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1901                 return false;
1902         return true;
1903 }
1904 
1905 static __be32
1906 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1907 {
1908         DECODE_HEAD;
1909         struct nfsd4_op *op;
1910         bool cachethis = false;
1911         int auth_slack= argp->rqstp->rq_auth_slack;
1912         int max_reply = auth_slack + 8; /* opcnt, status */
1913         int readcount = 0;
1914         int readbytes = 0;
1915         int i;
1916 
1917         READ_BUF(4);
1918         argp->taglen = be32_to_cpup(p++);
1919         READ_BUF(argp->taglen);
1920         SAVEMEM(argp->tag, argp->taglen);
1921         READ_BUF(8);
1922         argp->minorversion = be32_to_cpup(p++);
1923         argp->opcnt = be32_to_cpup(p++);
1924         max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1925 
1926         if (argp->taglen > NFSD4_MAX_TAGLEN)
1927                 goto xdr_error;
1928         /*
1929          * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1930          * here, so we return success at the xdr level so that
1931          * nfsd4_proc can handle this is an NFS-level error.
1932          */
1933         if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1934                 return 0;
1935 
1936         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1937                 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1938                 if (!argp->ops) {
1939                         argp->ops = argp->iops;
1940                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1941                         goto xdr_error;
1942                 }
1943         }
1944 
1945         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1946                 argp->opcnt = 0;
1947 
1948         for (i = 0; i < argp->opcnt; i++) {
1949                 op = &argp->ops[i];
1950                 op->replay = NULL;
1951 
1952                 READ_BUF(4);
1953                 op->opnum = be32_to_cpup(p++);
1954 
1955                 if (nfsd4_opnum_in_range(argp, op))
1956                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1957                 else {
1958                         op->opnum = OP_ILLEGAL;
1959                         op->status = nfserr_op_illegal;
1960                 }
1961                 op->opdesc = OPDESC(op);
1962                 /*
1963                  * We'll try to cache the result in the DRC if any one
1964                  * op in the compound wants to be cached:
1965                  */
1966                 cachethis |= nfsd4_cache_this_op(op);
1967 
1968                 if (op->opnum == OP_READ) {
1969                         readcount++;
1970                         readbytes += nfsd4_max_reply(argp->rqstp, op);
1971                 } else
1972                         max_reply += nfsd4_max_reply(argp->rqstp, op);
1973                 /*
1974                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
1975                  * (Special case because it will just skip encoding this
1976                  * if it runs out of xdr buffer space, and it is the only
1977                  * operation that behaves this way.)
1978                  */
1979                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1980                         max_reply += NFS4_OPAQUE_LIMIT;
1981 
1982                 if (op->status) {
1983                         argp->opcnt = i+1;
1984                         break;
1985                 }
1986         }
1987         /* Sessions make the DRC unnecessary: */
1988         if (argp->minorversion)
1989                 cachethis = false;
1990         svc_reserve(argp->rqstp, max_reply + readbytes);
1991         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1992 
1993         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1994                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1995 
1996         DECODE_TAIL;
1997 }
1998 
1999 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2000                              struct svc_export *exp)
2001 {
2002         if (exp->ex_flags & NFSEXP_V4ROOT) {
2003                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2004                 *p++ = 0;
2005         } else if (IS_I_VERSION(inode)) {
2006                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2007         } else {
2008                 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2009                 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2010         }
2011         return p;
2012 }
2013 
2014 /*
2015  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2016  * doesn't really care what resolution could theoretically be stored by
2017  * the filesystem.
2018  *
2019  * The client cares how close together changes can be while still
2020  * guaranteeing ctime changes.  For most filesystems (which have
2021  * timestamps with nanosecond fields) that is limited by the resolution
2022  * of the time returned from current_time() (which I'm assuming to be
2023  * 1/HZ).
2024  */
2025 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2026 {
2027         struct timespec ts;
2028         u32 ns;
2029 
2030         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2031         ts = ns_to_timespec(ns);
2032 
2033         p = xdr_encode_hyper(p, ts.tv_sec);
2034         *p++ = cpu_to_be32(ts.tv_nsec);
2035 
2036         return p;
2037 }
2038 
2039 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2040 {
2041         *p++ = cpu_to_be32(c->atomic);
2042         if (c->change_supported) {
2043                 p = xdr_encode_hyper(p, c->before_change);
2044                 p = xdr_encode_hyper(p, c->after_change);
2045         } else {
2046                 *p++ = cpu_to_be32(c->before_ctime_sec);
2047                 *p++ = cpu_to_be32(c->before_ctime_nsec);
2048                 *p++ = cpu_to_be32(c->after_ctime_sec);
2049                 *p++ = cpu_to_be32(c->after_ctime_nsec);
2050         }
2051         return p;
2052 }
2053 
2054 /* Encode as an array of strings the string given with components
2055  * separated @sep, escaped with esc_enter and esc_exit.
2056  */
2057 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2058                                           char *components, char esc_enter,
2059                                           char esc_exit)
2060 {
2061         __be32 *p;
2062         __be32 pathlen;
2063         int pathlen_offset;
2064         int strlen, count=0;
2065         char *str, *end, *next;
2066 
2067         dprintk("nfsd4_encode_components(%s)\n", components);
2068 
2069         pathlen_offset = xdr->buf->len;
2070         p = xdr_reserve_space(xdr, 4);
2071         if (!p)
2072                 return nfserr_resource;
2073         p++; /* We will fill this in with @count later */
2074 
2075         end = str = components;
2076         while (*end) {
2077                 bool found_esc = false;
2078 
2079                 /* try to parse as esc_start, ..., esc_end, sep */
2080                 if (*str == esc_enter) {
2081                         for (; *end && (*end != esc_exit); end++)
2082                                 /* find esc_exit or end of string */;
2083                         next = end + 1;
2084                         if (*end && (!*next || *next == sep)) {
2085                                 str++;
2086                                 found_esc = true;
2087                         }
2088                 }
2089 
2090                 if (!found_esc)
2091                         for (; *end && (*end != sep); end++)
2092                                 /* find sep or end of string */;
2093 
2094                 strlen = end - str;
2095                 if (strlen) {
2096                         p = xdr_reserve_space(xdr, strlen + 4);
2097                         if (!p)
2098                                 return nfserr_resource;
2099                         p = xdr_encode_opaque(p, str, strlen);
2100                         count++;
2101                 }
2102                 else
2103                         end++;
2104                 if (found_esc)
2105                         end = next;
2106 
2107                 str = end;
2108         }
2109         pathlen = htonl(count);
2110         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2111         return 0;
2112 }
2113 
2114 /* Encode as an array of strings the string given with components
2115  * separated @sep.
2116  */
2117 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2118                                       char *components)
2119 {
2120         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2121 }
2122 
2123 /*
2124  * encode a location element of a fs_locations structure
2125  */
2126 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2127                                         struct nfsd4_fs_location *location)
2128 {
2129         __be32 status;
2130 
2131         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2132                                                 '[', ']');
2133         if (status)
2134                 return status;
2135         status = nfsd4_encode_components(xdr, '/', location->path);
2136         if (status)
2137                 return status;
2138         return 0;
2139 }
2140 
2141 /*
2142  * Encode a path in RFC3530 'pathname4' format
2143  */
2144 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2145                                 const struct path *root,
2146                                 const struct path *path)
2147 {
2148         struct path cur = *path;
2149         __be32 *p;
2150         struct dentry **components = NULL;
2151         unsigned int ncomponents = 0;
2152         __be32 err = nfserr_jukebox;
2153 
2154         dprintk("nfsd4_encode_components(");
2155 
2156         path_get(&cur);
2157         /* First walk the path up to the nfsd root, and store the
2158          * dentries/path components in an array.
2159          */
2160         for (;;) {
2161                 if (path_equal(&cur, root))
2162                         break;
2163                 if (cur.dentry == cur.mnt->mnt_root) {
2164                         if (follow_up(&cur))
2165                                 continue;
2166                         goto out_free;
2167                 }
2168                 if ((ncomponents & 15) == 0) {
2169                         struct dentry **new;
2170                         new = krealloc(components,
2171                                         sizeof(*new) * (ncomponents + 16),
2172                                         GFP_KERNEL);
2173                         if (!new)
2174                                 goto out_free;
2175                         components = new;
2176                 }
2177                 components[ncomponents++] = cur.dentry;
2178                 cur.dentry = dget_parent(cur.dentry);
2179         }
2180         err = nfserr_resource;
2181         p = xdr_reserve_space(xdr, 4);
2182         if (!p)
2183                 goto out_free;
2184         *p++ = cpu_to_be32(ncomponents);
2185 
2186         while (ncomponents) {
2187                 struct dentry *dentry = components[ncomponents - 1];
2188                 unsigned int len;
2189 
2190                 spin_lock(&dentry->d_lock);
2191                 len = dentry->d_name.len;
2192                 p = xdr_reserve_space(xdr, len + 4);
2193                 if (!p) {
2194                         spin_unlock(&dentry->d_lock);
2195                         goto out_free;
2196                 }
2197                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2198                 dprintk("/%pd", dentry);
2199                 spin_unlock(&dentry->d_lock);
2200                 dput(dentry);
2201                 ncomponents--;
2202         }
2203 
2204         err = 0;
2205 out_free:
2206         dprintk(")\n");
2207         while (ncomponents)
2208                 dput(components[--ncomponents]);
2209         kfree(components);
2210         path_put(&cur);
2211         return err;
2212 }
2213 
2214 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2215                         struct svc_rqst *rqstp, const struct path *path)
2216 {
2217         struct svc_export *exp_ps;
2218         __be32 res;
2219 
2220         exp_ps = rqst_find_fsidzero_export(rqstp);
2221         if (IS_ERR(exp_ps))
2222                 return nfserrno(PTR_ERR(exp_ps));
2223         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2224         exp_put(exp_ps);
2225         return res;
2226 }
2227 
2228 /*
2229  *  encode a fs_locations structure
2230  */
2231 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2232                         struct svc_rqst *rqstp, struct svc_export *exp)
2233 {
2234         __be32 status;
2235         int i;
2236         __be32 *p;
2237         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2238 
2239         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2240         if (status)
2241                 return status;
2242         p = xdr_reserve_space(xdr, 4);
2243         if (!p)
2244                 return nfserr_resource;
2245         *p++ = cpu_to_be32(fslocs->locations_count);
2246         for (i=0; i<fslocs->locations_count; i++) {
2247                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2248                 if (status)
2249                         return status;
2250         }
2251         return 0;
2252 }
2253 
2254 static u32 nfs4_file_type(umode_t mode)
2255 {
2256         switch (mode & S_IFMT) {
2257         case S_IFIFO:   return NF4FIFO;
2258         case S_IFCHR:   return NF4CHR;
2259         case S_IFDIR:   return NF4DIR;
2260         case S_IFBLK:   return NF4BLK;
2261         case S_IFLNK:   return NF4LNK;
2262         case S_IFREG:   return NF4REG;
2263         case S_IFSOCK:  return NF4SOCK;
2264         default:        return NF4BAD;
2265         };
2266 }
2267 
2268 static inline __be32
2269 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2270                      struct nfs4_ace *ace)
2271 {
2272         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2273                 return nfs4_acl_write_who(xdr, ace->whotype);
2274         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2275                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2276         else
2277                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2278 }
2279 
2280 static inline __be32
2281 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2282 {
2283         __be32          *p;
2284         unsigned long   i = hweight_long(layout_types);
2285 
2286         p = xdr_reserve_space(xdr, 4 + 4 * i);
2287         if (!p)
2288                 return nfserr_resource;
2289 
2290         *p++ = cpu_to_be32(i);
2291 
2292         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2293                 if (layout_types & (1 << i))
2294                         *p++ = cpu_to_be32(i);
2295 
2296         return 0;
2297 }
2298 
2299 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2300                               FATTR4_WORD0_RDATTR_ERROR)
2301 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2302 #define WORD2_ABSENT_FS_ATTRS 0
2303 
2304 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2305 static inline __be32
2306 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2307                             void *context, int len)
2308 {
2309         __be32 *p;
2310 
2311         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2312         if (!p)
2313                 return nfserr_resource;
2314 
2315         /*
2316          * For now we use a 0 here to indicate the null translation; in
2317          * the future we may place a call to translation code here.
2318          */
2319         *p++ = cpu_to_be32(0); /* lfs */
2320         *p++ = cpu_to_be32(0); /* pi */
2321         p = xdr_encode_opaque(p, context, len);
2322         return 0;
2323 }
2324 #else
2325 static inline __be32
2326 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2327                             void *context, int len)
2328 { return 0; }
2329 #endif
2330 
2331 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2332 {
2333         /* As per referral draft:  */
2334         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2335             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2336                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2337                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2338                         *rdattr_err = NFSERR_MOVED;
2339                 else
2340                         return nfserr_moved;
2341         }
2342         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2343         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2344         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2345         return 0;
2346 }
2347 
2348 
2349 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2350 {
2351         struct path path = exp->ex_path;
2352         int err;
2353 
2354         path_get(&path);
2355         while (follow_up(&path)) {
2356                 if (path.dentry != path.mnt->mnt_root)
2357                         break;
2358         }
2359         err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2360         path_put(&path);
2361         return err;
2362 }
2363 
2364 static __be32
2365 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2366 {
2367         __be32 *p;
2368 
2369         if (bmval2) {
2370                 p = xdr_reserve_space(xdr, 16);
2371                 if (!p)
2372                         goto out_resource;
2373                 *p++ = cpu_to_be32(3);
2374                 *p++ = cpu_to_be32(bmval0);
2375                 *p++ = cpu_to_be32(bmval1);
2376                 *p++ = cpu_to_be32(bmval2);
2377         } else if (bmval1) {
2378                 p = xdr_reserve_space(xdr, 12);
2379                 if (!p)
2380                         goto out_resource;
2381                 *p++ = cpu_to_be32(2);
2382                 *p++ = cpu_to_be32(bmval0);
2383                 *p++ = cpu_to_be32(bmval1);
2384         } else {
2385                 p = xdr_reserve_space(xdr, 8);
2386                 if (!p)
2387                         goto out_resource;
2388                 *p++ = cpu_to_be32(1);
2389                 *p++ = cpu_to_be32(bmval0);
2390         }
2391 
2392         return 0;
2393 out_resource:
2394         return nfserr_resource;
2395 }
2396 
2397 /*
2398  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2399  * ourselves.
2400  */
2401 static __be32
2402 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2403                 struct svc_export *exp,
2404                 struct dentry *dentry, u32 *bmval,
2405                 struct svc_rqst *rqstp, int ignore_crossmnt)
2406 {
2407         u32 bmval0 = bmval[0];
2408         u32 bmval1 = bmval[1];
2409         u32 bmval2 = bmval[2];
2410         struct kstat stat;
2411         struct svc_fh *tempfh = NULL;
2412         struct kstatfs statfs;
2413         __be32 *p;
2414         int starting_len = xdr->buf->len;
2415         int attrlen_offset;
2416         __be32 attrlen;
2417         u32 dummy;
2418         u64 dummy64;
2419         u32 rdattr_err = 0;
2420         __be32 status;
2421         int err;
2422         struct nfs4_acl *acl = NULL;
2423         void *context = NULL;
2424         int contextlen;
2425         bool contextsupport = false;
2426         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2427         u32 minorversion = resp->cstate.minorversion;
2428         struct path path = {
2429                 .mnt    = exp->ex_path.mnt,
2430                 .dentry = dentry,
2431         };
2432         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2433 
2434         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2435         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2436 
2437         if (exp->ex_fslocs.migrated) {
2438                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2439                 if (status)
2440                         goto out;
2441         }
2442 
2443         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2444         if (err)
2445                 goto out_nfserr;
2446         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2447                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2448             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2449                        FATTR4_WORD1_SPACE_TOTAL))) {
2450                 err = vfs_statfs(&path, &statfs);
2451                 if (err)
2452                         goto out_nfserr;
2453         }
2454         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2455                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2456                 status = nfserr_jukebox;
2457                 if (!tempfh)
2458                         goto out;
2459                 fh_init(tempfh, NFS4_FHSIZE);
2460                 status = fh_compose(tempfh, exp, dentry, NULL);
2461                 if (status)
2462                         goto out;
2463                 fhp = tempfh;
2464         }
2465         if (bmval0 & FATTR4_WORD0_ACL) {
2466                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2467                 if (err == -EOPNOTSUPP)
2468                         bmval0 &= ~FATTR4_WORD0_ACL;
2469                 else if (err == -EINVAL) {
2470                         status = nfserr_attrnotsupp;
2471                         goto out;
2472                 } else if (err != 0)
2473                         goto out_nfserr;
2474         }
2475 
2476 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2477         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2478              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2479                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2480                         err = security_inode_getsecctx(d_inode(dentry),
2481                                                 &context, &contextlen);
2482                 else
2483                         err = -EOPNOTSUPP;
2484                 contextsupport = (err == 0);
2485                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2486                         if (err == -EOPNOTSUPP)
2487                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2488                         else if (err)
2489                                 goto out_nfserr;
2490                 }
2491         }
2492 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2493 
2494         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2495         if (status)
2496                 goto out;
2497 
2498         attrlen_offset = xdr->buf->len;
2499         p = xdr_reserve_space(xdr, 4);
2500         if (!p)
2501                 goto out_resource;
2502         p++;                /* to be backfilled later */
2503 
2504         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2505                 u32 supp[3];
2506 
2507                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2508 
2509                 if (!IS_POSIXACL(dentry->d_inode))
2510                         supp[0] &= ~FATTR4_WORD0_ACL;
2511                 if (!contextsupport)
2512                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2513                 if (!supp[2]) {
2514                         p = xdr_reserve_space(xdr, 12);
2515                         if (!p)
2516                                 goto out_resource;
2517                         *p++ = cpu_to_be32(2);
2518                         *p++ = cpu_to_be32(supp[0]);
2519                         *p++ = cpu_to_be32(supp[1]);
2520                 } else {
2521                         p = xdr_reserve_space(xdr, 16);
2522                         if (!p)
2523                                 goto out_resource;
2524                         *p++ = cpu_to_be32(3);
2525                         *p++ = cpu_to_be32(supp[0]);
2526                         *p++ = cpu_to_be32(supp[1]);
2527                         *p++ = cpu_to_be32(supp[2]);
2528                 }
2529         }
2530         if (bmval0 & FATTR4_WORD0_TYPE) {
2531                 p = xdr_reserve_space(xdr, 4);
2532                 if (!p)
2533                         goto out_resource;
2534                 dummy = nfs4_file_type(stat.mode);
2535                 if (dummy == NF4BAD) {
2536                         status = nfserr_serverfault;
2537                         goto out;
2538                 }
2539                 *p++ = cpu_to_be32(dummy);
2540         }
2541         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2542                 p = xdr_reserve_space(xdr, 4);
2543                 if (!p)
2544                         goto out_resource;
2545                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2546                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2547                 else
2548                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2549                                                 NFS4_FH_VOL_RENAME);
2550         }
2551         if (bmval0 & FATTR4_WORD0_CHANGE) {
2552                 p = xdr_reserve_space(xdr, 8);
2553                 if (!p)
2554                         goto out_resource;
2555                 p = encode_change(p, &stat, d_inode(dentry), exp);
2556         }
2557         if (bmval0 & FATTR4_WORD0_SIZE) {
2558                 p = xdr_reserve_space(xdr, 8);
2559                 if (!p)
2560                         goto out_resource;
2561                 p = xdr_encode_hyper(p, stat.size);
2562         }
2563         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2564                 p = xdr_reserve_space(xdr, 4);
2565                 if (!p)
2566                         goto out_resource;
2567                 *p++ = cpu_to_be32(1);
2568         }
2569         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2570                 p = xdr_reserve_space(xdr, 4);
2571                 if (!p)
2572                         goto out_resource;
2573                 *p++ = cpu_to_be32(1);
2574         }
2575         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2576                 p = xdr_reserve_space(xdr, 4);
2577                 if (!p)
2578                         goto out_resource;
2579                 *p++ = cpu_to_be32(0);
2580         }
2581         if (bmval0 & FATTR4_WORD0_FSID) {
2582                 p = xdr_reserve_space(xdr, 16);
2583                 if (!p)
2584                         goto out_resource;
2585                 if (exp->ex_fslocs.migrated) {
2586                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2587                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2588                 } else switch(fsid_source(fhp)) {
2589                 case FSIDSOURCE_FSID:
2590                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2591                         p = xdr_encode_hyper(p, (u64)0);
2592                         break;
2593                 case FSIDSOURCE_DEV:
2594                         *p++ = cpu_to_be32(0);
2595                         *p++ = cpu_to_be32(MAJOR(stat.dev));
2596                         *p++ = cpu_to_be32(0);
2597                         *p++ = cpu_to_be32(MINOR(stat.dev));
2598                         break;
2599                 case FSIDSOURCE_UUID:
2600                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2601                                                                 EX_UUID_LEN);
2602                         break;
2603                 }
2604         }
2605         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2606                 p = xdr_reserve_space(xdr, 4);
2607                 if (!p)
2608                         goto out_resource;
2609                 *p++ = cpu_to_be32(0);
2610         }
2611         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2612                 p = xdr_reserve_space(xdr, 4);
2613                 if (!p)
2614                         goto out_resource;
2615                 *p++ = cpu_to_be32(nn->nfsd4_lease);
2616         }
2617         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2618                 p = xdr_reserve_space(xdr, 4);
2619                 if (!p)
2620                         goto out_resource;
2621                 *p++ = cpu_to_be32(rdattr_err);
2622         }
2623         if (bmval0 & FATTR4_WORD0_ACL) {
2624                 struct nfs4_ace *ace;
2625 
2626                 if (acl == NULL) {
2627                         p = xdr_reserve_space(xdr, 4);
2628                         if (!p)
2629                                 goto out_resource;
2630 
2631                         *p++ = cpu_to_be32(0);
2632                         goto out_acl;
2633                 }
2634                 p = xdr_reserve_space(xdr, 4);
2635                 if (!p)
2636                         goto out_resource;
2637                 *p++ = cpu_to_be32(acl->naces);
2638 
2639                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2640                         p = xdr_reserve_space(xdr, 4*3);
2641                         if (!p)
2642                                 goto out_resource;
2643                         *p++ = cpu_to_be32(ace->type);
2644                         *p++ = cpu_to_be32(ace->flag);
2645                         *p++ = cpu_to_be32(ace->access_mask &
2646                                                         NFS4_ACE_MASK_ALL);
2647                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
2648                         if (status)
2649                                 goto out;
2650                 }
2651         }
2652 out_acl:
2653         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2654                 p = xdr_reserve_space(xdr, 4);
2655                 if (!p)
2656                         goto out_resource;
2657                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2658                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2659         }
2660         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2661                 p = xdr_reserve_space(xdr, 4);
2662                 if (!p)
2663                         goto out_resource;
2664                 *p++ = cpu_to_be32(1);
2665         }
2666         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2667                 p = xdr_reserve_space(xdr, 4);
2668                 if (!p)
2669                         goto out_resource;
2670                 *p++ = cpu_to_be32(0);
2671         }
2672         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2673                 p = xdr_reserve_space(xdr, 4);
2674                 if (!p)
2675                         goto out_resource;
2676                 *p++ = cpu_to_be32(1);
2677         }
2678         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2679                 p = xdr_reserve_space(xdr, 4);
2680                 if (!p)
2681                         goto out_resource;
2682                 *p++ = cpu_to_be32(1);
2683         }
2684         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2685                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2686                 if (!p)
2687                         goto out_resource;
2688                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2689                                         fhp->fh_handle.fh_size);
2690         }
2691         if (bmval0 & FATTR4_WORD0_FILEID) {
2692                 p = xdr_reserve_space(xdr, 8);
2693                 if (!p)
2694                         goto out_resource;
2695                 p = xdr_encode_hyper(p, stat.ino);
2696         }
2697         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2698                 p = xdr_reserve_space(xdr, 8);
2699                 if (!p)
2700                         goto out_resource;
2701                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2702         }
2703         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2704                 p = xdr_reserve_space(xdr, 8);
2705                 if (!p)
2706                         goto out_resource;
2707                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2708         }
2709         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2710                 p = xdr_reserve_space(xdr, 8);
2711                 if (!p)
2712                         goto out_resource;
2713                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2714         }
2715         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2716                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2717                 if (status)
2718                         goto out;
2719         }
2720         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2721                 p = xdr_reserve_space(xdr, 4);
2722                 if (!p)
2723                         goto out_resource;
2724                 *p++ = cpu_to_be32(1);
2725         }
2726         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2727                 p = xdr_reserve_space(xdr, 8);
2728                 if (!p)
2729                         goto out_resource;
2730                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2731         }
2732         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2733                 p = xdr_reserve_space(xdr, 4);
2734                 if (!p)
2735                         goto out_resource;
2736                 *p++ = cpu_to_be32(255);
2737         }
2738         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2739                 p = xdr_reserve_space(xdr, 4);
2740                 if (!p)
2741                         goto out_resource;
2742                 *p++ = cpu_to_be32(statfs.f_namelen);
2743         }
2744         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2745                 p = xdr_reserve_space(xdr, 8);
2746                 if (!p)
2747                         goto out_resource;
2748                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2749         }
2750         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2751                 p = xdr_reserve_space(xdr, 8);
2752                 if (!p)
2753                         goto out_resource;
2754                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2755         }
2756         if (bmval1 & FATTR4_WORD1_MODE) {
2757                 p = xdr_reserve_space(xdr, 4);
2758                 if (!p)
2759                         goto out_resource;
2760                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2761         }
2762         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2763                 p = xdr_reserve_space(xdr, 4);
2764                 if (!p)
2765                         goto out_resource;
2766                 *p++ = cpu_to_be32(1);
2767         }
2768         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2769                 p = xdr_reserve_space(xdr, 4);
2770                 if (!p)
2771                         goto out_resource;
2772                 *p++ = cpu_to_be32(stat.nlink);
2773         }
2774         if (bmval1 & FATTR4_WORD1_OWNER) {
2775                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2776                 if (status)
2777                         goto out;
2778         }
2779         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2780                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2781                 if (status)
2782                         goto out;
2783         }
2784         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2785                 p = xdr_reserve_space(xdr, 8);
2786                 if (!p)
2787                         goto out_resource;
2788                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2789                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2790         }
2791         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2792                 p = xdr_reserve_space(xdr, 8);
2793                 if (!p)
2794                         goto out_resource;
2795                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2796                 p = xdr_encode_hyper(p, dummy64);
2797         }
2798         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2799                 p = xdr_reserve_space(xdr, 8);
2800                 if (!p)
2801                         goto out_resource;
2802                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2803                 p = xdr_encode_hyper(p, dummy64);
2804         }
2805         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2806                 p = xdr_reserve_space(xdr, 8);
2807                 if (!p)
2808                         goto out_resource;
2809                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2810                 p = xdr_encode_hyper(p, dummy64);
2811         }
2812         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2813                 p = xdr_reserve_space(xdr, 8);
2814                 if (!p)
2815                         goto out_resource;
2816                 dummy64 = (u64)stat.blocks << 9;
2817                 p = xdr_encode_hyper(p, dummy64);
2818         }
2819         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2820                 p = xdr_reserve_space(xdr, 12);
2821                 if (!p)
2822                         goto out_resource;
2823                 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2824                 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2825         }
2826         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2827                 p = xdr_reserve_space(xdr, 12);
2828                 if (!p)
2829                         goto out_resource;
2830                 p = encode_time_delta(p, d_inode(dentry));
2831         }
2832         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2833                 p = xdr_reserve_space(xdr, 12);
2834                 if (!p)
2835                         goto out_resource;
2836                 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2837                 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2838         }
2839         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2840                 p = xdr_reserve_space(xdr, 12);
2841                 if (!p)
2842                         goto out_resource;
2843                 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2844                 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2845         }
2846         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2847                 struct kstat parent_stat;
2848                 u64 ino = stat.ino;
2849 
2850                 p = xdr_reserve_space(xdr, 8);
2851                 if (!p)
2852                         goto out_resource;
2853                 /*
2854                  * Get parent's attributes if not ignoring crossmount
2855                  * and this is the root of a cross-mounted filesystem.
2856                  */
2857                 if (ignore_crossmnt == 0 &&
2858                     dentry == exp->ex_path.mnt->mnt_root) {
2859                         err = get_parent_attributes(exp, &parent_stat);
2860                         if (err)
2861                                 goto out_nfserr;
2862                         ino = parent_stat.ino;
2863                 }
2864                 p = xdr_encode_hyper(p, ino);
2865         }
2866 #ifdef CONFIG_NFSD_PNFS
2867         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2868                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2869                 if (status)
2870                         goto out;
2871         }
2872 
2873         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2874                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2875                 if (status)
2876                         goto out;
2877         }
2878 
2879         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2880                 p = xdr_reserve_space(xdr, 4);
2881                 if (!p)
2882                         goto out_resource;
2883                 *p++ = cpu_to_be32(stat.blksize);
2884         }
2885 #endif /* CONFIG_NFSD_PNFS */
2886         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2887                 u32 supp[3];
2888 
2889                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2890                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2891                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2892                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2893 
2894                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2895                 if (status)
2896                         goto out;
2897         }
2898 
2899         if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2900                 p = xdr_reserve_space(xdr, 4);
2901                 if (!p)
2902                         goto out_resource;
2903                 if (IS_I_VERSION(d_inode(dentry)))
2904                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2905                 else
2906                         *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2907         }
2908 
2909         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2910                 status = nfsd4_encode_security_label(xdr, rqstp, context,
2911                                                                 contextlen);
2912                 if (status)
2913                         goto out;
2914         }
2915 
2916         attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2917         write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2918         status = nfs_ok;
2919 
2920 out:
2921 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2922         if (context)
2923                 security_release_secctx(context, contextlen);
2924 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2925         kfree(acl);
2926         if (tempfh) {
2927                 fh_put(tempfh);
2928                 kfree(tempfh);
2929         }
2930         if (status)
2931                 xdr_truncate_encode(xdr, starting_len);
2932         return status;
2933 out_nfserr:
2934         status = nfserrno(err);
2935         goto out;
2936 out_resource:
2937         status = nfserr_resource;
2938         goto out;
2939 }
2940 
2941 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2942                                 struct xdr_buf *buf, __be32 *p, int bytes)
2943 {
2944         xdr->scratch.iov_len = 0;
2945         memset(buf, 0, sizeof(struct xdr_buf));
2946         buf->head[0].iov_base = p;
2947         buf->head[0].iov_len = 0;
2948         buf->len = 0;
2949         xdr->buf = buf;
2950         xdr->iov = buf->head;
2951         xdr->p = p;
2952         xdr->end = (void *)p + bytes;
2953         buf->buflen = bytes;
2954 }
2955 
2956 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2957                         struct svc_fh *fhp, struct svc_export *exp,
2958                         struct dentry *dentry, u32 *bmval,
2959                         struct svc_rqst *rqstp, int ignore_crossmnt)
2960 {
2961         struct xdr_buf dummy;
2962         struct xdr_stream xdr;
2963         __be32 ret;
2964 
2965         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2966         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2967                                                         ignore_crossmnt);
2968         *p = xdr.p;
2969         return ret;
2970 }
2971 
2972 static inline int attributes_need_mount(u32 *bmval)
2973 {
2974         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2975                 return 1;
2976         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2977                 return 1;
2978         return 0;
2979 }
2980 
2981 static __be32
2982 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2983                         const char *name, int namlen)
2984 {
2985         struct svc_export *exp = cd->rd_fhp->fh_export;
2986         struct dentry *dentry;
2987         __be32 nfserr;
2988         int ignore_crossmnt = 0;
2989 
2990         dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2991         if (IS_ERR(dentry))
2992                 return nfserrno(PTR_ERR(dentry));
2993         if (d_really_is_negative(dentry)) {
2994                 /*
2995                  * we're not holding the i_mutex here, so there's
2996                  * a window where this directory entry could have gone
2997                  * away.
2998                  */
2999                 dput(dentry);
3000                 return nfserr_noent;
3001         }
3002 
3003         exp_get(exp);
3004         /*
3005          * In the case of a mountpoint, the client may be asking for
3006          * attributes that are only properties of the underlying filesystem
3007          * as opposed to the cross-mounted file system. In such a case,
3008          * we will not follow the cross mount and will fill the attribtutes
3009          * directly from the mountpoint dentry.
3010          */
3011         if (nfsd_mountpoint(dentry, exp)) {
3012                 int err;
3013 
3014                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3015                                 && !attributes_need_mount(cd->rd_bmval)) {
3016                         ignore_crossmnt = 1;
3017                         goto out_encode;
3018                 }
3019                 /*
3020                  * Why the heck aren't we just using nfsd_lookup??
3021                  * Different "."/".." handling?  Something else?
3022                  * At least, add a comment here to explain....
3023                  */
3024                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3025                 if (err) {
3026                         nfserr = nfserrno(err);
3027                         goto out_put;
3028                 }
3029                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3030                 if (nfserr)
3031                         goto out_put;
3032 
3033         }
3034 out_encode:
3035         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3036                                         cd->rd_rqstp, ignore_crossmnt);
3037 out_put:
3038         dput(dentry);
3039         exp_put(exp);
3040         return nfserr;
3041 }
3042 
3043 static __be32 *
3044 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3045 {
3046         __be32 *p;
3047 
3048         p = xdr_reserve_space(xdr, 20);
3049         if (!p)
3050                 return NULL;
3051         *p++ = htonl(2);
3052         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3053         *p++ = htonl(0);                         /* bmval1 */
3054 
3055         *p++ = htonl(4);     /* attribute length */
3056         *p++ = nfserr;       /* no htonl */
3057         return p;
3058 }
3059 
3060 static int
3061 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3062                     loff_t offset, u64 ino, unsigned int d_type)
3063 {
3064         struct readdir_cd *ccd = ccdv;
3065         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3066         struct xdr_stream *xdr = cd->xdr;
3067         int start_offset = xdr->buf->len;
3068         int cookie_offset;
3069         u32 name_and_cookie;
3070         int entry_bytes;
3071         __be32 nfserr = nfserr_toosmall;
3072         __be64 wire_offset;
3073         __be32 *p;
3074 
3075         /* In nfsv4, "." and ".." never make it onto the wire.. */
3076         if (name && isdotent(name, namlen)) {
3077                 cd->common.err = nfs_ok;
3078                 return 0;
3079         }
3080 
3081         if (cd->cookie_offset) {
3082                 wire_offset = cpu_to_be64(offset);
3083                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3084                                                         &wire_offset, 8);
3085         }
3086 
3087         p = xdr_reserve_space(xdr, 4);
3088         if (!p)
3089                 goto fail;
3090         *p++ = xdr_one;                             /* mark entry present */
3091         cookie_offset = xdr->buf->len;
3092         p = xdr_reserve_space(xdr, 3*4 + namlen);
3093         if (!p)
3094                 goto fail;
3095         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
3096         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3097 
3098         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3099         switch (nfserr) {
3100         case nfs_ok:
3101                 break;
3102         case nfserr_resource:
3103                 nfserr = nfserr_toosmall;
3104                 goto fail;
3105         case nfserr_noent:
3106                 xdr_truncate_encode(xdr, start_offset);
3107                 goto skip_entry;
3108         default:
3109                 /*
3110                  * If the client requested the RDATTR_ERROR attribute,
3111                  * we stuff the error code into this attribute
3112                  * and continue.  If this attribute was not requested,
3113                  * then in accordance with the spec, we fail the
3114                  * entire READDIR operation(!)
3115                  */
3116                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3117                         goto fail;
3118                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3119                 if (p == NULL) {
3120                         nfserr = nfserr_toosmall;
3121                         goto fail;
3122                 }
3123         }
3124         nfserr = nfserr_toosmall;
3125         entry_bytes = xdr->buf->len - start_offset;
3126         if (entry_bytes > cd->rd_maxcount)
3127                 goto fail;
3128         cd->rd_maxcount -= entry_bytes;
3129         /*
3130          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3131          * let's always let through the first entry, at least:
3132          */
3133         if (!cd->rd_dircount)
3134                 goto fail;
3135         name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3136         if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3137                 goto fail;
3138         cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3139 
3140         cd->cookie_offset = cookie_offset;
3141 skip_entry:
3142         cd->common.err = nfs_ok;
3143         return 0;
3144 fail:
3145         xdr_truncate_encode(xdr, start_offset);
3146         cd->common.err = nfserr;
3147         return -EINVAL;
3148 }
3149 
3150 static __be32
3151 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3152 {
3153         __be32 *p;
3154 
3155         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3156         if (!p)
3157                 return nfserr_resource;
3158         *p++ = cpu_to_be32(sid->si_generation);
3159         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3160                                         sizeof(stateid_opaque_t));
3161         return 0;
3162 }
3163 
3164 static __be32
3165 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3166 {
3167         struct xdr_stream *xdr = &resp->xdr;
3168         __be32 *p;
3169 
3170         p = xdr_reserve_space(xdr, 8);
3171         if (!p)
3172                 return nfserr_resource;
3173         *p++ = cpu_to_be32(access->ac_supported);
3174         *p++ = cpu_to_be32(access->ac_resp_access);
3175         return 0;
3176 }
3177 
3178 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3179 {
3180         struct xdr_stream *xdr = &resp->xdr;
3181         __be32 *p;
3182 
3183         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3184         if (!p)
3185                 return nfserr_resource;
3186         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3187                                         NFS4_MAX_SESSIONID_LEN);
3188         *p++ = cpu_to_be32(bcts->dir);
3189         /* Upshifting from TCP to RDMA is not supported */
3190         *p++ = cpu_to_be32(0);
3191         return 0;
3192 }
3193 
3194 static __be32
3195 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3196 {
3197         struct xdr_stream *xdr = &resp->xdr;
3198 
3199         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3200 }
3201 
3202 
3203 static __be32
3204 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3205 {
3206         struct xdr_stream *xdr = &resp->xdr;
3207         __be32 *p;
3208 
3209         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3210         if (!p)
3211                 return nfserr_resource;
3212         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3213                                                 NFS4_VERIFIER_SIZE);
3214         return 0;
3215 }
3216 
3217 static __be32
3218 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3219 {
3220         struct xdr_stream *xdr = &resp->xdr;
3221         __be32 *p;
3222 
3223         p = xdr_reserve_space(xdr, 20);
3224         if (!p)
3225                 return nfserr_resource;
3226         encode_cinfo(p, &create->cr_cinfo);
3227         nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3228                         create->cr_bmval[1], create->cr_bmval[2]);
3229         return 0;
3230 }
3231 
3232 static __be32
3233 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3234 {
3235         struct svc_fh *fhp = getattr->ga_fhp;
3236         struct xdr_stream *xdr = &resp->xdr;
3237 
3238         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3239                                     getattr->ga_bmval, resp->rqstp, 0);
3240 }
3241 
3242 static __be32
3243 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3244 {
3245         struct xdr_stream *xdr = &resp->xdr;
3246         struct svc_fh *fhp = *fhpp;
3247         unsigned int len;
3248         __be32 *p;
3249 
3250         len = fhp->fh_handle.fh_size;
3251         p = xdr_reserve_space(xdr, len + 4);
3252         if (!p)
3253                 return nfserr_resource;
3254         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3255         return 0;
3256 }
3257 
3258 /*
3259 * Including all fields other than the name, a LOCK4denied structure requires
3260 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3261 */
3262 static __be32
3263 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3264 {
3265         struct xdr_netobj *conf = &ld->ld_owner;
3266         __be32 *p;
3267 
3268 again:
3269         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3270         if (!p) {
3271                 /*
3272                  * Don't fail to return the result just because we can't
3273                  * return the conflicting open:
3274                  */
3275                 if (conf->len) {
3276                         kfree(conf->data);
3277                         conf->len = 0;
3278                         conf->data = NULL;
3279                         goto again;
3280                 }
3281                 return nfserr_resource;
3282         }
3283         p = xdr_encode_hyper(p, ld->ld_start);
3284         p = xdr_encode_hyper(p, ld->ld_length);
3285         *p++ = cpu_to_be32(ld->ld_type);
3286         if (conf->len) {
3287                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3288                 p = xdr_encode_opaque(p, conf->data, conf->len);
3289                 kfree(conf->data);
3290         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3291                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3292                 *p++ = cpu_to_be32(0); /* length of owner name */
3293         }
3294         return nfserr_denied;
3295 }
3296 
3297 static __be32
3298 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3299 {
3300         struct xdr_stream *xdr = &resp->xdr;
3301 
3302         if (!nfserr)
3303                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3304         else if (nfserr == nfserr_denied)
3305                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3306 
3307         return nfserr;
3308 }
3309 
3310 static __be32
3311 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3312 {
3313         struct xdr_stream *xdr = &resp->xdr;
3314 
3315         if (nfserr == nfserr_denied)
3316                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3317         return nfserr;
3318 }
3319 
3320 static __be32
3321 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3322 {
3323         struct xdr_stream *xdr = &resp->xdr;
3324 
3325         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3326 }
3327 
3328 
3329 static __be32
3330 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3331 {
3332         struct xdr_stream *xdr = &resp->xdr;
3333         __be32 *p;
3334 
3335         p = xdr_reserve_space(xdr, 20);
3336         if (!p)
3337                 return nfserr_resource;
3338         p = encode_cinfo(p, &link->li_cinfo);
3339         return 0;
3340 }
3341 
3342 
3343 static __be32
3344 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3345 {
3346         struct xdr_stream *xdr = &resp->xdr;
3347         __be32 *p;
3348 
3349         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3350         if (nfserr)
3351                 return nfserr;
3352         p = xdr_reserve_space(xdr, 24);
3353         if (!p)
3354                 return nfserr_resource;
3355         p = encode_cinfo(p, &open->op_cinfo);
3356         *p++ = cpu_to_be32(open->op_rflags);
3357 
3358         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3359                                         open->op_bmval[2]);
3360         if (nfserr)
3361                 return nfserr;
3362 
3363         p = xdr_reserve_space(xdr, 4);
3364         if (!p)
3365                 return nfserr_resource;
3366 
3367         *p++ = cpu_to_be32(open->op_delegate_type);
3368         switch (open->op_delegate_type) {
3369         case NFS4_OPEN_DELEGATE_NONE:
3370                 break;
3371         case NFS4_OPEN_DELEGATE_READ:
3372                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3373                 if (nfserr)
3374                         return nfserr;
3375                 p = xdr_reserve_space(xdr, 20);
3376                 if (!p)
3377                         return nfserr_resource;
3378                 *p++ = cpu_to_be32(open->op_recall);
3379 
3380                 /*
3381                  * TODO: ACE's in delegations
3382                  */
3383                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3384                 *p++ = cpu_to_be32(0);
3385                 *p++ = cpu_to_be32(0);
3386                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3387                 break;
3388         case NFS4_OPEN_DELEGATE_WRITE:
3389                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3390                 if (nfserr)
3391                         return nfserr;
3392                 p = xdr_reserve_space(xdr, 32);
3393                 if (!p)
3394                         return nfserr_resource;
3395                 *p++ = cpu_to_be32(0);
3396 
3397                 /*
3398                  * TODO: space_limit's in delegations
3399                  */
3400                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3401                 *p++ = cpu_to_be32(~(u32)0);
3402                 *p++ = cpu_to_be32(~(u32)0);
3403 
3404                 /*
3405                  * TODO: ACE's in delegations
3406                  */
3407                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3408                 *p++ = cpu_to_be32(0);
3409                 *p++ = cpu_to_be32(0);
3410                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3411                 break;
3412         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3413                 switch (open->op_why_no_deleg) {
3414                 case WND4_CONTENTION:
3415                 case WND4_RESOURCE:
3416                         p = xdr_reserve_space(xdr, 8);
3417                         if (!p)
3418                                 return nfserr_resource;
3419                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3420                         /* deleg signaling not supported yet: */
3421                         *p++ = cpu_to_be32(0);
3422                         break;
3423                 default:
3424                         p = xdr_reserve_space(xdr, 4);
3425                         if (!p)
3426                                 return nfserr_resource;
3427                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3428                 }
3429                 break;
3430         default:
3431                 BUG();
3432         }
3433         /* XXX save filehandle here */
3434         return 0;
3435 }
3436 
3437 static __be32
3438 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3439 {
3440         struct xdr_stream *xdr = &resp->xdr;
3441 
3442         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3443 }
3444 
3445 static __be32
3446 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3447 {
3448         struct xdr_stream *xdr = &resp->xdr;
3449 
3450         return nfsd4_encode_stateid(xdr, &od->od_stateid);
3451 }
3452 
3453 static __be32 nfsd4_encode_splice_read(
3454                                 struct nfsd4_compoundres *resp,
3455                                 struct nfsd4_read *read,
3456                                 struct file *file, unsigned long maxcount)
3457 {
3458         struct xdr_stream *xdr = &resp->xdr;
3459         struct xdr_buf *buf = xdr->buf;
3460         u32 eof;
3461         long len;
3462         int space_left;
3463         __be32 nfserr;
3464         __be32 *p = xdr->p - 2;
3465 
3466         /* Make sure there will be room for padding if needed */
3467         if (xdr->end - xdr->p < 1)
3468                 return nfserr_resource;
3469 
3470         len = maxcount;
3471         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3472                                   file, read->rd_offset, &maxcount);
3473         read->rd_length = maxcount;
3474         if (nfserr) {
3475                 /*
3476                  * nfsd_splice_actor may have already messed with the
3477                  * page length; reset it so as not to confuse
3478                  * xdr_truncate_encode:
3479                  */
3480                 buf->page_len = 0;
3481                 return nfserr;
3482         }
3483 
3484         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3485                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3486 
3487         *(p++) = htonl(eof);
3488         *(p++) = htonl(maxcount);
3489 
3490         buf->page_len = maxcount;
3491         buf->len += maxcount;
3492         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3493                                                         / PAGE_SIZE;
3494 
3495         /* Use rest of head for padding and remaining ops: */
3496         buf->tail[0].iov_base = xdr->p;
3497         buf->tail[0].iov_len = 0;
3498         xdr->iov = buf->tail;
3499         if (maxcount&3) {
3500                 int pad = 4 - (maxcount&3);
3501 
3502                 *(xdr->p++) = 0;
3503 
3504                 buf->tail[0].iov_base += maxcount&3;
3505                 buf->tail[0].iov_len = pad;
3506                 buf->len += pad;
3507         }
3508 
3509         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3510                                 buf->buflen - buf->len);
3511         buf->buflen = buf->len + space_left;
3512         xdr->end = (__be32 *)((void *)xdr->end + space_left);
3513 
3514         return 0;
3515 }
3516 
3517 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3518                                  struct nfsd4_read *read,
3519                                  struct file *file, unsigned long maxcount)
3520 {
3521         struct xdr_stream *xdr = &resp->xdr;
3522         u32 eof;
3523         int v;
3524         int starting_len = xdr->buf->len - 8;
3525         long len;
3526         int thislen;
3527         __be32 nfserr;
3528         __be32 tmp;
3529         __be32 *p;
3530         u32 zzz = 0;
3531         int pad;
3532 
3533         len = maxcount;
3534         v = 0;
3535 
3536         thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3537         p = xdr_reserve_space(xdr, (thislen+3)&~3);
3538         WARN_ON_ONCE(!p);
3539         resp->rqstp->rq_vec[v].iov_base = p;
3540         resp->rqstp->rq_vec[v].iov_len = thislen;
3541         v++;
3542         len -= thislen;
3543 
3544         while (len) {
3545                 thislen = min_t(long, len, PAGE_SIZE);
3546                 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3547                 WARN_ON_ONCE(!p);
3548                 resp->rqstp->rq_vec[v].iov_base = p;
3549                 resp->rqstp->rq_vec[v].iov_len = thislen;
3550                 v++;
3551                 len -= thislen;
3552         }
3553         read->rd_vlen = v;
3554 
3555         len = maxcount;
3556         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3557                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3558         read->rd_length = maxcount;
3559         if (nfserr)
3560                 return nfserr;
3561         xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3562 
3563         eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3564                                 d_inode(read->rd_fhp->fh_dentry)->i_size);
3565 
3566         tmp = htonl(eof);
3567         write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
3568         tmp = htonl(maxcount);
3569         write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3570 
3571         pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3572         write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3573                                                                 &zzz, pad);
3574         return 0;
3575 
3576 }
3577 
3578 static __be32
3579 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3580                   struct nfsd4_read *read)
3581 {
3582         unsigned long maxcount;
3583         struct xdr_stream *xdr = &resp->xdr;
3584         struct file *file = read->rd_filp;
3585         int starting_len = xdr->buf->len;
3586         struct raparms *ra = NULL;
3587         __be32 *p;
3588 
3589         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3590         if (!p) {
3591                 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3592                 return nfserr_resource;
3593         }
3594         if (resp->xdr.buf->page_len &&
3595             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3596                 WARN_ON_ONCE(1);
3597                 return nfserr_resource;
3598         }
3599         xdr_commit_encode(xdr);
3600 
3601         maxcount = svc_max_payload(resp->rqstp);
3602         maxcount = min_t(unsigned long, maxcount,
3603                          (xdr->buf->buflen - xdr->buf->len));
3604         maxcount = min_t(unsigned long, maxcount, read->rd_length);
3605 
3606         if (read->rd_tmp_file)
3607                 ra = nfsd_init_raparms(file);
3608 
3609         if (file->f_op->splice_read &&
3610             test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3611                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3612         else
3613                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3614 
3615         if (ra)
3616                 nfsd_put_raparams(file, ra);
3617 
3618         if (nfserr)
3619                 xdr_truncate_encode(xdr, starting_len);
3620 
3621         return nfserr;
3622 }
3623 
3624 static __be32
3625 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3626 {
3627         int maxcount;
3628         __be32 wire_count;
3629         int zero = 0;
3630         struct xdr_stream *xdr = &resp->xdr;
3631         int length_offset = xdr->buf->len;
3632         __be32 *p;
3633 
3634         p = xdr_reserve_space(xdr, 4);
3635         if (!p)
3636                 return nfserr_resource;
3637         maxcount = PAGE_SIZE;
3638 
3639         p = xdr_reserve_space(xdr, maxcount);
3640         if (!p)
3641                 return nfserr_resource;
3642         /*
3643          * XXX: By default, vfs_readlink() will truncate symlinks if they
3644          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
3645          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3646          * that truncation occurred, and return NFS4ERR_RESOURCE.
3647          */
3648         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3649                                                 (char *)p, &maxcount);
3650         if (nfserr == nfserr_isdir)
3651                 nfserr = nfserr_inval;
3652         if (nfserr) {
3653                 xdr_truncate_encode(xdr, length_offset);
3654                 return nfserr;
3655         }
3656 
3657         wire_count = htonl(maxcount);
3658         write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3659         xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3660         if (maxcount & 3)
3661                 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3662                                                 &zero, 4 - (maxcount&3));
3663         return 0;
3664 }
3665 
3666 static __be32
3667 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3668 {
3669         int maxcount;
3670         int bytes_left;
3671         loff_t offset;
3672         __be64 wire_offset;
3673         struct xdr_stream *xdr = &resp->xdr;
3674         int starting_len = xdr->buf->len;
3675         __be32 *p;
3676 
3677         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3678         if (!p)
3679                 return nfserr_resource;
3680 
3681         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3682         *p++ = cpu_to_be32(0);
3683         *p++ = cpu_to_be32(0);
3684         resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3685                                 - (char *)resp->xdr.buf->head[0].iov_base;
3686 
3687         /*
3688          * Number of bytes left for directory entries allowing for the
3689          * final 8 bytes of the readdir and a following failed op:
3690          */
3691         bytes_left = xdr->buf->buflen - xdr->buf->len
3692                         - COMPOUND_ERR_SLACK_SPACE - 8;
3693         if (bytes_left < 0) {
3694                 nfserr = nfserr_resource;
3695                 goto err_no_verf;
3696         }
3697         maxcount = svc_max_payload(resp->rqstp);
3698         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3699         /*
3700          * Note the rfc defines rd_maxcount as the size of the
3701          * READDIR4resok structure, which includes the verifier above
3702          * and the 8 bytes encoded at the end of this function:
3703          */
3704         if (maxcount < 16) {
3705                 nfserr = nfserr_toosmall;
3706                 goto err_no_verf;
3707         }
3708         maxcount = min_t(int, maxcount-16, bytes_left);
3709 
3710         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3711         if (!readdir->rd_dircount)
3712                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3713 
3714         readdir->xdr = xdr;
3715         readdir->rd_maxcount = maxcount;
3716         readdir->common.err = 0;
3717         readdir->cookie_offset = 0;
3718 
3719         offset = readdir->rd_cookie;
3720         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3721                               &offset,
3722                               &readdir->common, nfsd4_encode_dirent);
3723         if (nfserr == nfs_ok &&
3724             readdir->common.err == nfserr_toosmall &&
3725             xdr->buf->len == starting_len + 8) {
3726                 /* nothing encoded; which limit did we hit?: */
3727                 if (maxcount - 16 < bytes_left)
3728                         /* It was the fault of rd_maxcount: */
3729                         nfserr = nfserr_toosmall;
3730                 else
3731                         /* We ran out of buffer space: */
3732                         nfserr = nfserr_resource;
3733         }
3734         if (nfserr)
3735                 goto err_no_verf;
3736 
3737         if (readdir->cookie_offset) {
3738                 wire_offset = cpu_to_be64(offset);
3739                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3740                                                         &wire_offset, 8);
3741         }
3742 
3743         p = xdr_reserve_space(xdr, 8);
3744         if (!p) {
3745                 WARN_ON_ONCE(1);
3746                 goto err_no_verf;
3747         }
3748         *p++ = 0;       /* no more entries */
3749         *p++ = htonl(readdir->common.err == nfserr_eof);
3750 
3751         return 0;
3752 err_no_verf:
3753         xdr_truncate_encode(xdr, starting_len);
3754         return nfserr;
3755 }
3756 
3757 static __be32
3758 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3759 {
3760         struct xdr_stream *xdr = &resp->xdr;
3761         __be32 *p;
3762 
3763         p = xdr_reserve_space(xdr, 20);
3764         if (!p)
3765                 return nfserr_resource;
3766         p = encode_cinfo(p, &remove->rm_cinfo);
3767         return 0;
3768 }
3769 
3770 static __be32
3771 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3772 {
3773         struct xdr_stream *xdr = &resp->xdr;
3774         __be32 *p;
3775 
3776         p = xdr_reserve_space(xdr, 40);
3777         if (!p)
3778                 return nfserr_resource;
3779         p = encode_cinfo(p, &rename->rn_sinfo);
3780         p = encode_cinfo(p, &rename->rn_tinfo);
3781         return 0;
3782 }
3783 
3784 static __be32
3785 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3786 {
3787         u32 i, nflavs, supported;
3788         struct exp_flavor_info *flavs;
3789         struct exp_flavor_info def_flavs[2];
3790         __be32 *p, *flavorsp;
3791         static bool report = true;
3792 
3793         if (exp->ex_nflavors) {
3794                 flavs = exp->ex_flavors;
3795                 nflavs = exp->ex_nflavors;
3796         } else { /* Handling of some defaults in absence of real secinfo: */
3797                 flavs = def_flavs;
3798                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3799                         nflavs = 2;
3800                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3801                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3802                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3803                         nflavs = 1;
3804                         flavs[0].pseudoflavor
3805                                         = svcauth_gss_flavor(exp->ex_client);
3806                 } else {
3807                         nflavs = 1;
3808                         flavs[0].pseudoflavor
3809                                         = exp->ex_client->flavour->flavour;
3810                 }
3811         }
3812 
3813         supported = 0;
3814         p = xdr_reserve_space(xdr, 4);
3815         if (!p)
3816                 return nfserr_resource;
3817         flavorsp = p++;         /* to be backfilled later */
3818 
3819         for (i = 0; i < nflavs; i++) {
3820                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3821                 struct rpcsec_gss_info info;
3822 
3823                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3824                         supported++;
3825                         p = xdr_reserve_space(xdr, 4 + 4 +
3826                                               XDR_LEN(info.oid.len) + 4 + 4);
3827                         if (!p)
3828                                 return nfserr_resource;
3829                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
3830                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
3831                         *p++ = cpu_to_be32(info.qop);
3832                         *p++ = cpu_to_be32(info.service);
3833                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3834                         supported++;
3835                         p = xdr_reserve_space(xdr, 4);
3836                         if (!p)
3837                                 return nfserr_resource;
3838                         *p++ = cpu_to_be32(pf);
3839                 } else {
3840                         if (report)
3841                                 pr_warn("NFS: SECINFO: security flavor %u "
3842                                         "is not supported\n", pf);
3843                 }
3844         }
3845 
3846         if (nflavs != supported)
3847                 report = false;
3848         *flavorsp = htonl(supported);
3849         return 0;
3850 }
3851 
3852 static __be32
3853 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3854                      struct nfsd4_secinfo *secinfo)
3855 {
3856         struct xdr_stream *xdr = &resp->xdr;
3857 
3858         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3859 }
3860 
3861 static __be32
3862 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3863                      struct nfsd4_secinfo_no_name *secinfo)
3864 {
3865         struct xdr_stream *xdr = &resp->xdr;
3866 
3867         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3868 }
3869 
3870 /*
3871  * The SETATTR encode routine is special -- it always encodes a bitmap,
3872  * regardless of the error status.
3873  */
3874 static __be32
3875 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3876 {
3877         struct xdr_stream *xdr = &resp->xdr;
3878         __be32 *p;
3879 
3880         p = xdr_reserve_space(xdr, 16);
3881         if (!p)
3882                 return nfserr_resource;
3883         if (nfserr) {
3884                 *p++ = cpu_to_be32(3);
3885                 *p++ = cpu_to_be32(0);
3886                 *p++ = cpu_to_be32(0);
3887                 *p++ = cpu_to_be32(0);
3888         }
3889         else {
3890                 *p++ = cpu_to_be32(3);
3891                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3892                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3893                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3894         }
3895         return nfserr;
3896 }
3897 
3898 static __be32
3899 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3900 {
3901         struct xdr_stream *xdr = &resp->xdr;
3902         __be32 *p;
3903 
3904         if (!nfserr) {
3905                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3906                 if (!p)
3907                         return nfserr_resource;
3908                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3909                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3910                                                 NFS4_VERIFIER_SIZE);
3911         }
3912         else if (nfserr == nfserr_clid_inuse) {
3913                 p = xdr_reserve_space(xdr, 8);
3914                 if (!p)
3915                         return nfserr_resource;
3916                 *p++ = cpu_to_be32(0);
3917                 *p++ = cpu_to_be32(0);
3918         }
3919         return nfserr;
3920 }
3921 
3922 static __be32
3923 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3924 {
3925         struct xdr_stream *xdr = &resp->xdr;
3926         __be32 *p;
3927 
3928         p = xdr_reserve_space(xdr, 16);
3929         if (!p)
3930                 return nfserr_resource;
3931         *p++ = cpu_to_be32(write->wr_bytes_written);
3932         *p++ = cpu_to_be32(write->wr_how_written);
3933         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3934                                                 NFS4_VERIFIER_SIZE);
3935         return 0;
3936 }
3937 
3938 static __be32
3939 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3940                          struct nfsd4_exchange_id *exid)
3941 {
3942         struct xdr_stream *xdr = &resp->xdr;
3943         __be32 *p;
3944         char *major_id;
3945         char *server_scope;
3946         int major_id_sz;
3947         int server_scope_sz;
3948         uint64_t minor_id = 0;
3949 
3950         major_id = utsname()->nodename;
3951         major_id_sz = strlen(major_id);
3952         server_scope = utsname()->nodename;
3953         server_scope_sz = strlen(server_scope);
3954 
3955         p = xdr_reserve_space(xdr,
3956                 8 /* eir_clientid */ +
3957                 4 /* eir_sequenceid */ +
3958                 4 /* eir_flags */ +
3959                 4 /* spr_how */);
3960         if (!p)
3961                 return nfserr_resource;
3962 
3963         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3964         *p++ = cpu_to_be32(exid->seqid);
3965         *p++ = cpu_to_be32(exid->flags);
3966 
3967         *p++ = cpu_to_be32(exid->spa_how);
3968 
3969         switch (exid->spa_how) {
3970         case SP4_NONE:
3971                 break;
3972         case SP4_MACH_CRED:
3973                 /* spo_must_enforce bitmap: */
3974                 nfserr = nfsd4_encode_bitmap(xdr,
3975                                         exid->spo_must_enforce[0],
3976                                         exid->spo_must_enforce[1],
3977                                         exid->spo_must_enforce[2]);
3978                 if (nfserr)
3979                         return nfserr;
3980                 /* spo_must_allow bitmap: */
3981                 nfserr = nfsd4_encode_bitmap(xdr,
3982                                         exid->spo_must_allow[0],
3983                                         exid->spo_must_allow[1],
3984                                         exid->spo_must_allow[2]);
3985                 if (nfserr)
3986                         return nfserr;
3987                 break;
3988         default:
3989                 WARN_ON_ONCE(1);
3990         }
3991 
3992         p = xdr_reserve_space(xdr,
3993                 8 /* so_minor_id */ +
3994                 4 /* so_major_id.len */ +
3995                 (XDR_QUADLEN(major_id_sz) * 4) +
3996                 4 /* eir_server_scope.len */ +
3997                 (XDR_QUADLEN(server_scope_sz) * 4) +
3998                 4 /* eir_server_impl_id.count (0) */);
3999         if (!p)
4000                 return nfserr_resource;
4001 
4002         /* The server_owner struct */
4003         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4004         /* major id */
4005         p = xdr_encode_opaque(p, major_id, major_id_sz);
4006 
4007         /* Server scope */
4008         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4009 
4010         /* Implementation id */
4011         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4012         return 0;
4013 }
4014 
4015 static __be32
4016 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4017                             struct nfsd4_create_session *sess)
4018 {
4019         struct xdr_stream *xdr = &resp->xdr;
4020         __be32 *p;
4021 
4022         p = xdr_reserve_space(xdr, 24);
4023         if (!p)
4024                 return nfserr_resource;
4025         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4026                                         NFS4_MAX_SESSIONID_LEN);
4027         *p++ = cpu_to_be32(sess->seqid);
4028         *p++ = cpu_to_be32(sess->flags);
4029 
4030         p = xdr_reserve_space(xdr, 28);
4031         if (!p)
4032                 return nfserr_resource;
4033         *p++ = cpu_to_be32(0); /* headerpadsz */
4034         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4035         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4036         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4037         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4038         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4039         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4040 
4041         if (sess->fore_channel.nr_rdma_attrs) {
4042                 p = xdr_reserve_space(xdr, 4);
4043                 if (!p)
4044                         return nfserr_resource;
4045                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4046         }
4047 
4048         p = xdr_reserve_space(xdr, 28);
4049         if (!p)
4050                 return nfserr_resource;
4051         *p++ = cpu_to_be32(0); /* headerpadsz */
4052         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4053         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4054         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4055         *p++ = cpu_to_be32(sess->back_channel.maxops);
4056         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4057         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4058 
4059         if (sess->back_channel.nr_rdma_attrs) {
4060                 p = xdr_reserve_space(xdr, 4);
4061                 if (!p)
4062                         return nfserr_resource;
4063                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4064         }
4065         return 0;
4066 }
4067 
4068 static __be32
4069 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4070                       struct nfsd4_sequence *seq)
4071 {
4072         struct xdr_stream *xdr = &resp->xdr;
4073         __be32 *p;
4074 
4075         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4076         if (!p)
4077                 return nfserr_resource;
4078         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4079                                         NFS4_MAX_SESSIONID_LEN);
4080         *p++ = cpu_to_be32(seq->seqid);
4081         *p++ = cpu_to_be32(seq->slotid);
4082         /* Note slotid's are numbered from zero: */
4083         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4084         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4085         *p++ = cpu_to_be32(seq->status_flags);
4086 
4087         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4088         return 0;
4089 }
4090 
4091 static __be32
4092 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4093                           struct nfsd4_test_stateid *test_stateid)
4094 {
4095         struct xdr_stream *xdr = &resp->xdr;
4096         struct nfsd4_test_stateid_id *stateid, *next;
4097         __be32 *p;
4098 
4099         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4100         if (!p)
4101                 return nfserr_resource;
4102         *p++ = htonl(test_stateid->ts_num_ids);
4103 
4104         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4105                 *p++ = stateid->ts_id_status;
4106         }
4107 
4108         return 0;
4109 }
4110 
4111 #ifdef CONFIG_NFSD_PNFS
4112 static __be32
4113 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4114                 struct nfsd4_getdeviceinfo *gdev)
4115 {
4116         struct xdr_stream *xdr = &resp->xdr;
4117         const struct nfsd4_layout_ops *ops;
4118         u32 starting_len = xdr->buf->len, needed_len;
4119         __be32 *p;
4120 
4121         p = xdr_reserve_space(xdr, 4);
4122         if (!p)
4123                 return nfserr_resource;
4124 
4125         *p++ = cpu_to_be32(gdev->gd_layout_type);
4126 
4127         /* If maxcount is 0 then just update notifications */
4128         if (gdev->gd_maxcount != 0) {
4129                 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4130                 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4131                 if (nfserr) {
4132                         /*
4133                          * We don't bother to burden the layout drivers with
4134                          * enforcing gd_maxcount, just tell the client to
4135                          * come back with a bigger buffer if it's not enough.
4136                          */
4137                         if (xdr->buf->len + 4 > gdev->gd_maxcount)
4138                                 goto toosmall;
4139                         return nfserr;
4140                 }
4141         }
4142 
4143         if (gdev->gd_notify_types) {
4144                 p = xdr_reserve_space(xdr, 4 + 4);
4145                 if (!p)
4146                         return nfserr_resource;
4147                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4148                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4149         } else {
4150                 p = xdr_reserve_space(xdr, 4);
4151                 if (!p)
4152                         return nfserr_resource;
4153                 *p++ = 0;
4154         }
4155 
4156         return 0;
4157 toosmall:
4158         dprintk("%s: maxcount too small\n", __func__);
4159         needed_len = xdr->buf->len + 4 /* notifications */;
4160         xdr_truncate_encode(xdr, starting_len);
4161         p = xdr_reserve_space(xdr, 4);
4162         if (!p)
4163                 return nfserr_resource;
4164         *p++ = cpu_to_be32(needed_len);
4165         return nfserr_toosmall;
4166 }
4167 
4168 static __be32
4169 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4170                 struct nfsd4_layoutget *lgp)
4171 {
4172         struct xdr_stream *xdr = &resp->xdr;
4173         const struct nfsd4_layout_ops *ops;
4174         __be32 *p;
4175 
4176         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4177         if (!p)
4178                 return nfserr_resource;
4179 
4180         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4181         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4182         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4183                                     sizeof(stateid_opaque_t));
4184 
4185         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4186         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4187         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4188         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4189         *p++ = cpu_to_be32(lgp->lg_layout_type);
4190 
4191         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4192         return ops->encode_layoutget(xdr, lgp);
4193 }
4194 
4195 static __be32
4196 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4197                           struct nfsd4_layoutcommit *lcp)
4198 {
4199         struct xdr_stream *xdr = &resp->xdr;
4200         __be32 *p;
4201 
4202         p = xdr_reserve_space(xdr, 4);
4203         if (!p)
4204                 return nfserr_resource;
4205         *p++ = cpu_to_be32(lcp->lc_size_chg);
4206         if (lcp->lc_size_chg) {
4207                 p = xdr_reserve_space(xdr, 8);
4208                 if (!p)
4209                         return nfserr_resource;
4210                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4211         }
4212 
4213         return 0;
4214 }
4215 
4216 static __be32
4217 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4218                 struct nfsd4_layoutreturn *lrp)
4219 {
4220         struct xdr_stream *xdr = &resp->xdr;
4221         __be32 *p;
4222 
4223         p = xdr_reserve_space(xdr, 4);
4224         if (!p)
4225                 return nfserr_resource;
4226         *p++ = cpu_to_be32(lrp->lrs_present);
4227         if (lrp->lrs_present)
4228                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4229         return 0;
4230 }
4231 #endif /* CONFIG_NFSD_PNFS */
4232 
4233 static __be32
4234 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4235                 struct nfsd42_write_res *write, bool sync)
4236 {
4237         __be32 *p;
4238         p = xdr_reserve_space(&resp->xdr, 4);
4239         if (!p)
4240                 return nfserr_resource;
4241 
4242         if (sync)
4243                 *p++ = cpu_to_be32(0);
4244         else {
4245                 __be32 nfserr;
4246                 *p++ = cpu_to_be32(1);
4247                 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4248                 if (nfserr)
4249                         return nfserr;
4250         }
4251         p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4252         if (!p)
4253                 return nfserr_resource;
4254 
4255         p = xdr_encode_hyper(p, write->wr_bytes_written);
4256         *p++ = cpu_to_be32(write->wr_stable_how);
4257         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4258                                     NFS4_VERIFIER_SIZE);
4259         return nfs_ok;
4260 }
4261 
4262 static __be32
4263 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4264                   struct nfsd4_copy *copy)
4265 {
4266         __be32 *p;
4267 
4268         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4269                         copy->cp_synchronous);
4270         if (nfserr)
4271                 return nfserr;
4272 
4273         p = xdr_reserve_space(&resp->xdr, 4 + 4);
4274         *p++ = xdr_one; /* cr_consecutive */
4275         *p++ = cpu_to_be32(copy->cp_synchronous);
4276         return 0;
4277 }
4278 
4279 static __be32
4280 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4281                             struct nfsd4_offload_status *os)
4282 {
4283         struct xdr_stream *xdr = &resp->xdr;
4284         __be32 *p;
4285 
4286         p = xdr_reserve_space(xdr, 8 + 4);
4287         if (!p)
4288                 return nfserr_resource;
4289         p = xdr_encode_hyper(p, os->count);
4290         *p++ = cpu_to_be32(0);
4291 
4292         return nfserr;
4293 }
4294 
4295 static __be32
4296 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4297                   struct nfsd4_seek *seek)
4298 {
4299         __be32 *p;
4300 
4301         p = xdr_reserve_space(&resp->xdr, 4 + 8);
4302         *p++ = cpu_to_be32(seek->seek_eof);
4303         p = xdr_encode_hyper(p, seek->seek_pos);
4304 
4305         return 0;
4306 }
4307 
4308 static __be32
4309 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4310 {
4311         return nfserr;
4312 }
4313 
4314 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4315 
4316 /*
4317  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4318  * since we don't need to filter out obsolete ops as this is
4319  * done in the decoding phase.
4320  */
4321 static const nfsd4_enc nfsd4_enc_ops[] = {
4322         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
4323         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
4324         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
4325         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
4326         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
4327         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
4328         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
4329         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
4330         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
4331         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
4332         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
4333         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
4334         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
4335         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
4336         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
4337         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
4338         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
4339         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
4340         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
4341         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
4342         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
4343         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
4344         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
4345         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
4346         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
4347         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
4348         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
4349         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
4350         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
4351         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
4352         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
4353         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
4354         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
4355         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4356         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
4357         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
4358         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
4359 
4360         /* NFSv4.1 operations */
4361         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
4362         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4363         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
4364         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
4365         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_noop,
4366         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
4367         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4368 #ifdef CONFIG_NFSD_PNFS
4369         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4370         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4371         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_layoutcommit,
4372         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_layoutget,
4373         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_layoutreturn,
4374 #else
4375         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
4376         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
4377         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
4378         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
4379         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
4380 #endif
4381         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4382         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
4383         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
4384         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
4385         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
4386         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
4387         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
4388 
4389         /* NFSv4.2 operations */
4390         [OP_ALLOCATE]           = (nfsd4_enc)nfsd4_encode_noop,
4391         [OP_COPY]               = (nfsd4_enc)nfsd4_encode_copy,
4392         [OP_COPY_NOTIFY]        = (nfsd4_enc)nfsd4_encode_noop,
4393         [OP_DEALLOCATE]         = (nfsd4_enc)nfsd4_encode_noop,
4394         [OP_IO_ADVISE]          = (nfsd4_enc)nfsd4_encode_noop,
4395         [OP_LAYOUTERROR]        = (nfsd4_enc)nfsd4_encode_noop,
4396         [OP_LAYOUTSTATS]        = (nfsd4_enc)nfsd4_encode_noop,
4397         [OP_OFFLOAD_CANCEL]     = (nfsd4_enc)nfsd4_encode_noop,
4398         [OP_OFFLOAD_STATUS]     = (nfsd4_enc)nfsd4_encode_offload_status,
4399         [OP_READ_PLUS]          = (nfsd4_enc)nfsd4_encode_noop,
4400         [OP_SEEK]               = (nfsd4_enc)nfsd4_encode_seek,
4401         [OP_WRITE_SAME]         = (nfsd4_enc)nfsd4_encode_noop,
4402         [OP_CLONE]              = (nfsd4_enc)nfsd4_encode_noop,
4403 };
4404 
4405 /*
4406  * Calculate whether we still have space to encode repsize bytes.
4407  * There are two considerations:
4408  *     - For NFS versions >=4.1, the size of the reply must stay within
4409  *       session limits
4410  *     - For all NFS versions, we must stay within limited preallocated
4411  *       buffer space.
4412  *
4413  * This is called before the operation is processed, so can only provide
4414  * an upper estimate.  For some nonidempotent operations (such as
4415  * getattr), it's not necessarily a problem if that estimate is wrong,
4416  * as we can fail it after processing without significant side effects.
4417  */
4418 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4419 {
4420         struct xdr_buf *buf = &resp->rqstp->rq_res;
4421         struct nfsd4_slot *slot = resp->cstate.slot;
4422 
4423         if (buf->len + respsize <= buf->buflen)
4424                 return nfs_ok;
4425         if (!nfsd4_has_session(&resp->cstate))
4426                 return nfserr_resource;
4427         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4428                 WARN_ON_ONCE(1);
4429                 return nfserr_rep_too_big_to_cache;
4430         }
4431         return nfserr_rep_too_big;
4432 }
4433 
4434 void
4435 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4436 {
4437         struct xdr_stream *xdr = &resp->xdr;
4438         struct nfs4_stateowner *so = resp->cstate.replay_owner;
4439         struct svc_rqst *rqstp = resp->rqstp;
4440         const struct nfsd4_operation *opdesc = op->opdesc;
4441         int post_err_offset;
4442         nfsd4_enc encoder;
4443         __be32 *p;
4444 
4445         p = xdr_reserve_space(xdr, 8);
4446         if (!p) {
4447                 WARN_ON_ONCE(1);
4448                 return;
4449         }
4450         *p++ = cpu_to_be32(op->opnum);
4451         post_err_offset = xdr->buf->len;
4452 
4453         if (op->opnum == OP_ILLEGAL)
4454                 goto status;
4455         if (op->status && opdesc &&
4456                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4457                 goto status;
4458         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4459                !nfsd4_enc_ops[op->opnum]);
4460         encoder = nfsd4_enc_ops[op->opnum];
4461         op->status = encoder(resp, op->status, &op->u);
4462         if (opdesc && opdesc->op_release)
4463                 opdesc->op_release(&op->u);
4464         xdr_commit_encode(xdr);
4465 
4466         /* nfsd4_check_resp_size guarantees enough room for error status */
4467         if (!op->status) {
4468                 int space_needed = 0;
4469                 if (!nfsd4_last_compound_op(rqstp))
4470                         space_needed = COMPOUND_ERR_SLACK_SPACE;
4471                 op->status = nfsd4_check_resp_size(resp, space_needed);
4472         }
4473         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4474                 struct nfsd4_slot *slot = resp->cstate.slot;
4475 
4476                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4477                         op->status = nfserr_rep_too_big_to_cache;
4478                 else
4479                         op->status = nfserr_rep_too_big;
4480         }
4481         if (op->status == nfserr_resource ||
4482             op->status == nfserr_rep_too_big ||
4483             op->status == nfserr_rep_too_big_to_cache) {
4484                 /*
4485                  * The operation may have already been encoded or
4486                  * partially encoded.  No op returns anything additional
4487                  * in the case of one of these three errors, so we can
4488                  * just truncate back to after the status.  But it's a
4489                  * bug if we had to do this on a non-idempotent op:
4490                  */
4491                 warn_on_nonidempotent_op(op);
4492                 xdr_truncate_encode(xdr, post_err_offset);
4493         }
4494         if (so) {
4495                 int len = xdr->buf->len - post_err_offset;
4496 
4497                 so->so_replay.rp_status = op->status;
4498                 so->so_replay.rp_buflen = len;
4499                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4500                                                 so->so_replay.rp_buf, len);
4501         }
4502 status:
4503         /* Note that op->status is already in network byte order: */
4504         write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4505 }
4506 
4507 /* 
4508  * Encode the reply stored in the stateowner reply cache 
4509  * 
4510  * XDR note: do not encode rp->rp_buflen: the buffer contains the
4511  * previously sent already encoded operation.
4512  */
4513 void
4514 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4515 {
4516         __be32 *p;
4517         struct nfs4_replay *rp = op->replay;
4518 
4519         BUG_ON(!rp);
4520 
4521         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4522         if (!p) {
4523                 WARN_ON_ONCE(1);
4524                 return;
4525         }
4526         *p++ = cpu_to_be32(op->opnum);
4527         *p++ = rp->rp_status;  /* already xdr'ed */
4528 
4529         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4530 }
4531 
4532 int
4533 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4534 {
4535         return xdr_ressize_check(rqstp, p);
4536 }
4537 
4538 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4539 {
4540         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4541 
4542         if (args->ops != args->iops) {
4543                 kfree(args->ops);
4544                 args->ops = args->iops;
4545         }
4546         kfree(args->tmpp);
4547         args->tmpp = NULL;
4548         while (args->to_free) {
4549                 struct svcxdr_tmpbuf *tb = args->to_free;
4550                 args->to_free = tb->next;
4551                 kfree(tb);
4552         }
4553 }
4554 
4555 int
4556 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4557 {
4558         struct nfsd4_compoundargs *args = rqstp->rq_argp;
4559 
4560         if (rqstp->rq_arg.head[0].iov_len % 4) {
4561                 /* client is nuts */
4562                 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4563                         __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4564                 return 0;
4565         }
4566         args->p = p;
4567         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4568         args->pagelist = rqstp->rq_arg.pages;
4569         args->pagelen = rqstp->rq_arg.page_len;
4570         args->tail = false;
4571         args->tmpp = NULL;
4572         args->to_free = NULL;
4573         args->ops = args->iops;
4574         args->rqstp = rqstp;
4575 
4576         return !nfsd4_decode_compound(args);
4577 }
4578 
4579 int
4580 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4581 {
4582         /*
4583          * All that remains is to write the tag and operation count...
4584          */
4585         struct nfsd4_compoundres *resp = rqstp->rq_resp;
4586         struct xdr_buf *buf = resp->xdr.buf;
4587 
4588         WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4589                                  buf->tail[0].iov_len);
4590 
4591         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4592 
4593         p = resp->tagp;
4594         *p++ = htonl(resp->taglen);
4595         memcpy(p, resp->tag, resp->taglen);
4596         p += XDR_QUADLEN(resp->taglen);
4597         *p++ = htonl(resp->opcnt);
4598 
4599         nfsd4_sequence_done(resp);
4600         return 1;
4601 }
4602 
4603 /*
4604  * Local variables:
4605  *  c-basic-offset: 8
4606  * End:
4607  */
4608 

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